JP2006310515A - Light emitting unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high output light emitting unit exhibiting high heat dissipation effect in which the size and weight can be reduced. <P>SOLUTION: A plurality of substrates each mounting a plurality of light emitting diodes connected with substrate electrodes through a bonding wire and covered with translucent resin are prepared. High density packaging is performed by arranging the plurality of substrates on respective side faces of a prismatic supporting material. The prismatic supporting material is provided with grooves or holes for performing high efficiency cooling by injecting cooling refrigerant of liquid or gas. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light-emitting unit that uses a plurality of light-emitting diodes as light sources and is used for high-power applications such as illumination, and particularly relates to a light-emitting unit having excellent heat dissipation.

  Since the brightness of light emitting diodes has been improved, signal lights and lighting equipment using light emitting diodes have been used. As an example of such a prior art, a fluorescent lamp type LED lamp is disclosed in which a plurality of light emitting diodes are attached to a ready-made fluorescent lamp luminaire instead of the fluorescent lamp (see, for example, Patent Document 1). Such a light-emitting unit for high output needs to be driven (lighted) with a large current, so that the amount of heat generated by the light-emitting diode element increases almost in proportion to the drive current value, and the generated heat increases accordingly. On the other hand, the light emission efficiency (current-light conversion efficiency) of the light emitting diode element is higher as the temperature is lower, and the lifetime is longer as the temperature is lower. Therefore, in the case of using a plurality of light emitting diodes as a light source, an example of a signal lamp provided with a heat radiation fixing plate (heat sink) made of metal on the bottom surface of the substrate on which the light emitting diodes are arranged in order to dissipate the heat generated by the light emitting diode elements. Is disclosed. (For example, refer to Patent Document 2 and Patent Document 3.)

  A conventional example of a light emitting unit employing such a heat sink will be briefly described with reference to the drawings. As shown in FIG. 11, the light emitting unit in the conventional example has a heat sink 2 attached by adhesion or the like to a light emitter substrate 1 in which a plurality of light emitting diodes 1a arranged two-dimensionally are mounted on an aluminum substrate 1b. The heat sink 2 has heat radiating fins 2c, and the heat radiating fins 2c radiate heat generated from the plurality of light emitting diodes 1a.

Japanese Patent Laying-Open No. 2004-303614 (page 5-7, FIG. 1) JP 2002-299700 A (page 3-4, FIG. 1) JP 2002-43771 A (2nd page, FIG. 1)

  However, in recent years, the demand for brightness has increased, so the number of mounted elements and input power tend to increase, and the amount of heat generated is larger than before. The side to be done must be enlarged. For this reason, there is a problem that the size of the light emitting unit is increased and the weight is also increased, and there has been a demand for the realization of a light emitting unit for high power use that is reduced in size and weight.

(Object of invention)
Accordingly, an object of the present invention is to provide a light-emitting unit for high-power use that exhibits a high heat dissipation effect and can be reduced in size and weight.

  In order to achieve the above object, a light emitting unit of the present invention comprises a polygonal columnar support material and a plurality of light emitting diodes arranged on the side surface of the columnar support material, and the columnar support material is made of a liquid or a gas. A cooling groove or a cooling hole for injecting the medium is provided.

  The cooling groove is characterized by a groove having a depth formed in the center direction from the outer periphery of the columnar support member and a length formed along the longitudinal direction of the columnar support member.

  The cooling hole is formed along the longitudinal direction of the columnar support material, and the injection port and the outlet are holes formed on one end surface in the longitudinal direction of the columnar support material.

  The cooling hole is formed at a position corresponding to the side surface of the columnar support material.

  As described above, since the light emitting unit of the present invention directly cools the columnar support material on which the light emitting diode is mounted, a high heat dissipation effect can be obtained. As a result, the light emitting diode element can be kept at a low temperature even when the input power is increased, and the light emission efficiency (current-light conversion efficiency) of the light emitting diode element can be improved. In addition, deterioration of the light emitting diode element due to heat can be suppressed and the life can be extended. In addition, a large heat sink for heat dissipation is not required, and a light emitting unit for high power use that is reduced in size and weight as an instrument can be provided.

