JP3140639U - Reflector for lighting device - Google Patents

Abstract

Provided are a reflector for a lighting device that efficiently reflects light emitted from a line light source such as a cathode tube in a required direction and has an excellent manufacturing cost, and a lighting device including the reflector for a lighting device. The purpose is to do.
A groove is formed in a reflector made of foamed plastic, the shape of the wall surface of the groove is a parabolic column surface, and a cold cathode ray tube, an external electrode type discharge tube or the like is located at the focal point of the wall surface of the parabolic column surface. When the linear light source is installed, the light emitted from the light source is reflected on the parabolic column wall surface and becomes an efficient reflected light beam, and an illumination device including the reflector is configured.
[Selection] Figure 1

Description

  The present invention relates to a reflector used in a lighting device and a lighting device including the reflector.

  In recent years, in order to effectively use resources on the earth, power saving of devices has been demanded. Particularly in a lighting device, the luminous efficiency becomes a problem. As the light source, a light source having excellent luminous efficiency such as a fluorescent lamp, a cathode ray tube, an external electrode type discharge tube has been developed.

Japanese Utility Model Publication 5-62911

  However, even if the light emission efficiency of the light source is excellent, resource saving and high efficiency cannot be realized as a whole unless the emitted light can be used effectively. Specifically, when a light source having the same luminous efficiency is used and a reflector with poor reflection efficiency or a reflector that is difficult to reflect reflected light in the required direction is used, the illumination device as a whole is illuminated. The efficiency cannot be improved. In particular, in a so-called surface light source illuminating device in which a plurality of linear light sources such as cold cathode ray tubes and external electrode type discharge tubes are arranged in parallel as a light source, it is a reflector that can effectively control reflected light, and is made of an inexpensive material. I can't find anything that can be manufactured.

  The inventors have found that if a parabolic groove is provided in a foamed plastic, and a thin linear light-emitting light source is arranged near the focal point, a parallel beam superior to that expected can be obtained. Initially, there was a preconception that the surface of the foamed plastic had irregularities, and such an excellent parallel beam could not be obtained. In practice, however, a higher quality parallel beam than expected was obtained.

  Therefore, the present invention aims to provide a reflector for a lighting device that efficiently reflects light from a light source in a required direction and has an excellent manufacturing cost, and a lighting device including the reflector. To do.

The device according to claim 1 is a reflector for a lighting device used in a lighting device,
The focal point of the wall whose surface is a parabolic column surface (hereinafter also referred to as “parabolic column surface groove”) and whose shape is a parabolic column surface (hereinafter also referred to as “parabolic column wall”). When a line light source is installed at the position of, light emitted from the line light source is reflected on the parabolic column wall surface to become parallel rays.

The device according to claim 2 relates to the reflector for lighting device according to claim 1,
The material for the reflector for the lighting device is a foamed plastic.

  Foamed plastic is lightweight and has the advantages of low cost and light weight, yet has a reflection efficiency that can withstand practical use even without surface treatment.

The device according to claim 3 relates to the reflector for lighting device according to claim 1,
The parabolic column surface groove is manufactured by curving a metal plate or a plastic plate.

The device according to claim 4 relates to the reflector for lighting device according to any one of claims 1 to 3,
A plurality of the grooves are arranged in parallel.

The device according to claim 5 relates to the reflector for lighting device according to any one of claims 1 to 4,
The line light source is a small-diameter cold cathode ray tube or an external electrode type discharge tube.

The invention according to claim 6 is a lighting device,
It has the reflector for lighting devices in any one of Claims 1 thru | or 5, It is characterized by the above-mentioned.

  By including the reflector for the illumination device, it is possible to manufacture an illumination device that can efficiently irradiate uniform light over the entire surface while being thin.

The device according to claim 7 is a backlight device of a liquid crystal display device,
It has the reflector for lighting devices in any one of Claims 1 thru | or 5, It is characterized by the above-mentioned.

  By providing the reflector for the illumination device, it is possible to manufacture a backlight device for a liquid crystal display device that is thin and can efficiently irradiate uniform light over the entire surface.

  According to the reflector for an illumination device according to the present invention, the light from the light source can be reflected as a uniform parallel light beam in a desired direction, and an efficient illumination device can be realized. In particular, foamed plastics are very lightweight and can be easily processed, so that they can be used in a wide range of applications. By arranging a large number of reflectors for an illumination device according to the present invention in parallel, uniform irradiation can be performed on the entire surface. Since an ideal parabolic shape can be realized, the reflection efficiency can be increased.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
(Embodiment 1)

  FIG. 1 is a side view showing an outline of the configuration of a reflector for an illumination device according to Embodiment 1 of the present invention.

In FIG. 1, 103 is a reflector for a lighting device, 115 is a parabolic column surface groove, and 105 is a parabolic column wall surface. Reference numeral 114 denotes a focal position of the parabolic column wall 105, which is a position where a light source is installed. The lighting device reflector 103 is formed of foamed plastic. Foamed plastic is inexpensive and easy to process, and the groove 105 having the shape of a parabolic column can be formed at low cost. The lighting device reflector 103 is formed with one or more parabolic column surface grooves 105 whose cut surfaces are parabolic. The plurality of parabolic column surface grooves may change the arrangement pitch according to the purpose, or may change the spreading shape of the parabola.

