JP2013178988A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of reducing glare generated when it is installed in an inclined ceiling.SOLUTION: A lighting fixture includes a light source part 2 having an LED chip 20 as a light source, a fixture body 1 which houses the light source part 2 inside with the lower side open, a reflector 4 which reflects light from the light source part 2, a swinging mechanism which consists of a holding part 5 for holding the reflector 4 rotatably and a support table 6, and a tubular frame 7 which is installed in the fixture body 1 and has an incident port 70A where light from the light source part 2 or reflection light from the reflector 4 enters, and an emission port 70B from where light entered from the incident port 70A is emitted to the outside. A light diffusing surface for diffusing light is formed on the inner circumferential surface of a base part 70 of the frame 7 by applying a paint containing a light diffusion substance.

Description

  The present invention relates to a lighting apparatus used for a downlight that is embedded in a ceiling surface of a house or the like and illuminates a corridor, a wall, or the like.

  Usually, in a lighting fixture used for a downlight, it is necessary to consider the heat generation temperature of an LED even when a light emitting diode (hereinafter referred to as “LED”) is applied as a light source. In such a background, when a lens holder or a mechanism for changing the optical axis is interposed in the heat conduction path from the LED to the instrument body containing the LED, the LED does not sufficiently radiate heat. There is a risk of high temperatures. For example, Patent Document 1 discloses a lighting fixture that can perform good heat dissipation of the LED and can change the optical axis.

  The lighting fixture includes a fixture main body having heat conductivity and an irradiation opening formed on one end side, and an LED block fixed to the fixture main body so that the light emitting portion is positioned on the irradiation opening side of the fixture main body. In addition, this lighting fixture is a lens holder that is held in the fixture body by holding the condenser lens movably while keeping the distance between the LED block and the condenser lens on which the light from the light emitting part of the LED block is incident. With. Thereby, the mechanism for changing the lens holder and the optical axis is not interposed in the heat conduction path from the LED to the instrument body, and is thermally shielded from them.

  Therefore, do not increase the volume of the instrument body or lens holder, provide a gap in the instrument body, dissipate heat to the installed ceiling, set the LED output low, or cover the instrument body with insulation. Thus, good heat dissipation of the LED can be performed without doing so.

JP 2011-0065780 A

  By the way, although the ceiling on which the conventional lighting apparatus is installed is usually horizontal, there is a case where an inclined ceiling is provided for the purpose of restricting the building or effectively using the space. When the conventional lighting fixture is installed on the inclined ceiling, the irradiation opening of the fixture main body is inclined with respect to the floor surface. In the above-described conventional lighting fixture, since the condenser lens is movable, even when installed on an inclined ceiling, it is possible to illuminate directly below the installation location.

  However, when the conventional lighting apparatus is installed on an inclined ceiling, unexpected glare may occur. That is, when the conventional lighting fixture is installed on an inclined ceiling, the fixture main body is inclined with respect to a horizontal plane as compared with the case where the conventional lighting fixture is installed on a horizontal ceiling. For this reason, a part of the light from the light emitting part of the LED block is reflected by the inner surface of the fixture body, and this reflected light is emitted from the irradiation opening, which may cause glare.

  This invention is made | formed in view of said point, and it aims at providing the lighting fixture which can reduce the glare which arises when installing in an inclined ceiling.

  The luminaire of the present invention includes a light source unit using a light emitting diode as a light source, a fixture main body that opens one surface and accommodates the light source unit therein, a reflector that reflects light from the light source unit, and the reflector A tube having a swinging mechanism that holds the light pivotably, an incident port that is attached to the instrument main body and receives light from the light source unit, and an emission port that emits light incident from the incident port outward. And a light diffusion surface for diffusing light is formed on the inner peripheral surface of the frame.

  In this lighting apparatus, it is preferable that an optical member for diffusing or condensing transmitted light is provided between the light source and the reflecting plate.

