JP2000106025A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of producing wide and soft illumination light as if plural lighting systems were integral illumination by reducing as much as possible boundaries between plural illumination covers covering a light source when plural light sources such as fluorescent lamps are used as surface illumination in a ceiling or a wall surface. SOLUTION: A fixed frame 5 is installed in the rear side (a light source side) of an illumination cover 4 equipped with a frame 7 having a large opening 6 for passing light and a light diffusion sheet 8 stretched so as to block the opening 6 and forming a flat illumination surface, plural guides 36 are movably held in the fixed frame 5 so as to become perpendicular to the fixed frame 5, and the illumination cover 4 is connected to one end of the plural guides 36 so that the illumination cover 4 becomes almost perpendicular to the guides 36. The illumination cover 4 is fixed to the specified position in the vicinity of the fixed frame 5, and a locking means such as a latch 45 capable of unlocking is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device provided on a ceiling, a wall, or the like, and more particularly, to a soft illuminating light from a wide flat surface by diffusing light from a light source such as a plurality of fluorescent tubes arranged in a plane. The present invention relates to a lighting device capable of generating the following.

[0002]

2. Description of the Related Art Conventionally, in galleries and the like, it has been desired that a large number of fluorescent tubes mounted on a ceiling surface have soft surface illumination in which the fluorescent tubes are not visible. There is a need for a lighting device that can function as integrated lighting. As one of the conventional measures against this demand, there is a lighting device provided with a lighting cover of an acrylic molded plate that is opaque to milky white. As another countermeasure, a lighting device using a light-transmitting non-combustible sheet mainly made of a light-transmitting inorganic fiber cloth such as glass cloth on a metal frame formed in a rectangular shape is also proposed as a lighting cover. Have been.

[0003]

However, in order to obtain a function as an integrated lighting over a wide area of the ceiling, in the case of the above-mentioned conventional lighting device provided with a lighting cover of an acrylic molded plate, an acrylic molded plate is required. However, there is a problem that the lighting device is easily distorted, it is difficult to form an integrated surface over a wide range, and since the acrylic plate itself is a flammable material, it is impossible to arrange the lighting device over a wide range due to legal regulations. On the other hand, in the case of an illuminating device using an illuminating cover formed by stretching a translucent non-combustible sheet on a frame, the generation of distortion can be suppressed by the rigidity of the metal frame, and the entire structure can be formed into a non-combustible structure. However, in order to arrange a large number of such lighting covers over a wide ceiling surface, a grid-like frame is attached to the ceiling surface, and the lighting cover is attached to the frame. The distance between the lighting covers cannot be made so small, and there is an area that does not emit light between the lighting covers.Therefore, even when attempting to perform integrated lighting over a wide area of the ceiling, the area between the lighting covers is located on the ceiling. There is a problem that black thick lines appear in a grid pattern and the appearance is deteriorated. Further, the light-transmitting non-combustible sheet used for the conventional lighting cover is made of a single light-transmitting inorganic fiber cloth such as a glass cloth, or the light-transmitting inorganic fiber cloth is coated or laminated with a non-flammable light-transmitting resin. However, this kind of non-combustible sheet has a problem in that the effect of hiding the fluorescent tube is not sufficient, and the fluorescent tube appears faint, making it impossible to form a completely integrated lighting.

The present invention has been made in view of such a problem, and when a ceiling surface or the like is surface-illuminated, a black line that does not irradiate light between a plurality of illumination covers covering a light source is made as thin as possible. It is an object of the present invention to provide a lighting device that can be made almost uninteresting. It is another object of the present invention to provide a lighting device provided with a lighting cover that can prevent a light source such as a fluorescent tube or the like from being viewed well, thereby enabling uniform surface illumination.

