JP2013062154A - Led lighting fixture - Google Patents

Abstract

Provided is an LED lighting fixture in which an LED module can be easily attached and detached.
An LED lighting apparatus includes a fan-shaped substrate having an arc along a circumference of a light source mounting surface and a pair of adjacent bosses so that the arc can be attached to the arc of the substrate at equal intervals from the center of the arc. A pair of cutouts 35 that are longer than the cutout length near the arc end and are attached to the light source mounting surface 11 in a state of being divided in the diameter direction of the light source mounting surface 11. Each of the plurality of LED modules 3 and the light guide holes 45 that allow the LED elements 32 to face each other, and each of the plurality of reflectors 4 stacked on each of the plurality of LED modules 3 in a state of being divided in the diameter direction. And.
[Selection] Figure 10

Description

Embodiments of the present invention include LED (Light
The present invention relates to an LED lighting apparatus using Emitting Diode as a light source.

  LEDs are spreading not only in the industrial field but also for general lighting because of their long life and low power consumption. An LED lighting apparatus including a reflector that controls light distribution is used for general illumination (for example, Patent Document 1).

JP 2010-3679 A

  The present invention provides an LED lighting apparatus in which the number of LED modules can be easily changed.

  According to one aspect of the present invention, a circular light source mounting surface, an instrument body having a plurality of bosses provided at equal intervals in the vicinity of the periphery of the light source mounting surface, and an arc along the circumference of the light source mounting surface The fan-shaped substrate and the arc of the substrate that can be mounted on the adjacent pair of bosses are provided at equal intervals from the center of the arc, and the notch length near the center of the arc is longer than the notch length near the arc end A plurality of LED modules each having a pair of notches and an LED element mounted on a substrate, and being mounted on the light source mounting surface in a state of being divided in a diameter direction of the light source mounting surface; A plurality of reflectors, each having a light guide hole that faces each other, and being overlaid on each of the plurality of LED modules in a state of being divided in the diameter direction. Provided.

  According to the present invention, a highly versatile LED lighting apparatus is provided.

The external appearance perspective view of the LED lighting fixture of embodiment. The top view by the side of the light source attachment surface in the instrument main body of the LED lighting fixture of embodiment. The perspective view by the side of the heat sink in the instrument main body. The top view of the LED module in the LED lighting fixture of embodiment. The top view which illustrates the wiring pattern in the LED module. The top view of the reflector in the LED lighting fixture of embodiment. D-D 'sectional drawing in Fig.6 (a). The top view which shows the 1st layout of a some LED module. The top view which shows the 2nd layout of a some LED module. (A) is a top view of the reflector overlaid on the LED module of the 1st layout shown in FIG. 8, (b) is a top view of one LED module and the reflector overlaid on it. The top view of the reflector overlaid on the LED module of the 2nd layout shown in FIG.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element in each drawing.

Drawing 1 is an appearance perspective view of LED lighting fixture 1 of an embodiment.

The LED lighting apparatus 1 according to the embodiment includes an apparatus main body 2, an LED module 3 (shown in FIG. 4), a reflector 4 (shown in FIGS. 6A and 6B), a power supply unit 5, and an arm 6. And.

The LED lighting apparatus 1 according to the embodiment is a large-sized lighting apparatus whose power consumption is, for example, 100 W to 500 W. The LED lighting apparatus 1 is attached to, for example, a high ceiling such as a gymnasium or a lifting device suspended from the ceiling via an arm 6 that is an attachment member.

  First, the instrument body 2 will be described.

FIG. 2 is a plan view of the instrument main body 2 on the light source mounting surface 11 side.

FIG. 3 is a perspective view of the instrument main body 2 on the heat radiating surface 12 side.

The instrument body 2 has a circular plate 13. One surface side of the plate 13 is formed in a shallow dish shape, and a light source mounting surface 11 shown in FIG. 2 is formed on the bottom surface. At the outer peripheral edge of the light source mounting surface 11, an annular rim 14 is provided that protrudes from the light source mounting surface 11 toward the front side in FIG.

The other surface of the plate 13 functions as the heat radiating surface 12, and the heat radiating surface 12 is provided with a plurality of heat radiating fins 15 and 16.

