CN101398663B - Needle position detection device and electronic equipment equipped with needle position detection device - Google Patents

Abstract

The present invention provides a hand position detection device capable of accurately and reliably detecting the rotational position of a second hand wheel. Equipped with: first to third light-transmitting hole portions (21, 28, 29) A detecting unit for detecting and judging the rotational positions of the second wheel (20), the minute wheel (25), and the hour wheel (27). The first light-transmitting hole portion (21) of the second hand wheel (20) has: a first circular hole (21a) at the reference position of the second hand wheel (20); The second and third elongated holes (21b, 21c) are arranged along the first and second light shielding parts (21d, 21e) at different intervals. The rotational position of the second hand wheel (20) is accurately and reliably detected by counting the non-detection state of the second light shielding portion (21e) by the detection portion.

Description

Needle position detection device and electronic equipment equipped with needle position detection device

technical field

The present invention relates to a hand position detection device for detecting the pointer running positions of hands such as a second hand, a minute hand, and an hour hand.

Background technique

Conventionally, there is known a needle position detection device for an analog timepiece disclosed in JP-A-2000-162336. In this hand position detecting device of an analog timepiece, a first drive system is provided for moving the second hand by a second hand wheel rotated by the rotation of the first drive motor; The second drive system that rotates the minute wheel and the hour wheel separately for the minute hand and the hour hand; and the second wheel, the minute wheel, and the hour wheel of the first and second drive systems rotate in a state of overlapping on the same axis , the first to third light transmission holes respectively provided on the second wheel, the minute wheel, and the hour wheel are optically detected by a light-emitting element and a light-receiving element. Judging the rotation positions of the second hand wheel, minute hand wheel, and hour hand wheel, thereby judging the pointer running positions of the second hand, minute hand, and hour hand.

In this case, the first drive system includes a fifth wheel that transmits the rotation of the first drive motor to the second wheel, and three photodetection holes are provided at intervals of 120 on the fifth wheel. In addition, the first light transmission hole portion of the second hand wheel has 11 light detection holes arranged at angular intervals of 30 degrees along the circumference and a light shielding hole portion provided at one point on the circumference where the 11 light detection holes are continuous. Thus, the first drive system is configured so that when the fifth wheel rotates so that a light detection hole corresponds to the detection part, the second hand wheel also rotates so that the light shielding part of the second hand wheel corresponds to the light detection hole of the fifth wheel, and then initially When the light detection hole of the second hand wheel corresponds to the light detection by the detection part, the second hand points to the hour.

In addition, as the other first light-transmitting hole portion of the second hand wheel of the first drive system, there are: a light shielding portion arranged at the reference position of the second hand wheel; For the notch hole; the light-transmitting hole part of a light detection hole arranged on the same line as the second hand wheel with respect to the light-shielding part and between the pair of notch holes. This first drive system is purchased as follows: when the fifth wheel rotates so that a light detection hole corresponds to the detection part, the second hand wheel also rotates and passes through a cutout hole so that the light shielding part of the second hand wheel corresponds to the light detection hole of the fifth wheel Then, when a part of the notch hole on the other side of the second hand wheel corresponds to the light detection by the detection part, the second hand points to the hour.

However, the first drive system of this existing needle position detection device is provided with three light detection holes at intervals of 120 because the rotation of the first drive motor is transmitted to the second hand wheel. When one light detection hole of the fifth wheel corresponds to the detection part, it is necessary to detect the rotational position of the second hand wheel. Therefore, when assembling the fifth wheel and the second hand wheel, it is necessary to perform alignment of the two, so there is a problem that the assembly work becomes complex issues.

In addition, in the former first drive system of the hand position detection device, the first light transmission hole portion of the second hand wheel is provided with 11 light detection holes arranged at angular intervals of 30 degrees along the circumference of the second hand wheel and arranged in the second hand wheel. Since one light-shielding hole portion on the circumference where the 11 photodetection holes are continuous is configured, the permissible amount of light transmitted through each of the 11 photodetection holes is small. Therefore, when the second wheel is rotated to perform position detection, if the second wheel is rotated at a high speed, the 11 photodetection holes may not be reliably detected, and there is a problem that the position detection speed during high-speed operation is limited.

In addition, in the latter first driving system, since it is equipped with: a light detection hole provided at the reference position of the second hand wheel; The structure of the pair of cutout holes increases the permissible amount of light transmitted through the pair of cutout holes, and can detect the position of the second hand wheel at high speed rotation. However, the light detection hole of the fifth wheel is configured to correspond to the detection part When passing through one notch hole of the second hand wheel so that the light-shielding portion of the second hand wheel corresponds to the light detection hole of the fifth wheel, and then a part of the other notch hole of the second hand wheel corresponds so that there is light detection through the detection portion, Since the second hand points to the hour, it is judged that the second hand points to the hour no matter which part of the other notch hole corresponds to the detection unit. Therefore, there is a problem that the rotational position of the second wheel cannot be accurately identified.

Contents of the invention

An object of the present invention is to provide a hand position detection device capable of accurately and reliably detecting the rotational position of a second hand wheel.

In order to achieve the above objects, the present invention includes the following components.

A hand position detection device according to one invention, comprising: a first drive system for rotating the second hand by a second hand wheel rotated by rotation of a first drive motor; a second drive system for the minute hand and the hour hand to rotate the minute hand and the hour hand respectively; A detection unit that detects whether the light emitted from the light-emitting unit passes through the first to third light-transmitting holes respectively provided on the wheels to determine the rotational positions of the second wheel, the minute wheel, and the hour wheel , characterized in that,

The first light transmission hole portion includes: a first light detection hole provided at a predetermined position of the second hand wheel; The second and third photodetection holes are arranged across the first and second light-shielding parts at different intervals.

According to the present invention, when the second hand wheel is rotated to detect the passing detection part, the undetected number of the passing detection part can be different between the first light shielding part and the second light shielding part located on both sides of the first light detection hole of the second hand wheel . Therefore, the rotational position of the second hand wheel can be accurately and reliably detected by counting the number of different non-detection passes through the detection unit.

For example, count the undetected number of the second light-shielding part from the third light detection hole on the opposite side to the second light detection hole of the second hand in the direction opposite to the second hand, and the counted number is preset After the given number, when the detection part detects the first light detection hole immediately after, it can be determined that the preset position of the second hand wheel coincides with the detection part. Accordingly, it is possible to accurately and reliably detect the rotational position of the second wheel.

A needle position detection device related to another invention, having:

It has a reference hole provided at a predetermined position, first and second light-shielding parts provided on both sides of the reference hole with different lengths, and second, second and second light-shielding parts provided through these first and second light-shielding parts. The second hand wheel formed by the third long holes;

a minute wheel arranged on the same shaft as the second wheel and having a second light-transmitting hole;

an hour wheel disposed on the same axis as the second wheel and the minute wheel and having a third light-transmitting hole;

A light transmission hole detection unit that detects whether the light emitted from the light emitting unit has passed through each of the first to third light transmission holes to determine the rotational positions of the second wheel, the minute wheel, and the hour wheel, wherein, the detection section has a light emitting unit; and

The presence or absence of light detection is performed by the light transmission hole detection unit while rotating the second hand wheel in a preset rotation angle unit, and in the light non-detection state in which the light detection by the light transmission hole detection unit is judged When the number of consecutive times reaches a preset number of times, and thereafter, when it is judged that the second hand wheel is further rotated by a preset rotation angle unit, the light transmission hole detection unit detects the light emitted from the light emitting unit A second hand reference position detection unit that uses the position of the light detected by the light transmission hole portion detection unit as the reference position of the second hand wheel, that is, the position of the reference hole.

According to the present invention, when the second hand wheel rotates in a preset rotation angle unit, the number of consecutive times in the non-detection state in which light is not detected by the light transmission hole portion detection unit by the second hand predetermined position detection unit is the preset number of times. Afterwards, the position of the reference hole of the second hand wheel is detected by the light transmission hole detection unit, which can be judged as the preset position of the second hand wheel. Accordingly, it is possible to accurately and reliably detect the rotational position of the second wheel.

Description of drawings

FIG. 1 is a plan view showing a clock module in one embodiment of an analog wristwatch to which this invention is applied.

Fig. 2 is an enlarged perspective view showing a main part of the timepiece module of Fig. 1 .

3A and 3B are an enlarged plan view and a schematic view, respectively, of main parts of the timepiece movement of FIG. 2 viewed from the back cover side.

Fig. 4 is an enlarged cross-sectional view showing a main part of Fig. 2 .

FIG. 5 is an enlarged top view of the second wheel, the minute wheel, and the hour wheel of FIG. 3 disassembled.

6 is a table showing the number of teeth of each gear, each rotation angle per pulse, each pulse number per rotation, and the presence or absence of photodetection holes in the first drive system and the second drive system of FIG. 2 .

Fig. 7 is an enlarged plan view showing the seconds wheel of Fig. 5 .

FIG. 8 is a diagram showing a detection pattern of the second wheel in FIG. 7 by the detection unit.

Fig. 9 is an enlarged plan view showing the hour wheel of Fig. 5 .

10A to 10M are diagrams showing the basic position detection operation of the seconds wheel in FIG. 7 , and each state when the seconds wheel is rotated from the detection position P by 2 steps (12°).

11A to 11P show basic position detection operations of the minute wheel, hour wheel, and intermediate wheel in FIG. Figure 11N is a diagram of the states of the hour wheel and the intermediate wheel; Figure 11N is a diagram of the states of the minute wheel, the hour wheel, and the intermediate wheel when the minute wheel has been rotated 360 steps (equivalent to one hour) from the state of Figure 11M; Figure 11O It is a diagram of each state of the minute wheel, hour wheel, and intermediate wheel when the minute wheel is rotated for nine hours from the state of Figure 11N; Diagrams of the states of the minute wheel, hour wheel, and intermediate wheel on the "11:00 position".

12A to 12F are diagrams showing only the position detection operation of the seconds wheel in FIG. 5 and each state when the reference position of the seconds wheel shifted from the detection position P is moved to the detection position P. FIGS.

13A to 13F are diagrams showing the position detection operation of the minute wheel and the hour wheel in FIG.

14A to 14F show the position detection operation when the reference positions of the second wheel, minute wheel, and hour wheel in FIG. Figures of each state when the reference position moves to the detection position P.

15A to 15F show the needle position confirmation operation for confirming whether the positions of the second hand, the minute hand, and the hour hand are accurate at every hour when the normal hands are running, and show the movement of the second hand wheel, the minute hand wheel, and the hour hand wheel every two seconds. Diagram of each action state.

FIG. 16 is a block diagram showing the circuit configuration of the wristwatch of this embodiment.

FIG. 17 is a diagram showing an operation flow of a basic second hand position detection process for moving the reference position of the second hand to the detection position P. FIG.

FIG. 18 is a diagram showing a basic hour and minute hand position detection process operation flow for moving the reference positions of the minute hand and the hour hand to the detection position P. FIG.

19 is a diagram showing an operation flow of the second hand position detection process in the basic three-hand position detection process of moving the reference positions of the second hand, the minute hand, and the hour hand to the detection position P.

FIG. 20 is a diagram showing an operation flow of the minute hand position detection process in the basic three-hand position detection process of moving the reference positions of the second hand, minute hand, and hour hand to the detection position P. FIG.

21 is a diagram showing an operation flow of an hour hand position detection process in a basic three-hand position detection process of moving the reference positions of the second hand, the minute hand, and the hour hand to the detection position P.

FIG. 22 is a diagram showing an operation flow of a hand position checking process for checking the positions of the second hand, the minute hand, and the hour hand for every full hour during normal hand movement.

FIG. 23 is an enlarged plan view showing the movement amount of the second light transmission hole portion of the minute wheel with respect to the detection position of the detection unit every time the minute wheel of FIG. 5 rotates by one step (1°).

Fig. 24 is an enlarged plan view showing a first modification of the second wheel of the embodiment.

FIG. 25 is an enlarged plan view showing a second modification example of the second wheel of the embodiment.

Detailed ways

Next, an embodiment of an analog wristwatch to which this invention is applied will be described with reference to FIGS. 1 to 23 .

This analog wristwatch includes a timepiece module 1 shown in FIGS. 1 and 2 . The timepiece module 1 is used to indicate the time by rotating the second hand 2 , the minute hand 3 , and the hour hand 4 above the dial 5 , and is disposed in the watch case TK. A watch glass G is attached to the upper portion of the watch case TK, and a back cover UB is attached to the lower portion of the watch case TK.

As shown in FIG. 2 , the timepiece module 1 is configured to include an upper case 6 and a lower case 7 , and a timepiece movement 8 is provided therebetween. The dial 5 is provided on the upper surface of the upper case 6 with the solar cell panel 9 interposed therebetween. In addition, a circuit board 10 is provided on the inner surface of the lower case 7 .

As shown in FIGS. 2 to 4 , the clock movement device 8 has: a first drive system 11 for operating the second hand 2; a second drive system 12 for operating the minute hand 3 and the hour hand 4; The detection part 13 of the hand movement position of the hour hand 4.

The first and second drive systems 11 and 12 are arranged between the upper case 6 and the lower case 7 in a state of being mounted on the bottom plate 14 , the gear row support plate 15 , and the intermediate support plate 16 .

As shown in FIGS. 2 to 4 , the first drive system 11 has a first stepping motor 17; a fifth wheel 18 rotated by the first stepping motor 17; a fourth wheel rotated by the fifth wheel 18, namely the second hand. round 20. The second hand 2 is attached to the second hand shaft 20a of the second hand wheel 20 (see FIG. 4 ).

As shown in FIG. 2 , the first stepping motor 17 includes: a coil assembly 17a; a stator 17b; and a rotor 17c. The configuration is such that when the coil assembly 17a is energized, a magnetic field is generated, and the rotor 17c rotates in steps of 180 degrees at a time.

As shown in FIGS. 2 and 3 , the fifth wheel 18 rotates by meshing with the rotor pinion 17d of the rotor 17c of the first stepping motor 17 . The second wheel 20 rotates by meshing with the pinion 18 a of the fifth wheel 18 . A second shaft 20 a is provided at the center of the second wheel 20 . As shown in FIG. 2 , the second hand shaft 20 a protrudes upward through the respective through holes 5 a of the upper case 6 , the solar cell panel 9 , and the dial 5 . As shown in FIG. 4, the second hand 2 is attached to the protruding front end. As shown in FIGS. 5 and 7 , the second wheel 20 is provided with a first light transmission hole portion 21 which will be described later.

