JP2533054B2 - Indirect illuminator and indirect illuminator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indirect illuminator and an indirect illuminator.

[0002]

2. Description of the Related Art A conventional indirect illuminator and its indirect illuminator are generally of the type shown in FIG. That is,
The indirect illuminator has front and rear sockets c for mounting a fluorescent lamp b in the lengthwise direction in the vicinity of the lower ends of both side plates a1 and a2 of a reflecting frame plate a which is curved downward. A lamp cover d made of a bent long plate composed of a long horizontal plate d1 covering the lower surface and the inner side surface and a long slanted plate d2 formed by bending the tip thereof obliquely upward is provided on each side plate a1, It is fixed to the lower end of a2. To configure an indirect lighting device on the ceiling using this, it is suitable to insert a predetermined portion of the ceiling plate e of the building, generally, one in which a desired number of the above indirect illuminators are arranged in a line. A long rectangular cutout hole f having a certain length and width is cut out to be formed, and a plurality of hanging rods h are hung from a fixed base surface g above the ceiling above the cutout hole f. A long mounting frame plate i having a U-shaped cross section having a full length and width is inserted through the cutout hole f, and is inserted into a through hole provided in the top plate i1.
The threaded portion at the lower end of the suspension rod h is attached to the back of the ceiling with a nut. A ballast j connected to an external power source is provided on the back surface of the top plate of the frame plate i. In this way, after the work of attaching the longitudinal frame plate i having a U-shaped cross section for attaching the indirect illuminator to the back of the ceiling is completed, the indirect illuminator is attached to the frame plate i as follows. Install. That is, in a state where the indirect illuminator is inserted into the inner space of the frame plate i through the cutout hole f as shown in the drawing, the indirect illuminator and the both side plates a1 and a2 of the reflection frame plate a are Both sides of frame i for mounting
The overlapping side plates a1 and i1 and a2 are overlapped with i1 and i2 by a fixing tool k that is overlapped with i1 and i2 and is inserted into an insertion hole provided at the bottom of each of them.
The indirect illuminator is attached to the attachment frame plate i by sandwiching and fixing i2. On the other hand, the lead wires l, 1 derived from the respective ballasts j disposed on both sides of the mounting frame plate i are inserted between the overlapped side plates a1 and i1 or a2 and i2, From the middle thereof, as shown in the drawing, the through holes provided in the side plates a1 or a2 of the both side plates a1 and a2 of the reflection frame plate a are inserted and led out into the internal space m of the reflection frame plate a, An indirect lighting device is configured by connecting the lead-out end to the terminal n provided on each socket c.

[0003]

In the conventional indirect illuminator described above, the lamp cover d for covering the fluorescent lamp b is fixed to the side plates a1 and a2 of the reflection frame plate a. Bring inconvenience. When it is necessary to replace the fluorescent lamp b after the indirect illuminator is mounted on the mounting frame plate i as described above, the operator uses the cutout hole f to insert the internal space of the reflective frame plate a. It is necessary to put at least the shoulder in m and perform the replacement work of the fluorescent lamp b in a narrow space, and the replacement work is troublesome. Since the above replacement work is required, it is necessary to make the height space m of the reflection frame plate a large in advance, which is bulky and has a U-shaped cross section having a correspondingly large height space. Since it is necessary to manufacture the mounting frame plate i, the manufacturing cost is increased, and further, the indirect illuminator cannot be mounted in a relatively small space in the height space above the ceiling.

Further, in order to construct the above-mentioned conventional indirect lighting device, it is necessary to provide connection line insertion holes in both side plates a1 and a2 of the reflection frame plate a and insert the connection line insertion holes into the connection line insertion holes, which requires a manufacturing cost. Wiring work is complicated.

After installing the above-mentioned indirect lighting device,
In order to hide the gaps f1 and f2 generated between the side plates i1 and i2 of the mounting frame plate i and the ceiling plate e, a separately formed long plate o having an appropriate width is attached and covered from the outer surface thereof. It is necessary and the installation work is required.

