WO2015141511A1 - 電子時計 - Google Patents
電子時計 Download PDFInfo
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- WO2015141511A1 WO2015141511A1 PCT/JP2015/056854 JP2015056854W WO2015141511A1 WO 2015141511 A1 WO2015141511 A1 WO 2015141511A1 JP 2015056854 W JP2015056854 W JP 2015056854W WO 2015141511 A1 WO2015141511 A1 WO 2015141511A1
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- detection
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- normal
- normal pulse
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- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
- G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
- G04G19/12—Arrangements for reducing power consumption during storage
Definitions
- the present invention relates to an electronic timepiece in which a pointer is driven by a step motor, and more particularly, to an electronic timepiece having a step motor fast-forwarding means.
- a pointer is generally driven by a step motor (also referred to as a stepping motor or a pulse motor).
- This step motor is composed of a stator that is magnetized by a coil and a rotor that is a disc-shaped rotating body magnetized with two poles.
- fast-forwarding that moves the pointer at high speed for time adjustment, etc. The operation is generally performed.
- Patent Document 1 in the drive step motor, captures the reverse induced power excited by the rotation of the rotor as a current or voltage, and detects the first peak, confirming the presence or absence of rotation of the thus rotor detection While driving pulses are supplied, fast-forwarding operation is realized.
- the insensitive time mass time
- the detection timing is optimized. It is shown that
- Patent Document 1 since the technique presented in Patent Document 1 has only one detection condition for detecting the counter-induced power excited by the rotation of the rotor, the detection waveform fluctuation (that is, the rotation fluctuation of the rotor) can be detected with high accuracy. Can not do it. For this reason, when the rotation of the rotor becomes unstable due to a disturbance such as an external magnetic field, the rotation state of the rotor cannot be accurately grasped, so that an appropriate fast-forward drive cannot be performed and it is difficult to speed up the fast-forward operation. In fast-forward operation, supplying more drive power than necessary to the step motor leads to shortening the battery life of the electronic timepiece. However, since the conventional detection means cannot detect rotation with high accuracy, the drive power However, there is a problem that it is difficult to drive at low power.
- the object of the present invention is to solve the above-mentioned problems and provide an electronic timepiece that realizes the fastest fast-forward operation of a step motor and enables low power driving in accordance with various environments where the timepiece is placed. That is.
- the electronic timepiece of the present invention adopts the following configuration.
- An electronic timepiece detects a step motor, a normal pulse generation circuit that outputs a normal pulse for driving the step motor, and whether the step motor has rotated after the step motor is driven with the normal pulse.
- a detection pulse generation circuit that outputs a detection pulse, a pulse selection circuit that selectively outputs a normal pulse and a detection pulse, a driver circuit that loads the pulse output from the pulse selection circuit to a step motor, and a detection that is generated by the detection pulse It has a rotation detection circuit that inputs a signal and determines whether or not the step motor has rotated, and a frequency selection circuit that determines the drive interval of the normal pulse, and the detection pulse generation circuit puts the detection pulse into a predetermined interval.
- the rotation detection circuit divides the detection into detection intervals corresponding to the predetermined interval, and performs detection for the interval in which the detection signal is detected. To choose the frequencies, characterized in that it instructs the frequency selection circuit.
- the rotation detection circuit is characterized by performing detection in a plurality of detection sections and changing detection conditions in other detection sections according to the detection result in one detection section.
- the detection condition in the detection section includes at least one of the section width of the detection section and the number of detection signals to be detected in the detection section.
- the normal pulse generation circuit is configured to be able to output a plurality of normal pulses with different driving forces, and the rotation detection circuit selects a normal pulse based on the determination result of whether or not the step motor has rotated, and the normal pulse The generation circuit is instructed.
- the rotation detection circuit is characterized by instructing the frequency selection circuit of a frequency corresponding to the normal pulse selected and instructed.
- the rotation detection circuit is characterized in that the detection condition in each detection section is changed in accordance with the normal pulse selected and instructed.
- the rotation detection circuit changes the drive power of normal pulses when the number of times of output of normal pulses at a specific drive force reaches a predetermined number. The driving force is selected.
- the rotation detection circuit changes the normal pulse driving force so as to lower the normal pulse driving force when the normal pulse driving interval determined by the frequency selection circuit is relatively short, and the normal pulse determined by the frequency selection circuit.
- the driving force of the normal pulse is changed so as to increase the driving force of the normal pulse.
- the detection pulse generation circuit generates a first detection pulse for detecting a current waveform (hereinafter referred to as a back peak) generated first on the side different from the normal pulse by the back electromotive force generated by driving with the normal pulse.
- the first detection pulse generation circuit that detects the current waveform that occurs after the back crest on the same side as the normal pulse (hereinafter, the crest in the table) is detected on the same side as the normal pulse.
- a rotation detection circuit that generates at least one of a first detection signal generated by the first detection pulse and a second detection signal generated by the second detection pulse. Based on the above, the frequency selection circuit is instructed.
- the detection pulse generation circuit detects a current waveform (hereinafter referred to as a dummy table peak) generated immediately after the normal pulse on the same side as the normal pulse by the back electromotive force generated by driving with the normal pulse.
- a rotation detection circuit that generates at least one of the first detection signal, the second detection signal, and the third detection signal generated by the third detection pulse. Based on the above, the frequency selection circuit is instructed.
- the present invention is characterized by having a factor detection circuit that indicates at least one of the frequency determined by the frequency selection circuit and the driving force of the normal pulse output from the normal pulse generation circuit by factor detection.
- the factor detection circuit is a power supply voltage detection circuit.
- a correction pulse generation circuit that generates a correction pulse and outputs the correction pulse to the pulse selection circuit.
- the rotation detection circuit instructs the pulse selection circuit to output the correction pulse when it is determined that the step motor is not rotating.
- the frequency selection circuit is instructed of a frequency at which a correction pulse can be output.
- the rotation detection circuit detects a timing at which the first detection signal is no longer detected after the first detection signal generated by the first detection pulse is detected, and notifies the second detection pulse generation circuit of the detected timing.
- the two detection pulse generating circuit generates the second detection pulse after the timing.
- An electronic timepiece detects a step motor, a normal pulse generation circuit that outputs a normal pulse for driving the step motor, and whether the step motor has rotated after the step motor is driven with the normal pulse.
- a detection pulse generation circuit that outputs a detection pulse, a pulse selection circuit that selectively outputs a normal pulse and a detection pulse, a driver circuit that loads the pulse output from the pulse selection circuit to a step motor, and a detection that is generated by the detection pulse
- a rotation detection circuit that inputs a signal and determines whether or not the step motor has rotated.
- the detection pulse generation circuit is a counter electromotive force generated by driving with a normal pulse, and is different from the normal pulse.
- a first detection pulse generation circuit for generating a first detection pulse for detecting a current waveform generated first, and a normal pulse drive.
- a second detection pulse generating circuit for generating a second detection pulse for detecting a current waveform generated after the back peak on the same side as the normal pulse by the electromotive force. After the first detection signal generated by the detection pulse is detected, the timing at which the first detection signal is no longer detected is detected and notified to the second detection pulse generation circuit. A second detection pulse is generated.
- the back electromotive force generated from the step motor is detected by dividing it into a plurality of detection sections, and the driving interval and driving force of the driving pulse are selected according to the detection result in each detection section.
- a feature of the first embodiment is a basic configuration example of the present invention, in which a back peak and a front peak of a back electromotive force generated from a step motor are detected in a plurality of detection sections, and the rotation of the rotor is detected. Is to determine the speed.
- the feature of the second embodiment is to quickly and widely grasp the rotation state of the rotor by detecting the back peak of the back electromotive force generated from the step motor by dividing it into two detection sections.
- a feature of the third embodiment is that a dummy front peak, a back peak and a front peak of a counter electromotive force generated from a step motor are divided into three detection sections and detected with high accuracy.
- the feature of the fourth embodiment is to quickly determine the rotational speed of the rotor in accordance with the detection end position of the back peak of the counter electromotive force generated from the step motor.
- FIG. 1 A schematic configuration of the electronic timepiece of the first embodiment will be described with reference to FIG.
- the electronic timepiece according to the first embodiment has a feature that a back peak and a front peak of a back electromotive force generated from a step motor are divided into a plurality of detection sections and detected with high accuracy.
- reference numeral 1 denotes the electronic timepiece according to the first embodiment.
- the electronic timepiece 1 includes an oscillation circuit 2 that outputs a predetermined reference signal P1 by a crystal oscillator (not shown), and a frequency dividing circuit 3 that inputs the reference signal P1 and outputs timing signals T1 to T4 to the respective circuits.
- a frequency selection circuit 4 that outputs a drive interval control signal P2, a normal pulse generation circuit 5 that outputs a normal pulse SP, a correction pulse generation circuit 6 that outputs a correction pulse FP, and a detection pulse that outputs a plurality of detection pulses DP1 and DP2.
- a generation circuit 10 a pulse selection circuit 7 for inputting a normal pulse SP, detection pulses DP1, DP2, etc.
- Step motor 30 that inputs a driving pulse DR and moves a pointer (not shown), detection signals DS1, D from the step motor 30 Composed of such rotation detecting circuit 40 for rotation detection of the rotor by entering 2.
- the electronic timepiece 1 is an analog display type timepiece that displays the time by hands, and has a battery, an operation member, a train wheel, hands, and the like as a power source, but these are not directly related to the present invention. Illustration is omitted.
- the detection pulse generation circuit 10 includes a first detection pulse generation circuit 11 and a second detection pulse generation circuit 12.
- the first detection pulse generation circuit 11 is a first detection that detects a back peak generated on the side (reverse polarity) different from the normal pulse SP by a back electromotive force generated when the step motor 30 is driven by the normal pulse SP.
- the pulse DP1 is output.
- the second detection pulse generation circuit 12 outputs a second detection pulse DP2 for detecting a front peak generated after the back peak on the same side (same polarity) as the normal pulse SP.
- the rotation detection circuit 40 includes a first detection determination circuit 41 and a second detection determination circuit 42.
- the first detection determination circuit 41 receives the first detection signal DS1 generated by the first detection pulse DP1 and checks the detection position, and also receives the first detection signal DS1 and the detected number of detections. And a first detected number counter 41b.
- the second detection determination circuit 42 receives the second detection signal DS2 generated by the second detection pulse DP2 and checks the detection position, and similarly receives the second detection signal DS2 and detects it.
- a second detected number counter 42b for checking the number of shots.
- the rotation detection circuit 40 grasps the generation positions and the number of generations of the first and second detection signals DS1 and DS2 from the measurement information obtained by the plurality of counters described above, and determines the driving interval of the normal pulse SP according to the information.
- a frequency selection signal P5 indicating the frequency to be output is output to the frequency selection circuit 4.
- the frequency selection circuit 4 selects a specific frequency according to the frequency selection signal P5, and the normal pulse generation circuit 5, the correction pulse generation circuit 6, and the detection using the selected frequency as the drive interval control signal P2. Output to the pulse generation circuit 10.
- the normal pulse generation circuit 5 receives the drive interval control signal P2 and outputs a normal pulse SP using this signal as a trigger. For example, if a frequency with a period of 6 mS (that is, about 167 Hz) is selected by the frequency selection circuit 4, the drive interval control signal P2 is supplied as a signal with a period of 6 mS to the normal pulse generation circuit 5, and the normal pulse generation circuit 5 Then, the next normal pulse SP is output after 6 mS using the drive interval control signal P2 as a trigger.
- a frequency with a period of 6 mS that is, about 167 Hz
- the rotation detection circuit 40 measures the generation position and the generation number of the first and second detection signals DS1 and DS2 by the plurality of counters described above, and determines the rotation state of the step motor 30 and whether or not the rotation has occurred from the information.
