JP7143199B2 - radio clock - Google Patents

Description

The present invention relates to radio-controlled timepieces.

2. Description of the Related Art A radio clock having a flat antenna for receiving satellite signals and a digital display section for digitally displaying information is known. For example, Patent Literature 1 describes a radio-controlled timepiece in which a planar antenna is arranged so as not to overlap a digital display section when the time display section is viewed from above. In the radio-controlled timepiece described in Patent Document 1, by arranging the flat antenna so as not to overlap the digital display, it is possible to suppress deterioration of reception performance of the flat antenna due to the transparent electrode of the digital display. .

JP-A-2018-81072

However, in the radio-controlled timepiece described in Patent Document 1, the planar antenna is arranged so as not to overlap the digital display section, so the degree of freedom in arranging the planar antenna and the digital display section is reduced.

Therefore, the present invention provides a technique for a radio-controlled timepiece having a flat antenna and a digital display that can increase the degree of freedom in arranging the flat antenna and the digital display while suppressing the deterioration of the antenna characteristics of the flat antenna. intended to

In order to achieve the above object, a radio-controlled timepiece according to an embodiment includes: a body including a hollow region; a time display unit that is housed in the hollow region of the body and displays the time; A first side arranged on the opposite side and close to the inner peripheral wall of the barrel, a fourth side facing the first side and arranged in a direction away from the inner peripheral wall of the barrel, each end of the first side and the fourth side A planar antenna having a rectangular antenna electrode including a second side and a third side connecting each end of the controller, a control unit, and a signal output from the control unit arranged in the time display unit in plan view and a digital display device including electrodes connected to the digital display unit that displays information based on However, the digital display section and the electrodes are arranged so as not to overlap the second side and the third side.

Furthermore, in the radio-controlled timepiece according to the embodiment, the shape of the digital display section is rectangular, and the digital display device is arranged so that the long sides of the digital display section are parallel to the second and third sides. is preferred.

Further, in the radio-controlled timepiece according to the embodiment, the time display unit has a dial on which at least the first hour mark indicating 3 o'clock and the second hour mark indicating 9 o'clock are displayed. The display device is preferably arranged such that the long side of the digital display section is parallel to the extending direction of the line connecting the first mark and the second mark.

Furthermore, in the radio-controlled timepiece according to the embodiment, the digital display device is preferably arranged near the second mark.

Furthermore, in the radio-controlled timepiece according to the embodiment, the digital display device further has a display substrate on which the digital display section is mounted, and the display substrate has the first side and the fourth side when the time display section is viewed from above. are preferably arranged so as to overlap each other.

Further, in the radio-controlled timepiece according to the embodiment, the display substrate is a flexible substrate that is connected to the control unit via the curved portion, and the curved portion is the digital display unit when the time display unit is viewed from above. is preferably located outside the

Furthermore, the radio-controlled timepiece according to the embodiment preferably further includes a solar cell that is arranged so as not to overlap the digital display section when the time display section is viewed from above, and that generates power by external light.

Furthermore, in the radio-controlled timepiece according to the embodiment, it is preferable that the feeding point of the planar antenna be arranged at a position closer to the first side or the fourth side than the second side or the third side.

The radio-controlled timepiece according to the embodiment can increase the degree of freedom in arranging the planar antenna and the digital display section while suppressing deterioration of the antenna characteristics of the planar antenna.

1 is a plan view of a radio-controlled timepiece according to an embodiment; FIG. FIG. 2 is a perspective plan view of the radio-controlled timepiece shown in FIG. 1; FIG. 2 is a cross-sectional view taken along line AA of FIG. 1; 2 is a functional block diagram of the radio clock shown in FIG. 1; FIG. (a) is a perspective view of the planar antenna shown in FIG. 1, (b) is a diagram showing an equivalent model of the planar antenna shown in FIG. 1, and (c) is a plan view of the equivalent model shown in (b). be. 2 is a functional block diagram of the digital display device shown in FIG. 1; FIG. FIG. 3 is a partially enlarged view of a portion indicated by an arrow B in FIG. 2; FIG. 11 is a perspective plan view of a radio-controlled timepiece according to a modification; (a) is a perspective view of the planar antenna shown in FIG. 8, and (b) is a plan view of an equivalent model of the planar antenna shown in (a).

A radio-controlled timepiece according to an embodiment will be described below with reference to the drawings. However, it should be understood that the embodiments are not limited to the drawings or the embodiments described below.

