JP3601297B2 - Electronically controlled mechanical clock - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention converts the mechanical energy of a mechanical energy source such as a mainspring into electric energy by a generator, and activates a rotation control means by the electric energy to control the rotation cycle of the generator, thereby providing a wheel. The present invention relates to an electronically controlled mechanical timepiece that accurately drives a pointer fixed to a row.
[0002]
[Background Art]
The mechanical energy when the mainspring is opened is converted into electrical energy by the generator, and the electrical energy is used to operate the rotation control means to control the value of the current flowing through the coil of the generator, thereby fixing it to the wheel train. 2. Description of the Related Art There is known an electronically controlled mechanical timepiece that accurately drives a pointer to be displayed and accurately displays time.
[0003]
As a speed control method in an electronically controlled mechanical timepiece, the present applicant inputs a reference signal from a time standard source composed of a quartz oscillator and a rotation detection signal detected with the rotation of a generator to an up / down counter. In addition, a speed control method for performing brake control of the generator when the value of the up / down counter reaches a set value has been devised.
[0004]
In this speed control method, as shown in the conventional example in the conceptual diagram of FIG. 4, when the rotation cycle of the generator is slower than the reference signal cycle, the brake control is not performed. When the brake is not applied, the mechanical energy of the mainspring is set so that the rotation cycle of the generator is faster than the reference signal cycle. Therefore, if the brake is not applied, the rotation cycle returns to the reference signal cycle.
[0005]
If the brake control is not performed as it is, the rotation cycle of the generator will be faster than the reference signal cycle. For example, if the rotation detection signal is up-count input and the reference signal is down-count input, Also, the input of the rotation detection signal increases, and the value of the up / down counter gradually increases. When this value exceeds a set value, the generator is braked and controlled.
[0006]
As shown in FIG. 4, the set value for applying the brake is a delay amount when the rotation cycle of the generator is slower than the reference signal cycle (a straight line representing the reference signal cycle and a portion that is slower than that). The area S1 surrounded by the curve and the advance when the state was earlier than the reference signal cycle (the area S2 surrounded by the straight line representing the reference signal cycle and the curve earlier than that). Must be set so as to cancel each other and become the reference signal period. For this reason, conventionally, the brake is applied after the rotation cycle becomes somewhat earlier than the reference signal cycle, and control is performed so that the time until the return to the reference signal cycle is slower and earlier is almost the same. .
[0007]
[Problems to be solved by the invention]
However, in such a control, the speed can be adjusted to the reference signal cycle in a relatively short time, but on the other hand, the speed difference f1 between the time when the rotation cycle is the slowest and the time when the rotation cycle is fast, that is, the fluctuation amount of the hand movement is relatively small. There was a problem of becoming large.
[0008]
An object of the present invention is to provide an electronically controlled mechanical timepiece that can reduce the amount of wobbling of the hands.
[0009]
[Means for Solving the Problems]
An electronically controlled mechanical timepiece according to the present invention includes a mechanical energy source, a wheel train driven by the mechanical energy source, and electric energy generated by the mechanical energy source transmitted through the wheel train. An electronically controlled mechanical timepiece comprising: a generator to be supplied; a pointer coupled to the wheel train; and rotation control means driven by the electric energy to control a rotation cycle of the generator. A rotation detection unit that detects a rotation period of the generator and outputs a rotation detection signal corresponding to the rotation period; a reference signal generation unit that generates a reference signal based on a signal from a time standard source; An up-down counter in which one of a rotation detection signal and a reference signal is input as an up-count signal and the other is input as a down-count signal; Period comparing means for comparing the period with the reference signal period to detect that the rotation period is earlier than the reference signal period, and the value of the up / down counter becomes the first set value and the period comparison means When it is detected that the cycle is earlier than the reference signal cycle, a first brake control for applying a brake to the generator for a preset time at a predetermined timing, and a value of the up / down counter is set to a first value. Braking control means for performing a second brake control having a braking force greater than that at the time of the first brake control when a second set value larger than the first set value is obtained from the set value. Things.
[0010]
The electronically controlled mechanical timepiece of the present invention drives the hands and the generator with a mechanical energy source such as a mainspring, and applies a brake to the generator by the braking control means of the rotation control means to reduce the rotation speed of the rotor, that is, the hands. Govern.
