JP2013255393A - Drive control device and drive control method for pulse-width control motor and electronic watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device for a pulse-width control motor that can stably drive the pulse-width control motor and also can reduce current consumption.SOLUTION: A drive control device 30 comprises a drive control circuit 35 for controlling drive of motors 70 and 80 and a rotation detection circuit 36 for detecting whether or not rotors 701 and 801 rotate. The drive control circuit 35 comprises a drive pulse output section 351 for outputting a drive pulse constituted of a preset number of interdigital pulses to the motors 70 and 80 and an auxiliary pulse output section 353 for outputting an auxiliary pulse to the motors 70 and 80 when the motors 70 and 80 fail to rotate. The drive pulse output section 351 comprises a first drive control mode that increases a duty of the drive pulse output subsequent to the auxiliary pulse at the time of non-rotation of the rotors 701 and 801 by a first set value and decreases the duty of the drive pulse by a second set value greater than the first set value when the rotors 701 and 801 continuously rotate a set number of times.

Description

  The present invention relates to a drive control device, a drive control method, and an electronic timepiece for a pulse width control motor.

As a drive control method for a stepping motor of an electronic timepiece, a method for detecting the rotation / non-rotation of a rotor and controlling the pulse width of a drive pulse for driving the motor is known (see Patent Document 1).
The electronic timepiece of Patent Document 1 is configured so that the duty of the normal drive pulse can be changed from 8/16 to 15/16, and if the rotation of the rotor continues for 60 seconds by the input of the normal drive pulse, the duty of the normal drive pulse is reduced. Decrease by 1/16.
On the other hand, when the normal drive pulse is input and the rotor is not rotated, the correction pulse is output to rotate the rotor, and the duty of the normal drive pulse is increased by 1/16 from the next step.

JP 58-15182 A

  However, in Patent Document 1, there is a problem in that it is difficult to sufficiently suppress current consumption because the duty of the normal drive pulse is always decreased by 1/16 and the ratio is the same as the increase.

For example, when the motor is started after a system reset or when the load temporarily increases, a larger driving torque is required. For this reason, when the rotor is not rotated by the normal drive pulse, the duty of the normal drive pulse increases by 1/16 each time non-rotation is detected, and the duty increases in a short time.
On the other hand, even if the load is reduced to the original state, the decrease in the duty of the normal drive pulse is only decreased by 1/16 when no rotation is detected for 60 seconds. For this reason, there is a problem that it takes time to decrease to the minimum duty necessary for rotating the rotor, and wasteful current consumption occurs during that time, and it is difficult to sufficiently suppress the current consumption.

  An object of the present invention is to provide a drive control device, a drive control method, and an electronic timepiece for a pulse width control motor that can stably drive the pulse width control motor and reduce current consumption.

  The drive control device for the pulse width control motor of the present invention comprises drive control means for controlling the drive of the pulse width control motor, and rotation detection means for detecting whether the rotor of the pulse width control motor has rotated, The drive control means includes a drive pulse output unit that outputs a drive pulse including a predetermined number of comb-tooth pulses to the pulse width control motor, and an auxiliary pulse having a pulse width larger than the drive pulse. An auxiliary pulse output unit that outputs to the motor, and the auxiliary pulse output unit outputs the auxiliary pulse when the rotation detection unit cannot detect that the rotor has rotated, and the drive pulse output unit When the rotation detecting means cannot detect the rotation of the rotor, the duty of the drive pulse output after the auxiliary pulse Is increased by the first set value, and when the rotation detecting means detects that the rotor has rotated continuously a set number of times, the duty of the drive pulse is set to a second set value that is larger than the first set value. The first drive control mode is set to be made as small as possible.

In the present invention, since the driving pulse is composed of a predetermined number of comb-tooth pulses, the duty of each comb-tooth pulse is the duty of the driving pulse. Therefore, by adjusting the duty of the comb-tooth pulse, the duty of the driving pulse is also adjusted, and the driving energy supplied to the motor is adjusted. In other words, since the comb pulse has a constant period (frequency) and the number of inputs is set, the pulse width of the drive pulse is also constant. When the duty of the drive pulse (comb pulse) is increased, the drive energy supplied to the motor is also increased, and when the duty of the drive pulse (comb pulse) is decreased, the drive energy is also decreased. Therefore, the drive of the motor can be controlled by adjusting the duty of the drive pulse.
If the rotor of the pulse width control motor does not rotate by the input of the drive pulse, the auxiliary pulse output unit outputs the auxiliary pulse. Since the auxiliary pulse has a pulse width larger than that of the drive pulse, the rotor can be reliably rotated even when the rotor does not rotate due to the input of the drive pulse due to the start of the motor or an increase in load.
The drive pulse output unit increases the duty of the drive pulse output after the auxiliary pulse by the first set value. For example, when the duty of the drive pulse can be changed step by step from 1/64 to 63/64 and the first set value is set to 1/64, the drive pulse output unit inputs the drive pulse. The duty of the drive pulse is increased by 1/64 until the rotor rotates. During this time, an auxiliary pulse is output, so that the rotor can be rotated reliably.
Further, the drive pulse output unit reduces the duty of the drive pulse by a second set value when the rotor rotates continuously a set number of times. For example, when the second set value is 2/64, the drive pulse output unit sets the duty of the drive pulse to 2/64 when the rotation of the rotor continues while the drive pulse is input the set number of times. Decrease. This decrease in the duty of the drive pulse continues until the rotor is not rotated.

In the present invention, the second setting value, which is the amount of decrease when decreasing, is larger than the first setting value, which is the amount of increase when increasing the duty of the drive pulse. Compared to the conventional example, the duty of the drive pulse can be quickly set to a necessary minimum value.
Accordingly, it is possible to reduce the period for driving the motor with a drive pulse having an excessive duty (energy), and to prevent unnecessary current consumption from occurring, and thus the current consumption of the pulse width control motor can be sufficiently suppressed. .

  In the present invention, when the rotation detection unit cannot detect the rotation of the rotor, the drive pulse output unit increases the duty of the drive pulse output after the auxiliary pulse by a first set value, and the rotor A second drive control mode for reducing the duty of the drive pulse by a first set value when the rotation detection means detects that the set number of rotations has continued, and at the time of starting the pulse width control motor, When the rotor is not rotated by the drive pulse controlled in the first drive control mode and reduced by the second set value, it is preferable to shift to the second drive control mode.

When starting the pulse width control motor, it is preferable to output a drive pulse with a relatively large duty so that the rotor rotates reliably by the input of the drive pulse. Therefore, the drive pulse output unit increases the initial value of the duty of the drive pulse at the start of startup to 32/64, for example, when the duty of the drive pulse during normal drive is about 28/64. Therefore, it is preferable to set so that the motor is driven reliably. On the other hand, if a drive pulse having a large duty is continuously input, there is a problem that current consumption increases.
On the other hand, in the present invention, since the control is performed in the first drive control mode at the time of starting the motor, there is a high possibility that the motor can be driven without using the auxiliary pulse, and the current consumption can be reduced as compared with the case of driving with the auxiliary pulse. .
If the rotor continues to rotate, the duty can be reduced by the second set value. Since the second set value is larger than the first set value when the duty is increased, the duty of the drive pulse can be quickly reduced. For this reason, it is possible to minimize the state of inputting a drive pulse with a duty (energy) that is more than necessary, and to reduce current consumption.
Furthermore, when the duty of the drive pulse is lowered in the first drive control mode and the rotor does not rotate, the mode is switched to the second drive control mode. In this second drive control mode, the duty can be increased or decreased for each first set value by rotating or non-rotating the rotor, and the motor can be driven with the minimum duty drive pulse necessary for rotating the rotor. Current consumption can be reduced and control can be performed efficiently.

