JP2008218238A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of improving the radiation properties of the heat generated from LEDs and a phosphor, and of improving light output. <P>SOLUTION: This luminaire A is provided with: a luminaire body 21; a board 2 with a plurality of LEDs 4 mounted thereon; a translucent panel 3 for transmitting light emitted from the LEDs 4; a fluorescent film 5 held to the translucent panel 3 and converting the color of the light emitted from the LEDs 4; and light guide plates 14 and 15, arranged on the luminaire body 21 and emitting a part of the light emitted from the LEDs 4 to the outside. The translucent panel 3 made of glass is arranged on the front side of the LEDs 4, being spaced apart from the LEDs 4 at a predetermined distance; a phosphor housing recessed part 3b is formed on the upper surface of the translucent panel 3; and the fluorescent film 5 is formed by applying a phosphor. In this luminaire A, a part of blue light emitted from the LEDs 4 is converted into yellow light by the fluorescent film 5, and white light obtained by mixing the blue light with the yellow light is emitted to the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting fixture using LEDs.

  Conventionally, there has been a lighting fixture using a white LED. In an LED used in this lighting fixture, a phosphor is held in a package that covers an LED chip, and light emitted from the LED chip is converted into white light by the phosphor and irradiated to the outside. In this luminaire, as the light output of the LED chip increases, the phosphor temperature rises due to the heat generated by the loss during color conversion in the phosphor, and the LED chip temperature also rises accordingly. In some cases, the output efficiency of the chip is lowered and sufficient light output cannot be obtained.

Therefore, in order to suppress the temperature rise of the LED chip, there has been proposed a lighting fixture in which a diffusion transmission plate is arranged in the light irradiation direction of the LED chip and a phosphor is applied to the inner side surface (see, for example, Patent Document 1). ). This luminaire has a plurality of LED chips each covered with a transparent electrical insulator, and a thin diffusive transmissive plate is provided between the LED chips in the light irradiation direction of these LED chips. Are arranged at intervals. In addition, a phosphor for color-converting light from the LED chip into light having a desired color temperature is applied to the surface of the diffuse transmission plate facing the LED chip. In this lighting fixture, even when the temperature of the phosphor rises due to heat generated during color conversion in the phosphor, the phosphor is disposed at a position away from the LED chip. Can be suppressed.
JP 2000-30521 (paragraphs [0015]-[0017], paragraphs [0026]-[0027] and FIG. 9)

  In the lighting apparatus shown in Patent Document 1 described above, the light emitted from the LED chip is simultaneously diffused when the color is converted by the phosphor, and further diffused by the diffusion transmission plate, so that it is diffused twice. In some cases, sufficient light output could not be obtained.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting apparatus that improves the heat dissipation of heat generated in the LED and the phosphor and improves the light output. It is in.

  The invention of claim 1 includes an LED, a panel made of a transparent material and disposed apart from the LED in the direction of light irradiation from the LED, an instrument body to which the LED and the panel are attached, and the panel. And a phosphor that converts at least a part of light emitted from the LED into light having a desired color temperature.

  The invention of claim 2 is characterized in that the transparent material is glass.

  The invention of claim 3 is characterized in that an uneven portion for polarizing light is provided on the surface of the panel opposite to the LED.

  The invention of claim 4 is characterized in that a polarizing sheet for polarizing light is provided on the surface of the panel opposite to the LED. Here, a polarizing sheet means what narrows the viewing angle of the light irradiated from LED.

  The invention according to claim 5 is characterized in that a light transmission part for emitting a part of the irradiation light of the LED to the outside is provided in a part other than the panel attachment part in the instrument main body.

  According to the invention of claim 1, by disposing the panel at a position separated from the LED and holding the phosphor on the panel, the temperature of the LED is increased due to heat generated by conversion loss in the phosphor. Since the heat generated by the conversion loss in the phosphor can be dissipated to the outside through the panel, it is possible to improve the heat dissipation and suppress the decrease in the output of the LED, and to provide a lighting fixture with improved light output There is an effect that can be done. In addition, since the light emitted from the LED can be diffused at the same time when the phosphor is color-converted, it is not necessary to provide a separate diffusing member and the light is not diffused twice, further increasing the output efficiency of the lighting fixture. There is an effect that it can be improved, and there is an effect that the instrument body can be downsized for a predetermined light output. Further, since the color temperature can be changed by replacing the panel, there is an effect that a desired color temperature can be easily obtained.