- the rank signal P6 for selecting the rank of the duty of the normal pulse SP is output to the normal pulse generation circuit 5 based on the determination result.
- the normal pulse generating circuit 5 can change the driving force of the driving pulse DR supplied to the step motor 30 by switching the duty of the normal pulse SP by the rank signal P6.
- the driver circuit 20 includes two buffer circuits (not shown), and outputs the normal pulse SP or the correction pulse FP as the drive pulse DR from the two output terminals O1 and O2, thereby driving the step motor 30.
- the driver circuit 20 operates so that the two output terminals O1 and O2 are both opened (high impedance) for the first and second detection pulses DP1 and DP2 only during the short pulse width.
- both ends of the coil (described later) of the step motor 30 are opened for a short period of time due to the first and second detection pulses DP1 and DP2, so that a counter electromotive force generated in the coil appears during the open period.
- the pulsed back electromotive force is input to the rotation detection circuit 40 as the first and second detection signals DS1 and DS2. That is, the first and second detection signals DS1 and DS2 are pulse-like signals generated at the same timing by the first and second detection pulses DP1 and DP2. Details of the first and second detection pulses DP1 and DP2 and the first and second detection signals DS1 and DS2 will be described later.
- the step motor 30 includes a rotor 31, a stator 32, a coil 33, and the like.
- the rotor 31 is a disk-shaped rotating body magnetized with two poles, and is magnetized with N and S poles in the radial direction.
- the stator 32 is made of a soft magnetic material, and semicircular portions 32a and 32b surrounding the rotor 31 are divided by slits.
- a single-phase coil 33 is wound around a base portion 32e to which the semicircular portions 32a and 32b are coupled. Single phase means that there is one coil and two input terminals C1 and C2 for inputting the drive pulse DP.
- concave notches 32h and 32i are formed at predetermined positions on the inner peripheral surfaces of the semicircular portions 32a and 32b of the stator 32. Due to the notches 32h and 32i, the static stable point of the rotor 31 (indicated by the straight line A) is shifted from the electromagnetic stable point of the stator 32 (indicated by the straight line A). The angle difference due to the deviation is referred to as an initial phase angle ⁇ i, and the rotor 31 is brazed so as to easily rotate in a predetermined direction by the initial phase angle ⁇ i.
- the horizontal axis is time
- the normal pulse SP is constituted by a plurality of continuous pulse groups as shown in the figure, and the pulse width (ie, duty) of this pulse group is variable.
- the normal pulse SP is alternately supplied as the drive pulse DR to the input terminals C1 and C2 of the step motor 30, whereby the stator 32 is alternately reversed and magnetized to rotate the rotor 31.
- the rotational speed of the rotor 31 can be increased or decreased by changing the repetition period of the normal pulse SP, and the driving force (rotational force) of the step motor 30 is adjusted by changing the duty of the normal pulse SP. Can do.
- the current waveform i1 in the driving period T1 to which the normal pulse SP is supplied becomes a current waveform in which the driving current and the induced current due to the plurality of pulse groups overlap each other, and in the decay period T2 after the end of the normal pulse SP, the rotor An induced current is generated by the damped oscillation of 31.
- the curved arrow D in FIG. 2A indicates that the rotor 31 cannot return to its original position because the step motor 30 is supplied with the normal pulse SP due to some influence such as an external magnetic field.
- the trajectory in the case of The current waveform i2 in FIG. 2B is an example of an induced current that flows through the coil 33 when the rotor 31 cannot rotate normally.
- the current waveform i2 in the decay period T2 when the rotor 31 cannot be rotated generates an induced current having a smaller amplitude and a different period than the current waveform i1 described above.
- the back electromotive force in the decay period T2 after the end of the normal pulse SP shown in FIG. 2B is detected in detail by dividing it into a plurality of detection sections, and the rotational state of the rotor 31 is grasped with high accuracy.
- An electronic timepiece that aims to drive the step motor 30 as fast as possible according to various environments where the timepiece is placed is provided.
- the step motor 30 is used in all of the first to 45th embodiments described later.
- FIG. 3 [Description of basic operation of rotor rotation detection: FIG. 3]
- the basic operation of how the present invention detects the rotation state of the rotor 31 will be described using the current waveform i1 in the case of normal rotation shown in FIG. 2B as an example.
- the rotor 31 rotates 180 degrees as indicated by the arrow C, and thereafter oscillates damped (see FIG. 2A).
- the current waveform i1 in the decay period T2 after the end of the normal pulse SP will be described in detail.
- the current is induced on the opposite side to the normal pulse SP (plus side with respect to GND) by the damping vibration of the rotor 31. A current flows, and the peak shape of this current is called “back mountain”.
- an induced current flows on the same side as the normal pulse SP (minus side with respect to GND) due to the damped vibration of the rotor 31, and the peak shape of this current is referred to as “front peak”.
- the basis of the present invention is to sample the position and period of this back peak and front peak with detection pulses consisting of a plurality of detection sections, and to detect in detail, thereby grasping the rotational state of the rotor 31 with high accuracy. .
- dummy table mountain (hereinafter abbreviated as a dummy). This dummy appears when the rotor 31 has not finished rotating 180- ⁇ i degrees (see FIG. 2A) even when the drive pulse SP ends (when the rotation of the rotor is slow).
- the first detection pulse DP1 in FIG. 3 indicates that three pulses (DP11 to DP13) are output in one detection interval.
- a section in which the first detection pulse DP1 is output is referred to as a first detection section G1.
- the first detection pulse DP1 opens the coil 33 for a short period of time, and the first detection signal DS1 is generated from the input terminals C1 and C2, but the first DP11 is a dummy of the current waveform i1. Since it is output in the area, DS11 generated by this DP11 is on the minus side of GND, and the back mountain is not detected.
- the second and third DP12 and DP13 are output in the area of the mountain behind the current waveform i1, the DS12 and DS13 generated by the DP12 and DP13 become Vth on the plus side of GND. Therefore, it is determined that a back mountain has been detected. That is, in the example shown in FIG. 3, the back peaks are detected at the second and third shots of the first detection signal DS1 in the first detection section G1.
- the first detection section G1 for detecting the back mountain is set to a period during which the back mountain may occur (that is, a period during which the first detection signal DS1 can be detected).
- the detection of the current waveform i by the counter electromotive force generated from the step motor 30 actually converts the current waveform i into a voltage waveform inside the rotation detection circuit 40, and the voltage waveform is set to Vth (FIG. 3) set in advance. It is determined by whether or not the reference is exceeded.
- a second detection interval G2 is set and a predetermined second detection pulse DP2 is output during a period in which a table peak may occur, and a table peak is detected.
- the third detection period G3 is set during a period in which a dummy is likely to occur, and a predetermined third detection pulse DP3 is output to detect the dummy.
- the present invention outputs the first detection pulse DP1 and the second detection pulse DP2 by dividing them into predetermined detection intervals, and according to the detection result in the detection intervals, the driving interval (frequency) and duty of the normal pulse SP. Is selected to realize the fastest possible fast-forward operation of the step motor.
- each detection interval may be divided into smaller intervals.
- the first detection section G1 for detecting the back mountain is divided into the first half G1a and the second half G1b, and the drive interval of the normal pulse SP is selected according to the detection result in the divided detection section. Also good. Thereby, fine drive control according to the rotation state of the rotor 31 can be realized.
- the repetition period t1 (see FIG. 3) of the detection pulse DP in each detection section may be arbitrarily selected according to the current waveform to be detected. If the period t1 is short, the current waveform can be sampled finely, and the period t1 If the length is increased, sampling of the current waveform becomes coarse.
- the pulse width of the detection pulse DP is not limited, but a pulse width necessary for generating the detection signal DS is set.
- FIGS. 4 to 6 show the current waveform i due to the counter electromotive force generated from the step motor 30, the normal pulse SP supplied to the input terminals C1 and C2 of the step motor 30, and the input terminals C1 and C2.
- An example of the first and second detection signals DS1 and DS2 generated in C2 is schematically shown.
- FIG. 5A shows a case where the driving interval TS of the normal pulse SP is set to about 5.4 mS
- FIG. 5B shows that the driving interval TS of the normal pulse SP is set to about 6.0 mS
- FIG. 6 shows an example in which the rotor 31 is determined to have failed to rotate. Note that the configuration of the electronic timepiece 1 is described with reference to FIG.
- the normal pulse SP is generated from the normal pulse generation circuit 5, and the normal pulse SP ⁇ b> 1 as the drive pulse DR is output from the output terminal O ⁇ b> 1 of the driver circuit 20 via the pulse selection circuit 7. It is supplied to the terminal C1 (step S1).
- the normal pulse SP1 is composed of a plurality of pulse groups with a predetermined duty in the driving period T1.
- the first detection pulse generation circuit 11 outputs three first detection pulses DP1 for detecting the back mountain as the first detection section G1, and the first detection determination circuit 41 is the first detection position. It is determined whether or not three back peaks have been detected by the counter 41a and the first detection number counter 41b (step S2).
- step S7 if the determination is affirmative (three shots are detected), the process proceeds to the next step S3, and if the determination is negative (no detection), it is determined that the rotation has failed and the process proceeds to step S7.
- the driving period T ⁇ b> 1 ends and after the decay period T ⁇ b> 2 starts three first detection signals DS ⁇ b> 1 exceed Vth as an example in the first detection period G ⁇ b> 1 and a back mountain is detected. (3 DS1s are indicated by a circle).
- the second detection pulse generation circuit 12 detects three peaks of the second detection pulse DP2 that detects a crest in the front half G2a of the second detection section G2 (hereinafter abbreviated as the first half of the second section G2a).
- the second detection determination circuit 42 determines whether or not a crest in the table has been detected within three shots by the second detection position counter 42a and the second detection number counter 42b (step S3).
- FIG. 5A shows that the crest of the table is detected with the second detection signal DS2 generated by the second detection pulse DP2 in the first half G2a of the second section exceeding Vth at the third shot. (The first and second shots of DS2 are indicated by x and the third shot is indicated by ⁇ ).
- step S3 if step S3 is an affirmative determination, the rotation detection circuit 40 uses the frequency selection signal P5 to select the frequency at which the drive interval TS of the normal pulse SP is about 5.4 mS, which is the highest speed.
- the selection circuit 4 is instructed (step S4).
- the frequency selection circuit 4 supplies the normal pulse generation circuit 5 with the drive interval control signal P2 having a drive interval TS of about 5.4 mS, and therefore supplies it to the input terminal C1 as shown in FIG.
- step S4 returns to step S1 if an affirmative determination is always made in step S2 and step S3, the processing from step S1 to step S4 is continued, and the normal pulse SP has a driving interval TS of about 5.4 mS.
- the output is continued at high speed, and the step motor 30 can continue to rotate at the maximum speed.
- the reason why the normal pulse SP is output at the highest speed in the affirmative determination in step S3 is that, after detecting three back peaks in the first detection section G1, the top of the table is within 3 shots in the first half G2a of the second section. This is because it is determined that the rotation of the rotor 31 is smooth and vigorous, and the step motor 30 is in a state capable of supporting the highest speed rotation drive.
- step S3 the second detection pulse generation circuit 12 detects the peak in the table as the second half G2b of the second detection section G2 (hereinafter abbreviated as the second section second half G2b).
- the second detection pulse DP2 is output, and the second detection determination circuit 42 determines whether or not the peak in the table is detected by the second detection position counter 42a and the second detection number counter 42b. Step S5). If the determination is affirmative (detected at the fourth shot), the process proceeds to step S6. If the determination is negative (not detected), it is determined that the rotation has failed and the process proceeds to step S7.
- none of the three second detection signals DS2 is detected in the first half G2a of the second section, and the fourth second detection signal DS2 is Vth in the second half of the second section G2b.