[0006]

DISCLOSURE OF THE INVENTION The present invention eliminates the disadvantages of the above-mentioned conventional indirect illuminators, and the first object of the present invention is to facilitate the replacement work of fluorescent lamps and, if necessary, Both sides and the ceiling of the frame plate for mounting, which can be applied to a place with a small height space and can be constructed as a low profile and thin type
Preparing for a good installation work that hides the gap between the board
Indirect illuminator capable of providing a fluorescent lamp, the inner surface of both side plates of the reflective frame plate is provided with sockets for mounting fluorescent lamps, respectively, and the lower surface of the fluorescent lamp is covered in a normal state.
A long horizontal plate and an upward long line that covers the inner surface of the fluorescent lamp.
Single rotatably mounted Rutotomoni the lamp cover of the lamp cover consisting of bent plate elongated consisting of side plates
On the outer edge of the long horizontal plate, outward from both side plates of the reflection frame plate
Both sides when protruding and attached to the mounting frame plate
The gap between the plate and the ceiling plate on both sides of the cutout is the bottom surface.
It is formed by extending a long covering plate portion for covering from .

Further, in the indirect illuminator of the present invention which achieves the above object, there is provided an indirect illuminator in which the lamp cover is rotatable by a simple mechanism and which can be manufactured easily and at low cost. The lamp cover is composed of one long bent plate composed of a long horizontal plate that covers the lower surface of the fluorescent lamp in a normal state and an upward long side plate that covers the inner side surface of the fluorescent lamp. A pair of mounting ears arranged in the longitudinal direction on the inner surfaces of both side plates of the reflection frame plate and an inner surface of the long horizontal plate of the lamp cover arranged in the longitudinal direction in the longitudinal direction. The pair of connecting ears are rotatably connected to each other via respective connecting pins, and the lamp cover is rotatably attached.

Further, the present invention provides an indirect illuminator having a lamp cover which is automatically and stably maintained at a position for covering the lower surface and the inner surface of the fluorescent lamp in a normal state.
The lamp cover is formed such that a length of a horizontal plate portion inside a position of a connecting ear connected to the connection pin and an inner plate portion including the side plate is longer than a length of an outer plate portion of a horizontal plate outside the position. It will be done.

Furthermore, the present invention eliminates the need for a separate covering operation for covering the gap between the indirect lighting device and the cutout hole in the ceiling plate, which has been conventionally required, and when mounted on the ceiling,
An indirect illuminator capable of automatically covering the gap is provided, wherein both sides of the reflection frame plate are provided on the outer edges of the long horizontal plates of the lamp cover arranged on the left and right sides of the reflection frame plate. It is formed by extending a long covering plate portion projecting to the outside of the plate.

Further, the present invention provides an indirect illumination device which has the advantages of eliminating the above-mentioned inconveniences of the conventional indirect illumination device and being able to easily replace the fluorescent lamp. By using a hanging rod that hangs down from the surface, a long mounting frame plate with a U-shaped cross section equipped with a ballast for connecting to the power source on the inner surface is used to cover the upper surface of the long cutout hole provided in the ceiling plate therebelow. The indirect illuminator of any one of the above-mentioned present inventions is suspended in the inner space of the U-shaped frame plate, and both side plates of the reflection frame plate and the U-shaped frame are fixed by a fixture. Both side plates of the plate are sandwiched and fixed, and each ballast is connected to each socket on both sides by a connecting wire.

Further, the present invention solves the above-mentioned drawbacks of the conventional indirect lighting device and provides an indirect lighting device which can easily connect the ballast and the socket of the fluorescent lamp. A plate-like spacer is interposed between each plate of both side plates and each plate of both side plates of the reflection frame plate of the indirect illuminator to be superposed, and lead to a vertically penetrating space formed between the plate-like spacers. The wire is inserted, and the lead-out end is connected to the terminal provided on the socket across the lower end of the side plate of the reflection frame plate.

[0012]

According to the present invention, since the lamp cover is rotatably provided on the indirect illuminator, as shown in the following embodiment, as shown in FIG. Since the lower part of the fluorescent lamp is opened when it is rotated as shown in FIG. 6 from the state in which the fluorescent lamp is covered over, the fluorescent lamp can be freely exchanged from the lower part of the ceiling through the opening surface.

