JP5671935B2 - Electronic clock and backlash amount setting method - Google Patents

Description

  The present invention relates to an electronic timepiece in which a hand is driven by a stepping motor and a backlash amount setting method thereof.

  There is an electronic timepiece that drives the hands by transmitting the rotational motion of a stepping motor by a train wheel mechanism. In such an electronic timepiece, when the number of gears from the stepping motor to the hands increases, play between the gears (also called backlash) increases and the stepping motor changes when the rotation direction of the stepping motor is switched. Rotational movement of is not immediately transmitted to the pointer.

  For example, if the stepping motor is rotated forward and the pointer is rotated in the forward direction and then the stepping motor is reversed, for example, if the rotation is not reversed for 10 to 30 steps, the play between the gears is not filled and the pointer remains stopped. become. Then, after the play between the gears is filled, the pointer finally starts rotating in the opposite direction.

  Further, as a conventional technique related to the present invention, Patent Document 1 discloses a technique of an electronic timepiece in which backlash between gears is eliminated by adding an elastic member. Patent Document 2 discloses a technique for preventing erroneous detection of a hand position due to gear backlash in an electronic timepiece having a mechanism for detecting a hand position by detecting a transmission hole of a gear with a photo interrupter. Has been.

JP 2006-153490 A JP 2009-156787 A

  In a multi-function electronic timepiece that displays various information using hands, it is necessary to rotate the hands clockwise or counterclockwise to stop them at desired positions. In this case, it is difficult to realize such an operation unless the total amount of backlash from the stepping motor to the pointer is known.

  In addition, the total backlash amount from the stepping motor to the pointer varies from individual to individual even in the same model due to variations in the manufacturing of gears.

  SUMMARY OF THE INVENTION An object of the present invention is an electronic timepiece in which a pointer is driven by a stepping motor, and an electronic timepiece capable of measuring the backlash amount of a gear train mechanism by itself without giving the information from the outside, and the backlash. It is to provide a quantity setting method.

The present invention
The first guideline,
A first stepping motor for driving the first pointer;
A first gear train mechanism in which a plurality of gears are connected to transmit the rotational motion of the first stepping motor to the first pointer;
A first pointer gear to which the first pointer is fixed among the gears of the first gear train mechanism;
A first detected portion provided on the first pointer gear and detectable by light irradiation;
Detecting means for detecting the presence or absence of the first detected portion by irradiating light to a detection position through which the first detected portion of the first pointer gear passes ;
A second pointer gear to which a pointer other than the first pointer is fixed;
A second detected portion provided on the second pointer gear and capable of being detected by light irradiation by the detecting means;
The play amount from the first stepping motor to the first pointer gear in the first gear train mechanism is rotated by rotating the first stepping motor forward and reverse while causing the detection means to perform a detection operation. Backlash amount measurement control means for measuring,
Backlash amount storage means for storing the play amount data measured by the backlash amount measurement control means;
Equipped with a,
The backlash amount measurement control means includes
The first detecting portion provided on the first pointer gear and the second detected portion provided on the second pointer gear are overlapped with the detection position, and the detection means performs the detection operation while performing the detection operation. The first stepping motor is rotated in the forward direction to determine the change in the detection result of the first detected portion, and then the first stepping motor is rotated in the reverse direction while performing the detection operation of the detecting means. The rotation amount of the first stepping motor is counted until a reverse change in the detection result of the detected portion is determined, and the first stepping motor to the first pointer gear is counted based on the counting result. An electronic timepiece characterized by calculating a play amount of a train wheel mechanism .

  According to the present invention, the play amount of the first gear train mechanism from the first stepping motor to the first pointer can be measured, and the play amount data can be stored. Therefore, there is an effect that it is possible to realize control for rotating the first pointer in the forward direction or the reverse direction and moving it to a desired position using the play amount data.

1 is a block diagram illustrating an overall configuration of an electronic timepiece according to an embodiment of the present invention. It is sectional drawing which shows the part of the gearwheel with which the pointer was fixed. It is a front view which shows the wheel train mechanism which rotates a second hand. It is a front view which shows the wheel train mechanism which rotates a minute hand. It is a front view which shows the wheel train mechanism which rotates an hour hand. It is a front view which shows the wheel train mechanism which rotates a function needle | hook. It is a flowchart which shows the control procedure of the backlash setting process performed by CPU. The movement of the pointer during the backlash setting process will be described, and (a) to (c) are diagrams of the first to third stages.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the overall configuration of an electronic timepiece according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a gear portion to which a pointer is fixed.