  In the present invention, there is provided heavy load period detection means for detecting that a heavy load period (high load period) in which a load driven by the pulse width control motor becomes a heavy load (high load) is provided, and the drive pulse The output unit increases the duty of the drive pulse output after the auxiliary pulse by a first set value when the rotation detection unit cannot detect the rotation of the rotor, and the rotor rotates continuously a set number of times. A second drive control mode for reducing the duty of the drive pulse by a first set value when the rotation detection means detects that the heavy load period has been started by the heavy load detection means. When detected, the rotor is not rotated by the drive pulse controlled in the first drive control mode and reduced by the second set value. It is preferable to shift to the second drive control mode.

During a period when the load driven by the pulse width control motor is a heavy load (high load), it is preferable to output a drive pulse having a relatively large duty so that the rotor is reliably rotated by the input of the drive pulse. For this reason, for example, when the duty of the driving pulse during normal driving is about 28/64, the driving pulse output unit sets the initial value of the duty of the driving pulse to 32/64 at the start of the heavy load period. It is preferable to increase the setting so that the motor can be driven reliably. On the other hand, if a drive pulse having a large duty is continuously input, there is a problem that current consumption increases.
On the other hand, in the present invention, since the control is performed in the first drive control mode during the heavy load period, the duty can be reduced by the second set value as long as the rotor continues to rotate. Since the second set value is larger than the first set value when the duty is increased, the duty of the drive pulse can be quickly reduced. For this reason, it is possible to minimize the state in which a drive pulse with an excessive duty (energy) is input, and the duty of the drive pulse can be quickly reduced even after the heavy load period ends, so that current consumption can be reduced. .
Furthermore, when the duty of the drive pulse is lowered in the first drive control mode and the rotor does not rotate, the mode is switched to the second drive control mode. In this second drive control mode, the duty can be increased or decreased for each first set value by rotating or non-rotating the rotor, and the motor can be driven with the minimum duty drive pulse necessary for rotating the rotor. Current consumption can be reduced and control can be performed efficiently.

  In the present invention, the drive pulse output unit can change the duty of the drive pulse from 1/64 to 63/64, the first set value is 1/64, and the second set value is 2 / 64 is preferred.

  According to the present invention, since the duty of the drive pulse can be changed in 63 steps, it can be set finely. For this reason, since the duty can be adjusted with a fineness of about 1/4 compared with the case where the duty is adjusted by 1/16 each as in the above-mentioned Patent Document 1, the minimum necessary duty can be set, and consumption Current can be minimized. For example, when the duty capable of driving the motor is 9/64 and cannot be driven at a duty of 8/64 (= 2/16), in Patent Document 1, the duty is set to 3/16 (= 12/64). There is a need. On the other hand, in the present invention, the duty can be set to 9/64, and the duty can be set to be smaller than that in the case where the duty is adjusted by 1/16, so that the current consumption can be reduced.

  The present invention is a drive control method for controlling the drive of a pulse width control motor, wherein a drive pulse comprising a predetermined number of comb-tooth pulses is output to the pulse width control motor, and the rotor of the pulse width control motor If the rotation of the rotor cannot be detected, an auxiliary pulse having a pulse width larger than the drive pulse is output to the pulse width control motor, and the auxiliary pulse When the duty of the drive pulse to be output later is increased by a first set value, and it is detected that the rotor has continuously rotated a set number of times, the duty of the drive pulse is set to a value greater than the first set value. It is characterized in that it is reduced by 2 set values.

Also in the present invention, similarly to the drive control device, the second setting that is a decrease amount when the drive pulse duty of the pulse width control motor is decreased compared to the first set value that is an increase amount when the duty of the drive pulse of the pulse width control motor is increased. Since the value is large, the duty of the driving pulse can be quickly set to a necessary minimum value as compared with the conventional example in which the value is decreased as compared with the conventional example in which the first setting value is used.
Accordingly, it is possible to reduce the period for driving the motor with a drive pulse having an excessive duty (energy), and to prevent unnecessary current consumption from occurring, and thus the current consumption of the pulse width control motor can be sufficiently suppressed. .

  The electronic timepiece of the invention includes a pulse width control motor, a drive control device for the pulse width control motor, and a time display member driven by the pulse width control motor.

  According to the electronic timepiece of the invention, the driving of the pulse width control motor that drives the time display member such as the hands and the calendar wheel is controlled using the drive control device of the pulse width control motor. It can be suppressed sufficiently. For this reason, in particular, in a portable electronic timepiece such as a wristwatch, the current consumption can be reduced, and the driving duration can be increased.

  The electronic timepiece of the invention includes a pulse width control motor, a drive control device for the pulse width control motor, an hour hand and a calendar wheel driven by the pulse width control motor, and the heavy load period detection means includes an hour hand That the heavy load period is started when the light load state (low load state: normal load state) is switched to the heavy load state (high load state) where the hour hand and the calendar wheel are simultaneously driven. To detect.

  According to the electronic timepiece of the invention, since the driving of the pulse width control motor for driving the hands and the calendar wheel is controlled using the drive control device for the pulse width control motor, the current consumption can be sufficiently suppressed. Therefore, in particular, when the light load state (normal load state) in which only the hour hand is driven is switched to the heavy load state in which the hour hand and the calendar wheel are simultaneously driven, a drive pulse having a large duty can be input. For this reason, the motor can be driven without using the auxiliary pulse, and the current consumption of the electronic timepiece can be reduced.

The top view which shows the electronic timepiece which concerns on embodiment of this invention. The perspective view which shows the outline inside the said electronic timepiece. The perspective view which shows the outline when the inside of the said electronic timepiece is seen from the back cover side. FIG. 3 is an exploded perspective view showing a driving wheel train and a second minute wheel train disposed between a sensor board and a circuit board of the electronic timepiece. The disassembled perspective view which shows the state which looked up the date dial of the said electronic timepiece toward the sensor board | substrate side from the circuit board side. FIG. 2 is a plan view schematically showing an enlarged part of the inside of the electronic timepiece. FIG. 3 is an exploded perspective view showing an arrangement relationship of gears constituting a drive wheel train when the inside of the electronic timepiece is viewed from the back cover side. FIG. 3 is an exploded perspective view showing an arrangement relationship of gears constituting a second minute wheel train when the inside of the electronic timepiece is viewed from the back cover side. The figure which shows the drive control apparatus of the motor of the said electronic timepiece. The flowchart which shows the 1st drive control mode of the said motor. The signal waveform figure which shows the drive pulse of the said motor. The signal waveform figure which shows the drive pulse and auxiliary pulse of the said motor. The flowchart which shows the 2nd drive control mode of the said motor.

An electronic timepiece according to an embodiment of the present invention will be described with reference to the drawings.
[Configuration of electronic watch]
As shown in FIG. 1, the electronic timepiece 1 includes an hour hand 11, a minute hand 12, a second hand 13, and a dial 14. Furthermore, the electronic timepiece 1 includes a date wheel 21 as a calendar wheel for displaying a date as calendar information from a date window 15 formed on the dial 14.
This electronic timepiece 1 is composed of a timepiece main body 10 shown in FIGS. 2 and 3 and an outer case 16 (see FIG. 1) for housing the timepiece main body 10, and is a wristwatch type that is used by being worn on a wrist by a user. It is said that. In addition, the electronic timepiece 1 receives a standard radio wave as an external signal on which time information is superimposed, and detects a hand position that corrects the display time indicated by the hour hand 11, the minute hand 12, and the second hand 13 based on the received time information. This is a radio-controlled watch with functions.

