JP5382948B2 - Watch movement - Google Patents

Description

  The present invention relates to a movement of a timepiece provided with a pointer position detecting means.

  The movement that drives the hands of the timepiece has a structure in which a pointer pipe that supports the hands is driven by a motor via a speed reduction mechanism. A circuit board provided with a drive circuit for controlling the motor is mounted on the case body of the movement. The motor is controlled based on a program set in the drive circuit. In particular, the use of radio-controlled timepieces that receive standard time radio waves and correct their display times has become widespread, and the movement of radio-controlled timepieces requires the recognition of the display time, so position detection means that detects the position of the hands Is provided. Patent Documents 1 to 4 disclose a movement that employs a photosensor as position detecting means.

Japanese Patent No. 3328518 JP 2002-107465 A JP 2004-271449 A JP 2006-208181 A

    In recent years, the forms of timepieces have been increasingly diversified, and the movement of the timepiece is also required to be improved in versatility so as to be compatible with various types of timepieces.

  Since the watch case has various shapes and sizes, it is necessary to adopt a movement that is provided inside the case so that its shape and form are suitable for a predetermined case. In actual watch design sites, watches are designed according to the movements used.

  Here, if the mounting position of the circuit board with respect to the case body is fixed, this may be a great design restriction. That is, it may be difficult to secure the space occupied by the circuit board inside the housing. In addition, it is necessary to connect a wiring such as an operation switch or an antenna for receiving a standard time radio wave to the circuit board. Depending on the mounting position of the circuit board with respect to the case body, the connection workability is inferior. In some cases.

  In particular, it is difficult to change the position of the circuit board when a photosensor is used as the position detection means. As a photo sensor, a photo interrupter in which a light emitting unit and a light receiving unit are arranged to face each other, and a photo reflector that reflects light from the light emitting unit and detects the light by the light receiving unit are known. The photo reflector has the advantage that it can be used with single-sided wiring. However, since the light reflecting portion is provided at a predetermined portion of the gear, the gear is a dedicated component. That is, when a photo reflector is mounted on a circuit board, it is necessary to design and use a new gear as the position of the circuit board changes. There is also a problem that the shaking of the gear leads to a decrease in detection accuracy. Furthermore, the reflecting portion is formed by a stamp. Depending on the material of the gear, there are some cases where deformation due to heat occurs or the stamp itself is difficult.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a timepiece movement in which position detection means is more rationally configured.

The invention described in claim 1 of the present application is a motor, a speed reduction mechanism connected to the motor, a pointer pipe for mounting a pointer, a circuit board provided with a drive circuit for controlling the motor, and a position of the pointer In the movement of a timepiece having position detecting means for detecting the case and a case body supporting them,
The case body is a flat type formed by assembling the first case member on the front side and the second case member on the back side in the thickness direction,
The case body accommodates the motor, the speed reduction mechanism, and the proximal end portion of the pointer pipe, and the distal end portion of the pointer pipe projects from the first case member toward the front. ,
The circuit board is attached to one of the first case member and the second case member,
The position detecting means includes a photo reflector provided with a light emitting part and a light receiving part on the circuit board, and a reflecting part for reflecting light from the light emitting part to the light receiving part as the first case member and the second case. Provided on the other side of the member, a light transmitting portion that transmits the light is provided at a base end portion of the speed reduction mechanism or the pointer pipe located between the photo reflector and the reflecting portion ,
The first case member and the second case member are each provided with a boss for positioning the circuit board, a hole for inserting the electrode of the motor, and a mounting portion for mounting the photo reflector or the reflecting portion. The circuit board is a movement of a timepiece having a configuration in which the circuit board can be attached to both the first case member and the second case member .

  According to the present invention, it is possible to obtain a timepiece movement in which the position detection means is configured more rationally.