  According to the invention of claim 2, since the transparent material is glass, there is an effect that heat dissipation is improved as compared with the case where the transparent material is a resin.

  According to the invention of claim 3, by providing the uneven portion for polarizing the light on the surface of the panel, the viewing angle of the light emitted from the LED can be narrowed. Can be reduced, and glare can be prevented.

  According to the invention of claim 4, since the viewing angle of the light emitted from the LED can be narrowed by providing the polarizing sheet for polarizing the light on the surface of the panel, the luminance within the viewing angle that can be easily seen by humans. Can be reduced, and glare can be prevented.

  According to the invention of claim 5, by emitting a part of the light emitted from the LED as it is through the light transmission part, it is possible to irradiate the light that has not been color-converted, thereby improving the color rendering. There is an effect that can be done. In particular, when white light is obtained by a combination of an LED that emits blue light and a phosphor, the person in the space can be relaxed and cool by irradiating blue light as it is in addition to white light. Can be produced, and the lighting apparatus can be made smaller.

(First embodiment)
1st Embodiment is described based on FIGS. 1-4 and FIG. As illustrated in FIG. 1, the lighting fixture A of the present embodiment is disposed and attached to support members 17 and 17 fixed to, for example, a ceiling surface (not shown). In the following description, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG. 1, and the front of FIG.

  As shown in FIGS. 1 and 2, the lighting fixture A includes a fixture main body 21, a substrate 2 on which a plurality of LEDs 4 are mounted, a translucent panel 3 that transmits light emitted from the LEDs 4, and a translucent panel 3. A fluorescent film (phosphor) 5 for color-converting the light emitted from the LED 4 held by the LED 4 and a light guide plate (light transmission part) provided on the instrument main body 21 for emitting a part of the light emitted from the LED 4 to the outside. 14 and 15.

  First, the instrument body 21 will be described. The instrument main body 21 includes an upper main body 1, a frame 6, light guide plates 14 and 15, and an intermediate plate 16. The upper main body 1 has a horizontally long rectangular plate-shaped main body 1a, and the main body 1a. Is integrally provided with a projecting portion 1b projecting upward. A heat radiating portion 1e composed of a plurality of radiating fins projecting upward is integrally provided on the upper surface of the projecting portion 1b, and a substrate housing recess 1c for housing the substrate 2 is formed below the projecting portion 1b. . In addition, a plurality (six in FIG. 2) of insertion portions 1d for inserting attachment screws (not shown) around the opening of the substrate housing recess 1c are provided on the lower surface of the main body portion 1a at regular intervals. Projected.

  Here, the LED 4 will be described. This luminaire A is obtained by using, for example, an LED that emits light of a blue wavelength as the LED 4, converting a part of the blue light from the LED 4 to yellow light by the fluorescent film 5, and mixing the blue light and the yellow light. A plurality of LEDs 4 are mounted on the substrate 2 at a fixed mounting pitch. The substrate 2 is attached to a rectangular plate-like attachment plate 20 and is stored in the substrate storage recess 1 c of the instrument body 1. In addition, the board | substrate 2 is electrically connected to a commercial power source via the power wire (not shown) penetrated in the support tool 17, and supplies power to each LED4.

  Next, the frame body 6 will be described. The frame body 6 is formed in a horizontally long rectangular plate shape, and an opening 6a having an opening area substantially the same size as the substrate 2 is provided at the lower position of the substrate 2 at the center of the frame body 6. On the upper surface of the body 6, screw portions (not shown) to which mounting screws inserted into the respective insertion portions 1 d of the instrument body 1 are screwed are provided at portions corresponding to the respective insertion portions 1 d.

  Further, the light guide plates 14 and 15 will be described. The light guide plates 14 and 15 are made of, for example, acrylic resin and are formed in a horizontally long rectangular plate shape. The light guide plates 14 and 15 communicate with the opening 6a of the frame 6 at the center position of the light guide plate 14 and have an opening area larger than the opening 6a. A large opening 14a is provided. In addition, an opening 15a having a larger opening area than the opening 14a is provided at the center position of the light guide plate 15 so as to communicate with the opening 6a of the frame 6 and the opening 14a of the light guide plate 14. An opening 16 a having an opening area substantially the same as the opening 15 a of the light guide plate 15 is provided at the center position of the middle plate 16. Here, the light guide plate refers to a plate that uniformly emits light incident from the end face.

