JPH0750563B2 - lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a luminaire provided with a louver, in which the ceiling surface is brightened so as not to feel gloomy.

(Prior Art) An illumination device used by being embedded in a ceiling surface is, for example, as described in Japanese Utility Model Laid-Open No. 62-73407, an angle at which the light emitted from a lamp cannot be seen directly from below (hereinafter referred to as light-shielding). Called a horn) is usually determined. This shading angle can be determined by the arrangement position of the lamp in the luminaire or the design of the louver or the like.

For example, the lighting equipment that is used by being embedded in the ceiling of an office has a light blocking angle of approximately 30 ° so that it will not be reflected in the picture tube of OA equipment (office automation equipment). Has been developed and put into practical use. In the luminaire constructed in this way, the lamp is arranged at the back of the main body of the luminaire, and the light-shielding angle of the lamp is set to about 30 ° by using a louver.

However, since the lamp is installed in the main body of the lighting equipment embedded in the ceiling surface, the ceiling surface is not directly illuminated by the light emitted from the lamp, and the ceiling surface is dark and feels dismal. There are inconveniences such as causing it.

Therefore, a structure of a louver in which a lower end portion of a light diffusing white louver provided in such a lighting device is projected downward from an opening edge of a lower end of the lighting device is being studied. According to the luminaire using this louver, the light emitted from the lamp is diffused and reflected by a part of the surface of the louver protruding from the lower end opening edge of the main body of the fixture, and among the diffused light, the light reflected above the horizontal. Can brighten the ceiling surface and the light reflected downward can increase the vertical illuminance.

Further, Japanese Utility Model Laid-Open No. 51-146887 describes a lighting fixture in which the lower end edge of the end region of a lattice louver having the lower end portion protruding downward from the lower end opening edge of the lighting fixture is inclined.

(Problems to be solved by the invention) By the way, since the brightness near the light emitting end of the fluorescent lamp is lower than that of the middle portion and the emitted light is relatively small, the light emitting end of the fluorescent lamp faces the vicinity of the light emitting end of the fluorescent lamp compared to the middle region of the louver. The amount of light incident on the edge region of the louver is small. Therefore, as described above, when the lower end portion of the louver is simply projected downward from the lower end opening edge of the luminaire, the diffuse reflected light amount from the lower end portion of the end area is smaller than that in the intermediate area at the lower end portion of the louver. And a substantial dark part is formed in the end area,
The luminance in the longitudinal direction of the lower end of the louver becomes non-uniform. Then, to the person in the room, the uneven brightness at the lower end of the louver can be seen in the desired state on the ceiling surface, which not only spoils the appearance of the ceiling surface but also gives an unpleasant lighting environment. become.

Further, since the louver extends along the entire length in the longitudinal direction of the lamp, the protrusion of the end region of the louver is conspicuous, which is not only not preferable in appearance as a lighting fixture, but also the lighting fixture is embedded and arranged. The protrusion of the louver is emphasized on the ceiling surface, which causes a feeling of strangeness on the ceiling surface. In particular, on the ceiling surface where a large number of lighting fixtures are embedded, a large number of people inside the room are pressed by the louvers that are emphasized and projected from the ceiling surface, giving an unpleasant visual environment. in addition,
When this luminaire is lit, the lower end of the end area of the louver has a relatively high brightness compared to the ceiling surface,
With the ceiling surface as the background, the protrusion of the lower end of the end region becomes more prominent.

Furthermore, when the lower end of the end region of the louver projects downward from the lower end opening edge, the emitted light from the lamp or the diffuse reflection light from another louver irradiates the lower end of this end region. The shadow of the lower end of the end region is projected on the ceiling surface side in the lamp longitudinal direction.

On the other hand, the luminaire described in Japanese Utility Model Publication No. 51-146887 does not extend along the entire length of the fluorescent lamp in the longitudinal direction, so that the protrusion of the louver in the longitudinal direction is not emphasized. Since the louver piece parallel to the reflection plate is in contact with the reflection plate as the upper edge of the lattice louver, the light from the lamp is blocked in the end region. Therefore, at the lower end of the end area of the louver, a dark portion which is significantly lower than the lower end of the intermediate area is formed, uneven brightness occurs in the entire louver, and not only does it impair the appearance of the ceiling surface, This will give an unpleasant lighting environment.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an embedded lighting fixture that can provide a comfortable lighting environment and improve the appearance of the lighting fixture.

