JP5207789B2 - Electronic clock - Google Patents

Description

  The present invention relates to an electronic timepiece having a step motor.

  Conventionally, an electronic timepiece employs a method in which a plurality of normal drive pulses are prepared in order to reduce current consumption, and a motor is driven by selecting a normal drive pulse that can always be driven with minimum energy. The selection method will be briefly described. First, a normal drive pulse is output, and then it is determined whether or not the motor has rotated. If it does not rotate, it immediately outputs a correction drive pulse. When the next normal drive pulse is output, the output is switched to the normal drive pulse having a driving force one rank higher than the previous time. When the motor rotates, the same normal drive pulse as the previous time is output when the next normal drive pulse is output. When the same drive pulse is output a predetermined number of times, the normal drive pulse is selected by a method of switching to a normal drive pulse with a driving force that is one rank smaller.

  In the conventional method, the rotation / non-rotation of the rotor is detected by outputting a detection pulse after the application of the normal drive pulse, and abruptly changing the impedance value of the coil of the step motor, and generating the induced voltage generated in the coil. A method of detecting the pattern of the free vibration of the rotor by detecting at the coil end is often used. For example, one of two drive inverters connected to both ends of the coil is first operated as a first detection mode to output a detection pulse, and when a rotation detection signal is generated, the first detection mode is stopped and another drive inverter is The detection pulse is output by operating as the second detection mode, and when the rotation detection signal is generated in the second detection mode, it is determined that the rotation is successful.

  The second detection mode is to detect that the rotation is successful, that is, the rotor has crossed the peak of the magnetic potential. However, before the second detection mode, the first detection mode is relatively This detection is performed to prevent detection of an erroneous detection signal that occurs before the rotor completely exceeds the peak of the magnetic potential when it is driven weakly, and the rotation of the rotor is still finished as shown in FIG. This prevents the waveform of the current waveform c2 from being erroneously detected as a signal exceeding the magnetic potential even though it is not. Therefore, it is known that performing the first detection before the second detection mode is an effective technique for more reliably performing the rotation detection. (For example, see Patent Document 1 and Patent Document 2)

  Hereinafter, the conventional technique will be described with reference to the drawings. FIG. 17 is a block diagram showing a circuit configuration of a conventional electronic timepiece, FIG. 18 is a pulse waveform diagram generated by the circuit of the conventional electronic timepiece, and FIG. 19 is a current waveform and voltage generated in the coil when the rotor can rotate. FIG. 20 is an example of a waveform diagram of current and voltage generated in the coil when the rotor cannot be rotated.

In FIG. 17, 20 is a step motor composed of a coil 9 and a rotor 10, 1 is an oscillation circuit, 2 is a frequency dividing circuit, 3 is a normal drive pulse generating circuit, and the normal drive pulse generating circuit 3 is a frequency dividing circuit. Based on the signal 2, the normal drive pulse SP is output every normal second every 1 ms with a width of 5 ms as shown in FIG. Reference numeral 14 denotes a normal drive pulse selection circuit, which can generate a plurality of normal drive pulses having different effective powers based on determination results of a first detection mode determination circuit 12 and a second detection mode determination circuit 13 described later. Control is performed so as to generate one normal drive pulse from the pulse generation circuit 3. If it is determined that the rotation detection signal of the rotor 10 is not generated and the rotation is failed, the normal drive pulse selection circuit 14 generates a normal drive pulse SP2 having a driving force one rank higher than the previous time as shown in FIG. Switch to output. Reference numeral 4 denotes a correction driving pulse generation circuit, which is based on the signal from the frequency dividing circuit 2 as shown in FIG.
The ms correction drive pulse FP is output. The correction drive pulse FP is output after 32 ms has elapsed from the second when it is determined that the rotation detection signal of the rotor 10 is not generated and rotation has failed.

  Reference numeral 5 denotes a first detection pulse generation circuit, which outputs detection pulses B6 to B12 used in the first detection mode based on the signal from the frequency dividing circuit 2. The detection pulses B6 to B12 are pulses having a width of 0.125 ms as shown in FIG. 18B, and are output every 1 ms from 6 ms to 12 ms after the second. Reference numeral 6 denotes a second detection pulse generating circuit, which outputs detection pulses F8 to F18 used in the second detection mode based on the signal from the frequency dividing circuit 2. The detection pulses F8 to F18 are pulses having a width of 0.125 ms as shown in FIG. 18C, and are output every 1 ms from 8 ms to 18 ms after the second.

  Reference numeral 7 denotes a pulse group selection circuit. A signal output from the correction drive pulse generation circuit 4, the first detection pulse generation circuit 5, the second detection pulse generation circuit 6, and the normal drive pulse selection circuit 14 is a first detection mode to be described later. Based on the determination results of the determination circuit 12 and the second detection mode determination circuit 13, selection output is performed. Reference numeral 8 denotes a driver circuit which outputs a signal from the pulse selection circuit 7 to the coil 9 to rotate the rotor 10 and control rotation detection. The driver circuit 8 outputs the respective pulses alternately from the terminals O1 and O2 every second. A detection circuit 11 detects an induced voltage generated in the coil 9. Reference numeral 12 denotes a first detection mode determination circuit for determining the first detection mode based on the detection signal of the detection circuit 11, and reference numeral 13 denotes a second detection for determining the second detection mode based on the detection signal of the detection circuit 11. It is a mode determination circuit.

  The detection pulses B6 to B12 are output to a terminal on the opposite side from which the normal drive pulse SP is output, and the impedance of the closed loop including the coil 9 is rapidly changed, so that the rotor 10 after the normal drive pulse SP is applied is free. The counter electromotive voltage generated by the vibration is amplified and detected by the detection circuit 11. The detection pulses F8 to F18 are output to the same terminal from which the normal drive pulse SP is output, and the impedance of the closed loop including the coil 9 is abruptly changed to freely change the rotor 10 after the normal drive pulse SP is applied. The counter electromotive voltage generated by the vibration is amplified and detected by the detection circuit 11.

  Next, the operation of the above configuration will be described. The pulse group selection circuit 7 selects the normal drive pulse SP output from the normal drive pulse selection circuit 14 at the time of the second and drives the step motor 20. The first detection mode is started 6 ms after the second. In the first detection mode, the pulse selection circuit 7 selects and outputs the detection pulses B6 to B12 output from the first detection pulse generation circuit 5, and controls the step motor 20 to change the impedance of the coil 9. The detection circuit 11 detects the induced voltage generated in the coil 9 by the detection pulses B6 to B12. On the other hand, the pulse group selection circuit 7 instructs the first detection mode determination circuit 12 to start the determination operation. The first detection mode determination circuit 12 determines whether or not there is a detection signal in the first detection mode based on the number of detection signal inputs from the detection circuit 11, and the detection signal of the detection circuit 11 is generated twice. In this case, the pulse selection circuit 7 is notified so that the detection pulse output from the first detection pulse generation circuit 5 is immediately stopped and the operation of the first detection mode is terminated, and the correction drive pulse FP is not generated. The second detection mode is shifted to the second detection mode by instructing the start of the operation of the second detection mode determination circuit 13. However, if no detection signal is generated by the detection pulses B6 to B12 or only one detection signal is generated, it is determined that the rotation has failed, and the operation of the first detection mode is terminated and the operation is not shifted to the second detection mode, and correction driving is performed. The pulse FP is output, and when the next normal driving pulse is output, the normal driving pulse selection circuit 14 outputs the normal driving pulse SP2 having a driving force one rank higher than the previous time.

In the second detection mode, the pulse group selection circuit 7 selects and outputs the detection pulses F8 to F18 generated by the second detection pulse generation circuit 6 to control the step motor 20. The detection circuit 11 detects the induced voltage generated in the coil 9 by the detection pulses F8 to F18. The second detection mode determination circuit 13 receives the detection signal of the detection circuit 11, and when the detection signal is generated twice, determines that the rotation is successful and immediately stops the detection pulse output from the second detection pulse generation circuit 6. The operation of the second detection mode is ended, and the pulse group selection circuit 7 is controlled so as not to output the correction drive pulse FP. However, the detection signal generated by the detection pulses F8 to F18 ends with a maximum of seven detections, and if no detection signal is generated or only one detection signal is generated during that time, it is determined that the rotation has failed and the correction drive pulse is detected. FP is output, and at the time of the next normal drive pulse output, the normal drive pulse selection circuit 14 outputs the normal drive pulse SP2 having a driving force one rank higher than the previous time.

  An actual rotation detection method in the above operation will be described with reference to the waveform diagrams of FIGS. First, the case where the rotor 10 rotates normally will be described. FIG. 19A shows a current waveform induced in the coil 9 when the rotor 10 rotates, and FIG. 19B shows a voltage waveform generated at one terminal O1 of the coil 9 in the second detection mode. (C) is a voltage waveform generated at the other terminal O2 of the coil 9 in the first detection mode. The generated waveforms at the terminals O1 and O2 are alternating pulses whose phases are reversed every second.

