JPH0145043Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a lighting fixture, and more specifically, to a lighting fixture that increases the uniformity of illuminance on a work surface.

[Background Art] In conventional lighting equipment of this type, lamps having linear light emitting parts are arranged on the same plane so as to be substantially parallel to each other in order to obtain uniformity of illuminance on the work surface. The one I set up was hot. For example, when using two U-shaped fluorescent lamps 1, as shown in FIG. There was a structure in which both U-shaped fluorescent lamps 1 were housed in a main body box 2 that opened downward, but according to this structure, both U-shaped fluorescent lamps 1 were housed on the work surface.
At a position corresponding to the center, the luminous flux is concentrated and the illuminance is higher than that at the peripheral area, and there is a problem that the uniformity of the illuminance is low.

[Purpose of the invention] The present invention has been made in view of the above points, and its main purpose is to provide a lighting fixture that increases the uniformity of illuminance on a work surface.

[Disclosure of the invention] Examples Examples of the invention will be described below based on the drawings. In this embodiment, an example is shown in which a U-shaped fluorescent lamp is used as the lamp 1 serving as a light source, but it goes without saying that the same concept can be applied to a straight tube type lamp or the like.

As shown in FIGS. 1 and 2, a pair of U-shaped fluorescent lamps 1 are disposed in a main body box 2 that is partially opened downward, and the opening surface of the main body box 2 is diffused. Covered by plate 3. Inside the main body box 2, above the diffuser plate 3 and below the U-shaped fluorescent lamp 1, a glass plate 4 whose both sides have been sandblasted is arranged parallel to the diffuser plate 3. The light diffusion effect is enhanced. Both U-shaped fluorescent lamps 1 are arranged so that their linear parts are parallel to each other, and are tilted in the center of the main body box 2 so as to be farther away from the glass plate 4 than both ends of the main body box 2, and this inclination angle θ is the tube diameter of U-type fluorescent lamp 1.
When the length is about 20 mm, and the length is about 150 mm, the inclination is about 10 degrees with respect to the glass plate 4 (ie, the work surface). That is, each U-shaped lamp 1 connects the straight line part near the center of the main body box 2 to the main body box 2.
It is placed at a higher position than the straight part near the end of the line. A socket 5 connected to the U-shaped fluorescent lamp 1 is disposed inside the main body box 2, and a storage section 6 is provided below the socket 5 for storing a lighting circuit and the like. A heat dissipation slit 7 is formed in the lower wall of the storage section 6. Further, as shown in FIG. 3, a heat dissipation slit 8 is also formed in the upper wall of the main body box 2.

As mentioned above, since the U-shaped fluorescent lamp 1 is arranged in the center of the main body box 2 away from the work surface, as shown in FIG. The difference between the central part and the peripheral part becomes smaller, and the uniformity of illuminance on the work surface becomes larger. In this way, the uniformity of illuminance on the work surface increases, so for example, in desk lighting, etc.
It has the advantage of being optimal as a lighting fixture that requires high uniformity of illuminance on a work surface. Also, U
The use of the type fluorescent lamp 1 has the advantage of being compact and providing high brightness.

[Effects of the invention] As described above, the present invention has a linearly formed first
and a second light emitting part formed in a linear shape and disposed on both sides of the first light emitting part so as to be substantially parallel to the first light emitting part. Since the second light emitting part is located farther from the work surface than the second light emitting part, the luminous flux is not concentrated in the center of the lighting equipment, and there is no decrease in illuminance at the periphery. As a result, it has the advantage of increasing the uniformity of illuminance on the work surface.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a plan view of the same,
FIG. 4 is an explanatory diagram of the same operation as above, and FIG. 5 is an explanatory diagram of the operation showing a conventional example. 1 is the lamp, 2 is the main box.

Claims (1)

[Scope of utility model registration request] It has a first light emitting part formed in a linear shape and a second light emitting part formed in a linear shape and disposed on both sides of the first light emitting part so as to be substantially parallel to the first light emitting part. death,
A lighting fixture in which a first light emitting section is disposed at a position farther from a work surface than a second light emitting section in a light projection direction.