JPH03225702A - Lighting fixture - Google Patents

Abstract

PURPOSE:To lower the temperature on a reflecting surface side and prevent an optical multilayered film from being peeled-off by forming the optical multilayered film which permeates infrared rays and reflects visual rays on the surface of a reflector base formed of ceramics in a reflector disposed opposite to a lamp. CONSTITUTION:Of the lights emitted from a lamp 26 toward the reflecting surface 16 of a reflecting base 11 by lighting of the lamp 26, visual rays are reflected by the optical multilayered film 18 of the reflecting surface 16 and emitted in a desired radiating direction from the radiating opening 12 on the front. The infrared rays of the lights emitted from the lamp 26 are permeated through the optical multilayered film 18. The infrared rays permeated to the reflector base 11 is diffused followed by heat radiation by the reflector base 11 formed of a highly heat-conductive ceramics to suppress a temperature rise of the reflecting surface 16 of the reflector base 11. Further, as the optical multilayered film 18 has a thermal expansion coefficient approximate to that of the ceramics, and the surface of the ceramics is high in wettability, the peeling-off of the optical multilayered film can be prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a lighting device such as a spotlight or a floodlight, and is used, for example, in an indoor floodlight device for a store or a residence. related to things.

(Prior art) Conventionally, for example, a halogen lamp is used as a light source,
In lighting equipment such as spotlights that reflect the light from the lamp on the reflective surface of a reflector, the reflector is glass,
It is known that aluminum or the like is used as the substrate, and in the case of a glass substrate, it transmits infrared rays and reflects visible light, and in the case of an aluminum substrate, it has an optical multilayer film that absorbs infrared rays and reflects visible light. .

(Problems to be Solved by the Invention) In a reflector in which the reflector base is made of glass having a reflective surface on which an optical multilayer film is formed, thermal conductivity is low because of the glass, and heat is not diffused and dissipated. It has been difficult to miniaturize a device that uses a high-output lamp that emits a large amount of infrared rays because the reflector tends to become hot.

In addition, a reflector in which the reflector substrate is made of aluminum absorbs much of the infrared rays, resulting in high temperatures, and it is also difficult to miniaturize the reflector.

Furthermore, each of the reflective plates described above has a different coefficient of thermal expansion from the optical multilayer film, and there is a problem in that the optical multilayer film tends to peel off at high temperatures.

The present invention was made in view of the above problems, and since the reflector substrate has high thermal conductivity, the temperature on the reflective surface side can be lowered,
To provide a lighting fixture with good adhesion of an optical multilayer film, no peeling of the optical multilayer film even at high temperatures, a reflector that can be made smaller, and a lamp that can be made smaller even when a high-output lamp is used.

[Structure of the invention]

(Means for Solving the Problems) A lighting fixture of the present invention includes a lamp and a reflector disposed opposite to the lamp, and the reflector is attached to the surface of a reflector base formed of ceramic. It is made of an optical multilayer film that transmits infrared rays and reflects visible light.

(Function) In the lighting device of the present invention, visible light emitted from the lamp is reflected by the optical multilayer film of the reflector base, and infrared rays are transmitted and absorbed by the reflector base formed of ceramic. has good thermal conductivity and can suppress the temperature rise on the reflective surface side of the reflector, and the ceramic of the reflector base has a coefficient of thermal expansion similar to that of the optical multilayer film, and the ceramic surface has high wettability. It has good adhesion to the optical multilayer film, can withstand high temperatures, and can be made smaller even when using a high-output lamp.

(Example) The configuration of an example of the lighting fixture of the present invention will be described with respect to a spotlight.

In FIG. 1, reference numeral 11 denotes a reflector base body made of ceramic. The reflector base body 11 is formed in the shape of a parabolic body of revolution, and has an irradiation aperture 12 opened in the front surface. Further, a substantially cylindrical cylindrical portion 14 is integrally formed rearward from the center portion of the rear end of the reflector base 11 on the side opposite to the irradiation opening 12 .

Further, the reflective surface 16 on the inner surface of the reflector base 11 is formed into a smooth surface by polishing. As shown in FIG. 2, an optical multilayer film 18 is formed on this surface by alternately laminating, for example, titanium oxide (TiO2) and silicon oxide (SiO□).
is formed by vacuum evaporation.

Further, a lamp socket 21 is fitted into the cylindrical portion 14 and attached by adhesive or the like.

