JPH0656420B2 - Electronic clock - Google Patents

Description

The present invention relates to an improvement of an electronic timepiece having a load compensation function.

[Prior Art] Conventionally, an electronic timepiece having a load compensation function as shown in FIG. 2 has been proposed. (For example, JP-A-59-13538
7) In FIG. 2, 1 is an oscillation circuit, 2 is a frequency dividing circuit,
The reference signal P ₀ output from the oscillator circuit 1 is applied to the frequency divider circuit 2
The frequency division signal is output by a frequency division signal with various division ratios. Reference numeral 3 denotes a hand movement pulse generation circuit, which receives the frequency division signal from the frequency division circuit 2 and outputs a motor drive hand movement pulse P _S having a pulse width of 3 mS. Reference numeral 4 denotes a strobe pulse generation circuit, which receives the frequency-divided signal from the frequency-dividing circuit 2 as an input and outputs a strobe pulse P having a pulse period of 1 mS from a timing 3 mS after the end of the hand movement pulse P _S.
Only output _stb 8 shots. 5 driver circuit, 6 is a motor coil, movement pulse P _S of the motor driving signal P to a terminal of the motor coil 6 from the movement pulse generating circuit 3
Output as _m alternately. Further, the driver circuit 5 _puts the output terminal on the side where the hand movement pulse P _S is output by the strobe pulse P _stb into a high impedance state,
Generate an induced voltage. 7 is an induced voltage detection circuit,
The induced voltage from the driver circuit 5 is detected, and when the induced voltage is detected, the detection signal _PK is output. 8 is NOR
A set-reset type flip-flop (hereinafter referred to as RS-FF) composed of gates 8a and 8b, which outputs a permission signal P _C when the hand movement pulse P _S is set to the NOR gate 8a. to continue. The permission signal P _C is the detection signal P _K from the induced voltage detection circuit 7.
Is input to the NOR gate 8b and reset to stop. Reference numeral 9 denotes a correction pulse generating circuit, which receives the frequency-divided signal from the frequency dividing circuit 2 as an input and corrects the correction pulse P _f having a pulse width of 5 mS from 30 mS after the end of the output of the hand moving pulse P _S in the hand movement pulse generating circuit 3.
Is output. Reference numeral 10 is a control circuit, which is the RS-FF8.
The correction pulse P _f is transmitted via the control circuit 10 only when the permission signal P _C from the driver circuit 6 is input.
Input to the motor coil 6 and the motor drive signal P is input to the terminal of the motor coil 6.
It is output as _m .

Next, the operation of the electronic timepiece having the above structure when the motor normally rotates will be described with reference to the time chart shown in FIG.

The reference signal P ₀ output from the oscillating circuit 1 is divided by the frequency dividing circuit 2 to become frequency dividing signals with various frequency division ratios, which are supplied to the hand movement pulse creating circuit 3, the strobe pulse creating circuit 4, and the correction pulse creating circuit 9. Input, respectively Fig. 3
The hand movement pulse P _S , the strobe pulse P _stb, and the correction pulse P _f are output at the timings shown in (a), (b), and (f). When the hand movement pulse P _S is output from t1 to t2 in FIG. 3 (a), the motor drive signal P _m is output via the driver 5 as shown in FIG. The pulse P _S is the NOR gate 8 of the RS-FF8.
also input to a, starts outputting the timing of the enable signal P _C is as shown in FIG. 3 (e) C0. Note that Fig. 3 (c)
Is a waveform of the coil current I _m flowing through the motor coil 6, and has various damping vibration waveforms depending on the rotation state of the motor as described later. In FIG. 3 (c), L ₀ is a reference line serving as a reference of the detection level, and the section (indicated by diagonal lines) in which the coil current _Im is below the reference line L ₀ is the strobe pulse P _stb. Is a detection condition section in which the detection signal P _K is generated by. The waveform shown in FIG. 3 (c) is the coil current I _m when the motor rotates normally, the damping oscillation starts at the point t2 where the motor drive pulse P _m ends, and the reference line L starts from the second cycle. _It attenuates around ₀ . The strobe pulse S1~S8 shown in FIG. 3 (b) is set to a timing that covers the second period of the damped oscillation of the coil current I _m.

