JPH0339686A - Function inspecting device of electronic timepiece - Google Patents

Abstract

PURPOSE:To exactly measure a driving pulse width by calculating the driving pulse width of a step motor from the timing data of the min. value and max. value of the level data which samples the detection signal of leak magnetic fluxes. CONSTITUTION:The leak magnetic fluxes during motor driving of the electronic timepiece are converted by a detecting coil 5 to electric signals which are then amplified 6. The leak magnetic flux detecting waveforms subjected to the influence of wheel trains are binarized by a window comparator 7 to generate 15 a sampling clock. The leak magnetic flux detecting waveform which is the output of an amplifier 6 is converted 16 to a digital value in synchronization with the clock. The digital value is stored together with the count value of a counter 18 in an FIFO 20. The data of the detected level stored in the FIFO 20 and the count value of this time are read out by a CPU 22 and the max. value and min. value of the detected level are retrieved. The driving pulse width is calculated from this count value, by which the driving pulse width is exactly measured without receiving the influence of the wheel trains and step motors.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a functional test of an electronic timepiece that measures the drive pulse width of a step motor of an electronic timepiece using magnetic flux generated from the step motor of the electronic timepiece.

[Summary of the invention]

The present invention provides a device for testing the function of an electronic timepiece by detecting leakage magnetic flux of a drive pulse that drives a step motor of an electronic timepiece, in which timing data and level data of a detection signal are sampled, and the level data obtained by sampling the detected signal. By determining the maximum and minimum values of the data and calculating the drive pulse width of the step motor of the electronic clock from the timing data of the maximum and minimum values, it is possible to accurately This allows the drive pulse width to be calculated in a timely manner.

[Conventional technology]

Conventionally, as shown in FIG. 4, detection is performed using a detection coil 5.

The waveform (hereinafter, the waveforms of each part are shown together in the waveform diagram in Figure 3, and the numbers are indicated as 3-1 to 8) is obtained by converting the leakage magnetic flux of the clock motor drive waveform 3-1 into an electrical signal. , a leakage flux detection waveform 3-2 is obtained, which is amplified by the amplifier 6,
A window comparator output 3-3 to be binarized is obtained by the window comparator 7, and a rising detection output 3-4 is obtained by the rising detection circuit 8, and the two signals of the rising detection output 3-4 are The driving pulse width of the timepiece was measured by counting the width using a counter 9 and a pulse width calculating circuit 10.

[RM that the invention attempts to solve]

However, in the conventional technology, the watch motor drive waveform 3-1 is affected by changes in the load on the wheel train of the watch body, and the waveform obtained by converting the leakage magnetic flux into an electric signal by the detection coil 5 is
The leakage magnetic flux detection waveform affected by the gear train becomes like 3-5, and the output of the window comparator 7 becomes like the window comparator output 3-6 affected by the gear train. There is a problem in that it is often impossible to accurately measure the pulse width of the original watch motor drive waveform 3-1 simply by inputting it to the detection circuit 8.

[Purpose of the invention]

In contrast, the present invention aims to provide a detection device that can measure the pulse width of a watch motor drive pulse without error even when the leakage magnetic flux is affected by load fluctuations in the wheel train of a watch body. The purpose is

[Means to solve the problem]

Therefore, in order to solve these conventional problems, the present invention provides a detection coil that converts the magnetic flux generated when the step motor of an electronic watch is driven into an electrical signal, and an amplifier that amplifies the electrical signal output from the detection coil. a window comparator that binarizes the electrical signal No. 13 amplified by the amplifier; a sampling clock generation circuit that generates a sampling clock during the true period of the output binarized by the window comparator; and the amplifier. an A/D converter that converts the electrical signal outputted by the A/D converter into digital data; a detection level storage circuit that stores the digital data of the A/D converter; a counter that runs freely based on a reference clock; A counter value storage circuit that stores the data in synchronization with the digital data storage of the D converter, and a maximum value/minimum value detection circuit that detects the maximum value and minimum value from the data of the detection level storage circuit and the data of the counter value storage circuit. By calculating the width of the step motor drive pulse of an electronic watch from the obtained maximum value data and minimum value data, it is possible to realize a device that measures the pulse width excluding the influence of load fluctuations of the wheel train of the watch body. be.

[Effect]

To explain the relationship between the operation and effect of the present invention, an A/D converter and a level storage circuit are provided to sample the output level of the amplifier, and from the output of the window comparator,
a sampling clock generation circuit that generates a periodic clock for sampling; a count storage circuit that stores a counter value in synchronization with sampling performed by the A/D converter and the level storage circuit; the level storage circuit and the count storage; The maximum and minimum values are detected from the data stored in the circuit. By using the bottom of the tank to calculate the pulse width from the pulse width calculation circuit based on the output of the maximum value/minimum value detection circuit, it is possible to accurately measure the pulse width by eliminating the influence of load fluctuations in the wheel train of the watch body. I made it.