  Here, the translucent panel 3 is demonstrated based on FIG.2 and FIG.6. FIG. 6 is a detailed view of a main part of a second embodiment to be described later. In the present embodiment, the translucent panel 3 is the same, and will be described with reference to FIG. The translucent panel 3 has a horizontally long plate shape, and is formed of, for example, transparent glass. In addition, heat dissipation improves by forming the translucent panel 3 with glass compared with the case where it forms with resin. On the outer edge of the upper surface of the translucent panel 3, a protruding portion 3a protruding upward is integrally provided over the entire circumference, and a phosphor housing recess 3b is formed inside the protruding portion 3a. For example, a fluorescent film 5 is formed in the phosphor housing recess 3b by applying a phosphor that converts a part of blue light emitted from the LED 4 into yellow light. In the present embodiment, the fluorescent film 5 is formed by applying a fluorescent material. However, if the fluorescent film 5 is held by the translucent panel 3, the phosphor formed in a sheet shape is applied to the translucent panel 3. You may make it closely_contact | adhere. The translucent panel 3 is attached to the upper side surface of the frame body 6 by an appropriate method so as to close the opening 6 a of the frame body 6.

  Next, the procedure for assembling the lighting fixture A will be described. First, the mounting plate 20 to which the substrate 2 is attached is housed in the substrate housing recess 1c of the upper main body 1 with the LED 4 facing downward. Next, the light guide plate 14, the middle plate 16, the light guide plate 15, and the frame 6 to which the translucent panel 3 is attached are arranged in this order from above, and the mounting screw is inserted into the insertion portion 1 d of the upper main body 1. 6 is screwed together, the assembly of the lighting fixture A is completed. In this state, the translucent panel 3 is disposed at a position away from the LEDs 4 by substantially the same distance as the mounting pitch of the adjacent LEDs 4 mounted on the substrate 2. In addition, although it is desirable that the position of the translucent panel 3 with respect to the LED 4 is approximately the same distance as the mounting pitch of the adjacent LED 4, the light output of the LED 4 is increased by disposing the fluorescent film 5 at a position away from the LED 4. In addition, since the brightness unevenness on the panel surface can be suppressed by diffusing the light irradiated from the LED 4 with the fluorescent film 5, the distance between the LED 4 and the translucent panel 3 is smaller than the mounting pitch of the LED 4. The lighting fixture A can be made thinner.

  Next, operation | movement of the lighting fixture A is demonstrated. When the LED 4 is turned on, a part of the blue light emitted from the LED 4 toward the translucent panel 3 is converted into yellow light by the fluorescent film 5 and white light obtained by mixing with blue light. Is transmitted through the translucent panel 3 and irradiated downward. Further, the blue light traveling toward the light guide plates 14 and 15 is incident on the light guide plates 14 and 15 from the end surfaces of the openings 14a and 15a, and is repeatedly reflected to be uniformly blue light from the outer end surfaces of the light guide plates 14 and 15. Irradiated outside.

  In this luminaire A, the translucent panel 3 is disposed at a position away from the LED 4, and the fluorescent film 5 is formed on the translucent panel 3, whereby the LED 4 is heated by the conversion loss in the fluorescent film 5. Since the heat generated by the conversion loss in the fluorescent film 5 can be radiated to the outside through the translucent panel 3 without increasing the temperature, the heat dissipation can be improved and the decrease in the output of the LED 4 can be suppressed. A lighting fixture A with improved output can be provided. In addition, when a part of the light emitted from the LED 4 is converted into yellow light by the fluorescent film 5, the light can be diffused at the same time, so there is no need to provide a separate diffusing member and the light is not diffused twice. The output efficiency of the lighting fixture A can be further improved, and the fixture body can be downsized for a predetermined light output.