Therefore, at the timing of S1 to S8, when the strobe pulse P _stb is generated from the strobe pulse generation circuit 4 and is input to the driver circuit 5 and one end of the motor coil 6 is set to a high impedance state, S1, S2, S2.
At the timings 3 and S8, the coil current I _m has a detection condition section indicated by diagonal lines, so that an induced voltage is generated, and K1, K2, K3, and K3 are generated as shown in FIG. 3 (d).
At the timing of 8, the detection signal P _K is output from the induced voltage detection circuit 7.

On the other hand, since the detection pulse _{P K} at the timing of K1 in FIG. 3 (d) is input to the NOR gate 8b of the RS-FF8, RS-FF8 by timing C1 in FIG. 3 (e) is reset , the output enable signal _{P C} is stopped. As a result, since the permission signal P _C is no longer input to the control circuit 10, the correction pulse P _f output from the correction pulse generating circuit during f9 to f10 in FIG. 3 (f).
Are prohibited by the control circuit 10 and are not supplied to the driver circuit 5.

That is, when the third view (c) the coil current, such as shown in I _m flows through the motor coil 6, it is assumed that the motor rotates normally by detecting the induced electric, the correction pulse P _f to the motor coil 6 Do not output.

Next, the operation of the circuit in the case where some heavy load occurs in the rotation of the motor and the motor does not rotate due to the hand movement pulse P _S will be described with reference to the time chart shown in FIG.

Timings of the hand movement pulse P _S , the strobe pulse P _stb, and the correction pulse P _f shown in FIGS. 4 (a), (b), and (f) are the same as those shown in FIGS. 3 (a), (b), and (f). It is the same as the timing in. In FIG. 4 (a), when the hand movement pulse P _S is output during t1 to t2, the motor drive signal P _m is output via the driver circuit 5 as shown in FIG. 4 (g), and The hand movement pulse P _S is the NOR gate 8 of the RS-FF8.
also input to a, starts outputting the timing of the enable signal P _C is as shown in FIG. 4 (e) C0. Note that Fig. 4 (c)
The coil current I _m shown in FIG. 2 is a waveform when the motor does not rotate due to a heavy load, and is present below the reference line L ₀ immediately after the time t2 when the motor drive pulse P _m ends, but again. It will be on the upper side soon. For this reason,
(b), the in strobe pulse P timing _stb S1 to S8 generated, becomes outside the detection condition section. Therefore, no induced voltage is generated and the detection signal P _K is not generated from the induced voltage detection circuit 7. Therefore RS-F
F8 is not reset by the detection signal P _K permission signal P
_C remains output. Hence enabling signal P _C to the control circuit 10 is input, the correction pulses output at the timing of f9~f10 the correction pulse generating circuit from FIG. 4 (f), via the control circuit 10 The driver circuit 5 outputs a motor drive pulse _Pm to the motor coil 6 as shown in FIG. 4 (g) to correct and drive the motor.

That is, when the fourth coil current I _m such as shown in Figure (c) flows through the motor coil 6, it is assumed that the motor than that induced voltage is not generated at the timing of the strobe pulse P _stb does not rotate, the correction pulse P _f is the motor drive signal P _m
Is output, and the motor is rotated.

As described above, in the conventional example shown in FIG. 2, the rotation state of the motor is judged based on the occurrence of the induced voltage at the timing of the strobe pulse _Pstb , and the hand movement pulse is generated only when the induced voltage is not generated at all. In P _S , it was determined that the motor did not rotate and a correction pulse P _f having a pulse width longer than the hand movement pulse P _S was output to rotate the motor to correct the pointer position.

