JP2003297121A - Glass body for lighting fixture and illuminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent excessive quantity of transmission of ultra violet rays to an irradiated body side due to the fact that when an ultra violet ray absorbing film is formed to be relatively thin, the absorption of the ultra violet ray in a part where irradiation by the ultra violet ray is great is not sufficient since in the conventional technique, the thickness of the ultra violet ray absorbing film is not taken into account. <P>SOLUTION: The ultra violet ray absorbing film 2 is formed on approximately the whole surface of one surface side (the side which is facing the light source when attached to a lighting fixture main body) of a translucent base board 1. The ultra violet ray absorbing film 2 is formed to be thicker in a central part than in the surrounding parts as shown in drawing 1 even when seen from the backside and the right and left sides of the drawing 1. When this lighting fixture cover 3 is used, the ultra violet ray quantity can be absorbed more than 90% over the whole surface of the cover 3 and the ultra violet ray quantity transmitted through the cover 3 can be made approximately zero. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture cover and a lighting device for reducing ultraviolet light emitted from a light source to the side of an object to be irradiated.

[0002]

2. Description of the Related Art It is sometimes required to reduce the amount of ultraviolet rays from a lighting device in order to prevent discoloration and deterioration of an object to be irradiated and to prevent insects. As one means in this case, it is already known that a translucent cover provided in a light projecting opening of a lighting fixture has an ultraviolet absorbing function. Conventionally, as an example of a protective cover for blocking ultraviolet rays, the actual fair 7-314
The one disclosed in Japanese Patent No. 63 has been proposed (prior art 1). In this publication, a coating composition containing zinc oxide as a main component is applied to at least one surface of a protective cover. In addition, according to this publication, the absorption of ultraviolet rays is good, the brightness of the luminaire is not reduced, and the manufacturing method is easy and can be supplied at low cost.

As another conventional technique, Japanese Patent Laid-Open No. 11-
The thing of 195309 gazette is proposed (prior art 2). This publication discloses that a photocatalytic film is formed on the surface of a translucent substrate, and that the film thickness of the photocatalytic film is varied depending on the site of the substrate. According to this publication, it is possible to provide a lighting device capable of preventing the attachment of dirt.

[0004]

The prior art 1 has the following problems.
No consideration is given to the thickness of the ultraviolet absorbing film. Therefore, when the ultraviolet absorbing film is formed to be relatively thin, the ultraviolet ray is not sufficiently absorbed in the portion directly irradiated with the ultraviolet rays such as the portion directly below the light source, and the amount of ultraviolet ray transmitted to the irradiated side increases. become. On the other hand, if the ultraviolet absorbing film is formed to be relatively thick, the amount of visible light absorbed will also increase, resulting in a decrease in brightness as an illumination device.

In the prior art 2, the film thickness of the photocatalyst film is varied depending on the site of the substrate, but this is in consideration of making the photocatalytic action uniform. Therefore, it is technically different from achieving uniform UV absorption, and as a result, it cannot be said that UV is effectively absorbed while effectively transmitting visible light.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting equipment cover and a lighting device capable of effectively absorbing ultraviolet rays while effectively transmitting visible light and reducing the amount of ultraviolet rays to an irradiated object as much as possible. .

[0007]

According to a first aspect of the present invention, there is provided a lighting fixture cover comprising: a light-transmitting substrate disposed in a light projecting opening of a lighting fixture body; and a surface of the light-transmitting substrate facing a light source. And an ultraviolet absorbing film which is applied and has a relatively thick central portion and a thin peripheral portion.

In the invention described in claim 1 and the following invention, each configuration and each term are defined as follows unless otherwise specified. The translucent substrate is made of glass or resin, and whether it is transparent or translucent may be determined according to the application. When glass is used, it is preferable to use soda lime glass as the substrate from the viewpoint of ultraviolet absorption performance.