- the peaks in the table have been detected beyond (the first to third DS2 shots are indicated by x and the fourth DS2 shot is indicated by ⁇ ).
- step S5 the rotation detection circuit 40 uses the frequency selection signal P5 to select a frequency at which the drive interval TS of the normal pulse SP is about 6.0 mS slower than the maximum speed.
- the frequency selection circuit 4 is instructed (step S6).
- the frequency selection circuit 4 supplies the drive interval control signal P2 with the drive interval TS of about 6.0 mS to the normal pulse generation circuit 5, so that it is supplied to the input terminal C1 as shown in FIG. 5B.
- step S6 returns to step S1, if an affirmative determination is made in step S2, a negative determination is made in step S3, and an affirmative determination is made in step S5, the processing from step S1 to step S6 is continued, and the normal pulse SP is changed to the drive interval.
- the reason why the normal pulse SP is output at about 6.0 mS, which is slower than the highest speed, in the affirmative determination in step S5 is that the peak in the table cannot be detected within 3 shots of the first half G2a of the second section, and the second half of the second section G2b This is because it can be determined that the rotation of the rotor 31 is slightly slow for some reason. That is, when the rotation of the rotor 31 is slow, if the next normal pulse SP is supplied at the highest speed, a rotation error of the rotor 31 may occur. Therefore, the drive interval of the normal pulse SP depends on the rotation state of the rotor 31. TS can be adjusted to prevent rotation errors.
- step S2 if a negative determination is made in step S2 or step S5, it is determined that the rotor 31 has failed to rotate, whereby the detection pulse generation circuit 10 stops generating subsequent detection pulses,
- the rotation detection circuit 40 instructs the frequency selection circuit 4 to output a frequency (for example, a period of 32 mS) in order to output the correction pulse FP.
- the frequency selection circuit 4 outputs the selected frequency to the correction pulse generation circuit 6 as the drive interval control signal P2, and the correction pulse FP is output from the correction pulse generation circuit 6 (step S7).
- FIG. 6 shows the timing operation when a negative determination is made in step S5 (ie, rotation failure).
- the normal pulse SP1 is supplied to the input terminal C1 (after T1)
- a back peak is detected by three first detection signals DS1 in the first detection section G1 ( Next, the DS1 of three shots is indicated by a circle), and then the peak of the table is not detected by the second detection signal DS2 of the third shot in the first half G2a of the second section, and the second detection signal of the fourth shot in the second half G2b of the second section DS2 indicates that no peaks in the table were detected (the first to third and fourth shots of DS2 are indicated by x).
- both the first half G2a of the second section and the second half of the second section G2b could not detect the peaks in the table, so it was determined that the rotor 31 failed to rotate, and the same input terminal C1 to which the normal pulse SP1 was supplied is an example.
- a correction pulse FP having a wide pulse width and a strong driving force is supplied after about 32 mS, a rotation error of the rotor 31 is corrected.
- the rotation detection circuit 40 selects a frequency at which the drive interval TS of the normal pulse SP is about 62.5 mS in order to decelerate the fast-forward operation of the rotor 31.
- the frequency selection circuit 4 is instructed by the frequency selection signal P5 (step S8).
- the rotation detection circuit 40 determines whether the duty rank of the normal pulse SP is the maximum (step S9).
- the duty of the normal pulse SP has a plurality of ranks, and is ranked from the rank having the smallest driving force (that is, the smallest duty) to the rank having the largest driving force (that is, the largest duty). Can be selected.
- step S9 If the determination in step S9 is affirmative (maximum rank), a rotation error has occurred even in the maximum rank, and the minimum rank is once set to return to the minimum rank (step S10). If step S9 is negative, a rotation error has occurred in the current rank, so the rank is increased (ie, the duty is increased: step S11) in order to increase the driving force of the normal pulse SP. That is, the rotation detection circuit 40 can instruct the normal pulse generation circuit 5 to select the duty of the normal pulse SP based on the determination result of whether or not the step motor 30 has rotated.
- the number of duty ranks is arbitrary, but 8 ranks to 16 ranks are set as an example.
- step S10 or step S11 the process returns to step S1 as the next processing, and the operation of outputting the next normal pulse SP is continued.
- step S2 the operation after step S2 is continued. For example, if a crest in the table is detected within 3 shots in step S3, it is determined that the rotor 31 has rotated normally and the driving interval TS is determined in step S4. Is set to about 5.4 mS, which is the highest speed, and the rotor 31 resumes rotation at the highest speed.
- the detection condition (for example, the detection section width, the number of detections, etc.) may be changed and adjusted so that the rotation of the rotor 31 can be detected more appropriately. For example, if the minimum rank is set in step S10, there is a possibility that the rotation of the rotor 31 may be slow. Therefore, the peak detection condition in the table in the subsequent step S5 is relaxed, and the second detection pulse is detected in the second half G2b of the second section. It is possible to detect up to the fifth shot of DP2 and to change to such as determining that the rotor 31 has rotated if a peak in the table can be detected under that condition.
- the detection condition For example, the detection section width, the number of detections, etc.
- the counter electromotive force generated from the step motor 30 is detected by dividing it into a plurality of detection sections, and the detection signal for detecting the back peak of the current waveform and the front peak is detected.
- the driving interval TS (frequency) and driving force (duty) of the driving pulse SP are selected according to the generation position, that is, the detection position, the detected number, etc., according to various environments where the clock is placed.
- An electronic timepiece that realizes the fastest possible fast-forward operation can be provided.
- the drive intervals TS of the normal pulse SP are not limited, and may be arbitrarily selected according to the performance of the step motor 30 and the specifications of the electronic timepiece.
- FIGS. 7 and 8 [Description of Rotation Detection Operation of Modified Example of First Embodiment: FIGS. 7 and 8]
- the electronic timepiece according to the modification of the first embodiment detects a back peak and a front peak of a back electromotive force generated from a step motor in a plurality of detection sections, and detects a front peak. Is divided into a plurality of sections, and the divided detection sections are configured to extend over other adjacent detection sections, so that the rotational state of the rotor can be detected finely.
- FIG. 8 is divided into FIG. 8-1 with FIGS. 8A and 8B and FIG. 8-2 with FIG. 8C.
- the second detection interval G2 for detecting the crest of the table is detected as three detections of the second interval first half G2a, the second interval middle G2c, and the second interval second half G2b.
- the first half G2a of the second section is divided into the first and second shots of the second detection pulse DP2
- the middle G2c of the second section is divided into the second and third shots of the second detection pulse DP2
- the second half of the second section G2b is divided.
- the second and fourth detection pulses DP2 are configured. That is, the detection pulses constituting each detection section extend over adjacent detection sections.
- FIG. 8 schematically illustrates an example of the current waveform i due to the counter electromotive force generated from the step motor 30 and the first and second detection signals DS1 and DS2 generated at the input terminals C1 and C2 of the step motor 30. Is shown. The normal pulse SP is not shown.
- FIG. 8A shows a case where two peaks are detected in the first half G2a of the second section
- FIG. 8B shows a case where two peaks are detected in the second section middle G2c
- FIG. 8C shows a case where two peaks can be detected in the second half G2b of the second section.
- step motor 30 is in a fast-forwarding operation as a premise for explanation. Further, among the steps, steps having the same operations as those in the flowchart of the first embodiment (see FIG. 4) described above are denoted by the same reference numerals, and detailed description thereof is omitted.
- a normal pulse SP is generated from the normal pulse generation circuit 5 and supplied to the step motor 30 to drive the step motor 30 (step S1).
- the first detection pulse generation circuit 11 outputs three first detection pulses DP1 for detecting the back mountain as the first detection section G1, and the first detection determination circuit 41 outputs the back mountain. It is determined whether or not three shots have been detected (step S2). If the determination is affirmative (three shots are detected), the process proceeds to the next step S21. If the determination is negative (no detection), it is determined that the rotation has failed and the process proceeds to step S7.
- the first detection signal DS1 of three shots exceeds Vth as an example in the first detection period G1. This indicates that a back mountain has been detected (three DS1s are indicated by a circle).
- the second detection pulse generation circuit 12 outputs two second detection pulses DP2 for detecting the peaks in the first half of the second section G2a, and the second detection determination circuit 42 It is determined whether or not two shots have been detected (step S21). If the determination is affirmative (two shots are detected), the process proceeds to step S22. If the determination is negative (not detected), the process proceeds to step S23.
- FIG. 8A shows a case where an affirmative determination is made in step S21, and the second detection signal DS2 generated by the two second detection pulses DP2 in the first half G2a of the second section is the first one. Both peaks indicate that peaks in the table have been detected exceeding Vth (the first and second DS2 shots are indicated by circles).
- step S21 if step S21 is affirmative, the crest of the table has been detected in the first half G2a of the second section, so that the rotation detection circuit 40 has a drive interval TS of the normal pulse SP of about 7.0 mS as an example.
- the frequency selection circuit 4 is instructed by the frequency selection signal P5 to select the frequency to be selected (step S22).
- the output is continued at 0.0 mS, and the step motor 30 can continue the fast-forward operation at a relatively high speed.
- the second detection pulse generating circuit 12 outputs one second detection pulse DP2 for detecting a peak in the table as the second section intermediate G2c (that is, the first detection pulse DP2).
- the second detection determination circuit 42 determines whether or not the crest of the table is detected by the second and third shots (step S23). If the determination is affirmative (two shots are detected), the process proceeds to step S24. If the determination is negative (not detected), the process proceeds to step S25.
- FIG. 8 (b) shows a case where an affirmative determination is made in step S23, and the second detection signal DS2 in the first half of the second section G2a is not detected in the first shot, and the second section intermediate G2c is in the second section. 2 indicates that the second peak of the detection signal DS2 and the total of the second shot of the third shot exceed Vth, and a peak in the table is detected (the first shot of DS2 ⁇ the second and third shots) ⁇ )
- step S23 if step S23 is affirmative, the crest of the table has been detected in the second section intermediate G2c, so that the rotation detection circuit 40 has a drive interval TS of the normal pulse SP of about 7.5 mS as an example.
- the frequency selection circuit 4 is instructed by the frequency selection signal P5 to select the frequency to be selected (step S24).
- step S24 returns to step S1 if an affirmative determination is made in step S2, a negative determination is made in step S21, and an affirmative determination is made in step S23, the process from step S1 to step S24 is continued.
- step S23 if the determination in step S23 is negative, the second detection pulse generation circuit 12 outputs a second detection pulse DP2 that further detects a peak in the second half of the second section G2b (that is, the second detection pulse DP2).
- the second detection determination circuit 42 determines whether or not the crest of the table is detected by the third and fourth shots (step S25). If the determination is affirmative (two shots are detected), the process proceeds to step S26. If the determination is negative (not detected), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- FIG. 8C shows a case where an affirmative determination is made in step S25, and the second detection signal DS2 is not detected in the second half of the second section G2a and not detected in the second half of the second section G2a.
- the 3rd and 4th shots of V2 exceeded Vth, indicating that peaks in the table were detected (DS2 1st and 2nd shots ⁇ 3rd and 4th shots are indicated by ⁇ ) .
- step S25 the rotation detection circuit 40 selects the frequency by the frequency selection signal P5 so as to select the frequency at which the drive interval TS of the normal pulse SP is about 8.5 mS as an example.
- the circuit 4 is instructed (step S26).
- step S26 the process subsequent to step S26 returns to step S1 if an affirmative determination is made in step S2, a negative determination is made in step S21, a negative determination is made in step S23, and an affirmative determination is made in step S25, the process proceeds from step S1 to step S26.
- step S7 if a negative determination is made in step S2 or step S25, it is determined that the rotor 31 has failed to rotate, whereby the detection pulse generation circuit 10 stops generating subsequent detection pulses, The rotation detection circuit 40 activates the correction pulse generation circuit 6 and outputs a correction pulse FP for correcting a rotation error (step S7). Since subsequent steps S7 to S11 are the same as those in the first embodiment, description thereof is omitted here.
