JPH0589710A - Moisture-proof lighting equipment - Google Patents

Abstract

PURPOSE:To provide a moisture-proof lighting equipment usable for a long time even in high temperature and high moisture atmosphere which has a reflecting plate for reflecting only visual rays. CONSTITUTION:On the reflecting plate 2 of a lighting equipment having a light absorbing layer 3 for absorbing infrared rays and ultraviolet rays and a reflecting layer 4 for reflecting visual rays on the inside surface of the metal base plate 2 so that the infrared rays and ultraviolet rays are removed from the rays from a lamp 5, and only the visual rays are reflected so as to be usable, a glassy layer 8 having a thickness of 0.5mum or more and less than 5mum is further formed so as to cover the whole layers. A reflector 1 consisting of the metal base plate 2 is never corroded even if it becomes high temperature by the effect of infrared rays and continuously used for a long time in a place of high moisture such as a plant factory, and it can be effectively used for a long time.

Description

Detailed Description of the Invention

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-proof luminaire whose reflection efficiency is less likely to drop even in a hot and humid atmosphere.

[0003]

2. Description of the Related Art When using a lighting apparatus, it is widely desired to remove infrared rays and ultraviolet rays, which have various effects on human bodies, animals and plants, and various articles, and to use only visible rays.

Conventionally, a technique for obtaining desired lamp characteristics by providing an infrared reflection film composed of multiple interference films on the surface of the arc tube or outer tube of a halogen lamp which emits relatively little ultraviolet light has been widely practiced. .. Further, for example, Japanese Patent Application Laid-Open No. 59-101757 discloses a high pressure discharge lamp (HID lamp) in which a multiple interference film is formed to remove infrared rays and ultraviolet rays.

On the other hand, it is widely practiced to combine a halogen lamp and a reflector or a reflector to form an infrared absorbing film on the inner surface of the reflector or the reflector.

Here, FIG. 3 is a schematic explanatory view of the luminaire. On the inner surface of the aluminum metal substrate 2 of the reflector 1, a heat absorbing layer 3 and a visible light reflecting infrared ray transmitting film 4 such as an oxide multiple interference film are formed. Then, when light is emitted from the lamp 5, the visible light is reflected by the visible light reflecting infrared ray transmissive film 4 and used as a light ray, and the infrared ray is absorbed and emitted to the upper portion as heat.

Since the reflector 1 using the metal substrate 2 made of aluminum as described above is often used in a relatively large facility, the amount of electric power of the light source used here is inevitably large. Therefore, the reflector 1 absorbs a large amount of radiation and transfers the heat to the back side of the reflector 1, so that the temperature becomes considerably high.

[0008]

According to the method of providing the infrared absorbing film on the conventional lamp itself as described above, the structure becomes more complicated than the ordinary lamp 5, resulting in an increase in cost.
Further, when the life of the lamp 5 is reached, the infrared reflection film cannot be reused, which is very uneconomical.

On the other hand, according to the method of forming the heat-absorbing layer and the visible-light-reflecting infrared-transparent film on the inner surface of the above-mentioned reflector or the reflecting plate, since the visible-light-reflecting infrared-transparent film is extremely thin, the place of use When the humidity is high, the metal plate itself is apt to corrode due to high temperature and high humidity, and the reflection efficiency is immediately lowered.

The present invention has been made in view of the above-mentioned problems, and is a reflector capable of sufficiently absorbing infrared rays and ultraviolet rays and effectively reflecting visible rays even when used for a long time in a high humidity atmosphere. It is an object of the present invention to provide a moisture-proof lighting fixture having a.

[Configuration of Invention]

[0012]

A moisture-proof lighting fixture of the present invention comprises a reflector and a light source provided so as to optically oppose the reflector, and the reflector is a metal substrate and Infrared formed on the surface of the metal substrate, a multilayer film consisting of a light-absorbing layer that absorbs ultraviolet rays and a reflective layer that reflects visible light,
A glassy material vitreous layer having a thickness of 0.5 μm or more and 5 μm or less is formed on the surface of this multilayer film.