  As shown in FIG. 1, the electronic timepiece 1 includes a CPU (central processing unit) 10 that performs overall control of the timepiece, and a plurality of hands 2 to 5 (second hand 2, minute hand 3, hour hand 4, function hand 5). ; See FIG. 2), a movement 30 for driving the hands 2 to 5, a first detection unit 31 for detecting the position of the second hand 2 and the minute hand 3, and a first for detecting the position of the hour hand 4. 2 detection unit 32, a third detection unit 33 for detecting the position of the functional hand 5, a RAM (Random Access Memory) 37 that provides a working memory area to the CPU 10, and a control program and control executed by the CPU 10 A ROM (Read Only Memory) 36 in which data is stored, an EEPROM (Electrically Erasable Programmable ROM) 35 in which control data is stored, a power supply unit 40 for supplying an operating voltage to each unit, and a standard radio wave for time correction Receiving antenna 41 and And a detection circuit 42, an oscillation circuit 38 and a frequency dividing circuit 39 for supplying a signal of a predetermined frequency to the CPU 10, an illumination unit 43 and an illumination drive circuit 44 for illuminating the analog display unit in the dark, and an alarm output. A speaker 45, a buzzer circuit 46, an operation unit 47 having a plurality of operation buttons and inputting an operation command from the outside are provided.

  The movement 30 includes a first motor 51 that drives the second hand 2, a second motor 52 that drives the minute hand 3, a third motor 53 that drives the hour hand 4, and a fourth motor 54 that drives the functional hand 5. Is provided. These first to fourth motors 51 to 54 are stepping motors each having a two-pole stator and a two-pole rotor, and can be driven forward and reverse by changing the waveform of the output drive pulse. Has been.

  Further, the movement 30 is provided with a gear train mechanism 20 that transmits the rotational motion of the first to fourth motors 51 to 54 to the hands 2 to 5. As shown in FIG. 2, a second hand wheel 24 to which the second hand 2 is fixed through a second hand shaft 24a and a minute hand 3 through a minute hand shaft 25a are fixed to the train wheel mechanism 20 as a plurality of pointer gears. The minute hand wheel 25, the hour hand wheel 27 to which the hour hand 4 is fixed via the hour hand shaft 27a, and the function hand wheel 28 to which the functional hand 5 is fixed via the function hand shaft 28a are included. The second hand wheel 24, the minute hand wheel 25, the hour hand wheel 27, and the function hand wheel 28 can be independently rotated by the driving force of the first to fourth motors 51 to 54 around the same rotation shaft. ing.

  Although not particularly limited, in this embodiment, the second hand 2 and the second hand wheel 24 are rotated by 60 steps of rotation of the first motor 51, and the minute hand 3 and the minute hand wheel 25 are rotated by 360 steps of the second motor 52. The wheel train mechanism is such that the hour hand 4 and the hour hand wheel 27 are turned around by 360 step rotation of the third motor 53, and the function hand 5 and the function hand wheel 28 are turned around by 360 step rotation of the fourth motor 54. 20 is designed.

  As shown in FIG. 2, the first detection unit 31 irradiates the detection position P from one side with the second hand wheel 24, the minute hand wheel 25, the intermediate wheel 26, the hour hand wheel 27, and the function hand wheel 28 interposed therebetween. And a light sensor 312 that receives the light transmitted through the detection position P on the other side. The light emitting unit 311 is configured by, for example, a light emitting diode, and the optical sensor 312 is configured by, for example, a phototransistor. The light emitting unit 311 and the optical sensor 312 are fixed to the frame of the housing of the electronic timepiece 1 so as to face each other at a preset detection position P.

  The second detection unit 32 detects the position of the hour hand 4 by detecting the transmission hole 217 h of the detection wheel 217 (see FIG. 5) that rotates in conjunction with the hour hand 4, and similarly to the first detection unit 31. The light emitting unit and the optical sensor are configured to be opposed to each other at the second detection position P2 (see FIG. 5).

