JPH0236164Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a reflector for a lighting device having a selective reflection film formed on its inner surface.

[Background Art] As shown in FIGS. 6a and 6b, a lamp 2 made of a halogen lamp with a filament 1 close to a point is used, and the reflector body 3 is axially symmetrical and bowl-shaped. A reflector for a lighting device in which a selective reflection film 4 is deposited on the inner surface of the reflector body 3 reflects visible light x in the range of 400 to 800 nm out of the light rays emitted from the lamp 2 at each position on the reflective surface, and also reflects heat rays. It was possible to transmit y and reflect visible light without color unevenness. The lamp 2 is inserted into the reflector body 3 through a hole 5 opened at the bottom thereof, and is attached to a socket 6 outside the reflector body 3. FIG. 7 shows the spectral reflectance distribution characteristics of the selective reflection film 4 used.

On the other hand, as shown in Figure 8a and b, in the reflector of a lighting fixture using a double-ended type halogen lamp, a glass reflector main body 3a is arranged parallel to both sides of the lamp 2, and these reflections are Mirrors in which a selective reflection film 4 is formed on the inner surface of a mirror body 3a have been conventionally provided. In this conventional example, the filament 1 of the lamp 2 is linear, and therefore, at a certain point A on the reflecting surface of the reflecting mirror body 3a, the reflection characteristics of the light x ₁ emitted from one end F ₁ of the filament 1 are as shown in FIG. If so, the light x ₂ emitted from the other end F ₂ is the light x ₁ emitted from the one end F ₁
Since there is a difference a between the angle of incidence and the reflection characteristic shown in Figure 9B, the distributed reflectance curve shifts to the short wavelength side and the red part of visible light is transmitted.
As shown in FIG. 10, there was a problem in that the shaded area around the pattern on the irradiated surface turned blue, resulting in color unevenness.

[Purpose of the invention] This invention was created in view of the above-mentioned problems, and its purpose is to transmit heat rays even when using a linear light source, and to reflect visible light without color unevenness. We are here to provide you with the lighting equipment you need.

[Disclosure of the invention] The present invention is a reflection lighting device in which a linear light source is placed in a space surrounded by a reflecting mirror body, and a selective reflection film that transmits heat rays and reflects visible light is formed on the inner surface of the reflecting mirror body. Selective reflection in which the wavelength of the falling position of the spectral reflectance curve at the same reflection point of the light emitted from both ends of a linear light source in a mirror is approximately equal to or greater than the wavelength of the boundary position between the visible light region and the infrared region. It is characterized in that a film is formed on the inner surface of the reflecting mirror.

The present invention will be explained below with reference to examples.

Example 1 Figures 1a and b show a lighting fixture according to this example, which is structurally exactly the same as Figures 8a and b, except that a selective reflection film 4 is deposited on the inner surface of the reflector body 3a. The characteristics are different from those of the conventional example. In other words, both ends F ₁ of the filament 1 of the lamp 2 which is a linear light source,
_{F ​ ​ ​} The characteristics of the selective reflection film 4 are set so that the position is near the maximum wavelength of visible light as shown in FIG.

However, in the case of reflection by light x ₁ ', a part of the heat ray y is reflected to some extent as shown in the spectral reflectance curve A' in Figure 2, reducing the heat ray cut rate.
Even if there is a deviation in the reflectance curve _B ' of It can reflect visible light.

FIG. 3 is a diagram showing the relationship between the wavelength and energy of reflected light rays. As can be seen from this diagram, in this example, there is a peak in the infrared region as shown by the two curves, and in the case of a point light source ( The heat ray cut rate is somewhat lower than that of curve C). Note that the curve E shows the energy of the halogen lamp.

Embodiment 2 In this embodiment, as shown in FIG. 4, black louvers 7 are provided at inner positions of both ends of the filament 1 of the lamp 2, and the radiation position of light incident on the same reflection point is restricted by the louvers 7. For example, the light incident on point A of the reflective surface is one end of filament 1.
Light x ₁ ' coming out from F ₁ and light coming out from the position of louver 7
x ₂ '', and the difference in incident angle is a ₁ , which is smaller than a in Example 1. In other words, the deviation in the spectral reflectance distribution becomes smaller. As a result, reflections are covered up to the infrared region. As shown in Fig. 4, the range is smaller than a when there is no louver 7, b,
Accordingly, the heat ray cutting rate is improved and the number of vapor deposited layers of the selective reflection film 4 can be reduced.

[Effect of the invention] The invention provides a reflector for a lighting equipment configured as described above, in which the wavelength of the falling position of the spectral reflectance curve at the same reflection point of the light emitted from both ends of the linear light source is visible for both lights. Since a selective reflection film is formed on the inner surface of the reflector so that the wavelength is approximately equal to or longer than the wavelength at the boundary between the optical region and the infrared region, it is possible to reflect visible light without color unevenness even from a linear light source, and it is possible to reflect heat rays from the reflector. It can be transmitted to the outside of the main body and has the effect of not having a thermal effect on the irradiated object.

[Brief explanation of drawings]

Fig. 1a is a cross-sectional view of the first embodiment of the present invention as seen from the front, Fig. 1b is a side view of the same, Fig. 2 is an explanatory diagram of the spectral reflectance distribution characteristics of the above, and Fig. 3 is a diagram showing the wavelength and An explanatory diagram of the energy relationship. Figure 4 is a cross-sectional view of the second embodiment of the present invention as seen from the front. Figure 5 is a comparative diagram of the same as the above and the first embodiment. Figure 6a is a lighting fixture in the case of a point light source. 6b is a bottom view of the same as above, FIG. 7 is an explanatory diagram of spectral reflectance distribution characteristics of the same as above, FIG. 8a is a sectional view of the conventional example as seen from the front, FIG. b is a side view of the same as above, FIG. 9 is an explanatory diagram of spectral reflectance distribution characteristics of the same as above, and FIG. 10 is an explanatory diagram of operation of same as above, 1 is a filament, 2 is a lamp,
3a is a reflecting mirror body, and 4 is a selective reflection film.

Claims (1)

[Scope of utility model registration request] In a reflector for a lighting device, a linear light source is placed in a space surrounded by a reflector body, and a selective reflection film is formed on the inner surface of the reflector body to transmit heat rays and reflect visible light. A selective reflection film is formed on the inner surface of the reflector so that the wavelength of the falling position of the spectral reflectance curve at the same reflection point for both lights is approximately equal to or greater than the wavelength of the boundary position between the visible light region and the infrared region. A reflector for a lighting equipment characterized by: