JPH07320585A - Multicolor lighting switch - Google Patents

Abstract

PURPOSE:To provide a multicolor lighting switch, capable of lighting in multicolor further to improve sureness of operating a contact opened/closed. CONSTITUTION:In a plurality of bare chips LED23, 23... provided in an upper surface of a substrate 21, a key top 25 is supported approachably/separably relating to the substrate 21 by an elastic body 26. In a lower part of the key top 25, movable contacts 28, provided corresponding to fixed contacts 27 extended in the periphery of the LED23, 23... to open/close the fixed contacts 27, are provided, and a plurality of bare chips LED23, 23... are collectively coated with a seal resin layer 24 of diffusing light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor illuminated switch suitable for use in electronic devices such as mobile phones.

[0002]

2. Description of the Related Art Conventionally, portable electronic devices such as portable telephones are often configured to illuminate a switch operating portion in order to improve the operability of the electronic device even in a dark place. ing. Conventionally, a multicolor illumination switch shown in FIGS. 4 and 5 has been provided as this type of switch operation unit.

In the figure, reference numeral 1 is a substrate, and 2a,
2b, 2c, 2d are circuit conductors, 3 is a movable body, and 4 is a light emitting diode. On the substrate 1, circuit conductors 2a, 2b, 2c, 2d for wiring forming an electronic circuit are formed.
Of the circuit conductors 2a, 2b, 2c, 2d, reference numeral 2a,
2b is a pattern wiring for supplying electric power to the light emitting diodes 4 and 4. These, circuit conductor 2
a and 2b are formed such that their tips are close to each other.
Further, among the circuit conductors 2a, 2b, 2c and 2d, those indicated by reference numerals 2c and 2d form fixed contacts 5 and 5 for switching the electronic circuit. The fixed contacts 5 and 5 are arranged so as to face each other with the circuit conductors 2a and 2b sandwiched therebetween and are equidistantly spaced from the circuit conductors 2a and 2b.

As shown in FIG. 4, the movable body 3 is made of an elastic rubber molded product such as a silicon resin layer, and a thick rectangular prism 6 having a rectangular parallelepiped shape in an outer surface is formed at a substantially central portion thereof. The key top is provided above the square tube portion 6. The rectangular tube portion 6 is arranged such that its length direction is along the fixed contacts 5 and 5. A thin elastic portion 7 extending in a hakama shape is formed on the outer periphery of the rectangular tube portion 6. Further, the fixed contacts 5, 5 are provided on the outer edge of the rectangular tube portion 6.
The movable contacts 8 and 8 are formed corresponding to. Square tube part 6
A through hole 9 is provided at the center of the light emitting diode 4, 4, which is located directly above the light emitting diodes 4, 4, and the key top is illuminated through the through hole 9 by the light emission of the light emitting diodes 4, 4. It has become so. The lower end of the elastic portion 7 reaches the substrate 1 and is fixed to the surface of the substrate 1.

As shown in FIG. 5, the light emitting diodes 4 and 4 are provided with a branched end portion 2e of the circuit conductor 2a.
The circuit conductors 2b and 2b are mounted and fixed on the respective 2f and bonded to the tip portions 2g and 2h of the circuit conductors 2b and 2b by the gold wires 2i and 2i.

In the multicolor illumination switch, when the key top is pushed toward the substrate, the movable contacts 8 and 8 come into contact with the fixed contacts 5 and 5 to form a closed circuit. .

[0007]

By the way, in the case of the above-mentioned multicolor illumination switch, the rectangular tube portion 6 has the through hole 9 formed therein.
Are located immediately above the light emitting diodes 4 and 4, but the light emitting diodes 4 and 4 are arranged side by side along the surface direction of the substrate 1.
At least one or both of the light emitted from No. 4 is polarized at the key top, and when the polarization is large, there is a problem that the illumination of the key top becomes insufficient. Therefore,
In view of the above problems, the number of light emitting diodes mounted in this multicolor illumination switch is limited, and the color types of illumination are limited.

