JP2013148426A - Electronic watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic watch capable of suppressing increase in a thickness dimension of the watch even in a configuration having a calendar mechanism.SOLUTION: The electronic watch includes: a day wheel having a calendar display function to display calendar information; a day turning intermediate wheel 24 for driving the day wheel; a scoop wheel 28 for rotating an hour hand; a transmission wheel string capable of transmitting driving force from the scoop wheel 28 up to the day turning intermediate wheel 24 and having a detection wheel 25; and a first detection part 6A for detecting rotation of the detection wheel 25 to a reference position. The detection wheel 25 includes a detection target part 251 to be detected in each 24 hours by the first detection part 6A and is arranged on the rear cover side from the day turning intermediate wheel 24 in the thickness direction of the electronic watch. The first detection part 6A is arranged on the rear cover side from the day turning intermediate wheel 24 in the thickness direction of the electronic watch and detects the rotation of the detection wheel 25 up to the reference position by detecting the detection target part 251 moved to a position opposed to the first detection part 6A due to the rotation of the detection wheel 25.

Description

  The present invention relates to an electronic timepiece.

  2. Description of the Related Art Conventionally, an electronic timepiece that automatically corrects a display time based on a standard radio wave or the like is known as a timepiece that displays time by driving a pointer. In such an electronic timepiece, it is necessary to detect the current hand position when the time is corrected. As one of such detection functions, a configuration using an optical sensor is conventionally known (for example, see Patent Document 1).

  The electronic timepiece disclosed in Patent Document 1 has a configuration in which a hole is provided in a part of a gear that drives a pointer, and the hole is detected by an optical sensor, thereby detecting that each pointer is at a predetermined pointer position. It is taken.

JP 2009-264885 A

By the way, there is an electronic timepiece having a date display function for displaying the date in addition to the time display by the hands. An electronic timepiece having such a date display function includes a date wheel for displaying a date, a calendar wheel train having a date indicator for rotating the date wheel, etc. It is provided between the plates.
In such a calendar wheel train, the date wheel and the date indicator driving wheel are arranged closest to the dial plate in the calendar wheel train so that they can be easily seen from the date window opened in the dial plate.
Here, for example, the date wheel is provided with a scale from 1st to 31st, and is driven for one scale in 24 hours. The date driving wheel makes one rotation in 24 hours, and drives the date wheel by one scale per one rotation of the date driving wheel.
In the timepiece having the date display function, whether the hour hand indicates 0 o'clock (12 o'clock) by detecting the position of the date driving wheel, is it corresponding to midnight? It becomes possible to detect whether it corresponds to midnight.

However, when the position of the date indicator driving wheel is detected using an optical sensor as described in Patent Document 1, a hole is provided in a part of the date indicator driving wheel, and the hole is formed on the front side (the dial side) of the date indicator driving wheel. It is necessary to provide an optical sensor for detecting the part. In such a configuration, the thickness dimension of the calendar mechanism disposed between the main plate and the dial is increased by the thickness dimension of the optical sensor and the substrate holding the optical sensor, and the thickness dimension of the electronic timepiece is correspondingly increased. There is also a problem of increasing.
Such a problem also occurs when various calendar mechanisms such as a day wheel other than the date indicator are provided.

  An object of the present invention is to provide an electronic timepiece capable of suppressing an increase in a watch thickness dimension even in a configuration having a calendar mechanism.

  The electronic timepiece of the present invention is an electronic timepiece having a calendar display function, and displays a calendar wheel for displaying calendar information, a driving wheel for driving the calendar wheel, an hour wheel for rotating an hour hand, A transmission wheel train that transmits the driving force to the driving vehicle and has a detection vehicle; a first detection unit that is provided at a position facing the detection vehicle and detects that the detection vehicle has rotated to a reference position; The detection wheel includes a detected portion that is detected every 24 hours by the first detection portion, and is disposed closer to the back cover than the driving wheel in the thickness direction of the electronic timepiece, The one detection unit is disposed at the same height as the driving wheel in the thickness direction of the electronic timepiece or on the back cover side of the driving wheel, and the detection wheel rotates to face the first detection unit. The detected object that has moved to By detecting, and detects that said detection wheel has rotated to the reference position.

