JP2017004709A - Led illumination member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize both extension of the life of an illumination member and reduction of snow accretion on a front cover of the illumination member.SOLUTION: The present invention relates to an LED illumination member 1 comprising: a light bulb 10 mounting one or two or more light-emitting diodes 15; a light cover 30 coming in contact a portion of the light bulb 10, covering an outer periphery of the portion of the light bulb 10, and opening in an illumination direction; and a light-transmission front cover 40 covering an opening portion of the light cover 30, at least a metal layer 32 being provided in the light cover 30, and one or a plurality of wires 43 propagating heat from the metal layer 32 and superior in heat conductivity than the front cover 40 being provided on a front surface or within the front cover 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an LED illumination member.

  The LED is a pn junction diode obtained by joining a p-type semiconductor and an n-type semiconductor, and is known as a light source that can directly convert electric power into light energy. When a voltage is applied in the forward direction (direction from p to n) of the diode, holes flowing through the conduction band in the p-type semiconductor and electrons flowing through the valence band in the n-type semiconductor are near the pn junction. Recombine beyond the forbidden body. At this time, energy corresponding to the width of the forbidden body is emitted as light. Unlike a light bulb with a built-in high-resistance filament, light emitted from an LED is converted from electric power without passing through heat generation, and thus has characteristics such as low heat generation and low power consumption. Taking advantage of this characteristic, LEDs are used in various illumination members such as indoor lighting, traffic lights, and headlights for automobiles.

  However, in winter and snowy areas, there is a problem that ice and snow attached to the front cover of the traffic light does not melt, and the light of the traffic light cannot be seen by drivers and pedestrians. In addition, the front cover of the headlight for automobiles also has the problem that ice and snow adhere to the same principle, so that sufficient brightness is not ensured when driving at night, and the driver is at increased risk of driving at night. Such a problem hardly occurs when a light bulb with a high resistance filament is used, because the front cover of the illumination member receives heat from the filament. That is, the above problem has emerged as a new problem peculiar to an LED lighting member having a lower calorific value than a light bulb with a built-in filament.

  Conventionally, various measures have been taken to solve such problems. For example, a method is known in which a transparent snow-prevention plate is attached to the front face of a display device of a traffic light so that snow falls downward along the inclination of the snow-prevention plate (for example, Patent Documents). 1). In addition, a method is also known in which a planar heating element that generates heat by energization is disposed between a front cover on the front surface of the illumination member and an LED light emitting portion inside the front cover (for example, Patent Document 2 and Patent Document 3). See).

JP 2003-109187 A JP 2009-145952 A JP 2014-109970 A

  Although the above conventional countermeasures have some effects, they are not always sufficient. The method disclosed in Patent Document 1 is to attach a downwardly inclined plate for the purpose of preventing snow accretion. However, this method is applicable only to traffic lights, and not applicable to all illumination members. Moreover, even if the anti-skid plate is tilted forward, it is not uncommon for snow to come in, and this is not a perfect method. Next, the methods disclosed in Patent Documents 2 and 3 have a comparatively great effect because the front cover is heated by the planar heating element to prevent snow on the surface. However, for that purpose, since energization is required, the merit of low power consumption of the LED illumination member is reduced.

  On the other hand, in an illumination member for high-luminance applications, it is required to mount as many LEDs as possible. When a high-power LED of 5 W or more is used, even if the number of mounted LEDs is small, high heat that cannot be ignored is generated, and the life of the illumination member is shortened. Therefore, the LED illuminating member needs to heat the front cover while it requires heat radiation from the LED during snowfall.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to achieve both a long life of the illumination member and a reduction in snow accumulation on the front cover of the illumination member.

  In order to achieve the above object, an LED illumination member according to an embodiment of the present invention is in contact with a light valve mounting one or more light emitting diodes, a part of the light valve, and a part of the light valve. A light cover that covers the outer periphery and opens in the illumination direction, and a translucent front cover that covers the opening of the light cover, and includes at least a metal layer on the light cover, on the surface or inside of the front cover, It is a wire that conducts heat from the metal layer and has one or more wires that are more thermally conductive than the front cover.

  The LED illumination member according to another embodiment may further include wires in a lattice shape in a plan view of the front cover.

  In the LED lighting member according to another embodiment, the wire may be mainly composed of aluminum, copper, or an alloy including at least one of them.