On the other hand, as shown in FIGS. 2 to 5 , the second drive system 12 includes a second stepping motor 22; an intermediate wheel 23 rotated by the second stepping motor 22; a third wheel rotated by the intermediate wheel 23; 24; the second wheel rotated by the third wheel 24 is the minute wheel 25; the minutewheel minutewheel26 rotated by the minute wheel 25; The minute hand 3 is mounted on a minute shaft 25 a of the minute wheel 25 . The hour hand 4 is mounted on an hour shaft 27 a of the hour wheel 27 .

As shown in FIG. 2 , the second stepping motor 22 includes a coil assembly 22a, a stator 22b, and a rotor 22c. The configuration is such that when the coil unit 22a is energized, a magnetic field is generated, and the rotor 22c is rotated in steps of 180 degrees at a time.

As shown in FIGS. 2 and 3 , the intermediate wheel 23 rotates while meshing with the c-rotor pinion 22d of the rotor 22 of the second stepping motor 22 . As shown in FIG. 5 , the intermediate wheel 23 is provided with a fourth light transmission hole 30 which will be described later. The third wheel 24 rotates by meshing with the pinion 23 a of the intermediate wheel 23 , and the minute wheel 25 rotates by meshing with the pinion 24 a of the third wheel 24 .

As shown in FIGS. 2 and 4 , at the center of the minute wheel 25 is provided a cylindrical minute shaft 25 a into which the second shaft 20 a of the second wheel 20 is rotatably inserted and protrudes upward. As shown in FIG. 2 , the minute hand shaft 25 a protrudes upward through the respective through holes 5 a of the upper case 6 , the solar cell panel 9 , and the dial 5 . As shown in FIG. 4, the minute hand 3 is attached to the protruding front end. As a result, the minute wheel 25 is arranged coaxially with the second wheel 20 in a state of being superimposed on the upper side of the second wheel 20 . In addition, as shown in FIG. 5 , a second light transmission hole portion 28 to be described later is provided on the minute wheel 25 .

As shown in FIG. 2 , the span wheel 26 is engaged with the minute shaft 25 a of the minute wheel 25 to rotate. The hour wheel 27 rotates by meshing with the pinion 26 a of the idler wheel 26 . At the center of the hour wheel 27 is provided a cylindrical hour shaft 27 a into which the minute shaft 25 a of the minute wheel 25 is rotatably inserted and which protrudes upward. As shown in FIG. 2 , the hour hand shaft 27 a protrudes upward through the respective through holes 5 a of the upper case 6 , the solar cell panel 9 , and the dial 5 . The hour hand 4 is attached to this protruding front end as shown in FIG. 4 . Thereby, the hour wheel 27 is arranged on the same axis as the second wheel 20 and the minute wheel 25 in a state of overlapping on the upper side of the minute wheel 25 . In addition, as shown in FIG. 5 , the hour wheel 27 is provided with a third light transmission hole portion 29 which will be described later.

As shown in the table of Fig. 6, set the number of teeth of each gear in the first and second drive systems 11, 12, the rotation angle of each gear of one pulse, the number of pulses required for one rotation of each gear, and the first ~ Presence or absence of the fourth light transmission hole portions 21 , 28 - 30 .

That is, the rotor pinion 17d of the rotor 17c of the first driving system 11 rotates (1 step) 180 degrees with one pulse (hereinafter referred to as the rotation of the angle "°"), and the fifth wheel 18 rotates with one pulse (1 step of the rotor 17c). ) rotated 36°. The fourth car, that is, the second hand wheel 20, rotates 6° (1 step of the rotor 17c) due to one pulse, and therefore rotates once with 60 pulses (60 steps of the rotor 17c).

The rotor pinion 22d of the rotor 22c of the second drive system 12 rotates 180° with one pulse (1 step), and the intermediate wheel 23 rotates 30° with one pulse (1 step of the rotor 22c), thereby rotating with twelve pulses (rotor 22c). 12 steps of 22c) make one revolution. The third wheel 24 rotates 4° with one pulse (1 step of the rotor 22c), and the minute wheel 25, that is, the second wheel, rotates 1° with one pulse (1 step of the rotor 22c), so it rotates with 360 pulses (1 step of the rotor 22c). The three hundred and sixty steps) make a full circle. The span wheel 26 rotates 1/3° with a pulse (1 step of the rotor 22c), and the cover wheel, that is, the needle wheel 27, rotates 1/12° with a pulse (1 step of the rotor 22c), so it rotates with 4320 pulses (1 step of the rotor 22c). 4320 steps) to rotate a circle.

As shown in FIG. 2, the detection unit 13 has a light emitting element 31 composed of an LED (light emitting diode) and a light receiving element 32 composed of a phototransistor respectively provided on the upper case 6 and the circuit board 10, and is configured to pass through the second hand. One of the light transmission holes 21a, 21b, 21c of the wheel 20, the second light transmission hole 28 of the minute wheel 25, one of the light transmission holes 30 of the hour wheel 27, and one of the light transmission holes 30 of the intermediate wheel 23. When all coincide with or partially overlap with the optical channel between the light emitting element 31 and the light receiving element 32, that is, the detection position P (in this embodiment, the detection position P is set at the position of 0:00:00), the light receiving element 32 receives The respective rotational positions of the second wheel 20 , the minute wheel 25 , and the hour wheel 27 are detected by the light from the light emitting element 31 passing through these translucent parts. As the detection position P, other positions such as 11:55 may be set.

As shown in FIG. 7, the first light-transmitting hole portion 21 of the second hand wheel 20 includes: a first circular hole 21a disposed at the reference position (00 second position) of the second hand wheel 20; 2, the second and third long holes 21b, 21c provided by the first and second light-shielding parts 21d, 21e at different intervals on both sides of the pointer running direction side and the opposite direction side; The shaped hole 21a is located at the third light-shielding portion 21f between the second and third long holes 21b and 21c on the diameter of the second hand wheel 20 .

As shown in FIG. 7 and FIG. 23, since the diameter of the second hand wheel 20 is about 3 to 4 mm, the first circular hole 21a is formed to be about 0.4 to 0.5 mm (width of about 12° with respect to the circumference of the second hand wheel 20). the size of. In addition, as shown in FIG. 7, the second elongated hole 21b in the second and third elongated holes 21b, 21c is based on the center of the first circular hole 21a (0°), from approximately 48° position ( 8 seconds position) to the maximum 168° position (28 seconds position) is set in an arc shape corresponding to the rotational movement locus of the first circular hole 21a. As shown in FIG. 7, with the center of the first circular hole 21a as a reference (0°), the range from approximately 192° position (32 second position) to a large 300° position (50 second position) is set to be the same as The rotation trajectory of the first circular hole 21a corresponds to an arc shape.

Among the first and second light shielding portions 21d and 21e, the first light shielding portion 21d located on the counterclockwise direction side (left-handed side in FIG. 7 ) of the second hand 2, as shown in FIG. The diameter (12° width) of 21a is about three times the interval, that is, in the range from the reference position (0° position) as the center of the first circular hole 21a to the maximum 48° position (8 seconds position), They are provided at intervals with a width of substantially about 36°.

In addition, the second light-shielding portion 21e located on the opposite side (right-handed side in FIG. 7 ) of the second hand 2 is located at an interval longer than that of the first light-shielding portion 21d, corresponding to about one first circular hole 21a. interval setting. This interval is an interval of about four times the diameter of the first circular hole 21a, and is rotated rightward from the reference position (0° position) as the center of the first circular hole 21a to a maximum of 60° position (50 seconds). The range of position) is set at intervals of a width of approximately 48°. In addition, as shown in FIG. 7 , the third light-shielding portion 21f is located on the diameter of the second hand wheel 20 relative to the first circular hole 21a, and is disposed between the second and third elongated holes 21b and 21c. The width of the third light shielding portion 21f is formed substantially the same as the width in the radial direction of the first circular hole 21a. In the description of this specification, when the rotation directions of the second wheel 20, the minute wheel 25, and the hour wheel 27 are not clearly indicated, as shown by the arrows in FIGS. The center rotates clockwise. In addition, the direction of rotation of the intermediate wheel 23 is set to rotate counterclockwise around the axis.

The first light shielding portion 21 d corresponds to a part of the third elongated hole 21 c located on the diameter of the second wheel 20 . The second light shielding portion 21 e corresponds to a part of the second elongated hole 21 b located on the diameter of the seconds wheel 20 . The third shade 21 f corresponds to a part of the first circular hole 21 a located on the diameter of the second wheel 20 . Thus, the second hand wheel 20 is configured so that when any one of the first to third light shielding parts 21d to 21f corresponds to the detection position P of the detection part 13 (the light emitting element 31 and the light receiving element 32), when it is rotated by 180° (rotation half), then any one of the first circular hole 21a, the second and third elongated holes 21b, 21c must correspond to the detection position P of the detection part 13.

The second hand wheel 20 rotates 2 steps at a time (rotation angle is 12°), and during the rotation of 60 steps (rotation angle is 360°, rotation time is 60 seconds), when the detection unit 13 detects every two seconds, it becomes as follows: The detection pattern by the detection part 13 shown in FIG.

That is, when the second hand wheel 20 is at the 0-second position (0° position), the detection unit 13 detects the first circular hole 21a, and when it is at the 2-second position (12° position) to the 6-second position (36° position), it detects the first circular hole 21a. The non-detection state in which the portion 13 is blocked by the first light shielding portion 21d and the light detection by the detection portion 13 cannot be performed three times in succession.

The detection section 13 continuously detects the second elongated hole 21b when the seconds wheel 20 is at the 8-second position (48° position) to the 28-second position (168° position). When it is at the 30-second position (180° position), the detection unit 13 is blocked by the third light shielding unit 21f, and it becomes a non-detection state in which light detection by the detection unit 13 cannot be performed. The detecting unit 13 continuously detects the third elongated hole 21c from the 32-second position (192° position) to the 50-second position (300° position). From the 52-second position (312° position) to the 58-second position (348° position), the detection unit 13 is blocked by the second light shielding unit 21e, and the non-detection state in which light detection by the detection unit 13 cannot be performed is continued four times. .

As shown by the solid line in FIG. 5 , the second light-transmitting hole portion 28 of the minute wheel 25 is a light detection hole (hereinafter referred to as a circular hole) arranged at the reference position of the minute wheel 25 (00 minute position: 0° position). ). The circular hole of the second translucent hole portion 28 is also substantially the same size as the first circular hole 21 a of the second wheel 20 , and is provided at a position corresponding to the first circular hole 21 a of the second wheel 20 .

As shown in FIGS. 5 and 9 , the third light-transmitting hole 29 of the hour wheel 27 is a photodetector set at an angular interval of 30° along the circumference from the reference position of the hour wheel 27 (00 o'clock position: 0° position). holes (hereinafter referred to as circular holes). A fourth light shielding portion 29 a is provided at an 11 o'clock position (1 o'clock position in FIG. 9 ) between the circular hole located at the reference position and the eleventh circular hole.

As shown in FIG. 9, regarding the third light transmission hole 29 of the hour hand wheel 27, when the 0 o'clock position is set as the reference position (0° position), at 0°, 30°, 60°, 90°, 120° °, 150 °, 180 °, 210 °, 240 °, 270 °, each position of 300 °, that is, the direction of rotation of the pointer along the hour hand 4 (reverse rotation in Fig. 9) is 0 o'clock, 1 o'clock, 2 o'clock, There are circular holes at 3 o'clock, 4 o'clock, 5 o'clock, 6 o'clock, 7 o'clock, 8 o'clock, 9 o'clock, and 10 o'clock, respectively, at 11 o'clock at 330° (1 o'clock in Figure 9) A fourth light shielding portion 29a is provided. Each of the circular holes serving as the third light transmission hole portion 29 of the hour wheel 27 is also formed to have substantially the same size as the first circular hole 21 a of the second wheel 20 .

In addition, as shown in FIG. 5 , the fourth light-transmitting hole portion 30 of the intermediate wheel 23 is a circular hole corresponding to a circular hole of the second light-transmitting hole portion 28 of the minute wheel 25 , so as to correspond to the second light-transmitting hole portion 28 of the second wheel 20 . The first circular hole 21 a and the circular hole serving as the second light-transmitting hole portion 28 of the minute wheel 25 are formed to have approximately the same size. The fourth light transmission hole portion 30 is provided at a preset position of the intermediate wheel 23, that is, when the second light transmission hole portion 28 of the minute hand wheel 25 corresponds to the detection position P of the detection unit 13, it corresponds to the second light transmission hole portion of the minute hand wheel 25. The position of the aperture portion 28 .

In the case of this embodiment, light detection is performed at every full hour of the hour hand 4, that is, 0 o'clock, 1 o'clock, 2 o'clock, 3 o'clock, 4 o'clock, 5 o'clock, 6 o'clock, 7 o'clock, 8 o'clock, 9 o'clock, and 10 o'clock. , 11 o'clock, and its rotation angle of the intermediate wheel 23, the minute hand wheel 25, and the hour hand wheel 27 of the second driving system 12 is 30 °, 1 °, 1/12 ° with 1 step (half rotation of the rotor 22c), so as As shown in FIG. 5 , all of the second to fourth light transmission hole portions 28 to 30 overlap at the detection position P of the detection unit 13 on the hour of the hour hand 4 except for the 11 o'clock position.

In addition, the rotation angle of the second wheel 20 of the first driving system 11 is 6° in one step (half rotation of the rotor 17c). Since the second hand wheel 20 corresponds to the detection position P of the detection part 13 every 60 steps (60 seconds) of the first circular hole 21a of the first light-transmitting hole part 21, it is thus configured as shown in FIG. Every hour (except 11 o'clock), the first circular hole 21 a of the first light transmission hole portion 21 overlaps with the second to fourth light transmission hole portions 28 to 30 .

Here, detection of the positions of the second hand 2 , the minute hand 3 , and the hour hand 4 by the detection unit 13 is performed as follows. That is, when the second hand 2, the minute hand 3, and the hour hand 4 overlap each other at a position on the 12 o'clock side (a position on the upper side in FIG. 5), the first to third light transmission hole portions 21, 28, 29 and the intermediate wheel 23 and the fourth light transmission hole portion 30 overlap at the detection position P. At this time, the light from the light emitting element 31 passes through the first to fourth light transmission hole portions 21 , 28 to 30 and is received by the light receiving element 32 .

On the other hand, when any one of the first to fourth light transmission hole portions 21, 28 to 30 does not correspond to the detection position P, the light from the light emitting element 31 is blocked, so the light receiving element 32 cannot receive light, and the detection portion 13 is in an undetected state.

In addition, the first and second stepping motors 17, 22 each rotate the second hand 2, the minute hand 3, and the hour hand 4 by one step by reversing the directions of the rotors 17c, 22c by 180°. Therefore, by alternately applying pulses with different polarities to the first and second stepping motors 17 and 22 every one step, it becomes an operation to rotate the respective rotors 17c and 22c. Therefore, even if the same kind of pulses are continuously applied to the first and second stepping motors 17 and 22 every step, the rotors 17c and 22c will not rotate and will stop immediately.

