JP6245095B2 - Light emitting device - Google Patents

Description

  The present invention relates to a light emitting device including a light source, a control circuit unit, and a metal member to which the light source and the control circuit unit are fixed.

  Conventionally, as described in Patent Literature 1, a light emitting module including a light emitting element, a control circuit board, a metal member, and an attachment is known. The control circuit board controls lighting of the light emitting element.

  The light emitting module includes a first heat sink and a second heat sink as metal members. The light emitting element is fixed to the first heat sink, and the control circuit board is fixed to the second heat sink. The first heat sink dissipates heat generated by the light emitting element, and the second heat sink dissipates heat generated by the control circuit board. The first heat sink and the second heat sink are fixed to each other via an attachment. Thereby, a light emitting element, a control circuit board, a 1st heat sink, and a 2nd heat sink can be united, and a light emitting module can be reduced in size.

  The second heat sink is attached to the attachment so as not to contact the first heat sink. The attachment is formed using a material having a lower thermal conductivity than the first heat sink and the second heat sink. For this reason, the attachment functions as a heat separation member that separates heat generated by the light emitting element and heat generated by the control circuit board from each other.

JP 2014-16261 A

  However, in the said structure, an attachment must be used as a thermal separation member, and cost starts. Even if the thermal conductivity of the attachment is lower than that of the first heat sink and the second heat sink, the heat generated by the light emitting element is transferred to the second heat sink. According to this, the light emitting element and the control circuit board cannot be sufficiently thermally separated, and the heat generated by the light emitting element may be transferred to the control circuit board.

  In view of the above problems, an object of the present invention is to provide a light-emitting device capable of thermally separating the light source and the control circuit unit more effectively while reducing the cost and reducing the size. .

  The invention disclosed herein employs the following technical means to achieve the above object. Note that the reference numerals in the claims and the parentheses described in this section indicate the correspondence with the specific means described in the following embodiment as one aspect, and limit the technical scope of the invention. Not what you want.

One of the disclosed inventions is a light source (20), a control circuit unit (70) for controlling driving of the light source, a first metal member (130) to which the light source and the control circuit unit are fixed, a control circuit unit, In the direction orthogonal to the one surface (72a) that is interposed between the first metal member and faces the first metal member in the control circuit unit, the control circuit unit is supported at a position away from the first metal member, A spacer ( 114 ) formed using a material having a lower thermal conductivity than the first metal member, and the control circuit unit is fixed to the first metal member via the spacer. An air layer (200) is formed between the control circuit unit and the first metal member, and a second metal member (thermally connected to a part different from the fixed part of the control circuit unit to the first metal member) 90), in the second metal member Facing surface (90a) opposite to the surface of the control circuit section (90b) is characterized in that it is black.

  According to this, the light source and the control circuit unit are fixed to the first metal member. Therefore, the light source, the control circuit unit, and the first metal member can be integrated, and the light emitting device can be reduced in size.

  Moreover, in the said structure, the spacer interposed between the control circuit part and the 1st metal member is formed using the material whose heat conductivity is lower than a 1st metal member. Further, an air layer is formed between the control circuit portion and the first metal member by the spacer. The air layer is excellent in heat insulation. Therefore, the light source and the control circuit unit can be more effectively thermally separated, and the heat of the light source can be suppressed from being transferred from the first metal member to the control circuit unit.

  Moreover, in the said structure, in order to isolate | separate a light source and a control circuit part thermally, an air layer is used. Therefore, it is not necessary to use a member such as an attachment, and the cost can be suppressed.

