JPH0320844B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a lighting device, and the present invention relates to a lighting device, which controls light emitted from a rectangular lower opening of a device body and achieves illumination intensity with a rectangular irradiation pattern shape. The present invention relates to a translucent cover that forms a distribution.

(Prior Art) Conventionally, this type of lighting equipment has either a plurality of prisms formed in a substantially square opening on the lower surface of the equipment body, or a translucent cover formed in a matte finish. This light projecting cover has a structure in which the light emitted from the opening of the main body is controlled so as to spread not only directly below but also to the surrounding area.

(Problem to be Solved by the Invention) However, in the lighting fixture with the above-mentioned conventional structure, the light distribution characteristic is approximately an elliptical shape elongated in the vertical direction, and the direction directly below the main body is the brightest, and the farther from the position directly below, the darker it becomes. Therefore, the irradiation range was narrow, and it was not possible to uniformly illuminate a square shape, resulting in the problem that many devices were required to uniformly illuminate a wide area.

As described in Japanese Patent Application Laid-Open No. 59-56301, a substantially square translucent cover has a prism surface formed of a plurality of concentric prism portions in the center of the plate surface. , a prism surface consisting of a plurality of prisms divided into four sections and parallel to the outer periphery is formed between each side of the central prism surface and the outer periphery of the plate surface; A structure has been proposed (not publicly known) in which a prism surface is formed between the prism surface and the corner portion, and is composed of a plurality of prism portions that are divided into four sections and extend in a direction intersecting the diagonal line of the plate surface.

However, in a cover with this structure, a prism surface consisting of concentric prism parts is formed in the center of the plate surface, so the light incident on the center illuminates directly below and around it, so it is directed diagonally. There is a problem that the light is reduced, and the prism surface in the center does not contribute to angular illumination distribution.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a lighting fixture that can significantly improve the luminous intensity in the diagonal direction of the opening of the fixture body and provide angular illumination distribution with a well-uniform illuminance distribution. be.

[Structure of the invention]

(Means for Solving the Problems) The lighting fixture of the present invention includes a light source, a fixture body that emits light from the light source through a lower opening, and a rectangular shape disposed in the lower opening of the fixture body. and a translucent cover, the cover having a substantially X-shaped strip formed across the corner by a plurality of prism sections along the direction intersecting the two diagonal lines of the plate surface. It has a first prism surface and a second prism surface divided into four parts formed by a plurality of prism parts formed in each triangular part between the first prism faces and parallel to the side part between the diagonals. It is.

(Function) In the lighting fixture of the present invention, the light emitted in two diagonal directions of the light-transmitting cover provided at the lower opening of the fixture main body is spread by the belt-shaped first prism surface forming a substantially X-shape. At the same time, the emitted light between the diagonals is apertured on the second prism surface to obtain a rectangular illuminance distribution with good uniformity.

(Embodiment) Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

As shown in FIGS. 1 and 2, the instrument body 1
0 is formed into a rectangular tube shape, and a rectangular, for example square, opening 11 is formed on the bottom surface. Also,
This main body 10 is embedded and fixed in a hole in the ceiling surface. Opening 1 of this main body 10
1 is provided with a decorative frame 12, which is connected to the main body 10 by a well-known substantially V-shaped spring 13.
It is removably attached to. A translucent cover 14 is attached to this decorative frame 12.

Further, a lamp mounting hole 15 is formed in the center of the upper surface of the main body 10, and a mounting frame 16 is fixed to the upper surface of the main body 10, spanning the lamp mounting hole 15. The lamp socket 17 provided in this mounting frame 16 is connected to the lamp mounting hole 15.
is faced with.

18 is a light source, for example, a high-intensity discharge lamp, and this lamp 18 is connected to the base portion 1 from the inside of the main body 10.
9 protrudes from the lamp mounting hole 15 and is attached to the lamp socket 17. This lamp 18 is designed to be included in the main body 10.