  First, the normal drive pulse SP shown in FIG. 18A is applied to one end O1 of the coil 9, and the rotor 10 rotates. The current waveform at this time is the waveform c1 in FIG. When the normal drive pulse SP is completed, the rotor 10 is in a free vibration state, and the current waveforms are induced current waveforms indicated by c2, c3, and c4. At the time of 6 ms, the first detection mode is started, and the detection pulse B6 shown in FIG. As shown in FIG. 19A, at 6 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 19C, the induced voltage V6 generated by the detection pulse B6 does not exceed the threshold value Vth of the detection circuit (hereinafter simply referred to as threshold value Vth). However, at 7 ms, the current waveform becomes the region of the current waveform c3, and the current value changes in the positive direction. Therefore, as shown in FIG. 19C, the induced voltage V7 generated by the detection pulse B7 is a detection signal exceeding the threshold value Vth. Similarly, even at 8 ms, the current waveform is in the region of the current waveform c3, and the induced voltage V8 generated by the detection pulse B8 becomes a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V7 and V8 exceed the threshold value Vth, the mode is switched to the second detection mode.

  Since the second detection mode is set by the induced voltage V8, the detection pulse F9 at the next timing, that is, the detection pulse F9 at 9 ms shown in FIG. As shown in FIG. 19A, at 9 ms, the current waveform is in the region of the current waveform c3, and the current value is in the positive direction. Therefore, the induced voltage V9 generated by the detection pulse F9 is the threshold value as shown in FIG. It does not exceed Vth. Further, the induced voltages V10, V11, and V12 generated by the detection pulses F10, F11, and F12 are also in the region of the current waveform c3, and thus do not exceed the threshold value Vth. However, at 13 ms, the current waveform becomes the region of the current waveform c4 as shown in FIG. 19A, the current value changes in the negative direction, and the induced voltage V13 generated by the detection pulses F13 and F14 as shown in FIG. 19B. , V14 is a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V13 and V14 exceed the threshold value Vth, the second detection mode determination circuit 13 determines that the rotation is successful, the correction drive pulse FP is not output, and the next normal drive pulse output Sometimes, the normal drive pulse SP having the same driving force as the previous time is output.

  Next, the case where the rotor 10 cannot be rotated will be described with reference to the waveform diagrams of FIGS. FIG. 20A shows a current waveform induced in the coil 9 when the driving force of the step motor 20 is lowered due to a decrease in the operating voltage of the driver circuit 8 and the rotor 10 cannot be rotated. FIG. 20B shows a voltage waveform generated at one terminal O1 of the coil 9 and FIG. 20C shows a voltage waveform generated at the other terminal O2 of the coil 9.

  The current waveform generated in the coil when it cannot be rotated is a current waveform as shown in FIG. That is, up to the current waveform c1, the current waveform is almost the same as that in the case where the rotation can be performed, but the subsequent current waveforms are as shown by the current waveforms c2, c5, and c6. The current waveform generated in the coil 9 when it cannot be rotated becomes a long and gentle waveform as shown by the current waveform c5 as compared with the case where it can be rotated. The rotation detection method is the same even when the rotation cannot be performed. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 20A, at 6 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 20C, the induced voltage V6 does not exceed the threshold value Vth. However, at 7 ms, the current waveform becomes the region of the current waveform c5, and the current value changes in the positive direction. Therefore, as shown in FIG. 20C, the induced voltage V7 is a detection signal exceeding the threshold value Vth. Similarly, even at 8 ms, the current waveform is in the region of the current waveform c5, and the induced voltage V8 becomes a detection signal exceeding the threshold value Vth. When the induced voltages V7 and V8 and the two detection signals exceed the threshold value Vth, the mode is switched to the second detection mode.

  The detection pulse F9 at the next timing, that is, the detection pulse F9 at the time of 9 ms shown in FIG. As shown in FIG. 20A, at 9 ms, the current waveform is in the region of the current waveform c5, and the current value is in the positive direction. Therefore, as shown in FIG. 20B, the induced voltage V9 does not exceed the threshold value Vth. The induced voltages V10 to V14 generated by the detection pulses F10 to F14 are also in the region of the current waveform c5 and do not exceed the threshold value Vth. Furthermore, the induced voltage V15 generated by the detection pulse F15 which is the seventh detection in the second detection mode is also in the region of the current waveform c5 and does not exceed the threshold value Vth. Therefore, the detection signal exceeding the threshold is not detected within the seven detection periods from the induced voltages V9 to V15. Therefore, the second detection mode determination circuit 13 determines that the rotation has failed and aborts the determination. As a result, the pulse selection circuit 7 selects the correction drive pulse FP and drives the step motor 20 to reliably rotate the rotor 10. As described above, rotation and non-rotation are detected, and when the rotation cannot be performed, the correction drive pulse FP can be appropriately output. When the next normal drive pulse is output, the driving force is higher by one rank than the previous time. The normal drive pulse SP2 can be output.

  In addition, when driven relatively weakly, the rotor rarely stops at the top of the magnetic potential peak. That is, since it cannot rotate and does not return to the stationary position before the rotation, free vibration due to rotation does not occur, and waveforms of c3 and c4 as shown in FIG. 19 or waveforms of c5 and c6 as shown in FIG. Never appears. Therefore, since the induced voltages V6 to V12 generated by the detection pulses B6 to B12 in the first detection mode do not exceed the threshold value Vth, the detection signal exceeding the threshold value is not detected within the detection period, and the second There is no switch to detection mode. Therefore, the first detection mode determination circuit 12 determines that the rotation has failed and aborts the determination. As a result, the pulse selection circuit 7 selects the correction drive pulse FP and drives the step motor 20 to rotate the rotor 10 reliably. When the normal drive pulse is output, the normal drive pulse SP2 having a driving force one rank higher than the previous time is output.

When the step motor 20 does not rotate normally as described above, the step motor 20 is reliably rotated by outputting a correction drive pulse having a sufficiently large effective power, and the effective power of the normal drive pulse is increased. Can be driven with as low power as possible.
JP-A-7-120567 (paragraphs 0028-0033, FIG. 7) JP-B-8-33457 (page 4, column 7, line 40 to page 5, column 10, line 5, FIGS. 7 to 13)

  However, when a pointer with a large moment of inertia is used for the second hand or the like, the current waveform is disturbed, and although it is able to rotate, it is erroneously determined that the rotation has failed, and the correction drive pulse FP is output and at the same time the normal drive pulse is effective. There is a problem that the battery life is greatly reduced because the power is increased by the rank increase and the normal drive pulse is output for a certain period while the rank of the driving force is high. In addition, when a calendar or the like is used, the normal drive pulse cannot be rotated by a normal drive pulse SP due to a sudden load, and the normal drive pulse repeatedly ranks up and can be reliably rotated until it can be stably driven by a normal drive pulse having a high driving force. As described above, since the correction driving pulse FP having a high current consumption is continuously output, the battery life is significantly reduced as described above. Further, even when a magnetic field is applied from the outside, a large deviation is generally generated in the static stable position of the rotor. Therefore, in a two-pole step motor, the normal drive pulse SP is output to the terminal O1 side and the normal to the terminal O2 side. In many cases, the determination of rotation detection differs greatly when the drive pulse SP is output. That is, one is likely to cross the peak of the magnetic potential and has a high driving force and can be sufficiently rotated by the normal driving pulse SP, but the other is difficult to cross the peak of the magnetic potential and the driving force is low, so the rotation is performed by the normal driving pulse SP. Can not do it. Therefore, one is determined to be successful in rotation, the correction drive pulse FP is not output, and the normal drive pulse SP is not ranked up, but the other is determined as rotation failure, and the correction drive pulse is used so that rotation can be performed reliably. Is output at the same time as the normal drive pulse. Even if the driving force of the normal driving pulse changes, such as when a magnetic field is applied from the outside, if the rotation success and rotation failure determinations are repeated alternately, the normal driving pulse rank-up that occurs when the rotation failure is determined An increase in power consumption is inevitable.

  An object of the present invention is to provide an electronic timepiece that eliminates the above-mentioned drawbacks and consumes less current than in the past when a second hand with a large moment of inertia is used, or when disturbances such as motor load fluctuations and external magnetic fields act. That is.

  In order to achieve the above object, the present invention has the following configuration. That is, in the configuration of claim 1, a step motor having a coil and a rotor, drive pulse generating means for generating a drive pulse for driving the step motor, and a step of driving the step motor based on the drive pulse Motor drive means; detection means for detecting rotation and non-rotation of the rotor after the drive pulse is output from the drive pulse generation means; and the drive pulse generation so as to change the effective power of the drive pulse. Driving pulse control means for controlling the means, wherein the drive pulse control means determines the effective power of the drive pulse based on the detection means detecting non-rotation of the rotor a plurality of times. It is characterized by performing control to change.

  Further, the detection means includes a first detection means for detecting rotation and non-rotation of the rotor in a first period after the drive pulse generation means outputs the drive pulse, and the first period. And a second detection means for detecting the rotation and non-rotation of the rotor in a second period after.

  The drive pulse control means performs control to increase the effective power of the drive pulse based on the detection means detecting the non-rotation of the rotor a predetermined number of times or more in a predetermined detection period. And

  Further, the drive pulse control means performs control to adjust the amount by which the effective power of the drive pulse is increased in accordance with the number of times the detection means detects non-rotation of the rotor in the predetermined period. Features.

  The drive pulse control means adjusts the amount by which the effective power of the drive pulse is increased according to the number of consecutive non-rotations when the detection means continuously detects non-rotation of the rotor. Control is performed.

  In addition, the drive pulse control means detects the non-rotation of the rotor in a predetermined cycle even if the detection means detects the non-rotation of the rotor a plurality of times. The generation means is not controlled.