  In the LED illumination member according to another embodiment, the light cover may further include a foam rubber layer outside the metal layer.

  In the LED illuminating member according to another embodiment, the foamed rubber layer may be further configured using foamed silicone rubber.

  In the LED lighting member according to another embodiment, the metal layer may be mainly composed of aluminum, copper, or an alloy including at least one of them.

  In the LED illuminating member according to another embodiment, the metal layer may be in contact with the wire with a rubber member having higher thermal conductivity than the foamed rubber layer interposed therebetween.

  In the LED illumination member according to another embodiment, the rubber member may be further configured using silicone rubber.

  ADVANTAGE OF THE INVENTION According to this invention, coexistence with the lifetime improvement of an illumination member and reduction of the snowfall to the front cover of an illumination member can be aimed at.

FIG. 1 shows a partially transparent perspective view (1A) of the LED illuminating member according to the first embodiment of the present invention and a schematic view (1B) of the laminated state of the light cover, respectively. FIG. 2 shows an assembly drawing (2A, 2B) of the light valve of FIG. FIG. 3 is a cross-sectional view taken along line II of the LED illumination member of FIG. 4 shows an enlarged view (4A) of a part X and an enlarged view (4B) of a part Y in FIG. 3, respectively. FIG. 5 shows a front view of the front cover in FIG. FIG. 6 is an enlarged sectional view of a part of the light cover constituting the LED illuminating member according to the second embodiment, and is an enlarged sectional view (6A) of a part X similar to FIG. An enlarged sectional view (6B) of FIG. FIG. 7 is an enlarged cross-sectional view of a part of the light cover that constitutes the LED illuminating member according to the third embodiment, and is an enlarged cross-sectional view (7A) of a part X similar to FIG. An enlarged sectional view (7B) of FIG. FIG. 8: shows the expanded sectional view of the part X similar to FIG. 4 in the light cover which comprises the LED lighting member which concerns on 4th Embodiment. FIG. 9 is an assembled perspective view of a part of the LED illumination member according to the fifth embodiment.

  Next, each embodiment of the LED illumination member according to the present invention will be described. However, each embodiment described below is a preferred embodiment of the LED illumination member according to the present invention, and each configuration included in the embodiment is essential for the LED illumination member according to the present invention. It is not necessarily the configuration.

1. First Embodiment (1) Overall Configuration of LED Illuminating Member FIG. 1 is a partially transmissive perspective view (1A) of an LED illuminating member according to a first embodiment of the present invention and the state of lamination of its light cover. A schematic diagram (1B) is shown respectively.

  The LED illumination member 1 according to this embodiment is in contact with a light valve 10 on which one or more light emitting diodes (hereinafter referred to as “LEDs”) are mounted, a part of the light valve 10, and A light cover 30 that covers the outer periphery and opens in the illumination direction, and a translucent front cover 40 that covers the opening of the light cover 30 are provided. The light valve 10 is provided with a socket member 20 at one end thereof, and connected to an external power source (regardless of whether it is an AC power source or a DC power source, the same applies hereinafter) via the socket member 20 to the LED. Power supply. In addition, the light valve 10 preferably includes a flange 25 between the front end located on the front cover 40 side and the socket member 20. In the light valve 10, preferably, a region from the flange 25 to the tip of the light valve 10 is disposed inside the light cover 30, and a region from the lower part of the flange 25 to the socket member 20 is disposed outside the light cover 30. As described above, the light cover 30 is attached.

  In this embodiment, the light cover 30 has a substantially cup shape, and is provided with a front cover 40 covering the opening surface on the opening surface. The light cover 30 is configured by laminating a foamed rubber layer 31, a metal layer 32, a rubber member 33, and a reflective layer 34 in this order from the outside in the thickness direction to the inside (see FIG. 4). The foamed rubber layer 31, the metal layer 32, the rubber member 33, and the reflective layer 34 all have a cup shape, and are provided with through holes 31a, 32a, 33a, 34a, respectively, at the bottom. The front cover 40 is a cover that is convex in the illumination direction of the LED illumination member 1, and is preferably fixed to the light cover 30 so that the opening end surface thereof is in contact with the reflective layer 34. However, the shape of the front cover 40 may be a flat plate shape instead of a convex shape in the illumination direction. The front cover 40 preferably includes a heat conductive layer 42 at least on the opening end surface thereof. Further, the front cover 40 includes one or more wires 43 that conduct heat from the metal layer 32 therein. In this embodiment, the wires 43 are preferably provided in a lattice shape in a plan view of the front cover 40 (view from the illumination direction or the opposite direction). However, the wire 43 may be provided in the inside of the front cover 40 in a form other than the lattice form, for example, in a comb shape. The wire 43 is connected to the heat conductive layer 42 and is made of a material that has better heat conductivity than the front cover 40. For this reason, the heat transmitted from the LED through the metal layer 32 is transmitted from the heat conductive layer 42 to the wire 43 and further transmitted to the front cover 40.