In this case, the lamp cover is composed of a long horizontal plate and a long side plate integrated inside the horizontal plate, and the horizontal plate inside the position of the ear connected to the connecting pin on the upper surface of the horizontal plate. The inner plate portion of the lamp cover is made heavier than the outer plate portion by making the length of the inner plate portion, which is composed of the side plate and the side plate, longer than the length of the outer plate portion of the horizontal plate outside the position of the ear. Therefore, in the lamp cover, the inner plate portion always has a downward rotation tendency around the connecting pin, while the outer plate portion has an upward rotation tendency. ,
The covering state of the fluorescent lamp is automatically maintained by contacting the lower end of the reflection frame plate. In this case, in particular, when the cover plate portion is extended to the horizontal plate, when the device is attached to the mounting frame plate through the cutout hole in the ceiling, the cover plate portion is automatically provided on both sides of the cutout hole. Since it comes into contact with the lower surface of the side edge of the ceiling plate, the gap between the indirect lighting device and the cutout hole can be automatically and stably covered. Further, as shown in FIG. 6, when the fluorescent lamp is rotated during replacement, a downward load is applied to the inner plate portion, which has a relatively large weight, so that the inner plate portion is constantly displaced toward the lower surface open side. Power is generated and a stable open state is secured.

Further, in the above indirect lighting device of the present invention, the lead wire led out from the ballast is an insertion hole formed of a space vertically penetrating between the side plate of the mounting frame plate and the side plate of the reflection frame plate. Since the reflection frame plate is led out through the lower end of the reflection frame plate and connected to the terminal portion provided in the socket, the wiring work is easy.

[0015]

Embodiments of the present invention will now be described with reference to the accompanying drawings. 1 to 6 show an indirect illuminator and an indirect illuminator therefor according to an embodiment of the present invention. In the drawings, reference numeral 1 denotes a reflecting frame plate which is concavely curved downward and has a predetermined width and length. The reflection frame plate 1 is a lightweight and corrosion-resistant plate material such as an aluminum decorative plate having a bright surface, other metal plates, and a synthetic resin molding plate processed on a light-colored reflective coating surface suitable for reflecting light. It is preferable to make them. In the example shown, it has a central reflecting surface that is curved downward in an arc shape, and on both sides in the width direction of the reflecting surface, in the example shown, both side plates with relatively low height 1
It was formed by hanging a and 1b in a relatively low space.

On the inner surfaces of both side plates 1a and 1b of the reflection plate 1, a pair of sockets 2 for mounting fluorescent lamps are installed in the lengthwise direction, respectively. 2a shows a socket mounting portion. According to the present invention, the fluorescent lamp 3 mounted between the sockets 2 and 2 is rotatably provided over the entire length thereof so as to cover the lower surface of the fluorescent lamp 3 and the inner surface thereof, whereby the indirect illuminator A of the present invention is provided.
Was configured. In the illustrated embodiment, the lamp cover 4 extends over the entire length of both side plates 1a and 1b of the reflection frame plate 1, and a long horizontal plate 5 that covers the lower surface of the fluorescent lamp 3 and the inside of the horizontal plate 5. And a long side plate 6 that extends obliquely upward from the edge and covers both side surfaces of the fluorescent lamp 3, and generally bends an aluminum decorative plate of a predetermined length and width colored blue or the like, It is preferable to form the horizontal plate 5 and the side plate 6, but needless to say, it is not limited to this, and for example, a synthetic resin molded plate may be used. Then, the lamp cover 4 made of this elongated bent plate is rotatably attached to each side plate 1a, 1b. The attachment can be obtained, for example, by the following simple structure.

That is, a pair of front and rear mounting ears 7, 7 are provided on the inner surface of each of the side plates 1a, 1b of the reflecting frame plate 1 in the longitudinal direction near both ends of the plate. On the other hand, on the upper surface of the horizontal plate 5 of the lamp cover 4, in the vicinity of both ends of the plate in the lengthwise direction, a pair of front and rear connecting ears 8, facing the mounting ears 7, 7, are provided. 8 are projectingly provided, the connecting pin 9 is inserted into the opposing pin holes provided in each of the mounting ears 7 and the connecting ears 8 that face each other, and the insertion ends are caulked and bonded to each other. , 9 around the connecting ear 8,
Each lamp cover 4 is rotatably attached to each side plate 1a, 1b via 8.

