JP4032276B2 - Luminaire cover and luminaire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a translucent cover for a lighting fixture provided with a photocatalytic film and a lighting fixture using the same.
[Prior art]
Many lighting fixtures such as road lights, street lights and lamps optically apply high-pressure discharge lamps such as mercury lamps and metal halide lamps and fluorescent lamps to the reflectors fixed to the lighting fixtures. It arranges operatively and arranges and constitutes a translucent cover in the front of a lighting fixture main part.
[0002]
However, such a light source lamp has a large amount of light radiation including ultraviolet rays, and the translucent cover often transmits such ultraviolet rays. As such ultraviolet rays, there are many ultraviolet rays around 380 nm in particular. However, since they are wavelengths preferred by pests, especially in summer, pests such as Drosophila and mosquito are likely to be attracted, the landscape is harmed and the environment deteriorates. There is a risk of damage.
[0003]
On the other hand, by forming a photocatalyst film on at least the outer surface of a light-transmitting cover of a lighting fixture that is arranged outdoors, dirt attached to the outer surface of the light-transmitting cover can be decomposed and removed. For this reason, since the interval of cleaning of a translucent cover can be lengthened, it is known that there is an advantage that maintenance cost can be reduced.
[0004]
For this reason, Japanese Patent Application Laid-Open No. 11-224514 discloses a lighting apparatus in which a thin film mainly composed of a transparent metal oxide that suppresses an insecticidal action is formed on at least one surface of a translucent cover or an inner / outer surface, and an attractant A luminaire (conventional example 1) is described in which a titanium oxide film having a photocatalytic action is deposited on the outer surface of a thin film mainly composed of a transparent metal oxide that suppresses the action.
[0005]
Japanese Patent Application Laid-Open No. 10-275508 describes a lighting fixture (conventional example 2) configured by applying a photocatalytic film to the surface of a front glass whose light transmittance is reduced to 400 nm or less.
[Problems to be solved by the invention]
However, in the lighting fixtures disclosed in Conventional Example 1 and Conventional Example 2, the ultraviolet transmittance near 360 nm is almost suppressed. FIG. 5 shows the transmittance of the front glass of the lighting fixture described in Conventional Example 2. As is clear from FIG. 5, it can be seen that the transmittance of ultraviolet rays is almost suppressed, and in particular, only about 3% is transmitted around 360 nm. For this reason, even if a photocatalyst is applied to a translucent cover or the like of a lighting fixture, ultraviolet rays generated from the light source cannot reach the photocatalyst film. For this reason, since the self-cleaning function of the lighting fixture by the photocatalyst film generated by the ultraviolet rays from the light source cannot be utilized, it is not sufficient to decompose the dirt adhering to the lighting fixture, and the illumination intensity of the lighting is reduced or the maintenance of the fixture There was a problem such as becoming complicated.
[0006]
For this reason, the present invention reduces the worm action in the lighting fixture, does not reduce the applied photocatalytic action, maintains the fixture efficiency over a long period of time, and saves the maintenance of the fixture. An object of the present invention is to provide a light cover and a lighting fixture using the same.
[Means for achieving the object]
The cover for a luminaire according to the invention of claim 1 is formed on at least one surface of the translucent cover main body to be mounted on the light projection opening of the luminaire main body, and has a transmittance of 5 to 50 at 360 nm. %, An ultraviolet absorbing film composed mainly of a light-transmitting metal oxide whose transmittance at 380 nm is 85% or less; formed on the outer surface of the ultraviolet absorbing film or on the outer surface of the transparent cover body facing the ultraviolet absorbing film A photocatalytic film to be provided.
[0007]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0008]
The translucent cover main body refers to a state where the ultraviolet absorbing film and the photocatalyst film are removed from the translucent cover for a lighting fixture, in other words, a state before the ultraviolet absorbing film and the photocatalytic film are formed.
[0009]
The translucent cover body may be either transparent or light diffusive. In the case of transparency, one or both of the outer surface and the inner surface may be provided with light control means such as a prism, a lens, or a large number of convex portions or concave portions for light diffusion.