Further, the ultraviolet absorbing film is made according to Japanese Utility Model No. 7-314.
As described in Japanese Patent Publication No. 63-63, it is preferably formed by applying a coating composition containing zinc oxide as a main component, and zinc oxide has a particle size of 0.1 μm or less, preferably 0.005 to 0.05 μm. Using the powder from
It may be dispersed in the binder described in Japanese Patent No. 1463. As a coating method, spin coating, spray coating, roll coating, or the like can be used.
The thickness of the absorption film preferably continuously changes from the central part to the peripheral part, but may change stepwise depending on the case. Further, the degree of change in film thickness may be determined according to the amount of ultraviolet rays applied to each part. Furthermore, the relatively thick central portion and the thin peripheral portion do not necessarily mean that the entire central portion is thicker than the peripheral portion, and include, for example, a portion that is thinner than the peripheral portion. It includes things that can be said to be relatively thick as a whole.

According to a first aspect of the present invention, in an ordinary lighting device in which a light-transmitting substrate is provided in the light-projecting opening of a fixture body having a light-projecting opening and containing a light source, the ultraviolet irradiation amount is transparent. It utilizes the phenomenon that the number is largest in the central part of the optical substrate and gradually decreases toward the periphery. That is, by changing the thickness of the ultraviolet absorbing film in a relationship inverse to the irradiation amount of ultraviolet rays (it is not necessary to be strictly inversely proportional), it is possible to reliably absorb the ultraviolet rays in the portion where the amount of ultraviolet rays is large. However, the portion with a small amount of ultraviolet rays does not absorb ultraviolet rays and visible light more than necessary. Therefore, the balance between ultraviolet absorption and visible light transmission is improved.

Further, since the ultraviolet absorbing film is applied, it is easier to mold and the cost can be reduced as compared with the case where the multilayer interference film is vapor-deposited. On the other hand, the applied product is easily scratched and easily peeled off, but by forming it on the surface of the translucent substrate facing the light source, that is, the inner surface of the device,
Such worries have been eliminated or diminished.

The luminaire cover according to claim 2 is a glass substrate made of reinforced soda lime, which is disposed in the light projecting opening of the luminaire main body; and is applied to the surface of the glass substrate facing the light source. And an ultraviolet absorbing film having a relatively thick central portion and a thin peripheral portion.

According to the invention of claim 2, the same operation as that of the invention of claim 1 can be obtained. Further, in the invention described in claim 2, by using the glass substrate made of soda lime, the ultraviolet absorbing property of the substrate itself can be utilized, and the thickness of the ultraviolet absorbing film can be reduced accordingly.

A lighting device according to a third aspect of the present invention is a lighting fixture main body having a light projecting opening; a discharge lamp provided in the main body of the lighting fixture; and a lighting device provided in the light projecting opening. And a cover for lighting equipment.

In a third aspect of the invention, the discharge lamp is a low pressure discharge lamp such as a fluorescent lamp when the filled vapor pressure is high,
Any high-pressure discharge lamp such as a high-intensity discharge lamp may be used,
The electrode may be either one having an electrode inside or one having an electrode outside. However, it is obvious that the present invention is particularly effective in the case of a light source having a large amount of ultraviolet irradiation.

The invention according to claim 3 is the invention according to claim 1 or 2.
A lighting device having the function of the described invention is obtained, and as a result,
It is possible to provide an illumination device in which the irradiation amount of ultraviolet rays to the irradiation target is small and the reduction of visible light is small.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention
The description will be made with reference to 1 to 6. 1 is a plan view conceptually showing an embodiment of a lighting fixture cover according to the present invention, FIG. 2 is a partial cross-sectional plan view showing a simplified embodiment of the same lighting device, and FIG. 3 is a bottom view thereof. FIG. 4 is a diagram showing the spectral distribution of a discharge lamp used in the lighting device, FIG. 5 is a diagram showing the amount of ultraviolet rays per unit area by numerical values, and FIG. 6 is a diagram also showing the same.

In FIG. 1, reference numeral 1 is a transparent substrate made of soda lime glass. This substrate 1 is approximately 700
Heat treatment at ℃ is applied, and strengthening treatment with different stresses on the surface and inside is performed. An ultraviolet absorbing film 2 is formed on substantially the entire one surface of the transparent substrate 1 (the surface facing the light source when attached to the main body of the lighting fixture). Although not shown, the ultraviolet absorbing film 2 is also formed such that the thickness of the central portion is thicker than that of the peripheral portion when viewed from the back surface and the left and right side surfaces of FIG. 1 as well. That is, the film thickness is changed concentrically. Note that, although FIG. 2 conceptually shows the thickness of the ultraviolet absorbing film 2 as a whole and the degree of change, it is actually several μm or less.