  Further, by emitting a part of the blue light emitted from the LED 4 to the outside as it is through the light guide plates 14 and 15, the blue light can be emitted and the color rendering can be improved. Moreover, by irradiating the blue light to the outside through the light guide plates 14 and 15, a person in the space can be relaxed, coolness can be produced, and the lighting fixture A can be made smaller.

  Next, another example of the present embodiment will be described with reference to FIG. In the luminaire A shown in FIG. 3, only the translucent panel 3 and the light guide plate 14 are disposed between the upper main body 1 and the frame body 6, and the frame body 6 is attached to the upper main body 1 using mounting screws 18. . In addition, a reflection plate 8 is provided between the substrate 2 and the light guide plate 14 in the vertical direction so as to project obliquely upward. The other configuration is the same as that of the lighting fixture A shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof is omitted.

  Here, operation | movement of this lighting fixture A is demonstrated. When the LED 4 is turned on, a part of the blue light emitted from the LED 4 directly toward the light transmissive panel 3 and the light reflected by the reflecting plate 8 and toward the light transmissive panel 3 is yellow light by the fluorescent film 5. The white light obtained by the color conversion and the color mixture with the blue light is transmitted through the translucent panel 3 and irradiated downward. Further, the blue light traveling toward the light guide plate 14 enters the light guide plate 14 from the end surface of the opening 14 a, and is repeatedly reflected, and is uniformly irradiated to the outside as the blue light from the outer end surface of the light guide plate 14.

  In this luminaire A, a reduction in output efficiency can be suppressed by providing the reflection plate 8 between the substrate 2 and the light guide plate 14 and increasing the amount of light directed to the translucent panel 3. Moreover, the thickness of the lighting fixture A can be made thin by using one light guide plate.

  Further, as shown in FIG. 4, an opening (light transmission part) is provided between the upper main body 1 and the frame 6 without using a light guide plate, and blue light is irradiated to the outside through the opening. Also good. This lighting fixture A is attached to the upper main body 1 with the frame body 6 spaced apart by the height of the insertion portion 1d, and an opening is formed over the entire circumference except for the insertion portion 1d. The other configuration is the same as that of the lighting fixture A shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof is omitted.

  In this lighting fixture A, since the blue light irradiated from LED4 can be irradiated outside through an opening part, blue light can be irradiated and color rendering property can be improved. In addition, you may provide a slit and a hole in the side surface of the upper main body 1, and may irradiate blue light outside.

  Moreover, an opening may be provided on the upper surface of the upper main body 1, and light reflected by the fluorescent film 5 is irradiated to the outside through the opening. The light leaking from above is light having a higher color temperature (closer to blue) than the light from the translucent panel 3.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. As shown in FIG. 5, the lighting fixture A of the present embodiment is embedded in an embedded hole 11 a provided in the ceiling material 11. The configuration other than the attachment of the instrument main body is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  The luminaire A includes a luminaire 21, a substrate 2 on which a plurality of LEDs 4 are mounted, a translucent panel 3 that transmits light emitted from the LEDs 4, and an LED 4 that is held by the translucent panel 3. And a fluorescent film 5 for color-converting the light irradiated from.

  First, the instrument body 21 will be described. The instrument main body 21 includes an upper main body 1 and a frame body 6, and the upper main body 1 is formed in a thin plate shape, and a plurality of heat dissipations for radiating heat generated by the LEDs 4 on the upper surface of the upper main body 1. Heat dissipating parts 9 and 9 made of fins are attached. Further, the substrate 2 is attached to the lower surface of the upper main body 1 while being held by the attachment plate 20. Further, L-shaped mounting brackets 7 are respectively attached to both ends of the upper main body 1 using mounting screws 19, and mounting springs 10 are respectively attached to the mounting brackets 7.

  Here, the LED 4 will be described. This luminaire A uses, for example, an LED that emits light of a blue wavelength as the LED 4, converts a part of the blue light from the LED 4 to yellow light with the fluorescent film 5, and mixes blue light and yellow light. The plurality of LEDs 4 are mounted on the substrate 2 at a fixed mounting pitch. The substrate 2 is attached to the lower surface of the upper main body 1 while being held by the attachment plate 20 so that the surface on which the LEDs 4 are mounted faces downward.

