JPH0750788Y2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an illuminating device, and more particularly to an illuminating device for transmitting and illuminating a display unit by reflecting and guiding light of a light source by a reflecting surface provided on a light guide.

[Prior Art] A case where this type of illumination device is applied to a push button illumination device will be described as an example. In the push button lighting device, as shown in FIG. 7, a circuit board 3 is provided in front of a light guide 2 provided in a case 1, and the circuit board 3 has a light-transmitting property and is transparent. A plurality of rubber switches 4 made of one continuous elastically deformable silicone rubber sheet are provided.
Push buttons 5 are provided on the upper part of each. Further, on the rear surface of the light guide body 2, a reflecting surface formed so as to reflect and guide the light of the light source 6 arranged on one side of the light guide body 2 to each of the push buttons 5.
2A is formed, and the reflective surface 2A is formed on the circuit board 3.
A through hole 7 is formed to transmit the reflected light from the push button 5 side.

Then, the light incident on the light guide body 2 when the light source 6 is turned on is reflected by the reflecting surface 2A, and the reflected light is made incident on each push button 5 from the through hole 7 through the translucent rubber switch 4, The translucent display portion provided on the front surface of each push button 5 is simultaneously illuminated by transmission.

Further, in a lighting device using this type of light guide, in order to uniformly illuminate and display a plurality of displays formed on the display panel, a light source is provided on the back side of the light guide in correspondence with the display unit of the display panel. A display panel in which a flat plate-shaped or arc-shaped reflection surface is formed so as to be closer to the display panel as the distance increases, and a projection is formed in a portion that does not correspond to the display portion so as not to block the optical path of light in the light guide body. The illuminating device is proposed in Japanese Utility Model Publication No. 60-4223.

[Problems to be Solved by the Invention] By the way, the light of the light source 6 that enters the light guide 2 tends to be attenuated as the distance from the light source 6 increases, and the amount of light tends to be insufficient. As described above, in the case of illuminating and displaying each display unit using the light guide body 2, there is a limit to increase the illumination brightness of each display unit only by the illumination light of the light source 6 incident on the light guide body 2, but In the conventional illuminating device for a display panel proposed in Japanese Utility Model Publication No. 60-4223, the periphery of the illuminating lamp serving as a light source is covered by a light-shielding cylindrical portion, and most of the illuminating light of the illuminating lamp is guided. Even if the projection can receive a small amount of indirect light that leaks from the gap between the light-shielding tube and the light guide, the projection is directed toward the light body side, and the projection tries to enter the reflecting surface. The projections are formed so as not to block the optical path of the light.Because the projections are formed between the reflective surfaces, that is, in the parts that do not correspond to the display section, the indirect light incident on the projections is reflected by the reflection surface to the display section. Can not be reflected. Therefore, each display section is illuminated and displayed only by the illumination light of the light source entering the light guide body. In this way, in order to transmit and illuminate the display parts all at once by the illumination light of the light source that enters the light guide body, and to uniformly transmit and illuminate each display part as in Japanese Utility Model Publication No. 60-4223. , Inevitably, the illumination balance will be set with reference to the illumination brightness of the darkest display section away from the light source, and as a result, the respective display sections can be uniformly transmitted and illuminated, but the display section becomes dark as a whole. However, there is a problem that visibility is deteriorated.

Therefore, it is an object of the present invention to provide an illuminating device capable of increasing the amount of light reflected by a reflecting surface formed on a light guide and increasing its illumination brightness to maintain good visibility.

[Means for Solving the Problems] A display member having a translucent display section is arranged on the front surface of a light guide body housed in a case, and a reflection surface is provided on the rear surface of the light guide body corresponding to the display section. In the illuminating device for forming and transmitting the illumination of the display unit by reflecting and guiding the light of the light source disposed in the side edge of the light guide rear surface side in the case on the reflecting surface, Direct light of the light source, which has a lower end portion of the light guide body substantially flush with the reflection surface and protrudes from the rear surface of the light guide body, and is directly radiated into the case from the light source. It is provided with a light receiving projection for receiving indirect light.

[Operation] While the light source is turned on, the illumination light is guided into the light guide body, and a part of the direct light of the light source that directly enters the light guide body and the indirect light emitted inside the case is incident on the light receiving protrusion. Illumination light that has been incident and has entered the light guide and the light-receiving projection is reflected by the reflection surface toward the display section to illuminate the display section of the display member through transmission, thereby increasing the amount of light reflected from the reflection surface. The brightness is increased.

[Embodiment] An embodiment in which the present invention is applied to a push-button illumination device will be described below as an example.

1 to 3 show a first embodiment of the present invention, in which 11 is a case formed by dividing an upper case 11A and a lower case 11B into two parts, and the inside of the case 11 is made of a light-transmitting synthetic resin. A light guide 12 is arranged, and a hard circuit board 13 is laminated on the front surface of the light guide 12. Reference numeral 14 denotes a plurality of rubber switches, which are arranged on the front surface of the circuit board 13 and have a light-transmitting property and which are elastically deformable and made of one continuous silicone rubber. A movable contact 15A is formed so as to face the fixed contact 15 provided on the substrate 13. In addition, the circuit board 13 has a through hole for transmitting reflected light from a reflecting surface, which will be described later, corresponding to each rubber switch 14.
16 are drilled.

Reference numeral 17 denotes a push button which is a display member arranged on the upper surface of each of the rubber switches 14, and the push button 17 has a cap 17B made of an opaque synthetic resin around a base member 17A made of a synthetic resin having a light transmitting property. And a translucent display portion 18 is formed by printing on the rear surface of the base member 17A.

