JP2013065410A - Led luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED luminaire capable of contacting a substrate of an LED module uniformly to a luminaire body.SOLUTION: The LED luminaire is provided with the luminaire body, an LED module, and a light reflector. The LED module has the substrate which has a rear face to be in contact with a light source installation surface of the luminaire body and a mounting surface, and a plurality of LED elements to be mounted on the mounting surface. The light reflector is superposed on the mounting surface of the substrate, and is screwed to the light source installation surface together with the substrate by common screws. The light reflector has a plurality of projection parts of cylindrical shape having a light guiding hole facing the LED elements. The plurality of projection parts are constituted of a first projection part which is in contact with the mounting surface and presses the substrate to the light source installation surface and a second projection part which has a shorter length of projection to the mounting surface side than the first projection part.

Description

  Embodiments described herein relate generally to an LED lighting apparatus using an LED (Light Emitting Diode) as a light source.

  LEDs have been widely used not only for industrial fields but also for general lighting because of their features such as long life, low power consumption, impact resistance, high-speed response, high-purity display color, and lightness and thinness. In addition to LED modules, LED lighting fixtures that include a reflector that controls light distribution are known.

JP 2010-262846 A

  Provided is an LED lighting apparatus capable of bringing a substrate of an LED module into uniform contact with a main body.

  The LED lighting apparatus of the embodiment includes a main body having a light source mounting surface, an LED module, and a reflector. The LED module includes a substrate having a back surface in contact with the light source mounting surface and a mounting surface opposite to the back surface, and a plurality of LED elements mounted on the mounting surface. The reflector is overlaid on the mounting surface of the substrate and is screwed to the light source mounting surface together with the substrate with a common screw. The reflector has a plurality of cylindrical protrusions having light guide holes that allow the LED elements to face. The plurality of protrusions are a first protrusion that contacts the mounting surface and presses the substrate against the light source mounting surface, and a protrusion length toward the mounting surface from the first protrusion. Has a short second protrusion.

  According to the present invention, high heat dissipation can be expected.

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 main body of the LED lighting fixture of embodiment. The perspective view by the side of the radiation fin in the 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 which illustrates the position of the external terminal of the LED element in the LED module. The top view of the reflecting plate in the LED lighting fixture of embodiment. (A) is an expanded sectional view of the 1st projection part in Drawing 7 (b), and (b) is an expanded sectional view of the 2nd projection part in Drawing 7 (b). 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 reflecting plate overlaid on the LED module of the 1st layout shown in FIG. 9, (b) is a top view of one LED module and the reflecting plate overlaid on it. The top view of the reflecting plate 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 a main body 2, an LED module 3 (shown in FIG. 4), a reflector 4 (shown in FIGS. 7A and 7B), a power supply unit 5, and a hanging angle. 6 (hereinafter also simply referred to as an angle).

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

  First, the main body 2 will be described.

FIG. 2 is a plan view of the main body 2 on the light source mounting surface 11 side.
FIG. 3 is a perspective view of the heat radiating fin 15 side opposite to the light source mounting surface 11 in the main body 2.

  The main 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 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 a plurality of heat radiating fins 15 are provided on the heat radiating surface 12. The plurality of heat radiating fins 15 project to the opposite side of the light source mounting surface 11 perpendicular to the heat radiating surface 12 (this direction is represented as the Z direction in FIG. 3).

  In FIG. 3, the XY plane orthogonal to the Z direction represents a plane parallel to the heat radiating surface 12. The X direction and the Y direction are orthogonal to each other. All the radiation fins 15 extend in the Y direction, which is the same direction.

  For example, the main body 2 is formed by die-casting aluminum or a metal containing aluminum as a main component, and the plate 13 and the heat radiating fins 15 are integrally provided. The entire surface of the main body 2 including the plate 13 and the heat radiating fins 15 is formed with an aluminum oxide film by, for example, alumite treatment in order to improve heat dissipation.

  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 an annular shape 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 for positioning the later-described reflector 4 in the second layout shown in FIG.

