JPH04359803A - Illumination fixture with louver - Google Patents

Abstract

PURPOSE:To accomplish a visual environment with comfortable illumination by lessening the brightness contrast of a framing plate constituting a lower to the photo-reflex surface of ceiling. CONSTITUTION:A framing plate 6 of a louver frame is formed from a photo- transmissive material, and the ceiling side upper part of this framing plate 6 is folded along the axis of an illumination fixture concerned so as to incline to the direction to the axis. Thereby a comfortable intra-room illumination visual environment is achieved without risk of generating a large brightness contrast between the ceiling reflex surface and the side face of the framing plate of louver.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture with a louver that can be used as a glare-cut type fixture to improve the indoor visual environment by attaching a louver frame to the main body of the ceiling-mounted exposed lighting fixture.

0002

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 3, a glare-cut type ceiling-mounted lighting fixture has a plurality of louver pieces 5 attached to a reflecting frame in a main body 2 of a ceiling-mounted exposed lighting fixture for fluorescent lamps. A lighting fixture with a louver was used in which a louver frame formed by connecting a plate 8 and a frame plate 6 was attached. The above-mentioned lighting equipment is extremely convenient for replacing existing lighting equipment with glare-cutting lighting equipment when installing office automation equipment in a room that was previously illuminated by ceiling-mounted exposed lighting equipment. The reflective frame plate 8 of the louver frame is provided to attach the louver frame to the fixture body 2, increase the light shielding angle from one fluorescent lamp 4 to the other side, and increase the glare cutting effect. Further, the frame plate 6 is formed using a light-impermeable material, and while it utilizes the light reflected by the ceiling surface 1 of the fluorescent lamp 4, it also prevents direct light from radiating to the side of the fluorescent lamp 4. This is provided to block the lights and prevent glare. Therefore, by simply attaching a louver frame as described above to a direct-ceiling exposed lighting fixture, it can be used as a direct-ceiling glare-cutting lighting fixture.

0003

[Problems to be Solved by the Invention] In the above-mentioned prior art, the frame plate of the louver frame needs a predetermined height in order to block the direct light beam directed to the side of the fluorescent lamp. Since it is made of non-transparent material, when viewed from the outside side, the frame board appears as a completely shadowed area, creating a large brightness contrast with the light-reflecting surface of the ceiling, giving a feeling of oppression. Therefore, the interior of the room illuminated by these lighting equipment could not be called a comfortable viewing environment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lighting fixture with a louver that can realize a comfortable viewing environment by reducing the brightness contrast between the frame plate forming the louver and the light reflecting surface of the ceiling.

[0005]

[Means for Solving the Problems] The above object is to provide a ceiling-mounted exposed lighting fixture body equipped with a lighting device such as a lamp socket and a ballast, with a plurality of louver pieces, a frame plate connecting the louver pieces, and a reflective frame plate. In a lighting fixture with a louver attached to a louver frame made of, at least the frame board is formed of a light-transmitting material, and the upper part of the frame board on the ceiling side is tilted along the axis of the lighting fixture in a direction with respect to the axis, This is achieved by bending the frame plate so that the reflected light from the ceiling surface is secondarily reflected on the inclined surface of the frame plate.

[0006]

[Function] The main body of the lighting fixture with louver according to the present invention is as follows:
Since it is an exposed type ceiling-mounted lighting fixture for two fluorescent lamps, the luminous flux emitted from the two fluorescent lamps irradiates downward and to the sides of the lighting fixture, and a portion of the light is emitted from the above lighting fixture. The ceiling surface is also irradiated as an upper hemisphere light beam. When the louver frame is attached to the main body of the device, the reflective frame plate constituting the louver frame is located between the two fluorescent lamps and has a shading angle in the direction opposite to each fluorescent lamp. By increasing the size, the glare that can be an obstacle can be cut. Each louver piece cuts glare in the axial direction of the luminaire. Furthermore, the frame plate, which is placed almost vertically opposite to each other with the two fluorescent lamps in between, and forms the louver frame together with the reflective frame plate and the louver pieces, blocks the luminous flux emitted laterally from the fluorescent lamp. However, the upper part of the frame plate on the ceiling side is tilted along the axis of the lighting fixture in a direction relative to the axis. Therefore, a portion of the light that is directed obliquely upward from the fluorescent lamp and reflected on the ceiling surface near the lighting fixture is secondarily reflected on the inclined surface of the frame plate. Further, when the frame plate is formed of a light-transmitting material, part of the light emitted laterally from the fluorescent lamp can be emitted outward in accordance with the transmittance of the frame plate. Therefore, if the brightness of the surface of the vertical part of the frame board is A, the brightness of the surface of the sloped part of the frame board is B, and the brightness of the ceiling surface near the lighting fixture is C, the brightness contrast on each surface is A≦B<
C. In this way, C, which is the brightness of the ceiling reflective surface of direct light, is the brightest, and B, which is the brightness of the secondary reflective surface of the reflected light, is located adjacent to it.
Furthermore, if the frame board is arranged so that the brightness A of the light transmitting surface continues, a strong brightness contrast will not occur in the vicinity of the glare-cut type lighting fixture, and a comfortable viewing environment can be created.

[0007] Note that the frame plate may be tilted directly from the lower edge in a direction relative to the axis of the lighting fixture, so that the light reflected from the ceiling surface is secondarily reflected on the entire surface of the frame board, but the configuration of the lighting fixture This is not desirable because the upper outer shape becomes larger.