[Problems to be solved by the invention]

In the conventional electronic timepiece having the load compensation function, when the motor does not rotate due to the hand movement pulse due to a heavy load, the correction pulse _Pf is used to rotate the motor to correct the hand position. The reason why it does not occur is that it may occur when a strong magnetic field is applied to the watch in addition to the heavy load described above. The operation in the magnetic field in the conventional example shown in FIG. 2 will be described with reference to the time chart shown in FIG.

Timings of the hand movement pulse P _S , the strobe pulse P _stb , and the correction pulse P _f shown in FIGS. 5 (a), (b), and (f) are the same as those in FIGS. 3 and 4 (a), (b), and FIG. The timing is the same as in (f). When the hand movement pulse P _S is output from t1 to t2 in FIG. 5 (a), the motor drive signal P _m is output via the driver circuit 5 as shown in FIG. The hand movement pulse P _S is also input to the NOR gate 8a of the RS-FF 8, and the permission signal P _C starts to be output at the timing of C0 as shown in FIG. 5 (e). Note that Fig. 5 (c)
The coil current I _m indicated by is a waveform when the motor does not rotate due to the influence of the external magnetic field. While the strobe pulse P _stb generated at the timing of S1~S8 in FIG. 5 (b) is a high impedance state one end of the motor coil 6 is input to the driver circuit 5, the motor does not rotate due to the influence by the external magnetic field As a characteristic of the time, the coil current waveform I _m in FIG. 5 (c) is gradually attenuated from the time t2 when the motor drive pulse P _m ends, but the coil current waveform I _m of the strobe pulse P _stb in FIG. 5 (b) is reduced. The detection condition section is present only for a short period near the timing of S3. Therefore, the detection signal P _K is generated from the induced voltage detection circuit 7 at the timing of K3 in FIG.
The enable signal P is input to the NOR gate 8b of the S-FF8.
_C is reset at the timing of C3 and its output is stopped. Therefore, the correction pulse P _f is the driver circuit 5 which is prohibited by the control circuit 10 f9~f10 output between that shown in FIG. 5 (f) is not supplied.

As described above, in the special environment such as the magnetic field, it is considered that the motor is normally rotated even though the motor is not normally rotated, and the correction pulse P _f is used as the motor drive signal P _m to generate the motor coil 6 There was a problem that it was not applied to the.

The object of the present invention is to eliminate the above-mentioned conventional problems,
An object of the present invention is to provide an electronic timepiece with a load compensating circuit that outputs a correction pulse _Pf to the motor coil 6 when the motor does not rotate even in a special environment such as an external magnetic field and corrects the pointer position correctly.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configuration. That is, the electronic circuit according to the present invention includes a reference frequency oscillation circuit, a frequency division circuit that divides a signal from the reference frequency oscillation circuit and outputs a frequency division signal, and based on the frequency division signal, a hand movement pulse and a correction pulse motor. A pulse generation circuit that generates a pulse, and a strobe pulse that generates multiple strobe pulses to temporarily set the output terminal of the motor driver to a high impedance to detect the generation of the induced voltage in the motor coil after the hand movement pulse is output. A creation circuit, an induced voltage detection circuit that detects the occurrence of an induced voltage at the timing of the strobe pulse and generates a detection signal, and the correction pulse when the operation of the pulse motor by the hand movement pulse is not normally performed. In an electronic timepiece having a motor compensating circuit for outputting and compensating the operation of the pulse motor, the detection signal is continuous. It is characterized by controlling the output of the correction pulse by a signal a continuous pulse detection circuit for detecting the formed the continuous pulse detection circuit that a constant number generated Te.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an electronic timepiece showing an embodiment of the present invention. In FIG. 1, the same elements as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 1, parts different from those in FIG. 2 will be described. Reference numeral 20 is a continuous pulse detection circuit, which is an OR gate 21, a counter 22, and a setting circuit 2.
3, a coincidence circuit 24 and a counter reset 25. The counter 22 is reset when the hand movement pulse P _S from the hand movement pulse generation circuit 3 is input to the R terminal via the OR gate 21, and the content is reset. Becomes Further, the counter 22 counts the detection pulses _K supplied from the induced voltage generating circuit 7, and when the contents of the counter 22 and the numerical value stored in the setting circuit 23 match, the matching circuit 24 More coincidence signal P
_i is output and input to the NOR gate 8b of the RS-FF8 to reset the RS-FF8. The numerical values stored in advance in the setting circuit 23 in this embodiment are Is. On the other hand, counter reset circuit 25, a reset signal P when the detection signal P _K at the timing when the output of the strobe pulse P _stb is not detected
_r to generate a counter 25 through the OR gate 21.
To reset.