In the electronic timepiece of the invention, the first detection unit that detects that the detection wheel has rotated to the reference position is the same height as the driving wheel such as a date-turning wheel in the thickness direction of the electronic timepiece, or behind the driving wheel. It is arranged on the lid side (back side). Further, the first detection unit is provided at a position facing the detection vehicle. In addition, that a 1st detection part and a detection wheel oppose means that it faces each other, without interposing other gears, such as a drive wheel, between them.
Thus, in the electronic timepiece of the present invention, it is not necessary to provide the first detection portion on the dial side (front side) of the driving wheel unlike the conventional electronic timepiece, and the detection wheel positioned on the back cover side of the driving wheel. The first detection unit is provided at a position opposite to. For this reason, a space from the detection vehicle to the height position of the drive vehicle and calendar wheel is provided on the dial side of the detection vehicle, and the first detection unit can be arranged in this space. Therefore, the height position of the upper surface of the first detection unit can be the same as the height position of the driving vehicle or the calendar wheel or on the back cover side, and an increase in the thickness dimension of the calendar mechanism can be prevented. In addition, since the detected part provided in the detection vehicle is detected every 24 hours by the first detecting part, the time indicated by the hour hand corresponds to either morning or afternoon in the electronic timepiece of the invention. It can be detected.
Therefore, according to the electronic timepiece of the present invention, an increase in the watch thickness dimension can be suppressed even in the configuration having the calendar mechanism.
In the electronic timepiece of the invention, since the detection wheel is provided in the transmission wheel train that drives the calendar wheel, it is not necessary to provide a dedicated detection wheel. That is, since the vehicle provided in the transmission wheel train can also be used as a detection vehicle, the number of parts can be reduced and the calendar mechanism can be downsized as compared with the case where a dedicated detection vehicle is provided separately from the transmission wheel train.

  In the electronic timepiece of the invention, the detected part is a through hole penetrating in the thickness direction of the detection wheel, and the first detecting part emits first detection light toward the through hole. And a first light receiving portion that receives the first detection light that has passed through the through hole.

In the electronic timepiece of the invention, the detected part is a through hole, and the first detecting part is an optical sensor using the through hole. Therefore, the timing which detects the reference position of a detection vehicle can be easily set by setting the dimension and shape of a through-hole suitably.
In the electronic timepiece of the invention, one of the first light emitting part and the first light receiving part is arranged on the front side (the dial plate side) of the detection wheel, and the other is arranged on the back cover side of the detection wheel. Even in this case, one of the first light emitting part and the first light receiving part arranged on the front side (the dial side) of the detection wheel is the same height as the driving wheel in the thickness direction of the electronic timepiece or inside the driving wheel. Placed in. Therefore, according to the electronic timepiece of the invention, it is possible to suppress an increase in the thickness of the timepiece even with a configuration employing a transmission type optical sensor.

  In the electronic timepiece of the invention, an hour hand, a minute hand, a second hand, a second wheel for rotating the minute hand, a second wheel for rotating the second hand, a first motor for driving the hour hand and the calendar wheel, A minute hand, the second wheel, the second hand, and a second motor for driving the second wheel, and the hour wheel is disposed closer to the back cover than the driving wheel in the thickness direction of the electronic timepiece, The second wheel and the second wheel are arranged on the back cover side of the hour wheel in the thickness direction of the electronic timepiece, and a second detection unit that detects the position of the hour hand at a position facing the hour wheel. And a third detector for detecting the position of the second hand and the minute hand, the second detector and the third detector are the same height as the driving wheel in the thickness direction of the electronic timepiece, Alternatively, it is arranged on the back cover side of the driving vehicle, The hour wheel has a second through hole that penetrates in the thickness direction of the hour wheel and is detected by the second detection unit, and has twelve third through holes that penetrate in the thickness direction of the hour wheel. The second wheel is formed with one fourth through hole penetrating in the thickness direction of the second wheel, and the second wheel is penetrating one second through the thickness direction of the second wheel. Five through holes are formed, and the second detection unit includes a second light emitting unit that emits second detection light, and a second light receiving unit that receives the second detection light that has passed through the second through hole. The second detection unit receives the second detection light that has passed through the second through-hole that has been moved to a position facing the second detection unit by rotation of the hour wheel. The position of the hour hand is detected, and the third detection unit includes a third light emitting unit that emits third detection light, the second through-hole, and the third through-hole. A third light receiving portion that receives the third detection light that has passed through the hole and the fourth through hole, and the third detection portion is configured to rotate the hour wheel, the second wheel, and the second wheel. When the positions of the third through hole, the fourth through hole, and the fifth through hole are aligned in the thickness direction of the electronic timepiece, the third detection light that has passed through the through holes is received by the third light receiving unit. It is preferable that the position of the second hand and the minute hand is detected by receiving light from the unit.