1 to 4 show a light emitting unit in Example 1 of the present invention, FIGS. 5 and 6 show a light emitting unit in Example 2, and FIGS. 7 and 8 show a light emitting unit in Example 3. FIG.
9 and 10 are diagrams showing the light emitting unit in Example 4. FIG. In the light emitting unit in this embodiment, a plurality of light emitting diodes are arranged on the side surface of a polygonal columnar support material, and cooling grooves or cooling holes for injecting a cooling medium made of liquid or gas into the columnar support material are provided. By providing and forcibly injecting and circulating a cooling medium, a high heat dissipation effect is exhibited. As a result, there is no need for a large heat sink for heat dissipation, and a light emitting unit for high power use that is reduced in size and weight can be provided. In the following description of the embodiments and drawings, the same reference numerals are given to the same components as those in the prior art, and duplicate descriptions are omitted. Hereinafter, specific examples of the present invention will be described with reference to the drawings.

  1 is a front view showing a light emitting unit in Example 1, FIG. 2 is a cross-sectional view taken along line AA of the light emitting unit in FIG. 1, FIG. 3 is a cross sectional view taken along line BB of the light emitting unit in FIG. It is sectional drawing which shows the light emitting diode arrange | positioned at the light emitting unit by the elements on larger scale of the A section. As shown in FIGS. 1, 2, and 3, the light-emitting units in the present embodiment are a hexagonal columnar support member 15 and a plurality of light emitting units arranged on each side surface corresponding to the hexagonal sides of the columnar support member 15. Light emitting diodes 11 (in this embodiment, twelve are arranged) and a terminal portion 16 provided at one end of each side surface of the columnar support member 15, and a cooling hole 19 is provided inside the columnar support member 15. Is formed.

  As shown in FIG. 4, the light emitting diode 11 has a cathode electrode 13 and an anode electrode 14 patterned on the upper surface of a substrate 12 with an insulating layer interposed therebetween. As the cathode electrode 13 and the anode electrode 14, a copper electrode plated with gold, silver, or aluminum is used. Further, the light emitting diode element 10 is mounted at the center of the upper surface of the substrate 12, and the back surface side thereof is fixed to the substrate 12 with an adhesive. The electrodes included in the light emitting diode element 10 are electrically connected to the cathode electrode 13 and the anode electrode 14 provided on the substrate 12 by bonding wires 17 made of gold wires. Further, a translucent sealing resin 18 that covers and protects the light emitting diode element 10 and the bonding wire 17 is formed on the surface side of the substrate 12.

  The terminal part 16 is formed with a cathode electrode 13 and an anode electrode 14 connected to the light emitting diode 11, and the terminal part 16 is a socket (not shown) provided on a mounting board (not shown) or the like. ) And can be detachably fitted.

  The columnar support member 15 is made of a metal material such as aluminum, and as shown in FIGS. 2 and 3, four cooling holes 19 for injecting a cooling medium made of water or air are provided therein. The cooling hole 19 is formed along the longitudinal direction of the columnar support member 15, and the injection port 19 a and the outlet 19 b are formed on one end surface in the longitudinal direction of the columnar support member 15, that is, the end surface 15 a on the terminal portion 16 side. Yes. The cooling hole 19 extends from the injection port 19a provided in one end surface 15a of the columnar support member 15 toward the other end surface along the longitudinal direction, and reverses the extending direction in the vicinity of the other end surface, thereby It extends to an outlet 19b provided in 15a, and is formed in a substantially U-shape. In addition, the inlets 19a of the four cooling holes 19 are arranged at substantially equal intervals along the outer periphery of the columnar support member 15, and the outlets 19b are respectively arranged on the inner side corresponding to the four inlets 19a. Yes. By forcibly injecting and circulating water or air from the inlet 19a, the heat generated from the light emitting diode element 10 can be efficiently dissipated.