The instrument main body 2 is formed by molding, for example, aluminum or a metal containing aluminum as a main component by a die casting method, and the plate 13 and the radiation fins 15 and 16 are integrally provided. Moreover, in order to improve heat dissipation, the oxide film of aluminum is formed in the whole surface of the instrument main body 2 including the plate 13 and the radiation fins 15 and 16 by an alumite process, for example.

A through hole 13 a is formed at the center of the plate 13. Therefore, as shown in FIG. 2, the light source mounting surface 11 is formed in a circle around the through hole 13a.

  For example, four projecting bosses 21 are provided around the through hole 13 a in the light source mounting surface 11. The four bosses 21 are arranged at intervals of, for example, 90 ° in the circumferential direction. The boss 21 functions as a second positioning portion that positions the reflector 4 described later in the second layout shown in FIG.

  In the light source mounting surface 11, for example, twelve protruding bosses 22 are provided near the inner peripheral wall of the rim 14. The twelve bosses 22 are arranged, for example, at 30 ° intervals in the circumferential direction. The boss 22 functions as a first positioning portion that positions the reflector 4 described later in the first layout shown in FIG.

Furthermore, for example, four projecting bosses 23 are provided on the light source mounting surface 11 on the inner circumferential side slightly from the bosses 22. In FIG. 2, the two left bosses 23 are arranged in the circumferential direction at intervals of 60 °, for example. In FIG. 2, the lower two bosses 23 are arranged in the circumferential direction at intervals of 120 °, for example. For example, the upper two bosses 23 in FIG. 2 are arranged at intervals of 120 ° in the circumferential direction. The boss 23 functions as a second positioning portion that positions the reflector 4 described later in the second layout shown in FIG.

In addition, a plurality of screw holes 24 and 25 are formed in the light source mounting surface 11. As shown in FIGS. 8 and 10, the screw holes 24 are used for screwing the six LED modules 3 and the reflectors 4 to the light source mounting surface 11, respectively. As shown in FIGS. 9 and 11, the screw holes 25 are used for screwing the four LED modules 3 and the reflectors 4 to the light source mounting surface 11, respectively.

  Next, the LED module 3 will be described.

  FIG. 4 is a plan view of the LED module 3.

  The LED module 3 includes a substrate 31 and LED elements 32 mounted on the substrate 31. On one substrate 31, a plurality (33 in the example shown in FIG. 4) of LED elements 32 are mounted. For example, the plurality of LED elements 32 are mounted in groups of three. A connector 33 is mounted on the substrate 31.

  It is preferable that the element substrate (or package substrate) of the LED element 32 and the substrate 31 of the LED module 3 have the same or close thermal expansion coefficient. For example, when the element substrate of the LED element 32 is a ceramic substrate, a ceramic substrate can be used as the substrate 31.

  Alternatively, a metal plate that is cheaper than a ceramic substrate may be used as the substrate 31. In the present embodiment, an iron substrate 31 having a smaller difference in thermal expansion coefficient with respect to the ceramic substrate than that of aluminum or copper is used. The substrate 31 has a substantially fan-like planar shape, and a notch 39 is formed at the front end portion on the center angle side, and a pair of notches 35 are formed on the arc-shaped outer peripheral portion.

Each of the pair of cutouts 35 has a cutout length (straight line portion) on the side of the counterpart (the other cutout 35) longer than the cutout length on the side opposite to the counterpart. In other words, the notch 35 is open toward the other side. As a result, the boss 22 is easily inserted into the notch 35, and after the insertion, the rotational direction around the boss 39 is restricted by the boss 35. Therefore, when the reflector 4 is mounted, the position of the substrate 31 is difficult to shift. Therefore, since the board 31 can be easily attached and detached, the layout can be easily changed by changing the number of boards 31 to be described later.

  The mounting surface of the substrate 31 is covered with, for example, an insulating film such as a resin, and a wiring pattern 36 indicated by hatching or gray in FIG. 5 is formed on the insulating film. In FIG. 5, the LED element 32 and the connector 33 mounted on the wiring pattern 36 are represented by a one-dot chain line. Further, for example, a white resin film having reflectivity with respect to the light emitted from the LED element 32 is formed on the outermost surface of the substrate 31 so as to cover the wiring pattern 36. This resin film has insulating properties and does not short-circuit between the wiring patterns 36 having different polarities.