In the electronic timepiece of the invention, a space from the hour wheel to the height position of the driving wheel or calendar wheel is also provided on the dial side of the hour wheel, and the second detection unit and the third detection unit are arranged in this space. be able to. Therefore, the height position of the upper surface of the second detection unit and the third detection unit can be the same as the height position of the driving wheel or the calendar wheel or on the dial side, and the position of the hour hand, the minute hand and the second hand can be detected. Even with this configuration, it is possible to prevent an increase in the thickness dimension of the calendar mechanism.
In addition, since the positions of the hour hand, the minute hand, and the second hand are detected using the hour wheel, the second wheel, and the second wheel for driving them, it is not necessary to separately provide a dedicated detection wheel. Therefore, the number of parts can be reduced and the calendar mechanism can be miniaturized as compared with the case where a dedicated detection vehicle is provided.

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 disassembled perspective view which shows the sensor board | substrate and circuit board which are arrange | positioned on both sides of the date dial of the said electronic timepiece. FIG. 2 is a plan view schematically showing an enlarged part of the inside of the electronic timepiece. The perspective view which shows the arrangement | positioning relationship of an hour wheel, a 2nd wheel, and a second wheel seeing the hour wheel of the electronic timepiece from the back cover side. 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. The perspective view which shows the arrangement | positioning relationship of the sensor board | substrate of the said electronic timepiece, and a driving wheel train. The side view which shows the arrangement | positioning relationship of the sensor board | substrate of the said electronic timepiece, and a driving wheel train.

An embodiment of the present invention will be described with reference to the drawings.
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.
The electronic timepiece 1 is generally configured by a timepiece main body 10 shown in FIG. 2 and an outer case 16 (see FIG. 1) that accommodates the timepiece main body 10, and is a wristwatch type that a user wears on an arm. Yes. 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 cell (not shown), and uses power generated by the solar cell by charging the secondary battery. A translucent dial 14 is disposed on the front side of the solar cell.

The movement 2 includes a ground plane 20 (see FIG. 2), a sensor board 4 (see FIG. 3), and a circuit board 5 (see FIG. 3). As shown in FIG. 3, the sensor board 4 and the circuit board 5 are arranged with a date wheel 21 inside the electronic timepiece 1 interposed therebetween. As shown in FIGS. 3 and 6, the sensor substrate 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 positions of the gear (detection wheel 25), hour hand 11, minute hand 12, and second hand 13 incorporated in the movement 2. In the present embodiment, the first detection unit 6A is used to detect whether the time indicated by the hour hand 11 corresponds to morning or afternoon. The second detection unit 6B is used to detect the position of the hour hand 11, and the third detection unit 6C is used to detect the positions of the minute hand 12 and the second hand 13. Details of the detection units 6A, 6B, and 6C will be described later.
Since the movement 2 employs a general configuration in which a first motor (not shown), a second motor (not shown) and the like are incorporated in addition to these, the description is simplified. Moreover, since the back cover is also a general structure, description is abbreviate | omitted.

On the dial 14 side of the main plate 20, a date wheel 21 is arranged as shown in FIG. A sensor substrate 4 shown in FIG. 3 is disposed on the inner periphery of the date dial 21. A circuit board 5 is disposed on the back cover side (back side) of the main plate 20 shown in FIG.
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. 4 is a plan view schematically showing an enlarged part of the inside of the timepiece, in which a driving wheel train 22 for driving the date dial 21 is shown.
The driving force for driving the date dial 21 is transmitted from the first motor via the driving wheel train 22. In the present embodiment, as shown in FIGS. 2 to 4, the drive wheel train 22 includes a date indicator driving wheel 23 and a date indicator driving intermediate wheel 24 as a driving vehicle, a detection wheel 25, a second intermediate wheel 26, The intermediate wheel 27 and the hour wheel 28 are included. In the present embodiment, the driving force from the first motor is first transmitted to the hour wheel 28, and in order from the hour wheel 28, the first intermediate wheel 27, the second intermediate wheel 26, the detection wheel 25, the date turning intermediate wheel. 24, the data is transmitted to the date indicator 21 via the date indicator driving wheel 23.