  Further, the drive pulse control means performs control to reduce the effective power of the drive pulse when the detection means detects that the non-rotation of the rotor is generated at a predetermined cycle. And

  Further, the detection means includes correction drive pulse generation means for outputting a correction drive pulse for correcting and driving the step motor when the non-rotation of the rotor is detected.

  As described above, according to the present invention, after detecting the rotation failure of the rotor a plurality of times, the effective power of the normal drive pulse is changed according to the detected contents, so that the second hand with a large moment of inertia is used or the motor Even if a disturbance such as a load fluctuation or an external magnetic field acts, there is an effect that it is possible to provide an electronic timepiece that consumes less current than before.

  Furthermore, the ability to use a second hand with a large moment of inertia for a long time is effective even in a finished watch, but it also increases the degree of freedom of the second hand that can be used by customers in selling watch movements, which is very advantageous in terms of design. Technology.

  First, an outline of the present invention will be described with reference to a flowchart. FIG. 1 is a flowchart showing the concept of a rotor rotation detection method in an electronic timepiece according to the present invention. The operations from generation of a normal drive pulse to determination of rotation detection of a rotor and correction drive pulse generation control performed every second are performed. It is a representation. The normal drive pulse SP is output at the timing of the positive second (step ST1), and the first detection mode is started after a certain period after the normal drive pulse SP ends, that is, 6 ms after the positive second (step ST2). In the first detection mode, it is determined whether or not a detection signal is detected (step ST3). If the detection signal is generated, the second detection mode is immediately started (step ST4). If no detection signal is detected as shown in the conventional example, it is determined that rotation has failed (step ST5), and a normal drive pulse having a driving force that is one rank larger is output (step ST6). When shifting to the second detection mode, it is determined whether or not a detection signal is detected within a predetermined period (step ST7). If the detection signal is detected within a predetermined period, it is determined that the rotation is successful (step ST8), and if the detection signal is not detected within the predetermined period, it is determined that the rotation has failed (step ST9). If it is determined that the rotation has failed, the number of times that the rotation has been determined to be unsuccessful is counted (step ST10). If the number of rotations coincides with the predetermined number of times, the rank of the normal drive pulse is changed (step ST11). In this case, the rank is not changed, and the next hand movement also outputs a normal driving pulse having the same driving force as the previous time (step ST12). As a result, the operation for the second is completed, and the next positive second is waited to start again from the beginning.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. In the first embodiment, when a detection signal is not detected within a predetermined period in the second detection mode, it is determined that the rotation has failed, the number of detections determined as the rotation failure is counted, and the non-rotation of the rotor 10 is predetermined. This is an example of increasing the rank of the effective power of the normal drive pulse based on the detection of the number of times or more. FIG. 2 is a block diagram showing the circuit configuration of the electronic timepiece according to the first embodiment of the present invention, and FIG. 18 is a pulse waveform diagram generated by the circuit of the electronic timepiece according to the first embodiment of the present invention (conventional example). 6 is a time chart of the electronic timepiece according to the first embodiment of the present invention, and FIGS. 3 and 4 are large moments of inertia in the electronic timepiece according to the first embodiment of the present invention. FIG. 5 is a diagram showing current waveforms and voltage waveforms generated in a coil when a hand is attached. FIG. 5 shows the operation of a stepping motor when the rotor of the electronic timepiece according to the first embodiment of the present invention lowers the operating voltage of the driver circuit 8. It is an example of a current waveform and a voltage waveform diagram when the force is lowered and cannot be rotated. In addition, the same number is attached | subjected to the same component as what was demonstrated in the prior art example, and description is abbreviate | omitted.

  In FIG. 2, 20 is a step motor composed of a coil 9 and a rotor 10, 1 is an oscillation circuit, 2 is a frequency dividing circuit, 3 is a normal drive pulse generation circuit, 4 is a correction drive pulse generation circuit, and 5 is a first detection. The pulse generation circuit outputs detection pulses B6 to B12 used in the first detection mode based on the signal from the frequency divider circuit 2. The detection pulses B6 to B12 are pulses having a width of 0.125 ms as shown in FIG. 18B, and are output every 1 ms from 6 ms to 12 ms after the second. Reference numeral 6 denotes a second detection pulse generation circuit that outputs detection pulses F8 to F19 used in the second detection mode based on the signal from the frequency dividing circuit 2. The detection pulses F8 to F19 are pulses having a width of 0.125 ms as shown in FIG. 18C, and are output every 1 ms from 8 ms to 19 ms after the second.

  7 is a pulse group selection circuit, 8 is a driver circuit, 9 is a coil, 10 is a rotor, 11 is a detection circuit, and 12 is a first detection mode determination circuit that determines the first detection mode based on the detection signal of the detection circuit 11. , 13 is a second detection mode determination circuit for determining the second detection mode based on the detection signal of the detection circuit 11, 14 is a normal drive pulse selection circuit, and the effective power generated by the normal drive pulse generation circuit 3 is different. One normal drive pulse is selected from a plurality of normal drive pulses based on a detection signal of a non-rotation counter circuit 15 described later and output. Control is performed so as to generate one normal drive pulse from the normal drive pulse generation circuit 3 that can generate a plurality of normal drive pulses having different effective powers based on a detection signal of a non-rotation counter circuit 15 described later. That is, the normal drive pulse selection circuit 14 is drive pulse control means for controlling the normal drive pulse generation circuit 3 so as to change the effective power of the drive pulse. Reference numeral 15 denotes a non-rotation counter circuit, which counts the number of times the rotor 10 is determined to be non-rotation by the second detection mode determination circuit.

Next, the operation of the above configuration will be described. The normal drive pulse selection circuit 14 selects the normal drive pulse SP output from the normal drive pulse generation circuit 3 at the time of the second and outputs it to the driver circuit 8 via the pulse group selection circuit 7 to drive the step motor 20. To do. The first detection mode is started 6 ms after the second. In the first detection mode, the pulse group selection circuit 7 outputs the detection pulses B6 to B12 output from the first detection pulse generation circuit 5, and controls the step motor 20 to change the impedance of the coil 9. The detection circuit 11 detects the induced voltage generated in the coil 9 by the detection pulses B6 to B12, and outputs a detection signal when detecting the induced voltage exceeding the threshold value Vth. On the other hand, the pulse group selection circuit 7 instructs the first detection mode determination circuit 12 to start the determination operation. The first detection mode determination circuit 12 determines whether or not there is a detection signal in the first detection mode based on the input of the detection signal from the detection circuit 11, and when the detection signal is generated from the detection circuit 11 twice. The pulse selection circuit 7 is notified so that the detection pulse output from the first detection pulse generation circuit 5 is immediately stopped, the operation of the first detection mode is terminated, and the correction drive pulse FP is not generated. The second detection mode is shifted to the second detection mode by instructing the start of the operation of the second detection mode determination circuit 13. However, if no detection signal is generated by the detection pulses B6 to B12 or only one detection signal is generated, it is determined that the rotation has failed, and the operation of the first detection mode is terminated and the operation is not shifted to the second detection mode, and correction driving is performed. The pulse FP is output, and when the next normal driving pulse is output, the normal driving pulse selection circuit 14 outputs the normal driving pulse SP2 having a driving force one rank higher than the previous time.

  When shifting to the second detection mode, the pulse group selection circuit 7 selects and outputs the detection pulses F8 to F18 output from the second detection pulse generation circuit 6 to control the step motor 20. The detection circuit 11 detects the induced voltage generated in the coil 9 by the detection pulse, and outputs a detection signal when detecting the induced voltage exceeding the threshold value Vth. The second detection mode determination circuit 13 receives the detection signal of the detection circuit 11, and when the detection signal is generated twice, determines that the rotation is successful and immediately stops the detection pulse output from the second detection pulse generation circuit 6. While stopping the operation in the second detection mode, the pulse group selection circuit 7 is controlled so as not to output the correction drive pulse FP. However, the detection signal generated by the detection pulses F8 to F18 ends with a maximum of seven detections, and if no detection signal is generated during that time, it is determined that rotation has failed and the correction drive pulse FP is output. If the number of times that the non-rotation counter circuit 15 determines that the rotation has failed is 2 times in 2 seconds with 2 seconds as one cycle, the normal drive pulse selection circuit 14 is normally driven when the normal drive pulse is output after 2 seconds. The pulse generation circuit 3 is controlled to output a normal drive pulse SP2 having a driving force that is one rank higher than 2 seconds before to increase the effective power of the normal drive pulse, and the number of times determined to be a rotation failure is 1 every 2 seconds. When the normal driving pulse is output after 2 seconds, the normal driving pulse SP having the same driving force as that before 2 seconds is output from the normal driving pulse selection circuit 14.