  Next, the frame body 6 will be described. The frame 6 is provided with an opening 6a having an opening area substantially the same size as the substrate 2 at a lower position of the substrate 2, and a flange 6b is integrally formed on the outer edge of the frame 6. To the upper body 1. In addition, a reflector 8 that is inclined obliquely upward is disposed between the frame 6 and the substrate 2 in the vertical direction. Here, the lighting fixture A is mounted on the ceiling surface by arranging the upper body 1 side on the back of the ceiling through the embedded hole 11a and sandwiching the ceiling material 11 between the flange portion 6b of the frame body 6 and each mounting spring 10. It is done.

  Next, the translucent panel 3 will be described with reference to FIG. The translucent panel 3 is made of, for example, transparent glass, and a projecting portion 3a projecting upward is integrally provided on the outer edge of the upper surface of the translucent panel 3 over the entire circumference. Is formed with a phosphor housing recess 3b. For example, a fluorescent film 5 is formed in the phosphor housing recess 3b by applying a phosphor that converts a part of blue light emitted from the LED 4 into yellow light. The translucent panel 3 is attached to the upper side surface of the frame body 6 by an appropriate method so as to close the opening 6 a of the frame body 6.

  Here, operation | movement of this lighting fixture A is demonstrated. When the LED 4 is turned on, a part of the blue light emitted from the LED 4 that goes directly to the light transmissive panel 3 and light that is reflected by the reflector 8 and goes to the light transmissive panel 3 is yellow light by the fluorescent film 5. The white light obtained by the color conversion and the color mixture with the blue light is transmitted through the translucent panel 3.

(Third embodiment)
A third embodiment will be described with reference to FIGS. 5 and 7 to 9. In the present embodiment, in the lighting fixture A of the second embodiment, the unevenness that polarizes white light transmitted through the translucent panel 3 in order to prevent glare by reducing the luminance within the viewing angle that is easily visible to humans. The part 3 c is provided on the lower surface (front surface) of the translucent panel 3. Other configurations are the same as those of the second embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  The translucent panel 3 is formed of, for example, transparent glass as shown in FIG. 7, and a protruding portion 3 a that protrudes upward is integrally provided over the entire circumference on the outer edge of the upper surface of the translucent panel 3. A phosphor housing recess 3b is formed inside the protrusion 3a. For example, a fluorescent film 5 is formed in the phosphor housing recess 3b by applying a phosphor that converts a part of blue light emitted from the LED 4 into yellow light. Further, an uneven portion 3c constituting a prism is formed on the entire lower surface (front surface) of the translucent panel 3, and the longitudinal direction of the instrument main body 21 (direction perpendicular to the paper surface) is normal by the uneven portion 3c. The viewing angle of the light transmitted through the translucent panel 3 and irradiated to the outside is narrowed in a plane as a direction. In addition to forming the translucent panel 3 with glass, the heat generated by the conversion loss in the fluorescent film 5 can be dissipated more efficiently by providing the uneven portion 3c on the surface.

  Here, operation | movement of this lighting fixture A is demonstrated. When the LED 4 is turned on, a part of the blue light emitted from the LED 4 that goes directly to the light transmissive panel 3 and light that is reflected by the reflector 8 and goes to the light transmissive panel 3 is yellow light by the fluorescent film 5. The color is converted into white light by mixing with blue light. Thereafter, when the white light reaches the surface of the translucent panel 3, light having a light shielding angle of a predetermined angle (for example, 30 °) or less is shielded by the uneven portion 3 c provided on the surface when the light passes through the translucent panel 3. The other light is irradiated downward. Accordingly, since the viewing angle of the light transmitted through the translucent panel 3 can be narrowed, the luminance within the viewing angle that can be easily seen by humans can be reduced, and one direction (for example, in FIG. 5) It is possible to prevent glare when the luminaire A is viewed from the left-right direction.

  Instead of providing the uneven portion 3 c on the lower surface (front surface) of the light transmitting panel 3, a polarizing sheet 12 that polarizes light may be provided on the lower surface of the light transmitting panel 3 as shown in FIG. 8. Also in this case, similarly to the luminaire A shown in FIG. 7, for example, the viewing angle of the light transmitted through the translucent panel 3 in a plane whose normal direction is the longitudinal direction of the polarizing sheet 12 can be narrowed. Therefore, it is possible to reduce the luminance within the viewing angle that can be easily seen by humans, and to prevent glare when viewing the luminaire A from one direction.