Next, the light-transmitting cover 14 is formed of a light-transmitting plate material such as glass or synthetic resin into a rectangular shape, for example, a square shape, and has a smooth upper surface as shown in FIGS. 3 to 7. A sawtooth-shaped first prism surface 21 has a plurality of prism portions 20 that intersect at right angles to the two diagonal directions (A-A) of the plate surface on the lower surface.
is formed into a substantially X-shape. The first prism surface 21 is designed to widen the peak direction of the light in the diagonal direction (A-A) emitted from the opening 11 of the main body 10 and to greatly control the luminous intensity value.

Further, on the lower surface of the light-transmitting cover 14, second prism surfaces 22 are formed in triangular sections divided into four parts between the first prism surfaces 21. This second prism surface 22 has a plurality of prism parts 24 that intersect at right angles to the direction axes (B-B, C-C) toward the center of the sides 23 between the diagonals, that is, the sides 23 between the diagonals. The second prism surface 22 has a sawtooth cross section, and the second prism surface 22 is parallel to the diagonal direction (A
- Compared to A), control is performed to narrow the peak direction of the light emitted from the aperture 11 and to lower the luminous intensity value.

Next, the operation of this embodiment will be explained.

The light emitted from the lamp 18 passes through the transparent cover 1
The light in the diagonal direction of the irradiation pattern is controlled by the first prism surface 21 having a substantially X shape, and the peak direction of the controlled light 25 expands as shown in the light distribution characteristics of FIG. 8, and the luminous intensity increases. The value increases. Also, a second prism surface 22 between this first prism surface 21
The lights 26 and 27 controlled by the light beams 26 and 27 have a narrower peak direction and a lower luminous intensity value than the light emitted in the diagonal direction, and the illumination intensity of the square irradiation pattern due to the light emitted through the transparent cover 14 is reduced. The uniformity of the distribution is improved.

〔Effect of the invention〕

According to the present invention, the rectangular light-transmitting cover disposed at the lower opening of the device body that emits light from the light source from the lower opening extends along the direction in which two diagonal lines of the plate surface intersect. A strip-like first prism surface having a substantially X-shape is formed across the corners of a plurality of prism portions, and a strip-shaped first prism surface is formed in each triangular portion between the first prism surfaces and is formed between the diagonal lines. The second part is formed by multiple prism parts parallel to the sides and divided into four parts.
Since the prism surface has a prism surface of , the peak direction of the emitted light between the diagonals is narrowed, there is no overlap of light, there is no drop in the illuminance distribution, the uniformity of the illuminance distribution of the angular illumination pattern is good, a rectangular illuminance distribution can be easily obtained, and the illuminance distribution of the fixture is Since the number of installations can be greatly expanded, the number of fixtures required to obtain the same uniform illuminance on the floor can be reduced compared to conventional fixtures.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a lighting fixture showing one embodiment of the present invention, Fig. 2 is a partially cutaway front view of the same as above, Fig. 3 is a front view of a translucent cover as above, and Fig. 4 is as above. A side view, FIG. 5 is a bottom view of the same as above, FIG. 6 is a cross-sectional view of the line in FIG. 3, FIG. 7 is a cross-sectional view of the line in FIG. . 10... Instrument body, 11... Opening, 14...
Translucent cover, 20, 24... Prism section, 21
...first prism surface, 22...second prism surface.

Claims (1)

[Scope of Claims] 1. A device comprising a light source, a device main body that emits light from the light source through a lower opening, and a rectangular translucent cover disposed in the lower opening of the device main body, The cover includes a strip-shaped first prism surface having a substantially X shape formed across a corner by a plurality of prism sections along a direction intersecting two diagonal lines of the plate surface; A lighting device characterized by having a second prism surface divided into four parts formed by a plurality of prism parts formed in each triangular part between the prism faces and parallel to the side part between the diagonals.