[0011]
Here, the rotation control means of the generator determines that the value of the up / down counter that counts the reference signal from the reference signal generation means and the rotation detection signal from the rotation detection means becomes a predetermined first set value, and that the cycle comparison If the means detects that the rotation cycle is earlier than the reference signal cycle, a first brake control for applying a brake to the generator for a preset time at a predetermined timing is performed.
[0012]
If the control is performed only by the value of the up / down counter, the delay due to the state where the rotation cycle is slow as shown in the conceptual diagram of the conventional example in FIG. Until the end, the brake cannot be applied, and the rotation cycle increases.
[0013]
In the present invention, not only the value of the up / down counter but also the rotation cycle and the reference signal cycle are compared, so that the brake can be applied immediately after the rotation cycle becomes earlier (shorter) than the reference signal cycle. As the brake control at this time, the brake is applied to the generator for a predetermined time at a predetermined timing, that is, intermittently, so that the braking force can be reduced as compared with the case where the brake is continuously applied. Therefore, as shown in the conceptual diagram of the present invention in FIG. 4, when the rotation cycle becomes earlier than the reference signal cycle, a relatively weak brake can be applied earlier, so that an increase in the speed of the generator is suppressed. be able to. For this reason, the difference f2 between the minimum value and the maximum value of the speed of the rotation cycle, that is, the amount of wobbling of the hand movement can be reduced. In this case, the areas S1 and S2 are almost the same.
Further, the brake control means, the value of the up-down counter, when it becomes the second set value larger than the first set value from the first set value, is greater braking force than during the first brake control It is set to perform the second brake control. The second brake control may be, for example, a control that continues to apply a brake to the generator while the value of the up / down counter is equal to or greater than the second set value.
Depending on the balance between the torque of the mainspring and the braking force of the first brake control, the rotation cycle may be gradually advanced even if the first brake control is performed. In such a case, if the second brake control with a larger braking force is performed, it is possible to surely suppress an increase in the rotation cycle and to further reduce the wobbling amount of the hand movement.
[0014]
At this time, the cycle comparing means includes a reset circuit that outputs a reset signal in accordance with the rotation detection signal, counts a signal of a fixed cycle, and resets the count value when the reset signal is input. A counter that outputs a signal when a signal for a reference signal period is counted before a reset signal is input; and a brake set circuit that outputs a brake set signal in response to a signal from the counter. It is preferred that
[0015]
As the cycle comparing means, a means for detecting a rotation cycle, storing the data in a memory or the like, and comparing it with reference signal cycle data can be employed. Cost can also be reduced.
[0018]
Further, it is preferable that the timing of applying the brake during the first brake control is set in accordance with the timing at which the rotation detection signal is input to the up / down counter.
[0019]
If the brake timing is set to the input timing of the rotation detection signal, the number of brakes per predetermined time can be increased if the rotation cycle is short and the input interval of the rotation detection signal is short, When the cycle is slow and the input interval of the rotation detection signal is long, the number of brakes is reduced, so that appropriate brake control according to the rotation cycle can be performed.
[0020]
Further, the rotation control means includes a switch capable of short-circuiting both ends of the generator, and the braking control means applies a brake signal including a rectangular wave pulse to the switch to turn on and off the switch. It is preferable that the generator is configured to be brake-controllable in that the configuration can be simplified and the cost can be reduced.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a block diagram showing an electronically controlled mechanical timepiece according to an embodiment of the present invention, and FIG. 2 is a circuit diagram thereof.
[0023]
The electronically controlled mechanical timepiece includes a mainspring 1 as a mechanical energy source, a speed increasing train wheel 3 for transmitting the torque of the mainspring 1 to a generator 2, and a hand 4 connected to the speed increasing wheel train 3 to display time. And
[0024]
The generator 2 is driven by the mainspring 1 via the speed increasing train 3 to generate induced power and supply electric energy. The AC output from the generator 2 is rectified through a rectifier circuit 5 including step-up rectification, full-wave rectification, half-wave rectification, transistor rectification, and the like. Supplied.