[0013]

In the moisture-proof lighting apparatus of the present invention, when the light source is turned on, infrared rays and ultraviolet rays are absorbed by the light absorption layer formed inside the reflection plate. On the other hand, visible light is reflected by the reflective layer and used as illumination light. At this time, the reflection plate absorbs infrared rays, so the temperature becomes considerably high, but since a layer of glassy substance with strong corrosion resistance is provided, corrosion does not occur even if it is used for a long time in a high humidity atmosphere, Little decrease in efficiency.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment according to the present invention will be described with reference to FIGS. It should be noted that parts corresponding to those of the conventional example shown in FIG.

FIG. 1 is a schematic explanatory view of a moisture-proof lighting fixture, and FIG. 2 shows a positional relationship between a lamp as a light source and a reflector.

As shown in FIG. 2, the metal substrate 2 of the reflector 1 is made of aluminum metal having a thickness of 1.2 mm and has an opening diameter of 4 mm.
It is in the shape of a rotating body having an opening of a lower surface of 00 mm and a height of 390 mm, and the base socket 6 is mounted on the upper portion of the reflector 1. Then, the 400 W high pressure sodium lamp 5 is attached to the base socket 6. Inside the reflector 1, a visible light reflecting infrared ray transmitting film 4 including a heat absorbing layer 3, a light absorbing layer such as an oxidation multiple interference film, and a reflecting layer is formed as in FIG.

The heat absorbing layer 3 is made of a light absorbing metal oxide film, and the visible light reflecting / infrared transmitting film 4 having a thickness of 0.3 μm is composed of SiO ₂ (silicon oxide) -TiO _2.
2 (titanium oxide) type multilayer film consisting of 21 layers in total,
The total thickness of the film is 1.2 μm. Each layer is formed by a vacuum vapor deposition method of SiO ₂ —TiO ₂ by a large vacuum vapor deposition apparatus (not shown) capable of accommodating the reflector 1.

The visible light reflection / infrared transmission film 4 is a multiple interference film, selectively reflects only visible light rays, transmits infrared rays well, and is formed on the inside of the visible light reflection / infrared transmission film 4. The absorption layer 3 efficiently absorbs infrared rays. On the other hand, ultraviolet rays are also efficiently absorbed by the SiO ₂ —TiO ₂ multiple interference film.

The visible light-reflecting infrared ray transmitting film 4
The glassy layer 8 is provided on the surface of the. This glassy layer 8 is N
a ₂ O (sodium oxide) as a main component, 1 mol of an alkali oxide, 4 mol of SiO ₂ water glass is applied by flow coating to uniformly coat the surface of the visible light reflecting infrared ray transmissive film 4, and after natural drying 180 It was heat-treated in air at 0 ° C. for 10 minutes and had a thickness of 0.9 μm.

According to the experiment, when the thickness of the vitreous layer 8 exceeds 20 μm, fine cracks are formed regardless of the firing / cooling conditions. Moreover, beyond 5 μm,
When the film thickness was less than 20 μm, cracks occurred with a certain probability due to factors such as coating conditions, drying conditions, reflection plate curvature, and heat treatment conditions. On the other hand, in the case of 5 μm or less, an ideal vitreous layer 8 free from cracks could be obtained regardless of the heat treatment conditions. Therefore, it is necessary to cover the entire exposed surface of the reflector 1 with the vitreous layer 8. From this viewpoint, it is desirable that the water glass liquid applied has sufficient fluidity, and the film thickness after firing is inevitable. Is thin, and about 1 μm is most preferable.

However, it is technically difficult to cover the entire vitreous layer 8 with a uniform film thickness because of the shape of the device and the positional conditions after application until it is naturally dried. In some cases, the vitreous layer 8 was hardly left during firing. Therefore, from this point, the glassy layer 8 needs to be at least 0.5 μm or more.

The conventional moisture-proof lighting fixture thus formed and the moisture-proof lighting fixture coated with the vitreous layer 8 are installed in the room in which the 400 W high-pressure sodium lamp 5 is mounted and the humidity is 80%. The test was conducted.