[0010]
Furthermore, the translucent cover main body can adopt any desired shape such as a rectangle or a circle, and the translucent cover main body has any structure as long as an instrument space is formed between the translucent cover main body and the luminaire main body. May be. For example, the plate shape which closes the front opening of a lighting fixture main body may be sufficient, and the shape which bulges forward from the front opening of a lighting fixture main body may be sufficient.
[0011]
The ultraviolet absorbing film is mainly composed of a light-transmitting metal oxide such as ZnO so that the transmittance at 360 nm is 5 to 50%, preferably 5 to 20%, and the transmittance at 380 nm is 85% or less, preferably 60% or less. An ultraviolet absorbing film is formed. For example, when ZnO is used, it is preferable that the particle size is about 10 to 50 nm, and further, the ultraviolet absorbing film having the transmittance as described above is formed by forming the film thickness to 100 to 1000 nm, preferably 150 to 500 nm. Can be formed.
[0012]
The photocatalytic film is a thin film formed of a metal oxide having a photocatalytic action. Here, examples of the metal oxide having a photocatalytic action include TiO ₂ , ZnO, WO ₃ , LaRhO ₃ , FeTiO ₃ , Fe ₂ O ₃ , CdFe ₂ O ₄ , SrTiO ₃ , CdSe, GaAs, GaP, and RuO _2. Or a mixed system of two or more kinds of fine particles. In particular, fine particles mainly composed of crystalline TiO _2, for example, those having an average particle diameter of about 5 to 70 nm, and further anatase type TiO ₂ are preferable. The photocatalytic film has a thickness of 100 to 300 nm, preferably 150 to 200 nm. Further, if the entire photocatalyst film contains at least one selected from oxides of P, B, Al, Sb, Sn, and K, the expansion coefficient of the photocatalyst film becomes close to the expansion coefficient of the glass substrate. , Peeling resistance is improved.
[0013]
The method for applying the ultraviolet absorbing film and the photocatalyst film is not particularly limited, and can be appropriately selected depending on the shape of the translucent cover main body such as spin coat, dip coat, roll coat, spray coat and the like.
[0014]
The photocatalytic film can be formed either on the outer surface of the ultraviolet absorbing film or on the outer surface of the translucent cover body facing the ultraviolet absorbing film. However, by forming the photocatalyst film so as to be the outer surface of the cover for the luminaire, dirt attached from the outside of the luminaire can be removed by the self-cleaning effect of the photocatalyst.
[0015]
Further, in the case where the photocatalytic film is directly provided on the surface of the translucent cover main body, a photocatalytic film may be provided directly, but an SiO ₂ layer is interposed between the surface of the translucent cover main body and the photocatalytic film. It is allowed to intervene and arrange as a stratum.
[0016]
In the case where the photocatalyst film is provided on the outer surface of the UV absorbing film, the photocatalyst film may be provided directly on the outer surface of the UV absorbing film. However, SiO ₂ or the like is interposed between the UV absorbing film and the photocatalyst film. It is also acceptable to provide a formation. Or when the cover for lighting equipment is damaged, a fluororesin is interposed between the translucent cover body and the photocatalyst film to prevent the cover from scattering, or a metal oxide powder having a photocatalytic effect is mixed with the fluororesin material. It is also acceptable to form it as a film.
[0017]
According to the first aspect of the present invention, since the ultraviolet absorbing film is formed on the translucent cover body so that the photocatalytic film can allow ultraviolet light having a photocatalytic action to pass through 360 nm, the photocatalytic film is generated from the light source. Therefore, it is possible to provide a cover for a lighting apparatus that can reduce the 380 nm preferred by a pest while obtaining a photocatalytic effect.
[0018]
The invention according to claim 2 is a translucent cover main body mounted on a light projection opening of a luminaire main body; and an ultraviolet absorbing film formed on at least one surface of the translucent cover main body and mainly composed of a translucent metal oxide. And a photocatalyst film formed on the outer surface of the ultraviolet absorbing film or on the outer surface of the translucent cover main body facing the ultraviolet absorbing film, and having a transmittance of 5 at 360 nm. ˜20%, 380 nm transmittance is 70% or less, and total visible light transmittance is 75% or more.