  The third detection unit 33 detects the position of the functional needle 5 by detecting the transmission hole 222h of the detection wheel 222 (see FIG. 6) that rotates in conjunction with the functional needle 5, Similarly, it is composed of a light emitting unit and an optical sensor, and is provided in a state of facing each other at the third detection position P3 (see FIG. 6).

  The ROM 36 drives the first to fourth motors 51 to 54 at appropriate timing while counting the signals sent from the frequency dividing circuit 39, thereby moving the hands 2 to 4 and displaying the time. A processing program and an additional function processing program for displaying various information other than the time by moving the hands 2 to 5 in various ways are stored. In addition, a needle position detection processing program for checking whether there is any positional deviation in each of the hands 2 to 5 at a predetermined time and correcting the positional deviation is stored. Further, the backlash amount setting processing program 36a for measuring the backlash amount of the hour hand 4 and storing the data in the EEPROM 35, or the functional hand 5 for measuring the backlash amount of the functional hand 5 and storing the data in the EEPROM 35. Stores a backlash amount setting processing program.

  The EEPROM 35 is provided with a storage area 35a in which backlash amount data representing the backlash amount of the hour hand 4 and the function hand 5 is set as backlash amount storage means. The backlash amount of the hour hand 4 is the play between the gears of the gear train mechanism 20 when the third motor 53 is rotated forward and the hour hand 4 is rotated clockwise and then the third motor 53 is rotated backward. Thus, the movement of the third motor 53 is not transmitted to the hour hand 4 and represents the number of driving steps of the third motor 53 in which the hour hand 4 remains stopped. The backlash amount of the functional needle 5 is the same.

  3 to 6 are front views showing a gear train mechanism for rotating the hands 2 to 5, respectively. In these figures, the teeth formed on each gear are omitted.

  As shown in FIG. 3, the second hand wheel 24 is connected to the rotor 51 a of the first motor 51 via the fifth wheel & pinion 211. In the second hand wheel 24, a plurality of transmission holes (detected portions) 24h1 to 24h7 are formed at radial positions overlapping the detection position P, and the transmission hole 24h1 overlaps the detection position P when the second hand 2 is at the 0 second position. It is assembled as follows.

  As shown in FIG. 4, the minute hand wheel 25 is connected to the rotor 52 a of the second motor 52 via the intermediate wheel 26 and the second wheel 212. Each time the rotor 52a rotates by one step (180 °), the intermediate wheel 26 rotates by 30 ° and the minute hand wheel 25 rotates by 1 °. The minute hand wheel 25 is formed with a transmission hole (detected portion) 25h at a radial position overlapping with the detection position P, and the intermediate wheel 26 is formed with a transmission hole (detected portion) 26h at a radial position overlapping with the detection position P. Has been. When the minute hand 3 is at the 55 minute position, the transmission holes 25h and 26h are assembled so as to overlap the detection position P.

  As shown in FIG. 5, the hour hand wheel 27 is connected to the rotor 53 a of the third motor 53 through three intermediate wheels 213, 215, 216 and a third wheel & pinion 214. The hour hand wheel 27 is formed with twelve transmission holes (detected portions) 27 h at radial positions overlapping the detection position P. Then, when the hour hand 4 is at a position of about 50 minutes to 10 minutes per hour on the dial, any one transmission hole 27h is assembled so as to overlap the detection position P.

  Further, a detection wheel 217 for detecting the position of the hour hand 4 is connected to the wheel train mechanism of the hour hand 4. The detection wheel 217, the intermediate wheel 213, and the third wheel 214 have transmission holes 217 h, 213 h, 214h is formed. These three transmission holes 217h, 213h, and 214h are set to overlap at the second detection position P2 at a specified time for hour hand detection (for example, 11:55, 23:55).

  As shown in FIG. 6, the function hand wheel 28 is connected to the rotor 54 a of the fourth motor 54 through three intermediate wheels 218, 220, 221 and a fourth wheel & pinion 219. The function hand wheel 28 has twelve transmission holes (detected portions) 28 h at radial positions overlapping the detection position P. The function hand 5 is ± 2 from the position of 00 seconds, 05 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, 30 seconds, 35 seconds, 40 seconds, 45 seconds, 50 seconds, 55 seconds on the dial. Any one transmission hole 28h is assembled so as to overlap the detection position P when it is in the range of about seconds.