  The wiring pattern 36 is made of, for example, a copper material. In FIG. 5, the insulation part between the wiring patterns 36 is shown in a white line shape. The wiring pattern 36 is formed in a solid pattern shape instead of a line shape, and is formed in an area wider than the insulating portion (white line-shaped portion) between the wiring patterns 36 in the surface of the substrate 31. Thereby, the heat dissipation of the heat | fever of the LED element 32 through the wiring pattern 36 can be improved.

  Each LED element 32 has an anode side external terminal and a cathode side external terminal, and these external terminals are joined to the wiring pattern 36 by, for example, solder. In the present embodiment, a plurality of (for example, 33) LED elements 32 and one connector 33 are electrically connected in series via a wiring pattern 36.

  The LED element 32 is mounted with the light emission surface facing the opposite side of the mounting surface of the substrate 31. The LED element 32 has a semiconductor chip including a light emitting layer and a phosphor layer containing phosphor particles. For example, when the phosphor particles are yellow phosphor particles that emit yellow light, the mixed color of blue light from the light emitting layer that is a GaN-based material and yellow light that is wavelength converted light in the phosphor layer is white or Light bulb color light is emitted to the outside. The phosphor layer may include a plurality of types of phosphor particles (for example, red phosphor particles that emit red light and green phosphor particles that emit green light).

  The LED module 3 is attached to the light source mounting surface 11 by bringing the surface (back surface) opposite to the mounting surface of the substrate 31 on which the LED element 32 is mounted into contact with the light source mounting surface 11 of the instrument body 2.

  A pair of through holes 34 is formed in the substrate 31. The through holes 34 described above with reference to FIG. 2 are a pair of screw holes 24 arranged in the radiation direction of the light source mounting surface 11, or a pair arranged in the radiation direction of the light source attachment surface 11 at a position different from the screw hole 24. Are aligned with any one of the screw holes 25. Then, when the screw is screwed into the screw hole 24 or 25 through the through hole 34, the LED module 3 is fixed in close contact with the light source mounting surface 11. Thereby, the heat conductivity from the LED module 3 to the instrument main body 2 increases. The substrate 31 of the LED module 3 is a metal plate and has better heat conduction than a resin substrate or a ceramic substrate.

  In the present embodiment, the number of LED modules 3 can be arbitrarily selected and attached to the light source attachment surface 11.

  FIG. 8 shows a first layout in which, for example, six LED modules 3 are attached to the light source attachment surface 11.

  The outer shape of the light source mounting surface 11 is circular. The six LED modules 3 are arranged at equal intervals along the circumferential direction around the center of the light source mounting surface 11.

  In the first layout, the through hole 34 of each LED module 3 is aligned with the screw hole 24 shown in FIG. 2 formed in the light source mounting surface 11. Then, a screw (not shown) is screwed into the screw hole 24 through the through hole 34, and the LED module 3 is fixed to the light source mounting surface 11.

  As shown in FIG. 4, two notches 35 are formed in the arc-shaped outer periphery of the substrate 31 of each LED module 3, and the bosses provided on the outer periphery side of the light source mounting surface 11 in each notch 35. The root part of 22 fits in. Thereby, positioning of the through hole 34 of the LED module 3 with respect to the screw hole 24 of the light source mounting surface 11 is facilitated.

  Next, FIG. 9 shows a second layout in which, for example, four LED modules 3 having a smaller number of LED modules 3 than the first layout are mounted on the light source mounting surface 11.

  The four LED modules 3 are arranged at equal intervals along the circumferential direction around the center of the light source mounting surface 11.

  In the second layout, the through hole 34 of each LED module 3 is aligned with a screw hole 25 different from the screw hole 24 used in the first layout. Then, a screw (not shown) is screwed into the screw hole 25 through the through hole 34, and the LED module 3 is fixed to the light source mounting surface 11.