As far as the second hand wheel 20 is concerned, from the relationship between the size of the first circular hole 21a of the first light-transmitting hole portion 21 and the amount of movement of one step, if it does not rotate for two steps, the first circular hole 21a is incomplete. Since it is away from the detection position P of the detection part 13, detection is performed in 2 steps (2 seconds) at a time.

For this, the intermediate wheel 23 , the minute wheel 25 , and the hour wheel 27 of the second drive system 12 are detected one step at a time.

Next, a basic second hand position detection operation for detecting the reference position (00 second position) of the second hand wheel 20 will be described with reference to FIGS. 10A to 10M .

In this basic second hand position detection operation, the minute wheel 25 , the hour wheel 27 , and the intermediate wheel 23 of the second drive system 12 are ignored. In addition, FIGS. 10A to 10M show the correspondence relationship between the rotation position of the seconds wheel 20 and the detection position P of the detection unit 13 when the seconds wheel 20 rotates 2 steps (rotation angle: 12°).

The detection of the reference position of the seconds wheel 20 is accomplished by detecting the reference position (00 seconds position) of the seconds wheel 20 shown in FIG. 10A.

That is, the position where the first circular hole 21 a of the first light transmission hole portion 21 of the second hand wheel 20 coincides with the detection position P of the detection unit 13 is detected. The state of the reference position of the second hand wheel 20 is the state of FIG. 10A, and the first circular hole 21a of the first light-transmitting hole portion 21 of the second hand wheel 20 is consistent with the detection position P of the detection part 13, and it is possible to pass through the detection part. 13 states of light detection.

First, in the state of FIG. 10A, if the second hand wheel 20 rotates 2 steps and the rotation angle becomes 12°, as shown in FIG. 10B, the first circular hole 21a deviates from the detection position P by clockwise rotation, so that a part of the first light shielding portion 21d Corresponding to the detection position P, the light detection by the detection part 13 cannot be performed, and it is in the undetected state shown at the 2-second position in FIG. 8 . Similarly, as shown in FIGS. 10C to 10D , until the second hand wheel 20 is rotated by two steps each time and the rotation angle becomes 36°, a part of the first light shielding portion 21d corresponds to the detection position P, so the detection portion 13 cannot be passed. As shown in the position of 3 seconds to 6 seconds in FIG. 8 , the non-detection state is successively three times.

Thereafter, as shown in FIG. 10E , when the second hand wheel 20 rotates two steps and the rotation angle becomes 48°, the second elongated hole 21b of the first light transmission hole portion 21 of the second hand wheel 20 corresponds to the detection position P of the detection unit 13, Therefore, as shown at the 8-second position in FIG. 8 , light detection by the detection unit 13 can be performed. Similarly, as shown in FIG. 10F, until the second hand wheel 20 is rotated by 2 steps each time so that the rotation angle becomes 168°, a part of the second elongated hole 21b corresponds to the detection position P of the detection part 13, so as shown in 10 of FIG. As indicated by the positions from seconds to 28 seconds, light detection by the detection unit 13 can be continuously performed.

In this state, as shown in FIG. 10G , if the second hand wheel 20 is further rotated by 2 steps and the rotation angle becomes 180°, the second elongated hole 21b is clockwise deviated from the detection position P, so that the third light shielding portion 21f corresponds to the detection position P. , so light detection by the detection unit 13 cannot be performed, and as shown at the 30-second position in FIG. 8 , it is in a non-detection state. Thereafter, as shown in FIG. 10H , when the second hand wheel 20 rotates two steps and the rotation angle becomes 192°, a part of the third elongated hole 21c of the first light transmission hole portion 21 of the second hand wheel 20 and the detection position P of the detection unit 13 Correspondingly, as shown at the 32 second position in FIG. 8 , it is in a state where light detection by the detection unit 13 can be performed.

Thereafter, as shown in FIG. 10I , until the second hand wheel 20 is rotated by 2 steps at a time so that the rotation angle becomes 300°, a part of the third elongated hole 21c corresponds to the detection position P of the detection part 13, so 34 seconds as in FIG. 8 As indicated by the position of ~50 seconds, light detection by the detection unit 13 can be continuously performed. As shown in FIG. 10J , if the third long hole 21c deviates from the detection position P by right-hand rotation, and a part of the second light-shielding portion 21e corresponds to the detection position P, the light detection by the detection portion 13 cannot be performed, so as shown in 52 of FIG. 8 Indicated in the second position, it is in an undetected state.

Similarly, as shown in FIGS. 10K to 10M , until the second hand wheel 20 is rotated by 2 steps at a time so that the rotation angle becomes 348°, a part of the second light shielding portion 21e corresponds to the detection position P, so it is impossible to pass the detection portion 13. As shown in the position of 54 seconds to 58 seconds in FIG. 8 , the non-detection state continues four times. In this state, as shown in FIG. 10A, if the second hand wheel 20 rotates 2 steps and the rotation angle becomes 360°, the first circular hole 21a corresponds to the detection position P of the detection part 13, as indicated by the 0 second position in FIG. , it is in a state where light detection by the detection unit 13 can be performed.

Thus, the state of FIG. 10A is a state where light detection by the detection unit 13 is possible, and the states of FIGS. 10B to 10D are states where light detection by the detection unit 13 cannot be performed three consecutive times. The states in FIGS. 10E to 10F are states in which light detection by the detection unit 13 can be continuously performed, and the state in FIG. 10G is a state in which light detection by the detection unit 13 cannot be performed. The states in FIGS. 10H to 10I are states in which light detection by the detection unit 13 can be continuously performed, and the states in FIGS. 10J to 10M are states in which light detection by the detection unit 13 cannot be performed four consecutive times.

Here, the non-detected state in which light detection cannot be continuously performed is the state of FIGS. The former has three consecutive undetected states, and the latter has four consecutive undetected states, and the number of consecutive undetected times is different between the former and the latter. The reference position of the seconds wheel 20 can be specified by counting the number of non-detection states in which light detection cannot be continuously performed.

Second hand wheel 20 detects by 2 steps (2 seconds) at a time. When the light detection of the seconds wheel 20 is carried out in two steps (2 seconds) each time, the next light detection can be performed after four consecutive non-detection states, the position becomes the reference position (00 second position). If, from the state of FIG. 10A, when the non-detection state is counted, the non-detection state continues three times until the state of FIG. 10D, after that, the state of FIG. 10E can be detected by the detection unit 13, so , cannot meet the condition of four consecutive undetected states, so it is not the reference position. This is the basic position detection operation for detecting the reference position of the seconds wheel 20 .

Next, the basic hour and minute hand position detection operation for detecting the respective reference positions of the minute hand wheel 25 and the hour hand wheel 27 will be described with reference to FIGS. 11A to 11P .

In this basic hour hand position detection operation, the minute and second hand wheel 20 of the first drive system 11 is ignored. In addition, FIGS. 11A to 11M show a state in which the minute wheel 25 rotates one step (1°) each time to make the intermediate wheel 23 rotate once. The state that wheel 27 has rotated 30°, Fig. 11N ~ Fig. 11O represent the state that hour hand wheel 27 has rotated from the state of Fig. Further rotated the state equivalent to 1 hour (accumulated equivalent to 11 hours).

The reference positions (00 seconds position) of both the minute wheel 25 and the hour wheel 27 can be most easily detected when they are in the state shown in FIG. 11A . Since the reference position of the second light transmission hole portion 28 of the minute hand wheel 25 is (00 second position), the reference position of one of the third light transmission hole portions 29 of the 11 hour hand wheel 27 is Yes (0 second position), therefore, these reference positions and the position where all the fourth light transmission hole portions 30 of the intermediate wheel 23 coincide with the detection position P of the detection unit 13 are detected.

First, in the state of FIG. 11A, if the minute wheel 25 is rotated by 1 step (1°), as shown in FIG. 11B , the intermediate wheel 23 rotates 30°, and the fourth light-transmitting hole portion 30 of the intermediate wheel 23 leaves the detection position. P, the detection position P of the detection part 13 blocked by the intermediate wheel 23 . At this time, the minute wheel 25 is rotated clockwise by 1° so that the second light transmission hole portion 28 is slightly shifted from the detection position P of the detection unit 13 , thereby being positioned at a position where light passing through the detection unit 13 can be detected.

In this state, if the minute wheel 25 rotates 1 step each time and rotates 6 steps (6°) accumulatively, as shown in FIG. The detection position P is 180°, so that the detection part 13 continues to block the detection position P. At this time, the minute hand wheel 25 rotates clockwise by 6° so that the second light transmission hole portion 28 deviates roughly halfway from the detection position P of the deviation detection portion 13, and is still located at a position where light detection by the detection portion 13 can be performed (see FIG. twenty three).

Thereafter, if the minute wheel 25 rotates 12 steps (12°) by 1 step at a time, the intermediate wheel 23 rotates 360° as shown in FIG. At this time, the second light transmission hole portion 28 of the minute hand wheel 25 is almost completely away from the detection position P, and the second light transmission hole portion 28 is in a state of not overlapping with the detection position P, and the minute hand wheel 25 blocks the detection position P, so that The state of light detection by the detection unit 13 . In addition, at this time, the hour hand wheel 27 only rotates 1°, so the third light-transmitting hole portion 29 of the hour hand wheel 27, that is, the circular hole at the reference position, only slightly deviates from the detection position P, so that light detection by the detection unit 13 can be performed. status.

If the minute wheel 25 rotates 360 steps (one turn) from the state of A in FIG. 11, then as shown in FIG. It is in the state corresponding to the detection position P. At this time, the hour hand wheel 27 rotates 30° from the state of A in FIG. 11 , the third light-transmitting hole portion 29 , that is, the circular hole at the reference position, leaves the detection position P, and the third light-transmitting hole portion 29 is located on the left side of the reference position. The second circular hole corresponds to the detection position P, so that it is in a state where light detection by the detection part 13 can be performed. In this state, if the minute wheel 25 rotates for 9 hours (accumulatively equivalent to 10 hours), then as shown in FIG. The light hole part 30 corresponds to the detection position P, the hour hand wheel 27 rotates 300°, and the third light transmission hole part 29, that is, the eleventh circular hole from the reference position, corresponds to the detection position P, so that it is in a passable detection part. 13 states of light detection.

Thereafter, if the minute wheel 25 is further rotated for 1 hour (accumulatively equivalent to 11 hours), then as shown in FIG. The portion 30 corresponds to the detection position P, the hour hand wheel 27 rotates 330°, the third light-transmitting hole portion 29 leaves the detection position P from the eleventh circular hole at the reference position, the fourth light shielding portion 29a of the hour hand wheel 27 and The detection position P corresponds to. Therefore, it is in a state where light detection by the detection unit 13 cannot be performed. The state may be specified as "position at 11:00".

If the minute wheel 25 is further rotated for 1 hour (accumulatively equivalent to 12 hours), then as shown in FIG. Corresponding to the detection position P, and the hour hand wheel 27 rotates 360°, the fourth light transmission hole portion 29a of the hour hand wheel 27 is away from the detection position P, and the third light transmission hole portion 29 in each third light transmission hole portion 29 is located at the reference position (0 o’clock position). The three light-transmitting hole portions 29 correspond to the detection position P, so that the hour hand wheel 27 returns to the state of FIG. 11A (0:00 position).

In this way, since the rotation amount of one step of the minute wheel 25 is very small, the second light transmission hole 28 cannot completely move away from the detection position P by the rotation amount of one step of the minute wheel 25, so that the minute hand cannot be accurately detected. However, since the intermediate wheel 23 rotates 30° in one step, even if the amount of rotation of the minute wheel 25 in one step is small, because the amount of rotation of the intermediate wheel 23 is large, the intermediate wheel 23 can be used. Wheel 23 to block the detection position P.

In addition, as shown in FIG. 11M, if the intermediate wheel 23 rotates once in 12 steps, the minute wheel 25 rotates 12°, so that the circular hole of the second light-transmitting hole portion 28 of the minute wheel 25 is completely away from the detection position P, so , the minute wheel 25 blocks the detection position P. At this time, even if the fourth light transmission hole portion 30 of the intermediate wheel 23 coincides with the detection position P, light detection by the detection portion 13 cannot be performed.

In addition, when the minute hand wheel 25 rotates once by 360 steps so that its reference position returns to the detection position P, the second light transmission hole portion 28 of the minute hand wheel 25, the fourth light transmission hole portion 30 of the intermediate wheel 23, and Any one of the third light-transmitting hole portions 29 of the hour wheel 27 (except the fourth light-shielding portion 29a at the 11 o'clock position) corresponds to the detection position P, thereby being independent of the rotational position of the hour wheel 27 (except the 11 o'clock position). It is in a state where light detection by the detection unit 13 is possible.

Furthermore, after detecting the reference position (0° position) of the minute wheel 25, if the minute wheel 25 is rotated 360 steps (one circle) at a time, since the hour wheel 27 is rotated at 30° each time, even if it is not The minute wheel 25 performs light detection by the detection unit 13 every step, and the rotational position of the hour wheel 27 can be detected by performing light detection by the detection unit 13 only when the minute wheel 25 is rotated once. At this time, when the light detection by the detection part 13 is tested by rotating the minute wheel 25 every time 360 steps from the state shown in FIG. 11O, as shown in FIG. When they match, although optical detection cannot be performed, the position of the hour hand wheel 27 at this time can be identified as "the 11:00 position".

If the minute hand wheel 25 is further rotated by 360° from the "11:00 position" where light detection by the detection unit 13 cannot be performed, the third light transmission hole portion 29 of the hour hand wheel 27, that is, the reference position (0 o'clock position) The circular hole of the corresponding to the detection position P, so that the detection of light through the detection part 13 can be performed. That is, the reference position of the hour hand wheel 27 is set at the detection position P (0:00 position). Thus, the light detection by the detection part 13 is tested every time the minute hand wheel 25 rotates 360° (one turn) from the state where the light detection by the detection part 13 can be performed. The position of light detection (the state of FIG. 11P ) further rotates the minute hand wheel 25 by 360° to find the rotational position of the hour hand wheel 27 (the state of FIG. 11A ) capable of light detection by the detection part 13, then the position can be specified as The reference position of the hour hand wheel 27, that is, the "0:00 position".

Next, a basic three-hand position detection operation for detecting the positions of the second hand 2 , the minute hand 3 , and the hour hand 4 will be described with reference to FIGS. 12A to 12F .