[0005]

According to the present invention, in order to mount a lighting cover for diffusing light from a light source at a predetermined position, a fixed frame is provided so as to be located on the back side (light source side) of the lighting cover. A plurality of guides are movably held on the fixed frame at substantially right angles, and the lighting cover is connected to one end of the plurality of guides such that the lighting cover is substantially at right angles to the guides. Further, the lighting cover is fixed at a predetermined position close to the fixing frame, and a locking means capable of releasing the fixing is provided. According to the present invention, by this configuration, the lighting cover can be fixed or removed at a predetermined position close to the fixed frame by engagement and release of the locking means, and the lighting cover is put in and out of the position to be fixed to the fixed frame. In this case, since the guide connected to the lighting cover is guided by the fixed frame, the lighting cover always moves linearly and stably while maintaining a constant posture (for example, in a horizontal state), Even large lighting covers can be easily moved, and since the lighting covers do not move in the horizontal direction, it is necessary to provide almost all gaps between adjacent lighting covers when arranging many lighting covers to form surface lighting. In addition, surface illumination with almost no black line can be formed between the illumination covers. Furthermore, when a sheet made of laminated glass fiber base fabric and a soft fluororesin containing hollow glass beads is used as a light diffusion sheet to be attached to the lighting cover, the light diffusion sheet can prevent a light source such as a fluorescent tube from being viewed easily. For this reason, it is possible to form a fully integrated illumination in which a light source such as a fluorescent tube is not visually recognized over a wide area such as a ceiling and there is almost no black line between illumination covers.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illumination device according to the present invention is a light source and an illumination cover arranged to cover the light source for diffusing the light from the light source. The illumination device has a large opening for transmitting light. It is stretched so as to cover the formed frame and its opening,
A lighting cover having a light diffusion sheet forming a flat lighting surface; and a fixed frame for attaching the lighting cover, wherein the frame is provided on a rear side of the lighting cover arranged at a predetermined position covering the light source and the frame. A fixed frame fixedly provided at a position substantially overlapping the body, a plurality of linear guides movably held by the fixed cover and connected to the frame of the illumination cover at a substantially right angle; and The cover is fixed at a predetermined position close to the fixing frame, and has a locking means capable of releasing the fixing. In this way, by adopting a configuration in which the lighting cover is connected to a plurality of guides held movably in the axial direction on the fixed frame, the lighting cover can be stably taken in and out without moving in the lateral direction, In addition, when forming a surface illumination by arranging a large number of illumination covers, it is possible to reduce the distance between adjacent illumination covers, and to form an area illumination having almost no black line between the illumination covers. Furthermore, by providing the fixed frame at a position substantially overlapping the frame of the lighting cover, the fixed frame does not block light from the light source to the light diffusion sheet, and therefore, the illumination surface formed by the light diffusion sheet. Since the fixed frame is hidden by the lighting cover, the appearance of the lighting device is not deteriorated.

Here, the guide connected to the lighting cover is 3
It is preferable that at least two of the guides are provided, the two of which hold the illumination cover in a rotatable manner, and that the illumination cover is detachably attached to the other guides. With this configuration, after the lighting cover is pulled out from the predetermined position, the lighting cover can be turned and the light source can be widely opened.

The frame of the lighting cover is provided with a skirt for extending a light diffusing sheet on the front end side, and the outer periphery of the skirt is large enough to hide other parts of the frame and the fixed frame. It is preferable to set the value to With this configuration, the lighting cover completely covers the light source and the fixed frame, and the appearance is improved.

It is preferable that a tapered surface is formed on the inner peripheral surface of the front end of the skirt portion formed in the frame so that the opening formed by the skirt portion becomes larger as approaching the front end. With this configuration, most of the entire surface of the illumination cover becomes a surface on which light is radiated through the light diffusion sheet, and the frame body and the frame behind the illumination cover can be securely hidden, thereby improving the appearance.

[0010] It is preferable that the frame is assembled by arranging metal stamping members on four sides and connecting the corners with a metal plate and screws. With this configuration, the frame body can be easily manufactured to an accurate size, and has high strength and rigidity, and does not cause torsion or the like during use.