〔Example〕

In the function testing device for an electronic timepiece that operates as described above, first, the basic configuration is explained using the block diagram in FIG. 1 and the waveform diagram in FIG. When the leakage flux affected by the gear train is converted into an electric signal by the detection coil 5, a leakage flux detection waveform 3-5 affected by the gear train is obtained.

This is input to the window comparator 7 to obtain the window comparator output A3-6. When this is input to the sampling clock generation circuit 15, a sampling clock 3-7 is output. When the output of the amplifier 6 is used to operate the A/D converter 16 and the level storage circuit 17 and the detection level data is sampled using the sampling clock 3-7, sampling level data 3-8 is obtained. Further, the count value of the counter 18 is stored in the count storage circuit 18 in synchronization with the sampling level data 3-8 by the sampling clock 3-7. Here, the maximum value/minimum value detection circuit 19 detects the counter data of the maximum value and minimum value of the detection level from the data stored in synchronization with the level storage circuit 10 and the count storage circuit 18, and the pulse width calculation circuit 10 detects the counter data of the maximum value and minimum value of the detection level. The pulse width is calculated from the difference between the counter data of the maximum value and the minimum value of the detection level.

The maximum and minimum values of the leakage flux detection waveform 3-5 converted into an electric signal by the detection coil 5 are the watch motor drive waveform 3.
It has been experimentally shown that this corresponds to the rising and falling times of -1, so even in the leakage flux detection waveform when the wheel train load fluctuates, the drive pulse width of the clock motor can be accurately measured. can do.

Next, embodiments of the present invention based on the above-described basic configuration will be described with reference to the drawings. In the block diagram of FIG. 2, leakage magnetic flux when driving the motor of an electronic timepiece is converted into an electric signal by a detection coil 5, and amplified by an amplifier 6.

The leakage flux detection waveform 3-5 affected by the wheel train amplified by the amplifier 6 is binarized by the window comparator 7, and the sampling clock generation circuit 15 generates the sampling clock 3-7. In synchronization with this sampling clock 3-7, the leakage flux detection waveform 3-5 affected by the gear train, which is the output of the amplifier 6, is
The D converter 16 converts it into a digital value, and the counter 1
It is stored in the FIFO 20 along with the count value of 8. P
The CPU 22 reads the detection level data and the count value at that time stored in the IF020, searches for the maximum and minimum values of the detection level, and calculates the width of the drive pulse from the maximum and minimum count values. By this,
It is possible to measure the exact pulse width.

〔Effect of the invention〕

As explained above, this invention detects the leakage magnetic flux when the step motor of an electronic watch is driven, samples the timing data and level data of the detection signal, and calculates the maximum and minimum values of the sampled level data, By calculating the drive pulse width of the step motor of the electronic clock from the timing data of the maximum value and minimum value,
This method has the effect of accurately measuring the drive pulse width without being affected by the wheel train or step motor of an electronic clock.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the basic configuration of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a waveform diagram showing waveforms of each part, and Fig. 4 is a diagram of a conventional inspection device. It is a block diagram. 5...Detection coil 6...Amplifier 7 ・ ・ 8 ・ ・ 9 ・ ・ 1O ・ 15 ・ 16 ・ 17 ・ 19 ・ 20 ・ 21 ・ 22 ・ 3-1 3- 2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. ・Window comparator・Rising edge detection circuit・Counter・Pulse width calculation circuit・Sampling clock generation circuit・A/D converter・Count memory circuit ・Maximum value/minimum value detection circuit ・FIFO ・CPU path ・CPU ・Watch motor drive waveform ・Leakage flux detection waveform ・Window comparator output ・Rising detection output ・Leakage flux detection waveform affected by gear train ・Window comparator output A ・Sampling clock ・Sampling level data or more 2 CPU The great surprise of the present invention 910 7 cedar 0 evil 2nd figure 6 Iku's ``J-shaped closed wS 3 figure

Claims (1)

[Claims] A detection coil that converts leakage magnetic flux when driving a step motor of an electronic clock into an electrical signal, an amplifier that amplifies the electrical signal output from the detection coil, and a window comparator that binarizes the electrical signal amplified by the amplifier. ,
a sampling clock generation circuit that generates a sampling clock during a true period of the output binarized by the window comparator; an A/D converter that converts the electrical signal output by the amplifier into digital data; a detection level storage circuit that stores digital data of the converter; a counter that is self-running based on a reference clock; a counter value storage circuit that stores the counter value in synchronization with the digital data storage of the A/D converter; and the detection level storage circuit. The width of the step motor drive pulse of the electronic watch is calculated from the maximum value data and minimum value data obtained by the maximum value/minimum value detection circuit which detects the maximum value and minimum value from the circuit data and the data of the counter value storage circuit. 1. A functional testing device for an electronic watch, comprising a pulse width calculation circuit.