JP2923619B2 - Push button type switch board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button type switch plate.

[0002]

2. Description of the Related Art Heretofore, a thin push button type switch plate in which a key top plate having a key top attached thereto is arranged on a switch substrate provided with switch contacts and both are integrated is used.

FIG. 5 is a schematic side sectional view showing a conventional push button type switch plate of this kind. As shown in the figure, this push button type switch plate 70 is formed by printing a desired switch pattern (not shown) on a flexible synthetic resin film 81, and further forming a contact made of an elastic metal plate thereon. On a switch substrate 80 on which a plate 85 is attached to form a switch contact 83, a synthetic resin 94 is molded at a position facing the switch contact 83 of the synthetic resin film 91 via a frame 89 made of a mold resin. And key top 93
And a key top plate 90 formed with.

A chip type light emitting element 87 is mounted on the switch substrate 80, and a sealing resin 88 covers the light emitting element 87.

When the key top 93 is pressed, a switch contact 83 provided on the switch substrate 80 is turned on.

[0006]

However, in the above-mentioned conventional push button type switch plate 70, the switch board 80
There is a problem that a separate component called the frame body 89 is interposed between the key top plate 90 and the key top plate 90, so that the number of components increases accordingly, and the assembling process also increases accordingly, so that cost reduction cannot be achieved. .

The present invention has been made in view of the above points, and an object of the present invention is to provide a push-button switch plate which can reduce the number of parts and can be easily assembled.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a switch substrate having a switch contact formed by forming a desired pattern on a flexible synthetic resin film. A key top plate formed with a key top at a position facing the switch contact of a sheet having a property, and a key top provided on the key top plate by disposing the key top plate on the switch substrate. In a push button type switch plate having a structure for turning on and off a switch contact provided on a switch substrate, a substantially entire outer peripheral portion of the switch substrate is curved upward from a surface of the switch substrate on which the switch contact is provided, and further has a tip side thereof. the curved portion curved outward in a direction in which the surface and the same surface of the switch board provided, joined to the outer peripheral lower surface of the key top plate to the plane of the leading edge of the curved portion, said Pushbutton switch plate, characterized in that the clamping portion is combined <br/> an outer periphery between the case and the base nipped fixed.

[0009]

Since a curved portion is provided on the outer periphery of the switch substrate so that the outer peripheral surface is positioned above the surface of the switch substrate by a predetermined dimension, even if the key top plate is directly mounted on the switch substrate, A predetermined space can be provided between the switch substrate and the key top plate. Therefore, the frame conventionally attached between the switch board and the key top plate becomes unnecessary, the number of parts is reduced, and the assembly can be performed by fixing the switch board and the key top plate, thereby facilitating the assembling work.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing a push button type switch plate 1 according to one embodiment of the present invention, wherein FIG. 1 (a) is a plan view, FIG. 1 (b) is a sectional view taken along line AA of FIG. FIG. 3C is a sectional view taken along line BB of FIG. 3A, and FIG. 3D is a side view.

[0011] As shown in FIG.
Is constructed only by mounting the key top plate 40 on the switch substrate 10. Hereinafter, each component will be described.

FIG. 2 is a diagram showing the switch substrate 10.
FIG. 3A is a plan view, and FIG.
The cross-sectional view is the same as FIG. However, the contact plate 23
2 shows a state before the light emitting element 25 is attached.

As shown in FIG.
Is a film made of synthetic resin having flexibility and thermoplasticity (eg, polyethylene terephthalate film)
Screen printing of a desired pattern 13 on the upper surface of 11,
Further, a shield layer 30 is provided on the entire lower surface of the film 11.

The pattern 13 includes six sets of switch patterns 15 and two sets of light emitting element patterns 17.
These pattern portions 15 and 17 are connected to a drawing pattern 18 of a drawing portion 19 of the film 11.

The shield layer 30 is formed on the entire lower surface of the film 11 by screen printing. The shield layer 30 may be formed by using a film in which a metal layer such as an aluminum foil is laminated as the film 11.

On the other hand, the entire outer peripheral portion of the film 11 is curved substantially vertically upward from the surface on which the switch pattern portion 15 and the like of the film 11 are provided, and the leading edge thereof is flush with the surface of the film 11. As described above, the curved portion 21 which is curved substantially vertically outward is provided.

The curved portion 21 is formed by printing the pattern 13 and the shield layer 30 on the film 11, sandwiching the film 11 in a mold, and applying heat and pressure to deform the thermoplastic film 11 so as to squeeze the film. It is formed.

Then, a contact plate 23 made of a dome-shaped elastic metal plate as shown in FIG. 1 is attached to each of the six sets of switch contact pattern portions 15 of the film 11 with an adhesive tape or the like. Contact 24
Is configured. Light emitting elements 25 as shown in FIG. 1 are respectively mounted on the two sets of light emitting element pattern sections 17 by a conductive adhesive, and a sealing resin 27 is dripped on the light emitting elements 25 to fix and fix them. Sealed.

Next, FIG. 3 is a view showing the key top plate 40, wherein FIG. 3A is a plan view, and FIG.
FIG. 2D is a cross-sectional view, and FIG.