As the light diffusion sheet attached to the lighting cover, it is preferable to use a sheet made by laminating a soft fluororesin containing hollow glass beads on a glass fiber base cloth. The light-diffusing sheet of this configuration has excellent light-diffusing properties and does not cause visual recognition of the light source, and also has excellent light-transmitting properties. Because of its qualities, it can be used for non-combustible structures, and because of its excellent dimensional stability, it can be used stably for a long period of time.

[0012] In the lighting device according to the present invention, the lighting cover may include:
It is preferable to use a plurality of them arranged close to each other and on the same plane. With this configuration, it is possible to configure a wide area surface illumination in which black lines are hardly noticeable between the illumination covers.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a schematic perspective view showing an embodiment in which the present invention is applied to surface illumination of a ceiling, and (a), (b), and (c) show a procedure for opening one illumination cover. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a schematic cross-sectional view showing a part thereof in an enlarged manner. A lighting device, generally designated by the reference numeral 1, includes a light source 3 comprising
And a lighting cover 4 arranged to cover the light source 3
And a fixed frame 5 and the like, which is located on the back side (light source side) of the lighting cover 4 and on which the front cover 4 is attached. A large number of the illumination covers 4 are arranged close to each other so that the entire ceiling surface can perform surface illumination.

The illumination cover 4 has a frame 7 formed with a large opening 6 for transmitting light, and a flat end is provided on the tip side (opposite to the light source) of the frame 7 so as to cover the opening. It has a light diffusion sheet 8 forming an illumination surface. The frame 7 is
As shown in FIG. 4, the whole has a square shape. As long as the material of the frame 7 has the required strength, the material may be metal,
Although it is optional such as plastic, a metal is used in this embodiment. That is, the frame 7 of the present embodiment is formed of a metal (for example, aluminum) stamping die member 7A having the same cross section on each side, and assembled into a square shape. The outer dimensions (length of each side) of the frame 7 are not particularly limited,
It is preferable to set it to about 1 to 2 m. As can be clearly understood from FIGS. 5 and 6, the frame 7 has a clamp groove 11 for clamping the light diffusion sheet 8 on the outer surface thereof, and a skirt extending downward from the lower outer end of the clamp groove 11. Part 1
3, the position of the light diffusion sheet 8 is regulated by the tip 13a of the skirt portion 13. Also, screw holes 15 are provided at appropriate intervals on the bottom of the clamp groove 11.
Are formed. With this configuration, the light diffusion sheet 8 is stretched so as to close the opening surrounded by the tip 13 a of the skirt portion 13, the end portion is guided to the clamp groove 11, and the clamp square pipe 17 is pressed from above and the screw 18 is used. By fixing, the light diffusion sheet 8 can be attached (see FIG. 3). At this time, by applying an appropriate tension to a portion of the light diffusion sheet 8 which closes the opening surrounded by the tip 13a of the skirt portion 13, the light diffusion sheet 8 in this portion maintains a flat surface and has an extremely good appearance. A flat illumination surface can be formed.

3 and 5, the outer surface 13b of the skirt portion 13 is formed at right angles to the surface formed by the tip 13a (the illumination surface formed by the light diffusion sheet 8 stretched at the tip). The size is determined so as to be located outside the other part of the frame body 7 and outside the fixed frame 5 thereabove. With this configuration, when the lighting cover 4 is viewed from below, there is no portion protruding outside the skirt portion 13, so that the light diffusion sheet 8 covers the frame 7 and the appearance is improved. Further, when the illumination covers 4 are arranged side by side, the interval between the adjacent skirt portions 13 can be made extremely small, and the appearance also improves. In addition, the outer surface 13b of the skirt portion 13 is not limited to the case where the outer surface 13b is at a right angle to the illumination surface, but may be inclined. It is preferable from the viewpoint of improvement.