Next, the operation of the electronic timepiece having the above structure when the motor normally rotates will be described with reference to the time chart shown in FIG.

As shown in FIG. 6 (a), when the hand movement pulse P _S is output from the hand movement pulse generation circuit 3 during the period from t1 to t2, the motor drive signal P _m is output to the motor drive signal P _{m in} FIG. 6 (i) via the driver 5. As shown, the hand movement pulse P _S is output as RS-FF.
8 is also input to the NOR gate 8a, the permission signal P _C starts to be output at the timing of C0 as shown in FIG. 6 (g), and the counter 22 is reset via the OR gate 21. The coil current I _m shown in FIG. 6 (c) is shown in FIG. 3 (c).
It is a waveform when the motor rotates normally like the above. Fig. 6
strobe pulse in (b) P _stb is output at the timing of S1 to S8, the detection signal P _K shown in FIG. 6 (d) is outputted at the timing of the induced K1 the voltage detection circuit 7, K2, K3, K8 It The detection pulse P _K is counted by the counter 22, and its contents are changed at the timing of K3 shown in FIG. 6 (d). Therefore, it is the contents of the setting circuit 23. And the coincidence circuit 24 starts to generate the coincidence signal P _{i at} the timing i3 in FIG. 6 (f). The coincidence signal P _i is R
The enable signal P is input to the NOR gate 8b of the S-FF8.
_C stops at the timing of C3 shown in FIG. 6 (g). Further, at the timing of S4 to S7 in FIG. 6 (b), FIG. 6 (d)
Detection for signal P _K is not output, Figure 6 r4~r reset signal P _r is from the counter reset circuit 25 (e)
It occurs at the timing of 7, the counter 22 is reset by this, and the contents are The coincidence signal P _i shown in FIG. 6 (f) stops at the timing of i4. Therefore, the control circuit 10 has the permission signal P _C
Is not entered, so f9 to f in Fig. 6 (h)
The correction pulse P _f output during 10 is the control circuit 10
It is prohibited by and is not supplied to the driver circuit 5.

That is, when the sixth view coil current, such as shown in (c) I _m is when flowing in the motor coil 6, the induced voltage is detected 3 shots continuously at the timing of the strobe pulse P _stb,
In other words, in the waveform of the coil current I _m , it is considered that the motor has rotated normally because the detection condition section continues for 2 mS or more, and the correction pulse P _f is not output to the motor coil 6.

Next, a case where some heavy load occurs in the rotation of the motor and the motor does not rotate due to the hand movement pulse P _S will be described with reference to FIG. 7.

In FIG. 7 (a), when the hand movement pulse P _S is output from the driver circuit 5 as the motor drive signal P _m shown in FIG. 7 (i) during t1 to t2, as shown in FIG. 7 (c). A motor current I _m flows through. The waveform of the motor current I _m is shown in FIG. 4 (c).
This is the same waveform as when the motor did not rotate due to heavy load. While the strobe pulse P _stb shown in FIG. 7 (b) is output at the timing of S1 to S8, the detection signal P _K as shown in FIG. 7 (d) is not outputted, hence the counter 2
The contents of 2 The match circuit 24 does not proceed, and the match signal P _i is not output from the match circuit 24. Therefore, since the remains are allowed signal _{P C} from RS-FF8 output, FIG. 7 correction pulse outputted during f9~f10 the (h) _{P f} is the drive signal P from the driver circuit 5 through the control circuit 10 _It is output as _m and correctively drives the motor.