  For example, twelve protruding bosses 22 are provided in the vicinity of the outer peripheral edge of the light source mounting surface 11. 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 later-described reflector 4 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 for positioning the later-described reflector 4 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. The screw holes 24 and 25 are bottomed screw holes that do not penetrate the plate 13. The screw holes 24 are used to screw the six LED modules 3 and the six reflectors 4 to the light source mounting surface 11 in the first layout. The screw holes 25 are used to screw the four LED modules 3 and the four reflectors 4 to the light source mounting surface 11 in the second layout.

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 mounting surface of the substrate 31. A plurality (30 in the example shown in FIG. 4) of LED elements 32 are mounted on a single substrate 31. For example, the plurality of LED elements 32 are mounted in groups of three. Further, on the mounting surface of the substrate 31, one connector 33, one resistor R, and a plurality of capacitors (10 in the example shown in FIG. 4) are mounted.

  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 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-shaped planar shape in which a corner on the central angle side is cut. One notch 39 is formed at the end on the central angle side of the substrate 31, and two notches 35 are formed at the arc-shaped outer periphery.

  The mounting surface of the substrate 31 is covered with an insulating film such as a resin, for example, and a wiring pattern 36 shown in black in FIG. 5 is formed on the insulating film. The wiring pattern 36 is made of, for example, a copper material. 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.

  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 soldering, for example.

  FIG. 6 is a diagram in which the position (or solder position) of the external terminal 32 a of each LED element 32 is superimposed on the wiring pattern 36. 6 also shows the capacitor C, the resistor R, and the external terminals (or solders) 41, 42, and 43 of the connector 33, respectively.

  In the embodiment, a plurality of (for example, 30) LED elements 32 are connected in series via the wiring pattern 36. The plurality of LED elements 32 are connected to the connector 33 via the resistor R. Further, one capacitor C is connected in parallel for each group having three LED elements 32 as one unit.

  The LED element 32 is mounted on the mounting surface with the light emission surface facing away from the mounting surface of the substrate 31. The back surface opposite to the mounting surface of the substrate 31 is in contact with the light source mounting surface 11 of the main body 2.

  A pair of through holes 34 is formed in the substrate 31. The through holes 34 are aligned with a pair of screw holes 24 arranged in the radial direction of the light source mounting surface 11 shown in FIG. Alternatively, the through holes 34 are aligned with the pair of screw holes 25 arranged in the radial direction of the light source mounting surface 11 at positions different from the screw holes 24.

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

  FIG. 9 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, the LED module 3 is fastened to the light source mounting surface 11 together with the later-described reflector 4 by screws screwed into the screw holes 24 through the through holes 34.

  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. The notch 35 can be easily fitted into the boss 22 by sliding the substrate 31 on the light source mounting surface 11. 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. 10 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. The LED module 3 is fastened to the light source mounting surface 11 together with the later-described reflecting plate 4 by screws screwed into the screw holes 25 through the through holes 34.

  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 end on the central angle side 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. The notches 39 and 35 can be easily fitted into the bosses 21 and 23 by sliding the substrate 31 on the light source mounting surface 11. 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 surface direction of the light source attachment surface 11, and can be attached to and detached from the light source attachment 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 which is a first positioning portion for positioning the LED module 3 in the first layout shown in FIG. 9 and a second positioning portion for positioning the LED module 3 in the second layout shown in FIG. Both bosses 21 and 23 are provided on the light source mounting surface 11 of the same main body 2.

  Therefore, there is no need to separately prepare a main body having a light source mounting surface designed for the first layout and a main body having a light source mounting surface designed for the second layout. The main body 2 having the same design can be used for both the first layout and the second layout. Only one type of mold for the main body 2 is required, which does not increase costs.

  As shown in FIG. 9, 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. 10, 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 an illumination that does not give a sense of incongruity in which a circular or annular portion that is often seen in existing lighting fixtures can be seen.

  Further, in the second layout in which the four LED modules 3 are arranged, 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 six LED modules 3 are arranged. Yes.

  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. 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 surface 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 reflecting plate 4 will be described.

  FIG. 7A is a plan view of the front surface of the reflecting plate 4, and FIG. 7B is a plan view of the back surface of the reflecting plate 4.

  A plurality of protrusions including a first protrusion 81 and a second protrusion 82 having relatively different protrusion lengths are provided on the rear surface side of the reflection plate 4.