  In the present invention, a light diffusion surface for diffusing light is formed on the inner peripheral surface of the frame. For this reason, when a part of light from a light source part reflects on the internal peripheral surface of a frame, it diffuses. Therefore, the present invention has the effect of reducing the glare that occurs when installed on an inclined ceiling.

It is a disassembled perspective view which shows Embodiment 1 of the lighting fixture which concerns on this invention. It is a disassembled perspective view which shows the light source part and lens of a lighting fixture same as the above. It is the top view which looked at the same lighting fixture from the top. (A), (b) is sectional drawing of a lighting fixture same as the above, respectively. (A), (b) is sectional drawing at the time of installing the same lighting fixture on a horizontal ceiling, respectively. It is sectional drawing at the time of installing the lighting fixture same as the above in an inclined ceiling. It is a figure which shows Embodiment 2 of the lighting fixture which concerns on this invention, (a)-(c) is sectional drawing at the time of installing the lighting fixture same as the above in the inclination ceiling from which an inclination angle differs, respectively.

(Embodiment 1)
Hereinafter, Embodiment 1 of the lighting fixture which concerns on this invention is demonstrated using drawing. In the following description, the vertical direction in FIG. 1 is defined as the vertical direction. The present embodiment is embedded in a ceiling, and as shown in FIG. 1, as shown in FIG. 1, an instrument main body 1, a light source unit 2, a lens 3, a reflector 4, a holding unit 5, and a support base. 6 and a frame body 7.

  The instrument body 1 is made of a metal material having thermal conductivity such as aluminum. As shown in FIGS. 1 and 4 (a), the instrument body 1 is formed in a bottomed cylindrical shape having an open bottom surface. The instrument main body 1 houses therein a light source unit 2, a lens 3, a reflecting plate 4, a holding unit 5, and a support base 6 which will be described later. As shown in FIG. 3, a pair of semicircular projections 10 in a plan view projecting radially outward are integrally formed on the outer peripheral surface of the lower end portion of the instrument body 1. Each protrusion 10 is provided with a mounting hole 10A having a circular shape in plan view that penetrates in the thickness direction.

  As shown in FIG. 2, the light source unit 2 includes a rectangular plate-shaped LED chip 20 that emits blue light, a disk-shaped sealing member 21 that seals the LED chip 20 made of a light-transmitting resin material, and an LED. And a substrate 22 on which the chip 20 is mounted. A cover 23 that covers the LED chip 20 and the sealing member 21 is attached to the substrate 22. The cover 23 is made of a resin material and is formed in a flat bottomed cylindrical shape having an upper surface opened. The cover 23 is provided with an opening 23A having a circular shape in plan view that penetrates in the thickness direction. Light from the LED chip 20 passes through the opening 23A.

  The sealing member 21 is mixed with a yellow phosphor (not shown). This phosphor is excited by the blue light emitted from the LED chip 20 and emits yellow light that is complementary to the blue light. Therefore, the light source unit 2 emits white light through the opening 23 </ b> A of the cover 23. The light source unit 2 only needs to emit white light, and the configuration for emitting white light is not limited to the combination of the LED chip 20 emitting blue light and the yellow phosphor.

  The substrate 22 is formed in a rectangular plate shape from an insulating resin material. On the upper surface of the substrate 22, a rectangular plate-like insulating sheet 24 made of a material having high thermal conductivity is placed. Thereby, the heat generated by the LED chip 20 is released. As the insulating sheet 24, for example, Sircon (registered trademark) manufactured by Fuji Polymer Co., Ltd. can be used. Of course, another member having high thermal conductivity may be used as the insulating sheet 24 instead of the sircon.

  The lens 3 is made of a translucent material such as polycarbonate. As shown in FIG. 2, the lens 3 is formed by integrally forming a hemispherical lens body 30 and a flat bottomed cylindrical holder 31 having an upper surface opened. The light source unit 2 is arranged inside the holder 31 so that the LED chip 20 faces downward. And the white light which the light source part 2 emits is condensed so that it may pass along the vertical direction by passing the lens main body 30. FIG.

