JPS6231935Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting device, and more particularly to a lighting device that cools the heat generated by light emission from a light source and that makes it difficult for the irradiated area to generate heat.

Most lighting devices are equipped with a reflector that reflects the light from the light source, but the reflectance of the reflector is not 100%, and the structure is designed to reflect the light in a certain direction. It is set up to cover. As a result, the heat generated by the light source is transmitted to the inside of the reflector, resulting in a higher temperature in this area than in the surrounding area, shortening the lifespan of the light source. In order to prevent the light source or the reflector from becoming too hot, attempts were made to create slits in some of the reflectors or change the material of the reflector, but they were not able to achieve sufficient effects. Ta. In particular, industrial lighting devices installed in machine tools and the like are used for a very long time, and the vicinity of the light source tends to reach a relatively high temperature, so improvements have been desired. In addition, this type of lighting device often illuminates an object to be irradiated, such as a workpiece, from a short distance when in use, and when used continuously for a long time, it can illuminate not only the lighting device itself but also the object to be irradiated. The temperature of the exposed side often rises due to heat absorption, and improvements have been desired in this regard as well.

The present invention was developed in view of the above-mentioned conventional circumstances, and the heat of the lighting device itself is removed by forced air circulation for cooling, and the illuminated side is irradiated with light that does not contain infrared rays. In particular, it is an object of the present invention to provide a lighting device with a novel configuration that can suppress heat generation and temperature rise of the lighting device and the illuminated side.

The present invention will be explained below with reference to the illustrated embodiments.

A lighting device 10 which is an embodiment of the present invention shown in FIG. 1 includes a bowl-shaped protective cover 1 with one side open;
A dish-shaped reflector 2 located inside the cover 1 and having a hole 21 at the center of the bottom; a light bulb 3 such as a halogen lamp as a light source inserted into the hole 21 of the reflector 2;
The reflector 2 includes a support 4 provided on the back surface thereof and having a socket 41 to which a light bulb 3 is attached.
The base end of the support column 4 is fixed to a mounting member 5 having a U-shaped cross section fixed to the back surface of the cover 1 through a hole 12 in the bottom of the cover 1. The lighting device 10 is installed by attaching a support arm or the like of a normal lighting device to the mounting member 5, or by attaching the mounting member 5 to a predetermined location. Further, the reflector 2 has a cylindrical body 6 having an inner diameter approximately equal to that of the hole 21 and having the support 4 coaxially disposed therein.
The cylindrical body 6 is rotatably held on the column 4 via a bearing 61, and a belt 63 is hung on a pulley 62 provided on the cylindrical body 6.
The cylinder body 6 and the reflector 2 are rotated around the light bulb 3 by a rotary pulley 52 of a motor 51 provided on the mounting member 5. Further, on the back surface of the reflector 2, a plurality of, for example, plate-shaped blades 22, which extend in the radial direction and have appropriate dimensions and shapes, are attached at equal intervals along the circumferential direction in a radially uniform manner. When the reflector 2 rotates, air near the back surface of the reflector 2 moves due to the action of the blades 22, and the mounting member 5
The outside air taken in through the hole 53 of the cover 1 is passed through the hole 12 of the cover 1.
The liquid flows through the area on the back surface of the reflector 2 through the gap between the outer periphery of the reflector 2 and the inner wall of the cover 1, and is discharged to the outside through a window 11 formed in the peripheral wall of the cover 1. In this case, contrary to the case described above, the flow of cooling air is taken in through the window 11 and flows through the holes 53 of the member 5.
It may also be released from. Further, a lens portion 7 is attached to the entire opening of the cover 1, which serves to converge or diffuse light from the reflector 2 and the light bulb 3, or to protect the light bulb. An infrared reflective film 8 made of a metal such as Au, Ag, Pt, or Al, or a nonmetal such as ceramics, SiC, or Al ₂ O ₃ is formed on the back surface of the lens portion 7 facing the reflector 2 . This infrared reflective film 8 is for reflecting infrared rays, and can be coated by various vapor deposition methods such as vacuum deposition, cathode sputtering, or ion plating.
It is formed as a very thin film of around 100 Å or less.