  FIG. 8A is a cross-sectional view of the first projecting portion 81, and FIG. 8B is a cross-sectional view of the second projecting portion 82.

  The first protrusion 81 has a longer protrusion length than the second protrusion 82. The front end surface 81a of the first protrusion 81 protrudes longer by, for example, 0.3 mm than the front end surface 82a of the second protrusion 82.

  Each of the first protrusion 81 and the second protrusion 82 is formed in a cylindrical shape having a light guide hole 80 penetrating the reflection plate 4 on the inside.

  As will be described later, the reflector 4 is superimposed on the LED module 3 with the LED element 32 of the LED module 3 facing the light guide hole 80.

  Further, as shown in the cross-sectional views of FIGS. 8A and 8B, the diameter of the light guide hole 80 increases from the back surface side to the front surface side of the reflecting plate 4. For example, the inner peripheral surface of the light guide hole 80 is formed as a surface in which tapered surfaces with different inclination angles are combined. Alternatively, the inner peripheral surface of the light guide hole 80 is not limited to a tapered surface, and may be a curved surface such as a parabolic surface, a combination thereof, or a combination of a surface perpendicular to the light source mounting surface 11 and a tapered surface. Good. Further, a lens may be fitted into the light guide hole 80. By designing the inner wall surface of the light guide hole 80 and using a lens, the light distribution angle of light can be controlled as desired.

  A step is provided between the inner peripheral surface of the first protrusion 81 and the front end surface 81a, and the end 81b of the inner peripheral surface following the step is closer to the central axis side of the light guide hole 80 than the front end surface 81a. And located above the tip surface 81a in the drawing.

  Similarly, a step is provided between the inner peripheral surface of the second protrusion 82 and the front end surface 82a, and the end 82b of the inner peripheral surface following the step is the center of the light guide hole 80 rather than the front end surface 82a. It is located on the shaft side and is located above the tip surface 82a in the drawing.

  The reflection plate 4 is a molded product of white resin having reflectivity with respect to light emitted from the LED element 32.

  A reflection film 88 is formed on the surface of the reflection plate 4 and the inner peripheral surface of the light guide hole 80. The reflective film 88 has reflectivity for the light emitted from the LED element 32. As the reflective film 88, 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 88.

  Two screw hole bosses 83 a and 83 b are formed on the back surface side of the reflector 4. The screw hole bosses 83 a and 83 b are formed in a cylindrical shape having a screw hole 85 penetrating the reflection plate 4 on the inside, and project to the back side of the reflection plate 4. The protruding lengths of the screw hole bosses 83 a and 83 b are shorter than the protruding length of the first protruding portion 81 and the protruding length of the second protruding portion 82.

  As will be described later, the screw hole 85 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 jointly fastened to the light source mounting surface 11 with a common screw. .

  The outer shape of the reflecting plate 4 is formed in a fan shape. The reflection plate 4 has a plurality of (for example, three in the embodiment) corners in the outer shape in plan view. In FIG. 7B, a straight line a connecting the corner portion on the central angle side of the sector and the arc-shaped outer peripheral portion, and dividing the sector central angle into two equal parts, is represented by a one-dot chain line.

  Two screw hole bosses 83a and 83b are located on the bisector a. A first protrusion 81 is provided between the two screw hole bosses 83a and 83b and at a substantially central position in the surface direction of the reflector 4. A plurality of protrusions are provided along the outer shape of the reflection plate 4 so as to surround the first protrusion 81 at the center. Of the plurality of protrusions on the outer peripheral side, the protrusion closest to each of the three corners is the first protrusion 81.

  The first projecting portion 81 that is closest to the corner portion on the central angle side of the sector is located on the bisector a. The other protrusions other than the two first protrusions 81 on the bisector a are positioned in a line-symmetric relationship with respect to the bisector a.

  Two further first protrusions 81 are provided symmetrically with respect to the bisector a with the screw hole boss 83a between the two first protrusions 81 on the bisector a interposed therebetween. ing. That is, the first protrusion 81 is provided at a total of six locations.

  In the embodiment, for example, ten protrusions are provided per one reflecting plate 4, six of which are first protrusions 81, and the remaining four protrude from the first protrusion 81. The second protrusion 82 has a short length.

