JPS5866887A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To eliminate the error in time displaying when strong shock is applied by detecting the rotating directions and the rotation or non-rotation of a rotor when the rotor is rotated by signals others than normal pulse signals and driving the rotor so as to correct the same. CONSTITUTION:A rotation detecting circuit 10, a rotating direction detecting circuit 11 and a control circuit 12 are provided to the driving circuit 7 of a motor 8, whereby an electronic timepiece is constituted. In the circuit 7, an induced voltage is generated in the terminals A, B at both ends of a coil according to the rotation of a rotor and the voltage at the point A in this time differs in the height of the 1st crest of the waveform thereof between rotation and non- rotation but the shapes thereafter differ as well; therefore the circuit 10 detects said shapes. When the rotor is rotated by shock from the outside, the voltage waveform at the point B generated by said rotation differs in forward and backward rotations; therefore the circuit 11 detects the rotating directions from which of the potentials at the point A and the point B is higher. The circuit 12 applies the pulses opposite from the polarity of the normal pulses to the rotor when the rotor rotates in a delayed direction thereafter the circuit applies the normal pulses thereto so as to correct the rotation to eliminate the delay.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece that detects the rotation of a step motor when it is not being driven, and performs a stop drive in response to the detection.

Analog electronic watches generally apply an electrical input pulse pw as shown in FIG. 1 to the coil 1 of a two-pole step motor shown in a perspective view in FIG. There is. The FW in Figure 1 is usually 4.91@s
! This is an extremely short pulse of about 1e. In contrast, the pulse interval T is very long, and in a 1-second movement clock, ?
= 1 sec, 50 second movement? =50 seconds. In this way, the step motor of an analog electronic watch is only driven during short FW periods, and is not driven most of the time. The reason why the rotor remains at a fixed position when it is not driven is due to the magnetic potential energy generated by the rotor, stator, and coils. A wheel train meshes with the rotor, and a minute hand, 9-hour hand, etc. for time display is attached to one end of the wheel train. When the step motor is not driven, when a stroke is applied to a needle, etc., the rotational force is transmitted to the rotor via the wheel train, and when the rotational force exceeds the index torque from p to y, the rotor is rotated. For example, if the rotor rotates 180 degrees in the direction of time delay due to a clock, the rotor cannot be rotated by the next drive pulse T seconds later with the sepolar step motor shown in Figure 2, so the clock is (
2XT) becomes a companion for seconds. Conventional electronic watches have not taken any measures against this phenomenon. In other words, in order to prevent this kind of phenomenon from occurring, the index torque of the rotor should be strengthened and the primary moment of the needle should be reduced so that the index torque of the four-wheel drive is greater than the rotational force caused by the lock. I was doing it. However, to increase the index torque of the rotor, it is necessary to apply input power that overcomes the torque during driving.In electronic watches aiming for low power consumption, the index torque of the rotor must be reduced and the external One of the challenges was to make it resistant to shocks.

Furthermore, reducing the primary moment of the needle is a design constraint, which hinders the ability to meet the diverse demands of consumers.

The present invention was made to eliminate the above-mentioned drawbacks, and provides a watch that does not display time incorrectly even when the watch is subjected to strong stress that we often encounter when carrying it. be.

Hereinafter, the present invention will be explained in detail based on examples.

Figure 3 shows the motor drive circuit, A and B at both ends of the coil.
An induced voltage is generated at the terminals according to the rotation of the rotor. As shown in FIG. 4, the position of the magnetic poles of the rotor 3 is
It is assumed that the main magnetic flux is at rest at a position rotated by θ. At this time, the rotation of the rotor is 2 in the counterclockwise direction and 2 in the forward direction.
Assume that the clockwise direction is reverse rotation. Figure 5 (11>) shows a state in which an external shock is applied to the watch and the rotor is rotating.The solid line shows the case where the rotor receives a strong shock and rotates 1800 degrees in the normal direction from its initial resting position. shows,
The dashed line shows the case of non-rotation with a small stamp.

