JP2545449Y2 - Waterproof dial switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof dial switch in a communication terminal device.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view of a principal part showing a conventional example of this type of waterproof dial switch, and FIG. 7 is a plan view of the principal part. In the drawing, 1 is a mounting panel, 2 is a waterproof cover made of a material having excellent flexibility such as silicone rubber or neoprene rubber, and has a key top 3 having a dial number display and a conductive property on the back surface of the key top 3. The rubber contact 4 and the key top 3 are integrally formed with a dome portion 5 for performing a vertical recovery operation and a plate 6 for making the waterproof cover 2 rigid. Here, since the plate 6 needs to be formed integrally with rubber, it is made of metal in consideration of heat during insert molding.

FIG. 8 is a plan view showing the structure of the plate 6, and FIG. 9 is a side view thereof. Plate 6 is waterproof cover 1
The outer dimensions are almost the same except for the thickness of the rubber.
An escape hole 6a is formed concentrically with the key top 3 and larger than the diameter of the base of the dome portion 5, thereby stabilizing the vertical recovery operation of the dome portion 5. 6b is a waterproof cover 2
Holes for attaching to the mounting panel 1 with screws 8, 6
c is a hole for fixing the printed wiring board 7 to the waterproof cover 2 with screws 9.

The printed wiring board 7 has the key top 3
A fixed contact 7a is formed at a position corresponding to the rubber contact 4 formed at the bottom of
It constitutes a switch as a dial.

[0005]

However, according to the prior art having the above-described structure, in order to stabilize the rigidity of the waterproof cover and the up-and-down recovery operation of the key top, a metal formed integrally with the rubber cover is insert-molded. Since the build-up of rubber is indispensable around the sex plate, the thickness of rubber necessary for build-up has been an obstacle to miniaturization.

Also, insert molding, in which a plate is used as an insert and integrally molded with rubber, is different from molding using only rubber, and requires advanced molding techniques and expensive dies, resulting in a decrease in product yield and an increase in equipment investment. No satisfactory products such as productivity and economy could be obtained. In addition, rubber contacts are placed on the back of the key top, and the dome also functions as a waterproof cover, so the thickness of the dome cannot be reduced to a thickness compatible with the vertical recovery operation. Did not reach a level satisfactory as a sensory characteristic.

In view of the above problems, the present invention obtains a configuration in which a waterproof function is not required for the dome around the rubber contact, and reduces the thickness of the dome around the rubber contact to a thickness compatible with the vertical recovery operation. It is an object of the present invention to provide a waterproof dial switch that is thin and has an excellent click feeling when pressing a key top. Another object of the present invention is to obtain a configuration in which the plate and the waterproof cover are provided separately, eliminate the need for a plate thickness for building up the plate, and realize a compact device.

The present invention further provides a structure in which a plate and a waterproof cover are provided separately, thereby minimizing capital investment of a molding die, further simplifying molding technology, and being excellent in economical efficiency and productivity. It is intended to provide a dial switch.

[0009]

In order to achieve the above object, the present invention separates the waterproof cover and the plate without integrally forming them, and divides components into a waterproof function and a switch function. That is, the present invention provides a waterproof dial switch in a communication terminal device, wherein a waterproof cover having a key top, a key top dome portion for performing a vertical recovery operation of the key top, and a concave portion arranged on the back surface of the key top is provided. A plate having an escape hole of the key top and a guide having a guide for enclosing and holding the waterproof cover on one or more opposite sides thereof is disposed on the back of the waterproof cover, A rubber switch sheet having a convex rubber top that fits into the key top back recess of the cover, a rubber top dome part for vertically restoring the rubber top, and a rubber contact arranged on the back of the rubber top. On the back of the plate, a rubber top penetrates the escape hole of the plate, and the key top of the waterproof cover A printed wiring board, which is disposed in a state of being fitted into the rear recess and has fixed contacts corresponding to the rubber contacts of the rubber switch sheet, is disposed on the back of the rubber switch sheet. , A rubber switch sheet and a printed wiring board.

[0010]

According to the above construction, the present invention firstly arranges the waterproof cover on the back of the mounting panel, and arranges the plate on the back of the waterproof cover so as to wrap the waterproof cover with the guide. By fixing the waterproof cover with a three-layer sandwich structure, a waterproof function can be obtained.

