JP3617255B2 - Lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illuminating device in which an opening window for emission of a reflector is covered with a translucent plate.
[0002]
[Prior art]
Conventionally, as a lighting device of this type, as shown in FIG. 8, a translucent plate 4 such as a glass plate is brought into contact with the periphery of an opening window 3 of a reflector 2 in which a lamp 1 is housed. Has been proposed that is pulled by a spring 5 so as to be in close contact with the reflector 2. A packing 6 is attached to the peripheral portion of the light transmitting plate 4, and the spring 5 is coupled to the packing 6 to prevent the light transmitting plate 4 from being damaged or cracked. However, this structure has a problem that the number of parts is complicated and the manufacturing cost is high.
[0003]
On the other hand, as shown in FIG. 9, a holding groove 7 is formed on the entire periphery of the opening window 3 of the reflector 2, and the peripheral portion of the translucent plate 4 is inserted into the holding groove 7. A structure in which the packing 6 is sandwiched across the entire surface between the peripheral portion of the optical plate 4 and the inner peripheral surface of the holding groove 7 is also considered. In this structure, an outer flange piece 2 a is formed in advance on the opening edge of the reflector 2, and a substantially U-shaped packing 6 is attached to the peripheral portion of the translucent plate 4 so as to be transparent on the outer flange piece 2 a. The holding groove 7 is formed by stacking the optical plates 4 and bending the outer flange piece 2a so as to have a U-shaped cross section to form a pressing piece 2b facing the outer flange piece 2a. Therefore, the packing 6 functions as a cushioning material at the time of bending.
[0004]
[Problems to be solved by the invention]
By the way, in the said structure, when the lamp | ramp 1 becomes high temperature, the packing 6 may be heated and a part of component may decompose | disassemble, and dirt may adhere to the reflector 2 and the translucent board 4, and output efficiency may be reduced. is there. Since the reflector 2 and the translucent plate 4 cannot be removed and the end portion of the reflector 2 near the lamp 1 is narrow, the attached dirt is removed even if the reflector 2 is removed from the lamp 1. Is difficult.
[0005]
This invention is made | formed in view of the said reason, The objective is to provide the illuminating device which prevented that dirt adheres to the inside of a reflector.
[0006]
[Means for Solving the Problems]
The invention of claim 1 includes a reflector in which a lamp is housed and an opening window for emission is formed, and a translucent plate that covers the opening window formed in the reflector, and an outer flange piece and By forming the holding piece facing the outer casing piece by bending, the holding groove into which the peripheral portion of the translucent plate is inserted around the entire periphery of the opening window is formed between the outer casing piece and the holding piece. In the translucent plate, the peripheral portion of the surface facing the lamp is brought into contact with one surface in the holding groove, and the packing is sandwiched between the other surface in the holding groove and the translucent plate. It is what. According to this configuration, since the packing is not arranged on the inner side of the reflector, it is not easily affected by the heat from the lamp, and even if a part of the packing component is decomposed by the heat of the lamp, the reflector and the transparent Dirt does not adhere to one surface of the reflector on the optical plate, and a decrease in emission efficiency can be prevented. In addition, as in the conventional configuration, when the holding groove is formed by bending the vicinity of the reflector opening window, the light transmitting plate may be damaged or the light transmitting plate may be cracked due to the packing functioning as a cushioning material. Can be prevented.