It is a side view which shows schematic structure of the light-emitting device which concerns on 1st Embodiment. It is a top view which shows arrangement | positioning of a light source and a cover part. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line | wire of FIG. It is an expanded sectional view which shows the connection structure of a light source, a wire, and a control circuit part. It is a top view which shows arrangement | positioning of the main-body part and protrusion part in a heat sink. It is an expanded sectional view of the light-emitting device concerning a 2nd embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, common or related elements are given the same reference numerals. Further, the projecting direction of the projecting portion is indicated as the Z direction, the specific direction orthogonal to the Z direction is indicated as the X direction, and the direction orthogonal to the Z direction and the X direction is indicated as the Y direction. A shape along the XY plane is referred to as a planar shape.

(First embodiment)
First, a schematic configuration of the light emitting device 10 will be described with reference to FIGS.

  As shown in FIGS. 1 to 4, the light emitting device 10 includes a light source 20, a reflector 30, a lens 40, a housing 50, a wiring 60, a control circuit unit 70, a wire 80, a lid 90, a case 100, and a heat sink 130. ing. The light emitting device 10 is a device that irradiates light to an irradiation region. In the present embodiment, the light emitting device 10 irradiates light in one of the X directions. The white arrow in FIG. 1 indicates the light irradiation direction. Hereinafter, among the X directions, the direction in which the light emitting device 10 emits light is referred to as the front. As the light emitting device 10, for example, a vehicle headlamp can be used.

  The light source 20 includes a light emitting element 22 and a light emitting element substrate 24. As the light emitting element 22, for example, an LED can be adopted. The light emitting element 22 is mounted on the light emitting element substrate 24 and emits light in the Z direction and in the opposite direction to the light emitting element substrate 24. Hereinafter, in the Z direction, the light emitting direction of the light emitting element 22 is indicated as upward. In the present embodiment, as shown in FIG. 2, the four light emitting elements 22 are mounted in a line on the same surface of the light emitting element substrate 24. A reflector 30 is disposed above the light source 20.

  The reflector 30 is an optical member that reflects light from the light source 20. The reflector 30 is formed so that the reflection surface facing the light emitting element 22 has a curved shape that is recessed in a direction away from the light source 20. The reflector 30 reflects the light of the light source 20 toward the lens 40 disposed in front.

  The lens 40 is an optical member that projects the light reflected by the reflector 30 onto an irradiation area where the light emitting device 10 emits light. The lens 40 is a plano-convex lens in which the rear-side incident surface is a plane along the YZ plane and the front-side emission surface is a curved surface protruding forward. The light emitted from the lens 40 is transmitted through the housing 50 and projected onto the irradiation area.

  The housing 50 constitutes an outline of the light emitting device 10 and houses other members therein. The housing 50 is formed using, for example, a resin. The housing 50 includes a translucent part 52 disposed at the front and a main body part 54 disposed at the rear. The light transmitting part 52 and the main body part 54 are fixed to each other by fitting.

  The translucent part 52 is transparent so that the light condensed by the lens 40 can be transmitted. Thereby, the light-emitting device 10 can irradiate the irradiation region with light. The main body 54 has a connection portion (not shown) that is electrically connected to the connector of the wiring 60. The connection part of the main body part 54 is electrically connected to an external device such as a battery.

  The wiring 60 has a harness and connectors formed at both ends of the harness. The wiring 60 is a connector formed at the end opposite to the connector connected to the housing 50, and is electrically connected to the control circuit board 72 of the control circuit unit 70.

  The control circuit unit 70 includes a control circuit board 72 and an electronic component 74 and controls driving of the light source 20. As shown in FIGS. 3 and 4, the control circuit board is formed along the XY plane, and an electronic component 74 is mounted on the lower surface 72 a opposite to the upper side. The control circuit board 72 corresponds to the board described in the claims, and the one surface 72a corresponds to the facing surface described in the claims. As the control circuit board 72, for example, a printed board can be adopted. As the electronic component 74, for example, a transistor, a diode, a capacitor, a microcomputer, or the like can be employed.

  A through hole 76 is formed along the Z direction at the center of the control circuit board 72 in the XY plane. The planar shape of the through hole 76 is rectangular, and the planar shape of the outer peripheral end of the control circuit board 72 is rectangular.