  In other words, the period from when 6 seconds have passed since the second to the time when the first detection mode determination circuit 12 outputs the detection signal twice and ends the operation of the first detection mode is defined as the first period. During the first period, rotation and non-rotation of the rotor 10 are detected by the first detection means constituted by the first detection pulse generation circuit 5, the pulse group selection circuit 7, the detection circuit 11, and the first detection mode determination circuit 12. ing. The period from the start of the second detection mode until the second detection mode determination circuit 13 receives the detection signal of the detection circuit 11 twice or the seven detection pulses are output is defined as a second period. Rotation and non-rotation of the rotor 10 is detected by the first detection means constituted by the second detection pulse generation circuit 6, the pulse group selection circuit 7, the detection circuit 11, and the second detection mode determination circuit 13 during the period 2 Yes. As described above, the first detection means and the second detection means detect the rotation and non-rotation of the rotor 10 after the normal drive pulse is output from the normal drive pulse generation circuit 3. Then, assuming that the predetermined detection period is 2 seconds, the effective power of the normal drive pulse is increased when the number of non-rotations of the rotor 10 detected by the second detection means reaches the predetermined number of times in the predetermined detection period. .

  The above control operation will be described in detail from the actual rotation detection. FIG. 3 is a current waveform and voltage waveform diagram when the rotor 10 is able to normally rotate with the normal drive pulse SP when a hand having a large moment of inertia is attached to the electronic timepiece of the first embodiment. FIG. 4 shows that the rotation of the rotor 10 when the hands of large moment of inertia are attached to the electronic timepiece of the first embodiment has a driving force capable of rotating with the normal driving pulse SP, but it is determined that the rotation has failed due to an erroneous determination. It is a current waveform and a voltage waveform diagram at the time. FIGS. 3A and 4A show current waveforms induced in the coil 9 when a needle having a large moment of inertia is attached. FIGS. 3B and 4B show the coil 9 at this time. FIG. 3C and FIG. 4C are voltage waveforms generated at the other terminal O 2 of the coil 9.

Usually, when a needle having a large moment of inertia is attached, a current waveform as shown in FIG. That is, the waveform shape shown in the induced current waveforms c2, c3, cx, cy, c4 follows the current waveform c1. Compared to the current waveform shown in FIG. 19A, the current waveforms c3 and c4 are collapsed, and stepped current waveforms cx and cy are newly generated. The current waveforms cx and cy are generated because the free vibration of the rotor 10 is restricted by the moment of inertia of the second hand. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. 6ms, 7ms as shown in Fig. 3 (a)
Then, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 3C, the induced voltages V6 and V7 do not exceed the threshold value Vth. However, at 8 ms, the current waveform becomes the region of the current waveform c3, and the current value changes in the positive direction. Therefore, as shown in FIG. 3C, the induced voltage V8 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 9 ms, the current waveform is in the region of the current waveform c3, and the induced voltage V9 becomes a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V8 and V9 exceed the threshold value Vth, the mode is switched to the second detection mode.

  Since the second detection mode is set by the induced voltage V9, the detection pulse F10 at the next timing, that is, the detection pulse F10 at the time of 10 ms is applied to the coil 9. As shown in FIG. 3A, at 10 ms, the current waveform is in the region of the current waveform c3, and the current value is in the positive direction. Therefore, as shown in FIG. 3B, the induced voltage V10 does not exceed the threshold value Vth. Similarly, the induced voltage V11 is in the region of the current waveform c3 and does not exceed the threshold value Vth. However, at 12 ms, the current waveform becomes the region of the current waveform cx, and the current value changes in the negative direction. Therefore, as shown in FIG. 3B, the induced voltage V12 becomes a detection signal exceeding the threshold value Vth. Although it becomes the region of the current waveform cy at 13 ms, the current value changes in the positive direction, and the induced voltage V13 generated by the detection pulse F13 does not exceed the threshold value Vth. However, at 14 ms, the current waveform becomes the region of the current waveform c4, and the current value changes in the negative direction. Therefore, as shown in FIG. 3B, the induced voltage V14 becomes a detection signal exceeding the threshold value Vth. The induced voltages V12 and V14 generated by the detection pulses F12 and F14 are detection signals that exceed the threshold value Vth. When the two detection signals of the induced voltages V12 and V14 exceed the threshold value Vth, the second detection mode determination circuit 13 determines that the rotation is successful, and the correction drive pulse FP is not output.

  However, when a needle having a large moment of inertia is attached, the rotation of the rotor 10 is disturbed by the large inertia of the second hand, and a current waveform as shown in FIG. 4 may be generated about once every 6 seconds. That is, the waveform shapes shown in the induced current waveforms c2, c3, cy, and c4 are generated following the current waveform c1. Compared with the current waveform shown in FIG. 3A, the current waveform cx disappears, and only a stepped current waveform cy is generated. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 4A, at 6 ms and 7 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 4C, the induced voltages V6 and V7 do not exceed the threshold value Vth. However, at 8 ms, the current waveform becomes the region of the current waveform c3, and the current value changes in the positive direction. Therefore, as shown in FIG. 4C, the induced voltage V8 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 9 ms, the current waveform is in the region of the current waveform c3, and the induced voltage V9 becomes a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V8 and V9 exceed the threshold value Vth, the mode is switched to the second detection mode.

Since the second detection mode is set by the induced voltage V9, the detection pulse F10 at the next timing, that is, the detection pulse F10 at the time of 10 ms is applied to the coil 9. As shown in FIG. 4A, at 10 ms, the current waveform is in the region of the current waveform c3, and the current value is in the positive direction. Therefore, as shown in FIG. 4B, the induced voltage V10 does not exceed the threshold value Vth. Similarly, the induced voltage V11 is in the region of the current waveform c3 and does not exceed the threshold value Vth. At 12 ms, the current waveform becomes the region of the current waveform cy, but the current value remains in the positive direction, and the induced voltage V12 does not exceed the threshold value Vth. Similarly, the induced voltage V13 is in the region of the current waveform cy and does not exceed the threshold value Vth. At 14 ms, the current waveform becomes the region of the current waveform c4, and the current value changes in the negative direction. Therefore, as shown in FIG. 4B, the induced voltage V14 becomes a detection signal exceeding the threshold value Vth. However, the detection signal exceeding the threshold value is not detected twice within the seven detection periods from the induced voltage V10 to the induced voltage V16, and the second detection mode determination circuit 13 determines that the rotation has failed, The pulse selection circuit 7 selects and outputs the correction drive pulse FP. In other words, the correction drive pulse FP is output due to erroneous determination even though the rotation is possible, and at the same time when the normal drive pulse is output after the non-rotation detection, the normal drive pulse selection circuit 14 drives one rank higher than before the non-rotation detection. A normal drive pulse having a force is output.

  In order to solve the above problem, a countermeasure may be considered in which the number of rotation detection determinations in the second detection mode is changed from two to one. However, this measure cannot be adopted because of the following problems. This problem will be described with reference to FIG. FIG. 5 is a waveform diagram when the driving force of the step motor 20 is further weaker than that of FIG. 20 and the rotor 10 cannot be rotated. FIG. 5A shows a current waveform induced in the coil 9 when the rotor 10 cannot rotate, and FIG. 5B shows a voltage waveform generated at one terminal O1 of the coil 9 at this time. (C) is a voltage waveform generated at the other terminal O2 of the coil 9.

  The current waveform generated in the coil when the driving force is further weakened and cannot be rotated is as shown in FIG. That is, the current waveform shown in current waveforms c5 and c6 follows the current waveform c1. Compared with the current waveform of FIG. 20A, the current waveform c2 does not appear, the current waveform c5 appears following the current waveform c1, and the current waveform c5 ends at an early point and becomes a current waveform where the current waveform c6 appears. . In the case of such a current waveform, if the number of times of determination of rotation detection in the second detection mode is simply changed from two times to one time, it is as follows. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 5A, at 6 ms, the current waveform is in the region of the current waveform c5, the current value is in the positive direction, and the induced voltage V6 exceeds the threshold value Vth as shown in FIG. 5C. It becomes a detection signal. Further, even at 7 ms, the current waveform is in the region of the current waveform c5, and the induced voltage V7 becomes a detection signal exceeding the threshold value Vth. When the induced voltages V6 and V7 and the two detection signals exceed the threshold value Vth, the mode shifts to the second detection mode.

  Since the second detection mode is set by the induced voltage V7, the detection pulse F8 at the next timing, that is, the detection pulse F8 at 8 ms is applied to the coil 9. As shown in FIG. 5A, at 8 ms, the current waveform is in the region of the current waveform c5 and the current value is in the positive direction, so that the induced voltage V8 exceeds the threshold value Vth as shown in FIG. 5B. There is no. Furthermore, the induced voltages V9 to V13 are also in the region of the current waveform c5 and do not exceed the threshold value Vth. However, at 14 ms, which is the seventh detection in the second detection mode, the current waveform becomes the region of the current waveform c6 as shown in FIG. 5A, and the current value changes in the negative direction. Therefore, as shown in FIG. 5B, the induced voltage V14 becomes a detection signal exceeding the threshold value Vth. At this time, the second detection mode determination circuit 13 erroneously determines that the rotation has succeeded even though the rotation has not been performed, and the pulse selection circuit 7 does not select and output the correction drive pulse FP, so that the rotor 10 does not rotate. become. As described above, if the number of determinations of the rotation detection in the second detection mode is simply changed from 2 times to 1 time, a fatal problem occurs for the electronic timepiece in which the step motor stops and a time delay occurs.

  Therefore, in the present invention, when the second detection mode determination circuit 13 determines that the rotation has failed in order to drive with the minimum effective power, the pulse selection circuit 7 selects and outputs the correction drive pulse FP in order to reliably rotate. However, when the next normal drive pulse is output, as shown in the timing chart of FIG. 6A, the normal drive pulse with the same drive force as the previous time is output, thereby preventing an increase in power consumption due to an excessive drive force due to rank increase. It was.