[0007]
According to a second aspect of the present invention, in the first aspect of the invention, the reflector is made of metal, and a conductive layer is formed over the entire surface of the light-transmitting plate facing the lamp so that the conductive layer is electrically connected to the reflector. Connected. According to this configuration, even when a large amount of electromagnetic waves are radiated from the lamp as in the case where the lamp is an electrodeless discharge lamp using high-frequency discharge, by surrounding the lamp with the reflector and the conductive layer, The amount of radiation to the outside can be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
In this embodiment, as shown in FIGS. 1 and 2, the lamp 1 is housed in a bowl-shaped reflector 2, and the opening window 3 formed in the reflector 2 is covered with a translucent plate 4 such as a glass plate. It is a thing. A holding groove 7 is formed on the periphery of the opening window 3 of the reflector 2, and the peripheral portion of the translucent plate 4 is inserted into the holding groove 7. Further, one surface of the light transmitting plate 4 on the lamp 1 side is in surface contact with the inner peripheral surface of the holding groove 7, and the other surface of the light transmitting plate 4 and the inner peripheral surface of the holding groove 7 are made of silicon rubber or the like. Packing 6 is attached. That is, in the conventional configuration, the packing 6 has a substantially U-shaped cross section, but in the present embodiment, the packing 6 having a substantially L-shaped cross section is used. With this packing 6, the translucent plate 4 is fixed at a fixed position without rattling with respect to the reflector 2.
[0009]
In order to attach the translucent plate 4 to the reflector 2, the outer casing piece 2 a is formed on the opening edge of the reflector 2 as in the conventional configuration, and the peripheral portion of the translucent plate 4 is overlapped with the outer casing piece 2 a. A packing 6 is attached to the peripheral portion of the translucent plate 4, and the outer flange piece 2a is bent so as to have a substantially U-shaped cross section to form a pressing piece 2b facing the outer flange piece 2a. A holding groove 7 is formed between the piece 2a and the holding piece 2b. Here, the translucent plate 4 is in contact with the outer flange piece 2a during the bending process, but since the packing 6 is interposed between the pressing piece 2b and the translucent board 4, the bending process is performed. It is possible to prevent the translucent plate 4 from being broken by the stress during the process, or from being scratched during the bending process. That is, the packing 6 functions as a cushioning material during bending.
[0010]
In the above configuration, since the packing 6 is not exposed in the space surrounded by the reflector 2 and the translucent plate 4 (that is, the space in which the lamp 1 is housed), the packing 6 is heated and decomposed by the heat generated by the lamp 1. Even if a component is generated, the decomposed component does not enter the space surrounded by the reflector 2 and the translucent plate 4, and dirt is attached to the reflector 2. It is possible to prevent the dirt from adhering to the opposite surface of the film. That is, the quantity of emitted light can be maintained simply by performing maintenance on the outside of the translucent plate 4.
[0011]
By the way, as shown in FIG. 3, the illuminating device A having the above-described configuration is coupled to a light source unit 10 including a lighting device for lighting the lamp 1 and a power supply device. Moreover, a lighting fixture can be comprised by couple | bonding the one end part of the longitudinal direction of the light guide 8 formed in the cylinder shape (cylindrical shape) with the illuminating device A. FIG. An end reflector 9 is disposed at the other end of the light guide 8 in the longitudinal direction. Thus, the illumination is performed by gradually leaking light through the peripheral wall while guiding the light introduced from the illumination device A to the light guide 8 in the longitudinal direction of the light guide 8.
[0012]
As shown in FIG. 4, the light guide 8 has a structure with a maximum of four layers, and the function of guiding light from the illumination device A and leaking light is realized by the prism sheet 11. The prism sheet 11 is formed of a transparent synthetic resin such as polycarbonate, and as shown in FIG. 5, the outer surface is uneven in the cross section orthogonal to the longitudinal direction, and the apex angle of the convex portion is It is set to 90 degrees. Moreover, the inner surface is formed smoothly. Therefore, a part of the light passes through the prism sheet 11 according to the incident angle of the light from the inner surface, and the remaining light is reflected by the prism sheet 11. The prism sheet 11 is usually formed in a cylindrical shape by rounding a flat plate.