[0025]
The generator 2 is connected to a brake circuit 7 including a transistor 7A and a diode 7B, which are switching elements shown in FIG. 2, and controls the brake circuit 7 to short-circuit both ends of the generator 2 to short-circuit. The speed of the generator 2 can be adjusted by applying a brake. It is desirable that the brake circuit 7 has a circuit configuration using a diode having a small forward voltage as the diode 7B.
[0026]
The brake circuit 7 is controlled by a rotation control unit 10 driven by electric power supplied from a power supply circuit (capacitor) 6. The rotation control means 10 includes an oscillation circuit 11, a rotation detection means 20, and a control circuit 30, as shown in FIG.
[0027]
The oscillation circuit 11 outputs an oscillation signal (32768 Hz) using a quartz oscillator 11A which is a time standard source, and this oscillation signal is divided into a certain period by a frequency dividing circuit 12 comprising 12 flip-flops shown in FIG. Be circulated. The output Q12 at the twelfth stage of the frequency dividing circuit 12 is output as the 8 Hz reference signal fs. Therefore, the oscillation circuit 11, the crystal oscillator 11A, and the frequency divider 12 constitute a reference signal generator 15.
[0028]
The rotation detecting means 20 includes a waveform shaping circuit 21 connected to the generator 2. The waveform shaping circuit 21 includes an amplifier, a comparator, a filter, and the like, and outputs a rotation detection signal FG1 from which a sine wave is converted into a rectangular wave to remove noise.
[0029]
The control circuit 30 includes a braking control unit 40, a cycle comparison unit 50, an up / down counter 60, and a synchronization circuit 70.
[0030]
The rotation detection signal FG1 of the rotation detecting means 20 and the reference signal fs from the reference signal generating means 15 are input to the up-count input and the down-count input of the up-down counter 60 via the synchronization circuit 70, respectively.
[0031]
The synchronization circuit 70 includes four flip-flops 71 and an AND gate 72, and detects the rotation by using the signal of the fifth-stage output Q5 (1024 Hz) or the sixth-stage output Q6 (512 Hz) of the frequency divider 12. The signal FG1 is synchronized with the reference signal fs (8 Hz), and adjustment is performed so that these signal pulses are not output overlapping.
[0032]
The up / down counter 60 is constituted by a 4-bit counter. A signal based on the rotation detection signal FG1 is input from the synchronization circuit 70 to an up-count input of the up-down counter 60, and a signal based on the reference signal fs is input from the synchronization circuit 70 to a down-count input. Thus, the counting of the reference signal fs and the rotation detection signal FG1, and the calculation of the difference therebetween can be performed simultaneously.
[0033]
The up / down counter 60 is provided with four data input terminals (preset terminals) A to D. When an H level signal is input to the terminals A, B, and D, the up / down counter 60 Is set to the counter value “11”.
[0034]
The LOAD input terminal of the up / down counter 60 is connected to an initialization circuit 8 that is connected to the power supply circuit 6 and outputs a system reset signal SR according to the voltage of the power supply circuit 6.
[0035]
Since the up / down counter 60 does not accept an up / down input until the system reset signal SR is output, the counter value of the up / down counter 60 is maintained at “11”.
[0036]
The up / down counter 60 has 4-bit outputs QA to QD. These outputs QA to QD are input to the line decoder 65.
[0037]
In the line decoder 65, outputs Y0 to Y15 corresponding to the counter values “0” to “15” of the up / down counter 60 are provided. The outputs of Y0 and Y15 of the line decoder 65 are input to the NAND gate 61 to which the output from the synchronization circuit 70 is input. Therefore, for example, when a plurality of input of the up-count signal continues and the counter value becomes “15” and the L-level signal is output from Y 15, even if the up-count signal is further input to the NAND gate 61, the input is not changed. Are set so that the up-count signal is not input to the up-down counter 60 any more. Thus, the counter value is set so as not to exceed “15” and become “0” or to exceed “0” and become “15”.
[0038]
The outputs Y12 to Y15 of the line decoder 65 are connected to a NAND gate 80 as a second brake signal generating means. In the line decoder 65, one of the selected outputs goes to L level and the other 15 outputs go to H level. By connecting the outputs Y12 to Y15 to the NAND gate 80, one of these outputs is output. Is selected, that is, when the counter value of the up / down counter 60 is "12" to "15", an H level signal is output as the brake signal BKS2, and when the counter value is "11" or less, the L level signal is output. A signal is output.