(2) Light Valve FIG. 2 shows an assembly drawing (2A, 2B) of the light valve of FIG.

  As shown in FIG. 2, the light valve 10 preferably includes a plurality of LEDs 15 on the upper surface and side surfaces of the sleeve 11. The light valve 10 includes a sleeve 11, a convex transparent member 12, a substrate 13, a side surface covering transparent member 14, and a flexible substrate 19. In this embodiment, the sleeve 11 has a cylindrical shape, but may have a polygonal cylindrical shape of a triangle or more. Further, instead of the sleeve 11, a solid columnar or polygonal columnar member may be used. The sleeve 11 extends in one direction and has an area where many LEDs 15 can be mounted. The sleeve 11 is made of a material having high thermal conductivity so that heat can be effectively radiated from the LED 15. The constituent material of the sleeve 11 includes a metal material with high thermal conductivity typified by aluminum, aluminum alloy, etc .; ceramics with high thermal conductivity typified by aluminum nitride, diamond-like carbon, etc .; Examples include metal materials or composite materials in which ceramics are dispersed. Since the sleeve 11 is in a non-contact state with the wiring on the substrate 13 and the flexible substrate 19, the sleeve 11 may be made of a material having excellent electrical insulation or may not be made of a material having excellent electrical insulation. . For this reason, for example, a metal material such as aluminum can be used as a constituent material of the sleeve 11.

  The sleeve 11 includes a concave region 17 whose outer surface is slightly recessed inward at a substantially central portion in the length direction. The recessed area 17 includes a through hole 18 having a shape and a size capable of exposing the LED 15 from the inner side to the outer side of the sleeve 11. The number of through holes 18 is not particularly limited, but is preferably equal to or more than the number of LEDs 15.

  The LED 15 exposed from the side surface of the sleeve 11 is mounted on a sleeve-shaped flexible substrate 19 having a smaller diameter than the sleeve 11. The constituent material of the flexible substrate 19 is not particularly limited as long as it is excellent in electrical insulation and has elasticity. On the surface of the flexible substrate 19, wiring (not shown) (preferably made of a metal capable of being energized and having excellent electrical conductivity) is formed. The flexible substrate 19 is inserted into the sleeve 11 with its cylindrical diameter being reduced, and the LED 15 is passed through the through hole 18 and is fixed inside the sleeve 11. The flexible substrate 19 is preferably formed such that the cylinder is not completely closed, and a part thereof is cut in the vertical direction so that the cylinder diameter can be easily changed. However, you may comprise the flexible substrate 19 in the cylinder shape closed completely in the circumferential direction. Further, instead of the cylindrical flexible substrate 19, three LEDs 15 are vertically mounted on a strip-shaped flexible substrate, and a plurality of the strip-shaped flexible substrates are arranged on the inner wall of the sleeve 11 along the circumferential direction. It may be fixed. Further, the flexible substrate 19 may be attached to the outer surface of the sleeve 11. In that case, the through hole 18 is not necessarily required.

  The side covering transparent member 14 is a substantially cylindrical member that can be attached to the concave region 17 of the sleeve 11, and is preferably composed of highly transparent resin, rubber, or glass that allows light emitted from the LED 15 to be transmitted outside. The Similarly to the flexible substrate 19, the side covering transparent member 14 is not completely closed, and a part of the side covering transparent member 14 is cut in the vertical direction so that the concave region 17 can be covered easily. You may be comprised in the cylinder shape closed in the direction.

  The substrate 13 can be attached to the top surface (also referred to as the upper surface) of the sleeve 11 and has a thin disk shape in this embodiment. If the shape of the upper surface of the sleeve 11 is a polygon, the substrate 13 is preferably a plate-like member having the same shape as the polygon. The substrate 13 includes LEDs 15 on the outer surface thereof. The number of LEDs 15 is not limited as long as it is one or more. However, the LED 15 is not necessarily provided on the top surface of the sleeve 11.

