JPH05153214A - Key structure for telephone set - Google Patents

Abstract

PURPOSE:To provide the key structure of a telephone set which can prevent illumination unevenness and the invasion of static electricity and in which cost can be reduced. CONSTITUTION:Key 6 structure of a telephone set 1 is made in such a way that a rubber switch 4 is provided so that it internally mounts LED 3 provided on a printed board 2, keys 6 provided on a unit main body 5 are arranged on switch parts 41 which are projectingly provided from the rubber switch 4 and light in LED 3 passes through the inner periphery light guidance parts 42 of the switch parts 41 so as to light the keys 6. The light source of LED 3 is diffused at a place near the surface of LED 3 in the inner periphery light guidance parts 42 in the switch parts 41, thin films 43 which prevent the invasion of static electricity are formed, and the inner periphery light guidance parts 42 in the switch parts 41 from the thin films 43 toward the back 61 of the keys is formed in a taper form so that diameters are enlarged toward the back 61 of the keys.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting and static electricity intrusion prevention structure for a telephone whose push button is lit.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a rubber switch c is provided so as to internally house an LED b provided on a printed circuit board a, and a push button e provided on a device body d is provided with a rubber switch c. The push button e is arranged on the switch part f protruding from the switch c, and the light of the LED b passes through the inner light guiding part g of the switch part f.
There is known a telephone h that is designed to light up.

Conventionally, the inner light guiding portion g of the switch portion f is formed in a cylindrical shape so as to directly guide the light of the LEDb to the push button e without diffusing the light of the LEDb, and the light of the LEDb is on the back surface of the push button e. It was designed to irradiate directly.

When the device main body d is curved and the distance between the printed circuit board a and each push button e is different, between the switch part f and the push button e,
A light-reducing plate i having an appropriate thickness is interposed if necessary. This balances the light of the entire push button e.

[0005]

However, in the case of the above-mentioned conventional telephone h, since the light-reducing plate i must be interposed in accordance with the distance between the printed board a and each push button e, the number of parts increases and However, there is a problem that the number of assembling steps is increased and the cost is increased.

Further, the inner peripheral light guide part g of the switch part f is L
Since the light of the EDb is not diffused and is formed into a cylindrical shape so as to be directly guided to the push button e, as shown in FIG. Will occur.

Further, the printed circuit board a provided with the LEDs b has an opening above the LEDs b, and the surface thereof is blocked only by the push button e, so that static electricity easily enters. It causes inconvenience.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a push button structure for a telephone which can prevent illumination unevenness and static electricity from entering and can reduce cost.

[0009]

In the push button structure of a telephone according to the present invention for solving the above problems, a rubber switch is provided so as to house an LED provided on a printed circuit board, and a push button structure is provided on a device body. The push button is arranged on the switch part protruding from the rubber switch, and the inner light guide part of the switch part is led by the LED.
Is a push button of a telephone that is adapted to illuminate the push button by illuminating the LED light source by diffusing the LED light source to a position near the LED surface of the inner light guide section of the switch section. A thin film is formed so as to prevent it, and the inner peripheral light guiding part of the switch part from the thin film to the back surface of the push button is formed in a tapered shape so that the diameter increases as it goes to the back surface of the push button. It is a thing.

[0010]

According to the present invention, the L of the inner light guide section of the switch section is
A thin film is formed in the vicinity of the ED surface, and the inner peripheral light guide section of the switch section from this thin film to the back surface of the push button is formed in a tapered shape such that the diameter is expanded toward the back surface of the push button. Therefore, the light of the LED diffused by the thin film spreads according to the tapered shape of the inner peripheral light guiding portion, and illuminates the back surface of the push button. In addition, the thin film covers the surface of the printed circuit board, which prevents static electricity from entering.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of the overall construction of the telephone 1.
FIG. 2 shows a partial sectional view of the telephone 1.

That is, the telephone 1 is provided with a rubber switch 4 so as to house the LED 3 provided on the printed circuit board 2, and a push button 6 provided on the device body 5 projects from the rubber switch 4. The switch unit 41 is arranged on the switch unit 41 provided so that the light from the LED 3 passes through the inner light guiding unit 42 of the switch unit 41 so that the push button 6 lights up. At a position near the surface of the LED 3 of the circumferential light guide 42,
The thin film 43 is formed, and the inner peripheral light guide portion 42 is tapered.