  Further, as shown in FIG. 9, the polarizing sheet 13 may be arranged so that the polarization axis is orthogonal to a plane whose normal direction is the longitudinal direction of the polarizing sheet 12. In this case, the polarizing sheet 12 can prevent glare in the left-right direction, and the polarizing sheet 13 can prevent glare in a plane whose normal direction is the short direction of the polarizing sheet 13. The glare when the lighting apparatus A is viewed from the top can be prevented.

  Further, the polarizing sheet 12 may be provided below the concavo-convex portion 3c shown in FIG. 7 so that the polarization axis is orthogonal to a plane in which the longitudinal direction of the instrument body 21 is a normal direction. It is possible to prevent glare when the luminaire A is viewed from the direction.

  In this embodiment, the case where the light blocking angle is 30 ° has been described as an example, but the light blocking angle is not limited to this embodiment. Therefore, by preparing multiple types of polarizing sheets 12 having different light blocking angles and replacing the polarizing sheets 12 according to the installation location, etc., it is possible to achieve light blocking suitable for the installation situation and reliably prevent glare. can do.

  The light transmitting panel 3 of the lighting fixture (hanging from the ceiling) A described in the first embodiment may be provided with uneven portions 3c for polarizing light and polarizing sheets 12 and 13, and second and third. The light guide plates 14, 15 and openings may be provided in the lighting fixture (ceiling embedded type) A described in the embodiment.

  By the way, in Embodiments 1 to 3 described above, white light is obtained by using a blue light emitting LED and mixed with light that has been converted to yellow light by a phosphor, but the method for obtaining white light is the present embodiment. The form is not limited, and a blue light emitting LED and a red / green phosphor may be combined to obtain white light by mixing blue light, red light and green light, or ultraviolet light emission. The LED and RGB phosphors may be combined to obtain white light. In the case of the combination of the blue light emitting LED and the phosphor, the blue light can be irradiated as it is, but the surface of the translucent panel 3 looks yellow when the LED is turned off. On the other hand, there is an advantage that there is no sense of incongruity because the combination of the ultraviolet light emitting LED and the phosphor is white.

  Furthermore, although each embodiment demonstrated the lighting fixture A which obtains white light as an example, it is not limited to what obtains white light, The light emission color and fluorescent substance of LED are suitably selected according to desired color temperature. It only has to be selected. Thus, it is possible to easily obtain a desired color temperature by preparing a plurality of types of translucent panels 3 using different phosphors and exchanging the translucent panels 3 according to applications.

  Furthermore, the material of the translucent panel 3 is not limited to glass, but may be any material that transmits light with a transparent material.

It is sectional drawing of the lighting fixture of 1st Embodiment. It is a disassembled perspective view of a lighting fixture same as the above. It is sectional drawing of the other lighting fixture same as the above. It is sectional drawing of another lighting fixture same as the above. It is sectional drawing of the lighting fixture of 2nd Embodiment. It is a principal part detailed drawing same as the above. It is a principal part detail drawing of the lighting fixture of 3rd Embodiment. It is a principal part detail drawing of the other lighting fixture same as the above. It is a principal part detail drawing of other lighting fixture same as the above.

Explanation of symbols

3 Translucent panel 4 LED
5 Fluorescent membrane (phosphor)
21 Appliance body A Lighting fixture

Claims (5)

  An LED, a panel made of a transparent material and disposed apart from the LED in the light irradiation direction of the LED, an instrument main body to which the LED and the panel are attached, and at least of the irradiation light of the LED held by the panel A luminaire comprising a phosphor that converts part of the light into light having a desired color temperature.   The lighting apparatus according to claim 1, wherein the transparent material is glass.   3. The lighting apparatus according to claim 1, wherein an uneven portion that polarizes light is provided on a surface of the panel opposite to the LED. 4.   The lighting fixture according to claim 1, wherein a polarizing sheet that polarizes light is provided on a surface of the panel opposite to the LED.   5. The light transmission portion for emitting a part of the irradiation light of the LED to the outside in a part other than the attachment part of the panel in the instrument main body. The lighting fixture as described in.

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