  The base portion of the boss 21 provided around the center of the light source mounting surface 11 is fitted into the notch 39 (FIG. 4) formed at the tip of each LED module 3. Further, the base portion of the boss 23 provided on the inner peripheral side of the boss 22 used in the first layout in one of the two notches 35 formed in the arc-shaped outer peripheral portion of each LED module 3. Get stuck. Thereby, positioning of the through hole 34 of the LED module 3 with respect to the screw hole 25 of the light source mounting surface 11 is facilitated.

  The plurality of LED modules 3 are arranged in a state of being divided in the diameter direction of the light source mounting surface 11, and can be attached to and detached from the light source mounting surface 11 for each LED module 3 by attaching and detaching screws. Therefore, the number of LED modules 3 attached to the light source attachment surface 11 can be easily changed, and the luminous flux (brightness) can be adjusted according to the purpose of use of the LED lighting fixture 1.

  A boss 22 that is a first positioning portion for positioning the LED module 3 in the first layout shown in FIG. 8 and a second positioning portion for positioning the LED module 3 in the second layout shown in FIG. Both the bosses 21 and 23 are provided on the light source mounting surface 11 of the same instrument body 2.

  Therefore, it is not necessary to separately prepare an instrument body having a light source mounting surface designed for the first layout and an instrument body having a light source mounting surface designed for the second layout. The instrument body 2 having the same design can be used for both the first layout and the second layout. There is only one type of mold for the instrument body 2, which does not increase costs.

  As shown in FIG. 8, in the first layout, the boss 21 used in the second layout is located on the inner peripheral side of the LED module 3, and the boss 23 is located between the LED modules 3 adjacent in the circumferential direction. It does not disturb the arrangement of the six LED modules 3 in the first layout.

  Conversely, as shown in FIG. 9, in the second layout, the bosses 22 used in the first layout are located on the outer peripheral side with respect to the LED module 3, and the second layout of the four LED modules 3. Does not interfere with the placement.

  In the second layout in which the four LED modules 3 are arranged, not only the two LED modules 3 are simply removed from the first layout in which the six LED modules 3 are arranged. The direction position is shifted. That is, the circumferential positions of the LED modules 3 are shifted from the first layout in which the six LED modules 3 are arranged so that the four LED modules 3 are arranged at equal intervals in the circumferential direction.

  By arranging the plurality of LED modules 3 at equal intervals in the circumferential direction, the light emitting portions can be evenly distributed in the circumferential direction without unevenness. As a result, it is possible to realize illumination that does not cause a sense of incongruity in which a circular or circular portion that is often seen in existing lighting fixtures can be seen.

  In the second layout in which four LED modules 3 are arranged, six LED modules are used.

Each LED module 3 is brought closer to the center side of the light source mounting surface 11 than in the first layout in which the modules 3 are arranged.

  That is, the LED element 32 mounted on the LED module 3 approaches the center side of the light source mounting surface 11. Thereby, compared with the case where the position of the radial direction of the four LED modules 3 is made the same as the 1st layout shown in FIG. 11, the distance of the circumferential direction between the LED elements 32 between the LED modules 3 adjacent is made. It becomes small and it becomes easy to visually recognize the part to shine circularly or annularly.

  As described above, in the present embodiment, the light source mounting surface of each LED module 3 in the first layout in which the six LED modules 3 are arranged and the second layout in which the four LED modules 3 are arranged. 11 in the circumferential direction and the radial direction (radial direction).

  Thereby, the diameter direction distribution of the suitable light emission part according to the number (light beam) of the LED module 3 arrange | positioned at the light source attachment surface 11 is realizable.

  Further, the boss 22 used for positioning of the first layout is changed by changing the position in the circumferential direction and the position in the radial direction on the light source mounting surface 11 of each LED module 3 between the first layout and the second layout. And bosses 21 and 23 used for positioning in the second layout are provided on the same light source mounting surface 11, but the bosses 21 and 23 do not get in the way in the first layout, and the boss 22 in the second layout. It does not get in the way.

  Next, the reflector 4 will be described.

  FIG. 6A is a plan view of the front surface of the reflector 4, and FIG. 6B is a plan view of the back surface of the reflector 4.

  FIG. 7 is an enlarged cross-sectional view taken along the line D-D ′ in FIG.