Further, the multi-colored illumination switch has a rectangular tube portion 6
The movable contacts 8 and 8 are brought into contact with the fixed contacts 5 and 5 via the pair of fixed contacts 5 and 5 and the movable contacts 8 and 8 are located at both ends of the rectangular tube portion 6 in the length direction. Therefore, if the pressing force of the key top is biased to either one of the lengthwise directions of the rectangular tube portion 6, the movable contacts 8, 8 push the fixed contacts 5, 5 to one side, which causes switching failure. There is also. Further, a sealed space 10 is formed between the movable body 3 and the substrate 1, and the space 1 is formed when the key top is pressed.
As a result of the increase of the air pressure in 0, there is a problem that the press of the key top is affected and the contact failure between the fixed contacts 5 and 5 and the movable contacts 8 and 8 is caused.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a multicolor illumination switch which enables illumination in more colors and which improves the reliability of the opening / closing operation of the contacts. It is what

[0010]

According to a first aspect of the present invention, there is provided a multicolor illuminated switch in which a substrate, a plurality of bare chip LEDs provided on the upper surface of the substrate, and a plurality of bare chip LEDs spaced apart from the upper surface of the substrate at positions corresponding to the bare chip LEDs are provided. A key top illuminated by the light emission of the bare chip LED, an elastic body interposed between the key top and the substrate to support the key top so that the key top can be moved toward and away from the substrate; In a lower portion of the key switch, the movable switch being provided corresponding to a fixed contact extending around the bare chip LED, and opening and closing the fixed contact by approaching and separating the key top from a substrate, Solution to the above problem that a plurality of bare chip LEDs are collectively covered with a sealing resin layer that diffuses the light emission of the bare chip LEDs. It was the stage.

In the multicolor illumination switch according to the present invention, the fixed contact is formed so as to surround the bare chip LEDs all together, and the movable contact is formed in a substantially ring shape corresponding to the fixed contact. A gap for allowing air to flow is provided inside and outside of the fixed contact and the movable contact as a means for solving the above problems.

[0012]

According to the multicolor illumination switch of the first aspect, the light emitted from the bare chip LED is diffused by the sealing resin layer and the key top is illuminated without being polarized.

According to the multicolor illumination switch of the second aspect, the fixed contact is formed in such a form as to collectively surround the bare chip LEDs, and the movable contact is formed in a substantially ring shape corresponding to the fixed contact. Even when the key tops are unevenly pressed, the movable contact and the fixed contact are surely brought into contact with each other. Also, when the key top is pressed toward the substrate, air flows between the movable contact and the fixed contact through the gap to prevent fluctuation of the air pressure existing between the key contact and the elastic body. Smooth movement is guaranteed,
The opening / closing operation of the contacts is surely performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 20 is a multicolor illumination switch of the present invention, 21 is a substrate, 22a, 22b, 22c,
22d and 22e are circuit conductors, 23 is a bare chip LED,
Reference numeral 24 is a sealing resin layer, 25 is a key top, and 26 is an elastic body. As shown in FIG. 1, the multicolor illumination switch 20
Is a substrate 21, a plurality of bare chip LEDs 23, 23 ... Provided on the upper surface of the substrate 21, and the bare chip L.
A key top 25 is provided at a position corresponding to the EDs 23, 23, away from the upper surface of the substrate 21, and is illuminated by the light emission of the bare chip LEDs 23, 23, and is interposed between the key top 25 and the substrate 21. An elastic body 26 that supports the key top 25 so that it can be moved toward and away from the substrate 21.
And a fixed contact 27 extending around the bare chip LEDs 23, 23 ... Under the key top 25.
And a movable contact 28 that opens and closes the fixed contact 27 by approaching and separating the key top 25 from and away from the substrate 21, and the plurality of bare chip LEDs 23,
23 are collectively covered with a sealing resin layer 24 that diffuses the light emission of the bare chip LEDs 23, 23.