The three-hand position detection operation includes: the second hand position detection operation performed when the first light transmission hole portion 21 of the second hand wheel 20 deviates from the detection position P; The hour and minute hand position detection operation performed when any one of the third light transmission hole parts 29 deviates from the detection position P; and the first light transmission hole part 21 of the second hand wheel 20 and the second light transmission hole part 28 of the minute hand wheel 25 3. Three operations combining the second hand position detection operation and the hour and minute hand position detection operation performed when all the third light transmission hole portions 29 of the hour hand wheel 27 deviate from the detection position P.

First, the three-hand position detection operation when only the first light transmission hole portion 21 of the second hand wheel 20 deviates from the detection position P will be described with reference to FIGS. 12A to 12F .

At this time, the state of the second wheel 20 is completely unknown, and it is assumed that the reference positions of the minute wheel 25 and the hour wheel 27 are at the detection position (0:00 position). Therefore, first, the basic second hand position detection operation for detecting the reference position of the second hand wheel 20 was tested. That is, the basic second hand position detection operation is to rotate the second hand wheel 20 every two steps as described above, and light detection by the detection unit 13 is performed every two steps.

At this time, when the light detection by the detection unit 13 is tested by rotating the seconds wheel 20 by two steps, the light detection by the detection unit 13 cannot be performed in the state shown in FIG. 12A . Here, the non-detection state in which light detection by the detection unit 13 cannot be performed is counted as "the number of times of non-detection". In the continuous occasion of this undetected state, add the number of times of non-detection sequentially, only in the case where light detection cannot be carried out continuously for each 2-step rotation of the second hand wheel 20, add the number of times of non-detection, and in the case where light detection can be carried out In this case, the number of non-detection times is cleared to zero.

If the light detection cannot be performed, the second wheel 20 is further rotated by 2 steps to test the light detection by the detection unit 13 . At this time, as shown in FIG. 12B , if light detection by the detection unit 13 cannot be performed, the non-detection state continues, and thus the non-detection count is added. In this state, when the second hand wheel 20 is further rotated by two steps to test the light detection by the detection part 13, as shown in FIG. The number of undetected times is cleared to zero.

Next, each 2-step test of the seconds wheel 20 is detected by the light of the detection unit 13 . At this time, as shown in FIG. 12D , when the previous state where light detection by the detection unit 13 was enabled becomes the state where light detection is not possible, the number of times of non-detection is counted again here. The light detection of the seconds wheel 20 is tested 2 steps at a time. At this time, as shown in FIG. 12E , the non-detection state in which light detection by the detection unit 13 cannot be performed is consecutive four times.

As shown in FIG. 12F , in the next two steps, if the light detection by the detection part 13 can be performed, the first circular hole 21a of the first light transmission hole part 21 of the second hand wheel 20 coincides with the detection position P of the detection part 13. , so it can be seen that this position is exactly the reference position (00 second position) of the second hand wheel 20. So far, the reference position of the seconds wheel 20 , that is, the "00 second position" has been detected.

Next, the three-hand position detection operation when the second light transmission hole 28 of the minute wheel 25 and the third light transmission hole 29 of the hour wheel 27 deviate from the detection position P will be described with reference to FIGS. 13A to 13F .

At this time, although the first light transmission hole portion 21 of the second hand wheel 20 corresponds to the detection position P of the detection unit 13, since the light transmission hole portions of the minute hand wheel 25 and the hour hand wheel 27 deviate from the detection position P, the passing detection cannot be performed. Section 13 for light detection. Therefore, first, the basic second hand position detection operation for moving the reference position of the second hand wheel 20 to the detection position P is tested.

At this time, the second hand wheel 20 is rotated 2 steps at a time, and when the light detection by the detection part 13 is tested for each 2 steps, the state of FIG. 13A is changed to the state of FIG. The portion 21 coincides with the detection position P, but since the second light transmission hole portion 28 of the minute wheel 25 and the third light transmission hole portion 29 of the hour wheel 27 deviate from the detection position P, light detection by the detection portion 13 cannot be performed. . At this time, when the second hand wheel 20 changes from the state of FIG. 13A to the state of FIG. 13B , the undetected state continues four times.

Here, according to the condition of the basic position detection operation of the second hand wheel 20, that is, "perform each 2-step optical detection of the second hand wheel 20, and after the non-detection state is consecutive for four times, when the optical detection can be performed next time, its position is taken as a reference." position” condition, if in the state of FIG. 13B , the non-detection state continues four times, and light detection can be performed in the next two steps, then the reference position of the second hand wheel 20 is at the detection position P, and even if the second hand wheel 20 is rotated Step 2, since the second light transmission hole 28 of the minute wheel 25 and the third light transmission hole 29 of the hour wheel 27 deviate from the detection position P as shown in FIG. detection.

Therefore, when the light detection by the detection part 13 cannot be carried out five consecutive times for every two steps of the second hand wheel 20, it can be known that the second light transmission hole part 28 of the minute hand wheel 25 and the third light transmission hole of the hour hand wheel 27 at this moment Either one of the portions 29 deviates from the detection position P. In addition, in this state, it is unclear whether the second hand wheel 20 is in a state where the first light transmission hole portion 21 coincides with the detection position P or not.

However, at this moment, since it is clear that any one of the second light transmission hole portion 28 of the minute wheel 25 and the third light transmission hole portion 29 of the hour wheel 27 deviates from the detection position P, the test for detecting the minute wheel 25 and the hour hand Basic hour and minute hand position detection operation of the reference position of the wheel 27. At this time, the minute wheel 25 is rotated one step at a time to test the light detection by the detection part 13. If the minute wheel 25 and the hour wheel 27 change from the state of FIG. 13C to the state of FIG. 13D, the second light transmission of the minute wheel 25 The hole 28 and the fourth light-transmitting hole 30 of the intermediate wheel 23 correspond to the detection position P, and any circular hole of the third light-transmission hole 29 of the hour hand wheel 27 also corresponds to the detection position P, so that passing Light detection by the detection unit 13 .

From this, it can be seen that the reference position (00 minute position) of the minute wheel 25 is at the detection position P. FIG. At this time, it is unclear where the second wheel 20 and the hour wheel 27 are. Then, since it is a state where light detection by the detection part 13 can be performed, first, the basic second hand position detection operation for detecting the reference position of the second hand wheel 20 is performed, and the reference position of the second hand wheel 20 is set to the position shown in FIG. 13E . The detection position P moves. It can be seen from this that the respective reference positions of the second wheel 20 and the minute wheel 25 are "00 minutes 00 seconds position".

Thereafter, if the minute wheel 25 is rotated by 360° (one turn), the third light transmission hole portion 29 of the hour wheel 27 corresponds to the detection position P for each 360°, and light detection by the detection portion 13 can be performed. The reference position (0 o'clock position) of the hour wheel 27 coincides with the detection position P when it is further rotated by 360° from the state (11 o'clock position) where light detection by the detection unit 13 cannot be performed. Thereby, all the reference positions of the second wheel 20, the minute wheel 25, and the hour wheel 27 are (0:00:00 position). This is generated at 00:00:00 PM.

Next, with reference to FIGS. 14A to 14F , all deviation detection positions P of the first light transmission hole portion 21 of the second hand wheel 20 , the second light transmission hole portion 28 of the minute hand wheel 25 , and the third light transmission hole portion 29 of the hour hand wheel 27 will be described. The three-needle position detection action of the occasion.

At this time, the rotational position of any one of the second wheel 20 , the minute wheel 25 , and the hour wheel 27 is unclear. Therefore, first, the basic second hand position detection operation for detecting the reference position of the second hand wheel 20 was tested. That is, in the state of FIG. 14A , the second hand wheel 20 is rotated two steps at a time to test the light detection by the detection unit 13 . At this time, as shown in FIG. 14B , although the first light transmission hole portion 21 of the second hand wheel 20 corresponds to the detection position P, if the second light transmission hole portion 28 of the minute hand wheel 25 and the third light transmission hole portion of the hour hand wheel 27 If the portion 29 does not correspond to the detection position P, light detection by the detection portion 13 cannot be performed.

Therefore, the basic second hand position detection operation of the second hand wheel 20 is further performed. Since the condition of this basic second hand position detection operation is to carry out the optical detection of the second hand wheel 20 every two steps, and after the non-detection state continues four times, when the optical detection can be performed next time, its position is the reference position, therefore, If, as shown in FIG. 14B , the non-detection state of the seconds wheel 20 continues four times, and the light detection by the detection part 13 can be performed in the next two steps, the reference position of the seconds wheel 20 is at the detection position P, and even if it is used When the second hand wheel 20 rotates 2 steps, and as shown in FIG. 14C, the light detection by the detection part 13 cannot be performed, it is judged that the second light transmission hole part 28 of the minute hand wheel 25 and the third light transmission hole part of the hour hand wheel 27 29 deviates from the detection position P. In addition, at this time, it is also not clear whether the first light transmission hole portion 21 corresponds to the detection position P with respect to the second hand wheel 20 .

In this state, it is judged that the second light transmission hole portion 28 of the minute wheel 25 deviates from the detection position P, and then the basic second hand position detection operation for detecting the reference positions of the minute wheel 25 and the hour wheel 27 is tested, and the minute wheel 25 When the light detection by the detection part 13 is tested by rotating one step at a time, as shown in FIG. It is suspected that the first light transmission hole portion 21 of the second hand wheel 20 does not correspond to the detection position P, and the second hand wheel 20 is rotated by 30 steps (180°).

That is, in the state where the first light transmission hole 21 of the second hand wheel 20 does not correspond to the detection position P, if the second hand wheel 20 is rotated 30 steps (180°), the first light transmission hole 21 must be at the detection position P. Accordingly, the first light transmission hole portion 21 of the virtual second wheel 20 does not correspond to the detection position P as shown in FIG. 14E . In this state, the minute wheel 25 is again rotated by one step to test the light detection by the detection unit 13 . At this time, when the second light transmission hole portion 28 of the minute wheel 25 corresponds to the detection position P and light detection by the detection unit 13 is possible, the reference position (00 minute position) of the minute wheel 25 is as shown in FIG. 14F . When the operations from the state of FIG. 14D to FIG. 14F and FIG. 14E are performed, all the reference positions of the second wheel 20 , the minute wheel 25 , and the hour wheel 27 coincide.

The basic hand position checking operation for checking whether the three hands of the second hand 2 , the minute hand 3 , and the hour hand 4 are correct at each hour during normal hand movement will be described with reference to FIGS. 15A to 15F .

Regarding this basic hand position confirmation operation, it is judged in the CPU 35 whether the three hands of the second hand 2, the minute hand 3, and the hour hand 4 are accurate at each hour, and in the case of the second hand 2, at the hour other than 11 o'clock and 23 o'clock, Click to confirm whether the second hand 2 is accurate. In this case, the deviation of the second hand 2 is confirmed within 10 seconds from the hour. That is, if 10 seconds have elapsed from the hour, the minute wheel 25 is rotated by the second stepping motor 22 of the second drive system 12 by 1 step (1°), and the intermediate wheel 23 is rotated by 30°, and is set in the middle. One hole portion 30 of the wheel 23 is blocked by the light shielding portion of the minute wheel 25 to block the detection position P of the detection portion 13, so that optical detection cannot be performed.

The state of FIG. 15A is the state of the full hour (for example, 2 o'clock) when the hands normally operate. All of the third light transmission hole 29 (for example, the third circular hole) of the hour hand wheel 27 and the fourth light transmission hole 30 of the intermediate wheel 23 are consistent with the detection position P of the detection part 13 . In this state, the normal pointer operation in which the second wheel 20 is rotated by 6° per second is performed. At this time, since the second hand wheel 20 only rotates 6° per second, the first circular hole 21a of the second hand wheel 20 is not completely away from the detection position P of the detection part 13, and is in a state where light detection by the detection part 13 can be performed. .

Thereafter, if the second hand wheel 20 is further rotated by 1 step to be located at the 2 second position rotated by 2 steps (12°), then as shown in FIG. P, the detection position P of the detection part 13 is blocked by the first light shielding part 21d. At this time, when the light detection by the detection unit 13 is tested, the light detection by the detection unit 13 cannot be performed as before, and the non-detection state is counted as the “number of times of non-detection”.

Further, the second hand wheel 20 rotates one step at a time, and the light detection by the detection unit 13 is tested every two steps. At this time, at the 4-second position shown in FIG. 15C and the 6-second position shown in FIG. 15D , the detection part 13 is continuously blocked by the first light shielding part 21d of the second hand wheel 20 . Thereby, as shown in FIGS. 15B to 15D , the undetected state in which light detection by the detection unit 13 cannot be performed continues three times.

In this state, the second hand wheel 20 is then rotated by 2 steps. As shown at the 8 second position in FIG. , the first circular hole 21a, which is the reference position of the second hand wheel 20, is located at the 8 second position. Therefore, the second hand wheel 20 rotates accurately, and the second hand 2 is at an accurate pointer running position. That is, the second hand 2 performs light detection by the detection part 13 when the second hand wheel 20 rotates 2 steps from the hour position every time, and after the non-detection state of the detection part 13 continues three times, the light detection by the detection part 13 can be performed next time. At the 8 second position, move the hands accurately.

Thereafter, the seconds wheel 20 is further rotated by 2 steps to become 10 seconds. Then, as shown in FIG. Since the minute wheel 25 rotates by 1 step (1°) and the intermediate wheel 23 rotates by 1 step (30°), even if the second light-transmitting hole portion 28 of the minute wheel 25 does not completely leave the detection position P of the detection part 13, the intermediate wheel 23 The fourth light transmission hole portion 30 is also completely away from the detection position P of the detection portion 13 , so that the intermediate wheel 23 blocks the detection portion 13 . Therefore, the pointer comparison during the pointer movement is usually carried out within 10 seconds from every hour.

Next, the circuit configuration of this analog wristwatch will be described with reference to the block diagram of FIG. 16 .

This circuit configuration has: a CPU (central processing unit) 35 that controls the entire circuit; a ROM (read-only memory) 36 that stores a predetermined program; a RAM 37 (random access memory) that stores processed data; An oscillating circuit 38 for operating pulses; a frequency dividing circuit 39 for converting pulses generated from the oscillating circuit 38 into an appropriate frequency (an appropriate frequency for operating the CPU 35); hour hands (second hand 2, minute hand 3, Hour hand 4) A clockwork mechanism 8 that moves; and a detection unit 13 having a light emitting element 31 that emits light and a light receiving element 32 that receives light from the light emitting element 31 .

Furthermore, this circuit configuration includes, in addition to the above-mentioned contents: a power supply unit 40 such as a solar battery panel 9 and a battery for supplying power; an antenna 41 for receiving standard time radio waves; and a detection circuit 42 for performing detection processing on the received standard time radio waves. The illumination part 43 that illuminates time display, the illumination driving circuit 44 that is used to drive this illumination part 43;

A basic second hand position detection process for detecting the reference position of the second hand 2 in this analog watch will be described with reference to FIG. 17 .