  In addition, a connector (not shown) is mounted on the control circuit board 72. By connecting the connector of the control circuit board 72 to the connector of the wiring 60, the control circuit unit 70 is electrically connected to an external device via the wiring 60.

  As shown in FIG. 5, the control circuit unit 70 is electrically connected to the light source 20 via a wire 80. One end 82 of the wire 80 is joined to the back surface 72b opposite to the one surface 72a.

  The wire 80 is a wiring member that electrically connects the light source 20 and the control circuit unit 70 and is provided so as to be elastically deformable in the Z direction. The wire 80 corresponds to the wiring member described in the claims. The other end 84 of the wire 80 opposite to the one end 82 is in pressure contact with the light emitting element substrate 24 by the elastic deformation restoring force. Thereby, the wire 80 electrically connects the light source 20 and the control circuit unit 70. In the present embodiment, the light emitting device 10 includes two wires 80.

  The lid 90 is a heat radiating member that is formed using a metal material and radiates heat from the control circuit 70. The lid 90 corresponds to the second metal member described in the claims. The lid 90 is disposed above the control circuit board 72 and is in contact with the control circuit board 72. Specifically, the lid 90 has a plate-like shape and has a convex portion 92 that protrudes downward, and the tip end surface 92a of the convex portion 92 is in contact with the back surface 72b. Thereby, the control circuit part 70 and the cover part 90 are thermally connected. Also, the cover 90 has a black back surface 90b opposite to the surface 90a facing the control circuit board 72, and dissipates heat from the control circuit unit 70 to the outside from the back surface 90b side.

  Of the opposing surface 90a, only the front end surface 92a is in contact with the back surface 72b. The portion in contact with the lid 90 on the back surface 72b is a portion formed using an insulating material. Therefore, the control circuit board 72 and the lid 90 are not electrically connected.

  A through hole 94 is formed along the Z direction at the center of the lid 90 in the XY plane. The planar shape of the outer peripheral end of the lid 90 is a rectangular shape. The planar shape of the through hole 94 is a shape in which a portion through which the wire 80 passes is expanded with respect to the through hole 76 of the control circuit board 72. In FIG. 2, in the through-hole 94, the 1st wall surface 94a which follows the planar shape of the through-hole 76, and the 2nd wall surface 94b in which the part which the wire 80 passes are expanded are shown. Thereby, it is suppressed that the cover part 90 and the wire 80 contact.

  The lid 90 has a first fitting portion 96 for fitting with the case 100. The first fitting portion 96 protrudes from the side surface of the convex portion 92 toward the inner wall portion 104 or the outer wall portion 106 of the case 100 in the X direction or the Y direction.

  The case 100 protects the control circuit unit 70 and supports the control circuit unit 70 at a position away from the heat sink 130. The case 100 is formed using a material having a lower thermal conductivity than the heat sink 130, and is formed using, for example, a resin. The case 100 corresponds to the spacer described in the claims.

  The case 100 has a bottom portion 102, an inner wall portion 104, and an outer wall portion 106, and forms an internal space together with the lid portion 90. The bottom portion 102 is formed along the XY plane, has substantially the same planar shape as the lid portion 90, and has a through hole 108 at the center. The inner wall portion 104 extends upward from the inner peripheral end of the bottom portion 102. The outer wall portion 106 extends upward from the outer peripheral end of the bottom portion 102.

  A control circuit unit 70 is accommodated in an internal space formed by the case 100 and the lid 90. Therefore, the case 100 and the lid 90 function as a protective member that protects the control circuit unit 70. The case 100 is provided with a hole (not shown) for connecting the connector of the wiring 60 and the connector of the control circuit unit 70.