  Three positioning bosses 84 a, 84 b, 84 c are further provided on the back surface side of the reflection plate 4. The positioning boss 84a is provided in the vicinity of the tip portion forming the sector-shaped central angle, and the other two positioning bosses 84b and 84c are provided in the vicinity of the arc-shaped outer peripheral portion. The positioning bosses 84 a, 84 b and 84 c are formed in a cylindrical shape, and the inner hole 86 has a bottom, and does not penetrate the surface side of the reflection plate 4. The protruding lengths of the positioning bosses 84a, 84b, 84c are shorter than the protruding length of the first protruding portion 81 and the protruding length of the second protruding portion 82.

  A plurality of ribs 87 are stretched around the back side of the reflecting plate 4. The protruding length of the rib 87 is shorter than the protruding length of the first protruding portion 81 and the protruding length of the second protruding portion 82.

  On the back side of the reflector 4, areas other than the first protrusion 81, the second protrusion 82, the screw hole bosses 83 a and 83 b, the positioning bosses 84 a, 84 b and 84 c, and the rib 87 are so-called hollowed recesses It has become.

  In the present embodiment, as described above, the plurality of LED modules 3 are mounted in a state of being divided in the surface direction of the light source mounting surface 11, but the reflector 4 is also divided in the surface direction of the light source mounting surface 11 in accordance with this. 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. 11A shows the layout of the reflector 4 in the first layout in which the six LED modules 3 shown in FIG. 9 are attached to the light source attachment surface 11. A reflector 4 is superimposed on each of the six LED modules 3.

  FIG. 11B shows an enlarged plan view of one reflecting plate 4 in a state of being superimposed on one LED module 3.

  The light guide hole 80 formed in the reflecting plate 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 80.

  As shown in FIGS. 8A and 8B, a reflective film 88 is formed on the inner peripheral surface of the light guide hole 80. A reflective film 88 is also formed on the surface of the reflective plate 4. The material of the reflecting plate 4 itself is a white resin having reflectivity with respect to the light emitted from the LED element 32. The light emitted from the LED element 32 is controlled by the reflecting plate 4.

  The screw holes 85 formed in the screw hole bosses 83 a and 83 b of each reflector 4 are aligned with the through holes 34 of the LED modules 3. And the through-hole 34 of each LED module 3 is aligned with the screw hole 24 shown in FIG.

  Then, the screw 70 shown in FIG. 11B is screwed into the screw hole 24 of the light source mounting surface 11 through the screw hole 85 of the reflection plate 4 and the through hole 34 of the LED module 3, so that the reflection plate 4 and the LED module 3. Is fixed to the light source mounting surface 11. That is, the LED module 3 and the reflection plate 4 are fastened and fixed to the light source mounting surface 11 with a common screw 70.

  When the reflecting plate 4 is superimposed on the substrate 31, the tip surface 81 a of the first protrusion 81 having a longer protrusion length toward the substrate 31 than the second protrusion 82 is surely in contact with the substrate 31. Then, by tightening the screw 70, the tip surface 81a of the first protrusion 81 presses the substrate 31 against the light source mounting surface 11 side.

  If the substrate 31 is directly fixed with a screw, an excessive force is locally applied to the substrate 31 and a crack may occur. However, in the embodiment, the head of the screw 70 is pressed against the peripheral surface of the screw hole 85 of the reflecting plate 4. The head of the screw 70 is not pressed against the substrate 31 in direct contact. Then, the substrate 31 is sandwiched between the reflecting plate 4 and the light source mounting surface 11. Therefore, the pressure contact force of the screw 70 is not directly applied to the substrate 31, and breakage such as cracks can be prevented.

  The back surface of the substrate 31 is in contact with the light source mounting surface 11. Heat accompanying the light emission of the LED is transmitted to the radiation fins 15 provided on the opposite side of the light source mounting surface 11 through the substrate 31 and the light source mounting surface 11, and is radiated to the space.

  In the structure in which the substrate 31 is pressed against the light source mounting surface 11 by the reflecting plate 4, a part of the back surface of the substrate 31 is separated from the light source mounting surface 11 depending on the dimensional tolerance of the reflecting plate 4 and the balance of the tightening force of the two screws 70. It may occur that the back surface of the substrate 31 does not contact the light source mounting surface 11 uniformly.