  Further, a detection wheel 222 for detecting the position of the function needle 5 is connected to the train wheel mechanism of the function needle 5. The detection wheel 222, the intermediate wheel 218, and the fourth wheel 219 are respectively connected to transmission holes 222h, 218h and 219h are formed. These three transmission holes 222h, 218h, and 219h are set so as to overlap at the third detection position P3 when the functional needle 5 comes to a detection position (for example, 00 second position).

  Next, the operation of the electronic timepiece 1 configured as described above will be described.

[Time display & Hand position detection processing]
In the time display mode, the CPU 10 drives the first motor 51 by one step at intervals of 1 second based on a signal having a predetermined period input from the frequency dividing circuit 39, and moves the second motor 52 by 1 step at intervals of 10 seconds. The third motor 53 is driven one step at intervals of 2 minutes. By these controls, the time is displayed by the hands 2-4.

  Further, in parallel with the above-described hand movement processing, the CPU 10 counts a signal of a predetermined period from the frequency dividing circuit 39 to measure the current time, and also sets the first to fourth motors 51 to 54 in one step. Each time the actuator is driven, the position of the hands where the hands 2 to 5 are moved is counted.

  Then, as shown in FIG. 2, at the counting timing at which the transmission holes 27 h, 25 h, 26 h, 24 h 1, and 28 h of the plurality of gears (24 to 28) are overlapped at the detection position P, The light emitting unit 311 is caused to emit light and the sensor output of the optical sensor 312 is confirmed. Then, it is determined whether or not the transmitted light is received, and if there is, it is determined that the minute hand 3 is in a normal position and there is no positional deviation. Subsequently, the first detection unit 31 is caused to perform detection operation every two steps through the first motor 51 being driven for eight steps, and the transmission holes 24h1 and 24h2 of the second hand wheel 24 pass the detection position P. It is determined whether or not the detected pattern is obtained. If this detection pattern is obtained, it is determined that the second hand 2 is in a normal position and there is no positional deviation.

  Further, as shown in FIG. 5, the CPU 10 detects the second detection unit at a counting timing at which the transmission holes 213 h, 214 h, 217 h of the three gears (213, 214, 217) are assumed to overlap at the second detection position P <b> 2. 32 is caused to perform a detection operation. If the overlapping of the transmission holes 213h, 214h, and 217h is detected, it is determined that the hour hand 4 is in a normal position and there is no positional deviation.

  Similarly, as shown in FIG. 6, the CPU 10 performs the third detection at the counting timing at which the transmission holes 218h, 219h, and 222h of the three gears (218, 219, and 222) overlap at the third detection position P3. The unit 33 is caused to perform a detection operation. If the overlapping of the transmission holes 218h, 219h, and 222h is detected, it is determined that the functional needle 5 is in a normal position and there is no positional deviation.

[Backlash amount setting processing]
As shown in FIGS. 5 and 6, since many gears are interposed in the train wheel mechanism of the hour hand 4 and the function hand 5, the amount of backlash between the hour hand 4 and the function hand 5 becomes relatively large. The backlash amount of the hour hand 4 and the backlash amount of the function hand 5 vary from individual to individual even if the electronic timepiece 1 has the same type. Therefore, in the electronic timepiece 1 of this embodiment, these backlash amounts are measured by the following backlash amount setting process, and the data is set in the storage area 35 a of the EEPROM 35.

  The backlash amount data is used to determine the number of driving steps of the third motor 53 and the fourth motor 54 when the hour hand 4 and the function hand 5 are moved in the reverse direction in the additional function processing. . That is, when the hour hand 4 or the function hand 5 is moved while reversing the rotation direction, the number of steps of the backlash amount is added to the number of movement steps of the hour hand 4 or the function hand 5, and the third motor 53 or the fourth motor. 54 is driven. By such control, it is possible to move the hour hand 4 and the function hand 5 to a desired position after filling the play in the connecting portion of the gear.