- the second detection interval G2 for detecting the peak of the table is divided into a plurality of divided detection intervals.
- FIG. 8B shows an example in which the second detection signal DS2 in the first half G2a of the second interval and the third detection signal DS2 in the second interval intermediate G2c are detected.
- the rotation detection circuit 40 correctly counts the number of detections because adjacent detection intervals are formed across each other ( In this case, it is counted that two shots are detected in the second interval middle G2c), and the drive interval TS of the normal pulse SP can be optimally selected.
- the adjacent detection sections are configured to straddle each other, and the driving interval of the normal pulse SP is set according to the detection result in each detection section. Therefore, even if the detection position of the peak in the table changes slightly, the change Can be reliably detected, and the drive interval TS of the normal pulse SP can be selected with fine and high accuracy.
- the structure illustrated here is comprised over two detection areas, it is not limited to this, For example, you may comprise over three detection areas. Further, the number of divisions of the detection section is not limited.
- the second detection section G2 for detecting a peak in the table is divided into a plurality of parts and extends over other adjacent detection sections.
- the first detection section G1 for detecting the back mountain may be divided into a plurality of parts and may be configured to extend over other adjacent detection sections.
- FIGS. 9 and 10 [Description of Rotation Detection Operation of Second Embodiment: FIGS. 9 and 10]
- rotation detection in the fast-forward operation of the step motor of the second embodiment will be described with reference to the flowchart of FIG. 9 and the timing chart of FIG.
- This second embodiment divides the back peak of the back electromotive force generated from the step motor into two detection sections, and selects the high speed detection mode and the low speed detection mode based on the detection result, thereby changing the rotation state of the rotor. It has features that can be detected quickly and widely.
- the configuration of the electronic timepiece according to the second embodiment is the same as that of the electronic timepiece according to the first embodiment.
- FIG. 10 shows that the drive interval TS of the normal pulse SP is about 5 times.
- FIG. 10B shows the case where the driving interval TS of the normal pulse SP is set to about 6.0 mS.
- the step motor 30 is in a fast-forward operation.
- steps having the same operations as those in the flowchart of the first embodiment described above are denoted by the same reference numerals and detailed description thereof is omitted.
- the normal pulse SP is generated from the normal pulse generating circuit 5 and supplied to the step motor 30 to drive the step motor 30 (step S1).
- the first detection pulse generation circuit 11 outputs four first detection pulses DP1 for detecting the back peak as the first half G1a of the first section, and the first detection determination circuit 41 has the back peak at the first half. It is determined whether or not three first detection signals DS1 are detected during four detection pulses DP1 (step S31). If the determination is affirmative (three shots are detected), the process proceeds to step S32. If the determination is negative (no detection), the process proceeds to step S36.
- the total of the third to fourth shots of the first detection signal DS1 exceeds Vth in the first half G1a of the first section. This indicates that a back mountain has been detected (three DS1s are indicated by a circle).
- step S31 is an affirmative determination, it is assumed that there is momentum in the rotation of the rotor 31, and the process proceeds to detection of a table peak in the high-speed detection mode.
- three second detection pulses DP2 are output from the second detection pulse generation circuit 12 (step S32).
- the second detection determination circuit 42 determines whether or not one or more second detection signals DS2 are detected within three peaks of the second detection pulse DP2 (step S33). Here, if it is affirmation determination (one or more detection was detected), it will progress to step S4, and if it is negative determination (no detection), it will progress to step S34.
- FIG. 10A shows that the third detection signal DS2 is detected as exceeding the second threshold value G2a in the first half of the second period G2a in the decay period T2 (the third generation of DS2 is indicated by ⁇ ). ).
- step S33 if step S33 is affirmative, the rotation detection circuit 40 uses the frequency selection signal P5 to select a frequency at which the drive interval TS of the normal pulse SP is about 5.4 mS, which is the highest speed.
- the selection circuit 4 is instructed (step S4).
- the output is continued at a maximum speed of .4 mS, and the step motor 30 can continue to rotate at the maximum speed.
- the reason why the normal pulse SP is output at the highest speed is that three back peaks are detected in the first half G1a of the first section in step S31, and the top peak is 3 in the second half of the second section G2a in the next step S33. This is because it can be determined that the rotation of the rotor 31 is smooth and vigorous, and the step motor 30 is in a state capable of supporting the highest speed rotation drive.
- step S33 if step S33 is negative, the second detection pulse DP2 is additionally sent from the second detection pulse circuit 12 in order to continue the detection of the peaks in the second half of the second section G2b. Is output (step S34).
- the second detection determination circuit 42 determines whether or not the second detection signal DS2 is detected with respect to the additionally output second detection pulse DP2 as the second half of the second period G2b that continuously detects the peaks in the table. (That is, whether or not the top of the table is detected at the fourth shot) is determined (step S35). If the determination is affirmative (detected), the process proceeds to step S39. If the determination is negative (no detection), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- step S34 only one second detection pulse DP2 is output, but the number is not limited to one, for example, two is output, and one in two in the next step S35. It may be determined whether or not it has been detected. In this case, the detection condition of the peak in the table is relaxed, and the possibility that it is determined that the rotation has failed is reduced, but the rotation detection time is lengthened (the time for one detection pulse is increased).
- step S31 if the determination in step S31 is negative, the first detection pulse generation circuit 11 assumes that there is no momentum in the rotation of the rotor 31 and continues detection of the back mountain in the low speed detection mode.
- four first detection pulses DP1 for detecting the back mountain are added and output as the second half G1b of the first section, and the first detection determination circuit 41 starts the fourth detection of the first detection pulse DP1. It is determined whether or not three first detection signals DS1 are detected during the eighth (step S36). If the determination is affirmative (three shots are detected), the process proceeds to step S37. If the determination is negative (no detection), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- step S36 the subsequent first detection signal DS1 stops outputting and immediately proceeds to step S37 (in the example of FIG. 10B, the seventh detection signal DS1 8th stop).
- step S36 determines whether the determination in step S36 is affirmative. If the determination in step S36 is affirmative, the process proceeds to detection of a peak in the table, and the second detection pulse circuit 12 generates four first detection pulses in order to detect the peak in the table as the second detection section G2. Two detection pulses DP2 are output (step S37).
- the second detection determination circuit 42 determines whether one or more second detection signals DS2 are detected within four peaks of the second detection pulse DP2 (step S38). If the determination is affirmative (one or more shots are detected), the process proceeds to step S39. If the determination is negative (no detection), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- FIG. 10B shows that the fourth detection of the second detection signal DS2 exceeds Vth in the second detection interval G2 in the decay period T2 (the fourth occurrence of DS2 is indicated by ⁇ ). ).
- step S38 if step S38 is affirmative, the rotation detection circuit 40 uses the frequency selection signal P5 to select a frequency at which the drive interval TS of the normal pulse SP is about 6.0 mS, which is slower than the maximum speed.
- the frequency selection circuit 4 is instructed (step S39).
- step S39 the process proceeds to step S9. Further, step S39 is executed even when an affirmative determination is made in step S35 as described above.
- the condition that the drive interval TS of the normal pulse SP is set to about 6.0 mS, which is slower than the maximum speed, is that the back mountain is detected three times in the first half G1a (step S31), and When one peak is detected in the second half G2b (step S35), three backside peaks are detected in the first half G1b (step S36), and the top peak is detected first. This is a case where it is detected within 4 shots of 2 detection sections G2 (step S38).
- the reason for this condition is that even if the back mountain is detected in the first half of the first section G1a (from the first to the fourth shot), the detection of the peak in the next table is slow (detected in the second section of the second half G2b), or This is because if the back mountain is detected in the second half of the first section G1b (from the 4th to the 8th), it can be determined that the rotation of the rotor 31 is somewhat slow for some reason. That is, when the rotation of the rotor 31 is slow and slow, if the normal pulse SP is supplied at the highest speed, a rotation error of the rotor 31 may occur. Therefore, the normal pulse SP is driven according to the rotation state of the rotor 31.
- the interval TS is selected to prevent a rotation error.
- steps S35, S36, S38 if a negative determination is made in steps S35, S36, S38, it is determined that the rotation of the rotor 31 has failed, and steps S7 to S11 are executed. Thereby, the generation of the subsequent detection pulse is stopped, the correction pulse FP is output, the driving period TS of the normal pulse SP is set to about 62.5 mS, and the duty rank of the normal pulse SP is adjusted, Return to step S1. Since this series of processing is the same as the flow (FIG. 4) of the first embodiment, detailed description thereof is omitted.
- the detection position of the back mountain by the back electromotive force generated from the step motor 30 is detected by dividing it into two detection sections, and the high speed detection mode and the low speed detection are performed based on the detection results.
- the mode By selecting the mode, even if the back peak of the current waveform i due to the counter electromotive force changes greatly due to the rotation fluctuation of the rotor 31, the change can be detected quickly and widely, so that an appropriate fast-forwarding operation is realized.
- An electronic watch can be provided.
- the first detection section G1 for detecting the back mountain is detected by dividing it into two detection sections (G1a and G1b) of the first half and the second half, and the rotation state of the rotor 31 is detected from the detection position of the back mountain. If it is predicted quickly and it is assumed that there is momentum in rotation, the high-speed detection mode can be executed to speed up the transition speed to high-speed rotation. Also, if it is assumed that there is no momentum in the rotation of the rotor 31 from the detection position of the back mountain, the low-speed detection mode is entered and a wide detection range of the back mountain and the front mountain is set, so that the rotor 31 Can handle a wide range of rotational fluctuations.
- FIG. 11 a schematic configuration of the electronic timepiece according to the third embodiment will be described with reference to FIG.
- the dummy of the back electromotive force generated from the step motor, the back peak, and the front peak are detected by dividing them into three detection sections. It has a feature that gives priority to high-speed rotation driving, assuming a rotating state. Since the basic configuration of the electronic timepiece of the third embodiment is similar to the configuration of the first embodiment (see FIG. 1), only the added configuration is described here, and the same elements are the same. A number will be omitted and redundant description will be omitted.
- reference numeral 100 denotes an electronic timepiece according to the third embodiment.
- the electronic timepiece 100 includes an oscillation circuit 2, a frequency dividing circuit 3, a frequency selection circuit 4, a normal pulse generation circuit 5, a correction pulse generation circuit 6, a detection pulse generation circuit 10, a pulse selection circuit 7, a driver circuit 20, a step motor 30,
- the rotation detection circuit 40, the power supply voltage detection circuit 50, the frequency count circuit 60, etc. are comprised.
- the detection pulse generation circuit 10 has a third detection pulse generation circuit 13 unique to the third embodiment.
- the third detection pulse generation circuit 13 outputs a third detection pulse DP3 for detecting a dummy generated immediately after the normal pulse SP, with a counter electromotive force generated when the step motor 30 is driven with the normal pulse SP. To do.
- the rotation detection circuit 40 has a third detection determination circuit 43 unique to the third embodiment.
- the third detection determination circuit 43 receives the third detection signal DS3 generated by the third detection pulse DP3 and checks the detection position, and similarly receives the third detection signal DS3 and the third detection signal DS3. And a third detected number counter 43b for checking the number.
- Reference numeral 50 denotes a power supply voltage detection circuit as a factor detection circuit, which detects the voltage of a battery or the like (not shown) serving as the power source of the electronic timepiece 100 and notifies when the voltage falls below a predetermined level.
- the voltage LOW signal P7 is output to the rotation detection circuit 40. The operation of the power supply voltage detection circuit 50 will be described later.
- the frequency count circuit 60 counts the number of times the normal pulse SP having the same duty is output.
