JP2016167362A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire which enables efficient snow melting.SOLUTION: A luminaire 10 of the invention includes: LEDs 20; an insulation heat transfer base material to which the LEDs 20 are attached, the insulation heat transfer base material configured to extract heat from the LEDs 20; a cover member 50 which covers the LEDs 20 so as to sandwich the LEDs 20 with the insulation heat transfer base material; a high heat transfer member which transfers heat extracted by the insulation heat transfer base material to the cover member 50 side; and a heat insulation member which covers the entire high heat transfer member and insulates the high heat transfer member. A metal film 54 is provided on an inner layer 52 of the cover member 50. The high heat transfer member contacts with the metal film 54.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device such as a street light, a crime prevention light, an automobile lamp, and a traffic light lamp used outdoors such as a snowfall area.

  In recent years, LEDs (Light Emitting Diodes) have improved in performance, have a tendency to decrease in price, and have an advantage of a longer lifetime, and have been actively used as an alternative to conventional light sources.

  More recently, not only indoor lighting devices but also street lighting, crime prevention lights, garden lights, light fixtures, automobile lamps, traffic light lamps, etc., as lighting devices mainly used outdoors such as roads and parks. LEDs have been adopted.

  When such an LED lighting device is used outdoors such as a snowfall area, there is a problem that surroundings cannot be illuminated with a sufficient amount of light due to snow accumulation on the light emitting surface side. In view of this, an illumination device that is applied to automobiles in snowfall areas has been proposed that can melt snow on the surface using heat of an LED light source.

For example, in Patent Document 1 (Japanese Patent Publication No. 2006-140084), a lamp unit having a light emitting diode as a light source in a lamp chamber formed of an outer lens and a lamp body, and between the lamp unit and the outer lens. A vehicular lamp comprising a covering member disposed close to the inner surface of the outer lens in a state of covering a range excluding the light emitting area of the lamp unit when viewed from the front,
There is disclosed a vehicular lamp characterized in that the covering member is formed of a material having high thermal conductivity and heat generated by the light emitting diode is transmitted to the covering member.
Japanese Patent No. 2006-140084

  Although it is important to effectively transfer the heat generated by the LED to the cover part (covering member), there is a problem that the conventional technology is not sufficient. In order to transfer the heat generated by the LED, it is necessary to use the heat transfer phenomenon, but since the material with high heat transfer property is also excellent in heat dissipation, the transfer process unless an appropriate heat insulating structure is provided However, heat is diffused in the atmosphere, but this is not a problem in the prior art.

  In addition, a transparent member having translucency is used for the cover part (covering member) to transmit light emitted from the LED light source, but such a transparent member generally has low heat conductivity and is transferred from the heat source. There was a problem that the heat generated could not be efficiently used for melting snow.

This invention is for solving the above subjects, and the illuminating device which concerns on this invention heats the heat | fever from these LED while a plurality of LED and these LED are attached. The insulating heat transfer substrate and the plurality of LEDs are sandwiched between the insulating heat transfer substrates, the cover member covering the plurality of LEDs, and the heat collected by the insulating heat transfer substrate A high heat transfer member that transfers heat to the cover member side, and a heat insulating member that covers the entire high heat transfer member and insulates the high heat transfer member, and a metal film is provided on the inner layer of the cover member The high heat transfer member and the metal film are in contact with each other.

  In the illumination device according to the present invention, the surface of the cover member has water repellency.

  Moreover, the illuminating device according to the present invention is characterized in that the insulating heat transfer base is made of a resin mixed with a heat conductive filler.

  In the illumination device according to the present invention, the high heat transfer member is a graphite sheet.

  In the lighting device according to the present invention, the high heat transfer member is aluminum.

  Moreover, the lighting device according to the present invention is characterized in that the heat insulating member is silica aerogel.

  In the illumination device according to the present invention, the metal film is in a grid shape.

