JPH0548322Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a lighting fixture using a fluorescent lamp.

[Background Art] This type of lighting equipment is embedded in the ceiling surface, etc., and the opening surface has a
A louver 3 is used to avoid direct viewing from diagonally below, and a U-shaped fluorescent lamp 4 is installed inside. This U-shaped fluorescent lamp 4, as shown in FIG. The tip side of the tip 5 is a coldest point protrusion 6, and the vapor pressure of the sealed gas is determined by the coldest point temperature. Figure 5 shows the relationship between the coldest spot temperature and the lamp luminous flux.If the coldest spot temperature is higher than the maximum temperature, the luminous flux decreases, so the temperature of the coldest spot protrusion does not rise much even when the lamp is on. Therefore, it is desirable to have a structure that prevents this from occurring.

[Purpose of the invention] The present invention was devised in view of these points, and its purpose is to provide a structure for this type of lighting equipment that can prevent the temperature at the coldest point from increasing as much as possible. It is in.

[Disclosure of the invention] However, in the lighting equipment according to the invention, a fluorescent lamp having a coldest point protrusion is installed in the equipment main body having an open bottom surface, and a louver is provided on the opening surface. One piece of the louver is positioned directly below the coldest point protrusion, and when convection occurs due to the rise in temperature of the fluorescent lamp, an upward air current is generated along the vertical piece of the louver. The coldest point protrusion of the fluorescent lamp is cooled by this rising air current.

Embodiment FIG. 1 shows an embodiment of the present invention, in which a fixture main body 2 is buried in a ceiling surface 1, and a louver 3 is provided in the lower opening of the fixture main body 2.
The fluorescent lamp 4 is the same as the one shown in FIG. 4b, and has a communicating portion 5 near the tips of two parallel straight tubes, and a portion further toward the tip of the communicating portion 5 is a coldest point projection. 6. A cap 7 is attached to the base ends of the two straight tubes, and a plug 8 protruding from the cap 7 is fitted into a socket 9, and the tip of the lamp is fitted into a hanging fitting 10. A fluorescent lamp 4 is mounted within the instrument body 2. As shown in FIG. 2, the louver 3 is formed by combining a plurality of vertical pieces 11, and is intended to prevent the fluorescent lamp 4 from being viewed directly at a relatively small elevation angle in a large room. In the present invention, one of the vertical pieces 11 of the louver 3 is disposed directly below the coldest point protrusion 6. Normal fluorescent lamp 4
When the lamp is turned on, an upward air current is generated along the vertical piece 11 of the louver 3, as shown by the arrow in the same figure, and this is because the vertical piece 11 is heated by the radiant heat from the fluorescent lamp 4, causing it to rise above the surrounding air. This is thought to be due to the relatively high temperature of the cold spot, but this upward laminar flow promotes heat dissipation from the coldest spot protrusion 6 and prevents the coldest spot temperature from rising. Depending on the shape of the louver 3, the intersection of the orthogonal vertical pieces 11 may be located directly below the coldest point protrusion 6, as shown in the embodiment of FIG. With this configuration, the strongest upward airflow is generated at the intersection, so a further cooling effect can be expected.

[Effects of the invention] As described above, the present invention is a lighting equipment in which a fluorescent lamp having a coldest point protrusion is installed in the equipment main body with an open bottom surface, and a louver is provided on the opening surface. Since one sheet is positioned directly below the coldest point protrusion, the coldest point of the fluorescent lamp 4 can be cooled by the airflow rising along the vertical piece, increasing luminous efficiency. If it is a device, the coldest point can be cooled using the original configuration, so there is no increase in cost or deterioration of appearance as would be the case if a separate cooling device is installed, and a simple and clean appearance can be achieved. This has the effect of keeping it as it is.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a perspective view of the main parts of the same, Fig. 3 is a perspective view of the main parts of another embodiment of the same, and Fig. 4a is a conventional FIG. 5 is a longitudinal sectional view of the example, FIG. 5 is a perspective view of the main part of the same, and FIG. 1 is the ceiling surface, 2 is the appliance body, 3 is the louver, 4 is the fluorescent lamp, 5 is the communication part, 6 is the coldest point projection, 7 is the base, 8 is the plug, 9 is the socket, 10 is the hanging fitting, 11 is Vertical piece.

Claims (1)

[Scope of utility model registration request] In a lighting equipment in which a fluorescent lamp having a coldest point protrusion is installed in the equipment body with an opening at the bottom and a louver is provided on the opening, one of the vertical pieces of the louver
A lighting fixture comprising a sheet located directly below the coldest point projection.