However, as shown in the current waveform of FIG. 20, when the driving voltage of the step motor 20 decreases due to, for example, the operating voltage of the driver circuit 8 decreasing, the second detection mode determination is performed as shown in the timing chart of FIG. The number of times that the circuit 13 determines that the rotation has failed increases, and the correction drive pulse FP is frequently output. The correction driving pulse FP is a pulse with a large current consumption in order to drive the step motor 20 reliably. Therefore, it is necessary to increase the rank of the normal drive pulse so as not to output the correction drive pulse frequently and to output the rank of the minimum drive force. Therefore, as shown in FIG. 6B, the number of times the second detection mode determination circuit 13 determines that the rotation has failed in both the period t1-t2 and the period t2-t3, and the non-rotation counter circuit 15 determines that the rotation has failed. In the case of 2 times in 2 seconds, when a normal drive pulse is output after 2 seconds, a normal drive pulse SP2 having a driving force that is one rank higher than that of 2 seconds before is output from the normal drive pulse selection circuit 14 and a second detection mode determination circuit As shown in FIG. 6A, the number of times determined as rotation failure by 13 is determined as successful rotation during the period t 1 -t 2, the rotation failure is determined during the period t 2 -t 3, and the non-rotation counter circuit 15 performs rotation. When the number of times of failure is determined to be once every 2 seconds, the normal drive pulse having the same driving force as that of 2 seconds before is output from the normal drive pulse selection circuit 14 when the normal drive pulse is output after 2 seconds. It was decided to output the SP. As a result, it is possible to cope with a decrease in the driving force of the step motor 20 due to an erroneous determination when a pointer having a large moment of inertia is used for the second hand or the like, or when the operating voltage of the driver circuit 8 decreases, and the correction driving pulse FP is output wastefully. As a result, the current consumption does not increase.

  The above operation will be described with reference to a flowchart. FIG. 7 is a flowchart showing the rotor rotation detection method in the electronic timepiece of the first embodiment, and shows the operation every second. Note that step numbers (ST *) in the flowchart are the same as those in FIG. The normal drive pulse SP is output at the timing of the second (step ST1), and the first detection mode is started 6 ms after the second (step ST2). In the first detection mode, it is determined whether or not a detection signal is detected, and after completion (step ST3), if the detection signal is generated twice, the second detection mode is immediately started (step ST4). As shown in the conventional example, if the detection signal does not occur once or does not occur, it is determined that the rotation has failed (step ST5), and a normal driving pulse having a driving force larger by one rank is output (step ST6). When shifting to the second detection mode, it is determined whether or not the detection signal is detected twice within the maximum number of detection times of 7 (step ST7), and the detection signal is detected twice within the maximum number of detection times of 7 In this case, it is determined that the rotation is successful (step ST8), and when the detection signal is not detected twice within the maximum number of detection times of 7, the rotation is determined to be failed (step ST9). If it is determined that the rotation has failed, the number of times that the rotation has been determined to be failed is counted (step ST10). If it is determined that the rotation has failed twice in 2 seconds, the normal drive pulse is increased by one rank (step S11). ). If it is determined that rotation has failed once every two seconds, the rank is not changed, and the next hand movement also outputs a normal drive pulse having the same driving force as the previous time (step ST12).

  If non-rotation is detected twice with 2 seconds as one cycle this time, a normal drive pulse having a driving force that is one rank larger is output. However, depending on the load status of the rotor 10, for example, 4 seconds is set as one cycle. Non-rotation of the rotor is detected during a predetermined detection period for detecting the number of non-rotations of the rotor, such as 2 ranks when rotation is detected 3 times and 3 ranks when non-rotation is detected 4 times. The rank may be changed to a normal drive pulse having a large driving force at a time by increasing the power of the normal driving pulse in accordance with the number of times of the normal driving pulse. Further, when the non-rotation of the rotor 10 is detected, a predetermined period for detecting the number of non-rotations of the rotor is detected for a predetermined period, for example, 4 seconds, starting from the exact second timing at which the non-rotated normal drive pulse is output. It is good also as a detection period.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings. In the second embodiment, when the detection signal is not detected within the predetermined period in the second detection mode, it is determined that the rotation has failed, and based on the fact that the non-rotation of the rotor 10 is continuously detected, This is an example of increasing the rank of effective power. FIG. 2 is a block diagram showing the circuit configuration of the electronic timepiece of the second embodiment (the same drawing as that of the first embodiment), and FIG. 18 shows the circuit of the electronic timepiece of the second embodiment. FIG. 9 is a time chart of an electronic timepiece according to the second embodiment, and FIG. 20 is a calendar load applied to the electronic timepiece according to the second embodiment. Current waveform and voltage waveform diagram generated in the coil in the case (the same drawing as the conventional example), FIG. 8 is compared with FIG. 20 when the calendar load is acting on the electronic timepiece of the second embodiment. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil at the time of increasing the effective electric power of a normal drive pulse. In addition, the same number is attached | subjected to the same component as what was demonstrated in the prior art example, and description is abbreviate | omitted.

  The block diagram of the second embodiment is the same as the block diagram of the first embodiment shown in FIG. 2, and only the operation of the normal drive pulse selection circuit 14 is different. In the second embodiment, when the rotation failure is counted twice in the non-rotation counter circuit 15, the normal drive pulse is output one rank higher than the normal drive pulse selection circuit 14 when the normal drive pulse is output immediately after the count. A drive pulse is output. Next, when the rotation failure is continuously counted as 3 or more times, the normal drive pulse having the maximum driving force is output from the normal drive pulse selection circuit 14 when the normal drive pulse is output immediately after the count. In this way, when the non-rotation of the rotor is detected continuously, the amount by which the effective power of the normal drive pulse is increased is adjusted according to the number of consecutive non-rotations. When the number of times counted as rotation failure is 1, the normal drive pulse selection circuit 14 outputs the normal drive pulse SP having the same driving force as before non-rotation detection.

  The above control operation will be described in detail from the actual rotation detection. FIG. 20 is a current waveform and voltage waveform diagram when the rotor 10 cannot rotate due to insufficient driving force due to the normal driving pulse SP when a calendar load is applied to the electronic timepiece of the second embodiment (conventional example). Is the same drawing). FIG. 8 is a current waveform and voltage waveform diagram when the rotor 10 when the calendar load is applied to the electronic timepiece according to the second embodiment can be normally rotated by the normal driving pulse with the increased driving force. 20 (a) and 8 (a) are current waveforms induced in the coil 9 when a calendar load is applied, and FIGS. 20 (b) and 8 (b) show one of the coils 9 at this time. Voltage waveforms generated at the terminal O1, FIGS. 20C and 8C are voltage waveforms generated at the other terminal O2 of the coil 9. FIG.

  Usually, when a load by a calendar is applied and the rotor cannot be rotated, the current waveform becomes a current waveform as shown in FIG. That is, the current waveform up to the current waveform c1 is almost the same as that in the conventional example shown in FIG. 19A, but the subsequent current waveforms are as shown in the current waveforms c2, c5, and c6. . Compared to the current waveform shown in FIG. 19A of the conventional example, the waveform becomes longer and gentle as shown by the current waveform c5. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 20A, at 6 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 20C, the induced voltage V6 does not exceed the threshold value Vth. However, at 7 ms, the current waveform becomes the region of the current waveform c5, and the current value changes in the positive direction. Therefore, as shown in FIG. 20C, the induced voltage V7 is a detection signal exceeding the threshold value Vth. Similarly, even at 8 ms, the current waveform is in the region of the current waveform c5, and the induced voltage V8 becomes a detection signal exceeding the threshold value Vth. When the induced voltages V7 and V8 and the two detection signals exceed the threshold value Vth, the mode is switched to the second detection mode.

Since the second detection mode is set by the induced voltage V8, the detection pulse F9 at the next timing, that is, the detection pulse F9 at the time of 9 ms shown in FIG. As shown in FIG. 20A, at 9 ms, the current waveform is in the region of the current waveform c5, and the current value is in the positive direction. Therefore, as shown in FIG. 20B, the induced voltage V9 does not exceed the threshold value Vth. The induced voltages V10 to V14 generated by the detection pulses F10 to F14 are also in the region of the current waveform c5 and do not exceed the threshold value Vth. Furthermore, the induced voltage V15 generated by the detection pulse F15 which is the seventh detection in the second detection mode is also in the region of the current waveform c5 and does not exceed the threshold value Vth. Therefore, the detection signal exceeding the threshold is not detected within the seven detection periods from the induced voltages V9 to V15. Therefore, the second detection mode determination circuit 13 determines that the rotation has failed and aborts the determination. As a result, the pulse selection circuit 7 selects the correction drive pulse FP and drives the step motor 20 to reliably rotate the rotor 10.
The correction drive pulse FP is a pulse with a large current consumption in order to drive the step motor 20 reliably. If an abrupt load continues to be applied due to the calendar operation, the rank is repeated many times until the rotor 10 can stably rotate with the normal drive pulse. In other words, while the rank increase is repeated, the pulse selection circuit 7 continues to select and output the correction drive pulse FP, so that the current consumption increases and the battery life is greatly reduced. In the second embodiment, as will be described later, the operation is performed to prevent the continuous generation of the correction drive pulse FP.