In this case, the lamp cover 4 has a length of an inner plate portion which is a combination of the side plate 6 and the horizontal plate portion inside the position of the connecting ear 7 which is rotatably connected to the connecting pin 9. , The outer plate portion of the horizontal plate 5 outside the position of the ear 7 is formed longer, so that the inner plate portion of the lamp cover 4 is
The lamp cover 4 is heavier than the outer plate portion, and thus the lamp cover 4 is always centered on the connecting pin 9 as shown by the arrow in FIG. The outer plate portion has a tendency to rotate downward, and as a result, the outer plate portion abuts on the lower end of the reflection frame plate so that the lamp cover is automatically covered. ,
At the time of replacing the fluorescent lamp 3, the lamp cover 4 is rotated and inverted with respect to the inner plate portion thereof as shown in FIG. When the open surface 10 is formed, the load on the inner side plate portion tends to rotate in the direction of the arrow in the figure, so that the open state of the lower surface of the fluorescent lamp 3 can be stably maintained. , Therefore the lamp cover 4
The hands of the fluorescent lamp 3 are released so that the fluorescent lamp 3 can be replaced freely and easily.

The lamp covers 4 and 4 arranged on the right and left sides of the reflection frame plate 1 are provided on the outer edge of the long horizontal plate 5 outside the respective side plates 1a and 1b of the reflection frame plate 1. It is preferable to extend the protruding long covering plate portions 5a, 5a. According to this, as shown in FIG. 1, the indirect illuminator of the present invention has a U-shaped cross section which is suspended and fixed by a plurality of suspension rods 12 hanging from a fixing base surface 11 on the ceiling. When the ceiling plate 14 is attached to the attachment frame plate 13 through the cutout hole 15 formed by cutting out the oblong rectangular shape, the attachment frame plate is attached by the covering plate portion 5a of the lamp cover 4 in the attachment. Both side plates 13a and 13b of 13 and ceiling plates 14 and 14 on both sides of the cutout hole 15
Since the gaps 15a and 15b generated between the and the bottom are automatically covered from the lower surface, it is possible to save the labor of attaching and covering separately prepared long covering materials as in the conventional case. Also in this case, the horizontal plate 5 of the lamp cover 4
The outer plate of the lamp cover 4 is configured to be lighter in weight, including the cover plate 5a, shorter than the inner plate, and the lamp cover 4 has the outer plate centered on the pin 9 as described above. As a result, the outer edge of the covering plate portion 5a automatically moves to the ceiling plate.
It is preferable that the lower surface of the fluorescent lamp 3 is brought into contact with the lower surface of the fluorescent lamp 14 so that the lower surface and the inner surface of the fluorescent lamp 3 are automatically covered. I was also. It is preferable to design so that the horizontal plate 5 is kept horizontal during this contact,
In the case shown in the drawing, the horizontal state of the horizontal plate 5 is obtained by the bent edge 5b in which the outer edge of the cover plate portion 5a is vertically bent upward.

Next, an embodiment in which an indirect illuminator A of the present invention is used to form an indirect illuminator on the ceiling of a building will be described in detail. A predetermined length and width suitable for inserting a plurality of desired indirect illuminators A, A, ... Of the present invention in a line at a predetermined position of the ceiling plate 14 in a state in which adjacent end faces are brought into contact with each other. Is provided with a very long oblong cutout hole 15 having a space above the cutout hole 15, in the illustrated embodiment, above the ceiling above the ceiling having a relatively shallow space space, for example, in the horizontal fixing base surface 11. , 2 suspension rods 12, 12, ... Consisting of bolt rods for suspending and supporting a desired number of indirect illuminators A, two rows in the lateral direction in the width direction, and three in each of the luminaires A in the longitudinal direction. The lower end of each of the suspension rods 12, 12, ... In which the mounting frame plate 13 having a U-shaped cross section common to the indirect illuminators A, A, ... Is inserted and inserted into the sheet piles 13c, 13c ,. By tightening and fixing the nuts to the threaded portion of the unit by a conventional method, each unit A is attached sequentially in the length direction. Arranged in a combined state,
The indirect illuminators A of the present invention are attached to the respective mounting frame plates 13 thus attached as described later, and wiring is carried out to complete the respective indirect illumination devices B of the present invention.