  As described above, since the light emitting unit in this embodiment directly cools the columnar support member 15 on which the light emitting diode 11 is mounted, a high heat dissipation effect can be obtained. As a result, the light emitting diode element can be kept at a low temperature even when the input power is increased, and the light emission efficiency (current-light conversion efficiency) of the light emitting diode element can be improved. In addition, deterioration of the light emitting diode element due to heat can be suppressed and the life can be extended. In addition, a large heat sink for heat dissipation is not required, and a light emitting unit for high power use that is reduced in size and weight can be realized.

  FIG. 5 is a side view of the light emitting unit in Example 2 as viewed from one end face side. Although the example using the columnar support material having a hexagonal shape has been described in the first embodiment, the second embodiment describes an example in which the columnar support material has an octagonal shape and the cooling holes are arranged differently. The basic structure is the same as that of the first embodiment. As shown in FIG. 5, in the light emitting unit in Example 2, one cooling hole 21 is formed along the longitudinal direction of the columnar support member 25, and the injection port 21 a and the outlet 21 b are the longitudinal direction of the columnar support member 25. One is provided on each end face. The cooling hole 21 extends from the injection port 21a provided on one end surface of the columnar support member 25 toward the other end surface along the longitudinal direction, reverses the extending direction in the vicinity of the other end surface, and thus ends on one end surface 21a. It is extended to the exit 21b provided in and is formed in a substantially U-shaped shape. The inlet 21 a and the outlet 21 b are provided at positions facing the center of the columnar support member 25, and the inlet 21 a is disposed at a position corresponding to the side surface of the columnar support member 25.

  FIG. 6 is a side view seen from one end face side of the light emitting unit in another example of this embodiment. As shown in FIG. 6, in this light emitting unit, two cooling holes 22 are formed along the longitudinal direction of the columnar support member 25, and an inlet 22 a and an outlet 22 b of the cooling hole 22 are formed of the columnar support member 25. Two each are provided on one end face in the longitudinal direction. The inlet 22 a and the outlet 22 b are disposed at substantially equal intervals along the outer periphery of the columnar support member 25. Further, the two inlets 22 a are respectively disposed at positions corresponding to the side surfaces of the columnar support member 25 and are disposed at positions facing each other with respect to the center of the columnar support member 25. Further, the two outlets 22b are also arranged at positions facing each other like the two inlets 22a. In addition, the cooling hole 22 is formed in a substantially U shape like the cooling hole 21.

  Since the light emitting unit in this embodiment can increase the inner diameters of the cooling holes 21 and 22, it is possible to use a cooling medium having a relatively high viscosity. In addition, the same effect as in the first embodiment can be obtained in the light emitting unit in the second embodiment.

  FIG. 7 is a side view of the light emitting unit in Example 3 as viewed from one end face side. As shown in FIG. 7, the light emitting unit in Example 3 is an example in which eight cooling holes 23 are provided, and the cooling holes 23 are formed along the longitudinal direction of the columnar support member 25 as in Example 2. And is formed in a substantially U-shape. The inlets 23 a of the eight cooling holes 23 are disposed at substantially equal intervals along the outer periphery of the columnar support member 25, and are disposed at positions corresponding to the respective octagonal side surfaces of the columnar support member 25. . Moreover, the eight outlets 23b are each arrange | positioned inside corresponding to the eight injection ports 23a.

  FIG. 8 is a side view seen from one end face side of the light emitting unit in another example of this embodiment. As shown in FIG. 8, the cooling hole 24 of the light emitting unit is provided with eight inlets 24a and one outlet 24b. The eight inlets 24 a are arranged at the same position as the inlet 23 a in FIG. 7, and one outlet 24 b is provided in the vicinity of the approximate center of the columnar support member 25. This cooling hole 24 has eight holes extending from the eight inlets 24a provided on one end face of the columnar support member 25 along the longitudinal direction toward the other end face, and is provided in the vicinity of the other end face. It is gathered in the hole and reverses the extension direction, and extends to the outlet 24b provided on one end face. The inner diameter of one hole connected to one outlet 24b is set so that the sectional area of the hole is substantially equal to the sum of the sectional areas of the eight holes extending from the inlet 24a.