[Configuration of the watch body]
As shown in FIG. 2, the timepiece main body 10 includes a movement 2 and a dial receiving ring member 3. The electronic timepiece 1 includes a solar battery (not shown), and uses the power generated by the solar battery by charging the secondary battery 17 shown in FIG. A translucent dial 14 is disposed on the front side of the solar cell.

The movement 2 includes a ground plane 20 (see FIGS. 2 and 3), a sensor board 4 (see FIG. 4), and a circuit board 5 (see FIG. 4). The sensor board 4 and the circuit board 5 are arranged with the ground plate 20 inside the electronic timepiece 1 interposed therebetween. As shown in FIGS. 4 and 5, the sensor board 4 and the circuit board 5 are provided with a first detection unit 6A, a second detection unit 6B, and a third detection unit 6C. The detection units 6A, 6B, and 6C detect the rotational positions of gears (detection wheel 25 and the like) incorporated in the movement 2, detect the positions of the hour hand 11, the minute hand 12, and the second hand 13 based on the rotational positions, and the hour hands 11 It is detected whether the indicated time is morning or afternoon. In the present embodiment, the first detection unit 6A is used to detect the position of the hour hand 11, and the second detection unit 6B is used to detect the positions of the minute hand 12 and the second hand 13. The third detector 6C is used to detect whether the time indicated by the hour hand 11 corresponds to morning or afternoon. Details of the detection units 6A, 6B, and 6C will be described later.
The movement 2 incorporates a first motor 70 and a second motor 80 shown in FIGS. 3, 7, and 8. In this embodiment, stepping motors are used as the first motor 70 and the second motor 80. The first motor 70 and the second motor 80 constitute a pulse width control motor of the present invention.
Since the structure of the other movement 2 employs a general structure, the description is simplified. Moreover, since the back cover is also a general structure, description is abbreviate | omitted.

A date wheel 21 as a calendar wheel is arranged on the dial 14 side of the main plate 20 as shown in FIG. A sensor board 4 is disposed on the inner periphery of the date dial 21. The circuit board 5 is arranged on the back cover side (back side) of the base plate 20.
The date wheel 21 is printed with a number representing the date (in FIG. 1, only “1” is displayed), and the date is displayed by exposing the number from the date window 15 of the dial 14. Is done.
Drive teeth 211 are formed on the inner peripheral surface of the date dial 21. A date jumper 29 provided on the main plate 20 is engaged with the drive teeth 211. The date jumper 29 is formed of an elastic member, and regulates the position after the rotation by the elastic force of the date jumper 29 when the date indicator 21 is rotated by one pitch.

FIG. 6 is a plan view schematically showing an enlarged part of the inside of the timepiece, and shows a driving wheel train 22 for driving the date wheel 21 and the hour hand 11. FIG. 7 is an exploded perspective view showing a schematic configuration of the drive wheel train 22 as viewed from the back cover side. FIG. 8 shows a schematic exploded perspective view of the second minute wheel train 80A for transmitting the driving force from the second motor 80 to the minute hand 12 and the second hand 13 as seen from the back cover side. 7 and 8, for convenience of explanation, members such as the ground plane 20 are omitted, and some of the plurality of gears are shown separated from each other.
The drive wheel train 22 and the second minute train wheel 80A are arranged between the sensor board 4 and the circuit board 5, as shown in FIG.
As shown in FIGS. 4 and 7, the drive wheel train 22 includes a first intermediate wheel 71, a second intermediate wheel 72, a third intermediate wheel 73, an hour wheel 28, a fourth intermediate wheel 27, a fifth intermediate wheel 26, A detection wheel 25, a date indicator driving intermediate wheel 24, and a date indicator driving wheel 23 as a driving vehicle are constituted, and these gears rotate in conjunction with each other.
As shown in FIGS. 3, 4, and 8, the second minute wheel train 80 </ b> A includes a fifth wheel 81, a second wheel (fourth wheel) 82, a third wheel 83, and a second wheel 84. The gears rotate in conjunction with each other.

First, the drive wheel train 22 will be described.
A driving force for driving the date dial 21 is transmitted from the first motor 70 via the driving wheel train 22. In the present embodiment, the driving force from the first motor 70 is first transmitted to the first intermediate wheel 71, and in order from the first intermediate wheel 71, the second intermediate wheel 72, the third intermediate wheel 73, the hour wheel 28. , The fourth intermediate wheel 27, the fifth intermediate wheel 26, the detection wheel 25, the date turning intermediate wheel 24, and the date turning wheel 23 are transmitted to the date indicator 21.

As shown in FIG. 7, the first intermediate wheel 71 includes a gear 711 that meshes with a rotor kana 702 formed integrally with the rotor 701 of the first motor 70, and a pinion. The first intermediate wheel 71 is formed with a through hole 713 that penetrates in the thickness direction of the gear 711.
The second intermediate wheel 72 includes a gear 721 that meshes with the pinion of the first intermediate wheel 71 and a pinion 722. The second intermediate wheel 72 is formed with a through hole 723 that penetrates in the thickness direction of the gear 721.
The third intermediate wheel 73 includes a gear 731 that meshes with the pinion 722 of the second intermediate wheel 72 and a pinion 732. The third intermediate wheel 73 is formed with two through holes 733 penetrating in the thickness direction of the gear 731.

The hour wheel 28 meshes with the pinion 732 of the third intermediate wheel 73 and the gear 271 of the fourth intermediate wheel 27. As shown in FIGS. 4 and 10, the hour wheel 28 is disposed closer to the back cover than the intermediate date wheel 24 in the thickness direction of the electronic timepiece 1. That is, in the thickness direction of the electronic timepiece 1, a space from the hour wheel 28 to the height position of the intermediate wheel 24 and the date wheel 21 is provided between the sensor substrate 4 and the hour wheel 28.
A driving force from the first motor 70 is transmitted to the hour wheel 28 via the above-described intermediate gears 71, 72, 73. In addition, the hour hand 11 is fixed to the hour wheel 28, and the hour hand 11 also rotates as the hour wheel 28 rotates. That is, the first motor 70 drives the hour hand 11 and drives the date wheel 21 via the drive wheel train 22.
In the present embodiment, the detection wheel 25 rotates once every 48 hours, and the date turning intermediate wheel 24 rotates once every 24 hours. Further, the hour wheel 28 and the hour hand 11 rotate once every 12 hours.

As shown in FIGS. 6 and 7, the hour wheel 28 is provided with a first through hole 282 for detecting the rotational position of the hour wheel 28. The first through hole 282 also penetrates in the thickness direction of the hour wheel 28 and is detected by the first detection unit 6 </ b> A provided in the sensor board 4 and the circuit board 5. The rotation position of the hour wheel 28 when the first through hole 282 is detected by the first detection unit 6A is set as the first reference position.
The hour wheel 28 has a larger diameter than the second wheel 84 and the second wheel 82, and the position where the first through hole 282 is provided is when the hour wheel 28 is viewed in its axial direction. It is outside the outer periphery of the center wheel & pinion 84 and second wheel 82. When viewed in the axial direction of the hour wheel 28, it means a case where the hour wheel 28, the second wheel & pinion 84, and the second wheel 82 are viewed in plan with their central axes overlapped.
As shown in FIGS. 6 and 7, twelve second through holes 283 are formed inside the first through hole 282 of the hour wheel 28. The second through hole 283 also penetrates in the thickness direction of the hour wheel 28. These second through holes 283 are formed at equal angles (30 degrees) with respect to the center of the hour wheel 28 in plan view. That is, the second through holes 283 are formed at equal intervals on a concentric circle inside the first through hole 282 when the hour wheel 28 is viewed in the axial direction.