Then, a lamp 26 such as a halogen lamp serving as a light source is attached, and this lamp 26 is attached to the reflective surface of the base 11.
It is contained opposite to 6. This lamp 26 includes a base 27 that is attached to the lamp socket 21, and a base 27 that is attached to the lamp socket 21.
It consists of a bulb 28 made of translucent glass or the like fixed to the bulb, and a tungsten filament built into the bulb 28.

Next, the operation of this embodiment will be explained.

When the lamp 26 is turned on, visible light among the light emitted from the lamp 26 and directed toward the reflective surface 16 of the reflective plate base 11 is reflected by the optical multilayer film 18 of the reflective surface 16, and is emitted from the front irradiation aperture 12 to a desired direction. Emitted in the irradiation direction.

Of the light emitted from the lamp 26, infrared rays are transmitted through the optical multilayer film 18. The infrared rays transmitted to the reflector base 11 are diffused and dissipated by the reflector base 11 made of ceramic with good thermal conductivity, and the temperature rise of the reflective surface 16 of the reflector base 11 is suppressed.

When the reflector base 11 is made of white ceramic, an optical multilayer film 18 is formed as shown in FIG.
The transmitted light that has passed through and reached the reflector base 11 is scattered by diffuse reflection inside the reflector base 11, and the infrared rays are not focused and emitted from the irradiation aperture 12.

In addition, when the reflector base 11 is made of black ceramic, the optical multilayer film 18 as shown in FIG.
Of the light that has passed through and reached the reflective surface 16, infrared rays are absorbed by the reflector base 11, and the heat is diffused and radiated.

Furthermore, the optical multilayer film 18 formed on the reflector substrate 11 has a coefficient of thermal expansion similar to that of ceramic, and the surface of the ceramic has high wettability, so it has good adhesion with the optical multilayer film 18. There is no fear that the membrane 18 will peel off, it has excellent heat resistance, and even if a high-output lamp 26 is used, the device can be made smaller.

As described above, according to the configuration of this embodiment, the reflector base 11
has good thermal conductivity, so the temperature rise on the reflective surface 16 side of the reflector base 11 is reduced, and the reflector base 11 can be made smaller.
Moreover, the output of the lamp 26 can be increased.

In the above embodiment, a halogen lamp has been described as the lamp 2G, but the lamp is not limited to a halogen lamp, and various lamps such as a high-intensity discharge lamp can also be used.

Further, in the above embodiment, the lamp 26 is connected to the lamp socket 2.
1, as shown in FIG. It can also be made into an integrated type.

Furthermore, as shown in FIG. 6, the lamp 26 consists of only a bulb 28 made of glass or the like with a built-in filament.
The lamp 26 and the reflector base 11 can also be integrated by fitting the bulb 28 onto the top of the reflector base 11 and bonding it with cement 30.

〔Effect of the invention〕

According to the present invention, the reflector is formed with an optical multilayer film that transmits infrared rays and reflects visible light on the surface of the reflector base formed of ceramic, so that the visible light emitted from the lamp is absorbed by the optical While being reflected by the multilayer film, the infrared rays are transmitted and absorbed or internally diffused by the reflector base made of ceramic.The reflector base has good thermal conductivity and can suppress the temperature rise on the reflective surface side of the reflector. Furthermore, the ceramic of the reflector base has a coefficient of thermal expansion similar to that of the optical multilayer film, and the ceramic surface has high wettability, so it has good adhesion with the optical multilayer film, can withstand high temperatures, and can be used in high-output lamps. By using this method, it is possible to downsize the fixture, and it is possible to obtain lighting fixtures such as spotlights that have excellent durability and are inexpensive.

Figure 2 is an enlarged sectional view of a part of the reflector base as above, Figure 3 is
4 and 4 are explanatory views of the same as above, and FIGS. 5 and 6 are longitudinal sectional views of the lighting equipment showing other embodiments, respectively.

11.Reflector base, 12.Irradiation aperture, 16.Base 1
1 reflective surface, 18... optical multilayer film, 26... lamp.

"Consideration" 1 grave 11

Claims (1)

[Claims] (1) Comprising a lamp and a reflector disposed opposite to the lamp, the reflector having an optical multilayer film that transmits infrared rays and reflects visible light on the surface of a reflector base formed of ceramic. A lighting fixture characterized by a formed.