[0039]
The brake signal BKS2 is input to the NOR gate 41, and the brake signal BKS1 output from the NOR gate 41 is input to the gate of the Pch transistor 7A. Therefore, when the counter value of the up / down counter 60 becomes "12" to "15", the brake signal BKS2 becomes an H level signal and the brake signal BKS1 from the NOR gate 41 becomes an L level signal, so that the transistor 7A is turned on. , And the generator 2 is short-circuited to apply a brake.
[0040]
The output CK of the flip-flop 43 is connected to the output Y9 of the line decoder 65 via the inverter gate 42. The output Y12 is connected to the CLR input of the flip-flop 43 via the inverter gate 42.
[0041]
Since an H level signal is always input to the D input of the flip-flop 43, when the count value of the up / down counter 60 becomes “9” and an L level signal is input from Y9, the Q level of the flip-flop 43 is An H level signal is output from the output. Then, the Q output of the flip-flop 43 is maintained at the H level until the counter value becomes “12” and the L level signal is input from Y12, and is reset when the counter value becomes “12”, and the Q output becomes This is an L level signal.
[0042]
The Q output of the flip-flop 43 is input to an AND gate 44. On the other hand, the cycle comparing means 50 includes a decimal counter 51, a reset circuit 52, and a brake set circuit 53.
[0043]
The decimal counter 51 receives the output Q8 (64 Hz) of the frequency dividing circuit 12 and counts its pulse signal.
[0044]
The reset circuit 52 includes a flip-flop 54 and an AND gate 55, and is configured to output a reset signal to the decimal counter 51 and the brake set circuit 53 when the rotation detection signal FG1 is input.
[0045]
The brake set circuit 53 includes two flip-flops 56 and 57, and is configured to output a brake set signal (H level signal) to the AND gate 44 when the output Q6 of the decimal counter 51 is input.
[0046]
That is, since the decimal counter 51 starts counting the 64 Hz pulse after the reset signal is input from the reset circuit 52, the decimal counter 51 counts the seventh pulse (for the period of the reference signal of 8 Hz). When there is no reset signal (input of the rotation detection signal FG1), a signal is output from the output Q6.
[0047]
Therefore, when the input cycle of the rotation detection signal FG1 is later (longer) than the reference signal cycle (8 Hz), an H level signal is output from the output Q of the flip-flop 56. On the other hand, when the input cycle of the rotation detection signal FG1 is earlier (shorter) than the reference signal cycle (8 Hz), the reset signal is input before the output Q6 is output, so that the output Q of the flip-flop 56 is at the L level. Maintained at the signal.
[0048]
The output from the flip-flop 57 changes in accordance with the up-count signal FG2 from the synchronization circuit 70 and is output with the D input inverted, so that when the output Q of the flip-flop 56 is an H level signal, An L-level signal is output to the AND gate 44, and an H-level signal is output to the AND gate 44 in the case of an L-level signal. Accordingly, from the brake set circuit 53 of the cycle comparing means 50, an H level signal is input to the AND gate 44 if the rotation cycle of the generator 2 is earlier than the reference signal cycle, and an L level signal is inputted to the AND gate 44 if the rotation cycle is later. Is input to
[0049]
To the decimal counter 51, a flip-flop 46 and an AND gate 47 as the first brake signal generating means 45 of the braking control means 40 are connected. The first brake signal generating means 45 is configured to receive the rotation detection signal FG1 and the output Q2 of the decimal counter 51 and output a rectangular wave pulse signal having a predetermined width to the AND gate 44.
[0050]
Accordingly, as shown in FIG. 3, the output ANS of the AND gate 44 is such that the output of the line decoder 65 is between Y9 and Y11, the output from the flip-flop 43 is an H level signal, and the output ANS of the rotation detection signal FG1 is When the cycle is earlier than the reference signal cycle and the output from the brake set circuit 53 of the cycle comparison means 50 (output from the flip-flop 57) becomes an H level signal, the brake from the first brake signal generation means 45 A signal is output.
[0051]
At this time, since the signal BKS2 from the NAND gate 80, which is the second brake signal generating means, remains at the L level signal, the signal ANS is inverted and output as the brake signal BKS1, and the brake circuit 7 supplies the signal to the generator 2 in a predetermined manner. A first brake control for applying a short brake at intervals is performed.