  The outer shape of the reflector 4 is formed substantially the same as the outer shape of the substrate 31 of the LED module 3. The outer shape of the reflector 4 is formed in a substantially pentagonal shape surrounded by a pair of first side surface portions 41, a pair of second side surface portions 42, and an arcuate outer peripheral portion 43. Further, the planar size of the reflector 4 is substantially the same as the planar size of the substrate 31 of the LED module 3.

  The pair of first side surface portions 41 forms a first angle θ1. A corner portion formed by the pair of first side surface portions 41 is defined as a tip portion of the reflector 4. Its tip is rounded.

  1st angle (theta) 1 respond | corresponds to the angle of the central angle of the sector shape when a pair of 1st side part 41 is made into two sector-shaped radii. In the present embodiment, the first angle θ1 is approximately 90 °.

  A pair of second side surface portions 42 is provided between the pair of first side surface portions 41 and the arc-shaped outer peripheral portion 43. In a state where the reflector 4 is attached to the light source attachment surface 11 as shown in FIG. 13 or 14 described later, the second side surface portion 42 is away from the center of the light source attachment surface 11 from the first side surface portion 41. Extend to. The first side surface portion 41 and the second side surface portion 42 are connected via a bent or curved corner portion. The length of the second side surface portion 42 is longer than the length of the first side surface portion 41.

  The pair of second side surface portions 42 form a second angle θ2. The second angle θ <b> 2 corresponds to the angle of the central angle of the sector when the pair of second side surface portions 42 has two fan-shaped radii. In the present embodiment, the second angle θ2 is approximately 60 °.

  A plurality of light guide holes 45 are formed in the reflector 4. The light guide hole 45 passes through the reflector 4. Further, as shown in FIG. 6B, a recess 48 is formed near the tip on the back surface of the reflector 4.

  As will be described later, the reflector 4 is superimposed on the LED module 3 in a state where the LED element 32 of the LED module 3 is exposed from the light guide hole 45 and the connector 33 of the LED module 3 is housed in the recess 48.

  Further, as shown in the cross-sectional view of FIG. 7, the inner wall surface of the light guide hole 45 is a tapered surface having a hole diameter that increases from the rear surface side to the front surface side of the reflector 4. As will be described later, the inner wall surface of the light guide hole 45 is a taper in which the hole diameter increases as the reflector 4 is overlapped with the LED module 3 attached to the light source attachment surface 11 as the distance from the light source attachment surface 11 side increases. It is a surface.

  The inner wall surface of the light guide hole 45 is not limited to a tapered surface, but a curved surface such as a parabolic surface, a combination thereof, a combination of a surface perpendicular to the light source mounting surface 11 and a tapered surface, or a taper having a different inclination angle. A combination of surfaces may be used. A lens may be fitted into the light guide hole 45. By designing the inner wall surface of the light guide hole 45 and using a lens, the light distribution angle of light can be controlled as desired.

  The reflector 4 is a molded product of white resin having reflectivity with respect to light emitted from the LED element 32, and the first side surface portion 41, the second side surface portion 42, and the arc-shaped outer peripheral portion 43 are integrally provided. ing.

  In the reflector 4, a reflective film 48 (FIG. 7) is formed at least on the inner wall surface of the light guide hole 45. The reflective film 48 has reflectivity with respect to the light emitted from the LED element 32, and the inner wall surface of the light guide hole 45 functions as a reflective surface. As the reflective film 48, for example, an aluminum film formed by vapor deposition can be used. Alternatively, a metal film other than aluminum may be used as the reflective film 48.

  Further, two through holes 46 are formed in the reflector 4. The through hole 46 is aligned with the through hole 34 formed in the substrate 31 of the LED module 3 described above, and the substrate 31 and the reflector 4 are fastened to the light source mounting surface 11 with a common screw.

  In the present embodiment, as described above, the plurality of LED modules 3 are mounted in a state of being divided in the diameter direction of the light source mounting surface 11, but in accordance with this, the reflector 4 is also divided in the diameter direction of the light source mounting surface 11. In such a state, it can be laid out on the light source mounting surface 11.