In general, when there is a large impact force from the outside, the impact time is extremely short and there are many simple equilibrium waves.Even if a complex equilibrium wave is input, the rotor will not be able to follow the double impact wave. When the Moon rotates, it rotates in an extremely short period of time. The fifth figure represents the induced voltage at point A at this time.
Figure (&).

The height of the induced voltage at the time of the - roll is different between rotation and non-rotation, but the induced voltage after that is also different.

FIG. 6(a) shows the rotational state of the rotor when the rotor responds in the reverse direction due to an external force. Similar to normal rotation, the solid line indicates rotation, and the broken line indicates non-rotation. No. 6N (4) indicates the induced voltage at one point at this time. In this way, to know whether the rotor has started rotating in the forward direction or in the reverse direction,
This can be determined by determining which potential is higher at point A or point B at both ends of the coil in section T. Also, whether it rotated or did not rotate due to external pressure is determined by 1 to 4 to 3.
T! This can be seen by the difference in induced voltage up to the 5th level. However, in the case of Fig. 5 (h) and Fig. 6 (1), the induced voltage itself is low and the difference is not clear, so it is amplified as shown in Fig. Performing detection.

FIG. 8 is a diagram of the splitter of the present invention. 4 is an oscillation circuit,
5 is a frequency dividing circuit, 6 is a waveform synthesis circuit, 7 is a drive circuit, 8 is a motor, 9 is a wheel train indicating mechanism, 10 is a circuit for detecting rotation or non-rotation, 11 is a rotation direction detection circuit, and 12 is a detection circuit. This is a control circuit that receives signals from the circuit and performs rotation correction.

FIG. 9 shows a portion of the important drive circuit, rotation detection circuit, and rotation direction detection circuit in the present invention.

FIG. 10 shows a part of the detection circuit. FIG. 11 shows a timing chart of the input/output terminals in FIG. 9 and FIG. 10. ! 1
7 signals are connected through the inverter 50.
It is connected to the T input of the lip 70 tube (hereinafter abbreviated as ν·1) 51.

The Q output of the Tff-IF 51 is connected to the second power of the WAND gate 52 and the second power of the NAMD gate 60. NA) The other input of the ITD gate 52 is connected to the 0 terminal. A pulse obtained by synthesizing the pulses shown in the timing chart of FIG. 10 by a waveform synthesis circuit is applied to the 0 terminal. Mata AND gate 60
The first input terminal of is connected to the B terminal, and one terminal is a 2KHz signal of the frequency divider circuit. Also, 'j? -751 Q
The output is 1 (the first power of AND gate 53 and WAND
It is connected to the second human power at gate 58. The second power of the WAND gate 55 is connected to the 0 terminal, and the first power of the page HD gate 58 is connected to the B terminal. 1iA)fD
The output of gate 58 is passed through inverter 54.55 to
It is connected to the gate of PO3711+τ6S, and the output of NkMD gate 53 is connected to P through inverter 56.57.
MO! It is connected to the game F of the 1-character code 65. NAN
The output of II gate 58 is connected to 11 through inverter 59.
Connected to the gate of MO5111T64, and A
6MAID connected to the first power of ND gate 60
The output of the gate 60 is passed through the inverter 62 to
It is connected to the gate of 81FI'f'66 and also to the first input of MuIID gate 67.

The other input of AND game) 60.67 is connected to the terminal. The terminal signal is a signal to mask detection so that rotor rotational vibration is not detected when the rotor rotates on the hour, and it distinguishes between rotor rotation at the hour and rotor rotation at times other than the hour. There is. this! The period of time shall be at least 20 inertias in consideration of rotor rotational damping vibration. AN])Ge-)60(F) output is PMO3FIC
The output of the AND gate 67 is connected to the gate of 2M0871-71. 2M
Is the drain of 081FET63 NMO8? Connected to the drain of IT64 and connected to NM via resistor 73
Connect to the drain of O8FET+68, and coil 7
4 is connected to the negative input inverter 7B of the comparator 77.