  The convex transparent member 12 is preferably composed of a highly transparent resin, rubber, or glass that allows light emitted from the LED 15 provided on the top surface side of the sleeve 11 to be transmitted to the outside. When the LED 15 does not protrude from the top surface of the sleeve 11, a flat plate-type transparent member may be used instead of the convex transparent member 12. Further, when the LED 15 is not provided on the top surface of the sleeve 11, it is not necessary to provide the convex transparent member 12. The light valve 10 includes a power supply terminal 16 that is electrically connected to the LED 15 on the flexible substrate 19 and the substrate 13 so as to protrude toward the socket member 20. The energization terminal 16 is a part that can receive power from an external power source.

  The socket member 20 is preferably made of a material having lower thermal conductivity than the metal layer 32. This is because the heat transmitted from the LED 15 to the sleeve 11 is preferentially transmitted to the metal layer 32 side rather than the socket member 20 side. The material constituting the socket member 20 is preferably made of resin, and a material having lower thermal conductivity than the metal layer 32 can be used without any particular limitation. As a material constituting the socket member 20, polyamide, polypropylene, polyethylene terephthalate, acrylic resin, polybutylene terephthalate, polycarbonate, polyphenylene sulfide, ABS resin, or the like can be preferably used. Particularly preferred resins are polycarbonate, polyamide or polyphenylene sulfide. The energizing terminal 16 is not particularly limited as long as it is a material having excellent conductivity, but examples thereof include copper, silver, aluminum, aluminum alloy, and tungsten.

  The flange portion 25 is preferably substantially disk-shaped, and includes a through hole 26 that can be fixed by penetrating the sleeve 11 at a substantially central portion thereof. The collar portion 25 is fixed to the region of the sleeve 11 and is locked to the reflective layer 34 inside the light cover 30, so that the light valve 10 cannot be pulled backward from the bottom portion of the light cover 30. .

(3) Light cover FIG. 3: shows the II sectional view taken on the line of the LED illumination member of FIG. 4 shows an enlarged view (4A) of a part X and an enlarged view (4B) of a part Y in FIG. 3, respectively.

  The light cover 30 has a through hole 30 a at the bottom of the cup shape, and contacts the sleeve 11 of the light valve 10. The light cover 30 is configured by laminating a foamed rubber layer 31, a metal layer 32, a rubber member 33, and a reflective layer 34 in this order from the outer side to the inner side in the thickness direction. The three layers of the foamed rubber layer 31, the metal layer 32, and the rubber member 33 have a shape whose front is narrowed so as to hold the front cover 40. Further, the front cover 40 is in contact with the rubber member 33 at the front outer peripheral portion 41 thereof. The light cover 30 preferably has a foamed rubber layer 31 formed on one side of a metal frame extending radially from the substantially central ring (through hole 32a), and a rubber member 33 and a reflective layer on the back side of the one side. 34 can be formed, and the laminate can be formed into a cup shape. However, the manufacturing method is only an example, and the manufacturing method of the light cover 30 is not limited to the manufacturing method.

  As shown in FIG. 4 (4A), the foamed rubber layer 31 includes many spaces (also referred to as pores) 35 inside the layer. The space 35 is filled with air. Since air has high heat insulating properties, the foamed rubber layer 31 is a layer having high heat insulating properties. The constituent material of the foam rubber layer 31 is a thermosetting elastomer such as silicone rubber, urethane rubber, ethylene propylene rubber or ethylene propylene diene rubber; thermoplastic elastomer such as urethane, ester, styrene, olefin or fluorine Alternatively, a composite thereof or the like can be used, and in particular, silicone rubber can be more preferably used. The foamed rubber layer 31 functions as a heat insulating material that does not escape the heat transmitted through the metal layer 32 to the outside in the thickness direction of the light cover 30. A method in which the metal layer 32 is the outermost layer and the foamed rubber layer 31 is not provided is also conceivable. In that case, since air exists outside the metal layer 32, it is difficult to dissipate heat from the metal layer 32. However, since the outside air temperature is low (for example, minus 2 to 10 degrees) in winter, if the metal layer 32 is exposed, the metal layer 32 is easily cooled. For this reason, it is preferable to cover the metal layer 32 with the foamed rubber layer 31. The average thickness of the foamed rubber layer 31 is preferably 2 mm to 20 mm, more preferably 5 mm to 8 mm.