This basic second hand position detection process is to detect the reference position (00 second position) of the second hand wheel 20. As shown in FIG. The rotational position of the second hand wheel 20 when the detection position P of 13 coincides. In this case, it is assumed that the minute wheel 25 , the hour wheel 27 , and the second to third light transmission hole portions 28 to 30 of the intermediate wheel 23 of the second driving system 12 coincide with the detection position P of the detection unit 13 and stop.

When this second hand position detection process is started, the CPU 35 clears the number of non-detection times detected by the previous detection unit 13 to 0, and sets the non-detection flag to "0" (step S1). The CPU 35 drives the motors 11, 12 to rotate the second hand wheel 20 for 2 steps (12°) (step S2), and then makes the light emitting element 31 of the detection part 13 emit light (step S3), and then detects whether the light receiving element 32 has received the light. The light from the light-emitting element 31 is used to determine whether or not there is light detection by the detection unit 13 (step S4).

When any one of the first circular hole 21a, second and third elongated holes 21b, 21c of the first light-transmitting hole portion 21 of the second hand wheel 20 corresponds to the detection position P of the detection part 13, the CPU 35 passes the light receiving element 32 Receive light from the light-emitting element 31, determine that there is light detection by the detection part 13, and return to step S1 until any one of the first to third light shielding parts 21d-21f of the second hand wheel 20 is detected by the detection part 13. The above operation is repeated until the position P corresponds to and blocks the detection position P.

If the second hand wheel 20 rotates 2 steps each time, and each of the first circular hole 21a, the second and the third elongated holes 21b, 21c of the first light transmission hole portion 21 of the second hand wheel 20 deviates from the detection of the detection part 13 position P, any one of the first to third light shielding parts 21d to 21f of the second hand wheel 20 corresponds to the detection position P of the detection part 13, then as far as the CPU 35 is concerned, the light receiving element 32 cannot receive light from the light emitting element 31, and is in the Can not carry out the undetected state by the light detection of detection part 13, this undetected state counts with undetected number of times, and adds "1" to undetected sign (step S5), and judges whether this undetected state is successive four times (step S6).

That is, the reference position of the second hand wheel 20 is as shown in FIGS. 10J to 10M. After the undetected state has been in the non-detection state for four consecutive times, as shown in FIG. base position. Therefore, for example, from the state of FIG. 10B to the state of FIG. 10D , a part of the first light-shielding portion 21d of the second hand wheel 20 corresponds to the detection position P. Therefore, the non-detection times of the detection portion 13 pass three consecutive times, but if the second hand wheel 20 rotates 2 steps, a part of the second elongated hole 21b of the second hand wheel 20 corresponds to the detection position P, so that there is light detection by the detection part 13 . At this time, return to step S2, and repeat the above actions.

Similarly, in the state of FIG. 10G, since the third light-shielding portion 21f of the second hand wheel 20 corresponds to the detection position P of the detection unit 13, light detection by the detection unit 13 cannot be performed. If the second hand wheel 20 rotates two steps next, Then, a part of the third elongated hole 21c of the second hand wheel 20 corresponds to the detection position P, and the light detection by the detection unit 13 can be performed. Therefore, at this time also returns to step S2, and the above-mentioned operations are repeated.

When the second hand wheel 20 rotates from the state of FIG. 10J to the state of FIG. 10M , a part of the second light shielding portion 21e of the second hand wheel 20 corresponds to the detection position P sequentially, so the non-detection times of passing the detection portion 13 are consecutive four times.

CPU 35 rotates the second hand wheel 20 for 2 steps (step S7), and makes the light-emitting element 31 of the detection part 13 emit light (step S8), and detects whether the light-receiving element 32 has received the light of the light-emitting element 31, thereby judging whether there is a light passing through the detection part. 13 light detection (step S9). In this step S9, when there is light detection by the detection unit 13, the CPU 35 determines that the second wheel has been detected based on the coincidence of the first circular hole 21a of the first light transmission hole portion 21 of the second wheel 20 with the detection position P. 20 reference position (00 second position), and correct the hand position to return the second hand 2, minute hand 3, and hour hand 4 to the current time (step S10), and transfer to the normal pointer operation to end the process.

In this case, in step S9, it is assumed that the second to third light transmission hole portions 28 to 30 of the minute wheel 25, the hour wheel 27, and the intermediate wheel 23 coincide with the detection position P of the detection unit 13 and stop. There is light detection by the detection unit 13, and if the second to third light transmission hole portions 28-30 of the minute hand wheel 25, the hour hand wheel 27, and the intermediate wheel 23 do not correspond to the detection position P of the detection unit 13, Since there is no light detection by the detection unit 13, the process proceeds to the sub-position detection process described later.

Next, basic hour and minute hand position detection processing for detecting the reference positions of the minute hand 3 and the hour hand 4 in this analog watch will be described with reference to FIG. 18 .

In this minute hand position detection process, as shown in FIG. 11A , the second light transmission hole portion 28 of the minute hand wheel 25 and the third light transmission hole portion 29 of the hour hand wheel 27, that is, the circular hole at the reference position (0 o'clock position) and the intermediate wheel are detected. The reference position (00 minute position) of the minute wheel 25 and the hour wheel 27 when all of the fourth light transmission hole portions 30 at 23 coincide with the detection position P of the detection unit 13 . In this case, it is assumed that the first light transmission hole portion 21 of the second hand wheel 20 of the first driving system 11 coincides with the detection position P of the detection unit 13 and stops.

If the second hand position detection process is started, the minute hand wheel 25 is rotated by 1 step (1°) (step S15), and the light emitting element 31 of the detection part 13 is made to emit light (step S16), and whether the light is received by the light receiving element 32 is detected. The light from the element 31 is used to judge whether or not there is light detection by the detection unit 13 (step S17). If the light is not detected by the detection unit 13, the operations from step S15 to step S17 are repeated until the minute wheel 25 rotates 360° (corresponding to one hour for one rotation). In this case, since it is assumed that the first light transmission hole portion 21 of the second hand wheel 20 coincides with the detection position P of the detection unit 13, if the minute hand wheel 25 rotates 360 degrees, as shown in FIG. Except for the 11 o'clock position", there must be light detection by the detection unit 13 .

From this, it is specified that the reference position (00 minute position) of the minute hand wheel 25 coincides with the detection position P when light detection by the detection unit 13 occurs in step S17. Further, the minute wheel 25 is rotated by 360°, the hour wheel 27 is rotated by 30° (step S18), and the light-emitting element 31 of the detection part 13 is made to emit light (step S19), by detecting whether the light-receiving element 32 has received the light-emitting element 31 Therefore, it is judged whether the third light transmission hole portion 29 of the hour hand wheel 27 corresponds to the detection position P of the detection portion 13 and thus the light detection by the detection portion 13 is performed (step S20).

At this time, since the circular holes of the third light-transmitting hole portion 29 of the hour hand wheel 27 are provided with 11 at intervals of 30°, and the fourth light shielding portion 29a is provided at the "11 o'clock position", if the minute hand wheel 25 rotates 360° ° and rotate the hour hand wheel 27 by 30°, as shown in Figures 11N to 11O, except for the fourth light-shielding part 29a at the "11 o'clock position", the circular holes of the third light-transmitting hole part 29 and the detection position P The order corresponds so that there is light detection by the detection section 13 . In this step S20, when there is light detection by the detection unit 13, return to step S18, and after each circular hole of the third light-transmitting hole portion 29 of the hour wheel 27 corresponds to the detection position P in sequence, until the hour wheel 27 The above operation is repeated until the fourth light shielding portion 29a of 27 corresponds to the detection position P and light detection by the detection portion 13 cannot be performed.

As shown in FIG. 11P, if the light detection by the detection part 13 cannot be performed because the fourth light-shielding part 29a of the hour hand wheel 27 corresponds to the detection position P, it is determined that the hour hand wheel 27 is at "11 o'clock position", and the minute hand wheel 25 is further rotated 360° to rotate the hour hand wheel 27 by 30° (step S21), and the light emitting element 31 of the detection part 13 is made to emit light (step S22), and whether the light receiving element 32 has received the light of the light emitting element 31 is detected to determine whether There is light detection by the detection part 13 (step S23).

In this step S23, as shown in FIG. 11A, the third light transmission hole portion 29 of the "0 o'clock position" of the hour hand wheel 27 must correspond to the detection position P of the detection part 13, and there is light detection by the detection part 13, so After confirming that the "0 o'clock position" of the hour hand wheel 27 is consistent with the detection position P, the processing flow ends. In addition, in step S23, since it is assumed that the first light transmission hole portion 21 of the second hand wheel 20 corresponds to the detection position P of the detection portion 13, there must be light detection by the detection portion 13, and if there is no wide detection, then When it is determined that the first light transmission hole portion 21 of the second hand wheel 20 does not correspond to the detection position P, the process returns to the second hand position detection process described above.

Next, basic three-hand position detection processing for detecting the three-hand reference positions of the second hand 2 , the minute hand 3 , and the hour hand 4 in this analog watch will be described with reference to FIGS. 19 to 21 .

In this three-hand position detection process, when the positions of all three hands of the second hand 2 , the minute hand 3 , and the hour hand 4 are unclear, a process combining the above-mentioned second hand position detection process and hour and minute hand position detection process is performed. In this case, FIG. 19 shows steps S30 to S38 in the second hand position detection process, FIG. 20 shows steps S41 to S66 in the minute hand position detection process, and FIG. 21 shows steps S70 to S77 in the hour hand position detection process.

When this three-hand position detection process is activated, the CPU 35 does not know the positions of all three hands of the second hand 2 , the minute hand 3 , and the hour hand 4 , and therefore first executes the second hand position detection process of FIG. 19 . That is, clear the non-detection number of times of the non-detection state detected by the detection unit 13 until the previous time, and make the non-detection flag bit "0" (step S30), and make the second hand wheel 20 rotate 2 steps ( Step S31), make the light-emitting element 31 of the detection part 13 emit light (step S32), by detecting whether the light-receiving element 32 receives the light of the light-emitting element 31, thereby judging whether there is light detection by the detection part 13 (step S33).

At this time, although all the rotational positions of the second hand wheel 20, the minute hand wheel 25, and the hour hand wheel 27 are not clear, when the light receiving element 32 receives light from the light emitting element 31 and light detection by the detection part 13 occurs, return to Step S30 , until any one of the first to third light shielding parts 21d to 21f of the second hand wheel 20 corresponds to the detection position P of the detection part 13 and blocks the detection position P, the above operation is repeated.

That is, when there is light detection by the detection unit 13 in step S33, the first light transmission hole 21 of the second hand wheel 20, the second light transmission hole 28 of the minute hand wheel 25, and the third light transmission hole of the hour hand wheel 27 All of the portion 29 and the fourth light transmission hole portion 30 of the intermediate wheel 23 occasionally correspond to the detection position P of the detection portion 13 . At this time, the reference position (00 minute position) of the minute wheel 25 coincides with the detected position P, but since the position of the hour wheel 27 of the second wheel 20 is unclear, the position of the second wheel 20 is detected first. Therefore, the operations of steps S30 to S33 are repeated so that the second light shielding portion 21 e of the second hand wheel 20 corresponds to the detection position P of the detection portion 13 .

Then, the number of times of non-detection by the detection unit 13 is counted, "1" is added to the non-detection flag (step S34), and it is judged whether the number of times of non-detection is consecutive four times (step S35). In this step S35, the operations of steps S31 to S35 are repeated until the number of times of non-detection by the detection unit 13 continues four times. When the number of non-detection times by the detection unit 13 is consecutive for four times, the second hand wheel 20 is rotated for 2 steps (step S36), the light emitting element 31 of the detection unit 13 is made to emit light (step S37), and whether the light receiving element 32 has received the light emitting element 31 light, thereby judging whether there is light detection by the detection unit 13 (step S38).

At this time, if there is light detection by the detection part 13 in step S38, the reference position (00 minute position) of the minute hand wheel 25 coincides with the detection position P, and the second light transmission hole part 28 of the minute hand wheel 25 and the hour hand In the state where any circular hole of the third light-transmitting hole portion 29 of the wheel 27 coincides with the detection position P, it is determined that the first circular hole 21a of the first light-transmitting hole portion 21 of the second hand wheel 20 is consistent with the position of the detecting portion 13. The detection position P coincides. Accordingly, it is determined that the reference positions of the second wheel 20 and the minute wheel 25 are (00 minutes 00 seconds position), and the process proceeds to the hour hand position detection process of step S70 described later.

However, in step S33, when it is determined that the light has not been detected by the detection unit 13, although the rotation positions of all the second hand wheel 20, the minute hand wheel 25, and the hour hand wheel 27 are unclear, the number of times that the light has not passed the detection unit 13 is counted. Counting, and adding "1" to the undetected flag (step S34), and judging whether the number of times of undetected is four consecutive times (step S35). In this step S35, the operations of steps S31 to S35 are repeated until the number of times of non-detection by the detection unit 13 continues four times.

And in step S35, when the number of non-detection by the detection part 13 is consecutive four times, the second hand wheel 20 is rotated by 2 steps (step S36), the light emitting element 31 of the detection part 13 is made to emit light (step S37), and whether the light receiving element 32 is The light of the light-emitting element 31 is received, and it is judged whether or not light has been detected by the detection unit 13 (step S38).

At this time, when there is light detection by the detection part 13, the first circular hole 21a of the first light transmission hole part 21 of the second hand wheel 20 coincides with the detection position P of the detection part 13, and the second circular hole 21a of the minute hand wheel 25 coincides with the detection position P of the detection part 13. Any circular hole of the light transmission hole 28, the third light transmission hole 29 of the hour hand wheel 27, and the fourth light transmission hole 30 of the intermediate wheel 23 are also consistent with the detection position P, so the same as above-mentioned occasions, specify The reference position of the seconds wheel 20 and the minute wheel 25 is (00 minutes and 00 seconds position), and the operation proceeds to the minute hand position detection process of step S70 described later.

However, in step S38, if there is no light detection by the detection unit 13, as shown in FIG. Since the non-detection state of the detection part 13 has passed five times in succession, it is determined that the second light transmission hole part 28 of the minute hand wheel 25, the third light transmission hole part 29 of the hour hand wheel 27, and the fourth light transmission hole part of the intermediate wheel 23 Any one of the parts 30 deviates from the detection position P, and proceeds to step S41 shown in FIG. 20 to perform minute hand position detection processing.