  The plurality of LED modules 3 have the same structure including the outer shape and the outer size, and the plurality of reflectors 4 have the same structure including the outer shape and the outer size. The individual reflectors 4 are formed so as to approximate the individual LED modules 3 and the outer shape and size.

  FIG. 10A shows the layout of the reflector 4 in the first layout in which the six LED modules 3 shown in FIG. 8 are attached to the light source attachment surface 11.

  Each of the six reflectors 4 is overlaid on each of the six LED modules 3. The through hole 46 of each reflector 4 is aligned with the through hole 34 of each LED module 3. And the through-hole 34 of each LED module 3 is aligned with the screw hole 24 shown in FIG.

  Therefore, a screw (not shown) is screwed into the screw hole 24 through the through hole 46 of the reflector 4 and the through hole 34 of the LED module 3, so that the reflector 4 and the LED module 3 are fixed to the light source mounting surface 11. That is, the LED module 3 and the reflector 4 are fastened and fixed to the light source mounting surface 11 with a common screw.

  FIG. 10B shows an enlarged plan view of one reflector 4 in a state of being superimposed on one LED module 3.

  The light guide hole 45 formed in the reflector 4 is aligned with the position where the LED element 32 in the LED module 3 is mounted. For example, three LED elements 32 are exposed from one light guide hole 45.

  As described above, the reflection film 48 is formed on the inner wall surface of the light guide hole 45. In the reflector 4, a reflective film is also formed on the surface opposite to the light source mounting surface 11. The material of the reflector 4 itself is also a white resin having reflectivity with respect to the light emitted from the LED element 32. The light emitted from the LED elements 32 is controlled by the reflector 4.

  In the first layout shown in FIG. 10A, the six reflectors 4 are equidistant along the circumferential direction around the center of the light source mounting surface 11 according to the layout of the six LED modules 3. Are lined up.

  The bosses 22 provided on the outer peripheral side of the light source mounting surface 11 are fitted into the two notches 44 (FIGS. 6A and 6B) formed in the arc-shaped outer peripheral portion 43 of each reflector 4. Thereby, positioning of the reflector 4 with respect to the light source attachment surface 11 becomes easy.

  Next, FIG. 11 shows the layout of the reflector 4 in the second layout in which the four LED modules 3 shown in FIG. 9 are attached to the light source attachment surface 11.

  Each of the four reflectors 4 is superimposed on each of the four LED modules 3. The through hole 46 of each reflector 4 is aligned with the through hole 34 of each LED module 3. In the second layout, the through hole 34 of each LED module 3 is aligned with the screw hole 25 instead of the screw hole 24 used in the first layout.

  Then, a screw (not shown) is screwed into the screw hole 25 through the through hole 46 of the reflector 4 and the through hole 34 of the LED module 3, so that the reflector 4 and the LED module 3 are attached to the light source and attached to the light source attachment surface 11. Tightened and fixed.

  In the second layout shown in FIG. 11, the four reflectors 4 are arranged at equal intervals along the circumferential direction around the center of the light source mounting surface 11 according to the layout of the four LED modules 3. ing.

  In the second layout, one of the two notches 44 formed on the outer peripheral portion 43 of each reflector 4 is provided on the inner peripheral side with respect to the positioning boss 22 in the first layout. Boss 23 gets stuck. Thereby, the positioning of the reflector 4 with respect to the light source mounting surface 11 is facilitated also in the second layout.

  The plurality of reflectors 4 are arranged in a state of being divided in the diameter direction of the light source mounting surface 11 according to the LED module 3, and are attached to and detached from the light source mounting surface 11 for each reflector 4 by attaching and detaching screws. It is free. Therefore, it is possible to flexibly cope with a change in the number of LED modules 3 attached to the light source attachment surface 11 and a layout change.

  As a result, it is possible to adjust the luminous flux (brightness) and light distribution by changing the number and layout of the LED modules 3 and the reflectors 4 according to the purpose of use of the LED lighting apparatus 1, and the versatility is high. The LED lighting apparatus 1 can be provided.

  Also in the reflector 4, in accordance with the layout of the LED module 3, in the first layout shown in FIG. 13 and the second layout shown in FIG. 11, the circumferential position and the radial direction on the light source mounting surface 11. The position of (radiation direction) is changed.