As shown in FIG. 2, among the circuit conductors 22, those denoted by reference numerals 22a, 22b, 22c and 22d are both GND circuits, and their tips are provided close to each other. The circuit conductor 22 indicated by reference numeral 22e is an electric circuit. These circuit conductors 22a, 22b, 22c, 22
The tips of d and 22e are provided close to each other. A land surface L is formed at the tip of the circuit conductor 22e,
A total of four bare chip LEDs 2 are provided on the upper surface of the land surface L.
A COB-LED light source in which 3, 23 ... Are evenly arranged is configured, and further, these four bare chip LEDs 2 are arranged.
A transparent encapsulating resin layer 24 that collectively covers 3, 23 ... Is formed in a hemispherical shape. A diffusion agent that diffuses the light of each bare chip LED 23, 23 ... Is mixed in the sealing resin layer 24. Each of the bare chip LEDs 23, 23 ...
Each of the circuit conductors 22a, 22b, 22c and 22d is bonded with gold wires 29, 29 ...

Circuit conductors 22 indicated by reference numerals 22f and 22g are fixed contacts 27 and 2 for inputting and outputting switching (signal).
Make up 7. The fixed contacts 27, 27 are formed in an arc shape as a whole by arranging the circuit conductors 22f, 22g in parallel with each other. The fixed contacts 27, 27 are arranged in pairs as two pairs so that the bare chip LEDs 23, 23 ... Are installed. A substantially circular area surrounding the area is formed. The circuit conductor 22f has a wide convex portion 22h and a narrow concave portion 22i.
The circuit conductor 22g is formed in a shape having a concave portion 22j corresponding to the convex portion 22h of the circuit conductor 22f and a convex portion 22k corresponding to the concave portion 22i of the circuit conductor 22f. Are these circuit conductors 2
2f and 22g are concave portions and convex portions 22h, 22i and 22 of each other.
It is formed by arranging j and 22k in combination.

As shown in FIG. 1, the elastic body 26 is made of an elastic rubber molded product such as a silicon resin layer, and has a substantially central portion,
The thick cylindrical portion 30 is provided, and the cylindrical portion 3
The key top 25 is arranged on the upper part of 0. On the outer circumference of the cylindrical portion 30, a thin elastic portion 31 extending in a hakama shape is formed. Further, the movable contacts 28, 28 are provided on the outer edge of the cylindrical portion 30 in a substantially ring shape corresponding to the fixed contacts 27, 27 (see FIG. 3). The movable contacts 28, 28 are provided at the tips of the protrusions 33, 33 protruding downward from the cylindrical portion 30, and as shown in FIG. 3, the fixed contacts 27 correspond to the fixed contacts 27, 27. A gap 35 is formed by cutting out the protrusions 33, 33 at a portion corresponding to the gap 34 between the first and the second portions 27, 27. The gap 35 is formed by the circuit conductors 22a, 22.
The circuit conductors 22a, 22b, 22c, 22 are formed at positions corresponding to b, 22c, 22d, 22e, and when the fixed contacts 27, 27 and the movable contacts 28, 28 are brought into contact with each other.
The purpose is to eliminate the step between the conductors 22d and 22e and the circuit conductors 22f and 22g, allow air to flow inside and outside the elastic body 26 due to a change in the internal volume of the elastic body 26, and to avoid a short circuit between the circuit conductors 22e and 22d. It is what The lower end of the elastic portion 31 reaches the substrate 21, and is adhered and fixed to the surface of the resist layer 37 on the surface of the substrate 21.

According to the multi-color illumination switch, when the movable contacts 28, 28 are brought into contact with the fixed contacts 27, 27 by pressing the key top 25 toward the substrate 21, the fixed contacts 27, 27 are removed. The circuit conductors 22f, 22 that constitute
The circuit is closed by energizing between g. When the key top 25 is pressed toward the substrate 21, the volume of the space 38 surrounded by the elastic body 26 and the substrate 21 changes due to the deformation of the elastic portion 31, but the gap 3
Since the air is allowed to flow in and out of the space 38 via the holes 4 and 35, the movable contacts 28 and 28 can be smoothly moved.