  Next, when the calendar load is applied, the normal drive pulse having the maximum driving force is output from the normal drive pulse selection circuit 14 to increase the effective power, and the rotor rotates as shown in FIG. Current waveform. Following the current waveform c1, the waveform shapes shown in the induced current waveforms c2, c3, and c4 are obtained. Compared with the current waveform shown in FIG. 19A, the current waveform c1 has a smooth shape, and the current waveforms c3 and c4 become slightly collapsed waveforms. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 shown in FIG. As shown in FIG. 8A, at 6 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 8C, the induced voltage V6 generated by the detection pulse B6 does not exceed the threshold value Vth of the detection circuit. However, at 7 ms, the current waveform becomes the region of the current waveform c3, and the current value changes in the positive direction. Therefore, as shown in FIG. 8C, the induced voltage V7 generated by the detection pulse B7 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 8 ms, the current waveform is in the region of the current waveform c3, and the induced voltage V8 generated by the detection pulse B8 becomes a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V7 and V8 exceed the threshold value Vth, the mode is switched to the second detection mode.

  Since the second detection mode is set by the induced voltage V8, the detection pulse F9 at the next timing, that is, the detection pulse F9 at 9 ms shown in FIG. As shown in FIG. 8A, at 9 ms, the current waveform is in the region of the current waveform c3, and the current value is in the positive direction. Therefore, the induced voltage V9 generated by the detection pulse F9 is the threshold value as shown in FIG. It does not exceed Vth. Further, the induced voltages V10, V11, and V12 generated by the detection pulses F10, F11, and F12 are also in the region of the current waveform c3, and thus do not exceed the threshold value Vth. However, at 13 ms, the current waveform becomes the region of the current waveform c4 as shown in FIG. 8A, the current value changes in the negative direction, and the induced voltage V13 generated by the detection pulses F13 and F14 as shown in FIG. 8B. , V14 is a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V13 and V14 exceed the threshold value Vth, the second detection mode determination circuit 13 determines that the rotation is successful, and the correction drive pulse FP is not output.

In the second embodiment, at the moment when the calendar load is applied, the normal detection pulse selection is performed when the second detection mode determination circuit 13 determines that the rotation has failed twice consecutively in order to drive with the smallest effective power possible. The circuit 14 outputs a normal drive pulse SP2 having a drive power one rank larger. For example, as shown in FIG. 9B, when it is determined that the rotation has failed continuously by the normal drive pulse SP1 in the period t3-t4 and the period t4-t5, a driving force that is one rank larger in the period t5-t6. The normal drive pulse SP2 is output. If it is determined that the rotation has failed three times in succession during the period t5-t6, it is determined that the load due to the calendar has increased as shown in the timing chart of FIG. 9B. The normal drive pulse selection circuit 14 increases the rank by three so that the normal drive pulse SP3 having the maximum rank of driving force is output at once, thereby preventing the continuous generation of the correction drive pulse FP and suppressing the increase in the power consumption current.
If the number of times that the second detection mode determination circuit 13 has determined that rotation has failed is 1, there is a possibility of erroneous determination as described in the first embodiment. By outputting a normal drive pulse SP having the same driving force as before detection, an increase in power consumption due to an unnecessarily high driving force due to rank increase is prevented.
For example, as shown in FIG. 9A, even if the second detection mode determination circuit 13 determines that the rotation has failed only once in the period t2-t3, in the next period t3-t4, A drive pulse SP having the same driving force is output.

  The above operation will be described with reference to a flowchart. FIG. 10 is a flowchart showing a rotor rotation detection method in the electronic timepiece according to the second embodiment, and shows an operation every second. Note that step numbers (ST *) in the flowchart are the same as those in FIG. The normal drive pulse SP is output at the timing of the second (step ST1), and the first detection mode is started 6 ms after the second (step ST2). In the first detection mode, it is determined whether the detection signal is detected twice (step ST3). If the detection signal is generated twice, the second detection mode is immediately started (step ST4). As shown in the conventional example, if the detection signal does not occur once or does not occur, it is determined that the rotation has failed (step ST5), and a normal driving pulse having a driving force larger by one rank is output (step ST6). When shifting to the second detection mode, it is determined whether or not the detection signal is detected twice within the maximum number of detection times of 7 (step ST7), and the detection signal is detected twice within the maximum number of detection times of 7 (In the case of “Y” in step ST7), it is determined that the rotation is successful (step ST8), and when the detection signal is not detected twice within the maximum number of detection times of 7 (in the case of “N” in step ST7), the rotation is failed. Determination is made (step ST9). If it is determined that the rotation has failed, the number of times that the rotation has been determined to be unsuccessful is counted. If the number of times that the rotation has been determined to be unsuccessful is one (if “N” in step ST10), the rank is not changed. The next hand movement also outputs a normal driving pulse having the same driving force as the previous one. (Step ST11) When it is determined that the rotation has failed twice (“Y” in Step 10 and “N” in Step ST12), it is determined that the operating voltage has decreased and the driving force of the step motor has decreased. Once the normal driving pulse having a driving force that is one rank higher is output (step ST13), it is not possible to rotate even with the driving force increased by one rank, and it is determined that the rotation has failed three times in succession (in step ST12). In the case of “Y”), it is determined that an abrupt load such as a calendar is applied, and the normal drive pulse is shifted to a rank having the maximum driving force at once (step ST14).

  Next, a third embodiment of the present invention will be described in detail with reference to the drawings. In the third embodiment, when the detection signal is not detected within a predetermined period in the second detection mode, it is determined that the rotation has failed, and based on the fact that the non-rotation of the rotor 10 is detected at a predetermined cycle, This is an example in which the rank of the effective power is not controlled. FIG. 2 is a block diagram showing the circuit configuration of the electronic timepiece of the third embodiment (the same drawing as that of the first embodiment), and FIG. 18 shows the circuit of the electronic timepiece of the third embodiment. FIG. 15 is a time chart of an electronic timepiece according to the third embodiment. FIGS. 11 and 13 are external views of the electronic timepiece according to the third embodiment. FIG. 6 is a current waveform and voltage waveform diagram generated in the coil when a magnetic field is applied from the terminal and a normal drive pulse is output to the terminal O1. FIGS. 12 and 14 are current waveform and voltage waveform diagrams generated in the coil when a normal drive pulse is output to the terminal O2 at the moment when a magnetic field is applied to the electronic timepiece of the third embodiment from the outside. In addition, the same number is attached | subjected to the same component as what was demonstrated in the prior art example, and description is abbreviate | omitted.

The block diagram of the third embodiment is the same as the block diagram of the first embodiment shown in FIG. 2, and only the operation of the normal drive pulse selection circuit 14 is different. In the third embodiment, when rotation and rotation failure are alternately counted on the terminal O1 side and the terminal O2 side in the non-rotation counter circuit 15, the normal drive pulse selection circuit 14 counts when the normal drive pulse is output immediately after the count. When the same normal driving pulse as before is output and both the terminal O1 side and the terminal O2 side are determined to have failed in rotation, the normal driving pulse having a driving force that is one rank higher than before counting is output from the normal driving pulse selection circuit 14. Output.

The above control operation will be described in detail from the actual rotation detection.
FIG. 11 shows a current waveform and a voltage waveform when the normal drive pulse SP3 having the maximum rank is output from the terminal O1, the magnetic field acts on the electronic timepiece of the third embodiment, and the rotor 10 can be rotated normally. FIG. FIG. 12 shows the waveform after 1 second of FIG. 11, the normal drive pulse SP3 having the highest rank is output from the terminal O2, the magnetic field acts on the electronic timepiece of the third embodiment, and the rotor 10 is normally operated. It is a current waveform and voltage waveform figure when it cannot rotate normally with the drive pulse SP. In FIG. 13, a normal driving pulse SP having a driving force lower than that of FIG. 11 is output from the terminal O1, the magnetic field acts on the electronic timepiece of the third embodiment, and the rotor 10 is normally operated with the normal driving pulse SP. It is a current waveform and voltage waveform figure when it was able to rotate. FIG. 14 shows a waveform after 1 second of FIG. 13. A normal driving pulse SP having a driving force lower than that of FIG. 12 is output from the terminal O 1 side, and a magnetic field acts on the electronic timepiece of the third embodiment from the outside. FIG. 6 is a current waveform and voltage waveform diagram when the rotor 10 cannot be rotated normally by a normal drive pulse SP.
FIGS. 11 (a), 12 (a), 13 (a), and 14 (a) are current waveforms induced in the coil 9 when a calendar load is applied. FIGS. (B), FIG. 13 (b) and FIG. 14 (b) are voltage waveforms generated at one terminal O1 of the coil 9 at this time, FIG. 11 (c), FIG. 12 (c), FIG. FIG. 14C shows a voltage waveform generated at the other terminal O 2 of the coil 9.

  Normally, a magnetic field is applied from the outside, the normal drive pulse SP3 having the maximum rank is output from the terminal O1, and the current waveform when the rotor rotates becomes a current waveform as shown in FIG. That is, the waveform shape shown in the induced current waveforms c3 and c4 follows the current waveform c1. Compared with the current waveform shown in FIG. 19A of the conventional example, the current waveform c3 is shifted to the front with the deviation of the stationary position of the rotor. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 11A, at 6 ms, the current waveform is already in the region of the current waveform c3, and the current value is in the positive direction. Therefore, as shown in FIG. 11C, the induced voltage V6 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 7 ms, the current waveform is in the region of the current waveform c3, and the induced voltage V7 is a detection signal exceeding the threshold value Vth. When the induced voltages V6 and V7 and the two detection signals exceed the threshold value Vth, the mode shifts to the second detection mode.