The hour wheel 28 meshes with the gear 271 of the first intermediate wheel 27. As shown in FIGS. 3 and 8, the hour wheel 28 is arranged 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.
The driving force from the first motor is transmitted to the hour wheel 28. 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 drives the hour hand 11 and drives the date wheel 21 via the drive wheel train 22.
Here, when the first motor is driven, the driving force is transmitted in the order of the hour wheel 28, the first intermediate wheel 27, the second intermediate wheel 26, the detection wheel 25, and the date turning intermediate wheel 24. 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.

  FIG. 5 is a perspective view showing the positional relationship between the hour wheel 28, the second wheel 71 and the second wheel 72 when the hour wheel 28 of the electronic timepiece 1 is viewed from the back cover side. As shown in FIG. 5, a second wheel 71 for rotating the minute hand 12 and a second wheel 72 for rotating the second hand 13 are arranged on the back cover side of the hour wheel 28. In the electronic timepiece 1, the hour wheel 28, the second wheel 71, and the second wheel 72 are arranged in this order from the sensor board 4 side between the sensor board 4 and the circuit board 5. The hour wheel 28 has a larger diameter than the second wheel 71 and the second wheel 72. The second wheel 71 and the second wheel 72 are driven by a second motor provided separately from the first motor.

As shown in FIG. 4, the hour wheel 28 is provided with a second through hole 282 for detecting the rotational position of the hour wheel 28. The second through hole 282 also penetrates in the thickness direction of the hour wheel 28 and is detected by the second detection unit 6 </ b> B provided in the sensor board 4 and the circuit board 5. The second through hole 282 is provided at the position where the second wheel 71 and second wheel 71, second wheel 71 and second wheel 72 are aligned when they are viewed in plan with their central axes aligned. It is outside the outer periphery of the car 72.
As shown in FIG. 4, twelve third through holes 283 are formed inside the second through hole 282 of the hour wheel 28. The third through hole 283 also penetrates in the thickness direction of the hour wheel 28. These third through holes 283 are formed at equal angles (30 degrees) with respect to the center of the hour wheel 28 in plan view.
As shown in FIG. 5, the second wheel 71 is formed with a fourth through hole 711 for detecting the rotational position of the second wheel 71, and the fourth through hole 711 is formed on the second wheel 71. It penetrates in the thickness direction. Similarly, as shown in FIG. 5, the second wheel 72 is formed with a fifth through hole 721 for detecting the rotational position of the second wheel 72, and the fifth through hole 721 has a thickness of the second wheel 72. It penetrates in the vertical direction. The third through hole 283, the fourth through hole 711, and the fifth through hole 721 are detected by the third detection unit 6C provided in the sensor board 4 and the circuit board 5.

  The first intermediate wheel 27 meshes with the second intermediate wheel 26 and the hour wheel 28 as shown in FIGS. The first intermediate wheel 27 includes a pinion 272 that meshes with the second intermediate wheel 26 and a gear 271 that meshes with the hour wheel 28. The gear 271 is provided on the back cover side of the kana 272.

  As shown in FIGS. 4 and 6, the second intermediate wheel 26 meshes with the detection wheel 25 and the first intermediate wheel 27. The second intermediate wheel 26 includes a pinion 262 that meshes with the detection wheel 25 and a gear 261 that meshes with the first intermediate wheel 27. The gear 261 is provided on the dial side of the kana 262 and meshes with the kana 272 provided on the dial side of the first intermediate wheel 27.

The detection wheel 25 meshes with the date turning intermediate wheel 24 and the second intermediate wheel 26 as shown in FIGS. Specifically, the detection wheel 25 meshes with a kana 242 provided on the back cover side of the intermediate date wheel 24 and a kana 262 provided on the back cover side of the second intermediate wheel 26. In the present embodiment, the detection wheel 25 is a spur gear. In the present embodiment, the detection wheel 25 is arranged on the inner side of the intermediate date wheel 24 in the thickness direction of the electronic timepiece 1 as shown in FIGS. That is, in the thickness direction of the electronic timepiece 1, a space from the detection wheel 25 to the height position of the intermediate wheel 24 and the date wheel 21 is provided on the dial 14 side (front side) of the detection wheel 25. .
The detection wheel 25 is provided with a detected portion 251 for causing the first detection portion 6A to detect the rotational position of the detection wheel 25. The rotational position of the detection wheel 25 when the detected portion 251 is detected by the first detection portion 6A is set as the reference position of the present invention. As shown in FIG. 4, the detection wheel 25 is provided with two detected portions 251, and the detected portion 251 is a through-hole penetrating in the thickness direction of the detection wheel 25. As shown in FIG. 4, the two detected portions 251 are arranged with the position of the rotation shaft 252 of the detection wheel 25 interposed therebetween. The detected part 251 provided at the reference position is detected by the first detection part 6 </ b> A provided on the sensor board 4 and the circuit board 5.
The detection wheel 25, the first intermediate wheel 27, and the second intermediate wheel 26 constitute the transmission wheel train of the present invention.