[0019]
According to the second aspect of the present invention, a 360 nm ultraviolet ray can be transmitted to the surface of the photocatalyst film, and therefore a cover for a lighting apparatus that can reduce the 380 nm ultraviolet ray preferred by pests without interfering with the effect of the photocatalytic action is provided. can do.
[0020]
According to a third aspect of the present invention, there is provided a lighting fixture main body having a light projection opening; a light source lamp disposed inside the lighting fixture main body; and reflecting light emitted from the light source lamp to form a desired light distribution. A reflector provided inside the luminaire main body; and a translucent cover for a luminaire according to claim 1, wherein the reflector is disposed so that at least the photocatalytic film is located outside and covers the light projection opening. is doing.
[0021]
The luminaire main body may have any structure as long as it has a light projection opening.
Further, a frame made of metal or synthetic resin may be provided at the peripheral edge as a part of the light-transmitting cover for lighting fixtures in order to attach the light-transmitting cover for lighting fixtures to the lamp body.
[0022]
The light source lamp can be arbitrarily selected from various known light source lamps. For example, a low-pressure discharge lamp such as a fluorescent lamp and a low-pressure sodium lamp, a high-pressure sodium lamp, a high-pressure discharge lamp such as a metal halide lamp and a mercury lamp, and a light bulb can be used.
[0023]
The reflector is used to form a desired light distribution, and various shapes and structures can be adopted depending on the type of light source lamp and the desired light distribution. For example, a reflector having a single structure or a reflector divided into a plurality of parts can be used. Further, if necessary, the inner surface of the luminaire main body can act as a reflector. Furthermore, the surface of the reflector may be either a mirror surface or a light diffusing surface such as a white surface. Further, the reflector may be mounted on either side of the luminaire main body and the luminaire translucent cover. In addition, it is allowed to adopt a configuration in which the light source lamp can be mounted on the reflector.
[0024]
The photocatalytic film of the translucent cover for lighting fixtures is arranged on a surface that does not face the light source lamp arranged inside the lighting fixture main body. That is, the photocatalytic film is formed on the outer surface in a state where the light-transmitting cover is attached to the lighting fixture. By comprising in this way, the stain | pollution | contamination adhering to the outer surface of the translucent cover of a lighting fixture by the ultraviolet-ray which the light source lamp accommodated in the lighting fixture generate | occur | produces can be decomposed | disassembled and removed.
[0025]
According to the invention of claim 3, the translucent light for illuminating equipment that can reduce the insect attracting action, maintain the equipment efficiency for a long time without reducing the applied photocatalytic action, and can save the maintenance of the equipment. It is an object to provide a sex cover and a lighting apparatus using the same.
DETAILED DESCRIPTION OF THE INVENTION
The cover for lighting fixtures which is 1st Embodiment of this invention is demonstrated with reference to FIG. FIG. 1 is a cross-sectional view of a cover 10 for a lighting fixture. The translucent cover main body 1 is formed by forming a borosilicate glass into a disk shape having a thickness of 4 mm and a diameter of 400 mm. On one surface of the translucent cover body 1, an ultraviolet absorption film 2 mainly composed of zinc oxide is formed. A photocatalytic film 3 mainly composed of titanium oxide is formed on the surface of the translucent cover main body 1 facing the ultraviolet absorbing film 2.
[0026]
When the ultraviolet absorbing film 2 made of zinc oxide is formed, the glass substrate 1 is rotated at a speed of 1200 rpm, and a solvent mixed with fine particles of zinc oxide, silica, zirconia, etc. is dropped from the center of the glass substrate 1 and spin coated. The ultraviolet absorbing film 2 having a film thickness of 200 to 500 nm and a film hardness of 2 to 4H is formed by forming the film by the method and then heating at 500 ° C.