Further, a light source 19 is disposed on one side of the light guide body 12, and the rear surface of the light guide body 12 reflects the light of the light source 19 to each push button 17 in correspondence with each push button 17. A reflecting surface 20 having an inclination of 0 ° is formed, and further, the light guide 12 has a light receiving projection 21 in which the lower end of the reflecting surface 20 is connected to the reflecting surface 20 and protrudes to the rear surface of the light guiding body 12. Are integrally formed. Then, when the light source 19 is turned on, one of the direct light of the light source 19 that guides this illumination light into the light guide body 12 and directly enters the light guide body 12 and the indirect light that is emitted into the case 1. Part to receive light
21 and is reflected and guided to each push button 17 side by the reflecting surface 20, and the reflected light is transmitted from the through hole 16 to the switch 14
The light is made incident on the inside of the push buttons 17 via the to illuminate the display portions 18 of the push buttons 17 all at once.

Therefore, in the lighting device of the present invention, in addition to the illumination light guided in the light guide 12, direct light and indirect light of the light source 19 incident on the light receiving projection 21 are reflected to the push button 17 side by the reflecting surface 20. It is possible to reflect and guide light, and even in the display unit 18 at a location distant from the light source 19, it is possible to increase the illumination brightness of the display unit 18 by increasing the amount of reflected light from the reflection surface 20, and its visibility is good. Can be kept at Further, in this case, the projection amount A and the width dimension W of the light receiving projection 21 projecting to the rear surface of the light guide body 12 are set as the light source.
Set gradually larger as you move away from 19, and set the reflective surface 20
Even if a plurality of display units 18 are transmitted and illuminated by a single light source 19 by forming a large area, only the display unit 18 close to the light source 19 is locally illuminated and displayed brightly. Therefore, it is possible to suppress and uniformly transmit and illuminate each display unit 18, and maintain a good illumination balance.

4 and 5 show a second embodiment of the present invention. The same parts as those of the first embodiment are designated by the same reference numerals, and the detailed description thereof will be omitted.

In this embodiment, the instrument main body 22 is housed and fixed in the case 11, and the dial 23, which is a light-transmissive display member, is laminated on the front surface of the instrument main body 22 through the light guide 12, and the letters are displayed. A light-transmitting ink is applied to the front surface of the plate 23 corresponding to the display portion, and a light-shielding ink is applied to the other portions to form a display portion 24 such as scales, numbers and symbols. Further, a reflective surface 20 is formed on the rear surface of the light guide 12 corresponding to the display section 24 as in the first embodiment, and the reflective surface 20 is connected to the rear surface of the light guide 12. A light-receiving protrusion 21 that protrudes is formed. By turning on the light sources 19 arranged on both sides of the light guide 12, the illumination light guided into the light guide 12, the direct light of the light source 19 and a part of the indirect light emitted into the case 1 are partially removed. By reflecting the illumination light incident on the light receiving projection 21 on the display section 24 by the reflection surface 20, the illumination brightness of the display section 24 is increased and the visibility thereof is maintained in the same manner as in the first embodiment. You can

The present invention is not limited to the above embodiments,
Various modifications are possible within the scope of the present invention,
For example, the lighting device of the present invention can be applied to not only pushbuttons and lighting devices for measuring instruments but also display devices for various measuring instruments such as liquid crystal displays, and the shape of the reflecting surface is, for example, as shown in FIG. A plurality of reflecting surfaces 20A may be formed, and white ink may be printed on the reflecting surfaces to adjust the reflectance of the illumination light.

[Advantages of the Invention] The present invention has a display member having a translucent display unit on the front surface of a light guide housed in a case, and a reflective surface corresponding to the display unit on the rear surface of the light guide member. In the illuminating device for forming and transmitting the light of the light source of the light source disposed on the side edge of the light guide rear surface in the case to the reflective surface, the reflective surface of the reflective surface is formed. Direct light of the light source having a lower end portion having substantially the same plane as the reflection surface and protruding from the rear surface of the light guide body and directly entering the light guide body, and indirect radiation from the light source into the case. By providing the light-receiving protrusion that receives light, it is possible to increase the amount of reflected light that is reflected and guided to the display unit, and it is possible to uniformly supplement the overall illumination effect of the display unit. Can be provided.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is an exploded perspective view, FIG. 3 is a plan view of an essential part, FIG. 4 and FIG. Shows a second embodiment of the present invention, FIG. 4 is an overall sectional view, FIG. 5 is an enlarged sectional view of an essential part, FIG. 6 is a sectional view of an essential part showing a modified example, and FIG. 7 is a conventional example. FIG. 11 …… Case 12 …… Light guide 17 …… Push button (display member) 18,24 …… Display section 19 …… Light source 20,20A …… Reflecting surface 21 …… Light receiving projection 23 …… Dial plate (display member )

Claims (1)

[Scope of utility model registration request] 1. A display member having a translucent display section is disposed on the front surface of a light guide body housed in a case, and a reflecting surface is formed on the rear surface of the light guide body in correspondence with the display section, In the illuminating device which reflects and guides the light of the light source arranged on the side edge of the light guide rear surface side in the case to the reflective surface, the lower end portion of the reflective surface is provided in the illuminating device. It receives the direct light of the light source, which has substantially the same plane as the reflecting surface and projects from the rear surface of the light guide body, and directly enters the light guide body, and the indirect light emitted from the light source into the case. An illuminating device having a light-receiving protrusion.