[Structure of the Invention] (Means for Solving the Problem) An illuminating device of the present invention is an embedded type, and an embedded type illuminating device main body having a flange portion that abuts a ceiling surface at a lower end opening edge,
A straight tube fluorescent lamp arranged in the lighting fixture body, a ballast equipped in the lighting fixture body, an intermediate region facing the intermediate portion of the fluorescent lamp, and a fluorescent lamp provided at both ends in the longitudinal direction of the intermediate region. The end region of the lighting device is located in the vicinity of the light emitting end of the lighting device and extends along the longitudinal direction of the fluorescent lamp into the main body of the luminaire. At the lower end of the fluorescent lamp, both ends in the tube end direction of the fluorescent lamp are protruded and are approximately the same height as the lower end opening edge of the luminaire main body, and are inclined from both ends to the lower end edge of the intermediate area. A first light-diffusing louver piece arranged so that light from
The first louver piece intersects with the middle portion of the first louver piece so as to be substantially orthogonal to the longitudinal direction of the fluorescent lamp, is disposed below the fluorescent lamp, and is disposed in the main body of the luminaire, and the lower end thereof is the lower end of the main body of the luminaire. A plurality of light diffusive second louver pieces protruding downward from the opening edge are provided.

In the lighting device of the present invention, the first louver piece may also serve as a cover for covering a desired component such as a ballast provided in the device body with the pair of inclined surface portions.

(Operation) In the lighting equipment of the present invention, when the straight tube fluorescent lamp is turned on, the light emitted from the lamp is directly or incident on the equipment main body and the first louver piece, and diffused and reflected from the lower end opening of the lighting equipment main body. Irradiate the surface to be illuminated.

Then, the light from the straight tube fluorescent lamp is incident on the lower end portion of the first louver piece protruding from the lower end opening edge of the lighting fixture body and the lower end portion of the second louver piece near the tube end portion of the fluorescent lamp, It is diffusely reflected. The lower end edge of the end region of the first louver piece facing the vicinity of the light emitting end of the fluorescent lamp with low brightness and relatively small emitted light is inclined from both ends to the lower end edge of the intermediate region, and is incident from the fluorescent lamp. Diffuse the reflected light. Then, at the lower end of the end region of the first louver piece, the distance between the fluorescent lamp and the lower edge becomes smaller as the emitted light of the fluorescent lamp decreases, so that the lower end of the end region is substantially The dark portion is not formed, and the luminance distribution becomes lower toward the tube end portion of the fluorescent lamp, and the luminance unevenness at the lower end portion of the louver piece becomes inconspicuous. Further, since the protrusion of the lower end portion of the end region of the first louver piece is not conspicuous and the protrusion of the first louver piece is not emphasized, the appearance of the lighting fixture when embedded in the ceiling surface is improved.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Reference numeral 1 denotes a luminaire main body, which is formed in an elongated box shape having a lower end opening 2 on a lower surface, and is bent so as to extend from the edge of the lower end opening 2 to the outer side in the surface direction of the lower end opening 2. A bent edge 3 is provided as a formed collar portion. The lighting fixture body 1 is embedded in the ceiling surface 4 so that the bent edge 3 contacts the ceiling surface 4. Numerals 5 and 5 are two straight tube fluorescent lamps, which are arranged in parallel in the lighting fixture body 1.

6 is a louver, and this louver 6 has a first louver piece 9 and a second louver piece 2.
The louver piece 10 is included. The first louver piece 9 is formed to include a pair of inclined surface portions 8 and 8 which are expanded upward.

The first louver piece 9 is composed of an intermediate region facing the intermediate portion of the fluorescent lamp 5 and end regions provided at both ends of the intermediate region in the longitudinal direction and facing the light emitting end of the fluorescent lamp 5, and the fluorescent lamp is provided with the intermediate region. 5 along the longitudinal direction of the lighting fixture body 1
Has been extended within. A plurality of the second louver pieces 10 are provided in the intermediate region of the first louver piece 9 so as to intersect with each other and to be separated from each other so as to be substantially orthogonal to the longitudinal direction of the fluorescent lamp 5.

The louver 6 positions the first louver piece 9 between the two fluorescent lamps 5 and 5 along the longitudinal direction along the entire length thereof, and at the same time, the first louver piece 9 and the second louver piece 10 are arranged. Is provided so as to project downward from the edge of the lower end opening 2 of the luminaire main body 1.

The lower end of the middle region of the first louver piece 9 is the lighting fixture body 1
Of the lower end opening of the lower end of the lower end of the lower end of the lower end of the lower end of the lower end of the upper end of the lower end of the lower end of the lower end of the lower end of the lower end of the lower end of the upper end of the lower end of the upper end of the lower end of the upper end of the lower end of the lower end of the upper end of the upper end of the upper end of the lower end open. At the lower end of the end region of the first louver piece 9, both ends in the tube end direction of the fluorescent lamp 5 are substantially at the same height as the lower end opening 2 edge of the luminaire main body 1, and the lower end edge is first from both ends. The louver piece 9 is formed by taper cutting so as to incline downward to the lower end edge of the intermediate region of the louver piece 9, the lower end portion of the louver piece 9 projects downward from the lower end opening 2 edge, and the light from the fluorescent lamp 5 is incident. Is installed in. Further, the second louver piece 10 is also formed by cutting at least a portion projecting from the lower end opening 2 edge of the lighting fixture body 1 so as to be inclined downward from the lower end opening 2 edge of the lighting fixture body 1.