As shown in FIG. 1, the key top plate 40 is constituted by providing six key tops 43 in a synthetic resin film (for example, polyethylene terephthalate film) 41 having flexibility and thermoplasticity. I have.

The formation positions of the key tops 43 are positions facing the respective switch contacts 24 of the switch substrate 10.

The key tops 43 are used to curve the film 41 upward, and at the same time, fill a concave portion formed below the film 41 with the mold resin 44, thereby integrally connecting the curved film 41 and the mold resin 44. It is manufactured by fixing to In the center of the lower surface of the mold resin 44, a pressing projection 45 is provided.

In order to assemble the push button type switch plate 1, as shown in FIG. 1, the key top plate 40 is placed on the switch substrate 10, and the portions near the entire outer periphery of both are joined.
What is necessary is just to fix this joining surface. As a fixing method, for example, ultrasonic welding or an adhesive is used.

At this time, the key top 4 of the key top plate 40
The third pressing projections 45 are in contact with the respective contact plates 23 of the switch substrate 10.

When the key top 43 is pressed, the contact plate 23 is inverted and the switch contact 24 is turned on. When the pressing is released, the switch contact 24 is turned off.

When the film 41 of the key top plate 40 and the mold resin 44 forming the key tops 43 are formed of a translucent material and the light emitting element 25 is turned on, the key tops 43 and the like can be illuminated brightly.

The fixing of the push-button type switch plate 1 to the device is carried out, for example, by sandwiching the upper and lower sides of the fixed outer periphery between the case 51 and the base 53 as shown in FIG.

As described above, since the curved portion 21 is provided on the outer periphery of the switch substrate 10, the outer peripheral surface is positioned a predetermined dimension upward from the surface of the switch substrate 10 on which the switch contacts 24 and the like are provided. Even if the key top plate 40 is directly mounted on the switch substrate 10, a predetermined interval can be provided between the switch substrate 10 and the key top plate 40.

Also, as in this embodiment, the switch substrate 10
By fixing the entire outer peripheral portion of the key top plate 40 and the key top plate 40, the push button type switch plate 1 can have a drip-proof effect.

The shield layer 3 is provided under the switch substrate 10.
The reason why 0 is provided is that, when the switch board 10 is attached to a portable terminal such as a portable radio telephone, the shield layer 30 is grounded, so that the signal is transmitted from the inside of the portable terminal. This is to prevent unnecessary radiation such as radio waves from being emitted to the outside.

The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. The key top plate is not limited to the above-mentioned structure. For example, the key top plate may have a structure in which a hole is formed in a film and a molding resin is formed over and under the hole, or the key top is integrally formed with the rubber sheet in one rubber sheet. May be provided. In short, any structure may be used as long as the key top is formed in a flexible sheet (including a film).

In the above embodiment, the curved portion is provided on the entire outer periphery of the switch substrate. However, the curved portion may be provided on substantially the entire outer periphery of the switch substrate.

[0033]

As described in detail above, according to the push-button switch plate of the present invention, since the curved portion is provided on the outer periphery of the switch substrate, a predetermined space is provided between the conventional switch substrate and the key top plate. This eliminates the need for the frame attached to the switch, reduces the number of parts, and allows the assembly by fixing the switch substrate and the key top plate, thereby facilitating the assembly work and reducing costs. It has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a push button type switch plate 1 according to one embodiment of the present invention.
2A is a plan view, FIG. 2B is a cross-sectional view taken along line AA of FIG. 1A, and FIG.
FIG. 4B is a cross-sectional view, and FIG.

FIG. 2 is a view showing a switch board 10, and FIG.
2 is a plan view, FIG. 2B is a cross-sectional view taken along line CC of FIG. 2A, and FIG. 2C is a rear view.

FIG. 3 is a view showing a key top plate 40, and FIG.
FIG. 1B is a plan view, FIG. 2B is a cross-sectional view taken along line DD of FIG. 1A, and FIG. 1C is a side view.

FIG. 4 is a schematic view showing an example of a method of fixing the push button type switch plate 1;

FIG. 5 is a schematic side sectional view showing a conventional push button type switch plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Push button type switch board 10 Switch board 11 Film 13 Circuit pattern 21 Bending part 24 Switch contact 40 Key top board 41 Film 43 Key top

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 13/10 H01H 13/70

Claims (1)

(57) [Claims] 1. A switch substrate in which a desired pattern is formed on a flexible synthetic resin film to form switch contacts, and a key top is provided on a flexible sheet at a position facing the switch contacts. A push-button switch having a structure in which the key top plate is provided on the switch substrate, and a switch contact provided on the switch substrate is turned on / off by the key top provided on the key top plate. In the plate, the switch board is bent substantially upward from the surface on which the switch contact is provided on the substantially entire outer peripheral portion of the switch board, and the tip side thereof is oriented in the same direction as the surface of the switch board. > a curved portion that is curved outward provided, joined to the outer peripheral lower surface of the key top plate to the plane of the leading edge of the curved portion, the solid by holding the outer periphery of the said junction between the case and the base Pushbutton switch plate, characterized in that the clamping portion.