The date turning intermediate wheel 24 transmits driving force to the date indicator 21 via the date turning wheel 23. As shown in FIGS. 4 and 6, the date indicator driving intermediate wheel 24 includes a gear 241 that meshes with the date indicator driving wheel 23, and a kana 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. As shown in FIGS. 3 and 6, 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 this embodiment.
In this embodiment, as shown in FIGS. 2 to 4, a Geneva mechanism is configured by the date driving wheel 23 and the date driving intermediate wheel 24.

The sensor substrate 4 is disposed on the inner periphery of the date dial 21. The sensor substrate 4 holds light emitting elements 61A, 62A, and 63A as light emitting parts that constitute the detecting parts 6A, 6B, and 6C. As shown in FIG. 6, 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 date dial 21. The circuit board 5 holds light receiving elements 61B, 62B, and 63B as light receiving parts constituting the detection parts 6A, 6B, and 6C. As shown in FIG. 3, 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, in this embodiment, the watch body 10 includes the first detection unit 6A and the second light emitting element 62A (including the first light emitting element 61A (first light emitting part) and the first light receiving element 61B (first light receiving part). A second detector 6B including a second light emitting part) and a second light receiving element 62B (second light receiving part), and a third light emitting element 63A (third light emitting part) and a third light receiving element 63B (third light receiving part). A total of three detectors, namely a third detector 6C including

First, the first detection unit 6A will be described.
When the sensor board 4 and the circuit board 5 are assembled in the timepiece main body 10, the first detection unit 6 </ b> A is arranged at a position facing the detection wheel 25. That is, the first detection unit 6A and the detection wheel 25 face each other without interposing other gears such as the intermediate wheel 24 and the first intermediate wheel 26 between them. At this time, the first light emitting element 61A is arranged on the dial 14 side (front side) of the detection wheel 25, and the first light receiving element 61B is arranged on the back cover side of the detection wheel 25. The first light emitting element 61A and the first light receiving element 61B are arranged 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 sensor substrate 4 is assembled into the watch body 10, the first light emitting element 61A is disposed in this space as shown in FIGS.

When the detection wheel 25 rotates and the detected portion 251 formed as a through hole moves to a position facing the first light emitting element 61A and the first light receiving element 61B, the first detection emitted from the first light emitting element 61A. The light passes through the through hole and can be received by the first light receiving element 61B. Thus, it can detect that the detection wheel 25 rotated to the reference position by the 1st light receiving element 61B receiving 1st detection light.
In the present embodiment, the detection wheel 25 is rotated once every 48 hours, and the two detected portions 251 are arranged with the position of the rotation shaft 252 of the detection wheel 25 interposed therebetween. Therefore, the reference position of the detection wheel 25 is rotated once every 24 hours to the position of the first light emitting element 61A and the first light receiving element 61B. That is, the first detection unit 6A detects the detected unit 251 every 24 hours. Therefore, if the reference position is set to midnight, when the hour hand 11 is positioned at “0:00”, the reference position is detected by the first light emitting element 61A and the first light receiving element 61B. It can be discriminated whether it is a corresponding one or a one corresponding to midnight. If it is midnight, the first detection light is detected by the first light receiving element 61B, and if it is 0:00 pm, the first detection light cannot pass through the through hole of the detected portion 251 and the first light receiving element 61B. It is because it is not detected.

Next, the second detection unit 6B and the third detection unit 6C will be described.
When the sensor substrate 4 is incorporated in the watch body 10, the second light emitting element 62 </ b> A and the third light emitting element 63 </ b> A are respectively disposed on the dial 14 side (front side) of the hour wheel 28. Further, when the circuit board 5 is incorporated in the timepiece main body 10, the second light receiving element 62 </ b> B and the third light receiving element 63 </ b> B are respectively disposed on the back cover side of the second wheel 72.
The second light emitting element 62A and the second light receiving element 62B are arranged to face each other across the hour wheel 28, the second wheel 71, and the second wheel 72, and the third light emitting element 63A and the third light receiving element 63B are provided. However, they are arranged opposite to each other across the hour wheel 28, second wheel 71, and second wheel 72. 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 second light emitting element 62A and the third light emitting element 63A are arranged in this space.
The second detection unit 6 including the second light emitting element 62A and the second light receiving element 62B detects the second through hole 282. As described above, the position where the second through hole 282 is provided is outside the outer circumference of the center wheel 71 and the second wheel 72. Therefore, if the second detection light passes through the second through hole 282, the second detection light is received by the second light receiving element 62B without being blocked by the second wheel 71 and the second wheel 72.
Since the hour wheel 28 rotates once every 12 hours, the second through hole 282 moves to a position facing the second detection unit 6B every 12 hours. In the present embodiment, the second through-hole 282 is set to be detected at a position where the hour hand 11 indicates 0:00 am and 0:00 pm.