  This backlash amount setting process is started when a predetermined operation is performed via the operation unit 47, for example, in a setting process before factory shipment or when the electronic timepiece 1 is reset. This backlash amount setting process is started after the plurality of hands 2 to 5 have moved to the specified position for detecting the needle position. The specified position is a position where the transmission holes 27h, 25h, 26h, 24h1, and 28h of the plurality of gears (24 to 28) overlap at the detection position P.

  FIG. 7 is a flowchart of the backlash amount setting process executed by the CPU 10, and FIG. 8 is a diagram illustrating the movement of the hands 2 to 5 during the backlash amount setting process.

  When the backlash amount setting process is started, first, the CPU 10 rotates the third motor 53 forward by one step to rotate the hour hand 4 one step clockwise (step S1). After rotating one step, the CPU 10 causes the first detection unit 31 to perform a detection operation (step S2), and determines whether or not there is an overlap of transmission holes at the detection position P based on the sensor output of the optical sensor 312 (step S2). S3). If the overlapping of the transmission holes is detected, the process returns to step S1.

  At the start of the backlash amount setting process, as shown in FIG. 8A, the second hand 2 and the function hand 5 are at the 00 second position, the minute hand 3 is at the 55 minute position, and the hour hand 4 is at the 11:55 position. The holes 27h, 25h, 26h, 24h1, and 28h are in a state where they overlap the detection position P. Therefore, for a period of time from the start time, it is determined in the determination process of step S3 that there is an overlap of transmission holes, and the loop process of steps S1 to S3 is repeated. Then, by repeating the loop processing of steps S1 to S3 many times, the hour hand 4 moves clockwise, and the transmission hole 27h of the hour hand wheel 27 is gradually removed from the detection position P.

  Then, when the loop processing of steps S1 to S3 is further repeated, as shown in FIG. 8B, the hour hand 4 slightly passes the position of 12:10, for example, and the transmission hole 27h of the hour hand wheel 27 is detected at the detection position P. Deviate from. Then, the light reaching the optical sensor 312 is reduced by the detection operation in step S2, and it is determined in the determination process in step S3 that there is no overlap of the transmission holes. Then, the process goes out of the loop process of steps S1 to S3 and then moves on.

  Next, the CPU 10 reverses the third motor 53 by one step (step S4), and adds “+1” to the hour hand reverse count value of the variable provided in the RAM 37 (step S5). The initial value of the hour hand reverse rotation count value is “0”. Then, the first detection unit 31 performs a detection operation (step S6), and based on the sensor output of the optical sensor 312, it is determined whether or not there is an overlap of transmission holes at the detection position P (step S7). If it is determined that there is no overlap of the transmission holes, the process returns to step S4.

  Even if the third motor 53 is rotated reversely after the hour hand 4 is rotated clockwise, the rotational movement of the third motor 53 is not immediately transmitted to the hour hand wheel 27 due to the backlash of the gear train mechanism 20. Therefore, until the backlash of the train wheel mechanism 20 is clogged to the reverse rotation side and the movement is transmitted to the hour wheel 27, the determination result that there is no overlap of the transmission holes continues in step S7, and in steps S4 to S7. The loop process is repeated.

  Then, while the loop processing of steps S4 to S7 is repeated, the number of times this loop processing is repeated, that is, after the hour hand 4 rotates clockwise, the backlash of the train wheel mechanism 20 is caused by the reverse rotation of the third motor 53. The number of steps of the third motor 53 until the hour hand 4 clogs on the reverse side and the hour hand 4 starts to rotate counterclockwise is counted as a variable (hour hand reverse count value) in the RAM 37.

  Then, as shown in FIGS. 8B to 8C, when the backlash of the train wheel mechanism 20 clogs to the reverse rotation side and the hour hand 4 moves one step counterclockwise, it is determined in step S7 that the transmission hole is It is determined that there is an overlap, and the loop processing of steps S4 to S7 is exited.

  After exiting the loop processing, the CPU 10 calculates the backlash amount from the third motor 53 to the hour hand 4 based on the hour hand reverse rotation count value (step S8). That is, the definition of the backlash amount is the number of driving steps of the third motor 53 until the hour hand 4 is moved in the clockwise direction and then the third motor 53 is rotated in the reverse direction and immediately before the hour hand 4 starts moving in the counterclockwise direction. Then, “1” is subtracted from the above hour hand reverse rotation count value to obtain the backlash amount. Backlash amount measurement control means is constituted by the processing of steps S1 to S8.

