JPS5923328Y2 - Electronic watch switch mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a switch mechanism in an electronic wristwatch.

Conventionally, in this type of switch mechanism, when the push button is pressed, the inner end contact part of the push button and the thin film contact part, such as copper foil, provided on the peripheral side of the board come into direct contact, and electrically It was conductive.

However, since this contact part is formed of a thin film, the contact part may wear out due to repeated pressing of the push button.
Additionally, if the user accidentally rotates the push button so that the crown is rolled up while the push button is pressed, the contact part may separate from the board, resulting in malfunction of the switch. Ta.

Therefore, it is possible to directly attach a protective member made of a conductive metal plate to the contact part in order to protect the contact part, but since the circuit board of an electronic wristwatch is small and thin, the contact part on the side of the circuit board When attaching the protective member directly to the protector, the attachment work is extremely troublesome.

The present invention was developed in view of the above circumstances, and it is a simple method for installing a conductive protective member to prevent direct contact between the contact part of the push button provided on the side wall of the case of an electronic wristwatch and the contact part on the side surface of the circuit board. The present invention provides a switch mechanism for an electronic wristwatch that can be attached.

An embodiment of the present invention will be explained below with reference to the drawings. In the drawing, 1 is a disk-shaped substrate made of ceramic or the like, and a thin film-like conductor such as copper foil is fired on the upper surface of the substrate 1 and printed. Wiring (not shown) is provided, and a cutout groove 2 having a substantially U-shaped planar shape is bored at one end of the peripheral side thereof.
A contact portion 3 is formed on the inner surface of the notch groove 2 by firing a thin film conductor such as copper foil integrally with the printed wiring portion, and the contact portion 3 is formed in a predetermined position of the printed wiring of the board 1. It is electrically connected to one pole via the wiring.

Further, a push button 4 is attached to the side wall of the watch case body (not shown) so as to be slidable in the direction of the arrow AB in the center of FIG. 1, and unless the push button 4 is pressed in the direction of the arrow B against the elasticity of the spring, the inner contact between the contact portion 3 and the push button 4 will occur. There is a gap between them so that the parts 4a do not come into contact with each other.

Further, the inner end contact portion 4a of the push button 4 is connected to the other pole different from the pole to which the contact portion 3 is connected via the case body.

Furthermore, a frame 5 made of a resin material such as plastic and formed into a disk shape is disposed above the substrate 1, and the frame 5 includes a liquid crystal panel (not shown) on which time, date, etc. are displayed. ) etc. are installed.

In addition, a rectangular fitting groove 6 is bored in the upper surface of the frame 5 in correspondence with the cutout groove 2 of the substrate 1.
An insertion hole 7 penetrating vertically is formed in one end of the fitting groove 6 closer to the circumferential side of the frame 5.

In the figure, 8 is a member that protects the contact portion 3, and is made by bending a conductive plate material into an oval shape on the side, and the upper piece 9, which is the mounting portion, is fitted into the fitting groove 6. , a hanging piece 10 serving as a protection part is formed by bending and extending from the upper piece 9, and the hanging piece 10 is formed to extend from the upper piece 9 through the insertion hole 7.
The tip end is in close contact with the contact portion 3 of the substrate 1 so as to cover the entire contact portion 3.

Further, the board 1 and the frame 5 disposed on the top surface of the board 1 are housed in a case main body to which a push button 4 is attached.

To briefly describe the function of the present invention, the push button 4 is always separated from the hanging piece 10 with a certain gap due to the biasing force of the spring, so that the push button 4 and the contact portion 3 disposed on the substrate 1 However, if the push button 4 is pressed against the spring force, the inner end contact portion 4a of the push button 4 will be connected to the conductive member 8.
Press the hanging piece 10 of the contact part 3 through the hanging piece 10.
Since the push button 4 contacts the case body, the push button 4, the hanging piece 10, and the contact portion 3 are electrically connected to each other.

Therefore, as described above, the inner end contact portion 4a of the push button 4 is connected to the contact portion 3.
There is no direct contact with the push button 4, and there is no possibility of wear of the contact part 3 due to pressing the push button 4, or peeling of the contact part 3 due to the user accidentally rotating the push button 4 while pressing it. Since the contact portion 3 can be reliably connected and separated, and the switch operation can be performed reliably, it can withstand many years of use.

In addition, the member 8 interposed between the push button 4 and the contact portion 3 can be assembled into the frame by simply bending a conductive plate material into a cross-section shape and incorporating it into the fitting groove 6 and insertion hole 7 provided in the frame 5. It can be fixed against 5.

Therefore, the production and assembly process is extremely simple and suitable for mass production.

In the above embodiment, the hanging piece 10 of the member 8 is brought into close contact with the contact part 3, but the invention is not limited to this, and the hanging piece 10 may be made to face the contact part 3 with a predetermined distance therebetween. often,
Further, the shape of the member 8 is not limited to the shape shown in FIG. 1, and other configurations may be changed in various ways without departing from the gist of the present invention.

As described above, the present invention includes a conductive protection member that protects a thin film contact provided on the side surface of a circuit board, and a frame body that is stacked on a circuit board to attach electronic components to the circuit board.
Since the push button is installed so as to be interposed between the inner end contact part and the contact part, and the inner end contact part of the push button and the contact part are electrically connected via the conductive protection member, the contact part Not only does wear and peeling not occur, but the conductive protective member can be attached extremely easily.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an exploded perspective view, and FIG. 2 is a partially cutaway side view of the main parts. 1... Board, 3... Contact part, 4...
...Push button, 10...Drooping piece.

Claims (1)

[Scope of utility model registration request] A push button slidably provided on the side wall of the wristwatch case, a circuit board provided with a thin film contact portion on the side surface opposite to the inner end contact portion of the push button, and the circuit board for attaching electronic components to the circuit board. A switch mechanism for an electronic wristwatch, comprising a frame made of synthetic resin that is laminated on a surface of a substrate, and a conductive protection member that protects the thin film contact portion on the side surface of the circuit board, the switch mechanism comprising: The member includes a mounting portion attached to the frame and a protection portion extending from the mounting portion, and connects the inner end contact portion of the push button and the contact portion through the protection portion of the conductive protection member. The switch mechanism of an electric wristwatch is electrically connected.