  In the second layout shown in FIG. 11, the reflector 4 is closer to the center of the light source mounting surface 11 than in the first layout shown in FIG. 10. In order to make this possible, as described above with reference to FIG. 6A, a pair of first side surface portions 41 and a pair of side surfaces of each reflector 4 having a relatively large opening angle. The second side surface portion 42 is provided. That is, the first angle θ1 formed between the pair of first side surface portions 41 is larger than the second angle θ2 formed between the pair of second side surface portions 42.

  Therefore, the distance between the first side surfaces 41 between the reflectors 4 adjacent in the circumferential direction is larger than the distance between the second side surfaces 42 in the first layout shown in FIG. In the second layout, the distance is smaller than the distance between the second side surfaces 42.

  For this reason, in the second layout in which the number of reflectors 4 is reduced and closer to the center side of the light source mounting surface 11 than in the first layout in which the reflectors 4 are densely arranged in the circumferential direction of the light source mounting surface 11. The plurality of reflectors 4 can be brought closer in the circumferential direction around the center. As a result, the distance in the circumferential direction between the light guide holes 45 where the LED elements 32 face between the adjacent reflectors 4 becomes small, and it becomes easy to visually recognize the shining portion in a circular or annular shape.

  Further, in the first layout shown in FIG. 10, the bosses 23 used in the second layout are located between the reflectors 4 adjacent in the circumferential direction, and the arrangement of the reflectors 4 in the first layout is made. I do not disturb.

  Conversely, in the second layout shown in FIG. 11, the boss 22 used in the first layout is positioned on the outer peripheral side of the reflector 4 and does not hinder the arrangement of the reflector 4 in the second layout. . Further, the boss 21 provided near the center of the light source mounting surface 11 is hidden under the tip of the reflector 4 in the second layout.

  A transparent plate 26 represented by a two-dot chain line in FIG. 2 is attached to the fixture body 2 on the light source attachment surface 11 side. The transparent plate 26 is transmissive to the light emitted from the LED element 32, and for example, an acrylic plate can be used.

  The transparent plate 26 is screwed into a screw hole 14 a formed in a part of the rim 14 of the instrument body 2. A gap is formed between the transparent plate 26 and the surface of the reflector 4 attached to the light source attachment surface 11. For this reason, an air layer (heat insulation layer) is interposed between the light source side and the transparent plate 26, and heat from the light source side can be suppressed from being conducted to the transparent plate 26. As a result, expansion and contraction due to heat of the transparent plate 26 can be suppressed. Further, even if the transparent plate 26 is thermally expanded or contracted, the reflector 4 and the transparent plate 26 are not in contact with each other, and thus are not rubbed. For this reason, it is possible to avoid scratching the transparent plate 26 which is light and mechanically weak. Therefore, the light transmission is not hindered by the scratch.

  The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... LED lighting fixture, 2 ... Appliance main body, 3 ... LED module, 4 ... Reflector, 5 ... Power supply unit, 6 ... Arm, 11 ... Light source attachment surface, 12 ... Radiation surface, 15, 16 ... Radiation fin, 21- 23 ... boss, 24,25 ... screw hole, 31 ... substrate, 32 ... LED element, 35,44 ... notch

Claims (2)

An instrument body having a circular light source mounting surface and a plurality of bosses provided at equal intervals in the vicinity of the periphery of the light source mounting surface;
A fan-shaped substrate having an arc along the circumference of the light source mounting surface, and an arc of the substrate that can be mounted on the adjacent pair of bosses are provided at equal intervals from the center of the arc, and has a notch length near the center of the arc. Each has a pair of notches that are longer than the notch length near the arc end and the LED element mounted on the substrate, and is attached to the light source mounting surface in a state of being divided in the diameter direction of the light source mounting surface. A plurality of LED modules,
A plurality of reflectors each overlaid with each of the plurality of LED modules in a state of being divided in the diametrical direction, each having a light guide hole facing the LED element;
An LED lighting apparatus comprising:   The LED lighting apparatus according to claim 1, wherein the plurality of LED modules and the plurality of reflectors are arranged along a circumferential direction around a center of the light source mounting surface.

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