JPS602637B2 - Rate adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rate adjustment device for automatically adjusting the rate of a watch or the like.

In recent years, with the development and diversification of clocks, electronic clocks equipped with power batteries and using highly stable oscillators such as tuning forks or crystals have replaced pure mechanical clocks with balance springs that use a mainspring as a driving source. It has been considered and has already been put into practical use.

This type of electronic timepiece uses a pulse motor to drive the hands of the timepiece in response to the high-frequency signal from the vibrator, or displays the information digitally using a light emitting diode, liquid crystal, or the like. When detecting the rate of an electronic watch using these vibrators, the conventional method is to detect the mechanical leakage vibration of the vibrator using a microphone, etc.; There are methods of detecting magnetic flux electromagnetically, electrostatically or optically for watches using light emitting diodes and liquid crystals, etc. When adjusting the rate, the trimmer capacitor configured in the oscillation circuit is manually adjusted using a driver or the like so that the detection signal obtained by these detection methods matches the reference frequency signal. However, when rate adjustment is performed manually as in the above-mentioned conventional method, the capacitance of the human body is affected and accurate compromise cannot be performed. Furthermore, since the adjustment operation must take into account the influence of the capacitance of the human body, there is a problem that the adjustment is troublesome and time-consuming. The present invention has been made in view of the above points, and an object of the present invention is to provide a rate adjustment device that can automatically, quickly and reliably adjust the rate.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking as an example the case where it is applied to an electronic timepiece using a crystal resonator.

In the figure, 1 is an electronic watch that has a crystal oscillator with a good water level in its oscillation circuit, and 12 is an original vibration detector that detects the original vibration of the watch 11 using, for example, a magnetostrictive element. . The output signal of the original vibration detector 12 is multiplied by, for example, a 100-pin transmitter 13, and then sent to a crossing counter 14. Further, a reference frequency signal generated by a reference frequency generator 15 is applied to the crossing counter 4. The frequency of this reference signal is, for example, the value obtained by multiplying the reference frequency of the clock 11 by the multiplier of the multiplier 13, which is set to 32.768 MHz in this embodiment.
The crossing counter 4 includes a reference frequency generator 15
It is detected how many days z the frequency of the signal output from the multiplier 13 deviates in either the positive or negative direction with respect to the reference signal given from the multiplier 13. A signal indicating the frequency difference detected by the crossing counter 14 is sent to a comparator 16.
This comparator 16 has four output terminals 16a to 1, for example.
6b, if the input signal is a signal indicating a frequency difference of 300Hz or more, a "1" signal is output from the output terminal 16a, and if the input signal is a signal indicating a frequency difference of 30 dishes z to 10 dishes z, the output terminal 16a is output. 16b outputs a “1” signal (lo misaki z ~ 5
If the signal indicates the frequency difference of the cape z, the output terminal 16c outputs “
If the signal indicates a frequency difference of less than 50 ships, a "1" signal is output from the output terminal 16d.

Output terminals 16a to 16c of the comparator turtle 6
The signals outputted from the AND circuits 17a to 17a are respectively
7c, and these AND circuits 1
Pulse signals having different frequencies are applied from the pulse generator 18 to the other input terminals of 7a to 17c. The frequencies f, , f2, and f3' of the pulse signals applied to the AND circuits 17a to 17c are set in a relationship such that f,>f2>f3. And the AND circuit 17
The output signals of a to 17c are the pulse motor drive control circuit 1.
9 as a drive signal. Further, to this pulse motor drive control circuit 19, a signal indicating the shift direction of the difference frequency outputted from the crossing counter 14 is applied as a signal indicating the driving direction of the motor, and a signal indicating the direction of deviation of the difference frequency outputted from the crossing counter 14 is applied as a signal indicating the driving direction of the motor. The output signal is added as a stop signal. The pulse motor 20 is drive-controlled by the pulse motor drive control circuit 19. This pulse motor 20' rotationally drives a rotation mechanism 21 provided to rotate a movable electrode of a trimmer capacitor of an oscillation circuit that includes a portion to be adjusted of the timepiece 11, such as a crystal oscillator. Next, the operation of the apparatus of the present invention configured as described above will be explained.

First, the watch 11, which is the object to be adjusted, is placed in a predetermined position with the back cover open, so that the rotary machine 28 can rotate and adjust the movable electrode of the trimmer capacitor provided in the oscillation circuit within the watch blade. Set it in place. When the clock 11 is not adjusted, the oscillation circuit of the clock turtle 1 outputs 3247
An original vibration signal of 68±△f kHz is output, and this original vibration signal is detected by the original vibration detector 12. The original vibration signal detected by the original vibration detector turtle 2 is multiplied by 1000 times by the multiplier turtle 3 and applied to the crossing counter 14. and reference frequency generator 1
5 and the reference signal frequency output from multiplier 1.
It is detected whether the output signal frequency of No. 3 deviates in the positive or negative direction with respect to the reference signal frequency and supplies it to the pulse motor drive control circuit 19.
is detected and supplied to the comparator 16. The comparator 16 outputs a "1" signal from one of the output terminals 16a to 6d in response to the signal from the crossing counter 14. Normally, in the state before adjustment, the difference △f between the reference signal frequency and the output signal frequency of the interrupter 13 is large and is more than 30 degrees, so that the output end 16a of the comparator blade 6
1'' signal is output and supplied to the AND circuit 17a.