(Overview of Radio-controlled Timepiece According to Embodiment)
In the radio-controlled timepiece according to the embodiment, when the time display section is viewed in plan, the digital display device for digitally displaying information is superimposed on the planar antenna for receiving satellite radio waves, thereby allowing freedom in arrangement of components. can be made higher.

(Structure and Function of Radio-controlled Timepiece According to Embodiment)
1 is a plan view of the radio-controlled timepiece according to the embodiment, FIG. 2 is a perspective plan view of the radio-controlled timepiece shown in FIG. 1, FIG. 3 is a cross-sectional view along line AA in FIG. 1, and FIG. 2 is a functional block diagram of the radio-controlled timepiece shown in FIG. 1; FIG.

The radio-controlled timepiece 1 has a planar antenna 10 , a receiving circuit 20 , an operation section 30 , a control section 40 , a digital display device 50 , a drive section 60 , a time display section 70 and a power supply section 80 . The planar antenna 10, the receiving circuit 20, the operation unit 30, the control unit 40, the digital display device 50, the driving unit 60, the time display unit 70, and the power supply unit 80 are each supported by the movement 91 via the circuit board 92. , are accommodated in the case 90 . The case 90 includes a body 94 and a bezel 95 including a hollow area, a cover glass 93 covering one side of the hollow area, a back cover 96 covering the other side, and the like. The barrel 94 and bezel 95 may be a barrel formed in one piece.

5(a) is a perspective view of the planar antenna 10, FIG. 5(b) is a diagram showing an equivalent model of the planar antenna 10, and FIG. 5(c) is a plan view of the equivalent model shown in FIG. 5(b). It is a diagram.

The planar antenna 10 has a substrate 11, an antenna electrode 12, and a feeding point 13, and is an antenna for receiving satellite radio waves carrying information including time information indicating time and data signals from an external device. , for example patch antennas can be used. Satellite radio waves are radio waves having a frequency of 1.57542 GHz, which are transmitted from GPS (Global Positioning System) satellites, for example. The base material 11 is a rectangular parallelepiped member made of a dielectric material, and the antenna electrode 12 is arranged on the surface on the cover glass 93 side. The antenna electrode 12 is made of a conductive material such as metal and has a rectangular shape when viewed from above. In this embodiment, it has a square shape. The antenna electrode 12 has a first side 121 on the side closer to the inner peripheral wall of the body 94, a fourth side 124 opposite to the first side 121, and a fourth side extending from each end of the first side 121 to the fourth side. It has a second side 122 and a third side 123 extending to each end of 124 . The length L of each of the first side 121, the second side 122, the third side 123, and the fourth side 124 is desirably adjusted to a length corresponding to half the wavelength of the radio wave to be received. Since the base material 11 is a dielectric material, the physical length of one side can be shortened by the wavelength shortening effect according to the dielectric constant of the dielectric material. The antenna electrode 12 is arranged such that the extending directions of the second side 122 and the third side 123 are parallel to the radial direction of the pointer shaft that rotates the hour hand 72 , minute hand 73 and second hand 74 .

Although the antenna electrode 12 has a square shape when viewed from the top, in the radio-controlled timepiece according to the embodiment, the shape of the antenna electrode when viewed from the top may be a parallelogram or a trapezoid. The sides of the antenna electrode may have a meandering shape.

Here, it has been described that the length L of all four sides of the present embodiment is adjusted to a length corresponding to 1/2 wavelength. and contributes to the reception sensitivity more than the first side 121 and the fourth side 124. Therefore, at least the lengths of the second side 122 and the third side 123 are equal to half the wavelength of the received radio wave. It should be adjusted to the appropriate length. Thereby, the planar antenna 10 can be miniaturized.

The feeding point 13 is positioned near the center of the first side 121 and is directly connected to the antenna electrode 12 when the planar antenna 10 is of the direct feeding type. Moreover, in the case of a capacitive coupling system, the antenna electrode 12 and the feeding point 13 are electrically connected. A current generated by receiving an external radio wave or a current supplied via the feeding point 13 flows intensively at the edge portion of each side of the antenna electrode 12 . In particular, when the case 90 is made of a conductive material, the first side 121 is close to the inner peripheral wall surface of the body 94, so that its contribution as an antenna is low. In such a planar antenna 10, the second side 122 and the third side 123 of the antenna electrode 12 extend in a direction away from the inner peripheral surface of the case 90 with respect to the first side 121, and serve as radiation sides for radio waves. It becomes an edge that contributes to reception. Note that the fourth side 124 is excited so as not to contribute as an antenna in consideration of symmetry with the first side 121, for example. In the planar antenna 10, since the current flows intensively in the second side 122 and the third side 123, the first dipole antenna 125 and the second dipole antenna 126 arranged on the second side 122 and the third side 123, respectively. function equivalently.