[0052]
On the other hand, when the value of the line decoder 65 becomes equal to or more than Y12, an L level signal is output from the flip-flop 43, so that the signal ANS is maintained at L level, the signal BKS2 is inverted as it is and output as the brake signal BKS1, The generator 2 is controlled by the brake circuit 7 to apply a brake. Since the brake is continued until the output of the line decoder 65 becomes equal to or less than Y11, the second brake control is performed by continuously inputting a brake having a stronger braking force than the brake between Y9 and Y11.
[0053]
Therefore, in this embodiment, the NOR gate 41, the inverter gate 42, the flip-flop 43, the AND gate 44, the flip-flop 46 of the first brake signal generating means 45, the AND gate 47, the line decoder 65, and the second brake signal generating means are used. A certain NAND gate 80 constitutes the braking control means 40.
[0054]
According to this embodiment, the following effects can be obtained.
[0055]
(1) The rotation control means 10 compares the value of the up / down counter 60 to which the rotation detection signal FG1 and the reference signal fs are input with the output of the cycle comparison means 50 for comparing the cycles of the rotation detection signal FG1 and the reference signal fs. Since the first brake control is performed using the first brake control, the brake control can be performed immediately after the rotation cycle of the generator 2 becomes earlier than the reference signal cycle. In addition, in the first brake control, the generator is braked for a predetermined time at a predetermined timing, that is, intermittently, so that the braking force can be weakened as compared with a case where the brake is continuously applied.
[0056]
For this reason, as shown in the present invention of FIG. 4, when the rotation period becomes earlier than the reference signal period, a relatively weak brake can be applied earlier, so that the maximum speed of the rotation period can be suppressed. The difference f2 between the minimum value and the maximum value of the speed of the rotation cycle, that is, the amount of wobbling of the hands can be reduced. For this reason, it is possible to provide a high-quality timepiece with less fluctuation of the hands.
[0057]
{Circle around (2)} Further, when the rotation cycle of the generator 2 is advanced and the counter value of the up / down counter 60 becomes “12” or more even when the first brake control is performed, the rotation control means 10 performs the first brake control. Since the second brake control having a larger braking force can be performed as compared with the control, the braking control can be reliably performed, and the increase in the rotation of the generator 2 can be suppressed, and the wobbling amount of the hand operation can be further reduced. .
[0058]
{Circle around (3)} The cycle comparing means 50 is composed of a decimal counter 51, a reset circuit 52, and a brake set circuit 53, and a memory for storing the rotation cycle of the generator 2 and the reference signal cycle can be made unnecessary. Can be simplified and the cost can be reduced.
[0059]
(4) The up-count signal FG2 is input to the clock input of the flip-flop 57 of the brake set circuit 53, and the timing for applying the brake during the first brake control is set in accordance with the timing at which the rotation detection signal is input to the up-down counter. Therefore, if the rotation cycle is shortened and the input interval of the rotation detection signal is shortened, the number of brakes per predetermined time can be increased, and the rotation cycle is delayed and the rotation detection signal is input. When the interval is long, the number of brakes can be reduced. Therefore, appropriate brake control according to the rotation cycle can be performed.
[0060]
(5) The rotation control means 10 includes a brake circuit 7 having a transistor 7A capable of short-circuiting both ends of the generator 2. The braking control means 40 applies a brake signal composed of a rectangular pulse to the transistor 7A. Since the generator 2 is brake-controlled by turning on and off the transistor 7A, the configuration of the brake circuit 7 can be simplified and the cost can be reduced.
[0061]
(6) Since the 4-bit up / down counter 60 is used, 16 count values can be counted. Therefore, when the up-count signal is continuously input, the input value can be accumulated and counted, and the set value for performing the first brake control and the set value for performing the second brake control are changed by a certain width. Can be set in the range with. Therefore, even when the up-count signal and the down-count signal are continuously input, the first brake control and the second brake control can be performed to some extent continuously, and the speed control is reliably and stably performed. Can be.