A tapered surface 13c is formed on the inner peripheral surface of the distal end of the skirt portion 13 so that the opening formed by the skirt portion becomes larger as approaching the distal end. When such a tapered surface 13c is formed, a region of the light diffusion sheet 8 stretched at the front end of the frame 7 that does not contribute to illumination is limited to an extremely narrow region at the front end 13a of the skirt portion 13. Moreover, since the light from the light source is also emitted in the oblique direction as shown by the arrow B, when the lighting cover 4 is viewed from below, not only does the entire surface of the lighting cover 4 appear to emit light, As shown in FIG. 3, when the lighting covers 4 are arranged close to each other, there is an advantage that the spaces between the lighting covers 4 become inconspicuous, and the entire surface on which the large number of lighting covers 4 are arranged appears to emit light. . Skirt part 1
The outer corner of the tip 13a of the third member 3 has a small radius so as not to damage the light diffusion sheet 8. It is preferable that the roundness be as small as possible as long as the light diffusion sheet 8 is not damaged, because the width of a region that does not contribute to illumination can be reduced. As a specific numerical example, the thickness of the skirt portion 13 is selected to be about 5 mm, and the tip 13a of the skirt portion 13 is selected.
The radius of the outer corners is selected to be about 0.5 to 2 mm, more preferably about 1 mm, and the width of the tip 13a (the width between the tip of the tapered surface 13c and the outer surface 13b) is 1.5 to 3 m.
m, and more preferably about 2 mm. By adopting these values, the illumination cover 4 having an extremely good appearance can be formed.

The length of the skirt portion 13 is set to a certain length so that the shadow of the inner corner portion 20 of the frame 7 is not reflected on the light diffusion sheet 8. For example, when light passing through the corner portion 20 of the light from the light source closest to the frame 7 is irradiated as shown by an arrow B, the light enters the light diffusion sheet 8. The length of the skirt 13 is determined so as not to exist. The skirt portion 13 is preferably longer as the shadow of the corner portion 20 does not appear, but if it is too long, the rigidity is reduced and the light diffusion sheet 8 is bent by the tension. The length of the skirt 8 may be determined in consideration of these.

As can be seen clearly from FIGS.
On the upper and lower sides of the clamp groove 11, connecting grooves 22 and 23 having a substantially C-shaped cross section are formed. The punching die 7A on each side of the square frame 7 is cut at 45 degrees at the end face and abutted, and rectangular joint plates 25 and 26 made of a metal plate are inserted into the connecting grooves 22 and 23, respectively. Assembling is performed by applying L-shaped corner plates 28 and 29 made of a metal plate to the outer surface side, and fixing both with screws 30. As described above, a metal stamping die material is used as the frame body 7 and the corner portions are joint plates 25, 2.
6 and metal plates and screws 3 such as corner plates 28 and 29
By adopting the configuration of connecting by zero, the frame 7 can be manufactured and assembled to accurate dimensions without twisting, etc.
A large frame 7 having each side of 2 m can be easily manufactured. In addition, because of its high strength and rigidity, it can be used stably for a long period of time.

The light-diffusing sheet 8 attached to the frame 7 is a light-diffusing sheet capable of exhibiting a suitable light-transmitting property and a concealing property, and has an appropriate flexibility so that it can be stretched over the frame 7. It is optional as long as it has bending resistance, but among them, a laminated sheet made by sticking a heat-resistant translucent resin sheet to a translucent inorganic fiber cloth is heat-resistant, non-flammable, and stain-resistant. It is preferable because it has excellent properties. In this type of laminated sheet, as the inorganic fiber cloth, a glass fiber cloth is preferable, and as the heat-resistant and translucent resin sheet, a fluororesin, a Teflon resin, a silicon resin, or the like can be considered. Resins are most preferred. As the soft fluororesin, for example, produced by copolymerizing a monomer containing at least one fluorine-containing monomer and a monomer having both a double bond and a peroxy bond in the molecule, the peroxyl in the molecule A soft fluororesin obtained by graft-polymerizing vinylidene fluoride to a trunk polymer comprising a fluoropolymer containing a group and having a glass transition temperature of room temperature or lower can be mentioned. Such a soft fluororesin is commercially available from Central Glass Co., Ltd. as "Sefuralsoft" (trademark) (see "Plastics", March 1988).