  The reflection plate 4 is made of a metal material having thermal conductivity such as aluminum. As shown in FIG. 1, the reflecting plate 4 protrudes radially outward from the peripheral edge of the cylindrical main body 40 extending in the radial direction from the upper side to the lower side, and from the peripheral edge of the lower end of the main body 40. And a flange 41 to be formed integrally. The inner peripheral surface of the main body 40 is a reflective surface that reflects light from the light source unit 2. Therefore, the light from the light source unit 2 is reflected by the inner peripheral surface of the reflecting plate 4 and condensed on an incident port 70A of the frame body 7 to be described later.

  As shown in FIG. 1, the holding portion 5 integrally forms a cylindrical tube portion 50 that is open on both upper and lower surfaces and an inner flange 51 that protrudes inward in the radial direction from the periphery of the lower end portion of the tube portion 50. It consists of A pair of circular insertion holes 50 </ b> A are provided in the upper end portion of the cylindrical portion 50 in a plan view. As shown in FIGS. 4A and 4B, the flange 41 of the reflecting plate 4 is placed on the inner flange 51. Then, by fixing the flange 41 to the inner flange 51, the holding unit 5 holds the reflecting plate 4 in a form in which it is housed.

  As shown in FIG. 1, the support base 6 has an annular base part 60 placed on the upper surface of a base part 70 of the frame body 7, which will be described later, and a pair of flat plate-like protrusions projecting upward from the inner periphery of the base part 60 The standing piece 61 is integrally formed. Each standing piece 61 is provided with an insertion hole 61 </ b> A at a position overlapping with each insertion hole 50 </ b> A of the holding portion 5.

  Hereinafter, a method for attaching the holding portion 5 to the support base 6 will be described. First, the holding part 5 is inserted between the standing pieces 61, and the insertion holes 50 </ b> A of the holding part 5 are overlapped with the insertion holes 61 </ b> A of the support base 6. Then, an assembly screw S1 is inserted into each of the insertion holes 50A and 61A, and screwed with a nut N1. Thereby, the support base 6 hold | maintains the holding | maintenance part 5 so that rotation is possible centering | focusing on the straight line which connects the axis | shaft of each assembly screw S1 (refer FIG. 5 (a), (b)). That is, the holding portion 5 and the support base 6 constitute a swing mechanism that holds the reflecting plate 4 in a rotatable manner.

  The frame 7 is made of a metal material having thermal conductivity such as aluminum. As shown in FIGS. 4A and 4B, the frame body 7 has a cylindrical base portion 70 whose upper and lower surfaces are open, and a flange portion projecting outward from the peripheral edge of the lower end portion of the base portion 70 in the circumferential direction. 71 is formed integrally. An opening having a circular shape in plan view at the top of the base 70 serves as an entrance 70 </ b> A through which light from the light source unit 2 enters. In addition, the circular opening in the plan view at the bottom of the base 70 serves as an exit port 70B that emits light incident from the entrance port 70A outward. The inner peripheral surface between the entrance 70 and the exit 70 in the base 70 is a curved surface that expands in the radial direction from the top to the bottom.

  The inner peripheral surface of the base 70 is painted white with a paint containing a light diffusing substance such as titanium oxide. Thus, a light diffusion surface that reflects and diffuses the light incident from the incident port 70 </ b> A is formed on the inner peripheral surface of the base portion 70. In addition, you may form a light-diffusion surface in the internal peripheral surface of the base 70, for example by roughening by roughing etc. instead of painting with a white paint.

  As shown in FIG. 1, a pair of frustoconical boss portions 72 protruding upward from the flange portion 71 are integrally formed on the outer peripheral wall of the base portion 70. Each boss portion 72 is provided with a circular mounting hole 72A into which a fixing screw (not shown) is inserted. On the inner peripheral surface of each mounting hole 72A, although not shown, a female screw portion to which a fixing screw is tightened is formed.

