JPH03147202A - Lighting apparatus - Google Patents

Abstract

PURPOSE:To reduce light absorption and reflection at the time of lighting and improve appearance when not in use by interposing a member between a light source and an illuminated part which member increases its light transmission factor when its temperature is relatively high and decreases the transmission factor when the temperature is relatively low. CONSTITUTION:At the top of a body 1 either of the shape of a box or a frame a socket 2 is attached in which a light source 3 such as an incandescent lamp is fit. A reflector member 4 is arranged to effectively direct the light from the light source 3 to a part to be illuminated. A transparent cover 5 is provided to close a light emitting opening of the body 1. When the light source 3 is turned on, the cover 5 receives heat from the light source 3 and its temperature rises. As a result, the light transmission factor of the cover 5 increases and the effect of the lighting apparatus is improved, while when the light source 3 is turned off, the temperature of the cover 5 becomes relatively low and its light transmission factor becomes small. As a result, internal components of the lighting apparatus such as the light source 3, the socket 2, and the reflector member 4 cannot be seen from the illuminated part side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a lighting fixture in which a cover, a prism, etc. are disposed between a light source and an irradiated part.

(Prior Art) Conventionally, as this type of lighting equipment, there is, for example, a recessed downlight that includes a light-transmitting cover at a light projection opening.

(Problems to be Solved by the Invention) In this type of lighting equipment, one effective way to increase the efficiency of the lighting equipment is to increase the transmittance of the translucent cover. However, increasing the transmittance causes the problem that the built-in contents of the appliance become transparent when the light is turned off, spoiling the appearance. Conversely, lowering the transmittance results in lower instrument efficiency.

The present invention has been made in order to solve these conventional problems, and provides lighting that can increase the efficiency of the fixture when it is turned on, and prevent deterioration in appearance due to built-in components being visible when it is turned off. The purpose is to provide equipment.

[Structure of the Invention (Means for Solving Problems)] The present invention provides a structure in which the transmittance is increased between the light source and the irradiated part when the temperature thereof is relatively high, and the transmittance is increased when the temperature thereof is relatively low. The structural feature is that a member that lowers the ratio is provided.

As the above-mentioned member, for example, Asmar 30 (trade name) manufactured by Asahi Kasei Industries, Ltd. can be used. The molding procedure includes molding at a high temperature of, for example, 120°C or higher to memorize high transmittance, and then molding at a room temperature of, for example, 40°C.
Cool to below (at this time, the transmittance will automatically become low).

). A member formed in this manner has a low transmittance at room temperature, but returns to a high transmittance when the temperature reaches 60° C. or higher.

(Function) When the present invention is turned on, the temperature of the member provided between the light source and the irradiated portion rises due to the heat from the light source, thereby increasing the transmittance. Therefore, the amount of light absorbed or reflected by the member can be reduced, that is, the efficiency of the device can be increased. When the light is turned off, the member does not receive heat from the light source, so its temperature decreases and the transmittance becomes relatively small. Therefore, when viewed from the side to be irradiated, the built-in contents of the device are not visible or difficult to see, and the appearance is not spoiled.

The present invention is also applicable to lighting fixtures other than recessed downlights, such as ceiling-mounted lighting fixtures and hanging lighting fixtures. In addition, the light source may be any light bulb, high-intensity discharge lamp, fluorescent lamp, etc., and the point is that the temperature of the above member is changed by the heat generated during lighting,
Therefore, it is sufficient that the transmittance can be changed. Note that a heater may be provided that acts only at the initial stage of lighting in order to promote the change in transmittance at the early stage of lighting.

(Example) An embodiment of the present invention will be described below with reference to FIG.

Although this embodiment is applied to a built-in lighting fixture, as described above, the present invention is not limited thereto. 1 is the instrument body. This instrument body 1 may be box-shaped or frame-shaped. A socket 2 is attached to the top plate portion (upper side in FIG. 1) of the main body 1, and a light source 3, such as an incandescent light bulb, is attached to the socket 2. 4
The light source 3 directs the light from the light source 3 to the irradiated area (not shown, the first
This is a reflective member provided to effectively irradiate the light downward (in the figure). Reference numeral 5 indicates a member in the present invention, and in this embodiment, it is a light-transmitting cover that closes the light projection opening of the instrument body 1. This member 5 is, for example, the above-mentioned Asahi Kasei Kogyo (
It is molded as described above using Asmar 30 manufactured by Co., Ltd. as a material. This member 5 is supported by a decorative frame 6. Although the structure of the decorative frame 6 is not shown in the drawings, well-known means such as using a V-shaped spring can be used to attach the decorative frame 6. 7 is a ceiling member. Further, 8.9 is a piece of glass for reinforcing the member 5. Of course, such glasses 8.9 are not essential to the invention.

The operation of this embodiment will be explained. When the light source 3 is on, the temperature of the member 5 increases due to the heat from the light source 3, so the transmittance of the member 5 is high.

Therefore, instrument efficiency is increased. When the light source 3 is off, the temperature of the member 5 is relatively low, so its transmittance is low. Therefore, when the device is viewed from the irradiated portion, that is, from below in FIG. 1, the built-in components of the device, such as the light source 3, socket 2, reflective member 4, etc., are not visible and the appearance is not degraded.

In addition, if the member 5 is made in the same color as the ceiling material 7, the ceiling surface can be made even more neat when the lights are turned off.

Another embodiment of the invention will be described with reference to FIG. Second
In the figure, a transparent resin or glass 11 with high heat resistance is added to the member 10 of the present invention.

Still another embodiment of the present invention will be described with reference to FIG. In this embodiment, the appearance of the layer is improved by making the member 20 almost the same as the ceiling surface 21. In addition, 22 is a decorative frame and a blind plate.

Still another embodiment of the present invention will be described with reference to FIG. In this embodiment, the member 30 of the present invention is a louver. That is, even when used as a louver, when the light is turned off, it is possible to prevent deterioration in appearance due to the internal contents of the appliance being visible when the appliance is viewed from a predetermined angle range.

[Effects of the Invention] As described above, the present invention provides the following advantages:
We installed a member that increases its transmittance when its temperature is relatively high, and decreases its transmittance when it is relatively low, so when the device is turned on, the absorption and reflection of light by the member is reduced. Efficiency can be increased, and the appearance will not deteriorate due to the internal components of the appliance being visible when the lights are turned off.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing the first embodiment of the present invention, and FIG.
The figure is a partially cutaway front view showing the main part of another embodiment, FIG. 3 is a partially cutaway front and cross-sectional view showing another embodiment, and FIG. 4 is the main part of another embodiment of the invention It is a front sectional view with a part notch showing. 1... Instrument body, 2... Socket 3... Light source. 4... Reflective member, 5.10.20.30... Member. 6... Makeup frame. Applicant Toshiba Lightic Co., Ltd. Proceeding amendment written spontaneously)

Claims (1)

[Claims] (1) The device body; A light source attached to this device body; Disposed between this light source and the irradiated part, when the temperature of the device itself is relatively high, the transmittance is high, and the transmittance is relatively low. A lighting fixture characterized by comprising: a member that sometimes lowers transmittance;