The drain of PMO81FICT65 is 111M081
It is connected to the drain of FE〒66, and the resistor 72
NMO8F] is connected to the drain of ItT71 via NMO8F], and is further connected to the other end of the coil 74, the negative input of the comparator 75, and the inverter 76. Inverter 7
6.78 works as a comparator with a controlled threshold, and when the rotor starts to rotate due to external shock, it detects this and works as a rotation direction detection circuit by configuring it with other circuits. Comparator 77.7
The positive input of 0MM08νmT82 is connected to terminal G, and the positive input of 0MM08νmT82 receives the reference voltage divided by resistor 80.81. The output terminal G shown in FIG. 10 is connected to the terminal G. This MO8? ItT82 is shown in Figure 7? , when the start of movement is detected, mask a certain section,
The reference voltage is applied only between 78 and the positive input of comparator 77 and 75. Detection inverter 7
The outputs of 8°76 are input to exclusive circuits 0R89 and 86 via inverters 79 and 85, respectively.

The outputs of exclusive 0R89 and 86 are R-81 respectively.
Connected to the set input of F-IF92.91. R
-The q output of S2 192 is connected to the value input of exclusive 0R86, and the Q output of R81-191 is connected to the other input of exclusive 0R89. Here, the direction of the coil 74 in which the signal is detected is detected and determined. Further, the other output of R8F-IF92 is connected to the input of OR gate 95 and the input of AND gate 105. The output of R8F-IF91 is connected to the input of OR gate 93 and the input of AND gate 98, and the output of OR gate 93 is connected to one terminal in FIG. What about the E terminal? - Connected to the D input of the 7126,
512 of terminal J is connected to the O input of F-IF121, 123.
A Hz signal is input from a frequency divider circuit. IF-F12
For 1,125 hundred man power, inverter 1. IQ, 122
The J terminal is input via. ? Q output of -7121 goes to D input of 1-'11125? The Q output of -7123 is connected to the D input of IF-IF125, and is also connected to the second input of Al1D gate 156 via inverter 126.
The terminal K is input to the C input 12 of 8, 130, and 132. A 256 Hz signal is connected to terminal X from a frequency dividing circuit. Also, P-IF125, 128, 130, 1
Inverters 124, 127, 129 are connected to the i input of 52.
, via 151! The terminal signal is connected. The Q output of Sea7125 is the D input of F-Ff28, F-71
What is the q output of 3[1? -7132's D input and the first input of the NOR gate 154, and the output of the Sea 1152 is connected to the second input of the NOR gate 134 and the inverter 13.
3 to the first input of AND gate 135. AII) Gate 135 exit cover, M III Game M
56, and its output becomes terminal G.

This terminal G is input to the gate of MMO 882 in FIG. The other input terminal of the WAND gate 85 receives an input signal from the input terminal which is a 1Hg signal, and the NA
The other input terminal of the 11D gate i8 is the 1H of the Ajll child.
A z signal is input via an inverter 90. 11
The output of kHD gate 85.87 is connected to inverter 84.8
7 to a comparator 7577. The output of the comparator 77 is the first output of the AND gate 94, and the output of the comparator 75 is the output of the NAND gate 95.
Connected to the first power of. The jHz signal of the A terminal is connected to the other input of the NAND gate 95, and the WAND
The IHg signal of the A terminal is connected to the first input terminal of the gate 94 via the inverter 90 . HAMD gate 9
The output of 4 is latched by VOR game) 101°102. Also, the output of the HAND gate 95 is a MOR game)
At 99,100? I'm being teased. NOR gate 100
The terminal F connected to the first power of ,102 is @10
Full? This signal resets the latch.

The output of NOR gate 102 is connected to inverter 103.10.
4 to the second input of AND gate 105.

The output of NOR gate 100 is connected to the second input of AND gate 98 via inverter 97.96. A
The output of the ND gate 1o5 becomes the H terminal.