  Then, the backlash amount data is stored in the storage area 35a of the EEPROM 35 as backlash amount data for the hour hand 4 (step S9: backlash amount storage step). Then, the backlash amount setting process ends.

  When the backlash amount setting process for the hour hand 4 is completed, the CPU 10 starts the backlash amount setting process for the function hand 5. At the start of processing, the transmission hole 27h of the hour hand wheel 27 is returned to the position where it overlaps the center of the detection position P, and then the fourth motor 54 is driven instead of the third motor 53 to reduce the backlash amount of the functional hand 5. Counting is performed, and the data is stored in the storage area 35 a of the EEPROM 35. The backlash amount setting process for the function hand 5 is substantially the same as the backlash amount setting process for the hour hand 4 in FIG.

  As described above, according to the electronic timepiece 1 of this embodiment, the backlash amount of the hour hand 4 is reduced by rotating the third motor 53 in the normal rotation and the reverse rotation while causing the first detection unit 31 to perform the detection operation. The backlash amount data is measured and stored in the storage area 35a. Similarly, the backlash amount of the functional hand 5 is measured and the data is stored in the storage area 35a. Accordingly, when control is performed to move the hour hand 4 or the function hand 5 counterclockwise to a desired position, the third motor 53 or the fourth motor 54 is reversely rotated based on the backlash amount data. You can get the number.

  Further, according to the electronic timepiece 1 of this embodiment, after the third motor 53 is rotated forward in a state where the other gears do not block the detection position P, the detection result changes from the presence or absence of the overlap of the transmission holes. The number of driving steps of the third motor 53 is counted until the detection result changes from no overlap of the transmission holes to the presence by rotating the third motor 53, and the backlash amount of the hour hand 4 is calculated from the counted value. It has become. Accordingly, the backlash amount of the hour hand 4 can be easily and reliably measured.

  Further, according to the electronic timepiece 1 of this embodiment, the first detection unit 31 and the transmission hole of each gear are provided for use in detecting the hand position, and these are used to measure the backlash amount. Therefore, the number of parts does not increase for measuring the amount of backlash.

  Further, the first detection unit 31 irradiates the detection position with light from one side of the gear, and receives light transmitted through the transmission hole on the other side at the detection position, so that the transmission hole of the gear overlaps the detection position. Therefore, the gear position can be reliably detected.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiment, the hour hand 4 and the function hand 5 that rotate in the center of the dial are exemplified as the pointer for measuring the backlash amount. However, the small hand that rotates in a small window provided in a part of the dial. Can also be targeted.

  Also, the method for counting the amount of backlash is, for example, after the detection of the first detection unit 31 has determined that there is no overlap of the transmission holes, the third motor 53 is further rotated forward by a predetermined step, and then, The backlash amount of the hour hand 4 may be counted by reversing the third motor 53 while performing hour hand reverse counting. As described above, by rotating the hour hand 4 excessively before the third motor 53 is rotated in the reverse direction, the transmission hole 27h of the hour hand wheel 27 is stopped at the limit threshold for determining the presence or absence of the transmission hole. When the hour hand reverse rotation count is performed and the hour hand wheel 27 is not moving, it is determined that there is a transmission hole due to some fluctuation, and an erroneous backlash amount is set.

  In the above-described embodiment, an example in which a transmission hole that transmits light is applied as a detected portion that can be detected by light irradiation. However, the detected portion is configured by a reflective surface and receives reflected light. The detected part may be detected by the above. In addition, the details shown in the embodiments can be appropriately changed without departing from the spirit of the invention.