In this minute hand position detection process, as shown in FIG. 20 , the minute hand wheel 25 is rotated by one step (1°) in step S41, and the light emitting element 31 of the detection part 13 is made to emit light (step S42). The light from the element 31 is used to judge whether there is light detection by the detection unit 13 (step S43). At this time, if there is no light detection by the detection unit 13, the minute wheel 25 is rotated one step at a time, and it is judged whether the minute wheel 25 has rotated 360° (step S44), until the minute wheel 25 rotates one turn, and it is repeated. above action.

At this time, when there is light detection by the detection part 13 in step S43, the first circular hole 21a of the first light transmission hole part 21 of the second hand wheel 20, the second light transmission hole part 28 of the minute hand wheel 25, Any one circular hole of the third light transmission hole 29 of the hour hand wheel 27, and all of the fourth light transmission hole 30 of the intermediate wheel 23 are consistent with the detection position P of the detection part 13. Before starting step S41, the minute hand wheel 25 and The hour wheel 27 deviates. At present, it is assumed that the light detection by the detection unit 13 is performed in step S43 , and therefore, the reference position (00 minute position) of the minute hand wheel 25 is specified to coincide with the detection position P. As shown in FIG. Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 coincides with the detection position P at this time, as described above, return to step S30, execute the second hand position detection process up to step S38, and make the second hand wheel 20 When the reference position (00 second position) is the detection position P, the process proceeds to the hour hand position detection process of step S70 to be described later.

However, even if the minute wheel 25 is rotated by 360° in step S44, if the light of the detection unit 13 is not detected in step S43, as shown in FIG. Position P is corresponding, and second hand wheel 20 is rotated 30 steps (180 °) (step S45), makes the light-emitting element 31 of detection part 13 emit light (step S46), by detecting whether light-receiving element 32 has received the light of this light-emitting element 31, Accordingly, it is judged whether or not light has been detected by the detection unit 13 (step S47).

At this time, when there is light detection by the detection unit 13 in step S47, the first light transmission hole 21 of the second hand wheel 20, the second light transmission hole 28 of the minute hand wheel 25, and the third light transmission hole of the hour hand wheel 27 All of the circular holes of the light hole 29 and the fourth light transmission hole 30 of the intermediate wheel 23 coincide with the detection position P of the detection part 13, and the second hand wheel 20 deviates before step S45 starts to rotate. At present, it is assumed that the light detection by the detection unit 13 is performed in step S47 , and therefore, the reference position (00 minute position) specified as the minute wheel 25 coincides with the detection position P. As shown in FIG. Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 is at the detection position P at this time, as described above, return to step S30, execute the second hand position detection process up to step S38, and make the reference position of the second hand wheel 20 When the position (00 second position) is the detection position P, the process proceeds to the hour hand position detection process of step S70 described later.

However, even if the seconds wheel 20 is rotated by 30 steps (180°) in step S45, if the light of the detection unit 13 is not detected in step S47, as shown in FIG. Corresponding to the detection position P, it is also judged that the second light transmission hole portion 28 of the minute wheel 25 deviates from the detection position P, and the minute wheel 25 is rotated by one step (step S48).

Then, the light-emitting element 31 of the detection unit 13 is made to emit light (step S49), and whether or not light is detected by the detection unit 13 is determined by detecting whether the light-receiving element 32 receives the light of the light-emitting element 31 (step S49). At this time, if there is no light detection by the detection part 13, then the minute wheel 25 is rotated one step at a time, and it is judged whether the minute wheel 25 has rotated 360° (step S51), until the minute wheel 25 rotates once, and it is repeated. Actions from step S48 to step S50.

At this time, when there is light detection by the detection part 13 in step S50, the first light transmission hole 21 of the second hand wheel 20, the second light transmission hole 28 of the minute hand wheel 25, and the third light transmission hole of the hour hand wheel 27 All of the circular holes of the light hole portion 29 and the fourth light transmission hole portion 30 of the intermediate wheel 23 coincide with the detection position P of the detection portion 13 . On the other hand, the minute wheel 25 deviates in the stage before the light detection in step S50. At present, it is assumed that the light detection by the detection unit 13 is performed in step S50 , and therefore, the reference position (00 minute position) specified as the minute wheel 25 coincides with the detection position P. As shown in FIG. Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 is at the detection position P at this time, as described above, return to step S30, execute the second hand position detection process up to step S38, and make the reference position of the second hand wheel 20 When the position (00 second position) is the detection position P, the process proceeds to the hour hand position detection process of step S70 described later.

However, even if the minute wheel 25 is rotated 360° in step S51, if the light of the detection unit 13 is not detected in step S50, as shown in FIG. The second light transmission hole portion 28 and the fourth light transmission hole portion 30 of the intermediate wheel 23 correspond to the detection position P, and any circular hole of the third light transmission hole portion 29 of the hour hand wheel 27 deviates from the detection position P, thereby judging The fourth light shielding portion 29 a which is the hour wheel 27 corresponds to the detection position P. As shown in FIG.

At this time, at first, since it is unclear whether the first light transmission hole portion 21 of the second hand wheel 20 corresponds to the detection position P, the second hand wheel 20 is rotated 30 steps (180°) (step S52), and the light emitting element of the detection unit 13 31 emits light (step S53), and by detecting whether the light receiving element 32 has received the light of the light emitting element 31, it is judged whether there is light detection by the detection unit 13 (step S54).

At this time, when there is light detection by the detection part 13, the first light transmission hole part 21 of the second hand wheel 20, the second light transmission hole part 28 of the minute hand wheel 25, and the third light transmission hole part of the hour hand wheel 27 29, all of the fourth light-transmitting hole portion 30 of the intermediate wheel 23 is consistent with the detection position P of the detection part 13, and the fourth light shielding part 29a of the hour hand wheel 27 corresponds to the detection position P. In addition, in In the stage before the rotation of the second wheel 20 is started in step S52, the second wheel 20 is deviated. Since light detection by the detection unit 13 is assumed at present, the reference position (00 minute position) specified as the minute wheel 25 coincides with the detection position P. As shown in FIG. Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 is at the detection position P at this time, as described above, return to step S30, execute the second hand position detection process up to step S38, and make the reference position of the second hand wheel 20 When the position (00 second position) is the detection position P, the process proceeds to the hour hand position detection process of step S70 described later.

However, in the case where the light detection by the detection unit 13 is not performed in step S54, as shown in FIG. S55), make the light-emitting element 31 of the detection part 13 emit light (step S56), and determine whether there is light detection by the detection part 13 by detecting whether the light-receiving element 32 receives the light of the light-emitting element 31 (step S57). At this time, if there is no light detection by the detection part 13, the minute wheel 25 is rotated one step at a time, and it is judged whether the minute wheel 25 has rotated 360° (step S58), until the minute wheel 25 rotates one turn, and it is repeated. Actions from Step S55 to Step S57.

In step S57, when there is light detection by the detection unit 13, the first light transmission hole 21 of the second hand wheel 20, the second light transmission hole 28 of the minute hand wheel 25, and the third light transmission hole 29 of the hour hand wheel 27 All of the circular hole of any one of the intermediate wheel 23 and the fourth light-transmitting hole portion 30 are consistent with the detection position P of the detection part 13, and the fourth light shielding part 29a of the hour hand wheel 27 corresponds to the detection position P. In addition, in step At the stage before the rotation of the minute wheel 25 is started in S55, the minute wheel 25 is deviated. Also in this case, it is assumed that the light detected by the detection unit 13 has been detected in step S57, and therefore, the reference position (00 minute position) of the minute hand wheel 25 is specified to coincide with the detection position P. Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 coincides with the detection position P at this time, as described above, return to step S30, and execute the second hand position detection process up to step S38, so that the second hand wheel 20 is After detecting the position P, the process proceeds to the minute hand position confirmation process of step S70 described later.

In addition, even if the minute wheel 25 rotates 360° in step S58 in step S58, if it is not detected by the light of the detection part 13 in step S57, it is assumed that the fourth light shielding part 29a of the hour wheel 27 corresponds to the detection position P, and the hour wheel 27 At "11 o'clock position". In order to confirm whether the hypothesis is correct, the second hand wheel 20 is rotated 30 steps (rotating 180°) (step S59), and the light emitting element 31 of the detection part 13 is made to emit light (step S60). to determine whether there is light detection by the detection unit 13 (step S61).

At this time, when there is light detection by the detection part 13, the first light transmission hole part 21 of the second hand wheel 20, the second light transmission hole part 28 of the minute hand wheel 25, and the third light transmission hole part of the hour hand wheel 27 29, all of the fourth light-transmitting hole portion 30 of the intermediate wheel 23 is consistent with the detection position P of the detection part 13, and the hour hand wheel 27 is not at the "11 o'clock position". In addition, the second hand is started in step S59. In the phase preceding the rotation of the wheel 20, the seconds wheel 20 is deflected. Since light detection by the detection unit 13 is assumed at present, the reference position (00 minute position) specified as the minute wheel 25 coincides with the detection position P. As shown in FIG. Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 coincides with the detection position P at this time, as described above, return to step S30, execute the second hand position detection process up to step S38, and make the second hand wheel 20 When the reference position (00 second position) is the detection position P, the process proceeds to the minute hand position confirmation process of step S70 described later.

In addition, when the light detection by the detection part 13 is not detected in step S61, the fourth light-shielding part 29a of the virtual hour hand wheel 27 corresponds to the detection position P, and the minute hand wheel 25 is rotated by one step (step S62), and the light of the detection part 13 is turned The element 31 emits light (step S63 ), and by detecting whether the light receiving element 32 has received the light of the light emitting element 31 , it is judged whether there is light detection by the detection unit 13 (step S64 ).

At this time, if the light detection by the detection part 13 is not passed in step S64, the minute wheel 25 is rotated one step at a time, and it is judged whether the minute wheel 25 has rotated 360° (step S65), until the minute wheel 25 rotates 360° , the operations from step S62 to step S64 are repeated. Even if the actions from step S62 to step S64 are repeated, if there is no light detection by the detection unit 13, an error is displayed (step S66). In addition, if there is light detection by the detection unit 13 in step S64, the specified The reference position "0 o'clock position" of the hour hand wheel 27 and the reference position (00 minute position) of the minute hand wheel coincide with the detection position P.

Since it is unclear whether the reference position (00 second position) of the second hand wheel 20 is at the detection position P at this time, it returns to step S30 of the second hand position detection process, and executes the second hand position detection process up to step S38, so that the reference position of the second hand wheel 20 When the position matches the detected position P, the process proceeds to the hour hand position detection process of step S70 shown in FIG. 21 . In step S70 of the hour hand position detection process, since the respective reference positions of the second wheel 20 and the minute wheel 25 are at the detection position P, the minute wheel 25 is rotated 360° and the hour wheel 27 is rotated 30°. Make the light emitting element 31 of the detection unit 13 emit light (step S71), and determine whether there is light detection by the detection unit 13 by detecting whether the light receiving element 32 receives the light of the light emitting element 31 (step S72).

At this time, when the light detection by the detection part 13 occurs every time the hour hand wheel 27 rotates 30°, each circular hole of the third light-transmitting hole portion 29 of the hour hand wheel 27 corresponds to the detection position P in order, so that the hour hand Wheel 27 is on the hour. Therefore, returning to step S70, until the fourth light shielding portion 29a of the hour wheel 27 corresponds to the detection position P, the operations from step S70 to step S72 are repeated. If there is no light detection by the detection unit 13, it is determined that the fourth light shielding portion 29a of the hour wheel 27 corresponds to the detection position P, and the hour wheel 27 is at the "11 o'clock position".

In order to confirm whether the judgment is correct, again, the minute hand wheel 25 is rotated 360° and the hour hand wheel 27 is rotated 30° (step S73), and the light emitting element 31 of the detection part 13 is made to emit light (step S74). The light of the light-emitting element 31 is detected, and it is judged whether there is light detection by the detection unit 13 (step S75). At this time, if there is light detection by the detection unit 13, the reference position of all the second hand wheel 20, the minute hand wheel 25, and the hour hand wheel 27 is specified (0:00:00 second position), and the second hand 2, minute hand 3 1. After the hour hand 4 checks the current time (step S76), it transfers to the normal pointer operation and ends the operation flow. It should be noted that in step S75 there must be light detection by the detection unit 13, and if no light detection is assumed, an error is displayed (step S77).

Next, referring to FIG. 22 , the hand position checking process for checking whether the three hands of the second hand 2 , the minute hand 3 , and the hour hand 4 are accurate at every hour during normal hand movement will be described.

This hand position confirmation process is to perform detection by the detection unit 13 at every hour except 11 o’clock and 23 o’clock. When there is light detection by the detection unit 13, the hour hand 4 is regarded as accurate, and it is confirmed whether the second hand 2 is correct or not. Accurate processing and confirmation are limited to occasions where the deviation of the minute hand 3 is less than minus 1 hour. In addition, in this hand position confirmation process, if 10 seconds pass from the hour of the relevant confirmation, the minute wheel 25 rotates by one step, and the intermediate wheel 23 rotates 30° accordingly, thereby blocking the detection position P of the detection part 13. , it is necessary to confirm the deviation of the second hand 2 within the 10 seconds.

Therefore, the needle position confirmation process is started once the hour arrives, and the light-emitting element 31 of the detection part 13 is made to emit light (step S80). 13 light detection (step S81), if the light detection by the detection unit 13 is not passed, it is judged that at least one of the second hand 2, the minute hand 3, and the hour hand 4 is inaccurate, and transfers to the above-mentioned three-hand position detection process.

In addition, if there is light detection by the detection unit 13, it is determined that the first light transmission hole portion 21 of the second hand wheel 20 corresponds to the detection position P of the detection unit 13, and the number of times of non-detection by the detection unit 13 up to the previous time is counted. Clear, and the undetected flag is set to "0" (step S82), make the second hand wheel 20 carry out the normal operation of 1 step (6 °) and make the second hand 2 carry out the normal pointer operation (step S83), and judge the second hand wheel 20 is rotated by 2 steps (12°) (step S84). That is, the second hand wheel 20 only rotates 1 step (6°), and the first circular hole 21a of the second hand wheel 20 does not completely leave the detection position P of the detection part 13. Therefore, every 2 steps of the second hand wheel 20 are passed through. Section 13 for light detection.

In this step S84, if the second hand wheel 20 does not rotate 2 steps, then until the second hand wheel 20 rotates 2 steps, the second hand 2 is made to perform a normal pointer operation of 1 step (6°); if the second hand wheel 20 rotates 2 steps, then Make the light-emitting element 31 of the detection unit 13 emit light (step S85), and determine whether there is light detection by the detection unit 13 by detecting whether the light-receiving element 32 receives the light of the light-emitting element 31 (step S86). At this time, if there is light detection by the detection part 13, any one of the first circular hole 21a, the second and the third elongated holes 21b, 21c of the first light transmission hole part 21 of the second hand wheel 20 and the detection part If the detection position P of 13 matches, it is judged that the second hand wheel 20 is not accurate before step S84 is started, and the process shifts to the above-mentioned three-hand position detection process.