Further, when the light diffusion sheet 8 is formed by laminating a soft fluororesin on a glass fiber cloth,
It is preferable to include hollow glass beads in the soft fluororesin. In particular, resin 1
0.5 to 5 parts by weight of hollow glass beads per 100 parts by weight, preferably 1.5 to 2.1, particularly 1.52 to 2.5.
When 1.53 hollow glass beads having an average particle size of about 8 to 12 μm are contained, a laminated sheet having a good balance between shielding properties and translucency can be obtained. That is, when the ratio of the hollow glass beads is less than 0.5 parts by weight, the light diffusing property is reduced, and the shielding property is reduced. On the other hand, when the proportion of the hollow glass beads is more than 5 parts by weight, the light transmittance is deteriorated and the film is difficult to form. As described above, the laminated sheet in which the soft fluororesin containing the hollow glass beads is laminated on the glass fiber base cloth is excellent in flexibility, bending resistance, antifouling property, heat resistance, light diffusion property, nonflammability, and light transmission. Rate 40% or more, turbidity 9
0% or more is obtained, and when this is used as the light diffusion sheet 8, the light source can be concealed well to form an illumination surface that shines uniformly and softly, and is excellent in heat resistance and nonflammability, and can be used stably for a long period of time. Benefits are obtained.

1 to 3, the fixed frame 5 for mounting the illumination cover 4 has a planar shape substantially equal to the frame 7 of the illumination cover 4 so as not to block light from the light source 3. The outer surface is the frame 7 of the lighting cover 4.
So that it is slightly inside from the outer surface of the skirt part 13 of
It is fixed by a suspension bolt 33 so as to be parallel to the ceiling 2. Although the members constituting the fixed frame 5 are not particularly limited,
In this embodiment, a square pipe made of steel is used. Receiving guides 34 are provided on the two opposite sides of the fixed frame 5 near the ends thereof at right angles to the fixed frame 5, and hold the linear guide 36 so as to be movable in the axial direction. I have. The guide 36 used here is arbitrary as long as it is a linear member. In this embodiment, a metal round pipe is used. The lower end of each guide 36 is connected to the upper surface of the frame 7 of the lighting cover 4 via connection fittings 38 and 39. Here, the illumination cover 4 of the four guides 36
When the lighting cover 4 is connected to the lower ends of the four guides 36, the frame 7 of the lighting cover 4 substantially overlaps the fixed frame 5 and the lighting cover 4 is perpendicular to the guide 36. (So that the lighting cover 4 is horizontal). With this configuration, the illumination cover 4 can be moved up and down while maintaining the horizontal state, and at this time, each guide receiver 34
In order to guide the guide 36 connected to the
Can move up and down stably at a certain position, and can stably move up and down even with the illumination cover 4 whose one side is as large as 2 m. The guide receiver 34 may have a configuration in which the guide 36 is simply guided by a sliding surface, but may use a linear motion ball bearing using a ball. The advantage that the up and down movement becomes smoother is obtained. At the upper end of each guide 36, a stopper 40 for retaining is attached.

Connection fittings 3 arranged on the left and right in FIG.
8 and 39, the left connecting fitting 38 (see FIG. 3)
The other connecting fitting 39 is connected to the guide 36 via a pivot pin 41, and the guide 3 is
6, the pin 42 is pulled out, and the connecting fitting 3
By releasing the connection between the guide 9 and the guide 36, the illumination cover 4 can be pivoted about the pivot pin 41. The number of guides 36 connected to the illumination cover 4 is not limited to four as shown in the embodiment, and may be three or five or more. In any case, the lighting cover 4 is pivotally connected to the lower ends of the two guides 36, and the other guides 36 are detachable from the lighting cover 4.

