JPS6139341Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a module fixing structure for an electronic timepiece.

Conventionally, modules built into the watch case of electronic watches, such as electronic watches, are equipped with a housing for mounting and holding a circuit board on which electronic components such as LSI are attached, and an elastic piece is attached to the side of this housing. are integrally formed, and the housing is press-fitted into the watch case and fixed by the elastic force of this elastic piece.

However, in the case of the above-mentioned module fixing structure, as watches have become thinner and more compact in recent years, the thickness of the housing has also become thinner, making it difficult to provide sufficient elastic force to the elastic piece. However, the disadvantage was that the housing could not be securely fixed within the watch case. In particular, in the case of synthetic resin watch cases, etc., the inner wall surface of the module storage section is tapered due to mold cutting, and this causes the housing to lift up from inside the watch case, causing the housing to wobble. The disadvantage was that the subsequent assembly work could not be carried out efficiently.

This idea was devised in consideration of the points mentioned above, and its purpose is to create an electronic device that can securely hold the module inside the watch case and allow for efficient assembly work. The object of the present invention is to provide a module fixing structure for a watch.

An embodiment of this invention will be described below based on the drawings. In the figure, reference numeral 1 denotes a housing for a module in a wristwatch, and the housing 1 is made of synthetic resin and has a disk shape, and is housed within a watch case 2 as shown in FIGS. 2 and 3. A circuit board 3 to which electronic components such as LSIs are attached is disposed in the housing 1, and a metal base plate 4 for fixing the circuit board 3 to the housing 1 is attached. On this base plate 4,
A switch spring 5 protruding toward the side of the circuit board 3 and housing 1 is bent. As shown in FIG. 4, the switch spring 5 has a strip shape that is attached to the side surface of the housing 1 and extends in the tangential direction of the housing 1, and has an engaging protrusion (not shown) on the housing 1 at its contact portion. ) is formed to engage with the engagement hole 6. The above switch spring 5 is
When the engagement protrusion of the housing 1 engages with the engagement hole 6, both sides of the housing 1 form a leaf spring that elastically bends around this portion. Further, movable contacts 7, 7 are formed on both sides of the switch spring 5 at the upper portion thereof, and perform a switch operation as the switch spring 5 bends and deforms. The movable contacts 7, 7 have cutout grooves formed on both upper sides of the switch spring 5, and the upper sides of both sides are bent into an arc shape, and this bent arc-shaped portion As the spring 5 bends and deforms, it approaches the side surface of the circuit board 3 and comes into contact with fixed contacts 8, 8 formed on the side surface of the circuit board 3. The fixed contacts 8, 8 are electrically connected to the circuit board 3, and the contact between the movable contacts 7, 7 causes the electronic circuit to perform a predetermined operation. Further, at the lower portions of both sides of the switch spring 5, hook portions 9 are formed to protrude toward the inner wall surface of the watch case 2. The ends of the hooking parts 9, 9 are hooked to a push button switch 10 that is slidably provided on the watch case 2, so that when the module is placed inside the watch case 2, the watch case 2 This is to secure the module so that it does not slip out from inside. In this case, when the push button switch 10 presses the switch main body 10a from the outside of the watch case 2, its tip presses the switch spring 5 to cause it to bend and deform, thereby bringing the movable contact 7 into contact with the fixed contact 8, Furthermore, when the external force is removed, the switch body 10a is pushed back by the elastic force of the switch spring 5. In this case, an E-ring 10b is attached to the inner protrusion of the switch body 10a to prevent the switch body 10a from slipping out of the watch case 2.

Next, a case of assembling the electronic timepiece configured as described above will be described. In this case, first, the circuit board 3 is placed inside the housing 1, and the base plate 4 that presses the circuit board 3 is attached to the housing 1. When the base plate 4 is attached to the housing 1 in this way, the switch spring 5 formed to extend on the base plate 4 is arranged to extend tangentially to the side of the housing 1, and is placed on both upper sides of the switch spring 5. The provided movable contacts 7, 7 correspond to fixed contacts 8, 8 formed on the side surface of the circuit board 3, respectively. Thereafter, the housing 1 to which the base plate 4 and circuit board 3 are attached is inserted into the watch case 2 to which the push button switch 10 is attached in advance.
Then, the switch spring 5 elastically presses the inner tip of the push button switch 10 and acts to push the switch main body 10a to the outside of the watch case 2, and the locking portions 9 formed at the lower sides of the switch spring 5 , 9 hook the lower end of each switch body 10a. Thereby, the module is well fixed without coming up from inside the watch case 2 or wobbling. After this, parts such as the battery 11 are attached to the circuit board 3, and the back cover (not shown) is attached.
Just attach it to the watch case 2.

In this way, according to the module fixing structure of the electronic timepiece, the switch spring 5 formed on the main plate 4
A latching portion 9 for latching the tip of the push button switch 10
When the module is inserted into the watch case 2, the locking part 9 can lock the tip of the push button switch 10, and as a result, the module does not come up from inside the watch case 2. It can be securely fixed inside the watch case 2 without shaking or wobbling. Furthermore, when the hooking portion 9 locks the tip of the push button switch 10 as described above, when the push button switch 10 is pressed, the contact point between the switch spring 5 and the push button switch 10 may shift. Instead, as shown in FIG. 3, the movable contact 7 is able to properly flex and deform, so that the movable contact 7 is in good contact with the fixed contact 8, and the switch operation can be performed reliably.

In the above embodiments, the case of an electronic wristwatch has been described, but the present invention is not limited thereto, and can be applied to other electronic timepieces such as table clocks and alarm clocks.

As explained above, according to the module fixing structure of the electronic watch according to this invention, when the module is inserted into the watch case when assembling the watch, the hook part formed on the switch spring hangs on the tip of the push button switch. As a result, the module can be securely fixed inside the watch case 2 without coming up from the inside of the watch case or shaking inside the watch case, and as a result, the assembly work can be carried out smoothly. be able to. In addition, since the tip of the push-button switch is latched by the latching portion, when the push-button switch presses the switch spring during operation of the push-button switch, the switch spring does not shift and deforms well. There is an advantage that the movable contact can be brought into good contact with the fixed contact, and as a result, the switch operation can be performed reliably.

[Brief explanation of drawings]

Figure 1 is a plan view of the module structure of the electronic watch according to this invention, Figures 2 and 3 show the main parts when the module is installed inside the watch case,
3 is a sectional view of the main part in the normal state, FIG. 3 is a sectional view of the main part in the operating state of the push button switch, and FIG. 4 is an enlarged perspective view of the switch spring. 1...Housing, 2...Watch case, 3...
Circuit board, 4... Ground plate 4, 5... Switch spring,
7...Movable contact, 8...Fixed contact, 9...Latching portion, 10...Push button switch.

Claims (1)

[Scope of utility model registration request] A module comprising a watch case having a through hole in a side wall and a push button slidably attached to the through hole, and a switch spring housed inside the watch case and applying an elastic biasing force to the push button in the outward direction of the case. In the electronic watch, the switch spring is integrally formed with a hook portion that hooks onto the tip of the push button, and when the module is stored inside the watch case, the hook portion of the switch spring is attached to the push button. A module fixing structure for an electronic watch, characterized in that the module is fixed inside the watch case by being hooked to the tip of the watch case.