[0013]
An extractor film 12 made of a white synthetic resin sheet is disposed inside the prism sheet 11 as necessary, and the light distribution is controlled according to the position where the extractor film 12 is provided. On the other hand, a reflector film 13 made of a white synthetic resin sheet is disposed on the outside of the prism sheet 11 as necessary, and light leakage from the prism sheet 11 is shielded at a portion where the reflector film 13 is provided. Further, the outer side of the prism sheet 11 is covered with the outer film 14 over the entire circumference. When the reflector film 13 is provided, the outer film 14 is disposed outside the reflector film 13. The outer film 14 is made of polycarbonate, and a cylindrical one is usually used, but a flat plate may be rounded to form a cylindrical shape. The outer film 14 is transparent or milky white and has a function of reinforcing the whole and maintaining strength. If a milky white one is used, it also has a function of diffusing light.
[0014]
The end reflector 9 is an aluminum molded product and is fitted to the end of the light guide 8. The surface facing the inside of the light guide 8 is a mirror surface, and has a function of reflecting light from the light guide 8.
Accordingly, a part of the light introduced from the illumination device A to the light guide 8 passes through the prism sheet 11 while being repeatedly reflected on the inner peripheral surface of the light guide (prism sheet 11) 1. In a portion where the extractor film 12 and the reflector film 13 are not provided, the light that has passed through the prism sheet 11 passes through the outer film 14 and is extracted to the outside. The light reaching the end reflector 9 is reflected by the end reflector 9 and returns to the light guide 8, and is finally taken out through the prism sheet 11 and the outer film 13. In this way, light can be extracted from the prism sheet 11 with substantially uniform brightness over substantially the entire length of the light guide 8.
[0015]
The light guide 8 is supported by the holding member 20 at an appropriate location and fixed to a construction surface such as a ceiling surface. As shown in FIG. 3, the holding member 20 hangs around a light fixture 8 and a metal fixture 21 fixed to a construction surface such as a ceiling surface, and both ends are coupled to the fixture 21. And the support 22.
The fixture 21 includes a raceway 23 that is fixed to a construction surface such as a ceiling surface, and a fixture 24 that is fixed at an appropriate position in the longitudinal direction of the raceway 23. A metal wire is used for the support 22. The support 22 is formed in a U shape curved along the outer shape of the light guide 8, and hook portions 22 a curved in a U shape on the side away from the light guide 8 are formed at both ends of the support 22. The part 22 a is locked to the fixture 24.
[0016]
When installing the light guide 8, the raceway 23 is fixed to a construction surface such as a ceiling surface, and the fixtures 24 are fixed to a plurality of locations in the longitudinal direction of the raceway 23. In addition, one hook portion 22 a of the support 22 is engaged with each fixture 24. When the light guide 8 is fitted into the support 22 in this state, the light guide 8 is temporarily held by the support 22. In this state, the position of the light guide 8 in the longitudinal direction can be adjusted. In a state where the light guide 8 is temporarily held by the support 22, the hook portion 22 a is engaged with the fixture 24 while each support 22 is bent in the diameter reducing direction.
[0017]
By coupling the light guide 8 to the lighting device A as described above, a lighting fixture that emits light along the light guide 8 is configured.
(Embodiment 2)
This embodiment is a configuration particularly suitable when the lamp 1 is an electrodeless discharge lamp. That is, an electrodeless discharge lamp does not have an electrode in a space in which a discharge gas is enclosed in a bulb, and generates an arc discharge by applying a high-frequency electromagnetic field to the discharge gas from outside the space in which the discharge gas is enclosed. Thus, as is apparent from the principle of operation, the structure is such that high frequencies are easily radiated to the outside. Therefore, in order to suppress high-frequency leakage to the outside, as shown in FIG. 6, in this embodiment, a conductive layer 15 is formed at least on the surface facing the lamp 1 in the translucent plate 4. As is apparent from the description of the first embodiment, since the peripheral portion of the light transmitting plate 4 facing the lamp 1 is in close contact with the outer casing piece 2a of the reflector 2, the conductive layer 15 extends over the entire surface. By forming the conductive layer 15, the conductive layer 15 comes into close contact with the reflector 2. Since the reflector 2 is made of aluminum or stainless steel and has electrical conductivity, the lamp 1 is eventually surrounded by a conductor over substantially the entire circumference. If the reflector 2 is grounded, the reflector 2 and the conductive tank 15 function as an electromagnetic shield, and leakage of high frequency generated from the lamp 1 to the outside can be greatly reduced.