The lighting cover 4 and the fixed frame 5 are provided with locking means for fixing the lighting cover 4 at a predetermined position close to the fixed frame 5 and releasing the fixing.
In this embodiment, as shown in FIGS. 3, 4, and 7, a latch lock 4 is provided on the upper surface of the frame 7 of the illumination cover 4.
5 is provided, and a latch lock receiver 47 is provided on the fixed frame 5. The latch lock 45 includes a lock member 45b provided so that a tip thereof projects horizontally from a case 45a by a spring (not shown), a trigger member 45c for pulling back the lock member 45b, and a wire 45.
d, etc., and a circular arc surface 45e is formed on the top surface of the tip of the lock fitting 45b. On the other hand, the latch lock receiver 47
Is made of an L-shaped metal plate. With this configuration, FIG.
As shown in (a), when the tip of the lock fitting 45b protrudes above the latch lock receiver 47, the latch lock 45
Can be engaged with the latch lock receiver 47 to fix the lighting cover 4 to the fixed frame 5, and as shown in FIG.
The lighting cover 4 can be removed from the fixed frame 5 by pulling the lock fitting 45b by pulling d using an appropriate hook. Further, in order to fix the detached lighting cover 4 to the fixed frame 5, simply raising the lighting cover 4 causes the arcuate surface of the top end of the lock fitting 45b to come into contact with the latch lock receiver 47 and retreat, and the latch lock is locked. At the time when the catch 47 has passed, the lock fitting 45b is pushed out by a spring (not shown), and is brought into a state shown in FIG. The locking means is not limited to the illustrated latch lock 45, and a push-open / close lock (a structure in which the lock is performed by the first press and the lock is released by the next press) may be used. The latch lock 45 and the latch lock receiver 47 shown in the embodiment are preferable because they have advantages such as secure engagement, safety because they are not accidentally released, and the like.

2 and 3, the fixed position of the fixed frame 5 is such that the light diffusion sheet 8 at the tip (lower end) of the illumination cover 4 fixed to the fixed frame 5 is appropriately separated from the light source 3,
The light diffusion sheet 8 is determined so that uniform diffusion of light and prevention of shadows can be achieved. Specifically, it is preferable that the light diffusion sheet 8 be positioned at a position at least about 200 mm away from a fluorescent tube as a light source. As shown in FIG. 2, the length of the guide 36 connected to the lighting cover 4 can be increased even when the lighting cover 4 is raised to a position where the lighting cover 4 is fixed to the fixed frame 5.
In order to prevent the upper end of the light guide 6 from contacting the ceiling 2 and the light source 3, the lighting cover 4 is connected to the stopper 4
When the lighting cover 4 is pivoted about the pivot pin 41 when the lighting cover 4 is pivoted around the pivot pin 41 when the lighting cover 4 is pulled down until it hits the upper surface of the fixed frame 5, the lighting cover 4 does not hit the lighting cover 4 at an adjacent position. It is set so that it can be lowered.

Further, as can be clearly seen from FIG. 3, the lighting cover 4 and the fixed frame 5 are arranged such that the skirt portion 7 of the adjacent lighting cover 4 and the wire of the latch lock 45 shown in FIG. It is attached as close as possible to leave a small gap 50 (for example, a gap of about 2 to 5 mm) small enough to allow a hook for hooking 45d. As described above, since the skirt portion 7 is located at the outermost position in the lighting cover 4 and the fixed frame 5, it is possible to reduce the space 50 between the adjacent skirt portions 7 without any problem. .