The third detection unit 6C including the third light emitting element 63A and the third light receiving element 63B detects the third through hole 283, the fourth through hole 711, and the fifth through hole 721, and the minute hand 12 and the second hand 13 are predetermined. Used to determine if it is a position.
Since the hour wheel 28 in which the twelve third through holes 283 are formed rotates once every 12 hours as described above, the third through hole 283 is located at a position facing the third detection unit 6C every hour. Come on. Since the second wheel & pinion 71 in which one fourth through hole 711 is formed rotates once every hour, the fourth through hole 711 moves every hour to a position facing the third detection unit 6C. Come on. Since the second wheel 72 in which one fifth through hole 721 is formed rotates once every minute, the fifth through hole 721 moves to a position facing the third detection unit 6C every minute. Come. In the present embodiment, the third through-hole 283, the fourth through-hole 711, and the fifth through-hole 721 move on the hour hand 11 at the hour such as 0:00, 1:00, 2 o'clock, and the minute hand 12 and the second hand 13 Are overlapped when moved to the 0 o'clock position. Therefore, the through holes 283, 711, 721 overlap each other once an hour, and at this time, the third detection light emitted from the third light emitting element 63A passes through the through holes 283, 711, 721, Light is received by the third light receiving element 63B. The rotational positions of the hour wheel 28, the second wheel 71 and the second wheel 72 where the third detection light from the third light emitting element 63A is received are set as the second reference position.

Next, time correction based on detection of each detection part 6A, 6B, 6C in this embodiment is demonstrated.
First, the position of the hour hand 11 is detected by the second detector 6B. In the second detection unit 6B, if the second detection light is emitted once every 12 hours and the hour hand 11 has moved to the 0 o'clock position, the second detection light passes through the second through hole 282.
However, if the position of the hour hand 11 is shifted, the second detection light is not received by the second light receiving element 62B. In this case, the first motor is driven until the second detection light passes, and the position of the hour hand 11 is fast-forwarded and corrected until the second emitted light is received.

  After detecting and correcting the position of the hour hand 11, the detected portion 251 is detected by the first detecting portion 6A, and it is confirmed whether it is midnight or midnight. The first light emitting element 61A emits the first detection light. If the first detection light passes through the through hole of the detected portion 251 and is received by the first light receiving element 61B, the position of the minute hand 12 and the second hand 13 is confirmed. Go to step. On the other hand, when the first detection light is not received by the first light receiving element 61B, the first motor is driven to rotate the detection wheel 25 to a position (reference position) where the first detection light is received. At this time, since the hour wheel 28 also rotates together, the hour hand 11 also rotates for 12 hours and again moves to the 0 o'clock position.

Thereafter, the third through hole 283, the fourth through hole 711, and the fifth through hole 721 are detected by the third detection unit 6C, and the positions of the minute hand 12 and the second hand 13 are confirmed. If the hour hand 11 is moved to the 0 o'clock position and the minute hand 12 and the second hand 13 are moved to the 0 o'clock position, the third detection light emitted from the third light emitting element 63A is transmitted through the through holes 283, 711, 721. And is received by the third light receiving element 63B.
If either the minute hand 12 or the second hand 13 is displaced, the third through hole 283, the fourth through hole 711, and the fifth through hole 721 do not overlap with each other, and the third emitted light is emitted from the third light receiving element. No light is received by 63B. In addition, since the position of the hour hand 11 has been corrected first as described above, the third detection light emitted from the third light emitting element 63A passes through the third through hole 283. In such a case, the second wheel 71 and second are driven by driving the second motor until the third detection light reaches a position where it passes through the third through hole 283, the fourth through hole 711, and the fifth through hole 721. The wheel 72 is rotated to correct the positions of the minute hand 12 and the second hand 13.

