JP2016181435A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which enables improvement of heat radiation performance.SOLUTION: A lighting device 10 has: a light emitting part 12; a heat radiation body 11; and a wiring part 37. The heat radiation body 11 has: an arrangement part 24 in which the light emitting part 12 is arranged on a lower surface; an exposed surface part 29 provided on an upper surface of the arrangement part 24; and fins 21 which are provided around the exposed surface part 29 so as to protrude to the upper side relative to the exposed surface part 29. The wiring part 37 is provided at a position lower than the exposed surface part 29 of the heat radiation body 11.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a lighting device including a heat radiator that dissipates heat generated by a light emitting unit.

  2. Description of the Related Art Conventionally, an illuminating device including a light emitting unit using a light emitting element such as an LED includes a heat radiator to efficiently dissipate heat generated by the light emitting unit into the air.

  In many cases, the radiator has a light emitting portion disposed on the lower surface, a wall portion standing on the upper surface, and a plurality of fins integrated with the wall portion. In addition, a plurality of fins may be connected to each other.

  Moreover, a wiring part may be arrange | positioned in the upper part of a heat radiator. In this case, the wiring portion is provided by cutting out a partial region of the fin.

JP 2014-67505 A

  However, when the wiring portion is disposed on the heat sink, the wiring portion is disposed in the fin region, so that the air flow to the fin is hindered and the heat dissipation performance may not be sufficiently exhibited. .

  The problem to be solved by the present invention is to provide a lighting device capable of improving the heat dissipation performance.

  The illuminating device of embodiment has a light emission part, a heat radiator, and a wiring part. The radiator has an arrangement portion for disposing the light emitting portion on the lower surface, an exposed surface portion provided on the upper surface of the arrangement portion, and a plurality of fins provided around the exposed surface portion so as to protrude above the exposed surface portion. . The wiring portion is provided at a position lower than the exposed surface portion of the radiator.

  According to the present invention, it can be expected that the heat dissipation performance is improved.

It is sectional drawing of the illuminating device which shows one Embodiment. It is a top view of an illuminating device same as the above. It is a side view of an illuminating device same as the above. It is a perspective view of an illuminating device same as the above.

  Hereinafter, an embodiment will be described with reference to FIGS. 1 to 4.

  As shown in FIGS. 1 to 4, the lighting device 10 is a downlight and is installed in a buried hole provided in a ceiling member such as a ceiling board.

  The illuminating device 10 includes a radiator 11 as a fixture body, a light emitting unit 12 disposed on a lower surface that is one surface of the radiator 11, an optical unit 13 disposed in the radiator 11, and a lower portion of the radiator 11. A decorative frame 14 is provided, and a plurality of attachment springs 15 attached to the outer surface of the decorative frame 14 are provided.

  The radiator 11 is integrally formed of a metal material such as aluminum die casting that has excellent thermal conductivity and heat dissipation. The radiator 11 has a main body 20 and a plurality of fins 21 protruding from the outer surface of the main body 20.

  The main body portion 20 includes a disposing portion 24 on the lower surface on which the light emitting portion 12 is disposed, and a cylindrical tube portion 25 that is provided so as to open from the periphery of the disposing portion 24 downward. Yes. A housing part 26 for housing the light emitting part 12 and the optical unit 13 is formed below the arrangement part 24 and inside the cylinder part 25.

  The arrangement part 24 of the main body part 20 is formed in a flat plate shape, a light emitting part mounting surface 27 for arranging the light emitting part 12 is provided on the lower surface, and a columnar shape in the center of the upper surface opposite to the light emitting part mounting surface 27 The protruding portion 28 is integrally projected. The protruding portion 28 is disposed on the central axis 11a of the radiator 11, and a circular exposed surface portion 29 is provided on the upper surface of the protruding portion 28.

  The plurality of fins 21 are provided radially with respect to the central axis 11a of the radiator 11 from the periphery of the protrusion 28 to the periphery of the main body 20 (cylinder portion 25).

  The fins 21 protrude upward from the periphery of the exposed surface portion 29 above the exposed surface portion 29, and the fins 21 are spaced apart from each other.

  A central space portion 31 is formed in the inner region of the plurality of fins 21 in the upper region of the exposed surface portion 29, and inter-fin space portions 32 are formed between the plurality of fins 21, respectively, between the central space portion 31 and the plurality of fins. The space portion 32 communicates with each other in the upper region of the exposed surface portion 29.

  The fins 21 are linearly opposed to each other in the radial direction passing through the central axis 11a of the heat radiating body 11 so as to face the fin 21 on the opposite side via the central axis 11a of the heat radiating body 11. Accordingly, the inter-fin space portions 32 are also linearly opposed to each other in the radial direction passing through the central axis 11a of the radiator 11.

  An inclined portion 33 is formed on the inner edge of the fin 21 facing the upper region of the exposed surface portion 29 so as to expand (expand) from the periphery of the exposed surface portion 29 toward the outer diameter direction toward the upper end of the fin 21. Has been. An inclined portion 34 is also formed on the upper side of the outer edge of the fin 21 so as to reduce the diameter toward the upper end side of the fin 21.

  The fin 21 protrudes upward in the middle in the radial direction, and a cylindrical portion 35 for reinforcing the fin 21 is formed at that portion. The thickness of the fin 21 is formed so as to become thinner toward the upper side.

  A wiring portion 37 is provided at the position of one fin 21 by cutting out the fin 21. The wiring portion 37 is provided at a position lower than the exposed surface portion 29, and has a wiring frame 38 that protrudes to the side of the radiator 11. The wiring frame 38 has a lower frame portion 39 and side frame portions 40 on both sides, and the side frame portions 40 on both sides extend upward and are formed integrally with the adjacent fins 21.

  Bosses 41 and 42 for screwing are provided on the lower frame portion 39 and the arrangement portion 24, respectively. A cover 43 that covers the upper surface of the wiring portion 37 is disposed above the wiring portion 37, and the cover 43 is fixed to the bosses 41 and 42 with screws.

  Therefore, the wiring part 37 is provided at a position lower than the exposed surface part 29 in the space covered with the wiring frame 38 and the cover 43.

  A wiring passage 44 that communicates with the housing portion 26 is formed in the portion of the main body 20 that faces the wiring portion 37.

  Then, one end of the wiring for supplying power to the light emitting unit 12 is passed from the wiring unit 37 through the wiring passage 44 to the housing unit 26 and is electrically connected to the light emitting unit 12 in the housing unit 26. The other end of the wiring is electrically connected to a power supply device that converts AC power into predetermined DC power and supplies the light to the light emitting unit 12. In addition, a terminal block is installed in the wiring unit 37, and the light emitting unit 12 and the terminal block are electrically connected in the radiator 11, and the wiring from the power supply device is connected to the terminal block. Also good.

  The light emitting unit 12 uses a light emitting module 49 in which a plurality of light emitting elements 48 are mounted on a substrate 47. The light emitting module 49 is configured by a COB (Chip On Board) module in which LEDs, which are a plurality of light emitting elements 48 mounted on a substrate 47, are sealed with a phosphor layer 50.

  The optical unit 13 includes a cylindrical reflector 53 that expands downward, and a translucent cover 54 that closes the lower surface opening of the reflector 53. The reflector 53 and the translucent cover 54 are integrally held by an annular packing 55, and the packing 55 is disposed so as to be in close contact with the lower surface opening of the radiator 11.

  In addition, the decorative frame 14 is formed in a cylindrical shape, and an edge portion 58 that protrudes from the lower peripheral portion is in contact with the lower surface of the ceiling member to hold the ceiling member between the mounting spring 15 and covers the embedding hole. ing. A plurality of attachment spring mounting portions 59 are provided around the decorative frame 14. A reflecting mirror 60 is attached to the inside of the decorative frame 14.

  Further, for example, a leaf spring is used as the attachment spring 15, one end is attached to the attachment spring mounting portion 59 of the decorative frame 14, and the other end protrudes laterally from the decorative frame 14. And by elastically deforming each mounting spring 15 along the side face of the decorative frame 14 and the radiator 11 and inserting it from below into the embedding hole of the ceiling member, by the repulsive force against the elastic deformation of each mounting spring 15, Each mounting spring 15 expands to the side and abuts on the upper surface of the ceiling member, pulls up the decorative frame 14 and the radiator 11, etc., and between the edge 58 of the decorative frame 14 that abuts on the lower surface of the ceiling member Hold it in the state of being pinched.

  In the illuminating device 10 configured as described above, the light emitting unit 12 emits light by supplying power to the light emitting unit 12 from the power supply device. Light from the light emitting unit 12 is irradiated downward through the reflector 53, the translucent cover 54, and the reflecting mirror 60.

  Further, heat generated when the light emitting unit 12 emits light is transmitted to the disposing portion 24 of the heat dissipating body 11, and is transmitted from the disposing portion 24 to the entire heat dissipating body 11 to be radiated into the air.

  The heat transferred from the light emitting part 12 to the disposing part 24 is effectively transferred from the disposing part 24 to the protruding part 28 located above the light emitting part 12, and is radiated to the air from the exposed surface part 29 on the upper surface of the protruding part 28. At the same time, the heat is transferred from the peripheral surface of the projecting portion 28 to the plurality of fins 21 and radiated from the plurality of fins 21 to the air.

  Due to the convection of air generated when the temperature of the radiator 11 rises, an upward air flow is generated from the lower side of the inter-fin space portion 32 between the plurality of fins 21, and heat is radiated from the plurality of fins 21. .

  In the upper area of the exposed surface portion 29, there is no shielding, a central space portion 31 is formed, and the fin 21 protrudes above the exposed surface portion 29 from the periphery of the exposed surface portion 29. Since there is no place where the two are joined and the fins 21 are separated from each other, it becomes possible for air to flow so as to penetrate the radiator 11 in the radial direction, and the heat dissipation performance of the radiator 11 is improved. Can be improved.

  Moreover, since the inter-fin space portions 32 through which air flows are linearly opposed in the radial direction passing through the central axis 11a of the radiator 11, in the upper region of the exposed surface portion 29, as shown by arrows in FIG. Air can flow through the radiator 11 linearly in the radial direction, and the heat dissipation performance of the radiator 11 can be improved.

  Further, the inner edge of the fin 21 facing the upper area of the exposed surface portion 29 has an inclined portion 33 that expands (expands) in the outer diameter direction from the periphery of the exposed surface portion 29 to the upper end of the fin 21. Therefore, the air heated by the exposed surface portion 29 and the fin 21 can easily flow upward, and the heat of the air heated by the exposed surface portion 29 and rising is reduced from affecting the heat radiation of the fin 21. Therefore, the heat dissipation performance of the radiator 11 can be improved.

  In addition, the heat dissipating body 11 is provided with a wiring portion 37. Since the wiring portion 37 is provided at a position lower than the exposed surface portion 29, the flow of air flowing between the fins 21 in the upper region of the exposed surface portion 29. Thus, the heat radiation performance of the heat dissipating body 11 can be improved without interfering with the wiring portion 37.

  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.

10 Lighting equipment
11 Heat sink
12 Light emitter
21 fins
24 Placement section
29 Exposed surface
37 Wiring section

Claims (1)

A light emitting part;
A disposing portion for disposing the light emitting portion on a lower surface, an exposed surface portion provided on an upper surface of the disposing portion, and a plurality of fins provided around the exposed surface portion so as to protrude above the exposed surface portion. With a radiator;
A wiring portion provided at a position lower than the exposed surface portion of the radiator;
An illumination device comprising:

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