  In the illumination device according to the present invention, the metal film is an ITO electrode material.

  The lighting device according to the present invention includes a heat insulating member that covers the entire high heat transfer member and insulates the high heat transfer member, and a metal film is provided on the inner layer of the cover member. And the metal film are in contact with each other so that the heat generated by the LED can be efficiently transferred by the high heat transfer member, and the heat is transferred from the high heat transfer member to the metal film in the inner layer of the cover member. Therefore, efficient snow melting can be performed.

It is a figure explaining the outline | summary of the illuminating device 10 which concerns on embodiment of this invention. It is a figure explaining the heat collection structure in the 2nd surface 12 of the illuminating device 10 which concerns on embodiment of this invention, a heat-transfer structure, and a heat insulation structure. It is a figure explaining the detailed structure of the edge part 15 of the illuminating device 10 which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an outline of a lighting device 10 according to an embodiment of the present invention. FIG. 1A is a diagram schematically showing a cross-sectional structure of the lighting device 10, and FIG. 1B is a front view of the lighting device 10.

  The illuminating device 10 according to the present invention has a first surface 11 and a second surface 12 that is in a front-and-back relationship with the first surface 11 and is projected from the first surface 11 side. ing. Note that the electrical wiring and the like of the lighting device 10 are not shown.

  A plurality of LEDs 20 are attached to an insulating heat transfer substrate 41 provided on the second surface 12 side. Moreover, the illuminating device 10 which concerns on this invention has the cover member 50 which covers several LED20 so that several LED20 may be pinched | interposed with the insulating heat-transfer base material 41. FIG. The cover member 50 is made of a transparent synthetic resin member except for the grid-like metal film 54 described later. The cover member surface 57 of the cover member 50 is provided with water repellency.

  In order to impart water repellency to the cover member surface 57, water-repellent spray or water-repellent wax can be used, but water repellency can be imparted by a fine structure as described in, for example, Japanese Patent No. 5626441, Like water-repellent spray and water-repellent wax, the effect can be kept functioning without disappearing with time. Due to the water repellency of the cover member surface 57 like this, it becomes possible to more efficiently remove snow and ice that have been made water droplets by heat. In addition, this specification refers to the content of patent 5626441, and uses it.

  Next, with reference to FIG. 2, the heat collection structure in the 2nd surface 12 of the illuminating device 10 which concerns on embodiment of this invention, a heat-transfer structure, and a heat insulation structure are demonstrated. FIG. 2 shows an enlarged view of the LED 20 attached to the insulating heat transfer substrate 41.

  The LED 20 includes a light emitting part 21, a bottom part 23, and an electrode part 25 extending from the bottom part 23. Electrical wiring (not shown) is connected to the electrode portion 25, whereby power is supplied to the LED 20 and light can be extracted from the light emitting portion 21. In the process where power is supplied to the LED 20, the bottom surface portion 23 generates heat in particular, so that this heat is conducted to the insulating heat transfer base material 41. For this reason, between the bottom face part 23 of LED20 and the insulating heat-transfer base material 41, the heat conductive material 30 with high heat conductivity and high electrical insulation is arranged. As such a heat conductive material 30, for example, heat radiation grease can be used.

  On the second surface 12 side of the lighting device 10, an insulating heat transfer base material 41 that efficiently transfers heat generated from the bottom surface portion 23 of the LED 20 to the high heat transfer member 43, and heat from the insulating heat transfer base material 41. Has a three-layer structure of a high heat transfer member 43 that transfers the heat to the first surface 11 side and a heat insulating member 45 that suppresses heat radiation from the high heat transfer member 43 into the air.

  Here, the heat insulating member 45 also insulates the high heat transfer member 43 by covering the high heat transfer member 43 at the end 15 of the lighting device 10. That is, in the illuminating device 10 according to the present invention, the heat insulating member 45 covers the entire high heat transfer member 43 so that the LED 20 can efficiently generate heat without the high heat transfer member 43 being exposed to the air. 10 can be guided to the cover member 50 disposed on the first surface 11 side.