Next, a rubber switch sheet is arranged in a state where the rubber top penetrates a relief hole of the plate on the back surface of the plate, and the rubber top is fitted into a concave portion on the back surface of the key top. Then, a printed wiring board having fixed contacts corresponding to rubber contacts on the rubber switch sheet is disposed on the back of the rubber switch sheet, and the rubber switch sheet is sandwiched by the printed wiring board to form the three-layer sandwich structure. , A switching function can be obtained.

Since the rubber top and the key top are fitted to each other, the rubber switch sheet is interlocked with the waterproof cover with a sense of unity. On the other hand, since the rubber switch sheet is divided into a waterproof cover and a function dedicated to the switch function,
No waterproof function is required. Therefore, the rubber top dome portion of the rubber switch sheet can be formed to be thin, and a click characteristic of a preferable level as a sensory characteristic can be obtained.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. In the figure, 21 is a mounting panel, 22 is a waterproof cover, and the waterproof cover 22 is formed of a material having excellent flexibility such as silicone rubber or neoprene rubber, and has a key top 2 having a dial number display.
3. The key top dome portion 24 for the recovery function in the pressing recovery operation of the key top 23 and the concave portion 23a arranged on the key top 23 are integrally formed. The waterproof cover 22 is disposed on the back of the mounting panel 21, and the key top 23 is exposed to the outside through a window 21a of the mounting panel. In this embodiment, the window 21a is a single window, but may be the same as the number of key tops 23. Reference numeral 25 denotes a plate made of metal or plastic so as to have rigidity.
And the waterproof cover 22 is sandwiched by the combination with the mounting panel 21.

FIG. 4 is a plan view showing the structure of the plate 25, and FIG. 5 is a side view thereof. As shown in these figures,
Opposing sides of the plate 25 form one or more pairs of L-shaped guides 25a so that the waterproof cover 22 can be wrapped and held. Reference numeral 25b denotes an escape hole, which is formed at a position corresponding to the key top 23 in the same size as the diameter of the root of the first dome portion 24 in a concentric circle with the key top 23, and functions to support the root portion. The press recovery operation is made stable.

Referring back to FIGS. 1 to 3, reference numeral 26 denotes a rubber switch sheet, which is formed of a material having excellent flexibility such as silicone rubber or neoprene rubber, and fits into a recess of a key top of the waterproof cover 22. It has a rubber top 27 having a convex shape and a rubber top dome 28 for performing a vertical recovery operation of the rubber top 27. Further, a rubber contact 29 having conductivity is formed on the rear surface of the rubber top 27 by being formed integrally with the rubber switch sheet 26. The rubber switch sheet 26 having the above configuration is disposed on the back surface of the plate 25 such that the rubber top 27 penetrates the relief hole 25b of the plate 25.

Here, since the rubber switch sheet 26 is fitted with the rubber top 27 and the concave portion 23a of the key top 23, it works together with the waterproof cover 22 with a sense of unity. Since the function is divided, the waterproof function is not required. Therefore,
Rubber top dome part 28 of rubber switch sheet 26
Can be formed thin, and a click characteristic of a level preferred as a sensory characteristic can be obtained.

Reference numeral 30 denotes a printed wiring board disposed on the back of the rubber switch sheet 26.
In FIG. 2, a fixed contact 30a is formed at a position corresponding to the rubber contact 29 formed on the bottom of the rubber top 23, and a switch as a dial is formed by combining the fixed contact 30a with the rubber contact 29. Reference numeral 25c denotes a mounting panel 2 in which the waterproof cover 22 is combined with the plate 25.
1 is a screw hole for fixing with a screw 31, and 25 d is a screw hole for fixing the rubber switch sheet 26 with the printed wiring board 30 by sandwiching the rubber switch sheet 26 with the screw 32.

With the above configuration, in the present embodiment, first, the waterproof cover 22 is arranged on the back of the mounting panel 21.
A guide 25a is provided on the back of the waterproof cover 22 to cover the waterproof cover 2.
2 is wrapped around the mounting panel 21, the waterproof cover 22 and the plate 25
By fixing the three-layer sandwich structure, a waterproof function is obtained.