  The metal layer 32 functions as a layer for transferring heat from the light valve 10 to the front cover 40. The metal layer 32 is a member that has extremely high thermal conductivity, has little heat radiation on the surface thereof, and easily transfers heat toward the front cover 40. Examples of the material constituting the metal layer 32 include mainly aluminum, copper, or an alloy containing at least one of them. The metal layer 32 can be made of metal other than aluminum, copper, or an alloy thereof, such as stainless steel, gold, silver, iron, and brass. However, when comparing only the thermal conductivity values (see Science Chronology Book 84), silver (420 W / m · K)> copper (398 W / m · K)> gold (320 W / m · K)> aluminum (236 W / m · K)> brass (106 W / m · K)> iron (84 W / m · K), and taking the cost and formability into consideration, the metal layer 32 is made of aluminum, copper, or at least one of them. It is preferable to use an alloy containing one as a main material. The metal layer 32 is preferably a bone-shaped formed body in which a metal wire having a wire diameter of 0.1 mm to 0.7 mm, more preferably 0.2 mm to 0.5 mm, is formed in an umbrella shape. However, the metal layer 32 may be a cup-shaped molded body.

  In this embodiment, the rubber member 33 is one of the layers constituting the light cover 30, and is provided on the inner side in the thickness direction of the light cover 30 than the metal layer 32. The rubber member 33 is preferably made of a material having higher thermal conductivity than the foamed rubber layer 31 and has a function of effectively transferring the heat transmitted from the light valve 10 to the metal layer 32. For this reason, the rubber member 33 may be provided only at the contact portion with the light valve 10. Further, as described later, it may be merely interposed between the metal layer 32 and the front cover 40.

  Examples of the constituent material of the rubber member 33 include thermosetting elastomers such as silicone rubber, urethane rubber, ethylene propylene rubber, and ethylene propylene diene rubber; thermoplastic elastomers such as urethane, ester, styrene, olefin, and fluorine; Or those composites etc. can be used and especially silicone rubber can be used more suitably. In order to further increase the thermal conductivity of the rubber member 33, a filler having a thermal conductivity higher than that of the rubber member 33 itself may be mixed in the rubber member 33 in a range of 3.0 to 40.0% by volume. For example, aluminum nitride (170 W / m · K), aluminum oxide (16 to 39 W / m · K), or the like can be used as the filler.

  The reflective layer 34 is a layer that reflects the light from the LED 15 to emit light from the front cover 40. When the reflective layer 34 is manufactured from a metal plate, the inner surface of the metal plate (the surface on the light valve 10 side) is preferably a mirror surface. The reflective layer 34 is not a molded product of a metal plate, but may be a layer in which a metal particle-containing paint is applied to the inner side surface of the rubber member 33 or a metal vapor deposition layer.

(4) Front cover FIG. 5 shows a front view of the front cover in FIG.

  The front cover 40 is preferably made of glass or highly translucent resin. Examples of highly translucent resins include acrylic resins and polycarbonate resins. The average thickness of the front cover 40 is preferably 5 mm to 20 mm, and more preferably 7 mm to 10 mm.

  The front cover 40 is provided with a grid-like wire 43 embedded therein, and an end portion of the wire 43 is connected to a heat conductive layer 42 formed on an end surface of the front cover 40. As each material of the wire 43 and the heat conductive layer 42, it can be comprised from the metal material similar to the above-mentioned metal layer 32 suitably. For example, the wire 43 or the heat conductive layer 42 can be preferably composed mainly of tungsten, aluminum, copper, or an alloy containing at least one of them. However, ceramics having excellent thermal conductivity such as aluminum nitride may be used for each material of the wire 43 or the heat conductive layer 42. The heat conductive layer 42 may be formed on the end face of the front cover 40 by any method such as vapor deposition, coating, printing, and laminating. The wire 43 may be provided in the front cover 40 by any method. For example, the front cover 40 is manufactured by insert molding in which the wire 43 is set in a mold at the time of manufacture, a molten composition for forming a base material of the front cover 40 is supplied thereto, and the composition is cured. It can manufacture suitably.