  Here, the insulating heat transfer substrate 41 can be composed of a resin mixed with a heat conductive filler. As such a filler, alumina (aluminum oxide) or boron nitride can be used. Further, as the high heat transfer member 43, graphite sheet or aluminum may be used. Further, as the heat insulating member 45, silica airgel, glass wool, or the like can be used.

  Next, FIG. 3 is a diagram illustrating a detailed structure of the end portion 15 of the lighting device 10 according to the embodiment of the present invention, and schematically shows a cross-sectional structure at the end portion 15.

  In the illuminating device 10 according to the present invention, as shown in FIG. 3, the high heat transfer member 43 wraps around the end portion 15 of the illuminating device 10 from the first surface 11 side to the second surface 12 side of the illuminating device 10. It is like that.

  In the cover member inner layer 52 of the cover member 50, the grid-like metal film 54 is provided on the entire surface, and the high heat transfer member 43 wrapping around the first surface 11 comes into contact with the grid-like metal film 54. It is like that. The grid-shaped metal film 54 that is in contact with the high heat transfer member 43 can transfer heat to the entire surface of the cover member 50, thereby melting snow adhering to the first surface 11 of the cover member 50. It is possible to blur.

  In the present embodiment, the grid-like metal film 54 is used as the heat conductive member provided in the cover member inner layer 52, and the first surface 11 of the cover member 50 is secured on the first surface 11 while ensuring the transparency of the cover member 50. Although heat is transferred to promote snow melting in the cover member 50, an ITO electrode material or the like may be used instead of the grid-like metal film 54.

  As described above, the lighting device 10 according to the present invention includes the heat insulating member 45 that covers the entire high heat transfer member 43 and insulates the high heat transfer member 43, and the grid-like metal film 54 is formed on the inner layer of the cover member 50. The heat transfer member 43 and the grid-like metal film 54 are in contact with each other, and the heat generated in the LED 20 can be efficiently transferred by the high heat transfer member 43 and the high heat transfer Since heat is transmitted from the member 43 to the grid-like metal film 54 in the inner layer of the cover member 50, it is possible to efficiently melt snow.

DESCRIPTION OF SYMBOLS 10 ... Illuminating device 11 ... 1st surface 12 ... 2nd surface 15 ... edge part 20 ... LED
21 ... Light-emitting part 23 ... Bottom part 25 ... Electrode part 30 ... Heat conduction material 41 ... Insulating heat transfer base material 43 ... High heat transfer member 45 ... Heat insulation member 50 ... Cover member 52 ... Cover member inner layer 54 ... Grid-shaped metal film 57 ... Cover member surface

Claims (8)

A plurality of LEDs;
The plurality of LEDs are attached, and an insulating heat transfer base material that collects heat from the plurality of LEDs,
A cover member that covers the plurality of LEDs in such a manner as to sandwich the plurality of LEDs with the insulating heat transfer base material;
A high heat transfer member that transfers heat collected by the insulating heat transfer base material to the cover member side;
A heat insulating member that covers the entirety of the high heat transfer member and insulates the high heat transfer member;
A metal film is provided on an inner layer of the cover member, and the high heat transfer member and the metal film are in contact with each other. The lighting device according to claim 1, wherein a surface of the cover member has water repellency. The lighting device according to claim 1, wherein the insulating heat transfer base is made of a resin mixed with a heat conductive filler. The lighting device according to claim 1, wherein the high heat transfer member is a graphite sheet. The lighting device according to claim 1, wherein the high heat transfer member is aluminum. The lighting device according to any one of claims 1 to 5, wherein the heat insulating member is silica aerogel. The lighting device according to claim 1, wherein the metal film has a grid shape. The lighting device according to claim 1, wherein the metal film is an ITO electrode material.

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