  Since the second detection mode is set by the induced voltage V7, a detection pulse at the next timing, that is, a detection pulse F8 at 8 ms is applied to the coil 9. As shown in FIG. 11A, at 8 ms, the current waveform is in the region of the current waveform c3, and the current value is in the positive direction. Therefore, as shown in FIG. 11B, the induced voltage V8 does not exceed the threshold value Vth. However, at 9 ms, the current waveform becomes the region of the current waveform c4, and the current value changes in the negative direction. Therefore, as shown in FIG. 11B, the induced voltage V9 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 10 ms, the current waveform is in the region of the current waveform c4, and the induced voltage V10 is a detection signal exceeding the threshold value Vth. The induced voltages V9 and V10 generated by the detection pulses F9 and F10 are detection signals that exceed the threshold value Vth. When the two detection signals of the induced voltages V9 and V10 exceed the threshold value Vth, the second detection mode determination circuit 13 determines that the rotation is successful, and the correction drive pulse FP is not output.

Usually, a magnetic field acts from the outside, the normal drive pulse SP3 of the maximum rank is output from the terminal O2, and the current waveform when the rotor does not rotate becomes a current waveform as shown in FIG. That is, the waveform shape shown in the induced current waveforms c2, c5, and c6 follows the current waveform c1. Compared to the current waveform shown in FIG. 20A, the current waveform c5 is a waveform that ends at an earlier point. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 12A, at 6 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 12C, the induced voltage V6 does not exceed the threshold value Vth. However, at 7 ms, the current waveform becomes the region of the current waveform c5, and the current value changes in the positive direction. Therefore, as shown in FIG. 12C, the induced voltage V7 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 8 ms, the current waveform is in the region of the current waveform c5, and the induced voltage V8 becomes a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V7 and V8 exceed the threshold value Vth, the mode is switched to the second detection mode.

  Since the second detection mode is set by the induced voltage V8, the detection pulse F9 at the next timing, that is, the detection pulse F9 at the time of 9 ms is applied to the coil 9. As shown in FIG. 12A, at 9 ms, the current waveform is in the region of the current waveform c5, and the current value is in the positive direction. Therefore, as shown in FIG. 12B, the induced voltage V8 does not exceed the threshold value Vth. The induced voltages V10 to V14 generated by the detection pulses F10 to F14 are also in the region of the current waveform c5 and do not exceed the threshold value Vth. Furthermore, the induced voltage V15 generated by the detection pulse F15 which is the seventh detection in the second detection mode is also in the region of the current waveform c5 and does not exceed the threshold value Vth. Therefore, the detection signal exceeding the threshold is not detected within the seven detection periods from the induced voltages V9 to V15. Therefore, the second detection mode determination circuit 13 determines that the rotation has failed and aborts the determination. As a result, the pulse selection circuit 7 selects the correction drive pulse FP and drives the step motor 20 to reliably rotate the rotor. In this way, when a magnetic field is applied from the outside, even if the normal drive pulse has the maximum rank, since the deviation of the static stable position of the rotor 10 is large, both rotation and non-rotation are detected on the terminal O1 side and the terminal O2 side. End up.

  Next, normally, when a magnetic field is applied from the outside and a normal driving pulse SP having a driving force lower than that in FIG. 11 is output from the terminal O1 side and the rotor rotates, a current waveform as shown in FIG. become. That is, the waveform shape shown in the induced current waveforms c2, c3, and c4 follows the current waveform c1. Compared to the current waveform shown in FIG. 11A, the current waveform c3 is shifted backward. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 13A, at 6 ms, the current waveform is in the region of the current waveform c2, and the current value is in the negative direction. Therefore, as shown in FIG. 13C, the induced voltage V6 does not exceed the threshold value Vth. However, at 7 ms, the current waveform becomes the region of the current waveform c3, and the current value changes in the positive direction. Therefore, as shown in FIG. 13C, the induced voltage V7 becomes a detection signal exceeding the threshold value Vth. Similarly, even at 8 ms, the current waveform is in the region of the current waveform c3, and the induced voltage V8 is a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V7 and V8 exceed the threshold value Vth, the mode is switched to the second detection mode.

  Since the second detection mode is set by the induced voltage V8, the detection pulse F9 at the next timing, that is, the detection pulse F9 at the time of 9 ms is applied to the coil 9. As shown in FIG. 13A, at 9 ms, the current waveform is in the region of the current waveform c3, and the current value is in the positive direction. Therefore, as shown in FIG. 13B, the induced voltage V8 does not exceed the threshold value Vth. The induced voltage V10 generated by the detection pulse F10 is also in the region of the current waveform c3 and does not exceed the threshold value Vth. However, at 11 ms, the current waveform becomes the region of the current waveform c4 as shown in FIG. 13 (a), the current value changes in the negative direction, and the induced voltage V11 generated by the detection pulses F11 and F12 as shown in FIG. 13 (b). , V12 is a detection signal exceeding the threshold value Vth. When the two detection signals of the induced voltages V11 and V12 exceed the threshold value Vth, the second detection mode determination circuit 13 determines that the rotation is successful, and the correction drive pulse FP is not output.

  Normally, a magnetic field acts from the outside, a normal driving pulse SP having a driving force lower than that in FIG. 12 is output from the terminal O2, and the current waveform when the rotor does not rotate is as shown in FIG. It becomes a current waveform. That is, the waveform shape shown in the induced current waveforms c5 and c6 follows the current waveform c1. Compared with the current waveform shown in FIG. 12A, the current waveform c2 does not appear, the current waveform c5 shifts forward, and the waveform ends at an earlier time point. Hereinafter, the detection operation in this case will be described. First, at the time of 6 ms, the first detection mode is started, and the detection pulse B6 is applied to the coil 9. As shown in FIG. 14A, at 6 ms, the current waveform is in the region of the current waveform c5, the current value is in the positive direction, and the induced voltage V6 exceeds the threshold value Vth as shown in FIG. It becomes a detection signal. Further, even at 7 ms, the current waveform is in the region of the current waveform c5, and the induced voltage V7 becomes a detection signal exceeding the threshold value Vth. When the induced voltages V6 and V7 and the two detection signals exceed the threshold value Vth, the mode shifts to the second detection mode.

  Since the second detection mode is set by the induced voltage V7, the detection pulse F8 at the next timing, that is, the detection pulse F8 at 8 ms is applied to the coil 9. As shown in FIG. 14A, at 8 ms, the current waveform is in the region of the current waveform c5 and the current value is in the positive direction, so that the induced voltage V8 exceeds the threshold value Vth as shown in FIG. 14B. There is no. Further, the induced voltages V9 to V11 are also in the region of the current waveform c5 and do not exceed the threshold value Vth. In 12 ms, which is the fifth detection in the second detection mode, the current waveform becomes the region of the current waveform c6 as shown in FIG. 14A, the current value changes in the negative direction, and the threshold value Vth is set only once at V12. However, since the next 13 ms is the time when the free vibration of the rotor 10 has already ended, the induced voltage V13 generated by the detection pulse F13 does not exceed the threshold value Vth as shown in FIG. Further, the induced voltage V14 generated by the detection pulse F14 that is the seventh detection in the second detection mode is the time when the free vibration of the rotor 10 has already ended, and therefore does not exceed the threshold value Vth. Therefore, the detection signal exceeding the threshold is detected only once within the seven detection periods from the induced voltages V8 to V14. Therefore, the second detection mode determination circuit 13 determines that the rotation has failed and aborts the determination. As a result, the pulse selection circuit 7 selects the correction drive pulse FP and drives the step motor 20 to reliably rotate the rotor.

  Thus, when a magnetic field acts from the outside, the rotor repeats rotation and non-rotation alternately even if the driving force of the normal driving pulse is increased. For this reason, the increase in the driving force of the normal driving pulse consumes power wastefully. In the present invention, in order to drive with the minimum effective power as much as possible, for example, during periods t1-t2, t3-t4, t5-t6 and periods t2-t3, t4-t5, t6-t7 in FIG. When the second detection mode determination circuit 13 determines rotation and rotation failure alternately, it is determined that a magnetic field or the like has been applied from the outside, and the normal drive pulse SP is obtained during the periods t3-t4, t5-t6, t7. Is not output, and the rank of the normal drive pulse is not changed. That is, a normal driving pulse having the same driving force as before non-rotation detection is output. As a result, by fixing the rank, it is possible to prevent an increase in power consumption due to a rank increase when it is determined as normal non-rotation. Further, during normal hand movement, the operating voltage of the driver circuit 8 may decrease, and the driving force of the step motor 20 may decrease. For example, when the second detection mode determination circuit 13 continuously determines rotation failure, When it is determined that there is no non-rotation continuously in the period t2-t3 to the period t3-t4 in FIG. 15A, the normal drive pulse SP2 having a driving force that is one rank higher is output during the period t4 when the next normal drive pulse is output. After that, it can be driven with the minimum effective power by outputting.