  The wire 43 preferably has an outer diameter that is as thin as possible so as not to reduce the translucency of the front cover 40. As a suitable outer diameter of the wire 43, 10 micrometers-100 micrometers, for example, More preferably, 50 micrometers-100 micrometers can be illustrated. The opening ratio of the front cover 40 (the ratio of the area of the opening portion to the total area of the front surface of the front cover 40) is at least 0.95, and preferably 0.98 or more.

2. Second Embodiment Next, a second embodiment of the LED illumination member of the present invention will be described. In this embodiment, portions common to the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 6 is an enlarged sectional view of a part of the light cover constituting the LED illuminating member according to the second embodiment, and is an enlarged sectional view (6A) of a part X similar to FIG. An enlarged sectional view (6B) of FIG.

  The light cover 30 constituting the LED illuminating member 1 according to the second embodiment differs from the first embodiment in that a rubber layer 37 is provided outside the metal layer 32 in place of the foam rubber layer 31. . The other structure in the LED lighting member 1 according to the second embodiment is common to the structure of the first embodiment. The rubber layer 37 is preferably made of a material having low heat conductivity, and preferably made of silicone rubber having low heat conductivity. For this reason, as in the first embodiment, the heat transmitted through the metal layer 32 is mainly transmitted to the rubber member 33 side preferentially over the rubber layer 37 as shown by the route Q, and to the wire 43. And promptly communicate.

3. Third Embodiment Next, a third embodiment of the LED illumination member of the present invention will be described. In this embodiment, parts that are the same as those in the first and second embodiments are given the same reference numerals, and redundant descriptions are omitted.

  FIG. 7 is an enlarged cross-sectional view of a part of the light cover that constitutes the LED illuminating member according to the third embodiment, and is an enlarged cross-sectional view (7A) of a part X similar to FIG. An enlarged sectional view (7B) of FIG.

  In the light cover 30 constituting the LED illumination member 1 according to the third embodiment, the rubber member 33 is disposed only in the vicinity of the opening side of the front cover 40, and the rubber member 33 is not provided in other portions. In addition, it differs from the first embodiment in that the heat conductive layer 42 is formed to extend not only to the opening end face of the front cover 40 but also to the front outer peripheral portion 41. In part X, a space 50 is provided between the metal layer 32 and the reflective layer 34 instead of the rubber member 33. In the space 50, there is a layer with low thermal conductivity called air, so that heat transmitted through the metal layer 32 is difficult to transmit to the reflective layer 34. Further, the foam rubber layer 31 also has low thermal conductivity. The rubber member 33 is interposed between the metal layer 32 and the heat conductive layer 42 in the front outer peripheral portion 41 of the front cover 40. For this reason, the heat transmitted through the metal layer 32 is mainly transmitted to the rubber member 33 side preferentially over the foamed rubber layer 31 as indicated by the route Q, and then to the wire 43 via the heat conductive layer 42. And promptly communicate.

4). Fourth Embodiment Next, a fourth embodiment of the LED illumination member of the present invention will be described. In this embodiment, portions common to the first to third embodiments are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 8: shows the expanded sectional view of the part X similar to FIG. 4 in the light cover which comprises the LED lighting member which concerns on 4th Embodiment.

  The light cover 30 constituting the LED illumination member 1 according to the fourth embodiment is a cover in which a foam rubber layer 31 and a metal layer 32 are laminated in this order from the outside in the thickness direction to the inside. No other layer is provided on the inner side than 32. However, the heat conductive layer 42 interposed between the metal layer 32 and the front cover 40 may be provided only on the front outer peripheral portion 41 of the front cover 40. The metal layer 32 has a higher thermal conductivity than the foamed rubber layer 31 on the outer side and the air on the inner side. For this reason, the heat from the LED 15 is not easily transmitted from the sleeve 11 through the metal layer 32 to the outer side and the inner side in the thickness direction of the metal layer 32, and is transmitted to the wire 43 through the heat conductive layer 42.

5). Fifth Embodiment Next, a fifth embodiment of the LED illumination member of the present invention will be described. In this embodiment, portions common to the first to fourth embodiments are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 9 is an assembled perspective view of a part of the LED illumination member according to the fifth embodiment.