[0027]
Next, the process of forming the photocatalyst film 3 on the opposite side of the ultraviolet absorbing film 2 will be described. The glass substrate 1 on which the ultraviolet absorbing film 2 is formed is inverted and formed by a spin coating method in the same manner as the ultraviolet absorbing film 2 is formed. As the photocatalyst solvent, a mixture of titanium oxide having a particle diameter of 5 to 30 nm and silica as a binder is used, and the glass substrate 1 is rotated at 1200 rpm to form a film. Then, the photocatalytic thin film 3 having a film thickness of 100 to 200 nm and a film hardness of 3 to 4H was formed by heating at 350 ° C.
[0028]
The ultraviolet and visible light transmittances thus formed in each step are shown in FIG. In FIG. 2, what is represented by A is the transmittance of the glass substrate 1 formed of borosilicate glass, B is the transmittance when the glass substrate 1 is provided with the ultraviolet absorbing film 2, and C is the transmittance of the glass substrate 1. The transmittance in a state where the ultraviolet absorbing film 2 is provided on one side and the photocatalytic thin film 3 is provided on the opposite side is shown.
[0029]
It can be seen that ultraviolet rays having a wavelength of 400 nm or less are transmitted as shown in A by using borosilicate glass for the glass substrate 1. Borosilicate glass is often used for the front glass of a lighting fixture because it has an excellent heat resistance effect and can sufficiently withstand the heat of a light source incorporated in the lighting fixture. Moreover, since it transmits ultraviolet rays, when a photocatalytic film is formed on the outer surface of the cover 10 for a lighting fixture, it is possible to make the ultraviolet rays of 360 nm reach the photocatalytic film. For this reason, the self-cleaning effect of a photocatalyst can be functioned.
[0030]
According to the transmittance B in the state in which the ultraviolet ray absorbing film is formed on the glass substrate, the transmittance around 380 nm preferred by insects is 85% or less, and the attracting action of the insects is reduced and the approaching of the insects is reduced. is doing. Moreover, since the transmittance | permeability of 360 nm is about 15%, it turns out that the ultraviolet-ray near 360 nm is permeate | transmitted from the light source, and reaches the photocatalyst film | membrane provided in the outer side. The photocatalytic film has a self-cleaning function caused by the ultraviolet rays around 360 nm that are thus reached.
[0031]
Like the transmittance shown in C, the transmittance around 380 nm is further reduced by further applying a photocatalytic film. As a result, the transmissivity of the translucent cover near 380 nm is 60% or less, so that the attracting action of the pests can be further reduced and the approach of the pests can be reduced. Moreover, since the photocatalyst film is applied, there is an effect that dirt adhering to the translucent cover can be decomposed. In this state, the average visible light transmittance is 80% or more, and high instrument efficiency can be maintained over a long period of time.
[0032]
Next, the cover for lighting equipment which is 2nd Embodiment of this invention is demonstrated with reference to FIG. Note that the same parts as those in FIG. On one surface of the translucent cover main body 1, an ultraviolet absorbing film 2 mainly composed of zinc oxide is formed in a thickness of 200 to 500 nm. A photocatalytic film 3 mainly composed of titanium oxide is formed on the outer surface of the ultraviolet absorbing film 2 to a thickness of 100 to 200 nm. The refractive indexes of the ultraviolet absorbing film 2 and the photocatalyst 3 are 2.1 and 2.2, respectively. For this reason, by forming the film thickness as described above, the transmittance in the vicinity of 550 nm, which has a particularly high non-visibility curve, is improved, and the transmittance of the entire visible light can be 80% or more.
[0033]
When the photocatalytic film 3 is formed on the outer surface of the ultraviolet absorbing film 2, it is desirable that the refractive indexes of both films are substantially equal, and the total thickness of both films is 100 to 200 nm. By forming in this way, it is possible to form the translucent cover 10 that does not lower the transmittance at 550 nm, which is the peak of the relative visibility curve, due to interference or the like.