[0062]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
[0063]
For example, in the embodiment, the 4-bit up / down counter 60 is used, but an up / down counter of 3 bits or less may be used, or an up / down counter of 5 bits or more may be used. If an up / down counter having a large number of bits is used, the countable value increases, so that the range in which the accumulated error can be stored can be increased, and control particularly immediately after the start of the generator 2 or the like is advantageous. On the other hand, if a counter having a small number of bits is used, the range in which the accumulated error can be stored becomes small, but there is an advantage that the cost can be reduced.
[0064]
Further, the specific configurations of the brake circuit 7, the brake control means 40, the cycle comparison means 50, the synchronization circuit 70, and the like are not limited to those of the above-described embodiment, and may be appropriately set in implementation. In particular, the braking control means 40 is not limited to the one using the line decoder 65 or the like, and may be configured to grasp and control the counter value by directly using the outputs QA to QD of the up / down counter 60, for example.
[0065]
Furthermore, when the mainspring torque or the like is set so that the rotation cycle of the generator 2 can be suppressed only by the first brake control, the configuration for the second brake control, that is, the NAND gate 80 or the like is not provided. You may.
[0066]
【The invention's effect】
As described above, according to the electronically controlled mechanical timepiece of the present invention, there is an effect that the wobbling amount of the hands can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a main part of an electronically controlled mechanical timepiece according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a configuration of the electronically controlled mechanical timepiece of the embodiment.
FIG. 3 is a timing chart showing brake control according to the embodiment.
FIG. 4 is a conceptual diagram showing a brake control method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mainspring 2 Generator 3 Speed-up train wheel 4 Hand 5 Rectifier circuit 6 Power supply circuit 7 Brake circuit 7A Transistor 8 Initialization circuit 10 Rotation control means 11 Oscillation circuit 11A Quartz vibrator 15 Reference signal generation means 20 Rotation detection means 21 Waveform shaping Circuit 30 Control circuit 40 Brake control means 45 First brake signal generation means 50 Period comparison means 51 Decimal counter 52 Reset circuit 53 Brake set circuit 60 Up / down counter 65 Line decoder 70 Synchronization circuit 80 NAND as second brake signal generation means Gate

Claims (4)

A mechanical energy source, a wheel train driven by the mechanical energy source, a generator for supplying electrical energy generated by the mechanical energy source transmitted through the wheel train, An electronically controlled mechanical timepiece comprising: a coupled pointer; and rotation control means driven by the electric energy to control a rotation cycle of the generator.
The rotation control means detects a rotation cycle of the generator, and outputs a rotation detection signal corresponding to the rotation cycle, rotation detection means,
Reference signal generating means for generating a reference signal based on a signal from a time standard source;
An up-down counter in which one of the rotation detection signal and the reference signal is input as an up-count signal, and the other is input as a down-count signal;
Cycle comparing means for comparing the rotation cycle of the generator with a reference signal cycle to detect that the rotation cycle is earlier than the reference signal cycle,
When the value of the up / down counter reaches the first set value and the cycle comparison means detects that the rotation cycle is earlier than the reference signal cycle, the generator is set for a predetermined time at a predetermined timing. A first brake control for applying a brake to the vehicle, and when the value of the up / down counter becomes a second set value that is larger than the first set value from the first set value, the braking force is higher than in the first brake control. Braking control means for performing a second brake control having a large
An electronically controlled mechanical timepiece comprising: 2. The electronically controlled mechanical timepiece according to claim 1, wherein the period comparison unit includes:
A reset circuit that outputs a reset signal in accordance with the rotation detection signal,
A counter that counts a signal of a fixed period and resets the count value when the reset signal is input, and outputs a signal when a signal for a reference signal period is counted before the reset signal is input; ,
A brake set circuit that outputs a brake set signal in response to a signal from the counter;
An electronically controlled mechanical timepiece comprising: 3. The electronically controlled mechanical timepiece according to claim 1, wherein a timing of applying a brake during the first brake control is set in accordance with a timing at which a rotation detection signal is input to an up / down counter. 4. Electronically controlled mechanical clock. The electronically controlled mechanical timepiece according to any one of claims 1 to 3 , wherein the rotation control means includes a switch capable of short-circuiting both ends of the generator, and the braking control means controls the switch from a rectangular wave pulse. An electronically controlled mechanical timepiece, wherein the generator is brake-controllable by applying a brake signal and turning on and off a switch.

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