In addition, when there is no light detection by the detection unit 13 in step S86, as shown in FIG. 15B , it is determined that the first to third light shielding parts 21d to 21f of the second hand wheel 20 correspond to the detection position P, and the detection position P corresponds to the detection position P. 13 non-detection times are counted, and "1" is added to the non-detection flag (step S87), and it is judged whether the non-detection times are consecutive three times (step S88). At this time, if the non-detection count has not been detected three times in a row, then return to step S83, make the second hand 2 perform normal hand movement, and repeat the actions up to step S87.

In addition, in step S88, if from the state of FIG. 18D to the state of FIG. 18B , if the undetected number of times has passed three consecutive times after 6 seconds from the hour, it is determined that the first light-shielding portion 21d of the second hand wheel 20 and the second light-shielding portion 21d are not detected. One of the light-shielding parts 21e corresponds to the detection position P, and the second hand wheel 20 is rotated by one step (6°) so that the second hand 2 performs normal hand motion (step S89). It is judged whether the second hand wheel 20 has rotated 2 steps (step S90 ), until the second hand wheel 20 has rotated 2 steps, and the second hand 2 is operated normally.

If the second hand wheel 20 has rotated 2 steps, the light-emitting element 31 of the detection part 13 is made to emit light (step S91), and by detecting whether the light-receiving element 32 has received the light of the light-emitting element 31, it is judged when 8 seconds have passed from the hour. Whether or not there is light passing through the detection unit 13 is detected (step S92). At this time, if there is no light detection by the detection part 13, the second light shielding part 21e of the second hand wheel 20 corresponds to the detection position P, and it is judged that the position of the second hand wheel 20 is correct, and the above-mentioned three-hand position detection process is transferred. In addition, in step S92, as shown in FIG. 15E , if there is light detection by the detection unit 13, the detection position P of the detection unit 13 corresponds to a part of the second elongated hole 21b of the second hand wheel 20, and it is determined that the second hand wheel 20 The position of the machine is accurate, and the operation flow is ended after transferring to normal operation.

Like this, adopt this pointer type watch, owing to possess: utilize the rotation of second hand wheel 20 to make the first drive system 11 of second hand 2 pointer rotation; The second driving system 12; and the first to third light-transmitting hole portions 21, 28 respectively provided on the second hand wheel 20, the minute hand wheel 25, and the hour hand wheel 27 that are rotated on the same shaft in a superimposed state , 29 detect whether the light is transmitted and judge the detection part 13 of each rotation position of the second hand wheel 20, the minute hand wheel 25, and the hour hand wheel 27. The first light transmission hole portion 21 of the second hand wheel 20 has: The first circular hole 21a at the reference position; and the first and second light-shielding parts 21d, 21e at different intervals on both sides of the first circular hole 21a on the side of the second hand 2 in the direction in which the hand moves and on the side opposite to it. The provided second and third elongated holes 21b, 21c, therefore, can detect the rotational position of the second hand wheel 20 accurately and reliably.

That is, in this wristwatch, when the second hand wheel 20 rotates, the first light shielding part 21d and the second light shielding part 21e located on both sides of the first circular hole 21a of the second hand wheel 20 are positioned by the undetected state of the detection part 13. Instead, the second light shielding portion 21e from the third elongated hole 21c to the first circular hole 21a on the side opposite to the direction in which the pointer of the second hand 2 runs is counted the number of undetected times by the detection portion 13. After the number of counts reaches the predetermined number set in advance, when the detection unit 13 detects the first circular hole 21a, it can be determined that the second hand 2 is pointing to the hour (00 second position). Accordingly, it is not necessary to provide a light-transmitting hole as in the conventional example on the fifth wheel 18 that transmits the rotation of the first stepping motor 17 to the second wheel 20, and the rotational position of the second wheel 20 can be accurately and reliably detected. .

In this case, the second and third elongated holes 21b and 21c of the first light-transmitting hole portion 21 of the second hand wheel 20 are arc-shaped correspondingly provided on the rotational movement track of the first circular hole 21a of the second hand wheel 20 . long hole, by setting the third light shielding part 21f between the second and third long holes 21b and 21c located on the diagonal line of the first circular hole 21a, even if the second and third The elongated holes 21b, 21c can also ensure the strength of the second hand wheel 20 by the third light shielding portion 21f, and the second and third elongated holes 21b, 21c can be formed to be sufficiently long. Thus, when the first light transmission hole 21 of the second hand wheel 20 is optically detected by the detection unit 13 composed of the light emitting element 31 and the light receiving element 32, the light transmitted through the second and third elongated holes 21b, 21c can be Therefore, even if the second hand wheel 20 is rotated at a high speed, the rotational position of the second hand wheel 20 can be accurately detected.

In addition, in this watch, since the second light transmission hole portion 28 of the minute hand wheel 25 is a circular hole arranged at the reference position (00 minute position) of the minute hand wheel 25, the third light transmission hole portion 29 of the hour hand wheel 27 From the circular holes provided at intervals of 30° along the circumference from the reference position of the hour hand wheel 27, a fourth light shielding portion 29a is provided between the circular hole at the reference position and the 11th circular hole, so that when the minute hand wheel is made When 25 rotates one circle, the second light-transmitting hole portion 28 of the minute hand wheel 25 corresponds to the third light-transmitting hole portion 29 of the hour hand wheel 27 except the fourth light-shielding portion 29a of the hour hand wheel 27, that is, 11 holes in sequence, so that Whether or not the reference position (00 minute position) of the minute wheel 25 coincides with the detection position P every time the minute wheel 25 is rotated once can be easily judged.

In this case, the hour wheel 27 rotates 30° every time the minute wheel 25 rotates one turn, so the 11 circular holes of the third light-transmitting hole portion 29 of the hour wheel 27 and the second transparent hole of the minute wheel 25 can be connected to each other. The light hole part 28 corresponds to the detection position P of the detection part 13 in sequence, and the position corresponding to the detection position P of the detection part 13 of the fourth light-shielding part 29a of the hour wheel 27 that can be specified is the position in front of the hour wheel 27 at 30° (11 o'clock position), it can be specified that in this state, the position at which the minute wheel 25 is further rotated one turn and the hour wheel 27 is rotated by 30° is the reference position (0 o'clock position). Therefore, it is possible to easily judge the position of the hour wheel 27 The reference position (0 o'clock position).

In addition, the second drive system 12 is provided with an intermediate wheel 23 for transmitting the rotation of the second stepping motor 22 to the minute wheel 25. 28 is the fourth light-transmitting hole portion 30 formed by a circular hole corresponding to a circular hole. Therefore, when the minute hand wheel 25 is rotated by 1 step (1°) each time to detect the reference position of the minute hand wheel 25, the minute hand wheel 25 is only rotated by 1° with 1 step rotation, as shown in Figure 23, even if the second light transmission hole portion 28 of the minute hand wheel 25, that is, the circular hole is not completely deviated from the detection position P of the detection portion 13, the intermediate wheel 23 is used to rotate at 1°. The detection position P can be reliably blocked by the intermediate wheel 23 by step rotation of 30°. Therefore, even if the light detection by the detection part 13 is performed for each step rotation of the minute wheel 25, the detection part 13 can reliably prevent the detection part 13 from being aligned with the minute wheel. 25 false detections.

However, with regard to the first drive system 11 second hand wheel 20, due to the first light shielding portion 21d located in the pointer running direction of the second hand 2 among the first and second light shielding portions 21d, 21e, the second hand wheel 20 is used A circular hole 21a is used as a reference, and at an interval of about 48°, that is to say, at an interval of about three times that of the first circular hole 21a (actually a width of about 36° to the circumference) is set on the pointer of the second hand 2 One side of the running direction, so when the second hand wheel 20 is rotated by 1 step (6°) each time to make the second hand 2 perform normal pointer operation, if the second hand wheel 20 is rotated by 6 steps (36°), the first light shielding part 21d passes the detection. position P, so that a part of the second elongated hole 21b can be made to correspond to the detection position P in the next two-step rotation, whereby the rotational position of the second hand wheel 20 can be confirmed in 8 seconds.

That is, when confirming whether the needle position of the second hand 2 is correct when the normal pointer is running, if 10 seconds pass from the hour, the minute hand wheel 25 rotates 1°, and the intermediate wheel 23 rotates 30° accordingly, so that the fourth light-transmitting hole portion 30 deviates from the detection position P, so that the intermediate wheel 23 blocks the detection position P, therefore, it is necessary to confirm the hand position of the second hand 2 within this 10 seconds. Therefore, as long as the hand comparison is less than 1 hour, it can be confirmed whether the hand position of the second hand 2 is correct during normal hand operation in 8 seconds from the hour, so the hand position of the second hand 2 can be confirmed effectively and quickly.

In addition, among the first and second light-shielding parts 21d and 21e of the second hand wheel 20, the second light-shielding part 21e located on the side opposite to the direction in which the pointer of the second hand 2 is running is formed by the first circular hole 21a of the second hand wheel 20. As a reference, and at an interval of approximately 60°, that is, at an interval of about four times that of the first circular hole 21a (actually a width of about 48° to the circumference), and at intervals shorter than the interval of the first light shielding portion 21d. The distance corresponding to the length of one first circular hole 21a is set on the side opposite to the direction in which the pointer of the second hand 2 moves, so that when counting the undetected state of the second light shielding part 21e by the passing detection part 13, the second light shielding part 21e passes through The second hand wheel 20 is rotated by 2 steps (12°) at a time, which can be specified as the reference position of the second hand wheel 20 (00 seconds) after the detection portion 13 detects the first circular hole 21a after four consecutive undetected times. Location). Accordingly, it is possible to accurately and reliably detect the rotational position of the second wheel 20 .

Furthermore, since the first light shielding portion 21d of the second hand wheel 20 corresponds to a part of the third elongated hole 21c of the first light transmission hole portion 21 located on its diagonal line, the second light shielding portion 21e corresponds to a part of the third elongated hole 21c located on its diagonal line. A part of the second elongated hole 21b of the first light-transmitting hole portion 21 corresponds to a part, and the third light-shielding portion 21f corresponds to a part of the first circular hole 21a of the first light-transmitting hole portion 21 located on its diagonal line, thereby In the state where any one of the first to third light shielding parts 21d to 21f corresponds to the detection position P of the detection part 13, if the second hand wheel 20 is rotated 30 steps (180°), the first light transmission hole part 21 can be It must correspond to the detection position P. Therefore, when detecting the rotational positions of the minute wheel 25 and the hour wheel 27, it can be quickly judged whether the second wheel 20 deviates from the detection position P, or whether the minute wheel 25 and the hour wheel 27 are rotated by half a turn of the second wheel 20. Deviation, thus, the time required for position detection can be greatly shortened.

In addition, in the above-mentioned embodiment, the case where the second and third elongated holes 21b and 21c of the first light-transmitting hole portion 21 are respectively formed as arc-shaped continuous elongated holes in the second hand wheel 20 has been described. However, the second wheel 20 is not limited to this, and may be configured as in the first modification example shown in FIG. 24, for example.

That is, the second hand wheel 20 of the first modified example, as shown in FIG. 21c is also divided into two long holes 41a and 41b.

In this case, the elongated holes 40a adjacent to the first circular hole 21a of the second elongated hole 21b are based on the first circular hole 21a and at intervals of about 48° to 96°, that is, in the first circle. The length of about five times of the shape hole 21a (actually a width of about 60° to the circumference) is set, and the second elongated hole 21b is positioned at the elongated hole 40b on the side opposite to the first circular hole 21a, with the first circle The shaped hole 21a is based on the interval of about 120° to 168°, that is, the net length is about five times that of the first circular hole 21a (the width is about 60° to the circumference). Between the two elongated holes 40a, 40b of the second elongated hole 21b, a fifth light shielding portion 42 is arranged so as to be aligned with the elongated hole 40a of the second elongated hole 21b on the diameter of the second hand wheel 20. Part of corresponds to.

In addition, the elongated holes 41a adjacent to the first circular hole 21a of the third elongated hole 21c are based on the first circular hole 21a, and at intervals of about 60° to 96°, that is, the first circular hole The length of about four times of 21a (actually the width of about 48° to the circumference) is set, and the elongated hole 41b that is positioned on the side opposite to the first circular hole 21a in the third elongated hole 21c is formed by the first circular hole 21a as a reference, and set at an interval of about 120° to 168°, that is, about five times the net length of the first circular hole 21a (the width is about 60° for the circumference). Between the two elongated holes 41a and 41b of the third elongated hole 21c, a sixth light shielding portion 43 is provided. A part of the hole 41a corresponds.

Furthermore, between the first circular hole 21a at the reference position and the elongated hole 40a of the second elongated hole 21b adjacent thereto, a first light shielding portion 21d is provided in the same manner as in the above-mentioned embodiment. Between the first circular hole 21a and the elongated hole 41a of the third elongated hole 21c adjacent thereto, the second light shielding portion 21e is provided similarly to the above-mentioned embodiment. In addition, between the elongated hole 40b of the second elongated hole 21b and the elongated hole 41b of the third elongated hole 21c located on the diameter of the second hand wheel 20 with respect to the first circular hole 21a, the same as the above-mentioned embodiment. , The third light shielding portion 21f is provided.

In this case, the first light-shielding portion 21d is also based on the first circular hole 21a, and at an interval of about 48°, that is, about three times the width of the first circular hole 21a (the actual circumference is about 36°). ) at intervals, and constituted to correspond to the elongated holes 41b of the third elongated holes 21c located on the diameter of the second hand wheel 20. In addition, the second light-shielding portion 21e is based on the first circular hole 21a, and at an interval of about 60°, that is, about four times the width of the first circular hole 21a (actually a width of about 48° to the circumference). The intervals are set and configured to correspond to the elongated holes 40b of the second elongated holes 21b located on the diameter of the second hand wheel 20 . The third, fifth, and sixth light-shielding parts 21f, 42, and 43 are provided with approximately the same size as the first circular hole 21a, and are configured to be the same as the first circular hole 21a and the third circular hole 21a located on the diameter of the second hand wheel 20. The elongated hole 41a of the elongated hole 21c and the elongated hole 40a of the second elongated hole 21b correspond to each other.