1 Electronic clock 2 Second hand 3 Minute hand 4 Hour hand (first hand)
5 Function hand 10 CPU
20 Wheel train mechanism 27 Hour hand wheel (first pointer gear)
27h Transmission hole 28 Function needle wheel 28h Transmission hole 31 First detection unit (detection means, needle position detection means)
311 Light Emitting Unit 312 Optical Sensor 35 EEPROM
35a Storage area for backlash data 36 ROM
36a Backlash amount setting processing program 37 RAM
53 Third motor (first stepping motor)
54 Fourth motor P detection position

Claims (4)

The first guideline,
A first stepping motor for driving the first pointer;
A first gear train mechanism in which a plurality of gears are connected to transmit the rotational motion of the first stepping motor to the first pointer;
A first pointer gear to which the first pointer is fixed among the gears of the first gear train mechanism;
A first detected portion provided on the first pointer gear and detectable by light irradiation;
Detecting means for detecting the presence or absence of the first detected portion by irradiating light to a detection position through which the first detected portion of the first pointer gear passes ;
A second pointer gear to which a pointer other than the first pointer is fixed;
A second detected portion provided on the second pointer gear and capable of being detected by light irradiation by the detecting means;
The play amount from the first stepping motor to the first pointer gear in the first gear train mechanism is rotated by rotating the first stepping motor forward and reverse while causing the detection means to perform a detection operation. Backlash amount measurement control means for measuring,
Backlash amount storage means for storing the play amount data measured by the backlash amount measurement control means;
Equipped with a,
The backlash amount measurement control means includes
The first detecting portion provided on the first pointer gear and the second detected portion provided on the second pointer gear are overlapped with the detection position, and the detection means performs the detection operation while performing the detection operation. The first stepping motor is rotated in the forward direction to determine the change in the detection result of the first detected portion, and then the first stepping motor is rotated in the reverse direction while performing the detection operation of the detecting means. The rotation amount of the first stepping motor is counted until a reverse change in the detection result of the detected portion is determined, and the first stepping motor to the first pointer gear is counted based on the counting result. An electronic timepiece characterized by calculating a play amount of a train wheel mechanism . A plurality of pointers including the first pointer;
A plurality of pointer gears including the first pointer gear and to which the plurality of pointers are respectively fixed;
With
A plurality of detected portions that are respectively provided at radial positions overlapping the detection positions of the plurality of pointer gears and can be detected by light irradiation;
In order to detect the position of one or a plurality of hands among the plurality of hands, the detection position is irradiated with light to detect a state in which each detected portion of the plurality of pointer gears is overlapped at the detection position. Needle position detecting means;
With
Electronic timepiece according to claim 1, characterized in that said detecting means for measuring the amount of play is also used as the hand position detection means. The first detected part is a transmission hole that transmits light;
The detection means includes: a light emitting unit that irradiates light to the detection position from one surface side of the first pointer gear; and an optical sensor that detects light transmitted through the detection position on the other surface side of the first pointer gear. 3. The electronic timepiece according to claim 1 , wherein the electronic timepiece is configured. A first wheel train mechanism that transmits a rotational motion of the first stepping motor to the first pointer, the first stepping motor that drives the first pointer, a plurality of gears connected to the first pointer; Of the gears of the first gear train mechanism, a first pointer gear to which the first pointer is fixed, a first detected portion provided on the first pointer gear and detectable by light irradiation, and the first pointer gear Detecting means for detecting the presence or absence of the first detected portion by irradiating light to a detection position through which the first detected portion passes, a second pointer gear to which a pointer other than the first pointer is fixed, A back for setting play amount data representing a play amount of the first gear train mechanism in an electronic timepiece provided with a second detected portion provided on the second pointer gear and detectable by light irradiation by the detecting means. A rush amount setting method,
The play amount from the first stepping motor to the first pointer gear in the first gear train mechanism is rotated by rotating the first stepping motor forward and reverse while causing the detection means to perform a detection operation. Backlash amount measurement control step to measure,
A backlash amount storage step for storing play amount data representing the play amount measured by the backlash amount measurement control step in a storage means ,
The backlash amount measurement control step includes:
The first detecting portion provided on the first pointer gear and the second detected portion provided on the second pointer gear are overlapped with the detection position, and the detection means performs the detection operation while performing the detection operation. The first stepping motor is rotated in the forward direction to determine the change in the detection result of the first detected portion, and then the first stepping motor is rotated in the reverse direction while performing the detection operation of the detecting means. The rotation amount of the first stepping motor is counted until a reverse change in the detection result of the detected portion is determined, and the first stepping motor to the first pointer gear is counted based on the counting result. A backlash amount setting method characterized by calculating a play amount of a train wheel mechanism .

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