- a rank signal that selects the rank of the duty of the normal pulse SP based on the number of outputs counted by the frequency count circuit 60 is supplied to the normal pulse generation circuit 5 together with the drive interval control signal P2 output from the frequency selection circuit 4. .
- FIGS. 12 and 13 show the rotation detection operation in the fast-forward operation of the step motor according to the third embodiment with reference to the flowchart of FIG. 12 and the timing chart of FIG.
- the timing chart of FIG. 13 shows the current waveform i due to the counter electromotive force generated from the step motor 30, and the first, second, and third detection signals DS1, DS2 generated at the input terminals C1, C2 of the step motor 30.
- DS3 is schematically shown as an example.
- FIG. 13A shows an example in which a dummy exists in the current waveform i
- FIG. 13B shows an example in which no dummy exists in the current waveform i. Note that the configuration of the electronic timepiece 100 is described with reference to FIG. In addition, in each step of FIG. 12, steps having the same operations as those in the flowchart of the first embodiment (see FIG. 4) described above are denoted by the same reference numerals and detailed description thereof is omitted.
- the normal pulse SP is generated from the normal pulse generation circuit 5 and supplied to the step motor 30 to drive the step motor 30 (step S1).
- the third detection pulse generation circuit 13 outputs two third detection pulses DP3 for detecting the dummy as the third detection interval G3, and the third detection determination circuit 43 outputs the dummy of the third detection pulse DP3. It is determined whether or not one third detection signal DS3 is detected during two shots (step S41). If the determination is affirmative (a dummy is detected), the process proceeds to step S42. If the determination is negative (no detection), the process proceeds to step S45.
- FIG. 13A shows that the first detection of the third detection signal DS3 exceeds Vth in the third detection period G3 immediately after the end of the drive period T1 and immediately after the start of the decay period T2. (One DS3 is indicated by a circle). If the first detection signal DS3 is detected, the second detection signal DP3 is not output, and the process immediately proceeds to the next step.
- step S41 is an affirmative determination, assuming that the rotation of the rotor is slow and slow, the process proceeds to detection of a back mountain in the low speed detection mode, and the first detection pulse is set as the first detection section G1.
- the circuit 11 outputs four first detection pulses DP1 for detecting the back mountain, and the first detection determination circuit 41 determines whether or not three first detection signals DS1 are detected during the four first detection pulses DP1. Is determined (step S42). If the determination is affirmative (three shots are detected), the process proceeds to step S43. If the determination is negative (no detection), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- FIG. 13A shows that in the first detection period G1, the third to fourth shots of the first detection signal DS1 are detected in excess of Vth during the decay period T2. 3 DS1 shots are indicated by a circle).
- step S42 if the determination in step S42 is affirmative, the process proceeds to detection of a peak in the table, and three second detections are performed to detect the peak in the table from the second detection pulse generation circuit 12 as the second detection section G2.
- the pulse DP2 is output, and the second detection determination circuit 42 determines whether one or more second detection signals DS2 are detected within three of the second detection pulses DP2 (step S43). If the determination is affirmative (detected within 3 shots), the process proceeds to step S44. If the determination is negative (not detected), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- FIG. 13A shows that the second detection signal DS2 is detected in the second detection section G2 to exceed Vth for the third time (the third time of DS2 is indicated by ⁇ ).
- step S43 if the determination in step S43 is affirmative, the rotation detection circuit 40 has a frequency at which the drive interval TS of the normal pulse SP is about 7.5 mS, which is an intermediate speed slower than the maximum speed, for example.
- the frequency selection circuit 4 is instructed by the frequency selection signal P5 (step S44).
- step S44 proceeds to step S9 for adjusting the rank of the normal pulse SP.
- the reason why the drive interval TS of the normal pulse SP is made slower than the maximum speed is that a dummy is detected in the third detection section G3 of step S41.
- the dummy of the current waveform i is, as described above, when the rotor 31 has not finished rotating around 180- ⁇ i degrees (see FIG. 2A) even when the drive pulse SP ends (rotation of the rotor is slow). Appear). Therefore, since the dummy is detected, it is determined that the rotation of the rotor 31 is slow, and accordingly, a drive interval slower than the maximum speed is set.
- step S41 determines whether or not the first detection signal DS1 is detected by the first detection pulse DP1. Is determined (step S45). If the determination is affirmative (detected), the process proceeds to step S46. If the determination is negative (no detection), it is determined that the rotation has failed and the process proceeds to step S7.
- step S45 determines whether or not the first detection signal DS1 is detected by the first detection pulse DP1. Is determined (step S45). If the determination is affirmative (detected), the process proceeds to step S46. If the determination is negative (no detection), it is determined that the rotation has failed and the process proceeds to step S7.
- step S45 determines whether or not the first detection signal DS1 is detected by the first detection pulse DP1. Is determined (step S45). If the determination is affirmative (detected), the process proceeds to step S46. If the determination is negative (no detection), it is determined that the rotation has failed and the process proceeds to step S7.
- step S45 if the determination in step S45 is affirmative, the process proceeds to detection of a peak in the table, and three second detections are performed to detect the peak in the table from the second detection pulse generation circuit 12 as the second detection section G2.
- the pulse DP2 is output, and the second detection determination circuit 42 determines whether one or more second detection signals DS2 are detected within three of the second detection pulses DP2 (step S46). If the determination is affirmative (detected within 3 shots), the process proceeds to step S4. If the determination is negative (not detected), the rotation is determined to be unsuccessful and the process proceeds to step S7.
- FIG. 13B shows that the second detection signal DS2 is detected in the second detection section G2 to exceed Vth for the second time (the second time of DS2 is indicated by a circle).
- step S46 the rotation detection circuit 40 selects the frequency at which the drive interval TS of the normal pulse SP is about 5.4 mS, which is the highest speed, as an example.
- the reason why the drive interval TS of the normal pulse SP is set to the highest speed is that no dummy is detected in the third detection section G3 of step S41. That is, as described above, the dummy of the current waveform i does not appear when the rotor 31 is less than 180- ⁇ i degrees (when the rotation of the rotor is fast) during the output of the drive pulse SP. Therefore, since no dummy was detected, it was determined that the rotation of the rotor 31 was fast, thereby setting the fastest drive interval.
- steps S42, S43, S45, and S46 if a negative determination is made in steps S42, S43, S45, and S46, it is determined that the rotation of the rotor 31 has failed, and steps S7 to S11 are executed. As a result, generation of the subsequent detection pulses is stopped, the correction pulse FP is output, the driving period TS of the normal pulse SP is set to about 62.5 mS, the duty rank of the normal pulse SP is adjusted, and step S1 Return to. Since this series of processing is the same as the flow (FIG. 4) of the first embodiment, detailed description thereof is omitted.
- the third embodiment after the output of the normal pulse SP, the three phenomena of the dummy, the back peak, and the front peak due to the counter electromotive force generated from the step motor 30 are sequentially detected. As a result, the rotational state of the rotor 31 can be accurately grasped, and an electronic timepiece that can detect the rotational state of the step motor 30 with high accuracy can be provided. Also, the presence or absence of a dummy immediately after the output of the normal pulse SP is determined. If no dummy is detected, it is assumed that there is momentum in the rotation of the rotor 31 and the rotation is fast.
- the present embodiment is a drive unit that prioritizes driving the step motor 30 at the highest possible speed.
- the modification of the third embodiment is configured to detect the back electromotive force dummy generated from the step motor, the back peak, and the front peak in three detection sections, and depending on the presence or absence of the dummy.
- a feature is that the rotation state of the rotor is predicted and the rank of the normal pulse SP is lowered to give priority to the low power consumption driving.
- the configuration of the electronic timepiece 100 is referred to FIG. 11, and the timing chart is the same as the timing chart of the third embodiment (see FIG. 13). Further, in each step of FIG. 14, steps having the same operations as those in the flowchart of the first embodiment (see FIG. 4) described above are denoted by the same reference numerals and detailed description thereof is omitted.
- step S1, step S41, step S42, step S43, step S44, step S45, step S46, and step S4 are the same processing as the flow of the third embodiment described above (FIG. 12). Is omitted.
- step S51 determines whether the duty rank of the normal pulse SP is minimum.
- it is affirmation determination it is a minimum rank
- the present rank namely, minimum rank
- step S52 If step S51 is negative, rank down is performed in order to give priority to low power consumption driving (step S53).
- the step motor 30 continues to rotate at a medium speed slower than the maximum speed, and the rank (ie, duty) of the normal pulse SP shifts to the minimum rank in order to prioritize the low power consumption drive. Is processed as follows.
- step S55 Whether or not the number of outputs of the normal pulse SP of the same duty counted by the frequency count circuit 60 has reached 256 after execution of step S4 in which the drive interval TS of the normal pulse SP is set to the maximum speed of about 5.4 mS. It is determined whether or not (step S55). Here, if the determination is affirmative (same for 256 times or more), in order to prioritize low power consumption driving, the rank is lowered and the process returns to step S1 (step S54). If a negative determination is made in step S55, the process returns to step S1 without changing the rank. In addition, it may replace with above-mentioned step S53 and may perform the same process as step S55 and S54.
- the basic operation of the modified example of the third embodiment is the same as the flow of the third embodiment described above (see FIG. 12), but the rotor 31 rotates at the highest speed (about 5. 4mS) and in the middle rotation state (about 7.5mS), the duty of the normal pulse SP is shifted as small as possible.
- the present embodiment is a drive unit that prioritizes driving the stepping motor 30 as fast as possible with as low power consumption as possible.
- step S41 the dummy determination (step S41) becomes an affirmative determination, and the selection of the drive interval TS shifts to about 7.5 mS.
- the modification of the third embodiment includes not only low power consumption drive by rank reduction of the normal pulse SP but also control of low power consumption drive by delaying the drive interval TS of the normal pulse SP. As described above, the modification of the third embodiment can realize low power consumption driving by changing the driving conditions of both the duty of the normal pulse SP and the driving interval TS.
- FIG. 15 An operation example in which the two drive means of the third embodiment (rotational speed priority drive) and the modified example of the third embodiment (low power consumption priority drive) are switched by detecting a specific factor is shown in FIG. This will be described with reference to a flowchart. Here, detection of the battery voltage that is the power source of the electronic timepiece 100 will be described as an example of the factor detection. For the configuration, refer to the configuration diagram (FIG. 11) of the electronic timepiece 100 of the third embodiment.
- the power supply voltage detection circuit 50 detects the battery voltage of the electronic timepiece 100 at a predetermined cycle and rotates the detection result as the voltage LOW signal P7. It inputs into the detection circuit 40 (step S61).
- the rotation detection circuit 40 determines whether the power supply voltage is equal to or lower than a predetermined voltage based on the voltage LOW signal P7 (step S62). Here, if the determination is affirmative (below a predetermined voltage), it is determined that the capacity of the battery is decreasing, and in order to reduce power consumption, low power consumption priority driving (that is, a modification of the third embodiment) (Step S63). If the determination is negative (greater than or equal to a predetermined voltage), it is determined that the battery capacity is sufficient and priority is given to high-speed rotation, so that rotation speed priority driving (ie, operation flow of the third embodiment: FIG. 12) (step S64).
- the rotation detection circuit 40 instructs the frequency selection circuit 4 to specify the frequency, and also instructs the normal pulse generation circuit 5 to specify the duty.
- An electronic watch that can be realized can be provided.
- the factor detection is not limited to the battery voltage.
- a temperature measurement unit that measures the ambient temperature may be provided, and the driving condition of the step motor 30 may be switched according to the temperature change.
- FIGS. 16 and 17 [Description of Rotation Detection Operation of Another Modification of Third Embodiment: FIGS. 16 and 17]
- rotation detection in the fast-forward operation of the step motor according to another modification of the third embodiment will be described with reference to the flowchart of FIG. 16 and the timing chart of FIG.