The fourth intermediate wheel 27 includes a gear 271 that meshes with the hour wheel 28 and a pinion 272 that meshes with the fifth intermediate wheel 26. The gear 271 is provided on the back cover side with respect to the pinion 272.
The fifth intermediate wheel 26 includes a gear 261 that meshes with the pinion 272 of the fourth intermediate wheel 27 and a pinion 262 that meshes with the detection wheel 25. The gear 261 is provided closer to the dial plate than the pinion 262.

The detection wheel 25 meshes with a pinion 242 provided on the back cover side of the intermediate date wheel 24 and a pinion 262 provided on the back cover side of the fifth intermediate wheel 26. In the present embodiment, the detection wheel 25 is a spur gear.
The detection wheel 25 is provided with a fifth through hole 251 for allowing the third detection portion 6C to detect the rotational position of the detection wheel 25. The rotation position of the detection wheel 25 when the fifth through hole 251 is detected by the third detection unit 6C is set as the AM / PM reference position. The fifth through hole 251 is a through hole penetrating in the thickness direction of the detection wheel 25. As shown in FIG. 6, the detection wheel 25 is provided with two fifth through holes 251. The two fifth through holes 251 are arranged with the position of the rotation shaft 252 sandwiched when viewed in the direction of the rotation shaft 252 of the detection wheel 25. When the detection wheel 25 is rotated to the AM / PM reference position, the fifth through hole 251 is provided in the sensor board 4 and the circuit board 5 and is detected by the third detection unit 6C facing each other with the detection wheel 25 interposed therebetween. Is done. As will be described later, the AM / PM reference position is set to a position where the hour hand 11 indicates midnight in this embodiment.

The date turning intermediate wheel 24 transmits driving force to the date indicator 21 via the date turning wheel 23. The intermediate date driving wheel 24 includes a gear 241 that meshes with the date driving wheel 23, and a pinion 242 provided on the back cover side of the gear 241. The kana 242 meshes with the detection wheel 25. In this embodiment, the gear 241 of the date indicator driving intermediate wheel 24 is disposed at the same height as the date indicator 21 in the thickness direction of the electronic timepiece 1.
The date indicator driving wheel 23 meshes with the drive teeth 211 of the date indicator 21 and transmits the driving force to the date indicator 21. In this embodiment, the date indicator driving wheel 23 is arranged at the same height as the date indicator 21 in the thickness direction of the electronic timepiece 1.
In the present embodiment, as shown in FIGS. 2, 4, and 6, the date driving wheel 23 and the date driving intermediate wheel 24 constitute a Geneva mechanism. Therefore, the date indicator driving wheel 23 and the date indicator 21 are rotated only for a part of time during which the date indicator driving intermediate wheel 24 makes one rotation in 24 hours (one day). Therefore, the first motor 70 normally rotates only the hour hand 11 and rotates the hour hand 11 and the date indicator 21 at the same time during a part of the day, for example, from 0:00 am to 2:00 am.

Next, the second minute wheel train 80A will be described.
As shown in FIG. 8, a second wheel 84 for rotating the minute hand 12 and a second wheel 82 for rotating the second hand 13 are disposed on the back cover side of the hour wheel 28. The driving force from the second motor 80 is first transmitted to the fifth wheel 81, and from the fifth wheel 81 to the second wheel 82, the third wheel 83, and the second wheel 84 in order. Between the sensor board 4 and the circuit board 5, from the sensor board 4 side, the hour wheel 28, the second wheel 84, the third wheel 83, the fifth wheel 81, and the second wheel 82 are arranged in this order. The hour wheel 28, the second wheel & pinion 84, and the second wheel 82 are arranged on the same axis.

As shown in FIGS. 3 and 8, the fifth wheel & pinion 81 includes a gear 811 meshing with a rotor kana 802 formed integrally with the rotor 801 of the second motor 80, and a fifth wheel 81 formed on the back cover side of the gear 811. A watch guard 812 is provided. The fifth wheel & pinion 81 is formed with one through hole 813 that penetrates in the thickness direction of the gear 811.
The second wheel 82 includes a gear 821 that meshes with the fifth pinion 812 of the fifth wheel 81 and a fourth pinion formed on the dial side of the gear 821. The second wheel 82 is provided with one fourth through hole 823 that penetrates in the thickness direction of the gear 821. The fourth through hole 823 is a single through hole located on a concentric circle in which the second through hole 283 is formed when the hour wheel 28 is viewed in the axial direction, and detects the rotational position of the second wheel 82. Used for
The third wheel & pinion 83 includes a gear 831 that meshes with the fourth pinion of the second wheel 82, and a third pinion that is formed on the dial side of the gear 831. The third wheel & pinion 83 is formed with one through hole 833 penetrating in the thickness direction of the gear 831.
The second wheel & pinion 84 includes a gear 841 that meshes with the third pinion of the third wheel & pinion 83, and the second wheel & pinion 84 is formed with one third through hole 843 that penetrates in the thickness direction. The third through hole 843 is one through hole located on the concentric circle in which the second through hole 283 is formed when the hour wheel 28 is viewed in the axial direction, and detects the rotational position of the center wheel & pinion 84. Used for.

The sensor substrate 4 is disposed on the inner periphery of the date dial 21. The sensor substrate 4 holds the light emitting elements 61A, 62A, and 63A that constitute the detection units 6A, 6B, and 6C. These light emitting elements 61A, 62A, 63A correspond to the light emitting part of the present invention. As shown in FIG. 5, when the sensor substrate 4 is viewed from the back cover side, the light emitting elements 61 </ b> A, 62 </ b> A, and 63 </ b> A are provided on the surface of the sensor substrate 4 on the back cover side.
The circuit board 5 is disposed on the back cover side of the ground plane 20. The circuit board 5 holds the light receiving elements 61B, 62B, and 63B that constitute the detection units 6A, 6B, and 6C. These light receiving elements 61B, 62B, and 63B correspond to the light receiving portion of the present invention. As shown in FIG. 4, light receiving elements 61 </ b> B, 62 </ b> B, 63 </ b> B are provided on the face of the circuit board 5 on the dial plate side. In the present embodiment, a pair of light emitting elements and light receiving elements constitutes one detection unit. That is, the watch body 10 includes a first detection unit 6A and a second light emitting element 62A (second light emitting unit) each including a first light emitting element 61A (first light emitting unit) and a first light receiving element 61B (first light receiving unit). And a second detector 6B comprising a second light receiving element 62B (second light receiving part), and a third comprising a third light emitting element 63A (third light emitting part) and a third light receiving element 63B (third light receiving part). There are a total of three detection units called detection units 6C.
The first detection mechanism includes a first detection unit 6 </ b> A, a first through hole 282, a through hole 723, and a through hole 713.
The second detection mechanism includes a second detection unit 6B, a second through hole 283, a third through hole 843, a through hole 833, a fourth through hole 823, and a through hole 813.
The AM / PM detection mechanism includes a third detection unit 6C and a fifth through hole 251.

First, the first detection unit 6A included in the first detection mechanism and the second detection unit 6B included in the second detection mechanism will be described.
When the sensor substrate 4 is incorporated into the watch body 10, the first light emitting element 61 </ b> A and the second light emitting element 62 </ b> A are respectively arranged on the dial 14 side (front side) of the hour wheel 28. Further, when the circuit board 5 is incorporated in the watch body 10, the first light receiving element 61 </ b> B and the second light receiving element 62 </ b> B are respectively disposed on the back cover side of the second wheel 82.
The first light emitting element 61A and the first light receiving element 61B are arranged to face each other across the hour wheel 28, and the second light emitting element 62A and the second light receiving element 62B are the hour wheel 28 and the second wheel. 84, they are arranged opposite to each other across the second wheel 82. Here, as described above, in the thickness direction of the electronic timepiece 1, a space from the hour wheel 28 to the height position of the intermediate wheel 24 and the date wheel 21 is provided between the sensor board 4 and the hour wheel 28. ing. When the sensor substrate 4 is assembled in the watch body 10, the first light emitting element 61A and the second light emitting element 62A are arranged in this space.