In the antenna electrode 12, the feeding point 13 is arranged near the center of the first side 121, which has a low contribution as an antenna. It may be arranged near the part.

The receiving circuit 20 is arranged on either the front surface or the back surface of the circuit board 92 on which the planar antenna 10 is arranged. , outputs received data, which is a bit string representing the information carried by the satellite radio waves. The received data output by the receiving circuit 20 includes time information indicating time. The receiving circuit 20 is preferably arranged near the planar antenna 10 . An impedance matching circuit may be arranged between the receiving circuit 20 and the planar antenna 10 to achieve impedance matching between the receiving circuit 20 and the planar antenna 10 .

The operation unit 30 has, for example, a first operation button 31 and a second operation button 32, which are push buttons, and a crown 33. The user using the radio-controlled timepiece 1 can adjust the calendar and time, and the position of the hands. Information is input for various actions such as corrective actions for the . The information output by the control unit 40 based on the signal input via the operation unit 30 is, for example, the hands driven via the motor drive circuit 46 (hour hand 72, minute hand 73, second hand 74, auxiliary hand 751, 761 and 771) or displayed on the digital display 50.

The control unit 40 has a storage circuit 41 , a reference signal generation circuit 42 , a voltage detection circuit 43 , an arithmetic circuit 44 , a display device drive circuit 45 and a motor drive circuit 46 . The control unit 40 determines the time displayed by the time display unit 70 based on the satellite radio waves received by the planar antenna 10 and generates display information indicating information to be displayed on the digital display device 50 . When determining the time displayed by the time display unit 70, the control unit 40 counts based on the reference signal generation circuit of the control unit 40 using the time information included in the information carried by the received satellite radio waves. Correct the internal time that is The control unit 40 displays the current time by generating a drive signal for the motor drive circuit 46 to drive the drive unit 60 according to the corrected internal time.

The memory circuit 41 has memory elements such as RAM (Random Access Memory) and ROM (Read Only Memory), and stores computer programs and data used for processing in the arithmetic circuit 44 . The reference signal generation circuit 42, also called RTC (Real Time Clock), has an oscillation circuit, generates a clock signal that is a reference signal used for timekeeping inside the radio-controlled timepiece 1, and outputs the generated clock signal. Output. The voltage detection circuit 43 detects the voltage of the battery 82 of the power supply unit 80 and outputs a voltage signal indicating the detected voltage to the arithmetic circuit 44 .

The arithmetic circuit 44 corrects the internal time measured by the clock signal input from the reference signal generation circuit 42 based on the reception data input from the reception circuit 20, and calculates the time displayed on the time display unit 70. and outputs a display time signal indicating the calculated time. Further, the arithmetic circuit 44 generates display information indicating information to be displayed on the digital display device 50 based on information such as the program stored in the storage circuit 41 and information input by the user via the operation unit 30, A display information signal indicating the generated display information is output.

Further, the arithmetic circuit 44 controls the receiving circuit 20, the motor driving circuit 46 (the driving section 60), the display device driving circuit 45 (the digital display device 50), etc. according to the voltage signal input from the voltage detecting circuit 43. . For example, when the voltage corresponding to the voltage signal becomes lower than a predetermined first threshold voltage, the arithmetic circuit 44 provides power warning information to the user that the remaining battery level is low and prompts the user to charge the battery. output a charging warning information signal indicating Based on this charge warning information signal, the pointers (hour hand 72, minute hand 73, second hand 74 and sub-hands 751, 761 and 771) are driven to indicate the charge level, and the charge level and warning are displayed on the digital display device 50. A display such as a display is made. Further, the arithmetic circuit 44 stops supplying power from the power supply unit 80 to the receiving circuit 20 and the digital display device 50 when the voltage corresponding to the voltage signal becomes lower than the predetermined second threshold voltage. At the same time, the controller 40 is shifted to a low power consumption mode in which it operates with low power consumption.