  Hereinafter, a method of attaching the instrument main body 1 to the frame body 7 will be described. First, the instrument main body 1 is placed on the upper surface of the base 70, and the mounting holes 10 </ b> A of the instrument main body 1 are overlapped with the mounting holes 72 </ b> A of the base 70. Then, fixing screws are inserted into the mounting holes 10A and 72A and tightened. Thereby, the instrument main body 1 can be mechanically and thermally coupled to the frame body 7.

  Further, as shown in FIGS. 1 and 3, three spring attachment portions 73 for inserting and fixing the attachment spring 8 are provided on the outer peripheral wall of the base portion 70 with a certain interval in the circumferential direction. . The attachment spring 8 is made of, for example, a rectangular plate-shaped stainless steel plate. The attachment spring 8 is formed by bending one end in the longitudinal direction into a V shape. The attachment spring 8 is fixed to the base portion 70 by inserting the one end portion into the spring attachment portion 73. A curved portion 8 </ b> A that curves downward is provided at the center of the attachment spring 8 in the longitudinal direction. Further, the attachment spring 8 is biased outward while being fixed to the spring attachment portion 73. For this reason, the attachment spring 8 can be freely bent between a position where it contacts the outer peripheral wall of the base portion 70 and a position away from the outer peripheral wall of the base portion 70.

  When the present embodiment is installed on the horizontal ceiling A1, as shown in FIG. 5A, first, the instrument main body 1 and the frame body with the mounting springs 8 in contact with the outer peripheral wall of the base portion 70. 7 is inserted into the embedding hole A2. And if the instrument main body 1 and the frame 7 are inserted until the collar part 71 of the frame 7 contacts the periphery of the embedding hole A2, each attachment spring 8 will return to the position away from the outer peripheral wall of the base 70. Accordingly, the horizontal ceiling A1 is sandwiched between the curved portion 8A of each attachment spring 8 and the flange portion 71 of the frame body 7, and the present embodiment is embedded in the horizontal ceiling A1. As shown in FIG. 6, when the present embodiment is installed in the embedding hole B2 of the inclined ceiling B1, the same procedure as described above may be taken.

  Although not shown, a lighting device that supplies lighting power to the LED chip 20 is also installed on the horizontal ceiling A1 or the inclined ceiling B1 together with the present embodiment. This lighting device may be provided integrally with the present embodiment. Of course, you may install a lighting device in another place, without installing in the horizontal ceiling A1 or the inclination ceiling B1.

  In the present embodiment, the orientation of the reflecting plate 4 can be changed by rotating the holding unit 5. Thereby, in this embodiment, the emission direction of the light from the light source part 2 can be changed. For example, when the present embodiment is installed on the horizontal ceiling A1, unless the holding unit 5 is rotated as shown in FIG. 5A, the light emission direction from the light source unit 2 is directly below the installation location. On the other hand, when the holding unit 5 is rotated as shown in FIG. 5B, the direction of the reflecting plate 4 is changed based on the rotation of the holding unit 5. Can be directed diagonally downward.

  Moreover, when this embodiment is installed in the inclined ceiling B1, the reflecting plate 4 can be turned vertically downward by rotating the holding | maintenance part 5 as shown in FIG. For this reason, in this embodiment, even when it installs in the inclination ceiling B1, the emission direction of the light from the light source part 2 can be turned right under the installation place.

  Here, when this embodiment is installed in the inclined ceiling B1, the instrument main body 1 and the frame 7 are inclined with respect to the horizontal plane. For this reason, a part of the light from the light source part 2 or a part of the light reflected by the reflecting plate 4 is reflected by the inner peripheral surface of the base part 70 of the frame body 7, and this reflected light is emitted from the emission port 70B. In the present embodiment, as described above, the light diffusing surface is formed by painting the inner peripheral surface of the base portion 70 with a paint containing a light diffusing substance. For this reason, the light reflected by the inner peripheral surface of the base 70 diffuses. Therefore, in this embodiment, the glare which arises when installing in the inclination ceiling B1 can be reduced.