It is a front view which shows the movement (what mounted | wore with the 2nd case member of the back side) of the timepiece concerning the Example of this invention. It is a side view which shows the movement of a timepiece according to the Example of this invention. It is a back view which shows the movement of the timepiece concerning the Example of this invention. 1 is an exploded perspective view showing a movement of a timepiece according to an embodiment of the present invention. FIG. 6 is a side view showing a timepiece movement (a circuit board mounted on a first case member on the front side) according to an embodiment of the present invention. FIG. 4 is a side view showing a timepiece movement (a circuit board mounted on a first case member on the front side and a second case member on the back side, respectively) according to the embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. The movement 1 of the watch of this example shown in FIGS. 1 to 4 includes a motor 200, a speed reduction mechanism 300 connected to the motor 200, pointer pipes 410 and 420 for mounting the pointer, and a drive circuit for controlling the motor 200. A circuit board 500 having a predetermined shape, a position detection means 600 for detecting the position of the pointer, and a case body 700 for supporting the circuit board 500 are provided, and the pointer pipes 410 and 420 are driven by the motor 200 via the speed reduction mechanism 300. It is the composition to do.

  Specifically, an hour hand pipe 410 for attaching an hour hand and a minute hand pipe 420 for attaching a minute hand are provided concentrically. The speed reduction mechanism 300 connected to the rotor 210 of the stepping motor 200 is connected to the minute hand wheel 421 provided at the proximal end portion of the minute hand pipe 420. Further, the pinion 422 provided at the proximal end portion of the minute hand pipe 420 is connected to the minute wheel 310, and the hour hand wheel 411 provided at the proximal end portion of the hour hand pipe 410 is connected to the pinion 311 of the minute wheel 310. It is connected with. The hour hand pipe 410 and the minute hand pipe 420 are each driven to rotate at a predetermined speed by the stepping motor 200.

  The case body 700 is a flat type formed by assembling the first case member 710 on the front side and the second case member 720 on the back side in the thickness direction. The first case member 710 and the second case member 720 are respectively provided with hooks 711 and locking portions 721 at their main points. The hooks 711 are locked to the locking portions 721 and assembled. The case body 700 houses the base end portions of the motor 200, the speed reduction mechanism 300, and the indicator pipes 410 and 420, and the tip ends of the indicator pipes 410 and 420 face the front from the first case member 710. It protrudes. The first case member 710 is provided with a needle pipe through hole 712 that penetrates the needle pipes 410 and 420. The case body 700 is fixed to the outside by a bolt B1 inserted through the first case member 710 and the second case member 720. Concavities and convexities, bosses, support shafts, and the like for holding the constituent members are formed at the inner surface of the first case member 710 and the second case member 720.

  The circuit board 500 is attached to one of the first case member 710 and the second case member 720 with a bolt B2. In the example shown in FIGS. 1 to 4, the circuit board 500 is mounted on the second case member 720.

  The position detection unit 600 of this example includes a photo reflector 610 including a light emitting unit 611 and a light receiving unit 612 on the circuit board 500, and a reflecting unit 620 that reflects light from the light emitting unit 611 to the light receiving unit 612 in a first case. Provided on the other of the member 710 and the second case member 720, and provided on the base end portion of the speed reduction mechanism 300 or the pointer pipes 410, 420 located between the photo reflector 610 and the reflecting portion 620, a light transmitting portion 630 that transmits light. It will be. In the example shown in FIGS. 1 to 4, the reflecting portion 620 is attached to the first case member 710. The translucent part 630 is provided in the speed reduction mechanism 300, the hour hand wheel 411, and the minute hand wheel 421.

  In the case of this example, the first case member 710 and the second case member 720 include a boss 701 for positioning the circuit board 500, a hole 702 through which the pin-shaped electrode 201 provided in the motor 200 is inserted, and a photo reflector. The circuit board 500 can be attached to either the first case member 710 or the second case member 720, respectively. The end of the electrode 201 of the motor 200 protruding from the hole 702 is soldered to the circuit board 500.