The display device drive circuit 45 outputs a display device drive signal for driving the digital display device 50 to the digital display device 50 according to the display information signal input from the arithmetic circuit 44 . Functions displayed on the display device 50 include, in addition to the display of the charge level and warning display described above, calendar information, city information (time zone information), latitude and longitude, reception result, reception display, and various status (mode) displays. , chrono measurement display, alarm time display, alarm time setting, and the like.

The motor drive circuit 46 outputs a drive signal for driving the step motor included in the drive section 60 according to the signal input from the arithmetic circuit 44 .

FIG. 6 is a functional block diagram of the digital display device 50. As shown in FIG.

The digital display device 50 has a digital display section 51 , a plurality of electrodes 52 , an X driver 53 , a Y driver 54 , a light emitting element 55 , a display control circuit 56 and a display substrate 57 . The digital display unit 51 can use LCD, organic EL, electronic paper, or the like, and can have various shapes depending on the display form. In this embodiment, a rectangular digital display element will be described. The digital display unit 51 digitally displays information according to display control signals input from the X driver 53 and the Y driver 54 via the plurality of electrodes 52 . A plurality of electrodes 52 are arranged in an electrode arrangement region 58 which is a region around the digital display section 51 and supply display control signals input from the X driver 53 and the Y driver 54 to the digital display section 51 .

Each of the X driver 53 and the Y driver 54 is arranged in the electrode arrangement region 58 and outputs a display control signal to the digital display section 51 according to the driver control signal inputted from the display control circuit 56 . The light emitting element 55 is, for example, a single or a plurality of light emitting diodes (LEDs), and functions as a backlight light source that blinks according to a light emitting element control signal input from the display control circuit 56 . Note that when the digital display unit 51 is a self-luminous display element such as organic electro-luminescence (OEL), the light-emitting element 55 is not arranged.

The display control circuit 56 generates a driver control signal for driving the X driver 53 and the Y driver 54 from the display device drive signal input from the display device drive circuit 45, and applies the generated driver control signal to the X driver 53 and the Y driver. 54. The display control circuit 56 also generates a light emitting element control signal for controlling the light emitting element 55 from the display device drive signal, and outputs the generated light emitting element control signal to the light emitting element 55 .

The display substrate 57 is a flexible substrate also called a flexible printed circuit (FPC), and includes a digital display section 51, a plurality of electrodes 52, an X driver 53, a Y driver 54, a light emitting element 55 and a display. A control circuit 56 is mounted. The display substrate 57 is connected to the control unit 40 via a curved portion 59 having a curved mounting surface for mounting elements and a circuit board 92 . The curved portion 59 is positioned outside the digital display portion 51 when the time display portion 70 is viewed from above.

The display substrate 57 may be a glass epoxy substrate, or may be a COG (Chip on Glass) substrate which is a glass substrate. Further, an FPC board may be used for connection between the circuit board 92 on which the control circuit 20 is mounted and the display board 57. Conductive connecting members such as conductive pins and conductive rubber may be used. Further, when an FPC board is used for connection between the circuit board 92 on which the control circuit 20 is mounted and the display board 57, the display control circuit 56, the X driver 53 and the Y driver 54 may be mounted on the FPC board. .

In addition, since the curved portion 59, which is a connection member that connects the display substrate 57 and the circuit substrate 92, contains a conductive material, it overlaps the second side 122 and the third side 123 when the digital display device 50 is viewed from above. It is preferable to place it so that it does not Also, the curved portion 59 is preferably arranged on the first side 121 or the fourth side 124 side. That is, it is preferable that the curved portion 59 be arranged on the outer case side or the pointer shaft (clockwise center) side with respect to the digital display portion 51 .

The drive unit 60 includes a plurality of step motors 61 , 62 and 63 , a train wheel 64 , and the like. to rotate. Each of the stepping motors 61 , 62 and 63 is covered with a magnetic shield 65 .

The time display unit 70 has a dial 71, an hour hand 72, a minute hand 73, a second hand 74, a first subdial 75, a second subdial 76, a third subdial 77, and a calendar window 78. . The dial 71 displays hour marks indicating 3 o'clock, 6 o'clock and 9 o'clock. The hour mark indicating 3 o'clock may also be referred to as the first mark, and the hour mark indicating 9 o'clock may also be referred to as the second mark.