The first detector 6A including the first light emitting element 61A and the first light receiving element 61B detects the first through hole 282, the through hole 723, and the through hole 713, and detects whether the hour hand 11 is in a predetermined position. Used for. The first light emitting element 61A emits first detection light toward the movement trajectory of the first through hole 282, and the first light receiving element 61B receives the first detection light. As described above, the position where the first through hole 282 is provided is outside the outer periphery of the center wheel & pinion 84 and the second wheel 82. Therefore, the first detection light is emitted from the first light emitting element 61 </ b> A toward the movement trajectory of the first through hole 282, and if it passes through the first through hole 282, it is blocked by the second wheel 84 and the second wheel 82. Absent. Further, as shown in FIGS. 4 and 7, the first intermediate wheel 71 and the second intermediate wheel 72 are partially overlapped on the optical path of the first detection light. Here, the through hole 713 of the first intermediate wheel 71 and the through hole 723 of the second intermediate wheel 72 are formed so as to rotate and move on the optical path at the timing when the first detection light passes through the first through hole 282. Has been. Therefore, when the first detection light emitted from the first light emitting element 61A passes through the first through hole 282, it also passes through the other two through holes 723 and 713 and is received by the first light receiving element 61B.
Since the hour wheel 28 rotates once every 12 hours, the first through hole 282 moves to the position facing the first detection unit 6A every 12 hours. In the present embodiment, the hour hand 11 is set so that the first through hole 282, the through hole 723, and the through hole 713 are detected at positions indicating midnight and 0:00. That is, the rotational positions of the hour wheel 28, the first intermediate wheel 71, and the second intermediate wheel 72 when the hour hand 11 indicates 0:00 am and 0:00 pm are set as the above-described first reference position. For this reason, the first detection unit 6A is activated when the internal clock reaches midnight and midnight. At this time, when the light emitted by the first light emitting element 61A of the first detection unit 6A is received by the first light receiving element 61B through the first through hole 282, the first through hole 282 is detected. It can be confirmed that the hour hand 11 indicates the 0 o'clock position. On the other hand, when the light of the first light emitting element 61A cannot be received by the first light receiving element 61B, the internal clock and the actual indication of the hour hand 11 are shifted. In this case, each time the first motor 70 is driven by one step in rapid traverse, the first detection unit 6A is operated to perform a hand position detection process for detecting the position (first reference position) where the hour hand 11 indicates 0:00. Just do it. Thereafter, the first motor 70 may be driven to move the hour hand 11 in accordance with the time of the internal clock.

The second detection unit 6B including the second light emitting element 62A and the second light receiving element 62B includes one of twelve second through holes 283, a third through hole 843, a through hole 833, and a fourth through hole. It is used to detect the hole 823 and the through hole 813 and detect whether the minute hand 12 and the second hand 13 are at predetermined positions. The second light emitting element 62A emits second detection light toward the above-described concentric circle in which the second through hole 283 is formed, and the second light receiving element 62B receives the second detection light.
Since the hour wheel 28 in which the twelve second through holes 283 are concentrically formed at equal intervals rotates once every 12 hours as described above, the second through hole 283 faces the second detection unit 6B. It moves to the position to be every hour. Since the second wheel & pinion 84 in which one third through-hole 843 is formed rotates once every hour, the third through-hole 843 moves to the position facing the second detection unit 6B every hour. Come on. Since the second wheel 82 in which one fourth through-hole 823 is formed rotates once every minute, the fourth through-hole 823 moves every minute to a position facing the second detection unit 6B. come. In the present embodiment, the second through-hole 283, the third through-hole 843, and the fourth through-hole 823 move on the hour such as 0, 1, 2 and 2:00, and the minute hand 12 and the second hand 13 Are overlapped when moved to the 0 o'clock position. In addition, as shown in FIGS. 4 and 8, a fifth wheel 81 and a third wheel 83 are partially overlapped between the second wheel 82 and the second wheel 84. The through hole 813 of the fifth wheel & pinion 81 and the through hole 833 of the third wheel & pinion 83 also overlap with the through holes 283, 843 and 823 at this timing. Therefore, these through holes 283, 843, 833, 813, and 823 overlap each other once an hour. Therefore, the second detection light emitted from the second light emitting element 62A toward the concentric circle by operating the second detection unit 6B at the time when the internal clock reaches each hour is the five through holes 283. , 843, 833, 813, 823 and received by the second light receiving element 62B. The rotational positions of the second wheel 84, the third wheel 83, the second wheel 82, and the fifth wheel 81 when the minute hand 12 and the second hand 13 are moved to the 0 o'clock (0 minute 0 second) position are the second reference positions. It is said. If the light of the second light emitting element 62A cannot be received by the second light receiving element 62B at the time of each hour, the time indicated by the internal clock, the minute hand 12, and the second hand 13 is different. . For this reason, each time the second motor 80 is driven by one step in rapid traverse, the second position detection unit 6B is activated to check the minute hand 12 and the second hand 13, and then the second motor 80 is driven. The minute hand 12 and the second hand 13 may be moved according to the time of the internal clock.

Next, the 3rd detection part 6C with which an AM / PM detection mechanism is provided is demonstrated.
When the sensor board 4 and the circuit board 5 are assembled into the watch body 10, the third detection unit 6 </ b> C is arranged at a position facing the detection wheel 25. That is, the third detector 6C and the detection wheel 25 face each other without interposing other gears such as the intermediate wheel 24 and the fifth intermediate wheel 26 between them. At this time, the third light emitting element 63A is disposed on the dial 14 side (front side) of the detection wheel 25, and the third light receiving element 63B is disposed on the back cover side of the detection wheel 25. The third light emitting element 63A and the third light receiving element 63B are disposed to face each other with the detection wheel 25 interposed therebetween. Here, as described above, in the thickness direction of the electronic timepiece 1, a space from the detection wheel 25 to the height position of the intermediate date wheel 24 and the date wheel 21 is provided on the dial 14 side of the detection wheel 25. Yes.