Next, a rubber switch sheet 26 is disposed on the back surface of the plate 25 in a state where the rubber top 27 penetrates the relief hole 25b of the plate 25, and the rubber top 27 is fitted into the concave portion 23a on the back surface of the key top 23. Combine. Then, on the back of the rubber switch sheet 26,
A printed wiring board 30 on which fixed contacts 30a corresponding to the rubber contacts 29 on the rubber switch sheet 26 are mounted is disposed.
Is sandwiched and fixed to the three-layer sandwich structure with screws 32 to obtain a switch function.

As described above, the rubber switch sheet 2
6 is a waterproof cover 22 that is dedicated to the switch function.
Work together with the recovery of the key top 23 pressing
In addition, a reliable vertical recovery operation can be performed.

[0021]

As described above in detail, according to the present invention, in a waterproof dial switch in a communication terminal device, a key top, a key top dome portion for vertically restoring the key top, and a key top dome portion and a back surface of the key top are arranged. A waterproof cover having a recessed portion is disposed on the back of a mounting panel having an escape window for the key top, a relief hole for the key top, and a plate having a guide that wraps and holds the waterproof cover on one or more opposite sides, Arranged on the back of the waterproof cover, a convex rubber top that fits into the key top back recess of the waterproof cover, a rubber top dome part for vertically restoring the rubber top, and a back surface of the rubber top A rubber switch sheet having rubber contacts arranged thereon is provided on the back of the plate with a rubber top having a relief hole of the plate. A printed wiring board, which is disposed so as to penetrate and fit into the key top rear recess of the waterproof cover and has fixed contacts corresponding to the rubber contacts of the rubber switch sheet, is disposed on the back of the rubber switch sheet. 5 consisting of a mounting panel, waterproof cover, plate, rubber switch sheet and printed wiring board
Because of the layer structure, the components can be divided into a function dedicated to the waterproof function and a function dedicated to the switch function.

This eliminates the need for a waterproof function on the dome around the rubber contact, ie, the rubber top dome in the present invention, and makes it possible to reduce the thickness of the dome to a thickness compatible with the vertical recovery operation. This has the effect of realizing a waterproof dial switch having an excellent click feeling when pressing the key top. Further, with the above-described configuration, since the plate and the waterproof cover can be provided separately, there is no need for a plate thickness for building up the plate, and there is an effect that the apparatus can be downsized.

Further, since the plate and the waterproof cover can be provided separately, the investment in the molding die can be minimized, the molding technology can be simplified, and the waterproof dial excellent in economy and productivity can be obtained. The effect is to provide a switch.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a front view of the embodiment.

FIG. 4 is a plan view showing the configuration of the plate of the embodiment.

FIG. 5 is a side view showing the configuration of the plate of the embodiment.

FIG. 6 is a side sectional view showing a conventional example.

FIG. 7 is a plan view of the conventional example.

FIG. 8 is a plan view showing a configuration of a plate of the conventional example.

FIG. 9 is a side view showing the configuration of the plate of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Mounting panel 22 Waterproof cover 23 Key top 23a Depression 24 Key top dome part 25 Plate 26 Rubber switch sheet 27 Rubber top 28 Rubber top dome part 29 Rubber contact 30 Printed wiring board 30a Fixed contact

Claims (1)

(57) [Scope of request for utility model registration] 1. A waterproof dial switch for a communication terminal device, comprising: a waterproof cover having a key top, a key top dome portion for vertically restoring the key top, and a concave portion disposed on the back surface of the key top; A plate arranged on the back of a mounting panel having an escape window, an escape hole of the key top, and a guide having a guide that wraps and holds the waterproof cover on one or more opposite sides,
Arranged on the back of the waterproof cover, a convex rubber top that fits into the key top back recess of the waterproof cover, a rubber top dome part for vertically restoring the rubber top, and a back surface of the rubber top A rubber switch sheet having a rubber contact disposed thereon, the rubber switch sheet being disposed in a state in which a rubber top penetrates a relief hole of the plate on the rear surface of the plate and fitted into a key top rear concave portion of the waterproof cover; A printed wiring board equipped with fixed contacts corresponding to the rubber contacts is disposed on the back of the rubber switch sheet, and has a five-layer structure including the above mounting panel, waterproof cover, plate, rubber switch sheet, and printed wiring board. A waterproof dial switch characterized by comprising.