The output of AND gate 98 becomes the output terminal. These terminals H and I can detect whether the detection voltage is generated in P or Q of the coil, and also know from the output of the inverter 104.96 whether or not it has rotated. It is easy to correct the drive using the control circuit based on the signal. For example, if the rotor rotates in the delayed direction, at the next regular timing, apply a pulse with the opposite polarity to the regular pulse, and then apply the regular pulse. However, it is possible to correct it so that there is no delay.

As described above, in the present invention, when the four-wheeler rotates using a signal other than the regular pulse signal applied to the motor, the direction of rotation and whether or not it has rotated is detected.

In order to perform this correction drive, it is possible to create a watch with no difference in the indication of the hands even when the index torque of the motor is reduced, and it is also possible to reduce the index torque of the motor, resulting in lower power consumption of the motor. leading to In addition, there is an effect that there is no need to limit the size of the minute hand in a 30-second movement watch, a 1-minute movement watch, or the like.

[Brief explanation of the drawing]

FIG. 1 shows an example of conventional motor drive pulses. FIG. 2 shows a perspective view of a step motor used in the present invention. FIG. 3 shows an example of a motor drive circuit. FIG. 4 shows the relationship between the stator 2 and the magnets of the rotor 3. Figure 5 shows the rotation angle of the rotor (a) and the induced voltage generated at one end of the coil (b), and Figure 6 shows the rotation angle of the rotor (,x) and the induced voltage generated at the other end of the coil, similar to Figure 5. The induced voltage (&
) is shown. FIG. 7 shows an example of the induced voltage in the coil according to the present invention. FIG. 8 is a block diagram of the present invention, and FIGS. 9 and 10 show an embodiment of the circuit according to the present invention. FIG. 11 shows a timing chart of the input/output terminals in FIGS. 9 and 10. 1... Coil 2... Stator 3... Rotor 4... Oscillation circuit 5... Frequency dividing circuit 6... Waveform synthesis circuit 7... Drive circuit 8... Motor 9... Wheel train indicating mechanism 10... Rotation detection circuit 11... Rotation direction detection circuit 12 ...Control circuit 50.54, 55, 56, 57, 59, 62, 79°8
3.84, 87, 90, 96, 97, 105, 104.
120, 122, 124, 127, 129, 131. 133.126...Inverter 76.71-...
...Detection inverter 52, 55, 58, 85, 88
,95.94...MAIID circuit 59.60.98,105,155,156...
・Mu MD circuit 77, 75...Comparator 86, 89...-IXOR circuit 93...
・OR circuit 99.100, 101.102.134 River...HOR
Circuit 51...Te IF -191,92・
...R-81-1 121, 123, 125, 128, 150, 1! $2・
...,...D-IF-1 72,73,80,81...Resistance 74...
...Coil 65.65...PMO8F Tobi! 64.66.6
B, 71.82...-M M O8?
IC? A, B, O, D, l, 7. G, H, Eng, J, K
・・・・・・Indicates person and output terminal. Applicant Kinsha Daini Seikodai Agent, Patent Attorney Mogami, Figure 1 Figure 2 Figure 3 btr and Figure 4 Figure 5 ((11) Figure 5 (shi) Figure 6 (α) Figure 6(b) Figure 8

Claims (1)

[Scope of Claims] 1) An electronic timepiece comprising at least an oscillation circuit, a nine-frequency divider circuit, a waveform synthesis circuit, a drive circuit, a motor, and an indicating mechanism, further comprising a rotation detection circuit and a rotation direction detection circuit, A waveform synthesis circuit is generated by the signal from the detection circuit.
An electronic timepiece characterized by having a control circuit that controls a drive circuit. 2. The electronic timepiece according to claim 1, characterized in that the rotation detection circuit and the rotation direction detection circuit prohibit rotation detection and rotation direction detection when a signal is output from the drive circuit on the hour. electronic clock. 3) 4. In the electronic watch described in claim 1,
An electronic timepiece characterized in that a rotation detection circuit and a rotation direction detection circuit are configured to be operated by an induced voltage of a motor.