  FIG. 2 is a side view showing an outline of the direction of light rays when a line light source is installed at the focal point 114 of the parabolic pillar wall surface 105 in FIG.

In FIG. 2, a line light source 124 is installed at the focal point 114. Reference numeral 102 denotes a light beam reflected from the light source 124 and reflected by the reflector for the illumination device and reflected in directions parallel to each other. Reference numeral 101 denotes a light beam emitted from the line light source 124 without being reflected by the illumination device reflector. Since the parabolic pillar wall surface 105 has a parabolic shape, when the line light source 124 is placed at the focal point of the parabola, the reflected lights that are irradiated from the line light source 124 and incident on the paraboloid 105 are parallel to each other. A light beam 102 is obtained. A is a set of parallel rays 102.
Since the surface of the foamed plastic was not flat, there was a preconception that it was difficult to obtain reflected light efficiently, but in practice, a reflected light that could withstand practical use could be obtained.

In addition, since the foamed plastic has a small weight, when a reflector for a lighting device made of foamed plastic is used for the lighting device, a lightweight lighting device can be created. Furthermore, since the lighting device is often hung on the ceiling or the like, it is important that the lighting device is lightweight.
(Embodiment 2)
FIG. 3 is a side view showing an outline of the configuration of the reflector for an illumination device according to the second embodiment of the present invention.

In the case of the reflector for lighting device according to the second embodiment of the present invention, the parabolic column groove is manufactured by curving a metal plate or a plastic plate. Manufacture is performed by, for example, pressing or molding.

  In FIG. 3, 303 is the reflector for lighting devices which concerns on Embodiment 2, 315 is a parabolic column surface groove | channel, 105 is a parabolic column wall surface. Reference numeral 114 denotes a focal position of the parabolic column wall 105, which is a position where a light source is installed. The reflector for lighting device 303 is made of, for example, a metal plate.

  FIG. 4 is a side view showing an outline of the direction of light rays when a line light source is installed at the focal point 114 of the parabolic column wall surface 105 of FIG.

  In FIG. 4, reference numeral 102 denotes light rays emitted from the line light source 124 that are reflected by the reflector for the illumination device and reflected in directions parallel to each other. Reference numeral 101 denotes a light beam emitted from the line light source 124 without being reflected by the reflector for the illumination device. Since the parabolic pillar wall surface 105 has a parabolic shape, when the line light source 124 is placed at the focal point of the parabola, the reflected lights that are irradiated from the line light source 124 and incident on the paraboloid 105 are parallel to each other. A light beam 102 is obtained. A is a set of parallel rays 102.

  FIG. 5 is a perspective view of the reflector for lighting device according to the first embodiment.

6 is a perspective view of a reflector for a lighting device according to Embodiment 2. FIG.
In addition, a highly efficient reflected light beam can be obtained by using a cold cathode ray tube or an external electrode type discharge tube with a small diameter.

It is a side view which shows the outline of a structure of the reflector for illumination devices which concerns on Embodiment 1 of this invention. It is a side view which shows the outline of the direction of a light ray at the time of installing a line light source in the focus position 114 of the parabolic pillar wall surface 105 of FIG. It is a side view which shows the outline of a structure of the reflector for illumination devices which concerns on Embodiment 2 of this invention. It is a side view which shows the outline of the direction of a light ray at the time of installing a line light source in the focus position 114 of the parabolic pillar wall surface 105 of FIG. 3 is a perspective view of the reflector for lighting device according to Embodiment 1. FIG. It is a perspective view of the reflector for lighting devices which concerns on Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 103 Reflector for illuminating devices 105 Parabolic column wall surface 114 Position of focal point of parabolic column wall surface 115 Parabolic column surface groove

Claims (7)

  The focal point of the wall whose surface is a parabolic column surface (hereinafter also referred to as “parabolic column surface groove”) and whose shape is a parabolic column surface (hereinafter also referred to as “parabolic column wall”). When the line light source is installed at the position, the light emitted from the line light source is reflected by the parabolic column wall surface to become a parallel light beam.   2. The reflector for lighting device according to claim 1, wherein the material for the reflector for lighting device is a foamed plastic.   2. The reflector for an illuminating device according to claim 1, wherein the parabolic columnar groove is manufactured by curving a metal plate or a plastic plate.   4. The lighting device reflector according to claim 1, wherein a plurality of the grooves are arranged in parallel. 5.   5. The reflector for lighting device according to claim 1, wherein the line light source is a small-diameter cold cathode ray tube or an external electrode type discharge tube.   The illuminating device provided with the reflector for illuminating devices in any one of Claims 1 thru | or 5. The backlight apparatus of the liquid crystal display device provided with the reflector for illumination devices in any one of Claims 1 thru | or 5.

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