When the detection wheel 25 rotates and the fifth through hole 251 moves to a position (AM / PM reference position) opposite to the third light emitting element 63A and the third light receiving element 63B, the fifth through hole 251 extends from the third light emitting element 63A. The third detection light emitted toward the movement locus of the first light passes through the through hole and can be received by the third light receiving element 63B. As described above, the third light receiving element 63B receives the third detection light, so that it can be detected that the detection wheel 25 has been rotated to the AM / PM reference position. The operation of the third detection unit 6C is operated at the same timing as the second detection unit 6B. That is, when the internal clock reaches midnight and midnight, the second detector 6B and the third detector 6C are activated.
In the present embodiment, the detection wheel 25 rotates once every 48 hours, and the two fifth through holes 251 are arranged with the position of the rotation shaft 252 of the detection wheel 25 interposed therebetween. Therefore, the detection wheel 25 rotates to the AM / PM reference position once every 24 hours. At this time, one of the fifth through holes 251 rotates to a position facing the third light emitting element 63A and the third light receiving element 63B. Therefore, the third detection unit 6C can detect the fifth through hole 251 every time the detection wheel 25 rotates for 24 hours. Therefore, when the internal clock becomes midnight and midnight, the second detection unit 6B confirms that the hour hand 11 is located at 0:00. At this time, since the rotation position of the detection wheel 25 corresponding to midnight is set to the AM / PM reference position, the third detection portion 6C performs the detection process of the fifth through-hole 251 to thereby set the hour hand It is possible to determine whether the position of “0 o'clock” 11 corresponds to midnight or midnight. If it is midnight, the third detection light passes through the fifth through hole 251 and is detected by the third light receiving element 63B. If it is 0:00, the third detection light passes through the fifth through hole 251. This is because it cannot be detected by the third light receiving element 63B. Accordingly, when the internal clock is midnight, the third detection portion 6C can detect the fifth through hole 251. When the internal clock is midnight, the third detection portion 6C cannot detect the fifth through hole 251. It can be confirmed that the clock and the time indication by the hour hand 11 are consistent.
On the other hand, if the third detection unit 6C cannot detect the fifth through-hole 251 when the internal clock is midnight, the second detection unit 6B, The position of the hour hand 11 and the fifth through hole 251 are confirmed by performing a hand position detecting process for operating the detecting unit 6C, and then the first motor 70 is driven to match the time of the internal clock and the hour hand 11 and the detection wheel 25. Just move. Further, when the third detection portion 6C detects the fifth through-hole 251 when the internal clock is 0:00 pm, the hour hand 11 is shifted by 12 hours. What is necessary is just to drive at a rapid feed until it moves for 12 hours.
In this embodiment, the date indicator driving wheel 23 and the date indicator driving intermediate wheel 24 are set so that the date indicator 21 starts to rotate at midnight. For this reason, heavy load period detection means (high load period detection means) for detecting a heavy load period (high load period) in which the hour hand 11 and the date indicator 21 rotate simultaneously are configured by the third detection unit 6C.

Next, the drive control device 30 for the first motor 70 and the second motor 80 in the present embodiment will be described.
The drive control device 30 includes an oscillation circuit 32 that outputs a reference pulse of a predetermined frequency using a reference oscillation source 31 such as a crystal resonator, a frequency divider circuit 33 that divides a pulse input from the oscillation circuit 32, A pulse signal generation circuit 34 for generating pulse signals having different pulse widths and timings using pulses of various frequencies input from the frequency divider circuit 33, and a first motor 70 based on the pulse signal supplied from the pulse signal generation circuit 34. A drive control circuit 35 that controls the drive of the second motor 80 and a rotation detection circuit 36 that detects the rotation of the rotors 701 and 801.

The drive control circuit 35 outputs a drive pulse to the drive coils of the first motor 70 and the second motor 80 via the drive circuit 40, and detects the rotation of the rotors 701 and 801. A rotation detection pulse output unit 352 that outputs a pulse, and an auxiliary pulse output unit 353 that outputs an auxiliary pulse when the rotors 701 and 801 do not rotate.
Therefore, the drive control means of the present invention comprises the drive control circuit 35. Further, the rotation detection means of the present invention comprises the rotation detection circuit 36.

The drive circuit 40 includes four field effect transistors 41, 42, 43, and 44. The transistors 41 and 43 are P-channel, and the transistors 42 and 44 are N-channel. By inputting drive pulses from the drive pulse output unit 351 to these field effect transistors 41, 42, 43, and 44, motors 70 and 80 connected between the transistors 41 and 42 and between the transistors 43 and 44, respectively. A current can be passed through the coil, and the rotors 701 and 801 can be rotated.
Similarly, by inputting a rotation detection pulse from the rotation detection pulse output unit 352 to the field effect transistors 41, 42, 43, and 44, the rotation detection circuit 36 detects whether or not the rotors 701 and 801 have rotated. can do.
Further, by inputting auxiliary pulses from the auxiliary pulse output unit 353 to the field effect transistors 41, 42, 43, and 44, the rotors 701 and 801 can be reliably rotated.

[Motor drive control]
Next, the drive control method of the motors 70 and 80 by the drive control device 30 will be described with reference to FIGS. In the present embodiment, the drive control device 30 for the motor 70 and the drive control device 30 for the second motor 80 are provided, but since the configurations are the same, the following description will be made without distinguishing them. .
At the start of the motors 70 and 80 and at the start of the heavy load period, the drive control device 30 controls the drive of the motors 70 and 80 in the first drive control mode S10 of FIG. The startup time of the motors 70 and 80 means the time when the first drive control is started after the system reset.
In addition, when the heavy load period starts, when there is a light load period for driving only the hour hand 11 and a heavy load period for driving the date wheel 21 in addition to the hour hand 11 as in the first motor 70, It means the timing when the heavy load period starts. That is, in this embodiment, since the date indicator driving wheel 23 and the date indicator driving intermediate wheel 24 are Geneva mechanisms, normally, the date indicator 21 is not rotated and only the hour hand 11 is rotated. On the other hand, when the date indicator 21 is rotated, since the date indicator 21 is regulated by the date jumper 29, the load increases.
On the other hand, since the second motor 80 always drives the second hand 13 and the minute hand 12, there is little fluctuation in load, and there is no heavy load period like the first motor 70.

Therefore, the first motor 70 starts driving the date wheel 21 after the system reset and at the start of the heavy load period (when the fifth through hole 251 of the detection wheel 25 is detected by the third detection unit 6C). At midnight), the control in the first drive control mode is executed. Note that the execution timing of the first drive control mode in the heavy load period is not limited to immediately after detecting the fifth through-hole 251 by the third detection unit 6C, and is set to an arbitrary time such as a time point after 30 minutes from detection. May be. Since the date indicator 21 is regulated by the date jumper 29, the amount of deflection of the date jumper 29 is small when starting date feeding, and the load for driving the date indicator 21 is also small. And until the date indicator 21 is sent for one day, the amount of deflection of the date jumper 29 also increases, so the load for driving the date indicator 21 also increases. Accordingly, the first drive control mode is executed at the timing when the load for driving the date dial 21 becomes a predetermined value or more (for example, 30 minutes after the date feed is started) while the date dial 21 is being sent for one day. This is because the execution of the first drive control mode in the heavy load period can be limited to the minimum, and the current consumption can be reduced accordingly.
On the other hand, since the heavy load period is not set for the second motor 80, the control in the first drive control mode is executed after the system reset.

  In the first drive control mode S10, the drive pulse output unit 351 performs initial setting of the duty of the drive pulse (S11). In the present embodiment, the drive pulse output unit 351 outputs the drive pulse P1 at regular intervals t4 as shown in FIG. Here, the fixed interval t4 is, for example, one minute interval for the first motor 70 that drives the hour hand 11 and the date indicator 21, and one second interval for the second motor 80 that drives the second hand 13 and the minute hand 12.

  The drive pulse P1 is a comb-tooth pulse output for a time t3. Here, t3 is set to (1 second / 2048) × 8 = about 3.9 msec or the like when, for example, eight 2048 Hz comb-tooth pulses are output as drive pulses. The time t3 is not limited to 3.9 msec, and a time necessary for driving the motors 70 and 80 may be set, such as 2.4 to 4.4 msec.

  Each comb pulse is set, for example, at a period t2 = 1 second / 2048 = about 0.448 msec. The drive pulse output unit 351 can change the duty of the comb-tooth pulse (drive pulse), that is, t1 / t2. The drive pulse output unit 351 of the present embodiment is set so that the duty can be changed from 1/64 to 63/64.

  In S11, the drive pulse output unit 351 sets, for example, 32/64 as the initial value of the duty of the drive pulse. This initial value is set to a value larger than a duty that is normally set for driving the motors 70 and 80 so that the motors 70 and 80 can be driven reliably.

  Then, the drive pulse output unit 351 outputs the comb-tooth pulse having the duty set in S11 for the time t3 as the drive pulse P1 (S12). Since the drive pulse has a pulse width t3 set in advance, the supply energy is set according to the duty of the comb pulse, that is, the length of the period t1.