The electronic timepiece 1 according to this embodiment described above has the following effects.
According to the electronic timepiece 1, the detection wheel 25 is arranged closer to the back cover than the intermediate date wheel 24, and the date wheel 14 side (front side) of the detection wheel 25 is rotated from the detection wheel 25 to the intermediate date wheel 24 and date. A space up to the height position of the vehicle 21 is provided, and the first light emitting element 61A can be arranged in this space. Therefore, the height position of the upper surface of the first light emitting element 61A can be the same as the height position of the date indicator driving intermediate wheel 24 or the date indicator 21, or can be disposed on the back cover side to prevent an increase in the thickness dimension of the calendar mechanism. it can.
Therefore, according to the electronic timepiece 1, an increase in the watch thickness dimension can be suppressed even in the configuration having the calendar mechanism.

  In the electronic timepiece 1, since the detection wheel 25 is provided in the transmission wheel train that drives the date wheel 21, it is not necessary to provide a dedicated detection wheel. That is, since the vehicle provided in the transmission wheel train can also be used as the detection wheel 25, the number of parts can be reduced and the calendar mechanism can be downsized as compared with the case where a dedicated detection vehicle is provided separately from the transmission wheel train.

In the electronic timepiece 1, a space from the hour wheel 28 to the height of the intermediate wheel 24 or the date wheel 21 is provided between the sensor board 4 and the hour wheel 28 in the thickness direction. . When the sensor substrate 4 is assembled in the watch body 10, the second light emitting element 62A and the third light emitting element 63A are arranged in this space.
Therefore, according to the electronic timepiece 1, even when the position of the hour hand 11, the minute hand 12, and the second hand 13 is detected using the hour wheel 28, the second wheel 71, and the second wheel 72, the thickness of the timepiece increases. Can be suppressed. Furthermore, there is no need to provide a dedicated detection wheel for detecting the positions of the hour hand 11, the minute hand 12, and the second hand 13. Therefore, the number of parts can be reduced and the calendar mechanism can be miniaturized as compared with the case where a dedicated detection vehicle is provided.

  Further, according to the electronic timepiece 1, the first light emitting element 61 </ b> A and the first light receiving element 61 </ b> B are disposed closer to the back cover than the intermediate date wheel 24 in the thickness direction of the electronic timepiece 1. Therefore, the space | interval of the dial 14 and the date dial 21 can also be narrowed. If it does so, the space | interval of the date window 15 of the dial 14 and the date display provided in the date dial 21 will narrow, and the visibility of the date display of the date dial 21 visually recognized from the date window 15 of the dial 14 will improve.

  In the electronic timepiece 1, since the detection wheel 25 is a spur gear, the thickness dimension of the detection wheel 25 can be reduced, and the distance between the sensor board 4 and the detection wheel 25 can be increased. Therefore, according to the electronic timepiece 1, it is easy to secure a space for arranging the first detection unit 6A, and the layout of the first detection unit 6A and the detected unit 251 can be designed flexibly.

  In the electronic timepiece 1, a first motor serving as a power source for driving the hour hand 11 and the date indicator 21 is transmitted via the drive wheel train 22. Therefore, since the torque for driving the date dial 21 is smaller than the torque for driving the date dial with a motor dedicated to the date dial, it is necessary to weaken the elastic force of the date jumper 29. However, according to the electronic timepiece 1, since the Geneva mechanism is configured by the date indicator driving wheel 23 and the date indicator driving intermediate wheel 24, even if the elastic force of the date jumper 29 is weakened, the rattling of the date indicator 21 is This can be prevented by the date driving wheel 23.

[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 first detection unit 6A that detects that the detection wheel 25 is at the reference position uses a transmissive optical sensor including the first light emitting element 61A and the first light receiving element 61B.
In the embodiment, the first light emitting element 61A is disposed on the sensor substrate 4 side and the first light receiving element 61B is disposed on the circuit board 5 side. On the contrary, the first light receiving element 61B is disposed on the sensor substrate 4 side. The first light emitting element 61A may be arranged on the circuit board 5 side. The same applies to the detection unit composed of the other light emitting elements 62A and 63A and the light receiving elements 62B and 63B.