The printed circuit board 2 is fastened and fixed to the device body 5 with screws (not shown).

The LED 3 has a printed circuit board 2 on the device body 5.
Each push button 6 of the device main body 5 with the device fixed.
It is provided on the printed circuit board 2 so as to be arranged at a position immediately below.

The rubber switch 4 is made of a transparent material, and has a shape in which a plurality of switch portions 41 are projected from a sheet-shaped sheet body 40. The switch portion 41 is provided so as to correspond to the position of each LED 3 of the printed circuit board 2, and each LED of the printed circuit board 2 is in a state where the sheet body 40 is attached to the printed circuit board 2.
3 is covered by the switch unit 41.
The protruding height of the switch portion 41 corresponds to the gap between the push button 6 of the device body 5 and the printed circuit board 2, and the push button 6 and the LED 3 are fixed in the state where the printed circuit board 2 is fixed to the device body 5. The switch section 41 is interposed between the switch and the switch. Further, in this state, the rib 51 provided on the device body 5 allows the seat body 40
Are pressed against the printed circuit board 2.

The switch portion 41 is formed in a cylindrical shape, and at a position near the LED 3 of the inner peripheral light guide portion 42, L
A thin film 43 is formed so as to cover the ED3. Also,
The inner peripheral light guide portion 42 of the switch portion 41 is formed in a tapered shape so that the diameter increases from the thin film 43 toward the push button 6.

That is, according to the telephone 1 having such a structure, as shown in FIG.
Will be spread in. The distance L between the LED 3 and the push button 6, that is, along the tapered inner peripheral light guide portion 42 formed according to the height of the switch portion 41
The light of the ED 3 spreads and is evenly emitted from the back surface 61 of the push button 6. As a result, the surface 62 of the push button 6 has no uneven illumination, and each push button 6 is lit with a balanced light amount.

Further, the seat body 40 of the seat switch 4
And the thin film 43 formed on the switch unit 41,
Since the entire printed circuit board 2 and the LED 3 are covered, static electricity can be prevented from entering the printed circuit board 2 from the outside and a failure due to static electricity can be prevented.

[0020]

As described above, according to the present invention, the light of the LED diffused by the thin film spreads according to the taper shape of the inner peripheral light guide portion and illuminates the back surface of the push button. The push buttons are lit in a well-balanced manner without causing uneven illumination. As a result, it is not necessary to use a light-reducing plate or the like, and it is possible to reduce the number of parts and the cost by reducing the number of assembly steps.

Further, since the surface of the printed board is covered with the thin film and the invasion of static electricity is prevented, the product quality can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of the entire configuration of a telephone.

FIG. 2 is a cross-sectional view of essential parts showing a push button structure of a telephone.

FIG. 3 is a partial plan view and a partial cross-sectional view showing an irradiation state of a push button by an LED.

FIG. 4 is a cross-sectional view of essential parts showing a conventional telephone push button structure.

5A and 5B are a partial plan view and a partial sectional view showing an irradiation state of a push button by an LED in a conventional telephone.

[Explanation of symbols]

 1 Telephone 2 Printed Circuit Board 3 LED 4 Rubber Switch 41 Switch Section 42 Inner Circumference Light Guide Section 43 Thin Film 5 Device Body 6 Push Button 61 Back Side

Claims (1)

[Claims] 1. A rubber switch is provided so as to internally mount an LED provided on a printed circuit board, and a push button provided on a device body is arranged on a switch portion protruding from the rubber switch, A push button structure of a telephone in which light of an LED passes through an inner light guiding portion of the switch portion to light a push button, and the push button structure is provided at a position near the LED surface of the inner light guiding portion of the switch portion. , A thin film is formed so as to diffuse the LED light source and prevent static electricity from entering, and the inner light guide part of the switch part from the thin film to the back surface of the push button expands as it goes to the back surface of the push button. A push button structure for a telephone, which is formed in a tapered shape so as to have a diameter.