  When the back surface of the substrate 31 is not uniformly in contact with the light source mounting surface 11, the temperature varies among the plurality of LED elements 32 mounted on the substrate 31, and the luminous flux and color of the LED elements 32 may vary. There is.

  Even if all of the plurality of projecting portions serving also as light guides in the reflector 4 are designed to have the same projecting length, the substrate 31 may be deformed by heat from the LED module 3 side, dimensional variation, or dimensional tolerance during molding. Protrusions that do not hit can occur. In this case, it is not known which protrusions press against the substrate 31 and which protrusions do not hit the substrate 31 or the pressing force becomes weak. Therefore, the distribution of the pressing position from the reflecting plate 4 to the substrate 31 cannot be controlled, and in some cases, a part of the back surface of the substrate 31 may float from the light source mounting surface 11.

  Therefore, in the embodiment, a difference is made in the protruding lengths of the plurality of protruding portions protruding to the back surface side of the reflecting plate 4, and the pressing position from the reflecting plate 4 side to the substrate 31 is limited (control). doing.

  That is, the substrate 31 is fixed to only the first protrusion 81 among the plurality of protrusions also serving as the light guide. The first protrusion 81 having a protrusion length longer than that of the second protrusion 82 is reliably pressed against the substrate 31. By providing the first projecting portion 81 at an appropriate position, local lifting of the back surface of the substrate 31 can be suppressed, and the back surface of the substrate 31 can be uniformly brought into contact with the light source mounting surface 11.

  Thereby, the heat conductivity from the LED module 3 to the main body 2 increases, and high heat dissipation is obtained. The substrate 31 is a metal plate and has better heat conduction than a resin substrate or a ceramic substrate.

  The second protrusion 82 whose protrusion length toward the substrate 31 side is shorter than the first protrusion 81 does not contact the substrate 31. Alternatively, depending on how the screw 70 is tightened, the tip surface 82 a of the second protrusion 82 may come into contact with the substrate 31, but the substrate 31 is not strongly pressed against the light source mounting surface 11.

  In FIG. 4, the first projecting portion 81 is pressed to the position of the one-dot chain line circle 100. When the inner portion of the substrate 31 is pressed by the first projecting portion 81, the outer portion is likely to float with the fulcrum as a fulcrum. Therefore, as shown in FIG. 4, when the planar shape of the substrate 31 has a plurality of corners, pressing the vicinity of each corner easily makes the back surface of the substrate 31 uniformly contact the light source mounting surface 11. .

  Further, a strong pressing force is likely to be generated near the screwing portion due to the fastening force of the screw. Therefore, by providing the first projecting portion 81 between the two screwing portions, the first projecting portion between the two screwing portions is provided even if there is some dimensional variation in heat or molding. 81 is reliably pressed against the substrate 31. Further, in the embodiment, the position where the fan-shaped central angle side screwing portion is sandwiched in the circumferential direction is also pressed by the first protrusion 81.

  In the circular light source mounting surface 11, the heat exchange efficiency with the outside air is lower on the inner peripheral side than on the outer peripheral side, and the temperature tends to be relatively high. In the embodiment, the back side of the four groups of LED elements 32 on the inner peripheral side is strongly pressed against the light source mounting surface 11 by the first protrusion 81. For this reason, the heat dissipation from the board | substrate 31 to the main body 2 in an inner peripheral side can be improved.

  In the present embodiment, the first protrusion 81 surrounding the light guide hole 80 presses the substrate. Therefore, the back surface of the region surrounded by the one-dot chain line circle 100 in FIG. Therefore, the back surface of the LED element mounting portion that is likely to become the highest temperature can be brought into close contact with the light source mounting surface 11, and the heat dissipation efficiency is good.

  As shown in FIG. 8A, a step is provided between the inner peripheral surface of the first protrusion 81 and the front end surface 81a, and the end 81b on the substrate 31 side of the inner peripheral surface is in contact with the substrate 31. Instead, it floats from the substrate 31. Therefore, it is possible to reliably prevent the reflective film 88, which is a metal film formed on the inner peripheral surface, from contacting the wiring pattern 36 on the substrate 31, and to prevent a short circuit between the reflective film 88 and the wiring pattern 36.

  The LED lighting apparatus 1 is suspended from the ceiling or the like with the light source mounting surface 11 facing downward. A screw 70 that fastens the reflector 4 and the substrate 31 together with the light source mounting surface 11 passes through the reflector 4 and the substrate 31 and is screwed into the screw hole 24 or the screw hole 25 from the light source mounting surface 11 side.

  Moreover, the screw holes 24 and 25 formed in the light source mounting surface 11 are bottomed, and do not penetrate to the opposite side (the heat radiating surface 12 side) of the light source mounting surface 11. Therefore, it is excellent in waterproofing and dustproofing against the light source.

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

  The boss 22 provided on the outer peripheral side of the light source mounting surface 11 is fitted in the holes 86 of the two positioning bosses 84b and 84c shown in FIG. 7B formed near the arc-shaped outer peripheral portion of each reflector 4. . Thereby, positioning of the reflector 4 with respect to the light source attachment surface 11 becomes easy. Further, the reflecting plate 4 can be fitted to the LED module 3 from above and positioned. For this reason, the LED element 32 can be prevented from being rubbed or damaged by sliding the reflecting plate 4 with respect to the LED module 3.

  Next, FIG. 12 shows the layout of the reflector 4 in the second layout in which the four LED modules 3 shown in FIG. 10 are attached to the light source attachment surface 11.

  Each of the four reflectors 4 is overlaid on each of the four LED modules 3. The through hole 85 of each reflector 4 is aligned with the through hole 34 of each LED module 3. In the second layout, the through holes 34 and 85 are aligned with the screw holes 25 instead of the screw holes 24 used in the first layout.

  And the screw 70 shown in FIG.11 (b) is screwed in the screw hole 25 of the light source attachment surface 11 through the through-hole 85 of the reflecting plate 4, and the through-hole 34 of the LED module 3, and thereby the reflecting plate 4 and the LED module. 3 is fastened and fixed to the light source mounting surface 11 together.

  In the second layout shown in FIG. 12, 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, the boss 23 shown in FIG. 2 fits into one of the two positioning holes 86 formed on the outer peripheral portion of each reflector 4. Further, the boss 21 is fitted in the hole 86 provided on the central angle side of the reflecting plate 4. Thereby, positioning of the reflecting plate 4 with respect to the light source mounting surface 11 is facilitated also in the second layout.

  Also in the second layout, the reflecting plate 4 can be fitted and positioned with respect to the LED module 3 from above. For this reason, the LED element 32 can be prevented from being rubbed or damaged by sliding the reflecting plate 4 with respect to the LED module 3.

  The plurality of reflecting plates 4 are arranged in a state of being divided in the surface direction of the light source mounting surface 11 according to the LED module 3, and are attached to the light source mounting surface 11 for each reflecting plate 4 by attaching and detaching screws 70. It is detachable. 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, the luminous flux (brightness) and light distribution can be adjusted 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, the position in the circumferential direction on the light source mounting surface 11 in the first layout shown in FIG. 11A and the second layout shown in FIG. 12 according to the layout of the LED module 3. And the position in the radial direction (radial direction) is changed.

  In the second layout shown in FIG. 12, the reflecting plate 4 is closer to the center of the light source mounting surface 11 than in the first layout shown in FIG. 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 attachment surface 11 than in the first layout in which the reflectors 4 are densely arranged in the circumferential direction of the light source attachment surface 11. The plurality of reflectors 4 can be brought closer to the circumferential direction around the center. As a result, the distance in the circumferential direction between the light guide holes 80 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.

  In the first layout shown in FIG. 11A, the bosses 23 used in the second layout are located between the reflectors 4 adjacent in the circumferential direction, and the first layout of the reflectors 4 is used. Does not interfere with the placement.

  Conversely, in the second layout shown in FIG. 12, the bosses 22 used in the first layout are positioned on the outer peripheral side of the reflector 4 and do not hinder the arrangement of the reflector 4 in the second layout. .