In the illuminating device 1 having the above-described structure, as shown in FIG. 1A, a large number of illuminating covers 4 are arranged close to each other, and the light from the light source is diffused by the light diffusion sheet of the illuminating cover 4. As a result, the entire surface of the illumination cover 4 emits soft light, and a wide surface illumination is formed. Here, there is a gap 50 (see FIG. 3) between the respective lighting covers 3, but since this gap 50 is extremely small and light is generated as shown by an arrow B in FIG. The gap 50 is hidden, and the lattice-shaped black lines are hardly conspicuous.

Next, the illumination cover 4 is used to replace the light source.
7, a hook is inserted through the gap 50 between the lighting covers 4, and as shown in FIG.
Is pulled, the lock fitting 45b is retracted, and the engagement with the latch lock receiver 47 is released. This allows
Since the illumination cover 4 is detached from the fixed frame 5 and becomes movable, it is pulled out downward as shown in FIG. 1 (b).
At this time, the four guides 36 connected to the lighting cover 4
Is guided by the guide receiver 34 (see FIG. 3),
The illumination cover 4 is pulled out stably while maintaining a horizontal state. After lowering the illumination cover 4 to a position where the stopper 40 at the upper end of the guide 36 contacts the fixed frame 5, the guide 36 located on the right side in FIG. 2 is removed from the illumination cover 4, and as shown in FIG. Then, the illumination cover 4 is turned around the pivot pin 41. Thereby, the lower part of the light source 3 can be widely opened, and operations such as replacement of the fluorescent tube can be performed.

In order to return the opened lighting cover 4 to its original position, first, the lighting cover 4 is turned horizontally and connected to the lower end of the guide 36, and then the lighting cover 4 is pushed up. Also at this time, the four guides 36 connected to the illumination cover 4 are guided by the guide receivers 34 of the fixed frame 5, so that the illumination cover 4 moves vertically stably while maintaining a horizontal state. When the lighting cover 4 is pushed up to the upper limit position, the lock fitting 45b of the latch lock 45 shown in FIG.
7 comes into contact with the latch lock receiver 47 and is retracted. When the latch lock receiver 47 passes by, it is pushed out by a spring (not shown), and becomes engaged as shown in FIG. Thereby, the lighting cover 4 is fixed to the fixed frame 5. In this manner, the latch lock 45 is automatically engaged with the latch lock receiver 47 by simply pushing up the lighting cover 4, and the lighting cover 4 can be set at a predetermined position.

In the above embodiment, the case where a large number of illumination covers 4 are arranged to form a wide surface illumination has been described. However, the illumination device of the present invention is not limited to this case and uses only one illumination cover. The case is also applicable. Even when one lighting cover is used, the lighting cover can be arranged very close to the surrounding wall surface, and a lighting surface with a good appearance can be formed.

[0030]

As described above, in the lighting device of the present invention, a plurality of lighting covers for diffusing light from a light source are provided on a fixed frame provided on the back side so as to be movable in the axial direction. By connecting to one end of the guide, the lighting cover can be moved linearly and stably while maintaining a certain posture, and even a large lighting cover can be easily opened and closed. In addition, when forming a surface illumination by arranging a large number of illumination covers, there is almost no need to provide a gap between adjacent illumination covers, and there is an effect that surface illumination with almost no black line can be formed between the illumination covers.

Here, the guide connected to the lighting cover is 3
When the lighting cover is rotatably held with respect to two of them and the lighting cover is detachable with respect to the other guides, the lighting cover can be swung after being pulled out from a predetermined position. Thus, the effect that the light source can be greatly opened can be obtained.

Further, a skirt portion for providing a light diffusing sheet is provided on the front end side of the frame body of the lighting cover, and the outer periphery of the skirt portion is large enough to hide other parts of the frame body and the fixed frame. With this setting, the lighting cover covers all of the light source and the fixed frame, and the effect of improving the appearance is obtained.

Further, a tapered surface may be formed on the inner peripheral surface of the front end of the skirt portion formed in the frame so that the opening formed by the skirt portion becomes larger as approaching the front end. Most of the entire surface is a surface to be irradiated with light through the light diffusion sheet, and the frame or frame behind the surface can be securely hidden, and the effect of improving the appearance can be obtained.

