JP2002289059A - Portable electronic devices - Google Patents

Abstract

(57) Abstract: In a lighting structure of a portable electronic device, it is possible to prevent light from leaking and to prevent a decrease in light amount. A light source (6) for emitting light from a key (5a) is provided.
Attach the light shielding tape 8 so that only one surface of the light source is opened,
The light-shielding tape has a light reflecting surface on the inner surface and a black outer surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device, and more particularly to an improvement in a light emitting section.

[0002]

2. Description of the Related Art In a portable electronic device such as a mobile phone, a key to be operated is illuminated to improve operability in a dark place or the like so that it can be distinguished from other keys. I have to.

In a conventional key lighting structure, a ridge is formed on a housing (case) so that a wall is formed around a key to be illuminated. The light source is provided on a wiring board, and has a structure in which the ridge surrounds a light source such as an LED when the housing is incorporated. The light source is directly below the key and directly illuminates the key. Further, the projections prevent light from being emitted to unnecessary portions.

In addition, a black tape is attached to a light source except for a necessary part to prevent light from being emitted to an unnecessary part.

[0005]

However, in the above-described conventional key illumination structure, the protrusions and the wiring board do not adhere to each other due to an assembly error, and a slight gap is formed, and light leaks from the gap. . In addition, the thickness of the ridge cannot be too large in structure, and light passes through the ridge. If the ridge is thickened so as not to penetrate, there is a problem that sink occurs at the time of molding the casing and the appearance is impaired. Further, if the light source is located immediately below the key, there is a problem that the operation of the button is obstructed.

When a black tape is applied, there is a problem that light is absorbed by the tape, and the amount of light obtained is reduced.

The present invention has been made in view of the above circumstances, and in a lighting structure of a portable electronic device, it is an object of the present invention to prevent light from leaking and to prevent a decrease in light quantity.

[0008]

According to the present invention, there is provided a light source for emitting a key or the like, a light-shielding tape is attached so that only one surface of the light source is opened, and the light-shielding tape has a light reflecting surface on an inner surface; The present invention relates to a portable electronic device having a black outer surface.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a mobile phone according to the present embodiment, in which a wiring board 3, a display unit 4, and the like are housed in a front case (housing) 1 and a rear case (housing) 2.

A button sheet (not shown) is provided on the back surface of the front case 1, and various keys 5 provided on the button sheet protrude from key holes of the front case 1.

Hereinafter, a case where the key 5a of the keys 5 is illuminated will be described.

A light source, for example, an LED, is located on the wiring board 3 at a position shifted from immediately below the key 5a to the display unit 4 side.
6 is implemented.

On the back surface of the front case 1, the LE
A shielding wall 7 is formed so as to surround D6 (see FIG. 2), and the shielding wall 7 is substantially U-shaped and the key 5a side is open. Thus, when the front case 1 is combined with the rear case 2, it surrounds the three sides of the LED 6.

A light-shielding tape 8 is attached to the wiring board 3 so as to cover the LED 6. The light-shielding tape 8 has a sticking surface (inner surface) which is a light reflecting surface of silver or the like coated with metal or the like, an adhesive layer is formed, and an outer surface is black.

The shape of the light-shielding tape 8 has a convex shape in which unnecessary portions are removed for the purpose of reducing the weight and reducing the area occupied by the wiring board 3.

The LED 6 is disposed at the center of the light-shielding tape 8. The light-shielding tape 8 is adhered to the upper surface of the LED 6 and has a tongue 8a extending to the left and right and a tongue 8b extending to the side opposite to the key 5a. By being bonded to the wiring board 3, the four surfaces of the LED 6 are completely covered,
6, only the key 5a side is opened. still,
Although the gap between the three surfaces except the upper surface of the LED 6 and the light shielding tape 8 is slightly clear, it does not affect the light shielding state.

The key 5a is a transparent resin, for example, a polycarbonate resin. The key 5a is bonded to a translucent material, for example, a rubber sheet 9, and the rubber sheet 9 is
The ED 6 is provided near the open surface.

Hereinafter, the operation will be described.

Part of the light emitted from the LED 6 is the L
The light is reflected directly from the open surface of the ED 6 and the remainder is reflected on the inner surface of the light-shielding tape 8 or inside the LED molding resin.
It is injected from the open surface of the ED 6 toward the rubber sheet 9.

Since the rubber sheet 9 is translucent, the light incident on the rubber sheet 9 is diffused in the rubber sheet 9 and illuminates the key 5a.

As described above, although the gap between the three surfaces except the upper surface of the LED 6 and the light shielding tape 8 is slightly clear, the reflection is repeated because the inner surface of the light shielding tape 8 is a light reflecting surface.
Finally, since the light is emitted from the open surface of the LED 6,
There is no effect on the decrease in light quantity.

Further, the outer surface of the light-shielding tape 8 is black, and there is no light transmitted through the light-shielding tape 8, and the light is completely enclosed by the shielding wall 7, so that light leakage is completely prevented. .

Since the light shielding effect of the light shielding tape 8 is large, the shielding wall 7 can be omitted.
Further, the light-shielding tape 8 may be affixed so as to be in close contact with the four surfaces of the LED 6 except for the front surface and the bottom surface of the LED 6.

[0025]

As described above, according to the present invention, a light source for emitting light from a key or the like is provided, and a light shielding tape is attached so that only one surface of the light source is opened. Yes, since the outer surface is black, light leakage is prevented and the reflected light from the light-shielding tape is used effectively, preventing a decrease in the amount of light and exhibiting an excellent effect that light can be emitted in one direction more reliably. I do.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a rear perspective view of the front case of the embodiment.

FIG. 3 is a plan view of a main part of the first embodiment.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front case 2 Rear case 3 Wiring board 5a Key 6 LED 9 Rubber sheet

Claims (1)

[Claims] 1. A light source for emitting light from a key or the like, a light-shielding tape is attached so that only one surface of the light source is opened, and the light-shielding tape has a light reflecting surface on an inner surface and a black outer surface. And portable electronic equipment.