- Another modification of the third embodiment is characterized in that the presence or absence of a dummy is predicted based on the presence or absence of detection of the head of the back peak of the back electromotive force generated from the step motor, and the rotational state of the rotor is grasped. I have.
- the timing chart of FIG. 17 shows an example of the current waveform i due to the counter electromotive force generated from the step motor 30 and the first and second detection signals DS1 and DS2 generated at the input terminals C1 and C2 of the step motor 30.
- FIG. 17A of the timing chart shows an example in which the top of the back mountain cannot be detected (that is, it is predicted that there is a dummy)
- FIG. 17B shows an example in which the top of the back mountain can be detected ( That is, it is predicted that there is no dummy).
- the normal pulse SP is generated from the normal pulse generation circuit 5 and supplied to the step motor 30 to drive the step motor 30 (step S1).
- the first detection pulse DP1 is output from the first detection pulse circuit 11 as the first half G1a of the first section, and the first detection determination circuit 41 outputs the first detection signal. It is determined whether or not the first shot of DS1 has been detected (step S71). Here, if the determination is negative (no detection), it is assumed that there is a dummy (that is, the rotation is slow), and the process proceeds to step S72. If the determination is affirmative (detected), it is assumed that there is no dummy ( In other words, the process proceeds to step S73 where the rotation is fast).
- FIG. 17A shows that in the first half of the first section G1a immediately after the start of the decay period T2, the first first detection signal DS1 does not exceed Vth (the first one of DS1). X).
- step S71 in FIG. 16 when negative determination is made in step S71 in FIG. 16, it is assumed that there is a dummy and the rotation of the rotor 31 is slow and slow, and the subsequent detection is set to the low speed detection mode. That is, in order to surely detect the back mountain, the first detection pulse circuit 11 outputs four first detection pulses DP1 as the second half G1b of the first section, and the first detection determination circuit 41 Determines whether or not three first detection signals DS1 are detected during four first detection pulses DP1 (step S72).
- FIG. 17A shows that in the decay period T2, in the first half of the first section G1b, 3 shots were detected exceeding Vth during 4 shots of the first detection signal DS1 (4 shots of DS1). 3 of them are indicated by ⁇ ).
- step S71 If step S71 is affirmative, it is assumed that there is no dummy and the rotor 31 is vibrant and fast, and the subsequent detection is set to the high-speed detection mode. That is, in order to confirm the back mountain in a short period, the first detection pulse circuit 11 outputs three first detection pulses DP1 as the first second half G1b, and the first detection determination circuit 41 It is determined whether or not one first detection signal DS1 is detected during the three first detection pulses DP1 (step S73).
- step S46 if the determination is affirmative (one shot is detected), the process proceeds to step S46, and if the determination is negative (no detection), it is determined that the rotation has failed and the process proceeds to step S7.
- the first detection signal DS1 starts at the first half in the first half G1a, and the first detection signal DS1 further increases by 1 in the next first half G1b. Both of the shots are detected exceeding Vth (two DS1 shots are indicated by ⁇ ).
- step S73 if the first detection signal DS1 is detected in the second half G1b of the first period, the subsequent output of the first detection pulse DP1 is stopped, and the process immediately proceeds to the next step S46.
- step S73 is affirmation determination, since the process after the next step S46 is the same as that of the flow (refer FIG. 12) of 3rd Embodiment, description is abbreviate
- the drive interval TS of the normal pulse SP about 5.4 mS is set, and the normal pulse SP is output at the highest speed. This is a setting of a result of assuming that there is no dummy because the top of the back mountain can be detected and that the rotation of the rotor 31 is determined to be fast in the subsequent detection.
- steps S72, S43, S73, and S46 it is determined that the rotation of the rotor 31 has failed, and steps S7 to S11 are executed.
- generation of the subsequent detection pulses is stopped, the correction pulse FP is output, the driving period TS of the normal pulse SP is set to about 62.5 mS, the duty rank of the normal pulse SP is adjusted, and step S1 Return to. Since this series of processing is the same as the flow (FIG. 12) of the third embodiment, detailed description thereof is omitted.
- the presence / absence of a dummy is assumed based on the presence / absence of detection of the top of the back mountain (that is, presence / absence of detection in the first half of the first section G1a).
- this embodiment is suitable for an electronic timepiece having a step motor capable of high-speed rotation.
- the configuration of the electronic timepiece 100 since it is not necessary to detect a dummy, the configuration of the electronic timepiece 100 (see FIG. 11) does not require the third detection pulse generation circuit 13 and the third detection determination circuit 43, and the circuit configuration of the electronic timepiece There is an advantage that can be simplified.
- FIGS. 18 and 19 [Description of Rotation Detection Operation of Fourth Embodiment: FIGS. 18 and 19] Next, rotation detection in the fast-forward operation of the step motor of the fourth embodiment will be described with reference to the flowchart of FIG. 18 and the timing chart of FIG.
- the fourth embodiment is characterized in that the driving interval TS of the normal pulse SP is determined according to the detection end position of the back peak of the counter electromotive force generated from the step motor.
- the configuration of the electronic timepiece according to the fourth embodiment is the same as that of the electronic timepiece according to the first embodiment. Further, as a premise for explanation, it is assumed that the step motor 30 is in a fast-forward operation. In addition, in each step of FIG. 18, steps having the same operations as those in the flowchart of the first embodiment (see FIG. 4) described above are denoted by the same reference numerals and detailed description thereof is omitted.
- the normal pulse SP is generated from the normal pulse generation circuit 5 and supplied to the step motor 30 to drive the step motor 30 (step S1).
- the first detection pulse generation circuit 11 outputs six first detection pulses DP1 as the first detection interval G1, and the first detection determination circuit 41 outputs the first detection pulse DP1.
- step S81 it is determined whether or not two first detection signals DS1 are detected in the first two. If the determination is affirmative (the first two shots have been detected), the process proceeds to step S82. If the determination is negative (no detection), the rotor 31 is determined to have failed to proceed to step S7.
- step S81 If the determination in step S81 is negative, there is a possibility that the rotor 31 does not vigorously rotate and a dummy appears (see FIG. 13A). A transition to the detection mode may be performed to perform dummy detection, reverse peak detection, and front peak detection, and processing corresponding to the slow rotation of the rotor 31 may be added.
- step S81 determines whether or not the first detection signal DS1 is detected at the third peak of the first detection pulse DP1 in the back mountain (step S81). S82). If the determination is negative (no detection), output of the first detection pulse DP1 from the fourth is stopped and the process proceeds to step S83. If the determination is affirmative (detected), the process proceeds to step S85.
- step S82 determines whether or not the second detection signal DS2 is detected twice by the second detection pulse DP2 (step). S83). If the determination is affirmative (detected), the process proceeds to step S84. If the determination is negative (no detection), it is determined that the rotation of the rotor 31 has failed and the process proceeds to step S7.
- step S83 determines whether the determination in step S83 is affirmative.
- step S85 is a negative determination and step S86 is an affirmative determination
- step S86 is an affirmative determination
- step S88 is negative and step S89 is positive
- step S91 is negative and step S92 is affirmative
- step S7 when a negative determination is made in steps S86, S89, and S92, or when an affirmative determination is made in step S91, it is determined that the rotation of the rotor 31 has failed and the process proceeds to step S7. Since the processing after step S7 is the same as the flow of the first embodiment (see FIG. 4), description thereof is omitted.
- FIG. 19 schematically shows an example of the current waveform i due to the counter electromotive force generated from the step motor 30 and the first and second detection signals DS1 and DS2 generated at the input terminals C1 and C2 of the step motor 30.
- FIG. 19 is divided into FIG. 19-1 with FIGS. 19 (a) and 19 (b) and FIG. 19-2 with FIGS. 19 (c), 19 (d), and 19 (e).
- step S81 an affirmative determination is made in step S81
- a negative determination is made in step S82
- an affirmative determination is made in step S83
- the drive interval TS of the normal pulse SP is set to about 7.0 mS as an example.
- the drive interval TS of the normal pulse SP is set to about 7.0 mS as an example.
- the timing at which the first detection signal DS1 is no longer detected is the third detection signal DS1, and the top peak can be detected.
- 31 is determined to be relatively fast, and the driving interval TS of the normal pulse SP is set to about 7.0 mS.
- step S81 and step S82 an affirmative determination is made in step S81 and step S82, a negative determination is made in step S85, and an affirmative determination is made in step S86, and the driving interval TS of the normal pulse SP is about 7.5 mS as an example.
- the driving interval TS of the normal pulse SP is about 7.5 mS as an example. This is the case. That is, after the end of the driving period T1, the first two detections of the first detection signal DS1 are detected in the first detection period G1 after the start of the decay period T2, and then the third detection of the first detection signal DS1 is detected.
- the back peak detection end position Z is the fourth detection signal DS1 and the front peak can be detected. Therefore, it is determined that the rotation of the rotor 31 is moderate,
- the drive interval TS of the pulse SP is set to about 7.5 mS.
- step S81 an affirmative determination is made in step S81, step S82, and step S85, a negative determination is made in step S88, and an affirmative determination is made in step S89, and the drive interval TS of the normal pulse SP is about 8 as an example.
- the fifth shot is not detected, indicating that two shots of the second detection signal DS2 in the next second detection section G2 have been detected (the first four shots of DS1 are marked as ⁇ 5 Is indicated by ⁇ , and two DS2 shots are indicated by ⁇ .
- the back peak detection end position Z is the fifth detection signal DS1, and the front peak has been detected. Therefore, it is determined that the rotation of the rotor 31 is slightly slow, and the normal pulse SP Is set to about 8.5 mS.
- step S81 an affirmative determination is made in step S81, step S82, step S85, and step S88, a negative determination is made in step S91, and an affirmative determination is made in step S92, and the drive interval TS of the normal pulse SP is an example. Is set to about 9.5 mS. That is, after the driving period T1 ends, the first two detections of the first detection signal DS1 are detected in the first detection period G1 after the start of the decay period T2, and then the first detection signal DS1 3, 4, 5 is detected. The first shot is detected, the sixth shot is not detected, and two shots of the second detection signal DS2 in the next second detection section G2 are detected (the first five shots of DS1 are indicated by ⁇ , 6). X), and 2 DS2 shots are indicated by ⁇ ).
- the back peak detection end position Z is the sixth detection signal DS1, and since the front peak was detected, it is determined that the rotor 31 has rotated but the rotation is slow.
- the driving interval TS of the pulse SP is set to about 9.0 mS.
- the timing chart of FIG. 19 (e) is an example of a case where it is determined that the rotation of the rotor 31 has failed, and is a case where an affirmative determination is made in step S91. That is, after the driving period T1, the first two detections of the first detection signal DS1 are detected in the first detection period G1 immediately after the start of the attenuation period T2, and thereafter, the first detection signal DS1, 3, 4, 5 , All six shots have been detected (all six DS1 shots are marked with a circle).
- the first detection signal DS1 is detected up to the sixth shot, and the detection end position Z of the back mountain cannot be detected, so it is determined that the rotor 31 has failed to rotate.
- the six first detection pulses DP1 are collectively output as the first detection interval G1 in step S81, but the process of separating the detection intervals and sequentially outputting the first detection pulse DP1 is performed. May be. That is, although not shown, the first detection interval G1 is divided into the first interval G1a to the first interval G1e, and the first first detection pulse DP1 is output in the first interval G1a for determination, and a positive determination is made. For example, in step S82, the third detection pulse DP1 is output as the first interval G1b for determination. If the determination is affirmative, the fourth detection detection signal DP1 is output as the first interval G1c in step S85. Processing such as determination may be performed. In this case, the internal processing of the rotation detection circuit 40 is different, but the operation is the same as the timing chart shown in FIG.