The above operation will be described with reference to a flowchart. FIG. 16 is a flowchart showing the rotor rotation detection method in the electronic timepiece according to the third embodiment, and shows the operation every second. Note that step numbers (ST *) in the flowchart are the same as those in FIG. The normal drive pulse SP is output at the timing of the second (step ST1), and the first detection mode is started 6 ms after the second (step ST2). In the first detection mode, it is determined whether or not a detection signal is detected, and after completion (step ST3), if the detection signal is generated twice, the second detection mode is immediately started (step ST4). As shown in the conventional example, if the detection signal does not occur once or does not occur, it is determined that the rotation has failed (step ST5), and a normal driving pulse having a driving force larger by one rank is output (step ST6). When shifting to the second detection mode, it is determined whether or not the detection signal is detected twice within the maximum number of detection times of 7 (step ST7), and the detection signal is detected twice within the maximum number of detection times of 7 In this case, it is determined that the rotation is successful (step ST8), and when the detection signal is not detected twice within the maximum number of detection times of 7, the rotation is determined to be failed (step ST9). If it is determined that the rotation has failed, the number of times that the rotation has been determined to be failed is counted (step ST10). If rotation and rotation failure are determined alternately, the rank of the normal drive pulse is fixed (step ST11). When the rotation failure is determined continuously, the rank of the normal drive pulse is changed. (Step ST12).

When rotation and non-rotation are detected alternately this time, the rank of the normal drive pulse after detection is fixed and the normal drive pulse SP of the same driving force as before the non-rotation detection is output. In the range where non-rotation is detected alternately, in order to further suppress the increase in power consumption in the external magnetic field, even if control is performed to reduce the effective power of the normal drive pulse by changing to a rank with a small driving force. Good. For example, when a disturbance such as an impact is applied or immediately after a load such as a calendar is applied, a normal drive pulse having a driving force that is several ranks larger than the initial state is temporarily output so that it can always be driven with the minimum energy. Keep doing. In this state, a magnetic field acts from the outside, and if the rank is fixed as described in the third embodiment, it can be driven with a small rank, but it continues to operate with the pulse driving force increased. End up consuming power. Therefore, when a magnetic field is applied from the outside, shifting the normal driving pulse to a rank with a small driving force leads to low power consumption. However, if rotation and non-rotation are detected alternately and the normal driving pulse is immediately shifted to a rank with a small driving force, a magnetic field acts from the outside, and if the magnetic field does not act in a short period of time, the driving force is small. The rank is repeatedly increased until it becomes possible to move the hand with a stable driving force from the rank, and at the same time, correction driving pulses with large current consumption are continuously output. To prevent that condition, especially if you have a large number of ranks,
You may change so that it may transfer to a rank with small driving force, after detecting rotation and non-rotation a predetermined number of times.

  In the above embodiment, rotation / non-rotation detection is performed using the induced voltage generated in the motor coil. However, even if rotation / non-rotation detection is performed using a magnetic sensor or the like to determine the magnetic pole of the rotor, It is possible to obtain the effects of the invention.

  In the above embodiment, when the rotation is normally detected with the normal driving pulse of the same rank about 256 times in order to drive with the minimum effective power, the driving force is reduced to the next lower rank. Yes.

As mentioned above, although embodiment of this invention was explained in full detail with drawing, each embodiment is only the illustration of this invention, and this invention is not limited only to the structure of embodiment. Accordingly, it is a matter of course that the present invention includes any design change within a range not departing from the gist of the present invention.
For example, the block diagram shown in FIG. 2 is an example, and other configurations may be provided as long as the above-described operation is performed.

Note that the current waveform varies depending on the electric characteristics of the step motor, the voltage value of the drive pulse, etc., that is, the output level and the temporal response change, but the number of times of determination of the first detection pulse in the embodiment, the second In this embodiment, the number of detection pulse determinations, the number of times the second detection mode is aborted (number of outputs of the second detection pulse), the threshold Vth, and the like are set to appropriate values according to the current waveform, regardless of the current waveform. The effect of can be obtained.
In the first to third embodiments, the two detection circuits of the first detection mode determination circuit 12 and the second detection mode determination circuit 13 rotate the rotor 10 in the first and second detection modes. Although rotation is detected, for example, the first detection mode determination circuit 12 is not provided, and only the second detection mode determination circuit 13 is used to make one determination as in an electronic timepiece that detects the rotation and non-rotation of the rotor 10. The present invention can also be applied to an electronic timepiece that detects rotation and non-rotation of a rotor by a circuit.

It is a flowchart figure which shows the concept of the control method in the electronic timepiece of the 1st Embodiment of this invention. It is a block diagram which shows the circuit structure of the electronic timepiece of the 1st-3rd embodiment of this invention. It is the electric current waveform and voltage waveform figure which generate | occur | produce in a coil when a hand with a big moment of inertia is attached to the electronic timepiece of the 1st Embodiment of this invention, and a rotor is determined to rotate. It is the electric current waveform and voltage waveform figure which generate | occur | produce in a coil when a hand with a big moment of inertia is attached to the electronic timepiece of the 1st Embodiment of this invention, and a rotor is misjudged as non-rotating. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when the rotor of the electronic timepiece of the 1st Embodiment of this invention has not rotated. It is a time chart figure of the electronic timepiece of the 1st embodiment of the present invention. It is a flowchart figure which shows the control method of the electronic timepiece of the 1st Embodiment of this invention. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when load, such as a calendar, acts on the electronic timepiece of the 2nd Embodiment of this invention, and the effective electric power of a normal drive pulse is driven high. It is a time chart figure of the electronic timepiece of the 2nd embodiment of the present invention. It is a flowchart figure which shows the control method of the electronic timepiece of the 2nd Embodiment of this invention. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when a magnetic field acts on the electronic timepiece of the 3rd Embodiment of this invention from the outside, and when the effective electric power of a normal drive pulse is driven high. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when a magnetic field acts on the electronic timepiece of the 3rd Embodiment of this invention from the outside, and when the effective electric power of a normal drive pulse is driven high. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when a magnetic field acts on the electronic timepiece of the 3rd Embodiment of this invention from the outside. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when a magnetic field acts on the electronic timepiece of the 3rd Embodiment of this invention from the outside. It is a time chart figure of the electronic timepiece of the 3rd Embodiment of this invention. It is a flowchart figure which shows the control method of the electronic timepiece of the 3rd Embodiment of this invention. It is a block diagram which shows the circuit structure of the conventional electronic timepiece. It is a pulse waveform figure which the circuit of the electronic timepiece of the past and the 1st-3rd embodiment of the present invention generates. It is the current waveform and voltage waveform figure which generate | occur | produce in a coil when the rotor of the conventional electronic timepiece can be rotated. It is the current waveform and voltage waveform figure which generate | occur | produce in the coil when the rotor of the electronic timepiece of the past and the 2nd Embodiment of this invention was not able to rotate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oscillation circuit 2 Frequency division circuit 3 Normal drive pulse generation circuit 4 Correction drive pulse generation circuit 5 1st detection pulse generation circuit 6 2nd detection pulse generation circuit 7 Pulse group selection circuit 8 Driver circuit 20 Step motor 9 Coil 10 Rotor 11 Detection Circuit 12 First detection mode determination circuit 13 Second detection mode determination circuit 14 Normal drive pulse selection circuit 15 Non-rotation counter circuit SP, SP2, SP3 Normal drive pulse FP Correction drive pulse B6 to B12 Detection pulse F8 to F18 Detection pulse c1, c2, c3, c4, c5, c6, cx, cy Current waveform V6 to V16 Induced voltage

Claims (4)

A step motor having a coil and a rotor;
Drive pulse generating means for generating a drive pulse for driving the step motor;
Step motor driving means for driving the step motor based on the driving pulse;
Detecting means for detecting rotation and non-rotation of the rotor after the driving pulse is output from the driving pulse generating means;
Drive pulse control means for controlling the drive pulse generation means so as to change the effective power of the drive pulse based on the detection means detecting non-rotation of the rotor a plurality of times ,
The drive pulse control means includes
Based on the detection unit detecting non-rotation of the rotor a predetermined number of times or more in a predetermined detection period, the amount by which the effective power of the drive pulse is increased is adjusted according to the number of detections of non-rotation of the rotor. An electronic timepiece characterized by performing control to perform . A step motor having a coil and a rotor;
Drive pulse generating means for generating a drive pulse for driving the step motor;
Step motor driving means for driving the step motor based on the driving pulse;
Detecting means for detecting rotation and non-rotation of the rotor after the driving pulse is output from the driving pulse generating means;
Drive pulse control means for controlling the drive pulse generation means so as to change the effective power of the drive pulse based on the detection means detecting non-rotation of the rotor a plurality of times,
The driving pulse control section, said detection means, in the case of detecting continuously non rotation of the rotor,
An electronic timepiece that performs control for adjusting an amount by which the effective power of the drive pulse is increased in accordance with the number of consecutive non-rotations. The detection means includes
First detection means for detecting rotation and non-rotation of the rotor in a first period after the drive pulse generating means outputs the drive pulse;
In the second period following said first period, and the second detection means for detecting the rotation and non-rotation of the rotor, in any one of claims 1 to 2, characterized in that it has a The electronic watch described. When the detection means detects non-rotation of the rotor,
Electronic timepiece according to any one of claims 1 to 3, characterized in that it has a correction drive pulse generating means for outputting a correction driving pulse correcting driving the step motor.

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