  Moreover, in the said embodiment, although the transmissive | pervious optical sensor comprised by 61 A of 1st light emitting elements and the 1st light receiving element 61B was used, it is not limited to such 1st detection part 6A. For example, a reflection type optical sensor may be used. In the case of using a reflection type optical sensor, a light-reflective detected portion is provided at a reference position on one surface of the detection wheel 25, and a light emitting element and a light receiving element are provided to face the detected portion. At this time, even if the light emitting element and the light receiving element are provided on the sensor board 4 and arranged on the dial side of the detection wheel 25, these elements are formed in a space formed between the sensor board and the detection wheel. Since it is arranged, an increase in the thickness dimension of the electronic timepiece can be suppressed.

  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. Calendar information includes days of the week.

DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 11 ... Hour hand, 12 ... Minute hand, 13 ... Second hand, 14 ... Dial, 21 ... Date wheel (calendar wheel), 23 ... Date driving wheel (driving vehicle), 24 ... Date turning intermediate wheel (driving vehicle) ), 25 ... detection wheel, 251 ... detected part, 28 ... cylinder wheel, 282 ... second through hole, 283 ... third through hole, 6A ... first detection part, 61A ... first light emitting element (first light emitting part) ), 61B: First light receiving element (first light receiving part), 6B: Second detecting part, 62A: Second light emitting element (second light emitting part), 62B: Second light receiving element (second light receiving part), 6C ... Third detection unit, 63A ... third light emitting element (third light emitting unit), 63B ... third light receiving element (third light receiving unit), 71 ... second wheel, 711 ... fourth through hole, 72 ... second wheel, 721 ... the fifth through hole.

Claims (3)

An electronic timepiece having a calendar display function,
A calendar car that displays calendar information;
A driving vehicle for driving the calendar car;
An hour wheel that rotates the hour hand,
A transmission wheel train for transmitting a driving force from the hour wheel to the driving wheel and having a detection wheel;
A first detection unit that is provided at a position facing the detection wheel and detects that the detection wheel has rotated to a reference position;
The detection wheel includes a detected portion that is detected every 24 hours by the first detection portion, and is disposed closer to the back cover than the driving wheel in the thickness direction of the electronic timepiece,
The first detection unit is disposed at the same height as the driving wheel in the thickness direction of the electronic timepiece or on the back cover side of the driving wheel, and the detection wheel rotates to face the first detection unit. An electronic timepiece that detects that the detection wheel has rotated to the reference position by detecting the detected portion that has moved to a position to be detected. The electronic timepiece according to claim 1,
The detected portion is a through-hole penetrating in the thickness direction of the detection wheel,
The first detection unit includes a light emitting unit that emits first detection light toward the through hole, and a light receiving unit that receives the first detection light that has passed through the through hole. clock. The electronic timepiece according to claim 1 or 2,
Hour hand, minute hand, second hand,
A second wheel for rotating the minute hand;
A second wheel for rotating the second hand;
A first motor for driving the hour hand and the calendar wheel;
A second motor for driving the minute hand, the second wheel, the second hand, and the second wheel,
The hour wheel is disposed on the back cover side of the driving wheel in the thickness direction of the electronic timepiece,
The second wheel and the second wheel are arranged on the back cover side of the hour wheel in the thickness direction of the electronic timepiece,
At a position facing the hour wheel, a second detection unit that detects the position of the hour hand and a third detection unit that detects the positions of the second hand and the minute hand are provided,
The second detection unit and the third detection unit are disposed at the same height as the driving wheel in the thickness direction of the electronic timepiece, or on the back cover side of the driving wheel,
The hour wheel includes twelve third through holes that penetrate in the thickness direction of the hour wheel and include second through holes that are detected by the second detection unit. Formed,
The second wheel is formed with one fourth through hole penetrating in the thickness direction of the second wheel,
In the second wheel, one fifth through hole penetrating in the thickness direction of the second wheel is formed,
The second detection unit includes a second light emitting unit that emits second detection light, and a second light receiving unit that receives the second detection light that has passed through the second through hole,
In the second detection unit, the second light receiving unit receives the second detection light that has passed through the second through-hole that has moved to a position facing the second detection unit as the hour wheel rotates. To detect the position of the hour hand,
The third detection unit receives a third light-emitting unit that emits third detection light, and a third light-receiving unit that receives the third detection light that has passed through the second through hole, the third through hole, and the fourth through hole. A light receiving unit,
In the third detection unit, the hour wheel, the second wheel, and the second wheel are rotated, and the positions of the third through hole, the fourth through hole, and the fifth through hole are the thicknesses of the electronic timepiece. An electronic timepiece characterized by detecting the positions of the second hand and the minute hand when the third light receiving unit receives the third detection light that has passed through the through holes when aligned in a direction.

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