Both the first and second louver pieces 9 and 10 of the louver 6 are formed of, for example, iron plates, and the inner and outer surfaces of the louver 6 are coated with white to form a light diffusing reflection surface for obtaining an upper light flux. The luminaire main body 1 is also made of, for example, an iron plate, and its inner and outer surfaces are painted white.

Then, the angle α formed by the straight line contacting the lower end of the tube diameter of the fluorescent lamp 5 from the edge of the lower end opening 2 of the luminaire main body 1 and the surface of the lower end opening 2 of the luminaire main body 1 is approximately 30 °, and the adjacent second louver Piece
The light blocking angle of the lamp is formed by setting an angle β formed by a straight line between one upper end and one lower end of one of the lines 10 and a straight line between the lower end parts to about 30 °.

Reference numerals 11 and 11 denote sockets provided in the luminaire main body 1, and 12 denotes a ballast provided at the center of the top of the luminaire main body 1. The pair of inclined surface portions 8 of the first louver piece 9 may also serve as a cover for covering the ballast 12.

Next, the operation of this embodiment will be described.

When the fluorescent lamps 5 and 5 are turned on, the light emitted from the fluorescent lamps 5 is directly or mainly reflected by the luminaire main body 1 and the inclined surface portions 8 and 8 of the first louver piece 9 and is then luminaire main body 1
Is radiated from the lower end opening 2 of the. Since the light-shielding angle of the lamp is about 30 °, direct light emitted at a vertical angle of about 60 ° or more is cut, glare is reduced, and reflection on the picture tube can be prevented.

Then, the light from the fluorescent lamp 5 has an intermediate region of the first louver piece 9 protruding downward from the edge of the lower end opening 2 of the luminaire main body 1 in the end region and the tube end side of the fluorescent lamp 5. The light is incident on and reflected at the lower end of each of the provided second louver pieces 10. At this time, as shown in FIG.
Since the surface of each of the louver piece 9 and the second louver piece 10 is formed of a white painted surface, the light incident on the lower end of each of the first louver piece 9 and the second louver piece 10 is diffused. Is reflected. Of the diffused light, the light A emitted above the horizontal brightens the ceiling surface 4, and the light B emitted downward increases the vertical illuminance. Therefore, even if the fluorescent lamp 5 is arranged at the back of the luminaire main body 1 so that the light-shielding angle of the lamp is set to about 30 °, the ceiling surface 4 becomes bright and the darkness is alleviated. Further, the vertical illuminance is also increased, and as a result, the sense of brightness of the entire room is increased and the visual environment is improved.

Further, the end regions of the first louver piece 9 are located at both ends of the first louver piece 9 from the middle part of the fluorescent lamp 5 which emits a relatively large amount of emitted light toward the light emitting end of the fluorescent lamp 5 which emits a relatively small amount of emitted light. Is inclined so as to be almost at the same height as the lower end opening 2 edge of the luminaire main body 1, so that as the emitted light of the fluorescent lamp 5 decreases, the distance between the fluorescent lamp 5 and the lower edge decreases and the end portion Substantially no dark part is formed in the area. Therefore, the lower end portion of the end region of the first louver piece 9 has a lower luminance distribution toward the tube end portion of the fluorescent lamp. The aesthetic appearance as a fixture is excellent, and the aesthetic appearance of the ceiling surface in which this lighting fixture is buried is not impaired, and a comfortable lighting environment can be given to a person in the room.

Further, at the lower end of the end region of the first louver piece 9, both ends in the tube end direction of the fluorescent lamp 5 are substantially the same height as the lower end opening 2 edge of the lighting fixture body 1, and the lower end edges are both ends. To the lower end edge of the intermediate region, the first louver piece 9 is not conspicuous even if both end portions of the first louver piece 9 project from the lower end opening 2 edge, and not only the appearance is improved but also this lighting fixture is embedded. It is possible to provide a comfortable visual environment without causing a feeling of strangeness in the exposed ceiling surface 4.

Further, since the lower end of the end region of the first louver piece 9 is inclined downward from both ends to the lower end of the intermediate region and protrudes downward from the two lower end openings, the fluorescent lamp 5 From the lower end of the second louver piece 10 provided on the tube end side of the fluorescent lamp 5 or the diffused reflected light from the lower end of the second louver piece 10 irradiates the lower end of this end region. The shadow of the lower end does not substantially appear on the ceiling surface 4 side of the fluorescent lamp 5 in the longitudinal direction.

