JPH0447850Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a lighting fixture equipped with a plurality of straight tube fluorescent lamps.

[Background Art] Conventionally, this type of lighting equipment is
As shown in the figure, the box-shaped main body 1 opens downward.
A plurality of straight tube fluorescent lamps 2 are arranged in a row within the main body 1, and a V-shaped reflector 3 disposed between each fluorescent lamp 2 along the longitudinal direction of the fluorescent lamp 2 is attached to the upper bottom surface 1a of the main body 1.
A lighting circuit consisting of a ballast 4 and a glow lamp 5 was attached to a portion of the upper bottom surface 1a of the main body 1 covered by the reflector 3. The fluorescent lamp 2 has two tubes connected at one end and a discharge electrode arranged at the other end of each tube to form a U-shaped discharge path, and the other end is connected to the lamp socket. 10, and one end is attached to the lamp support spring 1.
1 is suspended from the upper bottom surface 1a of the main body 1. Further, a louver 13 is provided at the lower opening of the main body 1 . By the way, in such a conventional example, a heat sink 14 is attached to the ballast 4 in order to prevent the temperature of the ballast 4, which is a heat generating component, from rising, but this poses the problem of increased cost. Moreover, the reflector plate 3 is heated by heat radiation from the ballast 4 or heat conduction through the upper bottom surface 1a of the main body 1, and the tube wall temperature, which is the coldest point of the fluorescent lamp 2, becomes high. There was a problem in that the luminous flux decreased and the appliance efficiency (electricity-light conversion efficiency) decreased. In other words, the relationship between the temperature at the coldest point of the fluorescent lamp 2 and the luminous flux is as shown in FIG. However, there was a problem that the efficiency of the equipment decreased.

[Purpose of the invention] The present invention was made in view of the above points, and its purpose is to reduce the cost by eliminating the need for a heat sink to prevent the temperature of the ballast from rising.
Moreover, it is an object of the present invention to provide a lighting fixture that can prevent a decrease in the efficiency of the fixture due to heat generated by the ballast.

[Disclosure of the invention] (Embodiment) Fig. 1 shows an embodiment of the invention, in which a plurality of straight tube fluorescent lamps are arranged in a row in a box-shaped main body 1 that opens downward, and each fluorescent lamp is A V-shaped reflector 3 disposed between the lamps 2 along the longitudinal direction of the fluorescent lamp 2 is suspended from the upper base 1a of the main body 1, and is covered by the reflector 3 on the upper base 1a of the main body 1. In a lighting device in which a lighting circuit including a ballast 4 is attached to a portion of the main body 1 covered by the reflector 3, the ballast 4 is installed on both sides of the ballast 4 on the fluorescent lamp 2 side. A heat dissipation hole 6 consisting of a long hole along the direction of the reflector 3 is bored, and the reflector 3 is attached to the hanging bracket 8 so that a heat dissipation gap 7 is formed between the upper end of the reflector 3 and the upper bottom surface 1a of the main body 1. It was hung up. Note that the distance a between the edge of the heat radiation hole 6 on the fluorescent lamp 2 side and the edge of the reflector plate 3, the shape of the heat radiation hole 6, and the width h of the heat radiation gap 7 are determined to prevent light from leaking and to provide an appropriate heat radiation effect. It is set to the optimum value that can be obtained. Furthermore, a reinforcing plate 9 is arranged at the mounting portion of the stabilizer 4 to reinforce mechanical accuracy.