  The LED illumination member 1 according to the fifth embodiment is preferably used for a traffic light. This LED illuminating member 1 is different from the light valve 10 in each of the above-described embodiments in the form of the light valve 10a, and has a form in which a plurality of LEDs 15 are provided on the plate-like substrate 59. The light valve 10 a includes a sleeve 11 below the plate-like substrate 59 and a socket member 20 below the sleeve 11. The plate-like substrate 59 is made of a material having excellent heat conductivity because it is necessary to improve heat dissipation like the sleeve 11. A light cover 30 comprising a foamed rubber layer 31, a frame-shaped metal layer 32 molded in the form of an umbrella, a rubber member 33, and a reflective layer 34 has a through hole formed at the bottom of each cup-shaped layer. The through-hole 30a formed by 31a, 32a, 33a, 34a is provided. The light valve 10a is connected to the light cover 30 at a portion of the sleeve 11 with the sleeve 11 inserted into the through hole 30a. The plate-like substrate 59 may or may not be brought into contact with the reflective layer 34 on the outer surface. When the outer surface of the plate-like substrate 59 is in contact with the reflective layer 34, the heat from the LED 15 is transferred from the plate-like substrate 59 to the sleeve 11 and the reflective layer 34, and from there to the metal layer 32. When the outer surface of the plate substrate 59 does not contact the reflective layer 34, the heat from the LED 15 is transferred from the plate substrate 59 to the sleeve 11 and then to the metal layer 32.

  When the light cover 30 is composed of the foamed rubber layer 31 and the metal layer 32, if the LED illumination member 1 is configured so that the outer surface of the plate-like substrate 59 is in contact with the metal layer 32, the heat from the LED 15 is This is mainly transmitted to the plate-like substrate 59, the metal layer 32, the heat conductive layer 42, the wire 43, and the front cover 40. Moreover, it is preferable that the inside of the metal layer 32 is mirror-finished.

5). Other Embodiments Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be implemented with various modifications.

  The wire 43 is not embedded in the front cover 40, but is a surface of the front cover 40, that is, a back surface (concave surface in the first embodiment) or a front surface (convex surface in the first embodiment). May be formed. When the wire 43 is provided on the front cover 40 in a lattice shape, the vertical wire 43 and the horizontal wire 43 may or may not be in contact. It is not always necessary to provide the heat conductive layer 42, and the end surface of the wire 43 may be brought into contact with the metal layer 32, the rubber member 33, or the reflective layer 34.

  The sleeve 11 of the light valve 10 and the metal layer 32 of the light cover 30 are connected via the rubber member 33 as shown in FIG. 3, but may be in direct contact. In particular, when the rubber member 33 is not provided, or when the rubber member 33 is provided only in the vicinity of the front cover 40, the metal layer 32 and the sleeve 11 can be brought into direct contact. Such a structure is the same in other embodiments.

  Although it is not preferable to provide a space leading to the outside between the foam rubber layer 31 and the metal layer 32, it may be present as long as it is a closed space existing inside the layer of the light cover 30. The same applies to the space between the metal layer 32 and the rubber member 33.

  The present invention can be used for illumination members such as automobiles, traffic lights, and street lamps.

1 LED illumination member 10, 10a Light valve 15 LED (light emitting diode)
30 Light cover 31 Foam rubber layer 32 Metal layer 33 Rubber member 34 Reflective layer 37 Rubber layer 40 Front cover 42 Thermal conduction layer 43 Wire

Claims (8)

A light valve carrying one or more light emitting diodes;
A light cover that contacts a part of the light bulb and covers an outer periphery of a part of the light bulb and opens in an illumination direction;
A translucent front cover covering the opening of the light cover;
With
The light cover includes at least a metal layer,
An LED illuminating member comprising one or a plurality of wires that transmit heat from the metal layer to the surface or the inside of the front cover and have higher thermal conductivity than the front cover.   The LED illumination member according to claim 1, wherein the wires are provided in a lattice shape in a plan view of the front cover.   The LED illumination member according to claim 1, wherein the wire is mainly made of aluminum, copper, or an alloy containing at least one of them.   The LED light-emitting member according to any one of claims 1 to 3, wherein the light cover further includes a foamed rubber layer outside the metal layer.   The LED light-emitting member according to claim 4, wherein the foamed rubber layer is made of foamed silicone rubber.   The LED illumination member according to any one of claims 1 to 5, wherein the metal layer is mainly made of aluminum, copper, or an alloy containing at least one of them.   The LED illumination member according to claim 4 or 5, wherein the metal layer is in contact with the wire with a rubber member having higher thermal conductivity than the foamed rubber layer interposed therebetween.   The LED illumination member according to claim 7, wherein the rubber member is made of silicone rubber.