- the rotation detection circuit 40 notifies the second detection pulse generation circuit 12 of a negative determination in the detection determination of the first detection signal DS1, and the second detection pulse
- the generation circuit 12 generates the second detection pulse DP2 at a timing after the negative determination of the first detection signal DS1. That is, as shown in FIG. 19, the first detection pulse DP1 and the second detection pulse DP2 are independent, and the second detection pulse generation circuit 12 performs the second detection after the negative determination of detection by the first detection signal DS1.
- the detection pulse DP2 is generated, the present invention is not limited to this.
- both the first detection pulse DP1 and the second detection pulse DP2 open the output terminals O1 and O2 of the driver circuit 20, the detection of the first detection signal DS2 is negative.
- One detection pulse DP1 may also serve as the first pulse of the second detection pulse DP2. With such a configuration, it is possible to detect the second detection signal DS2 from the negative detection timing of the first detection signal DS1, and thus it is possible to eliminate time loss.
- the detection end position Z of the back mountain is detected by the first detection pulse DP1 in the first detection section G1 for detecting the back mountain, and the detection end position Z Accordingly, since the driving interval TS of the normal pulse SP is determined, the driving interval TS can be determined quickly after the back hill is finished, and it is possible to cope with the speeding up of the rotation detection. As a result, even when the step motor 30 rotates at high speed, rotation detection can be performed without delay in the rotation state, so that highly accurate rotation detection at high speed rotation is possible.
- the rotation detection operation described in the fourth embodiment can be applied not only during fast-forwarding operation, but also during other hand movements, for example, during normal hand movement operation.
- the rotation detection operation in this application example will be described using the flowchart of FIG. 20 and the timing chart of FIG.
- the second detection pulse DP2 in the second detection interval is output. It has become.
- the driving interval of the normal pulse SP in this case is equal to the operating interval during the normal operating operation, and is not varied according to the detection result.
- the configuration of the electronic timepiece of this application example is the same as that of the electronic timepiece of the fourth embodiment, and in the steps in the flowchart shown in FIG. 20, the flowchart of the first embodiment described above (FIG. Steps in the same operation as in 4) are denoted by the same reference numerals, and the configuration of the timing chart shown in FIG. 21 is the same as that in the timing chart (FIGS. 5 and 6) of the first embodiment described above. Is also the same as in the fourth embodiment.
- the normal pulse SP is generated from the normal pulse generating circuit 5, supplied to the step motor 30, and the step motor 30 is driven (step S1).
- the first detection pulse generation circuit 11 outputs the first detection pulse DP1 a predetermined number of times, for example, six times as an upper limit as the first detection section G1.
- the first detection determination circuit 41 determines whether or not two first detection signals DS1 have been detected (step S111). Here, if a negative determination (no detection) is made, it is determined that the rotation of the rotor 31 has failed, and the process proceeds to step S7.
- step S111 If the determination in step S111 is affirmative, the first detection pulse generation circuit 11 continues to output the first detection pulse SP1 and the first detection determination circuit 41 if the number of outputs of the first detection pulse SP1 has not reached the upper limit. Determines whether or not the detection determination of the first detection signal DS1 is determined to be negative (no detection) (step S112). And if it is affirmation determination by step S112, the 1st detection area G1 will be complete
- Step 113 Whether the output of the first detection pulse is stopped (step 113) or the detection determination of the first detection signal DS1 is not determined as a negative determination (no detection), and the upper limit of the number of occurrences of the first detection pulse is reached (Step 112: N), the rotation detection circuit 40 notifies the second detection pulse generation circuit 12 in order to shift to the detection of the peaks in the table, and the second detection pulse generation circuit 12 generates two detection pulses as the second detection interval G2.
- the second detection pulse DP2 is output.
- the second detection determination circuit 42 detects whether or not the second detection signal DS2 is detected twice by the second detection pulse DP2 (step S114).
- step S115 it is determined that the rotation of the rotor 31 is successful. If the determination is negative (no detection), it is determined that the rotation of the rotor 31 is unsuccessful, and the process proceeds to step S7. move on.
- step S115 Since the processing after step S7 is the same as the flow of the first embodiment (see FIG. 4), description thereof is omitted.
- the processing in the case of a successful rotation determination (step S115) is omitted because it is not directly related to the description of the present invention, but is usually performed when an appropriate processing, for example, a successful rotation determination at the same duty is made a predetermined number of times. For example, the duty rank of the pulse SP may be lowered. In any case, the processing is returned to step S1 at the hand movement interval during the normal hand movement operation, and the normal pulse SP is output.
- the detection of the two first detection signals DS1 is successful, an affirmative determination is made in step S111, the detection of the first detection signal DS1 fails, and an affirmative determination is made in step S112.
- the second detection signal DS2 is detected twice and an affirmative determination is made in step S114 to determine that the rotation is successful.
- the first one of the first detection signal DS1 is detected in the first detection period G1 after the end of the driving period T1 and after the start of the decay period T2.
- the following three shots are detected, the fifth shot is not detected, and it is shown that two shots of the second detection signal DS2 in the next second detection section have been detected (the first and last of DS1 are indicated by ⁇ ).
- the three shots in between are indicated by ⁇ , and the two DS2 shots are indicated by ⁇ .
- the first detection signal DS1 is not detected for the first detection pulse DP1
- the second detection signal DS1 is detected for the second and third detections, and thus in step S111.
- a positive determination is made.
- the first detection interval G1 is continued and the first detection pulse DP1 is further output.
- the fourth first detection signal DS1 is detected
- the fifth first detection pulse DP1 is output. Since the fifth first detection signal DS1 has not been detected, this position becomes the detection end position Z, the first detection section G1 ends at the detection end position Z, and the output of the first detection pulse DP1 is stopped. (Steps S112 and S113).
- two second detection signals DS2 are detected by two second detection pulses DP2, and it is determined that the rotation of the rotor 31 is successful (steps S114 and S115).
- the basic configuration of the electronic timepiece according to the fifth embodiment is the same as the configuration according to the third embodiment (see FIG. 11), and thus the description thereof is omitted.
- the power supply voltage detection circuit 50 detects the power supply voltage of the electronic timepiece (step S101). Then, the rank of the normal pulse SP corresponding to the detected power supply voltage is selected (step S102). In this way, by first detecting the power supply voltage of the electronic timepiece and selecting the optimum rank, the stepping motor 30 can be driven with minimum power consumption while increasing the handing speed immediately after the start of handing.
- the normal pulse SP is output by the normal pulse generation circuit 5 (step S1), and the step motor 30 is driven.
- one third detection signal DS is detected during two third detection pulses DP3 (step S41), and three first detection signals DS are detected during four first detection signals DS1 (step S42). )
- step S103 it is determined whether or not the number of outputs of the normal pulse SP with the same duty counted by the frequency count circuit 60 has reached 256 (step S103). If step 103 is negative, that is, if the number of times of output of the normal pulse SP with the same duty has not reached 256, the processing from step S1 to step S103 is continued without changing the rank of the normal pulse SP. .
- low power saving is prioritized and the battery voltage has the capacity to drive fast-forward at the highest speed, but the medium rotation state (about Once set to 7.5 mS), it was not possible to shift to the highest speed rotation state (about 5.4 mS), whereas in the fifth embodiment, normal pulse output with the same duty is performed.
- the number of times reaches a predetermined number, it is possible to shift to the highest speed rotation state (about 5.4 mS) by raising the rank. Therefore, it is possible to increase the speed of fast-forwarding.
- step S55 of FIG. 22 it is determined whether or not the number of outputs of the normal pulse SP of the same duty counted by the frequency count circuit 60 has reached 256 times. If the determination in step S55 is negative, that is, if the number of times of output of the normal pulse SP with the same duty has not reached 256, the process returns to step S1, and the processing from step S1 to step S55 is performed without changing the rank of the normal pulse SP. Will continue.
- step S55 determines whether or not the rank of the normal pulse SP is minimum (Ste S107). If this step S107 is negative, that is, if there is room to lower the rank, the rank is lowered. In this way, when the rank is not minimum, power consumption can be suppressed by lowering the rank to the minimum duty that can maintain the maximum speed.
- the electronic timepiece of the fifth embodiment is designed to optimize the balance between the speeding up of the step motor 30 and the reduction in power consumption.
- the fifth embodiment is particularly suitable for application to a solar timepiece in which the power supply voltage varies greatly.
- the configuration diagrams, flowcharts, timing charts, and the like shown in the embodiments of the present invention are not limited thereto, and can be arbitrarily changed as long as they satisfy the gist of the present invention.
- the number of detection pulse outputs, the detection period, and the number of detections in each detection section are not limited, and can be arbitrarily changed according to the performance of the step motor and the specifications of the electronic timepiece.
- the detection signal count in each detection section described in each embodiment is determined by counting the total number of detection signals. In other words, whether or not the detection pulses are continuously detected or skipped within each detection section, an affirmative determination is made if the predetermined number of detections (total number) has been reached. For example, in the second embodiment, in the first half G1a of the first section shown in FIG. 10 (a), the first detection signal DS1 is detected three times continuously from the second time, but this is limited to this continuous detection. For example, an affirmative determination is made even if a total of three shots of the first, third, and fourth shots are detected.
- the detection pulse at any position in the section may be detected.
- the second detection signal DS2 of the third shot is detected and affirmatively determined in the first half G2a of the second section shown in FIG. 10A, but the present invention is not limited to this.
- the first detection signal or the second detection signal DS2 may be used.
- the present invention is not limited to the fast-forward operation of the step motor, and can be applied to, for example, detection of the rotation of the rotor in a normal hand movement operation every second.
- 1,100 electronic timepiece 2 oscillation circuit, 3 frequency divider circuit, 4 frequency selection circuit, 5 normal pulse generation circuit, 6 correction pulse generation circuit, 7 pulse selection circuit, 10 detection pulse generation circuit, 11 first detection pulse generation circuit , 12 2nd detection pulse generation circuit, 13 3rd detection pulse generation circuit, 20 driver circuit, 30 step motor, 31 rotor, 32 stator, 33 coil, 40 rotation detection circuit, 41 1st detection determination circuit, 42 2nd detection Determination circuit, 43 third detection determination circuit, 50 power supply voltage detection circuit, 60 frequency count circuit, SP normal pulse, FP correction pulse, DP1 first detection pulse, DP2 second detection pulse, DP3 third detection pulse, DS1 first Detection signal, DS2 second detection signal, DS3 third detection signal.
