JPH0235402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in lighting equipment used in department stores, supermarkets, etc.

Conventionally, as shown in FIG. 1, a reflector 2 is installed inside a lighting fixture body 1 on the ceiling surface of a department store or a supermarket that has a relatively high ceiling, and a highly efficient high voltage is installed inside the reflector 2. There is a structure in which a heat-resistant glass 4 is provided in front of the light source for housing the discharge lamp 3, and an acrylic resin glove 5 is provided in front of the glass 4, which prevents glare from the lighting equipment and also serves as a mounting point for the equipment.

However, when a high-pressure discharge lamp with a large capacity is turned on, the temperature inside the lighting fixture increases due to heat generated by the discharge lamp.

For example, the diameter of the reflecting mirror 2 in Fig. 1 above is 43
cm, height is 20 cm and 250
When Watsuto's high-pressure sodium lamp was stored and turned on, the temperature at the center of the front of the acrylic resin glove was approximately 67 degrees.

Since acrylic resin gloves are normally used at about 57 degrees, the durability of acrylic resin gloves with the above-mentioned size is poor and cannot be used.

Therefore, in the present invention, a transparent acrylic resin coating that absorbs heat rays and protects the reflector is coated on the inner surface of the reflector that houses the light source, thereby absorbing heat rays and attaching a glove provided on the front surface of the reflector. To provide a lighting device which suppresses the rise in surface temperature, makes the lighting device compact, prevents premature deterioration of the globe, and is easy to manufacture and efficient.

The present invention will be explained below with reference to FIGS. 2 to 4. In Fig. 2, 1 is a box-shaped lighting fixture body;
Reference numeral 2 denotes a reflecting mirror housed inside the lighting device main body 1, and a transparent acrylic resin coating 6 mainly made of acrylic acid/methacrylic acid ester is coated on the inner surface. 3 is a light source located inside the reflecting mirror 2, which is a high-pressure discharge lamp; 5 is an acrylic resin globe provided in front of the reflecting mirror 2; 4 is the light source 3;
and the acrylic resin globe 5 is heat-resistant glass.

Next, an experimental example of a lighting fixture with the same structure will be explained. The size of the reflector 2 housed inside the lighting fixture body 1 is the same as the diameter of the conventional structure shown in Figure 1.
43 cm, height 20 cm,
When lit using a 250 watt high-pressure sodium lamp, the temperature at the center of the front of the acrylic resin glove 5 was approximately 55 deg, confirming that the glove was sufficiently usable.

Next, FIG. 3 shows the relationship between the thickness of the transparent acrylic resin coating on the inner surface of the reflecting mirror 2 and the temperature of the synthetic resin glove in the experimental example shown in FIG. 2.

As shown in the figure, as the thickness of the transparent acrylic resin coating increases, the heat ray absorption effect increases and the temperature of the glove surface decreases. When the thickness of the transparent acrylic resin coating becomes 16μ, the temperature of the glove surface becomes 57deg, and when the thickness becomes 25μ, the temperature of the glove surface becomes 55deg, and even if it is thicker than that, the heat absorption effect remains the same.

Next, other embodiments will be described.

As shown in FIG. 4, the surface glass provided between the light source 3 and the acrylic resin globe 5 is removed from the lighting fixture shown in FIG. 2, and the reflector 2 has a diameter of 43 cm and a height of 220 cm. When Watsuto's high-pressure sodium lamp was stored and turned on, the temperature at the center of the acrylic resin globe surface was approx.
55deg, and the results of the experiment confirmed that the gloves were sufficiently durable for use. The reason why the temperature rise can be suppressed to such a low level is because the transparent Acrys resin coating absorbs infrared rays generated from the light source.

The structure in which a transparent Acrys resin coating is applied to the inner surface of the reflector as described above can also be applied to a structure in which a light source with a large capacity is housed inside, with no globe on the front of the reflector and only glass on the front. This has the effect of keeping the temperature rise of the front glass low.

As described above, the present invention has a structure in which an acrylic resin coating with a thickness of 16 μm to 25 μm is coated on the inner surface of a reflecting mirror equipped with a light source, which serves both of absorbing heat rays and protecting the surface of the reflecting mirror. Therefore, it is possible to protect the surface of the reflecting mirror well, absorb heat rays, and suppress the rise in temperature of the acrylic resin glove provided in front of the reflecting mirror.

Furthermore, since heat rays can be absorbed, the reflecting mirror can be made compact, and deformation of the glove and early deterioration due to heat can be prevented.

Furthermore, the transparent Acrys resin coating on the inner surface of the reflecting mirror serves both to protect the reflecting mirror surface and to absorb heat rays, and has various advantages such as being able to be easily constructed by applying one layer, and is highly useful.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional lighting fixture, Figure 2 is a side view of a lighting fixture according to the present invention, and Figure 3 is the relationship between the film thickness on the inner surface of the reflector of the lighting fixture and the temperature in front of the globe in Figure 2. FIG. 4 is a diagram showing another embodiment of the lighting fixture according to the present invention. 1...Lighting equipment body, 2...Reflector, 3...Light source.

Claims (1)

[Claims] 1 Reflector 2 configured on a rotating curved surface and reflector 2
It has a light source 3 mounted inside the reflector 2, and a globe 5 provided in front of the reflector 2.
A lighting device characterized by having a layer of acrylic resin coating with a thickness of 16μ to 25μ that serves both of absorbing heat rays and protecting the surface of the reflecting mirror on the inner surface of the lighting device.