Each of hour hand 72 , minute hand 73 and second hand 74 is rotated by drive unit 60 . The first sub-dial 75 is positioned near the hour mark indicating 12 o'clock, the second sub-dial 76 is positioned near the hour mark indicating 3 o'clock, and the third sub-dial 77 is positioned near the hour mark indicating 6 o'clock. placed in The first sub-dial 75, the second sub-dial 76, and the third sub-dial 77 are provided with sub-hands 751, 761, and 771, respectively, and have indexes (not shown). Each of the first sub-dial 75, the second sub-dial 76 and the third sub-dial 77 can be rotated to a desired position to indicate a predetermined index to display additional information such as the day of the week and the month. Display information. It should be noted that each of the first sub-dial 75, the second sub-dial 76 and the third sub-dial 77 may be formed by a digital display device. A calendar window 78 is positioned between the hour mark indicating 3 o'clock and the hour mark indicating 6 o'clock and displays the date displayed on the date dial 66 .

The power supply unit 80 has a solar cell 81 and a battery 82 . The solar cell 81 is arranged so as not to overlap the digital display portion 51 when the time display portion 70 is viewed from above, and generates power using external light such as sunlight that irradiates the radio-controlled timepiece 1 . It feeds the battery 82 . The battery 82 is a power storage device such as a secondary battery, stores power generated by the solar cell 81 , and supplies the stored power to the reception circuit 20 , the control section 40 , the digital display device 50 and the drive section 60 .

FIG. 7 is a partially enlarged view of the portion indicated by arrow B in FIG.

The digital display device 50 is arranged so as to overlap the planar antenna 10 when the time display section 70 is viewed in plan, and the electrode arrangement region 58 is formed by the second side 122 and It is arranged so as not to overlap any of the third sides 123 . Further, the digital display device 50 is arranged such that the long sides of the digital display section 51 are parallel to the second side 122 and the third side 123 .

Further, the digital display device 50 is arranged such that at least a portion of the first side 121 and the fourth side 124, which are a pair of sides of the antenna electrode 12, overlap when the time display section 70 is viewed from above. Here, it is arranged so as to overlap both the first side 121 and the fourth side 124 . Various information can be displayed on the digital display section 51 of the digital display device 50, and for example, "TYO" indicating Tokyo is displayed on the digital display section 51. FIG.

In addition, the digital display device 50 is arranged such that the long side of the digital display unit 51 is parallel to the extending direction of the line connecting the hour mark indicating 9 o'clock and the hour mark indicating 3 o'clock, that is, the direction indicated by the arrow C. is placed near the hour mark indicating 9 o'clock.

(Action and effect of the radio-controlled timepiece according to the embodiment)
When the time display unit 70 is viewed from the top, the radio-controlled timepiece 1 includes the step motors 61, 62 and 63, the solar cell 81, and the like by arranging the digital display device 50 so as to overlap at least a part of the planar antenna 10. The degree of freedom in arranging elements can be increased. In addition, since the radio-controlled timepiece 1 has a higher degree of freedom in arranging the components, the degree of freedom in arranging the time display section 70 including the dial 71 can be increased.

Also, in the radio-controlled timepiece 1 , the electrode arrangement area 58 is arranged so as not to overlap with either the second side 122 or the third side 123 of the planar antenna 10 when the time display section 70 is viewed from above. The radio-controlled watch 1 is arranged so that the electrode arrangement area 58 does not overlap either the second side 122 or the third side 123 that functions as a dipole antenna for receiving satellite radio waves, so that the planar antenna 10 can receive satellite radio waves. It is possible to suppress the deterioration of the antenna characteristics that occur.

Further, since the radio clock 1 is arranged so that the long sides of the digital display section 51 are parallel to the second side 122 and the third side 123, the characters are arranged parallel to the long sides of the digital display section 51. You can increase the number of characters displayed when displaying as

Further, the radio-controlled timepiece 1 is arranged so that the long side of the digital display portion 51 is parallel to the extension direction of the line connecting the hour mark indicating 3 o'clock and the hour mark indicating 9 o'clock. This makes it easier for the user who uses the to visually recognize characters displayed horizontally on the digital display unit 51 . In addition, since the digital display portion 51 of the radio-controlled timepiece 1 is arranged in the vicinity of the hour mark indicating 9 o'clock, the user using the radio-controlled timepiece 1 can further visually recognize the characters displayed in the horizontal direction on the digital display portion 51. becomes easier. In the radio-controlled timepiece 1, the digital display section 51 is arranged near the 9 o'clock hour mark, but the digital display section 51 is superimposed on the second side 122 and the third side 123 that affect the reception sensitivity of the planar antenna 10. It's fine if you don't. The shape and display method of the digital display section 51 can be appropriately set according to the arrangement of the planar antenna 10 .

Further, in the radio-controlled timepiece 1, the display substrate 57 on which the digital display section 51 is mounted is arranged so as to overlap both the first side 121 and the fourth side 124, so that the width of the digital display section 51 can be increased to increase the width of the digital display. The number of characters displayed in the portion 51 can be increased.

In the radio-controlled timepiece 1, the curved portion 59 is arranged outside the digital display portion 51 when the time display portion 70 is viewed from above, and the curved portion 59 is arranged inside the digital display portion 51. Easier to assemble.

In the radio-controlled timepiece 1, the digital display device 50 is arranged so as to overlap the planar antenna 10 when the time display section 70 is viewed from above. It can be made as large as possible to maximize power generation capacity.

In the radio-controlled timepiece 1, the light-emitting element 55, the display control circuit 56, and the like are arranged on the display board 57, which is a flexible printed board, by COF (Chip on Film). It is possible to suppress pressure on the mounting area of the substrate 92 .

(Modified example of the radio-controlled timepiece according to the embodiment)
In the radio-controlled timepiece 1, the planar antenna 10 is used as an antenna for receiving satellite radio waves. As such a planar antenna, an inverted F-type antenna, a planar monopole antenna, or the like can be employed.

FIG. 8 is a perspective plan view of a radio-controlled timepiece according to a modification.

The radio-controlled timepiece 2 differs from the radio-controlled timepiece 1 in that it has a planar antenna 15 instead of the planar antenna 10 . The configurations and functions of the constituent elements of the radio-controlled timepiece 2 other than the planar antenna 15 are the same as those of the constituent elements of the radio-controlled timepiece 1 denoted by the same reference numerals, and therefore detailed descriptions thereof are omitted here.

9(a) is a perspective view of the planar antenna 15, and FIG. 9(b) is a plan view of an equivalent model of the planar antenna shown in FIG. 9(a).

The planar antenna 15 has a base material 16, an antenna electrode 17, and a feeding point 18. Similar to the planar antenna 10, the planar antenna 15 receives satellite radio waves that carry information including time information indicating time, data from an external device, and the like. receive a signal. In this embodiment, the planar antenna 15 is described as a planar monopole antenna. The base material 16 is a rectangular parallelepiped member made of a dielectric material, and the antenna electrode 17, the feeding electrode 191, and the GND electrode 192 are arranged on the surface thereof. The antenna electrode 17 is mostly arranged on the surface 16a of the base material 16 facing the windshield 93, and is made of metal having a rectangular shape when viewed from above. The antenna electrode 17 includes a first side 171 near the inner peripheral wall of the body 94, a fourth side 174 opposite to the first side 171, and a second side extending from each end of the first side 171 to the fourth side 174. 172 and a third side 173 .

In this embodiment, the first side 171 of the antenna electrode 17 is formed so as to cover up to a portion in contact with the side surface 16b of the base material 16, and is connected to the feeding electrode 191 and the GND electrode 192 arranged on the side surface 16b. . The feeding electrode 191 is arranged so as to be connected to the central portion of the first side 171, and is directly connected to the antenna electrode 17 in the case of the direct feeding method as shown in FIG. 9(a). A connection position between the feeding electrode 191 and the antenna electrode 17 corresponds to the feeding point 18 . The GND electrode 192 is arranged at the end of the first side 171 (the position where the first side 171 intersects with the second side 172 and the third side 173 ) and provides a contact with the GND of the circuit board 92 .
With such a configuration, current generated by receiving external radio waves or current supplied via the feeding point 18 flows intensively in the second side 172 and the third side 173 .
Further, as in the previous embodiment, in the digital display device 50, when the time display section 70 is viewed from above, at least a part of the first side 171 and the fourth side 174, which are a pair of sides of the antenna electrode 15, overlap each other. are arranged to Here, it is arranged so as to overlap both the first side 171 and the fourth side 174 . Furthermore, when the time display section 70 is viewed in plan, the electrode arrangement area 58 is arranged so as not to overlap with either the second side 172 or the third side 173 of the planar antenna 15 .