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Abstract
Description
第1の実施形態の特徴は本発明の基本的な構成例であり、ステップモータから発生する逆起電力の裏の山と表の山とを複数の検出区間に分けて検出し、ロータの回転速度を決定することである。第2の実施形態の特徴はステップモータから発生する逆起電力の裏の山を二つの検出区間に分けて検出することで、ロータの回転状態を素早く、且つ、幅広く把握することである。第3の実施形態の特徴はステップモータから発生する逆起電力のダミーの表の山と裏の山と表の山とを三つの検出区間に分けて高精度に検出することである。第4の実施形態の特徴はステップモータから発生する逆起電力の裏の山の検出終了位置に応じてロータの回転速度を素早く決定することである。
第1の実施形態の電子時計の概略構成を図1を用いて説明する。この第1の実施形態の電子時計は、ステップモータから発生する逆起電力の裏の山と表の山とを複数の検出区間に分けて高精度に検出する特徴を備えている。
次に、ステップモータ30の構成と基本動作を図2を用いて説明する。図2(a)において、ステップモータ30は、ロータ31、ステータ32、コイル33などによって構成される。ロータ31は2極磁化された円盤状の回転体であり、径方向にN極、S極に着磁されている。ステータ32は、軟磁性材により成り、ロータ31を囲む半円部32a、32bがスリットで分割されている。また、半円部32a、32bが結合している基部32eに単相のコイル33が巻装されている。単相とはコイルが1個であり、駆動パルスDPを入力する入力端子C1、C2が2個であることを意味している。
次に図3のタイミングチャートを用いて、前述した図2(b)の正常回転した場合の電流波形i1を例として、本発明がどのようにロータ31の回転状態を検出するかの基本動作を説明する。図3において、通常パルスSPがステップモータ30に供給されると、ロータ31が矢印Cのように180度回転して、その後、減衰振動する(図2(a)参照)。この通常パルスSP終了後の減衰期間T2における電流波形i1を詳細に説明すると、駆動期間T1の終了後、ロータ31の減衰振動によって、通常パルスSPと反対側(GNDに対してプラス側)に誘起電流が流れ、この電流の山形状を「裏の山」と称する。
次に、第1の実施形態のステップモータの早送り動作での回転検出を図4のフローチャートと図5、図6のタイミングチャートを用いて説明する。ここで、図5、図6のタイミングチャートは、ステップモータ30から発生する逆起電力による電流波形iと、ステップモータ30の入力端子C1、C2に供給される通常パルスSPと、入力端子C1、C2に発生する第1、第2検出信号DS1、DS2の一例を模式的に示している。
次に、第1の実施形態の変形例のステップモータの早送り動作における回転検出を図7のフローチャートと図8のタイミングチャートを用いて説明する。この第1の実施形態の変形例の電子時計は、ステップモータから発生する逆起電力の裏の山と表の山とを複数の検出区間で検出し、且つ、表の山を検出する検出区間を複数に分割し、分割された検出区間が隣接する他の検出区間にまたがって構成されることで、ロータの回転状態をきめ細かく検出できる特徴を備えている。なお、図8は便宜上、図8(a)(b)を掲載した図8-1と、図8(c)を掲載した図8-2に分けている。
次に、第2の実施形態のステップモータの早送り動作における回転検出を図9のフローチャートと図10のタイミングチャートを用いて説明する。この第2の実施形態は、ステップモータから発生する逆起電力の裏の山を二つの検出区間に分け、その検出結果で高速検出モードと低速検出モードを選択することで、ロータの回転状態を素早く、且つ、幅広く検出できる特徴を備えている。なお、第2の実施形態の電子時計の構成は、第1の実施形態の電子時計と同様であるので、構成は図1を参照する。
次に、第3の実施形態の電子時計の概略構成を図11を用いて説明する。この第3の実施形態は、ステップモータから発生する逆起電力のダミーと裏の山と表の山とを三つの検出区間に分けて検出する構成であり、且つ、ダミーの有無によって、ロータの回転状態を想定し、高速回転駆動を優先する特徴を備えている。なお、第3の実施形態の電子時計の基本構成は、第1の実施形態の構成(図1参照)に近似しているので、ここでは追加された構成のみを説明し、同一要素には同一番号を付して重複する説明は省略する。
次に、第3の実施形態のステップモータの早送り動作における回転検出動作を図12のフローチャートと図13のタイミングチャートを用いて説明する。ここで、図13のタイミングチャートは、ステップモータ30から発生する逆起電力による電流波形iと、ステップモータ30の入力端子C1、C2に発生する第1、第2、第3検出信号DS1、DS2、DS3の一例を模式的に示している。
次に、第3の実施形態の変形例のステップモータの早送り動作における回転検出を図14のフローチャートを用いて説明する。この第3の実施形態の変形例は、ステップモータから発生する逆起電力のダミーと裏の山と表の山とを三つの検出区間に分けて検出する構成であり、且つ、ダミーの有無によってロータの回転状態を予測すると共に、通常パルスSPのランクを下げて低消電駆動を優先する特徴を備えている。
次に、前述した第3の実施形態(回転速度優先駆動)と第3の実施形態の変形例(低消電優先駆動)の二つの駆動手段を特定の要因検出によって切り替える動作例を図15のフローチャートを用いて説明する。ここで、要因検出としては電子時計100の電源である電池電圧検出を例として説明する。なお、構成は第3の実施形態の電子時計100の構成図(図11)を参照する。
次に、第3の実施形態の他の変形例のステップモータの早送り動作における回転検出を図16のフローチャートと図17のタイミングチャートを用いて説明する。この第3の実施形態の他の変形例は、ステップモータから発生する逆起電力の裏の山の先頭の検出の有無でダミーの出現の有無を予測してロータの回転状態を把握する特徴を備えている。
次に、第4の実施形態のステップモータの早送り動作における回転検出の説明を図18のフローチャートと図19のタイミングチャートを用いて説明する。この第4の実施形態は、ステップモータから発生する逆起電力の裏の山の検出終了位置に応じて通常パルスSPの駆動間隔TSを決定する特徴を備えている。
次に、第5の実施形態のステップモータの早送り動作における回転検出動作を図22のフローチャートを用いて説明する。第5の実施形態の電子時計は、以下で詳述するが、通常パルスSPの出力回数に応じてデューティのランクを調整可能に構成したことを特徴とするものである。なお、図22のフローチャートは、第3の実施形態の変形例に係る電子時計の回転検出動作の説明に用いたフローチャート(図14参照)に近似しているので、同フローに対し追加され、又は変更されたステップについてのみ新規に説明し、同一のステップについては同一の符号を付し、その詳細な説明は重複するため省略する。なお、第5の実施形態の電子時計の基本構成は、第3の実施形態の構成(図11参照)と同様であるため、その説明は省略する。
Claims (15)
- ステップモータと、
該ステップモータを駆動するための通常パルスを出力する通常パルス発生回路と、
前記通常パルスで前記ステップモータを駆動後、前記ステップモータが回転したか否かを検出する検出パルスを出力する検出パルス発生回路と、
前記通常パルスと前記検出パルスを選択出力するパルス選択回路と、
該パルス選択回路から出力されたパルスを前記ステップモータに負荷するドライバ回路と、
前記検出パルスにより発生する検出信号を入力し、前記ステップモータが回転したか否かを判定する回転検出回路と、
前記通常パルスの駆動間隔を決定する周波数選択回路と、
を有し、
前記検出パルス発生回路は、前記検出パルスを所定の区間に分けて出力し、
前記回転検出回路は、前記所定区間に対応した検出区間に分けて検出を行い、記検出信号が検出された区間に対応した周波数を選択するように、前記周波数選択回路に指示する
ことを特徴とする電子時計。 - 前記回転検出回路は、複数の前記検出区間に分けて検出を行い、一の検出区間における検出結果に応じて、他の検出区間における検出条件を変更する
ことを特徴とする請求項1に記載の電子時計。 - 前記検出区間における検出条件には、少なくとも、前記検出区間の区間幅及び、前記検出区間中に検出されるべき前記検出信号の個数の少なくともいずれかが含まれる
ことを特徴とする請求項2に記載の電子時計。 - 前記通常パルス発生回路は、駆動力の異なる複数の前記通常パルスを出力可能に構成され、
前記回転検出回路は、前記ステップモータが回転したか否かの判定結果に基づき、前記通常パルスの前記駆動力を選択し、前記通常パルス発生回路に指示する
ことを特徴とする請求項1から3のいずれか1つに記載の電子時計。 - 前記回転検出回路は、選択指示した前記通常パルスに対応した周波数を前記周波数選択回路に指示する
ことを特徴とする請求項4に記載の電子時計。 - 前記回転検出回路は、選択指示した前記通常パルスに対応して、
前記各検出区間における検出条件を変更する
ことを特徴とする請求項4に記載の電子時計。 - 前記通常パルスの出力回数をカウントする周波数カウント回路を有し、
前記回転検出回路は、特定の前記駆動力における前記通常パルスの出力回数が所定回数に達した場合に、前記通常パルスの駆動力を変更するよう、前記駆動力を選択する
ことを特徴とする請求項4から6のいずれか1つに記載の電子時計。 - 前記回転検出回路は、前記周波数選択回路が決定する前記通常パルスの駆動間隔が相対的に短い場合に、前記通常パルスの駆動力を下げるように前記通常パルスの駆動力を変更し、前記周波数選択回路が決定する前記通常パルスの駆動間隔が相対的に長い場合に、前記通常パルスの駆動力を上げるように前記通常パルスの駆動力を変更する
ことを特徴とする請求項7に記載の電子時計。 - 前記検出パルス発生回路は、
前記通常パルスでの駆動で発生する逆起電力にて、前記通常パルスと異なる側に最初に発生する電流波形を検出する第1検出パルスを発生する第1検出パルス発生回路と、
前記通常パルスでの駆動で発生する逆起電力にて、前記通常パルスと同じ側の、前記通常パルスと異なる側に最初に発生する電流波形の後に発生する電流波形を検出する第2検出パルスを発生する第2検出パルス発生回路と、
を有し、
前記回転検出回路は、前記第1検出パルスにより発生する第1検出信号及び、前記第2検出パルスにより発生する第2検出信号の少なくともいずれかに基づき、前記周波数選択回路に指示を行う
ことを特徴とする請求項1から8のいずれか1つに記載の電子時計。 - 前記検出パルス発生回路は、前記通常パルスでの駆動で発生する逆起電力にて、前記通常パルスと同じ側に、前記通常パルスの直後に発生する電流波形を検出する第3検出パルスを発生する第3検出パルス発生回路を有し、
前記回転検出回路は、前記第1検出信号と前記第2検出信号及び、前記第3検出パルスにより発生する第3検出信号の少なくともいずれかに基づき、
前記周波数選択回路に指示を行う
ことを特徴とする請求項9に記載の電子時計。 - 要因検出により、前記周波数選択回路が決定する周波数、及び、前記通常パルス発生回路が出力する前記通常パルスの駆動力の少なくともいずれかを指示する要因検出回路を有する
ことを特徴とする請求項1から10のいずれか1つに記載の電子時計。 - 前記要因検出回路が電源電圧検出回路である
ことを特徴とする請求項11に記載の電子時計。 - 補正パルスを発生し前記パルス選択回路に出力する補正パルス発生回路を有し、
前記回転検出回路は、
前記ステップモータが非回転であると判定した場合に前記パルス選択回路に前記補正パルスの出力を指示するとともに、
前記周波数選択回路に対し、前記補正パルスの出力が可能な周波数を指示する
ことを特徴とする請求項1から12のいずれか1つに記載の電子時計。 - 前記回転検出回路は、
前記第1検出パルスにより発生する前記第1検出信号が検出されて以降で、前記第1検出信号が検出されなくなったタイミングを検出して前記第2検出パルス発生回路に通知し、
前記第2検出パルス発生回路は前記タイミング以降に第2検出パルスを発生させる
ことを特徴とする請求項9に記載の電子時計。 - ステップモータと、
該ステップモータを駆動するための通常パルスを出力する通常パルス発生回路と、
前記通常パルスで前記ステップモータを駆動後、前記ステップモータが回転したか否かを検出する検出パルスを出力する検出パルス発生回路と、
前記通常パルスと前記検出パルスを選択出力するパルス選択回路と、
該パルス選択回路から出力されたパルスを前記ステップモータに負荷するドライバ回路と、
前記検出パルスにより発生する検出信号を入力し、前記ステップモータが回転したか否かを判定する回転検出回路と、
を有し、
前記検出パルス発生回路は、
前記通常パルスでの駆動で発生する逆起電力にて、前記通常パルスと異なる側に最初に発生する電流波形を検出する第1検出パルスを発生する第1検出パルス発生回路と、
前記通常パルスでの駆動で発生する逆起電力にて、前記通常パルスと同じ側の、前記裏の山の後に発生する電流波形を検出する第2検出パルスを発生する第2検出パルス発生回路と、
を有し、
前記回転検出回路は、前記第1検出パルスにより発生する前記第1検出信号が検出されて以降で、前記第1検出信号が検出されなくなったタイミングを検出して前記第2検出パルス発生回路に通知し、
前記第2検出パルス発生回路は前記タイミング以降に第2検出パルスを発生させる
ことを特徴とする電子時計。
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