Therefore, according to the multicolor illumination switch 20, since the light of the bare chip LED 23 is sufficiently diffused by the diffusing agent mixed in the sealing resin layer 24, the polarization of the key top 25 at the time of illumination is changed. It is canceled and key top 25
Is more reliably and efficiently performed, and moreover, the area in which the bare chip LEDs 23 can be installed is widened and the number of bare chip LEDs 23 to be installed is increased as compared with the conventional one. Therefore, more multicolored illumination can be performed without polarization. Is possible. In addition, the fixed contacts 27, 27 and the movable contact 2
8 and 28 are both provided so as to surround the bare chip LEDs 23, 23, ... And the fixed contacts 27, 27 are formed by combining the circuit conductors 22f, 22g so as to be close to each other, so that the key top 25 is formed. Even if the pressing force of the key is unevenly distributed in any direction, the fixed contacts 27, 27 are brought into contact with the movable contacts 28, 28, and the key top 2
When 5 is pressed, air flows into and out of the space 38 surrounded by the elastic body 26 and the substrate 21 through the gaps 34 and 35, and the movable contacts 28 and 28 move smoothly. Therefore, the pushing of the movable contacts 28, 28 is prevented,
The opening / closing operation of these contacts is surely performed.

In this embodiment, the encapsulating resin layer 24 mixed with the diffusing agent is used. However, the encapsulating resin containing no diffusing agent may be used as long as it can diffuse the light emitted from the bare chip LED 23. Layers may be used. Circuit conductor 22
The number of bare chip LEDs 23 installed on e may be any number other than the above four. The color of the illumination of the key top may change with the pressing of the key top. At this time, the bare chip L mounted on the circuit conductor 22e
Let us say that the EDs 23, 23 ... Emit two or more different colors. Further, the illuminance of illumination may be changed with the pressing of the key top.

[0021]

As described above, according to the multicolor illumination switch of the first aspect, the light of the bare chip LED is sufficiently diffused by the sealing resin layer, so that the polarization at the key top during illumination is prevented. As a result, the area in which the bare chip LEDs can be installed is expanded and a larger number of bare chip LEDs can be installed. As a result, it is possible to illuminate more colors without polarization.

According to the multicolor illumination switch of the second aspect, the fixed contact and the movable contact are both bare chips LE.
In addition to being provided so as to surround D, when the key top is pressed, air flows into and out of the space surrounded by the elastic body and the substrate through the gap, and the movable contact moves. Since the operation is performed smoothly, the movable contacts are prevented from being pushed one-sided and the opening and closing operations of these contacts are surely performed.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a multicolor illumination switch of the present invention.

FIG. 2 is a plan view showing a substrate side of the multicolor illumination switch.

FIG. 3 is a bottom view showing a movable contact provided on an elastic body.

FIG. 4 is a front sectional view showing a conventional multicolor illumination switch.

5 is a perspective view showing a substrate side of the multicolor illumination switch of FIG. 4. FIG.

[Explanation of symbols]

20 ... Multicolor illumination switch, 21 ... Substrate, 23 ... Bare chip LED, 24 ... Sealing resin layer, 25 ... Key top, 26
... elastic body, 27 ... fixed contact, 28 ... movable contact, 34 ... gap, 35 ... gap

Claims (2)

[Claims] 1. A substrate (21), a plurality of bare chip LEDs (23) provided on an upper surface of the substrate (21), and a substrate (2) at a position corresponding to the bare chip LEDs (23).
1) The bare chip LED provided apart from the upper surface
Key tops (25) illuminated by the light emission of (23)
An elastic body (26) interposed between the key top (25) and the substrate (21) for supporting the key top (25) so that the key top (25) can be moved toward and away from the substrate (21); In the lower part of (25), the bare chip LED
A movable contact (28) provided corresponding to a fixed contact (27) extending around (23) and opening and closing the fixed contact (27) by approaching and separating the key top (25) from the substrate (21). ) And a sealing resin layer (2) for diffusing light emission of the bare chip LEDs (23).
4) A multicolor illumination switch characterized by being collectively covered by 4). 2. The multicolor illumination switch according to claim 1, wherein the fixed contact (27) is the bare chip LED (2).
The movable contact (28) is formed so as to enclose 3) all at once.
Is formed in a substantially ring shape corresponding to the fixed contact (27), and at least one of the fixed contact (27) and the movable contact (28) is provided inside and outside of the fixed contact (27) and the movable contact (28). A gap that allows air to flow through (3
4, 35) is provided, and a multicolor illumination switch is provided.