As a result, among the pulse signals output from the pulse generator 18, the highest frequency f. The pulse signal of AND circuit 1
It is sent to the pulse motor drive control circuit 19 via 7a. This pulse motor drive control circuit 19 controls the pulse motor 2 by a signal given from the crossing counter 14.
0 and determines the rotational drive direction of the pulse motor 20 according to the frequency pulse signal output from the AND circuit 17a.
drive the rotation. Due to the operation of the pulse motor 20, the trimmer capacitor for adjusting the source vibration in the timepiece 11 is rotated by a predetermined angle via the rotation mechanism 21, and the source vibration frequency is adjusted at a high speed. In this case, the relationship between the output of the crossing counter 14 and the pulse motor driving direction of the pulse motor disturbance control circuit 19 is set in advance so that the source vibration frequency approaches the reference frequency by adjusting the trimmer capacitor. When the adjustment of the trimmer capacitor causes the monkey vibration frequency to approach the reference frequency and the difference between the output signal frequency of the Liao multiplier 13 and the reference signal frequency becomes less than 300 Hz, the output of the output terminal 16a of the comparator 16 becomes “0
”, the output of the output terminal 16b becomes “1” and the gate of the AND circuit 17b is opened.As a result, the pulse signal with the frequency output from the pulse generator 18 is sent to the pulse motor drive control circuit via the AND circuit 17b. 19. Therefore, the driving frequency of the pulse motor 20 is f,
to f2, and the adjustment speed of the trimmer capacitor becomes slow. Then, the frequency adjustment progresses by adjusting the trimmer capacitor, and when the difference between the output signal frequency of the multiplier 13 and the reference signal frequency becomes less than 10 z, the comparator 1
When the output of the output terminal 16b of 6 becomes "0", the output of the output terminal 1
The output of 6c becomes "1", and the gate of AND circuit 17c is opened. Therefore, the pulse signal of the lowest frequency f3 output from the pulse generator 18 is sent to the pulse motor drive control circuit 19 via the AND circuit 17c. Therefore, the driving frequency of the pulse motor 20 is reduced to f3, and the trimmer capacitor is precisely adjusted at a very slow speed. When the difference between the output signal frequency of the multiplier 13 and the reference signal frequency becomes less than 50 Hz due to the frequency adjustment, the output of the output terminal 16c of the comparator 16 becomes "0" and the output of the output terminal 16d becomes "1". Therefore, the operation of the pulse motor drive control circuit 19 is prohibited.

As a result, the pulse motor 20 is stopped, and the adjustment of the original vibration frequency is completed. During the above adjustment, if the frequency difference △f from the crossing counter changes from the positive direction to the negative direction, the pulse motor drive control circuit 1 is changed from the crossing counter.
9, a command is outputted to rotate the pulse motor in the opposite direction, and the frequency is adjusted so as to approach the reference signal frequency. That is, when the original vibration frequency deviates significantly from the reference, adjustment is performed at a fast speed, and as the adjustment progresses, the motor speed is reduced to perform precise adjustment.

Then, when the difference between the output signal frequency of the multiplier 13 and the reference signal frequency becomes less than 5 discs z, it is assumed that the error of the clock 11 is within a predetermined tolerance range, and the adjustment is completed.

Of course, you may adjust it so that the number of transfer lotus reeds becomes 0. With such a configuration, the rate adjustment can be performed automatically, so that the adjustment can be performed extremely accurately and quickly without being affected by the capacitance of the human body.

In the above embodiment, the original vibration frequency of the body 11 to be adjusted is detected by the magnetostrictive element, but the detection of this original frequency may be performed depending on the type of the body 11 to be adjusted, such as mechanical vibration, leakage magnetic field, leakage electric field, optical This may also be done by detecting physical changes, etc.

Furthermore, in the embodiment described above, as rate adjustment approaches completion, low frequency signals are supplied to the pulse motor drive control circuit 19 to perform minute adjustments. The output is monitored at predetermined time intervals, and the AND circuit 17c is activated depending on the output state.
One pulse signal is obtained from the predetermined time interval, and this pulse signal is supplied to the pulse motor drive control circuit 19,
Fine adjustment may be made by rotating the pulse motor 20 one step at a time. Further, although a pulse motor is used as a drive source for the rotation mechanism, it goes without saying that other sources such as a servo motor may also be used.

Further, in the above embodiment, the original vibration frequency of the object to be adjusted detected by the original vibration detector 12 is multiplied by the multiplier 13, but the detected original vibration frequency is used as it is without being multiplied and is used as the reference frequency. The comparison may be made, or the rate may be adjusted by dividing the detected original frequency and detecting the number of reference signals existing between the divided signals.

．． Furthermore, although the above-mentioned embodiment shows the case of adjusting the rate of a timepiece, the application is not limited to only a timepiece, but can be applied to any body to be adjusted that can be adjusted with respect to a reference frequency, without departing from the gist of the present invention. It can be applied in various ways within this range. As described above, according to the present invention, it is possible to provide a rate adjustment device that can automatically, quickly and reliably adjust the rate.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Adjustment object (clock), 12... Original vibration detector, 15... Reference frequency generator, 14... Crossing counter, 20... Pulse motor, 21... Rotating mechanism.

Claims (1)

[Claims] 1. An adjustment mechanism provided to match the frequency adjustment point of the body to be adjusted and driven by a pulse motor, an original vibration detector that detects the original frequency of the body to be adjusted, and a standard that generates a reference frequency signal. Detection that compares a frequency generator and a reference signal generated by this reference frequency generator with the frequency of the body to be adjusted detected by the vibration detector to detect the difference and direction of shift in the frequency of the body to be adjusted with respect to the reference signal. a pulse signal selection means for selecting one pulse signal from a plurality of pulse signals of different frequencies based on a difference in frequency of the body to be adjusted detected by the detection means; 1. A rate adjusting device comprising: means for driving a pulse motor of the adjusting mechanism based on the pulse signal and the direction of deviation in the frequency of the adjusted body detected by the detecting means.