[0034]
Next, the lighting fixture which is 3rd Embodiment of this invention is demonstrated with reference to FIG. FIG. 4 is an example of a projector using the lighting fixture cover 10 of the first embodiment as a front glass. A metal halide lamp 12 is housed inside the fixture body 11, and a lighting fixture cover 10 is attached to the fixture body 11 via a packing (not shown) on the light projection opening side. The inner surface of the instrument body 11 is provided with a reflective surface so that the metal halide lamp 12 is efficiently directed to the light projection opening side. Moreover, the attachment metal fitting 13 is attached to the neck part of the instrument main body 11, and it can be attached so that the instrument main body 11 may be installed and desired light distribution will be achieved.
[0035]
When the lighting fixture cover 10 is attached to the fixture body 11, the photocatalytic film must be applied to the outside of the surface facing the light source. By providing the photocatalyst film on the outside, dirt on the outside of the lighting fixture can be decomposed and removed by ultraviolet rays transmitted from the light source, so that it is possible to provide a lighting fixture capable of maintaining the fixture efficiency for a long period of time. Moreover, since the ultraviolet rays preferred by pests are also cut, it is possible to provide a lighting apparatus that can reduce the approach of the pests.
【The invention's effect】
According to the first aspect of the present invention, since the ultraviolet ray necessary for the photocatalyst film is transmitted through the ultraviolet absorbing film without cutting all the ultraviolet rays necessary for the self-cleaning function of the photocatalyst, the dirt adhering to the lighting fixture is decomposed. Therefore, it is possible to provide a cover for a lighting apparatus that can be removed and that does not allow the pests to approach because the ultraviolet rays preferred by the pests are reduced.
[0036]
According to the invention of claim 2, there is provided a lighting fixture cover capable of ensuring visible light transmittance while sufficiently wearing a self-cleaning function of a photocatalyst and capable of sufficiently cutting off ultraviolet rays preferred by pests as a lighting fixture cover. Can be provided.
[0037]
According to the invention of claim 3, dirt attached to the outer surface of the luminaire cover can be decomposed and removed using ultraviolet rays generated from the light source, so that the efficiency of the appliance can be maintained over a long period of time, and pests can be reduced. A lighting device that can be provided can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a lighting equipment cover according to a first embodiment of the present invention.
FIG. 2 shows the illumination cover and the spectral transmittance in each step.
FIG. 3 is a cross-sectional view of a lighting fixture cover according to a second embodiment of the present invention.
FIG. 4 is a perspective view of a lighting fixture according to a third embodiment of the present invention.
FIG. 5 is a diagram showing the transmittance of a naked child on the front surface of a conventional low sensation lighting apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cover body 2 for lighting fixtures ... UV absorption film 3 ... Photocatalyst film 10 ... Cover for lighting fixtures 11 ... Lighting fixture body 12 ... Metal halide lamp

Claims (3)

A translucent cover main body mounted on the light projection opening of the luminaire main body;
An ultraviolet absorbing film mainly composed of a translucent metal oxide formed on at least one surface of the translucent cover main body and having a transmittance of 360 nm of 5 to 50% and a transmittance of 380 nm of 85% or less;
A photocatalytic film formed on the outer surface of the ultraviolet absorbing film or on the outer surface of the translucent cover body facing the ultraviolet absorbing film;
The cover for lighting fixtures characterized by comprising. A translucent cover main body mounted on the light projection opening of the luminaire main body;
An ultraviolet-absorbing film formed on at least one surface of the translucent cover body and mainly composed of translucent metal oxide;
A photocatalytic film formed on the outer surface of the ultraviolet absorbing film or on the outer surface of the translucent cover body facing the ultraviolet absorbing film;
A luminaire having a transmittance of 360 nm of 5 to 20%, a transmittance of 380 nm of 70% or less, and a total visible light transmittance of 75% or more. Cover. A lighting fixture body with a projection opening;
A light source lamp disposed inside the luminaire body;
A reflector provided inside the luminaire body so as to reflect the light emitted from the light source lamp to form a desired light distribution;
The translucent cover for a lighting fixture according to claim 1, wherein the translucent cover is disposed so that at least the photocatalytic film is located outside and covers the light projection opening;
The lighting fixture characterized by comprising.

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