Further, if the frame is constructed by arranging metal stamping members on four sides and connecting the corners with a metal plate and screws, the frame can be easily manufactured to accurate dimensions. In addition, the strength and rigidity are large, and the effect of preventing twisting or the like during use is obtained.

When the light diffusion sheet attached to the lighting cover is made of a glass fiber base cloth laminated with a soft fluororesin containing hollow glass beads, the light diffusion sheet is excellent and the light source can be visually recognized. And not only
It has excellent translucency and is nonflammable, so it can be used in a nonflammable structure, and because it has excellent dimensional stability, it can be used stably for a long time.

When a plurality of the illumination covers are arranged and used so as to be close to each other and on the same plane, it is possible to form a large-area surface illumination in which black lines are hardly conspicuous between the illumination covers. Is obtained. In particular, when a light diffusion sheet obtained by laminating a soft fluororesin containing hollow glass beads on a glass fiber base cloth is used, it is possible to reliably prevent a light source such as a fluorescent tube from being viewed. Therefore, it is possible to obtain an advantageous effect that an integrated lighting unit that emits light uniformly and softly over a wide area can be formed.

[Brief description of the drawings]

FIGS. 1A, 1B, and 1C are schematic perspective views showing a procedure for opening a lighting cover in an embodiment in which the present invention is applied to ceiling surface lighting.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a schematic cross-sectional view showing an enlarged part of the portion shown in FIG. 2;

FIG. 4 is a schematic plan view of a lighting cover.

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is an exploded schematic perspective view showing a corner portion of a frame of the lighting cover.

FIGS. 7A and 7B are schematic perspective views illustrating engagement and release of a latch lock and a latch lock receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Illumination device 2 Ceiling 3 Light source 4 Illumination cover 5 Fixed frame 6 Opening 7 Frame 8 Light diffusion sheet 13 Skirt part 34 Guide receiver 36 Guide 38, 39 Connection fitting 40 Stopper 41 Axis pin 45 Latch lock 47 Latch lock receiver

Continued on the front page (72) Inventor Katsuhiro Oba 2-25-1-103 Harayama, Urawa-shi, Saitama (72) Inventor Sadao Seto 1-13-1-203 Haraki, Ichikawa-shi, Chiba

Claims (7)

[Claims] 1. A light source, a lighting cover arranged to cover the light source for diffusing light from the light source, and a frame body having a large opening for transmitting light and closing the opening And a fixed frame for mounting the lighting cover, the back surface of the lighting cover disposed at a predetermined position covering the light source. Side and a fixed frame fixedly provided at a position substantially overlapping the frame, and a plurality of linear frames held movably on the fixed cover and connected to the frame of the lighting cover at a substantially right angle. A lighting device comprising: a guide; and a locking means for fixing the lighting cover at a predetermined position close to the fixing frame and releasing the fixing. 2. The frame is connected to three or more guides, two of which are rotatably held and detachable from other guides. The lighting device according to claim 1. 3. A frame body of the lighting cover has a skirt portion for stretching a light diffusion sheet on a side opposite to a light source,
3. The lighting device according to claim 1, wherein an outer circumference of the skirt is set to a size that can hide other portions of the frame and the fixed frame. 4. 4. A tapered surface is formed on an inner peripheral surface of a tip of a skirt portion formed on the frame so that an opening formed by the skirt portion becomes larger as approaching the tip. The lighting device according to claim 3. 5. The frame according to claim 1, wherein the frame is assembled by arranging metal stamping members on four sides and connecting corners with a metal plate and screws. The lighting device according to claim 1. 6. The light diffusion sheet attached to the lighting cover, wherein a soft fluororesin containing hollow glass beads is laminated on a glass fiber base cloth. The lighting device according to claim 1. 7. The lighting device according to claim 1, wherein a plurality of the lighting covers are arranged close to each other and on the same plane.