JPH0879354A - Key board illumination for telephone set - Google Patents

Abstract

PURPOSE: To attain excellent lighting effect by providing a light reflection sheet with a high reflectivity on a rear side of a front case and applying white print to part of a component arrangement face of a printed circuit board to increase the luminance. CONSTITUTION: A light reflection sheet 5 with a high reflectivity is arranged on a rear side of a front case 2, and at least part of a component arrangement side 1a of a printed circuit board 1, that is, a part from the vicinity of of an LED 4 to a lower side of an operation knob 3 has white color print (silk print) to form a white color print layer. The light of the LED 4 is progressed between the white color print layer 6 of the printed circuit board 1 and the light reflection sheet 5 arranged on the rear side of the front case 2 as shown by the arrow F in Fig. being reflected and then the operation section 3a is surely lighted by the light transmitted through the operation knob 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting structure for a keyboard in a telephone, and more particularly to a lighting structure in which a lighting means is arranged on a printed circuit board so as to be located between operation knobs.

[0002]

2. Description of the Related Art There are two types of keyboard illumination structures in conventional telephones, which are shown in FIGS. 4 is a plan view of the keyboard of the telephone, and FIGS. 5 and 6 are shown in FIG.
2 is a cross-sectional view taken along line X-X in FIG. In the figure, 10 is a keyboard of a telephone, 11 is a printed circuit board, 12 is a front case, 13 is a light-transmitting operation knob, and an operation portion 13a is projected from a knob arrangement hole 12a formed in the front case 12. Thus, it is arranged between the front case 12 and the printed circuit board 11. Reference numeral 14 is an LED as a lighting means.

In the form of FIG. 5, the LED 14 is arranged directly below each operation knob 13, and in the form of FIG. 6, the LED 14 is arranged between the operation knobs 13 and 13.
In view of the arrangement space of the operation switch (not shown) and the like, the LED 14 is operated as shown in FIG.
The configuration arranged between 13 is advantageous.

[0003]

However, as shown in FIG. 6, the conventional configuration in which the LED 14 is simply arranged between the operation knobs 13 has a drawback that the illumination efficiency is poor and the brightness is not sufficient. .

The object of the present invention is to eliminate the drawbacks of the conventional configuration shown in FIG. 6 and to secure sufficient brightness even in the configuration in which the illumination means is arranged between the operation knobs, which is excellent in appearance. To provide a lighting structure for a keyboard in a telephone.

[0005]

To achieve the above object, the present invention provides a printed circuit board, a front case, and a space between the front case and the printed circuit board such that an operating portion projects from the front case. In a lighting structure of a keyboard in a telephone, which is provided with a plurality of light-transmitting operation knobs and illumination means arranged on the printed circuit board so as to be located between the operation knobs,
A light reflection sheet having a high reflectance is provided on the back side of the front case, and white printing is performed on at least a part of the component arrangement surface of the printed circuit board.

[0006]

The light of the illuminating means travels while being reflected between the surface of the printed board and the light reflecting sheet on the back side of the front case, and the operating portion is reliably illuminated through the operating knob.

[0007]

1 to 3 show an embodiment of an illumination structure of a keyboard in a telephone according to the present invention, FIG. 1 is an external perspective view of a cordless telephone handset, and FIG. 2 is YY in FIG.
FIG. 3 is a sectional view for explaining the light guide form.

In the figure, A is a cordless telephone handset, 1 is a printed circuit board, 2 is a front case, 3 is a light-transmitting operation knob, and an operation portion 3a is a knob formed on the front case 2. It is arranged between the front case 2 and the printed board 1 so as to project from the arrangement hole 2a. Reference numeral 4 is an LED as a lighting means.

A light reflecting sheet 5 having a high reflectance is arranged on the back side of the front case 2, and at least a part of the component arrangement surface 1a of the printed circuit board 1, that is, the LED 4 is arranged.
A white printing (silk printing) is applied from the vicinity of to the lower surface side of the operation knob 3 to form the white printing layer 6.

As shown in FIG. 3, the light of the LED 4 travels between the white printed layer 6 of the printed board 1 and the light reflecting sheet 5 arranged on the back side of the front case 2 while reflecting as indicated by arrow F. The operation portion 3a is reliably illuminated through the operation knob 3.

[0011]

According to the illumination structure of the keyboard of the telephone of the present invention, the light of the illuminating means advances while reflecting between the white printed layer of the printed board and the light reflecting sheet arranged on the back side of the front case. Since the operation portion of the operation knob is reliably illuminated, even if the illumination means is arranged between the operation knobs, the light of the illumination means can be effectively used, and the brightness is enhanced to exhibit an excellent illumination effect. Can be made.

[Brief description of drawings]

FIG. 1 is an external perspective view of a cordless telephone handset for showing an embodiment of a keyboard illumination structure in a telephone according to the present invention.

FIG. 2 is a sectional view taken along the line YY in FIG. 1 for showing an embodiment of the illumination structure of the keyboard in the telephone according to the present invention.

FIG. 3 is a cross-sectional view for explaining a light guide form.

FIG. 4 is a plan view of a main part showing a keyboard of a telephone.

FIG. 5 is a sectional view showing a lighting structure of a keyboard in a conventional telephone.

FIG. 6 is a cross-sectional view showing another example of a keyboard illumination structure in a conventional telephone.

[Explanation of symbols]

 A cordless telephone handset 1 printed circuit board 1a component placement surface 2 front case 2a knob placement hole 3 operation knob 3a operation unit 4 LED as lighting means 5 light reflection sheet 6 white printing layer

Claims (1)

[Claims] 1. A printed circuit board, a front case, and a plurality of light-transmitting operation knobs arranged between the front case and the printed circuit board so that an operating portion projects from the front case. In a lighting structure of a keyboard in a telephone, comprising: a lighting unit arranged on the printed circuit board so as to be located between operation knobs,
A lighting structure for a keyboard in a telephone, wherein a light-reflecting sheet having a high reflectance is provided on the back side of the front case, and white printing is performed on at least a part of a component placement surface of the printed circuit board.