Next, since the mounting and wiring work of each indirect illuminator A to the mounting frame plate 13 is the same, the mounting and wiring work of one indirect illuminator A will be described below. As shown in FIG. 1, the indirect illuminator A of the present invention is
The ceiling plate 14 is inserted into the mounting frame plate 13 above through the cutout hole 15, and the both side plates 1a and 1b of the reflecting frame plate 1 are located below the both side plates 13a and 13b of the mounting frame plate 13. On both inner surfaces of the reflective frame plate 1 as shown in FIGS.
1a and 1b are provided in the front and rear positions near both ends in the longitudinal direction, and are provided in the front and rear positions in circular holes 1c respectively provided in the mounting frame plates 13a and 13b and in the vicinity of both ends in the longitudinal direction. The fixing tool 16 is inserted into the insertion hole formed by fusing the horizontal elongated hole 13d, and the base portion thereof is rotated by 90 ° so that the head portion thereof intersects with the elongated hole 1c. And 1b,
13b is sandwiched, and thus, the work of mounting the indirect illuminator A of the present invention on the mounting frame plate 13 is completed. On the other hand, lead wires 18 and 18 from each ballast 17 connected to an external power source, which is previously disposed on the back surface of the top plate 13c connected to the power source, are disposed on the left and right sides of the indirect illuminator in the front and rear respectively. The indirect lighting device B of the present invention is constructed by connecting to the terminal portions 19 provided in the respective sockets 2.

In this case, according to the present invention, it is preferable to wire the ballast 17 and the lead wire 18 of each socket 2 as follows. That is, as shown clearly in FIGS. 3 to 5, the indirect illuminator A of the present invention has a plate-like shape when the side plates 1a and 1b of the indirect illuminator A are superposed on the side plates 13a and 13b of the mounting frame plate 13, respectively. A space 21 is formed between the plate-like spacers 20 and 20 with a spacer 20 interposed therebetween, and the lead wire 18 led out from the ballast 17 is inserted into the space 21 and the lower end portion of the lead is reflected by the reflection. The lower end of the side plate 1a (or 1b) of the frame plate 1 is traversed and led out into the internal space m, and this lead-out end is connected to the terminal 19 provided in the socket 2. As a result, the wiring work becomes easier as compared with the conventional case where the lead wire is inserted through the insertion hole previously provided in the side plate of the reflection frame plate and led out.
In the drawing, 20a indicates an insertion hole through which the shaft of the fixture 16 is passed.

[0023]

As described above, according to the present invention, since the lamp cover for covering the fluorescent lamp of the indirect illuminator from the lower surface to the inner side surface is rotatably provided, when the fluorescent lamp is replaced,
Rotate the lamp cover to open the bottom surface of the fluorescent lamp,
The indirect illuminator can be easily replaced from below the ceiling, and the indirect illuminator can be provided as a low profile thin indirect illuminator if necessary. Therefore also, low ceiling height space traditional, can be attached to the location that could not be mounted.

Further, the lamp cover is formed by a horizontal plate that covers the lower surface of the fluorescent lamp and a side plate that covers the inside surface of the horizontal plate that is integral with the horizontal plate, and is located inside the position where the horizontal plate is connected to the connecting pin. Since the length of the portion is formed to be longer than the length of the outer plate portion, the lamp cover can always be automatically kept in the covering state of the fluorescent lamp at all times, and at the time of replacement of the fluorescent lamp, the lamp cover can be kept underneath. When the inner plate is rotated above the fluorescent lamp to the inversion position in order to open the lamp, the load itself causes a load in the opening direction, and the opened state can be maintained stably, and the fluorescent lamp can be replaced. It can be done easily.

Further, since the long covering plate portion is extended to the outer edge of the long horizontal plate of the lamp cover, the indirect illuminator according to the present invention can be installed in the ceiling space through the cutout hole provided in the ceiling plate. to attach taken to mounting frame plate attached taken up, at the same time as its attachment, it is possible to coat the gap occurring between the mounting frame plate and the ceiling plate from the lower surface, the above-mentioned conventional
Installation work to cover and install with a separately prepared long plate
It is possible to dispose of the indirect lighting device on the ceiling surface, which can be abandoned, is a simple operation, and has a good appearance.

When the indirect illuminator of the present invention is attached to the mounting frame plate by a fixture, a plate spacer is interposed between the side plate of the reflection frame plate and the side plate of the mounting frame plate of the illuminator. Then, in the vertically penetrating space formed between them, the lead wire led out from the ballast is inserted downward, and the lower end of the insertion is crossed over the lower end of the reflection frame plate, and when connecting to the contact terminal of the socket, Wiring work can be facilitated and the indirect lighting device of the present invention can be installed on the ceiling with high efficiency.