  In the light emitting unit in the present embodiment, the cooling holes 23 and 24 are disposed along the outer periphery of the columnar support member 25 and are disposed at positions corresponding to the respective sides of the octagonal shape. The heat generated from the light emitting diodes 11 disposed on each side surface can be efficiently radiated. In addition, the same effect as in the first embodiment can be obtained in the light emitting unit in the third embodiment.

  The cooling hole may be a through-hole penetrating from one end surface to the other end surface in the longitudinal direction of the columnar support member. In this case, the same effect can be obtained.

  FIG. 9 is a front view showing the light emitting unit in Example 4, and FIG. 10 is a cross-sectional view taken along the line C-C of the light emitting unit in FIG. As shown in FIGS. 9 and 10, the light emitting unit in this example is different from Example 1 in that a cooling groove 29 is provided in the hexagonal columnar support member 15 instead of the cooling hole. Others are the same as in the first embodiment.

  As shown in FIGS. 9 and 10, the columnar support member 15 is provided with six cooling grooves 29 for injecting air. The cooling groove 29 has a depth formed from the outer peripheral portion of the columnar support member 15 toward the center, and a length formed along the longitudinal direction of the columnar support member 15 over the entire length. The cooling groove 29 is provided between the hexagonal ridges of the columnar support member 15, that is, the light emitting diodes 11 provided on the side surfaces of the columnar support member 15 adjacent to each other. By forcibly injecting and circulating air into the cooling groove 29, the heat generated from the light emitting diode 11 can be radiated efficiently. Further, the light emitting unit in the present embodiment can obtain the same effects as those of the first embodiment. In addition, in the present Example, although demonstrated in the example which provided the six cooling grooves in each hexagonal ridgeline part of the columnar support material 15, it is not limited to this, It depends on the shape of the cooling columnar support material. Needless to say, the number of grooves and the positions to be arranged can be set freely.

  In each embodiment, the columnar support material has been described as an example of a hexagonal or octagonal shape, but the present invention is not limited to this, and other polygonal columnar supports such as a triangle, a quadrangle, and a decagon are used. Materials can be used.

  In each embodiment, the example of using water or air as the cooling medium has been described. However, the cooling medium is not limited to this, and a gas such as an inert gas or various cooling liquids is used. The same effect can be obtained.

It is a figure which shows the light emission unit in Example 1 of this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is the elements on larger scale of the A section in FIG. 2, and is sectional drawing which shows the light emitting diode arrange | positioned at the light emission unit. It is a side view which shows the light emission unit in Example 2 of this invention. It is a side view which shows the other example of the light emission unit in Example 2 of this invention. It is a side view which shows the light emission unit in Example 3 of this invention. It is a side view which shows the other example of the light emission unit in Example 3 of this invention. It is a front view which shows the light emission unit in Example 4 of this invention. It is CC sectional drawing in FIG. It is a figure which shows the light emission unit in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light emitting diode element 11 Light emitting diode 12 Board | substrate 13 Cathode electrode 14 Anode electrode 15, 25 Columnar support body 15a End surface 16 Terminal part 17 Bonding wire 18 Translucent sealing resin 19, 21, 22, 23, 24 Cooling hole 19a, 21a , 22a, 23a, 24a Inlet 19b, 21b, 22b, 23b, 24b Outlet 29 Cooling groove

Claims (4)

  It has a polygonal columnar support material and a plurality of light emitting diodes arranged on the side of the columnar support material, and the columnar support material has cooling grooves or cooling holes for injecting a cooling medium made of liquid or gas. A light emitting unit characterized by that.   The cooling groove is composed of a plurality of grooves having a depth formed from an outer peripheral portion of the columnar support member toward a center direction and a length formed along a longitudinal direction of the columnar support member. The light emitting unit according to claim 1.   2. The cooling hole is formed along a longitudinal direction of the columnar support member, and an inlet and an outlet are holes formed in one end surface of the columnar support member in the longitudinal direction. The light emitting unit described. The light emitting unit according to claim 3, wherein the cooling hole is formed at a position corresponding to a side surface of the columnar support member.

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