Such a lighting fixture cover 3 is provided in the light projecting opening 5 of the lighting fixture body 4 shown in FIGS. 2 and 3, for example. Although the detailed configuration is omitted in FIG. 2, it is usually supported by a frame body, and the opening 5 of the instrument body 4 can be attached so as to be openable and closable or detachable. Reference numeral 6 denotes a discharge lamp, which is provided in the instrument body 4. In the present embodiment, the electrodeless discharge lamp (ENDURA100 sold by Mitsubishi Electric Osram) is used.
W) is used. Reference numeral 7 is a support coil having an exciting coil function of supplying electric power to the discharge lamp 6 and also having a function of supporting the discharge lamp 6. As shown in FIG. 4, the spectral distribution of the discharge lamp 6 is such that the ultraviolet irradiation amount near 400 nm is relatively large. Reference numeral 8 is a reflector, and 9 is a case housing a lighting device for starting and lighting the discharge lamp 6.

Next, the operation of this embodiment will be described. First, FIG. 5 and FIG. 6 show the measurement results of the amount of ultraviolet rays per unit area at each part of the cover when the cover for a lighting fixture which does not have the present invention, that is, does not have an ultraviolet absorbing film is used. FIG. 5 is shown by numerical values, and FIG. 6 is shown graphically. In this measurement, an electrodeless discharge lamp (ENDURA150W sold by Mitsubishi Electric Osram) was used as the discharge lamp 6.
Was used, and the measurement conditions are shown in FIG. As is clear from FIGS. 5 and 6, the amount of ultraviolet rays emitted from the discharge lamp 6 to the cover varied greatly depending on the cover portion.

On the other hand, when the lighting fixture cover 3 shown in FIG. 1 is used, 90% or more of the amount of ultraviolet rays can be absorbed over the entire surface of the cover 3 and the ultraviolet rays passing through the cover 3 can be substantially zeroed. Was there. Further, in this case, it will be easily understood that visible light is less absorbed in the portion where the ultraviolet absorbing film 2 is relatively thin, and the decrease in brightness can be prevented accordingly.

[0022]

According to the first aspect of the present invention, it is possible to provide a cover for a lighting fixture which can surely reduce ultraviolet rays toward the illuminated direction and prevent unnecessary absorption of visible light.

According to the second aspect of the present invention, in addition to the first aspect of the invention, the ultraviolet ray absorbing performance of soda lime glass can be utilized to further surely reduce the ultraviolet ray and to make the ultraviolet ray absorbing film thinner. A possible lighting fixture cover can be provided.

The invention according to claim 3 can provide a luminaire capable of reducing the amount of ultraviolet rays to an object or the like and exhibiting the same effect as that of the invention according to claim 1 or 2.

[Brief description of drawings]

FIG. 1 is a plan view conceptually showing an embodiment of a lighting fixture cover according to the present invention.

FIG. 2 is a partial cross-sectional plan view showing the embodiment of the lighting device in a simplified manner.

[Figure 3] Similarly, bottom view

FIG. 4 is a diagram showing a spectral distribution of a discharge lamp used in a lighting device.

FIG. 5 is a diagram showing numerical values of ultraviolet rays per unit area.

FIG. 6 is a diagram similar to the one shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Translucent substrate, 2 ... Ultraviolet absorbing film, 3 ... Lighting fixture cover, 4 ... Lighting fixture main body, 5 ... Projection opening, 6 ... Discharge lamp.

Claims (3)

[Claims] 1. A translucent substrate provided in a light projecting opening of a lighting fixture body; coated on a surface of the translucent substrate facing a light source, the central portion being relatively thick, and the peripheral portion being thin. A cover for a lighting fixture, comprising: an ultraviolet absorbing film; 2. A lighting device main body is provided at a light projecting opening,
A soda lime glass substrate that has been strengthened; and an ultraviolet absorbing film that is applied to the surface of the glass substrate that faces the light source and that has a relatively thick central portion and a thin peripheral portion. Lighting fixture cover. 3. A luminaire main body having a light projecting opening; a discharge lamp provided in the luminaire main body; and a luminaire cover according to claim 1 or 2 disposed in the light projecting opening. An illuminating device comprising: