JP2010108858A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire with a LED light source with improved radiating effects without increasing its size. <P>SOLUTION: The luminaire comprises: a substrate 2 including a LED light source 3; a heat-conductive-metal lamp body 1 including a radiation fin 1a protruded on the back face side, an arm supporting portion 1b arranged at the approximate center of the back face while keeping the radiation fin off, and a storing recessed portion 1c storing the substrate 2 on the front face side in heat conductive relation; and a metal supporting arm 5 mounted at its front end on the arm supporting portion 1b of the lamp body in heat conductive relation for supporting the lamp body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire including an LED light source.

  In a luminaire equipped with an LED light source, it is indispensable to quickly dissipate the heat generated by the LED light source in order to keep the luminous efficiency of the LED light source high. Therefore, it is effective to form the lamp body using aluminum, which is a heat conductive metal, and to dispose heat radiation fins on the back side (see Non-Patent Document 1).

Toshiba Lighting & Technology Corporation Catalog A-47 (pages 16-18)

  However, if a sufficient heat radiation action is exhibited by the heat radiation fins, a large heat radiation fin is required, resulting in an increase in the size of the lighting fixture.

  An object of this invention is to provide the lighting fixture provided with the LED light source which improved the thermal radiation effect, without causing the enlargement of a lighting fixture.

  The luminaire of the present invention has heat radiation fins provided with a heat radiation fin on the back surface side, an arm support portion disposed around the heat radiation fin at a substantially central portion on the back surface, and a housing recess on the front surface side. A lamp body made of metal; an LED light source housed in a heat conducting relationship in a housing recess of the lamp body; and a metal support arm whose tip is attached to an arm support portion of the lamp body to support the lamp body; It is characterized by that.

  The present invention allows the following aspects.

  The lamp body is a central constituent member of the lighting fixture, which is also referred to as a lighting fixture main body, and is made of a heat conductive metal so that an LED light source described later easily dissipates heat generated when the lamp is turned on. Various known metals can be used as the thermally conductive metal, such as aluminum, copper, and brass.

  Further, the lamp body is provided with a radiation fin and an arm support part on the back side, and an accommodation recess on the front side. The radiating fins are allowed to have an appropriate shape, number and size.

  The arm support portion is disposed in a substantially central portion on the back surface of the lamp body so as to avoid the heat radiating fins, and forms a support arm support portion to be described later. In addition, the arm support part may attach the support arm to the lamp body in a movable relationship, or may attach it to the fixed relationship. In the case of a movable relationship, a stopper mechanism can be provided to regulate the movable range. The fact that the arm support portion is disposed avoiding the heat radiating fins means that the heat radiating fins do not hinder the attachment of the metal support arm to the arm support portion and the function of the support arm. For example, if the metal support arm is movable, part of the radiating fin located at the center of the back of the lamp body is cut out so as not to hinder its rotation, or the radiating fin is placed at the center of the back of the lamp body It can be prevented from forming.

  Further, when the arm support portion supports the metal support arm in a movable manner, the metal support arm may be fixed to a single axis and the lamp body may be adjustable in tilt angle. Thus, both the tilt angle and the horizontal angle may be adjustable.

  Further, the lamp body allows the thickness of the back surface to be relatively large at the central portion. In this aspect, since the arm support portion is disposed at substantially the center of the back surface of the lamp body, in other words, the thickness of the portion facing the arm support portion is large.

  The housing recess disposed on the front surface side of the lamp body opens to the front surface of the lamp body, and accommodates the LED light source in a heat conducting relationship. The heat conduction relationship means that the heat generated from the LED light source is accommodated so as to be easily conducted to the lamp body with or without the substrate, for example, the substrate is brought into close contact with the inner surface of the accommodating recess. Alternatively, the substrate can be accommodated in the accommodating recess via a thermally conductive mat made of silicone having good thermal conductivity, or a thermally conductive metal substrate can be interposed.

  Moreover, although the said accommodation recessed part accommodates at least LED light source, it can accommodate all or one part of light control members, such as a reflecting plate, a glareless cone, a prism cover, and a diffusion cover, if desired. Therefore, the depth which accept | permits accommodation of a light control member can be provided.

  The LED light source can be disposed on the lamp body via a substrate. That is, the LED light source is mounted on the substrate in advance, and the LED light source is supported on the substrate. When the LED light source is disposed on the lamp body, the LED light source can be disposed on the lamp body by attaching the substrate to the lamp body. Moreover, the board | substrate can be equipped with the wiring means for the power supply with respect to a LED light source. As wiring means, it is allowed to appropriately adopt various known means, but printed wiring is preferable.

  Moreover, the board | substrate provided with the LED light source can support the 1 or several LED light source with respect to the single-piece | unit. An appropriate number of LED light sources may be used according to the brightness to be set in the lighting fixture and the luminous flux value of the LED light source alone.