The operation of the embodiment will be described below. now,
The air heated by the heat generated by the ballast 4 of the lighting circuit section, which is disposed in the part covered by the reflector 3 on the upper bottom surface 1a of the main body 1, spreads over approximately the entire length on both sides of the ballast 4. The heat is discharged as shown by the arrow X through the heat dissipation holes 6 formed over the area.
Since the heat dissipation of the ballast 4 is performed efficiently, there is no need to provide the heat radiating plate 14 on the ballast 4, and the cost is reduced. In addition, the heated air between the fluorescent lamp 2 and the reflector plate 3 is simultaneously discharged through the heat radiation hole 6 and the heat radiation gap 7 as shown by arrow Y, and the tube, which is the coldest point of the fluorescent lamp 2, is discharged at the same time. The increase in wall temperature is suppressed, and unlike the conventional example, a decrease in luminous flux due to an increase in tube wall temperature due to heat generation in the ballast 4 does not occur, and a decrease in equipment efficiency can be prevented. ing. In addition, the heat dissipation gap 7
Since there is no heat conduction to the reflector 3 through the upper bottom surface 1a of the main body 1, the reflector 3
As the temperature of the fluorescent lamp 2 becomes lower, the amount of radiant heat from the reflector 3 decreases, and the increase in the temperature of the tube wall of the fluorescent lamp 2 is reduced. Furthermore, the heat radiation hole 6
are formed on both sides of the ballast 4 over substantially the entire length of the ballast 4, so that heat conduction in the direction of the fluorescent lamp 2 via the upper bottom surface 1a of the main body 1 is prevented, and heat transfer via the lamp support spring 11 is prevented. It is possible to reduce the increase in tube wall temperature of the fluorescent lamp 2 due to heat conduction or heat radiation from the upper bottom surface 1a of the main body 1 above the fluorescent lamp 2, and decrease in appliance efficiency due to heat conduction from the ballast 4. can now be more effectively prevented.

[Effects of the invention] As mentioned above, the present invention has a plurality of straight tube fluorescent lamps arranged in a row in a box-shaped main body that opens downward, and the fluorescent lamps are arranged between each fluorescent lamp along the length of the lamp. In a lighting device, a V-shaped reflector is suspended from the top of the main body, and a lighting circuit including a ballast is attached to the part covered by the reflector on the top of the main body. A heat dissipation hole consisting of a long hole along the ballast is bored on both sides of the fluorescent lamp side of the ballast in the part covered by the plate, and between the upper end of the reflector plate and the top bottom surface of the main body. A reflector plate is suspended to form a heat dissipation gap, and the air heated by the heat generated by the ballast is discharged through the heat dissipation hole, allowing the ballast to dissipate heat efficiently. There is no need to provide a heat dissipation plate on the ballast, which has the effect of reducing costs. As a result, the heated air between the fluorescent lamp and the reflector is efficiently discharged, suppressing the increase in tube wall temperature (coldest point temperature) of the fluorescent lamp, preventing a decrease in luminous flux, and reducing equipment efficiency. It has the effect of preventing Furthermore, in order to effectively utilize the light from the fluorescent lamps, a V-shaped reflector plate is suspended with hanging metal fittings to form a heat dissipation gap and thermally separated from the main body. Since it is possible to reduce the heat conduction from the main body to the reflector near the reflector, it is possible to reduce the temperature rise of the reflector and suppress the rise in tube wall temperature of the fluorescent lamp, which is caused by the heat generated by the ballast. This has the effect of preventing a decrease in luminous flux due to an increase in tube wall temperature and preventing a decrease in instrument efficiency.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the same essential parts, and Fig. 3 is a sectional view of a conventional example.
Figure 4 is a cross-sectional view in the direction orthogonal to the cross-section in Figure 3, same as above;
FIG. 5 is an explanatory diagram of the same operation as above. 1 is the main body, 1a is the top and bottom surface, 2 is the fluorescent lamp, 3
4 is a reflector, 4 is a ballast, 6 is a heat radiation hole, 7 is a heat radiation gap, and 8 is a hanging fitting.

Claims (1)

[Scope of utility model registration request] A plurality of straight tube fluorescent lamps are arranged in a box-shaped main body that opens downward, and a V-shaped reflector is placed between each fluorescent lamp along the length of the fluorescent lamp on the top bottom of the main body. In a lighting fixture, the lighting circuit including the ballast is attached to the part covered by the reflector on the top bottom of the main body, and the ballast is attached to the part covered by the reflector of the main body. A heat dissipation hole consisting of a long hole along the ballast is drilled on both sides of the fluorescent lamp side of the reflector, and the reflector is installed so that a gap for heat dissipation is formed between the upper end of the reflector and the top bottom surface of the main body. A lighting fixture characterized by being hung with a hanging fitting.