In the present embodiment, the antenna electrode 17 is arranged on the surface 16a of the substrate 16. However, depending on the wavelength of radio waves received by the planar antenna 15, the first side 171 of the antenna electrode 17 is arranged. may be arranged extending to the area of the side surface 16b. In that case, the connecting portion between the feeding electrode 191 on the side surface 16 b and the first side 171 of the extended antenna electrode 17 corresponds to the feeding point 18 . Also, the arrangement direction of the long sides of the digital display portion is the same as in the previous embodiment.

The length L ₁ of the first side 171 and the fourth side 174 is preferably adjusted to a length corresponding to half the wavelength of the radio waves to be received, and the lengths of the second side 172 and the third side 173 are respectively It is desirable to adjust _L2 to a length corresponding to 1/4 wavelength of the received radio wave. Since the base material 16 is made of a dielectric material as in the planar antenna 10, the physical length of one side can be shortened by the wavelength shortening effect according to the dielectric constant of the dielectric material.

Further, in the radio-controlled timepiece 1, the X driver 53 and the Y driver 54 are arranged in the electrode arrangement area 58, but in the radio-controlled timepiece according to the embodiment, the X driver 53 and the Y driver 54 are arranged in the electrode arrangement area. 58 may be located outside.

Further, in the radio-controlled timepiece 1, the digital display unit 51 is arranged so as not to overlap the battery 82, but in the radio-controlled timepiece according to the embodiment, the digital display unit 51 may be arranged so as to overlap the battery 82. good. By arranging the digital display section 51 so as to overlap the battery 82, the size of the digital display section 51 can be further increased.

Further, in the radio-controlled timepiece 1, the digital display unit 51 is arranged near the hour mark indicating 9 o'clock, but in the radio-controlled timepiece according to the embodiment, the digital display unit 51 is arranged near the hour mark indicating 6 o'clock. , may be positioned as desired.
Radio waves to be received are not limited to GPS. BLE (Bluetooth (registered trademark) Low Energy) or NFC (Near Field Communication) may be used.

Reference Signs List 1, 2 radio clock 10, 15 flat antenna 11, 16 base material 12, 17 antenna electrode 13, 18 feeding point 40 control section 50 digital display device 51 digital display section 52 electrode 58 electrode arrangement area (area)
70 time display part 94 body 121 first side 122 second side 123 third side 124 fourth side

Claims (7)

a torso including a hollow region;
a time display unit that is housed in the hollow region of the barrel and displays the time;
A first side arranged on the opposite side of the time display section to the side on which the time is displayed and close to the inner peripheral wall of the case, and a second side facing the first side and arranged in a direction away from the inner peripheral wall of the case. a planar antenna having a rectangular antenna electrode including four sides and second and third sides connecting each end of the first side and each end of the fourth side;
a control unit;
a digital display unit arranged in the time display unit in plan view and including a digital display unit that displays information based on a signal output from the control unit and an electrode connected to the digital display unit;
The digital display device is arranged so that at least a portion thereof overlaps with the planar antenna when viewed in plan, and the digital display section and the electrodes do not overlap with the second side and the third side ,
The digital display device further includes a display substrate mounted with a display control circuit for transmitting signals output from the digital display section and the control section to the digital display section,
The display substrate is arranged so as to overlap both the first side and the fourth side when the time display section is viewed from above.
A radio clock characterized by: The shape of the digital display unit is rectangular,
2. The radio-controlled timepiece according to claim 1, wherein said digital display device is arranged such that the long sides of said digital display portion are parallel to said second side and said third side. The time display unit has a dial on which at least a first mark that is an hour mark indicating 3 o'clock and a second mark that is an hour mark indicating 9 o'clock are displayed,
3. The radio-controlled timepiece according to claim 2, wherein said digital display device is arranged such that the long side of said digital display portion is parallel to the extending direction of a line connecting said first mark and said second mark. 4. The radio-controlled timepiece according to claim 3, wherein said digital display device is arranged near said second mark. the display substrate is a flexible substrate connected to the control unit via a curved portion;
2. The radio-controlled timepiece according to claim 1 , wherein said curved portion is arranged outside said digital display portion when said time display portion is viewed from above. 6. The radio wave according to any one of claims 1 to 5 , further comprising a solar cell that is arranged so as not to overlap the digital display section when the time display section is viewed from above, and that generates power by irradiated external light. clock. 7. The radio-controlled timepiece according to claim 1 , wherein a feeding point of said planar antenna is arranged at a position closer to said first side or said fourth side than said second side or said third side. .

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