  Furthermore, it is allowed that the board | substrate provided with the LED light source mounts the lighting circuit of a LED light source. The lighting circuit may have an electronic circuit configuration or a simple circuit configuration having a DC power source and a current limiting resistor.

  However, if desired, the LED light source can be disposed on the lamp body without using a substrate.

  The metal support arm is a metal rod-like means for supporting the lamp body, and its tip is attached to the arm support section of the lamp body in a heat conducting relationship. In order to establish a heat conduction relationship, it is preferable to increase the contact area between the tip coupling portion of the metal support arm and the arm support portion, or to couple them via a heat-conductive washer. Further, the metal support arm may be hollow inside or non-empty. In the case of being hollow, an insulation coated conductor for supplying power to the LED light source can be inserted therein. Furthermore, the metal support arm may have a structure in which a base end thereof is fixed to a building such as a wall surface or a ceiling or furniture such as a desk, or a structure that is fixed to a base that can be moved on a tabletop or a floor, for example. There may be.

  Further, the metal support arm is preferably the heat conductive metal, but if the heat capacity is relatively large, even if it is made of metal such as stainless steel or iron, it may contribute as a heat dissipation means. .

  According to the present invention, the heat radiation fin is provided on the rear side of the lamp body, which is made of a heat-conducting metal and has a housing recess that houses the substrate in a heat conducting relationship on the front side, and heat is radiated in the substantially central portion of the rear side. By attaching the metal support arm to the arm support part that is arranged avoiding the fins, the metal support arm also contributes to the heat dissipation means, so the LED light source does not cause an increase in the size of the heat dissipation fins, etc. Therefore, it is possible to provide a lighting fixture that maintains a high luminous efficiency with good heat dissipation.

  Further, when the LED light source is housed in the housing recess, the generated heat accompanying the lighting of the lamp is concentrated in the center of the housing recess, so that the temperature distribution on the back surface of the lamp becomes higher in the center. By relatively increasing the wall thickness and attaching the support arm to the part, the heat of the central part generated by the LED light source can be dissipated more effectively via the arm support part. As a result, the temperature distribution on the back side of the lamp body is improved in a uniform direction, and the temperature distribution between the LED light sources is also improved accordingly, so that a decrease in light output is suppressed, and color unevenness and brightness unevenness occur. To reduce. In addition, since the arm support portion is disposed at a relatively thick portion on the back surface of the lamp body, the mechanical strength of the joint portion between the lamp body and the metal support arm is increased.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional front view showing a first mode for carrying out the lighting fixture of the present invention. In this embodiment, the lighting fixture includes a lamp body 1, a substrate 2, an LED light source 3, a reflector plate 4, a metal support arm 5, and an insulating coated conductor 6.

  The lamp body 1 is integrally formed by die-casting aluminum and includes a plurality of heat radiation fins 1a, arm support portions 1b, and housing recesses 1c. The plurality of heat radiating fins 1a are provided so as to protrude from the entire back surface of the lamp body 1 in parallel to each other at equal intervals. However, in the region where the arm support portion 1b is provided at the center of the back surface of the lamp body 1, a portion that becomes an obstacle in order to secure a space for disposing the arm support portion 1b has a structure in which no radiating fin is formed. . In FIG. 1, in order to make the arm support portion 1 b easier to see, the portions that should appear in the drawing of the heat dissipating fins disposed near the center portion are omitted.

  The lamp body 1 is provided with a bowl-shaped thick portion 1d extending in the left-right direction in FIG. And the arm support part 1b is integrally formed and arrange | positioned on the thick part 1d formed in the back surface of the lamp 1 and the position straddling the optical axis. Note that the back surface of the region where the thick portion 1d is not formed is formed to have the same thickness as the thickness shown by hatching in the left-right direction in FIG.

  The arm support portion 1b has a pair of pivoting arms 1b1 and 1b1 projecting in a U-shape from the rear central portion of the lamp body 1. In addition, although not visible in FIG. 1, a pivot insertion hole is formed in the pair of pivoting arms 1b1 and 1b1.

  The housing recess 1 c is formed inside the bottomed cylindrical portion of the lamp body 1 and opens to the front surface of the lamp body 1. The innermost portion of the housing recess 1c is a top surface portion, and a peripheral wall surface portion that hangs down from the periphery of the top surface portion toward the opening is formed.

  The substrate 2 has a disk shape, and is accommodated in the substrate accommodating recess 1c1 formed in the top surface portion of the accommodating recess 1c with the back surface closely attached to the lamp body 1. A plurality of, for example, four LED light sources 2 a are mounted on the front surface of the substrate 2. Although not shown in the drawings, the top surface portion of the lamp body 1 has a through-hole through which the insulation-coated conductor 6 for supplying power from the lighting circuit arranged at the separated position to the LED light source 2a on the substrate 2 side passes. Is provided.

