JP2001305257A - Light guide plate for illuminating knob - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide plate for-illuminating knobs capable of illuminating many knobs with one light source, thus enhancing freedom for the design of a light source location and so on. SOLUTION: The light guide plate 1 for-illuminating knobs is provided with a conical reflecting surface 1a to reflect radially the light from a light source 3 disposed on a central axis line of the conical shape 1a at the reflecting surface 1a to guide the light to the knob.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knob illuminating device for operating electronic equipment, and more particularly to a knob illuminating light guide plate capable of illuminating many knobs with one light source.

[0002]

2. Description of the Related Art Conventionally, when a plurality of knobs are illuminated by one light source, a light guide plate 4 for knob illumination as shown in FIG. 3 has been used. As shown in the drawing, V-shaped notches are formed at the center of the light guide plate 4 for knob illumination, and V-shaped notches are formed at both ends, and planar reflecting surfaces 4b and 4b are formed at both ends by trapezoidal notches. Is formed.

The light from the light source 3 disposed at a position facing the center of the light guide plate 4 for knob lighting receives V-shaped reflection surfaces 4a, 4a,
a, the light is reflected in two directions,
The light is reflected by b and emitted in the directions A and A shown in the figure to illuminate the respective knobs.

[0004]

In the conventional light guide plate for knob illumination shown in FIG. 3, only two knobs can be illuminated by one light source. Further, the position of the light source is limited to a line connecting the two knobs, and there is a problem that the degree of freedom in design is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to illuminate many knobs with one light source, thereby increasing the degree of freedom in designing the arrangement of the light sources. An object of the present invention is to provide a light guide plate for knob lighting.

[0006]

A light guide plate for knob illumination according to the present invention has a conical reflecting surface, and reflects light from a light source arranged on the central axis of the conical shape radially on the reflecting surface. Let it lead to the knob.

In the above-mentioned light guide plate for knob lighting,
The light reflected radially is further reflected by a plurality of reflecting surfaces and guided to respective knobs.

Further, the light guide plate for knob illumination of the present invention has a polygonal pyramid-shaped reflecting surface, and reflects light from a light source arranged on the central axis of the polygonal pyramid radially on the reflecting surface. It leads to a knob.

In the light guide plate for knob lighting,
The light reflected radially is further reflected by a plurality of reflecting surfaces and guided to respective knobs.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A light guide plate for knob illumination according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a light guide plate for knob illumination according to a first embodiment of the present invention. As shown in the figure, a conical reflecting surface 1a is formed by a conical notch in the center of the light guide plate 1 for knob illumination, and a flat reflecting surface 1b is formed by a trapezoidal notch around the conical reflecting surface 1a. .. Are formed.

Light from a light source 3 arranged at a position facing the center of the light guide plate 1 for knob illumination is radially reflected by a conical reflecting surface 1a, and furthermore, is reflected by a planar reflecting surface 1b, 1b,.
, And are radiated in the B, B,... Directions shown to illuminate the respective knobs. In this example, four knobs can be illuminated by one light source.

FIG. 2 shows a light guide plate for knob illumination according to a second embodiment of the present invention. As shown in the figure, a conical reflecting surface 2a is formed by a conical convex portion in a concave portion at the center of the light guide plate 2 for knob illumination, and a planar reflection is formed by a trapezoidal cut around the conical reflecting surface 2a. Four surfaces 2b, 2b,... Are formed.

Light from a light source 3 disposed at a position facing the center of the light guide plate 2 for knob illumination is radially reflected by a conical reflecting surface 2a, and further reflected by planar reflecting surfaces 2b, 2b,.
, And are radiated in the C, C,... Directions shown to illuminate the respective knobs. In this example, four knobs can be illuminated by one light source.

In the embodiment, a case where four knobs are illuminated by one light source has been described. However, the present invention can be applied to a case where three or five or more knobs are illuminated by one light source. Further, a polygonal pyramid reflecting surface can be used instead of the conical reflecting surface.

[0015]

According to the light guide plate for knob illumination of the present invention, many knobs can be illuminated by one light source. In addition, the degree of freedom in designing the arrangement of the light sources increases.

[Brief description of the drawings]

FIG. 1 (a) is a plan view showing a knob light-guiding light guide plate according to a first embodiment of the present invention, and FIG. 1 (b) is a sectional view showing the knob light-guiding light guide plate.

FIG. 2A is a cross-sectional view showing a knob light-guiding light guide plate according to a second embodiment of the present invention, and FIG. 2B is a bottom view showing the knob light-guiding light guide plate.

FIG. 3A is a plan view showing an example of a conventional light guide plate for knob lighting, and FIG. 3B is a cross-sectional view showing the light guide plate for knob lighting.

[Explanation of symbols]

1 light guide plate for knob lighting, 1a conical reflective surface, 1b
Planar reflective surface 2 Light guide plate for knob illumination, 2a Conical reflective surface, 2b
Planar reflecting surface 3 Light source 4 Light guide plate for knob illumination, 4a V-shaped reflecting surface, 4b Planar reflecting surface

Claims (4)

[Claims] 1. A knob lighting guide, comprising: a cone-shaped reflecting surface, wherein light from a light source disposed on a central axis of the cone is reflected radially by the reflecting surface and guided to a knob. Light board. 2. The light guide plate for knob illumination according to claim 1, wherein said radially reflected light is further reflected by a plurality of reflection surfaces and guided to respective knobs. 3. A knob lighting device comprising a polygonal pyramid-shaped reflecting surface, wherein light from a light source arranged on the central axis of the polygonal pyramid is radially reflected by the reflecting surface and guided to a knob. Light guide plate. 4. The light guide plate for knob illumination according to claim 3, wherein the light reflected radially is further reflected by a plurality of reflection surfaces and guided to respective knobs.