[Brief description of drawings]

FIG. 1 is a side view of an indirect lighting device including an indirect illuminator of the present invention.

FIG. 2 is a front view in which a part of the line II-II of FIG. 1 is cut.

FIG. 3 is an enlarged side view in which a part of the device of FIG. 1 is longitudinally cut.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

5 is a lateral view taken along line VV of FIG.

FIG. 6 is a side view of the indirect lighting device of the present invention shown in FIG. 1 in an operating state when a fluorescent lamp is replaced.

FIG. 7 is a side view of an indirect lighting device including a conventional indirect illuminator.

[Explanation of symbols]

1 Reflective frame plate 1a Side plate 1b
Side plate 2 Socket 3 Fluorescent lamp 4
Lamp cover 5 Horizontal plate 5a Cover plate part 6
Side plate 7 Ear for attachment 8 Ear for connection 9
Connecting pin 10 Opening surface 11 Base for fixing 12
Hanging rod 13 Frame plate for mounting 13a Side plate 13b
Side plate 14 Ceiling plate 15 Cutout hole 15a
Gap 15b Gap 16 Nut 17
Ballast 18 Lead wire 19 Terminal 20
Plate-shaped spacer 21 Space A Indirect illuminator B of the present invention
Indirect lighting device of the present invention

Claims (6)

(57) [Claims] 1. A socket for mounting a fluorescent lamp is provided on each of the inner surfaces of both side plates of the reflection frame plate in a normal state.
And a long horizontal plate that covers the bottom surface of the fluorescent lamp in
One piece consisting of an upward long side plate covering the inner surface of the
The outer edge of the horizontal plate of <br/> with Rutotomoni the long length of the lamp cover taken rotatable lamp cover consisting of bent plate elongated in
To the outside of both sides of the reflective frame plate for mounting
When attached to the frame plate, both side plates and both sides of the cutout hole
A long cover that covers the gap created with the ceiling plate from the bottom surface.
An indirect illuminator with a cover plate extended . 2. The lamp cover comprises a long horizontal plate that covers the lower surface of the fluorescent lamp in a normal state and an upward long side plate that covers the inner surface of the fluorescent lamp. It consists of a bent plate, and on each inner surface of both side plates of the reflection frame plate,
A pair of mounting ears arranged longitudinally in the longitudinal direction and a pair of connecting ears arranged longitudinally in the longitudinal direction on the inner surface of the long horizontal plate of the lamp cover, respectively. The indirect illuminator according to claim 1, wherein the lamp cover is rotatably attached via a connecting pin and is rotatably attached. 3. The lamp cover has a length of an inner plate portion including the side plate and a horizontal plate portion inside the position of the connecting ear connected to the connecting pin, and an outer plate portion of the horizontal plate outside the position. The indirect illuminator according to claim 1 or 2, wherein the indirect illuminator is formed to have a length longer than the length. 4. A long cover plate portion projecting outward of both side plates of the reflection frame plate is provided on an outer edge of the long horizontal plate of the lamp cover arranged on the left and right sides of the reflection frame plate. The indirect illuminator according to claim 2 or 3, wherein the indirect illuminator is extended. 5. A mounting frame plate having a U-shaped cross section and having a stabilizer connected to the power source on the inner surface is provided on the ceiling plate therebelow by a hanging rod that hangs from the fixing base surface behind the ceiling. Suspended so as to cover the upper surface of the long cutout hole, insert the indirect illuminator according to claim 1, 2, 3 or 4 into the internal space of the U-shaped frame plate, and fix it with a fixture. An indirect illuminating device in which both side plates of the reflection frame plate and both side plates of the U-shaped frame plate are sandwiched and fixed, and each ballast and each socket on both sides are connected by a connecting wire. 6. A plate spacer is interposed between each plate of both side plates of the mounting frame plate and each plate of both side plates of the reflection frame plate of the indirect illuminator to polymerize the plate spacers. The indirect illumination according to claim 5, wherein a lead wire is inserted into a space formed vertically between the lead wires, and a lead-out end of the lead wire is cut across a lower end of a side plate of the reflection frame plate and connected to a terminal portion provided on a socket. apparatus.