Next, the operation of the lighting device 10 configured as described above will be explained. First, in order to dissipate the heat generated in the reflector 2 etc. by lighting the light bulb 3, the motor 5
1 to rotate the reflector 2, and together with the reflector 2, the blades 22 are rotated to form a flow of cooling air that exchanges internal air with external air. This air flow is located behind the lighting device 10, that is, at the mounting member 5.
from the window 1 through the annular gap between the cover 1 and the reflector 2.
1 to the outside, or vice versa. Due to this flow, the air present in the gap on the back surface of the reflector 2 moves to the outside of the cover 1, and the air on the back surface of the reflector 2 always flows into the air outside the cover 1. Therefore, the temperature between the cover 1 and the reflector 2 is kept almost constant, and the reflector 2 and the light bulb 3 can be cooled. In addition, the light emitted from the light bulb 3 and the reflector 2 is irradiated to the outside after passing through the infrared reflective film 8 and the lens part 7, but when passing through the infrared reflective film 8, the infrared rays are reflected or partially absorbed. The light beam irradiated to the outside becomes a light beam with reduced infrared rays. In general, infrared rays are called heat rays, and are light rays with wavelengths that have the greatest heating or exothermic effect among light rays. When a substance is irradiated with near-infrared rays, thermal motion within the substance is excited and the temperature rises. Therefore, if the irradiating light does not contain infrared rays, this thermal motion will not be excited. Therefore, the lighting device 10
By making sure that the irradiated light does not include infrared rays, it is possible to suppress heat generation on the irradiated side. Note that since visible light is not reflected, there is no concern that the illumination effect of the illumination device 10 will be degraded by providing the infrared reflective film 8.

Further, in the embodiment described above, the infrared reflective film 8 was formed on the lens portion 7, but it is not necessary to provide the lens portion 7. Instead, a protective transparent body may be provided, and the infrared reflective film 8 may be attached to the transparent body. You can. Furthermore, the shape of the reflector 2, the configuration of the blades 22, etc. may be such that the reflector and the blades are integrally molded, and other configurations are not limited to those of the above embodiments. The infrared reflecting film 8 may be one that selectively absorbs infrared rays to a certain extent or more, and even if the temperature rises due to absorption of infrared rays, it is effectively cooled by the flow of cooling air. Also, for example, the Utility Application filed in 1983-
As described in No. 49500, in addition to the light bulb fixed type, it is also possible to use a structure in which the light bulb, the reflector, the socket 41, and the support 4 are integrally and rotatably supported on a cover or a mounting member and rotated.

As explained above, the present invention provides a lighting device that includes a light source, a reflector that reflects light from the light source, and a cover that encloses the reflector. Or, it is rotatably attached to the mounting member, and a window is formed on the cover to exhaust the air moving by the rotation of the blades, and an infrared reflective surface is formed on the entire surface of the cover to reflect or absorb infrared rays from the light source and the reflector. It is equipped with a membrane. Therefore, since the air between the cover and the reflector is constantly exchanged with air at a relatively low temperature outside, the heat generated in the light source and the reflector can be efficiently cooled. Furthermore, since the irradiated light does not contain infrared rays, it is possible to prevent heat generation on the irradiated side.

[Brief explanation of the drawing]

The drawing is a sectional view of a lighting device showing an embodiment of the present invention. 1...Cover, 2...Reflector, 3...Light bulb, 8
...Infrared reflective film, 11...window, 22...blade.

Claims (1)

[Claims for Utility Model Registration] 1. A lighting device comprising a light source, a reflector that reflects light from the light source, and a cover that encloses the reflector, wherein a plurality of blades are provided on the back surface of the reflector, This reflector is rotatably attached to the cover, a window is formed in the cover through which air is discharged by the rotation of the blades, and a window is formed on the front surface of the cover,
A lighting device comprising an infrared reflective film that reflects infrared rays in the light emitted from the light source and the reflector. 2. The lighting device according to claim 1, wherein the infrared reflective film is a film formed by vapor deposition on the inner surface of a light irradiation lens.