As described above, the electronic timepiece according to the present invention operates in the same manner as the conventional electronic timepiece shown in FIG. 2 when the motor is normally rotating and when the motor is not rotating due to a heavy load. Next, the operation in the external magnetic field will be described with reference to the time chart shown in FIG.

If during movement pulse of t1~t2 in FIG. 8 (a) is outputted, the coil current I _m illustrated in FIG. 8 (c) flows in the same manner as FIG. 5 (c). As a result, the waveform of the coil current I _m becomes the detection condition section at the timing of S3 of the strobe pulse P _stb shown in FIG. 8 (b) and becomes the detection signal P shown in FIG. 8 (d).
_K is output at the timing of K3. However, since the detection signal P _K is emitted only once at the timing of K3, the coincidence circuit P _i does not output the coincidence signal P _i and the permission signal P _C remains output, so that the eighth Figure (h)
The correction pulse P output during f9 to f10 as shown in
_f is output as the drive signal P _m shown in FIG. 8 (i) to correct and drive the motor.

That is, in the operation in the external magnetic field, when the motor does not rotate, the detection signal P _K is output only once but is not output continuously, so the correction pulse P _f is output as the drive signal P _m. .

In the present invention, the numerical value set in the setting circuit 23 is However, this value is due to the characteristics of the motor,
It is determined by the above-described difference between the width of the detection condition section during normal rotation and the width of the detection condition section during non-rotation due to the influence of the external magnetic field. That is, since the pulse period of the strobe pulse _Pstb is 1 mS, three consecutive shots correspond to 2 mS in time, and it is regarded as normal rotation only when the detection condition section is 2 mS or more. This varies depending on the characteristics of the motor. Therefore, the numerical value to be set in the setting circuit 23 and the generation time and cycle of the strobe pulse _Pstb differ depending on the type of motor, and are not limited to those in the embodiment.

〔The invention's effect〕

As described above in detail, according to the present invention, a continuous pulse detection circuit is added between the induced voltage detection circuit and the RS-FF, and the motor operates only when the detection condition section is longer than a predetermined time. By assuming that the motor has rotated normally, the case where the motor does not rotate due to the influence of the external magnetic field can be determined.

[Brief description of drawings]

FIG. 1 is a block diagram of an electronic timepiece according to the invention, FIG. 2 is a block diagram of a conventional electronic timepiece, and FIGS. 3 to 8 are time charts for explaining the operation. 3 ... Hand movement pulse creation circuit, 4 ... Strobe pulse creation circuit, 5 ... Driver circuit, 7 ... Induced voltage detection circuit, 8 ... Control circuit, 9 ... Correction pulse creation circuit, 10 ... Control circuit, 20 ... Continuous pulse detection circuit.

Claims (1)

[Claims] 1. A reference frequency oscillating circuit, a frequency dividing circuit that divides a signal from the reference frequency oscillating circuit and outputs a divided signal, and a hand movement pulse and a correction pulse of a pulse motor are generated from the divided signal. And a strobe pulse creating circuit that creates a plurality of strobe pulses for temporarily setting the output terminal of the motor driver to a high impedance in order to detect the occurrence of the induced voltage of the motor coil after the hand movement pulse is output. , An induced voltage detection circuit that detects the occurrence of an induced voltage at the timing of the strobe pulse and generates a detection signal, and outputs the correction pulse when the operation of the pulse motor by the hand movement pulse is not performed normally In an electronic timepiece having a motor compensation circuit for compensating the operation of a motor, a counter for counting the number of the detection signals and a constant counter And a matching circuit that outputs a matching signal when the count value of the counter and the set number of the setting circuit match, and a reset signal when a detection signal does not occur at the timing of the strobe pulse Is provided, and a continuous pulse detection circuit configured by an OR circuit for resetting the counter by outputting a logical sum of the hand movement pulse and the reset pulse as inputs, and the continuous pulse detection circuit is provided. An electronic timepiece characterized by controlling the output of a correction pulse by detecting that a fixed number of the detection signals set in a setting circuit have been generated.