When the output of the drive pulse P1 ends, the rotation detection pulse output unit 352 outputs the rotation detection pulse SP2 (S13).
The rotation detection circuit 36 detects the presence / absence of rotation of the rotors 701 and 801 by comparing the induced voltage for rotation detection obtained by the rotation detection pulse SP2 with a set value, and feeds back the result to the drive control circuit 35 ( S14).
When it is determined Yes in S14, the rotation detection circuit 36 determines whether or not the number of times that the rotations of the rotors 701 and 801 are continuously detected is equal to or greater than the set number (S15). In the present embodiment, 80 is set as the set number of times. For this reason, in the first motor 70 to which a drive pulse is input every minute, if the rotor 701 rotates continuously 80 times (80 minutes), it is determined Yes in S15. Similarly, in the second motor 80, if the rotor 801 rotates continuously 80 times (80 seconds), it is determined Yes in S15.

When it determines with No by S15, the drive pulse output part 351 outputs the drive pulse of the same duty (S12), and repeats the process of S12-S15.
On the other hand, if it is determined Yes in S15, the drive pulse output unit 351 decreases the set value of the duty of the drive pulse by the second set value (S16).
In the present embodiment, as will be described later, the first setting value, which is an increase width when increasing the duty, is “1/64”, and the second setting value is “2/64”, which is 2 of the first setting value. It is set to double.
Therefore, if it is determined Yes in S15, the duty of the drive pulse is reduced by two steps from the initial value 32/64 and set to 30/64. At this time, the recording of the continuous rotational speed determined in S15 is also reset. That is, the continuous rotational speed determined in S15 is the number of times the rotors 701 and 801 have been rotated by drive pulses having the same duty.

After the duty is reduced in S16, the drive pulse output unit 351 outputs a drive pulse of that duty and repeats the processes of S12 to S15. Accordingly, if the drive pulse has a duty of 30/64 and is continuously rotated 80 times, the duty is further reduced by two steps in S16 to a duty of 28/64.
As described above, while the rotation of the rotors 701 and 801 is detected in S14, the processing of S12 to S16 is repeated, and every time the drive pulse is output 80 times (80 minutes or 80 seconds), Duty decreases by 2/64. However, when the duty of the driving pulse is reduced to 2/64 or less, the duty cannot be lowered further because it cannot be lowered by two steps.

  On the other hand, when it is determined in S14 that the rotors 701 and 801 are not rotating, the auxiliary pulse output unit 353 outputs the auxiliary pulse P2 as shown in FIG. 12 (S17). The auxiliary pulse P2 is a rectangular wave pulse, and its pulse width is set to a large value, for example, 6.8 msec. This is because the energy of the auxiliary pulse P2 is made sufficiently larger than that of the drive pulse P1, and the motors 70 and 80 are surely driven even when the load is large.

Then, the drive pulse output unit 351 increases the duty of the drive pulse P1 input next to the auxiliary pulse P2 by the first set value (S18). As described above, the first setting value is 1/64. Therefore, for example, when the rotors 701 and 801 do not rotate with a drive pulse having a duty of 10/64, the duty of the drive pulse output after the output of the auxiliary pulse P2 is set to 11/64.
And the drive control apparatus 30 transfers to 2nd drive control mode S20.

[Second drive control mode]
Next, control in the second drive control mode S20 will be described with reference to FIG.
In the second drive control mode, the drive control device 30 performs the drive pulse output (S22), the rotation detection pulse output (S23), the rotation detection determination (S24), and the set number of times as in S12 to S18 of the first drive control mode. The process of continuous rotation determination (S25), drive pulse duty reduction (S26), auxiliary pulse output (S27), and drive pulse duty increase (S28) is repeatedly executed.
Here, in S22, immediately after the transition from the first drive control mode, the drive pulse having the duty set in S18 is output, and thereafter, the drive pulse having the duty set in S26 or S28 is output.
In addition, when it is determined Yes in S25, the duty of the drive pulse was decreased by the second set value in S16 of the first drive control mode, but in S26 of the second drive control mode, the duty of the drive pulse was changed to the second. 1 set value is down. That is, the duty of the drive pulse was decreased by the second set value (2/64) in S16, whereas in S26, the duty was only half the first set value (1/64) and the second set value. Is down. This first set value is the same as the up amount in S28.

Then, in the case of No in S25 and after performing the processing of S26 and 28, the drive control device 30 determines whether or not it is necessary to shift to the first drive control mode (S29). The determination of Yes in S29 is when a system reset has occurred. Furthermore, in the drive control of the motor 70, it is also determined as Yes when a heavy load period is started.
If it determines with Yes in S29, the drive control apparatus 30 will perform the process of 1st drive control mode (S10). On the other hand, if it determines with No by S29, the drive control apparatus 30 will repeatedly perform the process from S22 to S29.

The electronic timepiece 1 according to this embodiment described above has the following effects.
In the electronic timepiece 1, in the first drive control mode, when the rotors 701 and 801 rotate continuously for the set number of times (Yes in S15), the duty of the drive pulse is decreased by the second set value (2/64). Yes. This second set value is set to a value that is twice as large as the first set value, which is an increase amount when the duty of the drive pulse is increased in S18. Therefore, when the rotation of the rotors 701 and 801 is continued, the duty of the drive pulse can be reduced at twice the speed as compared with the case where the duty is decreased by the first set value, and the rotors 701 and 801 are rotated. Can be set quickly to the minimum required value.
Therefore, it is possible to reduce the period for driving the motor with a drive pulse having a duty (energy) that is more than necessary, and to reduce the current consumption accordingly, so that the current consumption of the pulse width control motor can be sufficiently suppressed.

  Further, in the first drive control mode executed at the time of starting the motor after the system reset or at the start of the heavy load period, the duty of the initial drive pulse is set to a large value, for example, 32/64. The rotors 701 and 801 can be rotated without using. This makes it possible to minimize the use of the auxiliary pulse P2, which consumes a large amount of current because the pulse width t5 is larger than that of the drive pulse. In this respect, the current consumption of the pulse width control motor can be reduced.

Furthermore, since the first set value and the second set value, which are the amount of increase / decrease in the duty of the drive pulse, are set to “1/64” or “2/64”, compared with the case where the change is made by 1/16. The duty can be adjusted with a fineness of about 1/4. For this reason, the minimum duty required for driving the rotors 701 and 801 can be easily set, and the current consumption can be minimized.
As described above, since the current consumption of the pulse width control motor can be reduced, the duration time can be increased even in a wristwatch driven by a primary battery or a secondary battery.

Furthermore, since the first motor 70 drives the hour hand 11 and the date indicator 21, the load varies greatly. That is, since only the hour hand 11 is normally driven, the driving is performed with a light load. However, at midnight, the date indicator 21 is also driven at the same time, so that the driving is performed with a heavy load and the load varies greatly. In this case, if a drive pulse is set on the premise of driving with a heavy load, useless current consumption occurs at a light load. In contrast, in this embodiment, when the load is heavy, the duty of the drive pulse is increased in the first drive control mode, and when the heavy load state ends, the duty of the drive pulse can be automatically reduced by S16. Can be suppressed.
Further, the first detection unit 6A can detect that the hour hand 11 has moved to the 12 o'clock position (0 o'clock position), and the third detection unit 6C can determine whether the state is midnight or midnight. Since it can detect, the timing at which the date dial 21 is driven can be reliably detected. Therefore, the start time of the heavy load period can be reliably grasped, and the hour hand 11 and the date indicator 21 can be reliably driven in the first drive control mode.