As a result, it was observed that the conventional moisture-proof lighting fixture had a remarkable efficiency drop of 40% in the initial value ratio of illuminance of the lamp after 12 months of usage and 3000 hours of lamp lighting. This was due to the deterioration of the reflection performance of the reflector 1. Furthermore, when disassembling and examining this device, it was yellowish-white spots with a diameter of about 3
There were many spots of mm. At this center, the diameter is 0.
There were always 2 mm aluminum hydroxide crystals in the form of nuclei.

The core portion is SiO ₂ --Ti.
It is not covered with the visible light reflecting infrared ray transmitting film 4 of O ₂ ,
The aluminum, which is the metal substrate 2, was chemically changed to Al (OH) ₃ under the use condition of high temperature and high humidity. The spots were grown around the nucleated portion by further absorbing moisture in the atmosphere.

The large number of spots were not uniform in size and shape, and the deteriorated portion gradually expanded.

On the other hand, the moisture-proof luminaire provided with the glass layer 8 of 0.9 μm was used for 12 months as in the above experimental example.
The lamp was used for 3000 hours. The illuminance of the lighting equipment was -15% of the initial value ratio. When the reflector 1 was thoroughly wiped with a damp cotton cloth, the illuminance of the lamp was restored to an initial value ratio of -5%. In the case of the conventional lighting fixture, the initial value ratio was −32%, which means that the decrease in illuminance was remarkably improved. Considering the deterioration of the lamp itself and the measurement accuracy, it is considered that the reflector 1 was hardly deteriorated, and the stain-like foreign matter was not recognized at all, and the appearance of the reflector 1 did not change at all.

The above results show that the inner surface of the reflector 1 covered with the glassy layer 8 of the moisture-proof luminaire according to the embodiment of the present invention is compared with the inner surface of the reflector 1 of the conventional luminaire. It shows that the condition is smooth, and that it is possible to easily remove the stains of the fine particles of adhered substances such as fine dust and dust.

As a method of realizing the embodiment of the present invention,
Water glass was applied as a liquid having an appropriate viscosity by flow coating to cover the inner surface, and naturally dried and baked to form a glassy layer 8. The ratio of the components of the water glass was solid content 1 including Na ₂ O and SiO ₂ to water 10 (weight ratio). As a matter of course, the viscosity decreases as the amount of water decreases, and a thinner vitreous layer 8 is obtained. Therefore, a desired film thickness can be formed by adjusting the amount of water with respect to the solid content. Moreover, the thick glassy layer 8 can be formed by repeated coating.

What is important in forming the glassy layer 8 is to cover the entire inner surface of the reflector 1 with the glassy layer 8 which is not cracked. If this condition can be satisfied, another method may be used. Good. For example, it may be applied by a dipping method, brush painting, or spraying with a spray. Even if a thin film mainly composed of SiO ₂ is formed by vacuum evaporation, the thickness is 0.5.
The same effect can be obtained as long as it exceeds μm. Therefore, it does not have to be an alkali part which is a component of water glass as long as it is glassy.

The lamp (light source) 5 of this luminaire can be used as either a halogen lamp or a high pressure discharge lamp (HID lamp).

[0031]

According to the moisture-proof luminaire of the present invention, the corrosion resistance of the reflector is improved even when it is used for a long time in a hot and humid place and a place where high illuminance is required. Good and illuminance can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a moisture-proof lighting fixture of the present invention.

FIG. 2 is an explanatory diagram showing an outline of the arrangement of a light source (lamp) and a reflector in the moisture-proof lighting fixture.

FIG. 3 is an explanatory diagram showing an outline of a conventional lighting fixture.

[Explanation of symbols]

 1 Reflector 2 Metal Substrate 4 Visible Ray Reflecting Infrared Transmitting Film as Multilayer Film 5 Lamp as Light Source 8 Glassy Layer

Claims (1)

[Claims] 1. A reflector and a light source provided so as to be optically opposed to the reflector, wherein the reflector absorbs infrared rays and ultraviolet rays formed on the surface of the metal substrate. And a vitreous layer having a thickness of 0.5 micrometer or more and 5 micrometers or less formed on the surface of the multilayer film. A moisture-proof lighting fixture characterized by the above.