Further, both ends in the tube end direction of the fluorescent lamp 5 in the end region of the first louver piece 9 and the lower end opening 2 edge of the lighting fixture body 1 have substantially the same height in the arranged state of the first louver piece 9. Therefore, when the first louver piece 9 is attached to the lighting fixture body 1 embedded in the ceiling surface 4 from the lower end opening 2, the end of the first louver piece 9 is cut from the front direction orthogonal to the longitudinal direction of the first louver piece 9. It is also possible to use it as a standard for positioning the first louver piece 9 by performing alignment with the lower end opening edge.

Even if the first louver piece 9 of this embodiment is not composed of the inclined surface portions 8 and 8, the end region of the first louver piece 9 is inclined downward from the two edges of the lower end opening and the lower end portion is projected so that the fluorescent lamp is formed. It is sufficient if the structure is such that the light from 5 is incident, and it is applicable to various louvers.

EFFECTS OF THE INVENTION The present invention provides that the middle region, the end region, and the lower end portion of each of the second louver pieces protrude downward from the lower end opening edge of the lighting fixture body, and At the lower end of the end area of the louver piece, the both ends in the tube end direction of the fluorescent lamp are almost at the same height as the opening edge of the instrument body and are inclined from both ends to the lower end edge of the intermediate area, and Since it is arranged so that the light from the lamp is incident, the distance between the fluorescent lamp and the bottom edge becomes smaller as the emitted light of the fluorescent lamp decreases, and a dark portion is substantially formed in the end region. However, the unevenness of brightness at the lower end of the louver piece, whose brightness distribution decreases toward the tube end of the fluorescent lamp, becomes inconspicuous, and the aesthetic appearance as a lighting fixture is excellent, and the ceiling surface where this lighting fixture is embedded is Spoil the aesthetics of Without giving up, it is possible to provide a comfortable lighting environment for people in the room.

Further, when embedded in the ceiling surface, the protrusion of the lower end portion of the end region of the first louver piece is less noticeable, and the protrusion of the first louver piece is not emphasized. Not only does the appearance of the lighting fixture improve, but the ceiling surface in which the lighting fixture is buried does not feel uncomfortable, and a comfortable visual environment can be provided.

Furthermore, even if the light emitted from the fluorescent lamp or the diffusely reflected light from the lower end of the second louver piece irradiates the lower end of the end area of the first louver piece, the shadow thereof still has a collar portion in the longitudinal direction of the fluorescent lamp. Or it is not projected on the ceiling side.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a transverse sectional view, FIG. 2 is a longitudinal sectional view, FIG. 3 is a perspective view of a louver, and FIG. 1 ... Lighting device main body, 2 ... Bottom opening, 3 ... Curved edge as a collar portion, 5 ... Straight tube fluorescent lamp, 6 ... Louver, 9
...... First louver piece, 10 ...... Second louver piece, 12 ...... Stabilizer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiro Hayashi 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo headquarters (72) Inventor Takahiro Yamashiro 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Stock company Obayashi Tokyo Head Office (72) Inventor Koji Sato 1-4-2 Mita, Minato-ku, Tokyo Toshiba Denshi Co., Ltd. (72) Shinji Kodaira 1-4-2 Mita, Minato-ku, Tokyo Toshiba Denka Co., Ltd. (56) Reference JP 60-109101 (JP, A) JP 58-169702 (JP, A) Actual opening 53-105570 (JP, U) Actual opening 51-146887 (JP , U) Actual development Sho 62-73407 (JP, U)

Claims (1)

[Claims] 1. An embedded luminaire main body having a flange portion that abuts a ceiling surface at a lower end opening edge; a straight tube fluorescent lamp disposed in the luminaire main body; and a ballast provided in the luminaire main body. An intermediate region facing the intermediate part of the fluorescent lamp and end regions provided at both ends in the longitudinal direction of the intermediate region and facing the vicinity of the light emitting end of the fluorescent lamp. However, the lower end of the intermediate region projects downward from the lower end opening edge of the lighting fixture main body, and the lower end of the end region has both ends in the direction of the tube end of the fluorescent lamp at the lower end opening of the lighting fixture main body. A first light-diffusing louver piece that is approximately the same height as the edge, is inclined from both ends to the lower edge of the intermediate region, and is arranged so that light from the fluorescent lamp is incident thereon; Approximately perpendicular to the longitudinal direction of the fluorescent lamp A light diffusing member which is disposed in the lighting fixture main body under the fluorescent lamp so as to intersect with the intermediate region of the first louver piece, and whose lower end portion projects downward from the lower end opening edge of the lighting fixture main body. A plurality of second louver pieces having a sex; and an embedded luminaire.