JPS6134637B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an electronic watch,
The purpose of this is to make the resin movement base that houses the watch movement components such as the circuit board and battery waterproof, thereby simplifying the structure of the watch case and ensuring waterproofness. The object of the present invention is to simplify the manufacturing process, and also to make it possible to integrate the base body and the back cover of the watch case, thereby reducing the thickness and cost of the watch.

Conventionally, waterproof cases have been used for the exterior cases of electronic watches to protect the electronic circuits, etc., and the structure is complicated as it is necessary to incorporate waterproof packing into the windshield, external operation buttons, back cover, etc. Therefore, precision in machining the parts was also required. In addition, in general, the same movement requires exterior cases of various shapes due to the variety of designs, but it is the responsibility of management and management to ensure the waterproofness of each case.
Inspection is time-consuming, and cost reduction has been difficult.

The present invention aims to improve the above drawbacks.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a main part of a liquid crystal display electronic timepiece, and numeral 1 indicates a resin base of a movement made of plastic molding. A necessary wiring pattern is formed on the circuit board 2, and an IC chip 3 and external circuit components not shown on the map are attached thereto. The liquid crystal cell 4 is fixed by screwing the pressing member 5 to the base body 1, and at the same time is electrically connected to the circuit board 2 via the connecting member 6.

Further, the resin base 1 has an opening for storing a battery on the lower side in the figure, and when the battery 7 is stored in the opening and a resin battery cover 8 is assembled, the battery cover 8 is integrally formed with plastic. A plurality of elastic locking claws 8a lock with protrusions 1a formed on the side wall of the opening of the resin base 1 to provide the necessary fixing force, and the battery 7 is fixed. conducts with. Furthermore, when replacing the battery, the battery can be easily replaced by inserting a claw, screwdriver, etc. into the recess 1b of the resin base 1, pressing against the flange 8b of the battery cover 8, and then prying open. Note that a waterproof packing 11 is incorporated between the battery cover 8 and the resin base 1.

By the way, a plurality of external operation buttons 13 are attached to the exterior case 12, and holes provided in the side wall of the resin base 1 corresponding to the buttons 13 are equipped with switch intermediates made of an airtight elastic material such as rubber. A member 14 is inserted in a loose fit that maintains airtightness and allows sliding. Therefore, when the external operation button 13 is pressed, the switch intermediate member 14 slides and is fixed to the resin base 1 by heat caulking. The return spring 15 is bent and brought into contact with the pin 16 implanted in the circuit board 2. Here, one end 15a of the return spring 15 is in pressure contact with the electrode pattern of the circuit board 2, and the pin 16 is also electrically connected to the electrode pattern by soldering or the like, so that the switch is turned on. When the external operation button 13 is released, the restoring force of the return spring 15 causes the switch intermediate member 1 to
4 and button 13 return to their normal positions and the switch is turned off. Therefore, since the waterproofness of the button part is maintained by the switch intermediate member 14, the external operation button 13 does not require waterproofness, and has a simpler structure and fewer parts than the conventional structure. Furthermore, when the operation button 13 receives an external impact, the elasticity of the switch intermediate member 14 absorbs and alleviates the impact, improving impact resistance.

Now, the movement assembled in the resin base 1 is assembled into the outer case 12 together with the waterproof packing 17, and the movement is fixed to the case 12 by attaching the fixing member 18. In this state, the windshield 19 part of the case 12 is attached with waterproof packing 20.
The space between the case 12 and the resin base 1 and the space between the resin base 1 and the battery cover 8 are waterproofed with packings 17 and 11, respectively, and the button part is also waterproofed with a switch intermediate member 14. Therefore, the conventional watch case back cover becomes unnecessary, and the resin base 1 of the movement can be exposed, allowing the watch to be made thinner by the thickness of the back cover. In addition, the exposed resin part has a metallic texture through metal plating, etc., so there is no problem with the design, and in case 1
If 2 is made of plastic, a small and lightweight watch can be provided.

As detailed above, if the watch structure of the present invention is used, waterproofness can be maintained on the side of the watch movement, which has superior processing accuracy and can be mass-produced compared to the outer case, making the waterproofness even more reliable. It has various advantages, such as easier guarantees, a simpler structure of the watch case to reduce costs, and no need for a back cover, which allows it to be made thinner.

In this embodiment, the case of a liquid crystal display electronic timepiece has been described, but it goes without saying that similar effects can be obtained in the case of an LED display or an analog type electronic timepiece.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention. 1...Resin base, 2...Circuit board, 8...Battery cover, 12...Exterior case, 13...Operation button,
14...Switch intermediate member.

Claims (1)

[Claims] 1. It has a function as a back cover and includes a storage area for watch elements such as a circuit board and a display device, and a switch intermediate member that is airtightly attached to a through hole formed in a side wall of the storage area. The resin base is composed of a resin base, and an exterior case equipped with a windshield and an external operation button, and waterproof packing is attached around the upper end of the side wall portion constituting the resin base, and a switch intermediate member attached to the resin base is provided. An electronic timepiece, characterized in that a resin base is airtightly attached to the outer case in a state where the outer case is aligned with an external operation switch.