  In addition, the first detection unit 6A, the second detection unit 6B, and the third detection unit 6C are non-contact detection mechanisms using the light emitting elements 61A, 62A, and 63A and the light receiving elements 61B, 62B, and 63B. The detection units 6A, 6B, and 6C do not become loads on the motors 70 and 80. For this reason, the load can be reduced as compared with the case where detection is performed using a contact spring or the like that contacts the train wheel, and the duty of the drive pulse can be reduced correspondingly, and the current consumption can also be reduced in this respect.

In the electronic timepiece 1, since the detection wheel 25 is provided in the drive wheel train 22 that drives the date wheel 21, it is not necessary to separately provide a detection dedicated gear.
That is, according to the electronic timepiece 1, the gear provided in the drive wheel train 22 can also be used as the detection wheel 25. Therefore, compared to the case of providing a detection-dedicated gear that meshes with the hour wheel 28 separately from the drive wheel train 22, The number of parts can be reduced and the calendar mechanism can be miniaturized. Furthermore, since the date wheel 21 and the hour hand 11 can be driven by the first motor 70, it is not necessary to provide a dedicated calendar motor for driving the calendar wheel.
Accordingly, since the hour hand 11, the minute hand 12, the second hand 13, and the date indicator 21 can be driven by the two motors 70 and 80, the movement 2 can be reduced in size. For this reason, the movement 2 can be made common in electronic watches of various sizes from women's to men's, and the cost can be greatly reduced.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

In the above-described embodiment, the optical sensors including the light emitting elements 61A, 62A, 63A and the light receiving elements 61B, 62B, 63B are used as the detection units 6A, 6B, 6C. However, a contact type sensor using a contact spring or the like is used. It may be used.
Further, the duty of the drive pulse (comb pulse) is not limited to 1/64 to 63/64 but may be changed to 1/32 to 31/32.
Furthermore, the initial setting value of the duty in the first drive control mode is not limited to 32/64, and may be an initial setting value that is different for each of the motors 70 and 80. In short, the initial set value may be set as appropriate in consideration of the load of each motor 70, 80.
Further, the first set value and the second set value in the first drive control mode are not limited to those in the above-described embodiment. For example, the second setting value may be set to three times (3/64) the first setting value.
Furthermore, in the above-described embodiment, the number of continuous rotation determinations is set to 80 in S15 and S25. However, the number of determinations is not limited to 80 and can be arbitrarily set.

  Further, the AM / PM reference position detected by the third detection unit 6C is set to, for example, 10 pm (22:00) instead of 0:00 am, and the rotation of the date indicator 21 is started at 10 pm. Good. In this case, if it takes 2 hours to send the date indicator 21 for one day, the date indicator 21 is sent from 10:00 pm to 12:00 pm (midnight), and the rotation of the date indicator 21 ends at 0:00. You can also switch the date display at the time. Similarly, the period during which the date indicator 21 is rotated may be set from 11 pm to 1 am, etc., and may be set as appropriate according to the specifications of the clock.

  Moreover, although the said embodiment gave and demonstrated the date wheel by which the date was displayed as an example as a calendar car, it is not limited to this. For example, a day wheel on which a day of the week is displayed may be a calendar car, or a calendar car that displays a month or year may be used. That is, the calendar information includes day of the week, month, and year.

DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 11 ... Hour hand, 12 ... Minute hand, 13 ... Second hand, 14 ... Dial, 21 ... Date wheel (calendar wheel), 22 ... Drive wheel train, 23 ... Date indicator (drive wheel), 24 ... Day Rotating intermediate wheel (drive wheel), 25 ... detection wheel, 251 ... fifth through hole, 28 ... cylindrical wheel, 282 ... first through hole, 283 ... second through hole, 30 ... drive control device, 35 ... drive control circuit 351, drive pulse output unit, 352, rotation detection pulse output unit, 353, auxiliary pulse output unit, 36, rotation detection circuit, 6A, first detection unit, 61A, first light emitting element (first light emission unit), 61B. ... 1st light receiving element (1st light receiving part), 6B ... 2nd detection part, 62A ... 2nd light emitting element (2nd light emitting part), 62B ... 2nd light receiving element (2nd light receiving part), 6C ... 3rd detection Part 63A ... third light emitting element (third light emitting part), 63B ... third light receiving element (third light receiving part), 70 First motor 80 ... Second motor, 82 ... second wheel, 823 ... fourth through hole, 84 ... second wheel, 843 ... third through-hole.

Claims (7)

Drive control means for controlling the drive of the pulse width control motor;
Rotation detection means for detecting whether the rotor of the pulse width control motor has rotated,
The drive control means includes
A drive pulse output unit that outputs a drive pulse composed of a predetermined number of comb pulses to the pulse width control motor;
An auxiliary pulse output unit that outputs an auxiliary pulse having a larger pulse width than the driving pulse to the pulse width control motor;
The auxiliary pulse output unit outputs the auxiliary pulse when the rotation detector cannot detect that the rotor has rotated,
The drive pulse output unit
When the rotation detecting means cannot detect the rotation of the rotor, the duty of the drive pulse output after the auxiliary pulse is increased by a first set value,
A first drive control mode for reducing the duty of the drive pulse by a second set value larger than the first set value when the rotation detecting unit detects that the rotor has rotated a set number of times continuously; A drive control device for a pulse width control motor. In the drive control device of the pulse width control motor according to claim 1,
The drive pulse output unit
When the rotation detecting means cannot detect the rotation of the rotor, the duty of the drive pulse output after the auxiliary pulse is increased by a first set value,
A second drive control mode for reducing the duty of the drive pulse by a first set value when the rotation detecting means detects that the rotor has rotated a set number of times continuously;
When the pulse width control motor is started, control is performed in the first drive control mode, and if the rotor is not rotated by the drive pulse reduced by the second set value, the mode is shifted to the second drive control mode. A drive control device for a pulse width control motor. In the drive control device of the pulse width control motor according to claim 1 or 2,
A heavy load period detecting means for detecting that a heavy load period in which a load driven by the pulse width control motor becomes a heavy load is started;
The drive pulse output unit
When the rotation detecting means cannot detect the rotation of the rotor, the duty of the drive pulse output after the auxiliary pulse is increased by a first set value,
A second drive control mode for reducing the duty of the drive pulse by a first set value when the rotation detecting means detects that the rotor has rotated a set number of times continuously;
When the heavy load detecting means detects that the heavy load period has started, the rotor is not rotated by the drive pulse controlled by the first drive control mode and reduced by the second set value. If it is, the drive control device for the pulse width control motor shifts to the second drive control mode. In the drive control device of the pulse width control motor according to any one of claims 1 to 3,
The drive pulse output unit can change the duty of the drive pulse from 1/64 to 63/64, the first set value is 1/64, and the second set value is 2/64. A drive control device for a pulse width control motor. A drive control method for controlling the drive of a pulse width control motor,
A drive pulse consisting of a preset number of comb teeth pulses is output to the pulse width control motor,
Detecting whether the rotor of the pulse width control motor has rotated,
When it is not possible to detect that the rotor has rotated, an auxiliary pulse having a pulse width larger than the drive pulse is output to the pulse width control motor,
Increase the duty of the drive pulse to be output after the auxiliary pulse by a first set value,
When it is detected that the rotor has continuously rotated a set number of times, the duty of the drive pulse is decreased by a second set value that is larger than the first set value. Control method. A pulse width control motor;
A drive control device for the pulse width control motor according to any one of claims 1 to 4,
An electronic timepiece comprising: a time display member driven by the pulse width control motor. A pulse width control motor;
A drive control device for the pulse width control motor according to claim 3,
An hour hand and a calendar wheel driven by the pulse width control motor,
The heavy load period detection means detects that the heavy load period is started when the light load state in which only the hour hand is driven switches to the heavy load state in which the hour hand and the calendar wheel are simultaneously driven. An electronic watch.

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