[0008]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view showing an embodiment of a lighting fixture with a louver according to the present invention, and FIG. 2 is an explanatory diagram showing a cross section of the above embodiment. As shown in FIG. 1, the louvered lighting fixture according to the present invention connects a plurality of louver pieces 5 to a fixture main body 2 of a ceiling-mounted exposed lighting fixture equipped with a lighting device such as a lamp socket or a ballast. A louvered lighting fixture is constructed by attaching a louver frame consisting of a frame plate 6 and a reflective frame plate 8. The fixture main body 2 shown in FIG. 1 is a so-called reverse Fuji type or Fuji type exposed two-lamp fluorescent lamp fixture that is directly attached to the ceiling, and has a cross section as shown in the cross-sectional explanatory diagram of FIG. Fluorescent lamps 4 are held by lamp sockets 3 corresponding to respective reflective surfaces forming hypotenuses of a flat isosceles triangle. Therefore, the light emitted from the fluorescent lamp 4 is emitted not only below and to the sides of the instrument body 2, but also obliquely upward as an upper hemispherical light beam, and illuminates the ceiling surface near the instrument body 2. The louver-equipped lighting fixture of this embodiment has a plurality of louver pieces 5 arranged around a reflective frame plate 8 at the center.
A louver frame is formed by assembling a lattice of frame plates 6, and the louver frame is attached to the instrument main body 2 via a reflective frame plate 8. The reflective frame plate 8 is interposed between the two fluorescent lamps 4, and prevents glare in the same direction by increasing the shielding angle in the direction opposite to each fluorescent lamp 4. Further, the heights and mounting intervals of the plurality of louver pieces 5 arranged perpendicularly and parallel to the axis of the luminaire main body 2 are determined so as to cut glare in the axial direction of the lighting apparatus. The two frame plates 6 are arranged substantially perpendicularly to each other with the two fluorescent lamps 4 in between, and the upper portions of the frame plates 6 on the ceiling side are respectively bent and tilted in the direction of the axis along the axis of the lighting fixture. The frame plate 6 is provided to support the louver piece 5 and to cut glare by blocking the luminous flux emitted to the side of the fluorescent lamp 4. In the present invention, the upper part of the frame plate 6 on the ceiling side is bent in the direction relative to the axis of the lighting fixture, so that the reflected light of the light that illuminates the ceiling surface near the fixture body 2 as an upper hemisphere light beam is secondarily reflected on the bent surface and illuminates the inclined surface. do. For this reason, the brightness contrast between the frame board and the ceiling surface, which conventionally showed a strong brightness contrast with the ceiling surface, is greatly relaxed due to the brightness obtained by the ceiling reflected light in the upper half of the frame board. Furthermore, in the present invention, since the frame plate is made of a light-transmitting material, the fluorescent lamp 4, which was conventionally shielded from light,
A part of the light emitted to the side passes through the frame plate 6 and is emitted as shown by b or c in FIG. 2, producing brightness on the surface. This surface brightness changes depending on the light transmittance of the frame board material, but the brightness of the vertical part surface of the frame board 6 is A, the brightness of the slope part surface of the frame board 6 is B, and the brightness of the surface of the inclined part of the frame board 6 is B. When the brightness of the nearby ceiling surface is C, it is possible to configure the brightness of each surface to satisfy A≦B<C. Since the louvered lighting fixture according to the present invention is a glare-cut type lighting fixture as described above, there is no direct illumination area with high brightness except for the lower area of the lighting fixture, and the lighting fixture is illuminated by direct light emitted from the fluorescent lamp 4. Of course, the ceiling surface brightness C near the main unit is high,
If the brightness B of the surface of the sloped part of the frame plate adjacent to this is arranged so that the transmitted brightness A of the surface of the vertical part of the frame plate is in contact with this, there will be no strong brightness contrast at all, including the case where B=A. Therefore, it is possible to create a comfortable illumination viewing environment without experiencing glare.

Although the present embodiment has been described with respect to a two-light fluorescent lamp lighting fixture, the same effect can be obtained regardless of the number of fluorescent lamps.

0010

Effects of the Invention As described above, the louver-equipped lighting fixture according to the present invention includes a ceiling-mounted exposed lighting fixture body equipped with a lighting device such as a lamp socket and a ballast, and a plurality of louver pieces and a frame connecting them. In a lighting fixture with a louver equipped with a louver frame made of a board and a reflective frame board, at least the frame board is formed of a light-transmitting material, and the upper part of the frame board on the ceiling side is aligned along the axis of the lighting fixture. By bending the frame board so that the reflected light from the ceiling surface undergoes secondary reflection on the sloped surface of the frame board, the brightness of the ceiling reflective surface and the brightness of the side surface of the frame board of the louver, more specifically, the slope of the frame board. It is possible to obtain a lighting fixture with a louver that does not cause a large brightness contrast between the brightness of the vertical part surface and the brightness of the vertical part surface of the frame board, cuts the glare of the lighting fixture, and creates a comfortable indoor lighting viewing environment. .

[Brief explanation of drawings]

FIG. 1 is an external view showing an embodiment of a louvered lighting fixture according to the present invention.

FIG. 2 is an explanatory diagram showing a cross section of the above embodiment.

FIG. 3 is an explanatory diagram showing a cross section of a conventional louvered lighting fixture.

[Explanation of symbols]

2　　　Lighting equipment body 3 Lamp socket 5 Louva piece 6 Frame board 8 Reflective frame board

Claims (1)

[Claims] Claim 1: A louver in which a louver frame consisting of a plurality of louver pieces, a frame plate connecting the louver pieces, and a reflective frame plate is attached to a ceiling-mounted exposed lighting fixture body equipped with a lighting device such as a lamp socket or a ballast. In the lighting fixture, at least the frame board is formed of a light-transmitting material, and the upper part of the frame board on the ceiling side is tilted along the axis of the lighting fixture in a direction relative to the axis, so that the reflected light from the ceiling surface is A lighting fixture with a louver characterized by being bent so as to cause secondary reflection on the inclined surface of the frame plate.