In such a second hand wheel 20, it is also configured such that in a state where any of the first to third, fifth, and sixth light shielding portions 21d to 21f, 42, and 43 corresponds to the detection position P of the detection portion 13, if Make the second hand wheel 20 rotate 30 steps (180 °), then the first circular hole 21a of the first light-transmitting hole portion 21, the two long holes 40a, 40b of the second long hole 21b, and the two long holes 40b of the third long hole 21c Any one of the long hole 41a and the long hole 41b must correspond to the detection position P of the detection part 13, so it has the same effect as the above-mentioned embodiment. In addition, the second long hole 21b is divided into two long holes. holes 40a, 40b, and the third elongated hole 21c is also divided into two elongated holes 41a, 41b, and respectively set between the two elongated holes 40a, 40b and between the elongated holes 41a, 41b Since the fifth and sixth light-shielding portions 42 and 43 are removed, the strength of the second wheel 20 can be increased more than in the above-mentioned embodiment.

In addition, in the above-mentioned embodiment and the first modified example of the second hand wheel 20, the first light-shielding portion 21d is set at the interval between the second long hole 21b of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position, that is, With the first circular hole 21a as a benchmark, and with an interval of about 48 °, that is, set with about three times of the first circular hole 21a (the actual width is about 36 ° for the circumference); the second light shielding part 21e is set with The distance between the third elongated hole 21c of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position, that is, with the first circular hole 21a as a reference, and at an interval of about 60°, that is, in the first circle The case where the shape hole 21a is set to about four times (the actual width is about 48° with respect to the circumference) has been described, but it is not limited to this, and it may be configured as the second modification example shown in FIG. 25 .

That is, the second modification example, as shown in FIG. 25 , is configured such that the first light-shielding portion 21d is separated by the distance between the second elongated hole 21b of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position, that is, by The first circular hole 21a is a reference, and is set at an interval of about 36°, that is, about twice (actually, a width of about 24° to the circumference) of the first circular hole 21a; The distance between the third elongated hole 21c of a light-transmitting hole portion 21 and the first circular hole 21a at the reference position, that is, the first circular hole 21a is used as a reference, and at an interval of about 48°, that is, in the first circular About three times the hole 21a (actually a width of about 36° with respect to the circumference) is set.

In this case, the second elongated hole 21b is divided into two elongated holes 40a, 40b similarly to the first modified example, and the fifth light shielding portion 42 is provided therebetween. The elongated holes 40a adjacent to the first circular hole 21a of the second elongated hole 21b are based on the first circular hole 21a, and at intervals of about 36° to 96°, that is, in actual ratio of the first modification. A length corresponding to one first circular hole 21a is formed on the side of the first circular hole 21a.

Moreover, the 3rd long hole 21c is divided into two long holes 41a, 41b similarly to the 1st modification, and the 6th light shielding part 43 is provided in between. The adjacent 41a of the third elongated hole 21c is based on the first circular hole 21a, and at an interval of about 264° to 312°, that is, it is actually longer than the first modification, which is equivalent to a first circle. The length of the shaped hole 21a is formed on the side of the first circular hole 21a.

In this case, the first light-shielding portion 21d between the second long hole 21b of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position is also configured to be the third longest on the diameter of the second hand wheel 20. The long hole 41b of the hole 21c corresponds. In addition, the second light-shielding portion 21e located between the third elongated hole 21c of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position is configured to be aligned with the second elongated hole 21b located on the diameter of the second hand wheel 20. The long hole 40b corresponds. In addition, the third, fifth, and sixth light-shielding portions 21f, 42, and 43 are also configured as the first circular hole 21a positioned on the diameter of the second hand wheel 20, the elongated hole 41a of the third elongated hole 21c, and the second elongated hole. The long holes 40a of the holes 21b correspond to each other.

In such a second hand wheel 20, it is also configured such that in a state where any of the first to third, fifth, and sixth light shielding portions 21d to 21f, 42, and 43 corresponds to the detection position P of the detection portion 13, if Make the second hand wheel 20 rotate 30 steps (180 °), then the first circular hole 21a of the first light-transmitting hole portion 21, the two long holes 40a, 40b of the second long hole 21b, and the two long holes 40b of the third long hole 21c Either one of the elongated hole 41a and the elongated hole 41b necessarily corresponds to the detection position P of the detection unit 13, and thus has the same effects as those of the above-mentioned embodiment and the first modification. In addition, there are the following effects.

That is, since the first light-shielding portion 21d between the second elongated hole 21b of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position is formed with the first circular hole 21a as a reference, and The interval of about 36° is about twice that of the first circular hole 21a (actually a width of about 24° to the circumference). Therefore, the second hand 20 is rotated by 1 step (6°) each time the second hand wheel 20 is rotated. When carrying out normal pointer operation, if the second hand wheel 20 rotates 4 steps (24°), then the first light shielding part 21d passes the detection position P, and rotates in the next 2 steps (the 6th second), which can make the long hole of the second long hole 21b A part of 40a corresponds to the detection position P, whereby the rotational position of the second wheel 20 can be confirmed after passing the detection position P in 6 seconds. Therefore, as long as the hands are collated for less than 60 minutes, it is possible to confirm whether the hand position of the second hand 2 is correct during normal hand operation more quickly than in the above-mentioned embodiment.

In addition, since the second light-shielding portion 21e between the third elongated hole 21c of the first light-transmitting hole portion 21 and the first circular hole 21a at the reference position is formed with the first circular hole 21a as a reference, and The interval of about 48°, that is, about three times of the first circular hole 21a (actually a width of about 36° to the circumference), therefore, the non-detection state for the second light shielding portion 21e of the passing detection portion 13 is carried out. When counting, by making the second hand wheel 20 rotate 2 steps (12°) each time, it can be judged that the position where the first circular hole 21a is detected by the detection unit 13 after the undetected number of times has been detected three times in succession is the reference point of the second hand wheel 20. position (00 second position), thereby, the reference position of the second hand 2 can be detected faster than in the above-mentioned embodiment, and the detection speed can be further improved.

Furthermore, in the above-mentioned embodiment and its modifications, regarding the shapes of the first to third light transmission holes 21, 28, 29 respectively provided on the second wheel 20, the minute wheel 25, and the hour wheel 27, The case where the circular shape has been described has been described, but other shapes such as square, trapezoidal, and polygonal are also possible.

Furthermore, in the case of the embodiment, the detection of the position of the hand is carried out as follows: the first circular hole 21a provided on the second hand wheel 20 is at the 00 second position; 28 is at the 00 minute position; one of the 11 third light transmission hole portions 29 arranged on the hour hand wheel 27 is at the 0 o’clock position, but it is not limited thereto, for example, the detected The position may also be as follows: the first circular hole 21a provided on the second hand wheel 20 is located at the 55 second position; the second light-transmitting hole portion 28 provided on the minute hand wheel 25 is located at the 55 minute position; One third light transmission hole 29 among the eleven third light transmission holes 29 is located at 11:55.

In addition, in the above-mentioned embodiment and its modifications, the application to an analog wristwatch has been described, but it does not necessarily have to be a wristwatch, and can be applied to various types of wristwatches such as travel watches, alarm clocks, table clocks, and wall clocks, for example. Analog clock.

Claims (15)

1. A needle position detection device, comprising: A second hand wheel (20) for the second hand (2) to perform pointer movement; Minute hand wheel (25) for minute hand (3); The hour hand wheel (27) that carries out the pointer operation to the hour hand (4); A light-emitting unit (31) that irradiates light to the first to third light-transmitting holes (21, 28, 29) respectively provided on the second wheel, the minute wheel, and the hour wheel; a light receiving unit (32) that receives light irradiated from the light emitting unit (31) and passed through the first to third light transmission holes (21, 28, 29); and A light-transmitting hole detection unit (13) for detecting whether the light emitted from the light-emitting unit (31) has passed through and judging the respective rotational positions of the second wheel, the minute wheel, and the hour wheel, characterized in that The first light transmission hole (21) includes: a first light detection hole (21a) provided at the reference position of the second hand wheel; , the third photodetection hole (21b, 21c), the above-mentioned first and second light-shielding parts (21d, 21e) are separated from the two sides of the second hand in the direction of movement of the second hand and the opposite direction of the first photodetection hole set at different intervals. 2. The needle position detection device according to claim 1, wherein: The above-mentioned second light-transmitting hole (28) is a light detection hole arranged on the reference position of the above-mentioned minute hand wheel, and the above-mentioned third light-transmitting hole (29) of the above-mentioned hour hand wheel is along the circumference from the reference position of the above-mentioned hour hand wheel. Eleven photodetection holes arranged at angular intervals of 30 degrees. 3. The needle position detection device according to claim 1, wherein: The second and third light detection holes are arc-shaped elongated holes correspondingly provided on the rotation track of the first light detection hole of the second hand wheel, between the second and third light detection holes, A third light shielding portion (21f) is provided so as to be on the same diameter as the second hand wheel as the first light detection hole. 4. The needle position detection device according to claim 3, wherein: Among the above-mentioned first and second light-shielding parts (21d, 21e), the above-mentioned first light-shielding part (21d) located on the side of the pointer running direction of the above-mentioned second hand (2) is based on the above-mentioned first light detection hole, and 36 degrees to 48 degrees, set on the side of the pointer running direction of the above-mentioned second hand, The above-mentioned second light-shielding part (21e), which is located on the side opposite to the running direction of the pointer of the above-mentioned second hand, is set on the side opposite to the pointer of the above-mentioned second hand at an angular interval of 48 degrees to 60 degrees with the above-mentioned first light detection hole as a reference. The side opposite to the direction of operation. 5. The needle position detection device according to claim 3, wherein: The first light shielding part (21d) corresponds to a part of the third light detection hole (21c), the second light shielding part (21e) corresponds to a part of the second light detection hole (21b), and the third light shielding part ( 21f) corresponds to the above-mentioned first light detection hole (21a). 6. The needle position detection device according to claim 1, wherein: It also includes an intermediate wheel (23) that transmits the rotation of the driving motor (22) to the above-mentioned minute wheel (25). The light-transmitting hole part (30). 7. A needle position detection device, characterized in that it has: A second hand wheel (20) having a first light-transmitting hole portion (21), the first light-transmitting hole portion (21) including a first light detection hole (21a) arranged at a reference position, and second and third light detection holes holes (21b, 21c); A minute wheel (25) arranged on the same shaft as the second wheel and having a second light-transmitting hole (28); An hour wheel (27) arranged on the same shaft as the second wheel and the minute wheel and having a third light-transmitting hole (29); The light transmission hole detection unit (13) has a light emitting unit (31), and the light transmission hole detection unit (13) detects whether the light emitted from the light emission unit (31) has passed through the first to third light transmission units. hole portion and determine the respective rotational positions of the above-mentioned second hand wheel, the above-mentioned minute hand wheel, and the above-mentioned hour hand wheel; and Second hand reference position detection unit, The second and third photodetection holes (21b, 21c) are set apart from the first and second light-shielding parts (21d, 21e), and the first and second light-shielding parts are arranged on the first light-detecting part with different lengths. sides of the hole, The second hand reference position detection unit rotates the second hand wheel in a preset rotation angle unit while detecting the presence or absence of light through the light transmission hole detection unit. In the following cases, the light transmission hole detection unit detects light The position of the second hand wheel is used as the reference position of the second hand wheel, that is, the position of the first light detection hole. In the above case, the second hand reference position detection unit judges that the number of consecutive times that the light has not been detected has reached a preset number of times, and thereafter, it is judged that When the second hand wheel is further rotated by a preset rotation angle unit, when the light transmission hole detection unit detects the light emitted from the light emitting unit (31), the light non-detection state is a state of no light detection. 8. The needle position detection device according to claim 7, wherein: The second hand (2) is further provided with an analog operation control unit for interlocking with the second hand wheel (20) to perform an analog operation of the second hand (2). 9. The needle position detection device according to claim 7, wherein: It is further equipped with the above-mentioned second light transmission hole portion (28) of the above-mentioned minute hand wheel (25) and the above-mentioned light transmission hole portion (27) of the above-mentioned hour hand wheel (27) when it is judged that the number of consecutive times of the above-mentioned non-detection state exceeds the above-mentioned preset number of times. The third light-transmitting hole (29) deviates from the detection position (P) by the above-mentioned light-transmitting hole detecting unit. 10. The needle position detection device according to claim 7, characterized in that, It is further equipped with a detection unit (13) that is not connected to any of the above-mentioned first light detection hole (21a), the above-mentioned second light detection hole (21b), and the above-mentioned third light detection hole (21c). In the state corresponding to the position (P), the above-mentioned second hand wheel is rotated 180 degrees, and any one of the above-mentioned first light detection hole, the above-mentioned second light detection hole, and the above-mentioned third light detection hole of the above-mentioned first light transmission hole portion A hole position corresponding unit corresponding to the above detection position. 11. A needle position detection device, characterized in that it has: a second hand wheel (20) having a first light-transmitting hole portion (21); A minute wheel (25) arranged on the same axis as the second hand wheel and having a second light-transmitting hole portion (28) composed of a light detection hole arranged at a reference position; An hour wheel (27) arranged on the same shaft as the second wheel and the minute wheel, and having a third light-transmitting hole portion (29) in which 11 light detection holes are arranged at angular intervals of 30 degrees along the circumference from the reference position ); An intermediate wheel (23) having a fourth light-transmitting hole (30) formed by one light-detecting hole of the second light-transmitting hole of the above-mentioned minute hand wheel corresponding to one light-detecting hole at the above-mentioned reference position; The light transmission hole detection unit (13) has a light emitting unit (31), and the light transmission hole detection unit (13) detects whether the light emitted from the light emission unit (31) has passed through the first to third light transmission units. hole portion and determine the respective rotational positions of the above-mentioned second hand wheel, the above-mentioned minute hand wheel, and the above-mentioned hour hand wheel; and The above-mentioned minute hand wheel is rotated one turn, and one light detection hole of the above-mentioned second light-transmitting hole part corresponds to one light-detecting hole of the fourth light-transmitting hole part of the above-mentioned intermediate wheel, so that the detection unit having the above-mentioned light-transmitting hole part Minute hand reference position detection means at which the light detection position of the light emitted from the light emitting unit (31) is performed as a reference position of the minute hand wheel. 12. The needle position detection device according to claim 11, wherein: It is further provided with an hourly point reference position detection unit which detects the second light transmission hole portion ( 28) The light detection hole corresponds to the above-mentioned 11 light detection holes of the above-mentioned third light-transmitting hole portion (29) of the above-mentioned hour hand wheel in sequence, so as to have the position of the light detection performed by the above-mentioned light-transmitting hole portion detection unit (13) As the full o'clock position of the above-mentioned hour hand wheel. 13. A needle position electronic device characterized in that, The device body is equipped with the needle position detection device according to claim 1 above. 14. A needle position electronic device characterized in that, The device body is equipped with the needle position detection device described in claim 7 above. 15. A needle position electronic device characterized in that, The device body is provided with the needle position detection device according to claim 11 above.

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