  An appropriate number, for example, four of the LED light sources 3 are equally distributed along a concentric circle centered on the optical axis of the lamp body 1 and are mounted on the front surface of the substrate 2. Radiated downward.

  The reflecting plate 4 has the same number of reflecting surfaces as the plurality of LED light sources 3, and the LED light sources 3 and the reflecting surfaces are arranged to face each other in a one-to-one relationship. The entire reflecting plate 4 is accommodated in the accommodating recess 1c.

  The metal support arm 5 is formed of a hollow pipe, and the front end portion 5a is sandwiched between the pair of pivoting arms 1b1 and 1b1 of the arm support portion 1b in a heat-conducting relationship, and is fixed to the lamp body 1 by a pivot. Is connected to the back surface of the lamp body 1 so as to be rotatable.

  The insulation-coated conductive wire 6 connects a lighting circuit (not shown) and the substrate 2 to provide a supply circuit for the lighting power of the LED light source 3. At least most of the length is inserted into the support arm 5.

  Thus, in the first embodiment, when the LED light source 3 is turned on, the temperature of the central portion of the substrate 2 is increased, and the temperature distribution of the back surface of the lamp body 1 is correspondingly increased in the central portion. Since the metal support arm 5 is attached to the center portion, the heat of the center portion is efficiently radiated through the metal support arm 5 so that the entire substrate 2 is soaked, and the substrate 2 can be lowered. As a result, it is possible to suppress a decrease in light output of the LED light source 3 and to prevent uneven color and uneven brightness.

  Further, by providing the thick portion 1d on the back surface of the lamp body, the heat generated during the lighting of the LED light source 3 can be easily concentrated on the back portion of the lamp body 1, and the metal attached to the thick portion 1d. It becomes easy to conduct to the support arm 5 made. This is because heat is easily transmitted in a portion having a large heat capacity. Therefore, by attaching the metal support arm 5 to the thick part 1d, the heat concentrated in the central part can be effectively radiated through the metal support arm 5. Accordingly, the temperature of the entire lamp body 1 and the substrate 2 can be lowered while the temperature on the back side of the lamp body 1 is soaked.

  FIG. 2 is a partial cross-sectional front view showing a second mode for carrying out the lighting fixture of the present invention. In the figure, the same parts as those in FIG.

  In this embodiment, in addition to the bowl-shaped thick portion 1d in the first embodiment, an edge portion 1e protruding from the back surface to the height of the thick portion 1d is formed on the peripheral portion of the back surface. And the radiation fin 1a protrudes back from the back surface of the inner peripheral side region of the edge 1e.

  Thus, in the present embodiment, the thick portion 1d of the lamp body 1 is formed between the peripheral portions through the central portion of the lamp body 1, and further the metal support arm 5 so as to sandwich the thick portion 1d from the left and right. Therefore, the heat at the center of the substrate 2 can be radiated from the metal support arm 5 through the thick portion 1d.

  3 and 4 are a partial cross-sectional front view and a side view showing a lighting apparatus as a reference example for the present invention. In the figure, the same parts as those in FIG. In this reference example, the support arm 5 ′ is curved in a U shape, and is pivotally attached to the opposite side surfaces of the lamp body 1 using bolts 7. In order to regulate the rotation angle range of the lamp body 1, a protrusion 1 f is formed integrally with the lamp body 1, and an arcuate groove 5 b ′ in which the protrusion 1 f engages is formed in the support arm 5 ′.

The partial cross section front view which shows the 1st form for implementing the lighting fixture of this invention The partial cross section front view which shows the 2nd form for implementing the lighting fixture of this invention The partial cross section front view which shows the lighting fixture as a reference example with respect to this invention Same side view

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lamp body, 1a ... Radiation fin, 1b ... Arm support part, 1b1 ... Pivoting arm, 1c ... Accommodation recessed part, 1c1 ... Substrate accommodation recessed part, 1d ... Thick part, 2 ... Board | substrate, 3 ... LED light source, 4 ... Reflector plate, 5 ... metal support arm, 5a ... tip, 6 ... insulated conductor wire

Claims (2)

A lamp body made of a heat-conducting metal having a radiating fin projecting on the back side, an arm support portion being disposed avoiding the radiating fin in a substantially central part of the back surface, and an accommodating recess on the front side;
An LED light source housed in a heat conducting relationship in the housing recess of the lamp body;
A metal support arm whose tip is attached to the arm support of the lamp body and supports the lamp body;
The lighting fixture characterized by comprising.   The lighting fixture according to claim 1, wherein the lamp body has a relatively large thickness on the back side of the substrate housing recess at the center.

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