  The reflecting portion 620 in the drawing is a member formed by stamping a plate, and is provided by fitting this into the mounting portion 703. As the reflection portion 620 fitted into the mounting portion 703, a light guide having a predetermined shape that returns light can also be employed.

  In the example shown in FIG. 5, the circuit board 500 is mounted on the first case member 710. The reflection part 620 is attached to the second case member 720. In the example shown in FIG. 6, the circuit board 500 is mounted on the first case member 710 and the second case member 720, respectively. The photo reflector 610 is provided on the circuit board 500 attached to one of the first case member 710 and the second case member 720, and the reflecting portion 620 is provided on the other of the first case member 710 and the second case member 720. Is provided. When the circuit board 500 is provided on both sides as described above, the photo reflector 610 can be replaced with a photo interrupter in which a light emitting portion and a light receiving portion are arranged to face each other. In any example, it is not necessary to change the translucent part 630.

  Thus, the movement 1 of this example can change easily the mounting position of the circuit board 500 with respect to the case body 700. FIG. As the position detection means 600 using the photoreflector 610, a position detection unit formed by forming a reflection portion on a gear is known. Compared to such a position detection means 600, the detection accuracy is excellent, and It is excellent in commonality and versatility.

  In addition, the first case member 710 and the second case member 720 are resin-made injection-molded members. If it is determined that the circuit board 500 is provided on one of them at the molding stage, the core or the like is used. It is also possible to omit the other boss 701, the hole 702, and the mounting portion 703. It can be molded with a common mold, which is advantageous in reducing the size of the case body 700 and improving hermeticity. When the mounting portion 703 is omitted, the reflecting portion 620 may be molded with a stamp at a predetermined site.

  As described above, the movement of this example is configured by more rationally configuring the position detection means. In addition, it is needless to say that the configuration of each part in the present example can be appropriately changed in design within the technical scope described in the claims, and is not limited to that illustrated in the drawings.

  The movement of the timepiece of the present invention can be used very suitably as a unit constituting a time display unit of an analog wall-mounted radio wave correction clock or an alarm radio wave correction clock.

DESCRIPTION OF SYMBOLS 1 Movement 200 Motor 201 Electrode 210 Rotor 300 Deceleration mechanism 310 Sun reverse wheel 311 Kana 410 Hour hand pipe (pointer pipe)
411 hour hand 420 minute hand pipe (pointer pipe)
421 Minute hand wheel 422 Kana 500 Circuit board 600 Position detecting means 610 Photo reflector 611 Light emitting part 612 Light receiving part 620 Reflecting part 630 Translucent part 700 Case body 701 Boss 702 Hole part 703 Mounting part 710 First case member 711 Hook 712 Point pipe penetration Hole 720 Second case member 721 Locking part B1 bolt B2 bolt

Claims (1)

A motor, a speed reduction mechanism connected to the motor, a pointer pipe for mounting the pointer, a circuit board provided with a drive circuit for controlling the motor, a position detection means for detecting the position of the pointer, and supporting them In the movement of a watch with a case body that
The case body is a flat type formed by assembling the first case member on the front side and the second case member on the back side in the thickness direction,
The case body accommodates the motor, the speed reduction mechanism, and the proximal end portion of the pointer pipe, and the distal end portion of the pointer pipe projects from the first case member toward the front. ,
The circuit board is attached to one of the first case member and the second case member,
The position detecting means includes a photo reflector provided with a light emitting part and a light receiving part on the circuit board, and a reflecting part for reflecting light from the light emitting part to the light receiving part as the first case member and the second case. Provided on the other side of the member, a light transmitting portion that transmits the light is provided at a base end portion of the speed reduction mechanism or the pointer pipe located between the photo reflector and the reflecting portion ,
The first case member and the second case member are each provided with a boss for positioning the circuit board, a hole for inserting the electrode of the motor, and a mounting portion for mounting the photo reflector or the reflecting portion. The timepiece movement is characterized in that the circuit board can be attached to either the first case member or the second case member .

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