  As shown in FIG. 3, on the heat radiating surface 12 side of the main body 2, a space recessed from the upper surface of the peripheral heat radiating fins 15 is formed along the diameter direction. On the space, the power supply unit 5 shown in FIG. 1 is provided.

  The LED lighting apparatus 1 is attached via an angle 6 to a ceiling or an elevating part suspended from the ceiling.

  As shown in FIG. 1, the angle 6 is provided integrally with the horizontal plate portion 61 facing the case top plate of the power supply unit 5 and both ends in the longitudinal direction of the horizontal plate portion 61, and from both ends of the horizontal plate portion 61. And a pair of vertical plate portions 62 extending downward. Then, the vertical plate portion 62 is screwed to a mounting portion 75 provided so as to protrude to the heat radiating surface side of the main body 2.

  For example, a lighting fixture attached to a high ceiling such as a gymnasium is large and heavy. Therefore, in order to directly attach such a lighting fixture to the ceiling, it is necessary to increase the thickness of the mounting portion in order to ensure the strength of the mounting portion on the lighting fixture side. This increases the weight of the entire lighting fixture. If it becomes heavy and heavy, construction becomes difficult.

  On the other hand, in the present embodiment, the main body 2 is secured to the ceiling or the elevating part and the like by attaching the angle 6 and suspending the main body 2 from the angle 6 to ensure the strength of the attaching part to the ceiling or the like. Can be made lighter. A plurality of mounting holes 61 a to 61 e are formed in the horizontal plate portion 61 of the arm 6, and can be applied to mounting modes such as two-point suspension or one-point suspension at different pitches.

  Depending on the planar size of the reflector 4 and the substrate 31, the screwing portion may be one place, or three or more places may be screwed. Further, where the screws are fixed depends on the layout of the plurality of LED elements 32 on the substrate 31.

  Regardless of the layout of the screwing portion and the LED element 32 on the substrate 31, at least the vicinity of the corner portion of the substrate 31 is pressed by the first protrusion 81 having a relatively long protrusion length of the reflector 4. If attached, the warping of the substrate 31 is suppressed, and the back surface of the substrate 31 is easily adhered to the light source mounting surface 11 uniformly.

  Further, in the case of a circular substrate, if the plurality of locations on the outer peripheral side are pressed by the first projecting portion, the warpage of the substrate is suppressed, and the back surface of the substrate can be easily adhered to the light source mounting surface.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example 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 ... Main body, 3 ... LED module, 4 ... Reflector plate, 5 ... Power supply unit, 6 ... Angle, 11 ... Light source mounting surface, 15 ... Radiation fin, 31 ... Substrate, 80 ... Light guide hole, 81 ... 1st protrusion part, 82 ... 2nd protrusion part, 88 ... Reflective film

Claims (5)

A main body having a light source mounting surface;
A substrate having a back surface in contact with the light source mounting surface and a mounting surface opposite to the back surface; and a plurality of LED (Light Emitting Diode) elements mounted on the mounting surface; an LED module;
A reflector that is superimposed on the mounting surface of the substrate and screwed to the light source mounting surface together with the substrate with a common screw;
With
The reflector has a plurality of cylindrical protrusions having a light guide hole that faces the LED element,
The plurality of protrusions are a first protrusion that contacts the mounting surface and presses the substrate against the light source mounting surface, and a protrusion length toward the mounting surface from the first protrusion. LED lighting fixture which has a 2nd short projection. The reflector has a plurality of corners in the outer shape in plan view,
The LED lighting apparatus according to claim 1, wherein a protrusion closest to each corner of the plurality of protrusions is the first protrusion. The reflector and the substrate are screwed to the light source mounting surface at a plurality of locations,
The LED lighting apparatus according to claim 2, wherein the first protrusion is provided between a plurality of screwing portions. The protrusion is
An inner peripheral surface facing the light guide hole and having a reflective film formed thereon;
A tip surface facing the substrate;
Have
The LED according to claim 1, wherein a step is provided between the inner peripheral surface and the tip surface, and an end of the inner peripheral surface following the step is floating with respect to the substrate. lighting equipment. The light source mounting surface has a bottomed screw hole,
5. The LED lighting apparatus according to claim 1, wherein the screw penetrates the reflection plate and the substrate and is screwed into the screw hole from the light source mounting surface side.

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