  By the way, in this embodiment, although the lens 3 is provided as an optical member between the light source part 2 and the reflecting plate 4, another optical member may be provided instead of the lens 3. For example, a translucent panel formed of a translucent material such as polycarbonate may be provided instead of the lens 3 as an optical member. This translucent panel may simply transmit light from the light source unit 2 or may diffuse the transmitted light. Of course, the effect of reducing the above-described glare can be achieved without providing an optical member between the light source unit 2 and the reflection plate 4.

(Embodiment 2)
Hereinafter, Embodiment 2 of the lighting fixture which concerns on this invention is demonstrated using drawing. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the first embodiment, the light emitting direction from the light source unit 2 can be directed directly below the installation location by rotating the holding unit 5 and changing the direction of the reflecting plate 4, but the movable range is limited. There is. For this reason, when the inclination angle of the inclined ceiling B1 increases, the reflector 4 cannot be rotated in accordance with the inclination angle, and there is a possibility that light cannot be emitted directly below the installation location. Therefore, this embodiment is characterized in that the shape of the base portion 70 ′ of the frame body 7 ′ is changed based on the inclination angle of the inclined ceiling B1, as shown in FIGS. .

  The frame body 7 ′ of the present embodiment has the same structure as the frame body 7 except that the shape of the base portion 70 ′ is different from the shape of the base portion 70. The instrument body 1 ′ of the present embodiment has the same structure as the instrument body 1 except that the shape of the instrument body 1 ′ is different from that of the instrument body 1. Furthermore, the light source unit 2 ′ of the present embodiment is the same as the light source unit 2 in that it emits white light, although the shape is different from that of the light source unit 2 of the first embodiment, and thus description thereof is omitted here.

  As shown in FIG. 7B, the base portion 70 'is formed so that the light source portion 2 faces vertically downward when the present embodiment is installed on a horizontal ceiling B1 having an inclination angle of 20 degrees. That is, the base portion 70 ′ is formed such that the upper surface thereof is inclined by 20 degrees with respect to the horizontal plane. For this reason, when the instrument main body 1 'is mounted on the upper surface of the base 70', the instrument main body 1 'does not tilt in the same manner as the instrument main body 1 when installed on the horizontal ceiling A1. Therefore, since the light source part 2 faces vertically downward similarly to the case where the instrument body 1 is installed on the horizontal ceiling A1, it is not necessary to rotate the reflecting plate 4.

  As described above, in the present embodiment, the upper surface of the base portion 70 ′ of the frame body 7 ′ is inclined on the assumption that it is installed on the inclined ceiling B <b> 1 in advance. For this reason, even if the inclination angle of the inclined ceiling B1 increases, there is a margin until the reflection plate 4 reaches the limit of the movable range, and therefore the reflection plate 4 can be rotated in accordance with the inclination angle. Therefore, even if this embodiment is installed in the inclination ceiling B1 with a large inclination angle, the light emission direction from the light source unit 2 can be directed directly below the installation location.

  In the present embodiment, the base portion 70 ′ is formed so that the upper surface is inclined by 20 degrees with respect to the horizontal plane. However, the inclination angle of the upper surface may be appropriately changed based on the inclination angle of the inclined ceiling B <b> 1. In addition, although the lens 3 is not used in the present embodiment, an optical member such as the lens 3 may be provided between the light source unit 2 ′ and the reflection plate 4 as in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Instrument body 2 Light source part 3 Lens 4 Reflector 5 Holding part (swing mechanism)
6 Support stand (swing mechanism)
7 Frame

Claims (2)

  A light source section that uses a light emitting diode as a light source, an instrument body that opens one side and houses the light source section therein, a reflecting plate that reflects light from the light source section, and the reflecting plate are rotatably held. A swing mechanism, and a cylindrical frame having an incident port that is attached to the instrument main body and receives light from the light source unit, and an output port that emits light incident from the incident port outward. A light diffusing surface for diffusing light is formed on the inner peripheral surface of the frame body.   The lighting apparatus according to claim 1, wherein an optical member for diffusing or condensing transmitted light is provided between the light source and the reflecting plate.

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