[0018]
For example, a transparent conductive film such as ITO is desirable as the conductive layer 15 in terms of emission efficiency, but a mesh made of a metal plate can also provide an electromagnetic shielding effect. Other configurations and operations are the same as those of the first embodiment. The conductive layer 15 may be formed on both surfaces of the translucent plate 4.
As shown in FIG. 7, a wire mesh 16 may be attached to the reflector 2 in place of the translucent plate 4. If a metal mesh 16 having elasticity in the thickness direction is used, the circumference of the metal mesh 16 can be held in the holding groove 7 without rattling without using the packing 6. Further, since the wire mesh 16 functions in the same manner as the conductive layer 15, an electromagnetic shielding effect can be obtained. That is, since the packing 6 is not necessary and the conductive layer 15 is not required to be formed, cost reduction can be expected.
[0019]
【The invention's effect】
The invention of claim 1 includes a reflector in which a lamp is housed and an opening window for emission is formed, and a translucent plate that covers the opening window formed in the reflector, and an outer flange piece and By forming the holding piece facing the outer casing piece by bending, the holding groove into which the peripheral portion of the translucent plate is inserted around the entire periphery of the opening window is formed between the outer casing piece and the holding piece. In the translucent plate, the peripheral portion of the surface facing the lamp is brought into contact with one surface in the holding groove, and the packing is sandwiched between the other surface in the holding groove and the translucent plate. Since the packing is not arranged inside the reflector, it is not easily affected by the heat from the lamp, and even if some of the components of the packing are decomposed by the lamp heat, Prevent dirt from adhering to one side of the reflector on the plate and prevent a decrease in emission efficiency It has the advantage that it can be.
[0020]
As in the second aspect of the invention, the reflector is made of metal, and a conductive layer is formed over the entire surface of the light transmitting plate facing the lamp, and the conductive layer is electrically connected to the reflector. However, even when a large amount of electromagnetic waves are radiated from the lamp, such as when the lamp is an electrodeless discharge lamp using high-frequency discharge, by surrounding the lamp with a reflector and a conductive layer, There is an advantage that the amount of radiation can be reduced.
[Brief description of the drawings]
1A and 1B show a first embodiment, in which FIG. 1A is a cross-sectional view of an essential part, and FIG.
FIG. 2 is a perspective view of the same.
FIGS. 3A and 3B show a lighting apparatus using the same, wherein FIG. 3A is a side view and FIG. 3B is a cross-sectional view.
4 is a perspective view of a light guide used in the lighting apparatus shown in FIG. 3. FIG.
FIG. 5 is an operation explanatory view of a light guide used in the lighting apparatus shown in FIG. 3;
6 is a cross-sectional view of a main part showing Embodiment 2. FIG.
FIG. 7 is a cross-sectional view showing an application example.
FIG. 8 is a cross-sectional view showing a conventional example.
FIG. 9 is a cross-sectional view showing another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lamp 2 Reflector 3 Opening window 4 Translucent board 6 Packing 7 Holding groove 15 Conductive layer

Claims (2)

A reflector in which a lamp is housed and an opening window for emission is formed, and a translucent plate covering the opening window formed in the reflector, and an outer flange piece and a pressing member facing the outer flange piece on the periphery of the opening window By forming the piece by bending, a holding groove into which the peripheral portion of the translucent plate is inserted around the entire periphery of the opening window is formed between the outer flange piece and the pressing piece. The illumination plate is characterized in that a peripheral portion of the surface facing the lamp in the light plate is brought into contact with one surface in the holding groove, and a packing is sandwiched between the other surface in the holding groove and the translucent plate. apparatus. 2. The reflector according to claim 1, wherein the reflector is made of metal, and a conductive layer is formed over the entire surface of the translucent plate facing the lamp, and the conductive layer is electrically connected to the reflector. The lighting device described.

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