  The inner wall portion 104 and the outer wall portion 106 have a second fitting portion 110 that is recessed corresponding to the first fitting portion 96. The lid 90 is fixed to the case 100 by fitting the first fitting portion 96 and the second fitting portion 110 together. As shown below, the lid 90 and the case 100 are also fixed by fastening with screws 112.

  The bottom part 102 has a spacer part 114. The spacer unit 114 is interposed between the control circuit unit 70 and the heat sink 130 and supports the control circuit unit 70 at a position away from the heat sink 130 in the Z direction. In the XY plane, the spacer portions 114 are formed at the outer peripheral end and the inner peripheral end of the bottom portion 102. Specifically, the spacer portion 114 is formed at four locations at the outer peripheral end and at two locations at the inner peripheral end so as to surround the light source 20.

  The spacer part 114 has a thick part 116 and a protruding part 118. The thick portion 116 is thicker in the Z direction so as to protrude upward than the other portions of the bottom portion 102, and is formed integrally with the inner wall portion 104 or the outer wall portion 106. Of the surface 102a facing the control circuit board 72 in the bottom portion 102, only the upper end surface 116a in the thick portion 116 is in contact with the one surface 72a. Moreover, the thick part 116 and the convex part 92 are formed in substantially the same location on the XY plane.

  The lid 90, the control circuit board 72, and the case 100 are fastened with screws 112 where the convex portions 92 and the thick portions 116 are formed on the XY plane. When screws are fastened, the positions of the control circuit board 72 and the lid 90 in the Z direction are determined by contacting the back surface 72b and the front end surface 92a.

  Further, when the screws are fastened, the positions of the control circuit board 72 and the case 100 in the Z direction are determined by contacting the one surface 72a and the front end surface 116a. Further, the thick portion 116 forms a space in which the electronic component 74 is disposed between the bottom portion 102 and the control circuit board 72.

  The protruding portion 118 is formed so as to protrude downward from the thick portion 116. Of the back surface 102 b opposite to the facing surface 102 a at the bottom 102, only the tip surface 118 a of the protrusion 118 is in contact with the heat sink 130. An air layer 200 is formed between the case 100 and the heat sink 130 by contacting only the front end surface 118 a of the back surface 102 b with the heat sink 130. Note that the ratio of the front end surface 118a to the back surface 102b is very small, and the air layer 200 is much larger than the protrusion 118 in the XY plane. The bottom 102 is fastened to the main body 132 of the heat sink 130 in the Z direction by a screw 120 at a position different from the spacer 114.

  The heat sink 130 is a heat radiating member that is formed using a metal material and radiates heat from the light source 20. The light source 20 and the control circuit unit 70 are fixed to the heat sink 130. The heat sink 130 corresponds to the first metal member recited in the claims.

  The heat sink 130 is disposed below the light source 20, the control circuit unit 70, and the case 100. The light source 20 and the control circuit unit 70 are fixed to a fixed surface on the upper side of the heat sink 130.

  The heat sink 130 has a main body portion 132 and a protruding portion 134. The protruding portion 134 is formed to protrude upward from the main body portion 132. As shown in FIG. 6, the surface 132 a of the main body 132 out of the fixed surface of the heat sink 130 is formed in an annular shape so as to surround the protrusion 134. Moreover, the protrusion part 134 is formed in the center in the surface 132a. Specifically, the heat sink 130 is formed so that the center of the surface 132a and the front end surface 134a of the protruding portion 134 substantially coincide with each other on the XY plane.

  The case 100 is disposed on the surface 132a, and the bottom portion 102 and the main body portion 132 are screwed together. Therefore, the control circuit unit 70 is fixed to the main body unit 132 through the case 100. The planar shape of the outer peripheral end of the surface 132a is a rectangular shape.

  Further, the light source 20 is fixed to the distal end surface 134a. Specifically, the light emitting element substrate 24 is fixed to the distal end surface 134a via an adhesive having high thermal conductivity. The distal end surface 134a corresponds to the distal end surface described in the claims. In addition, the planar shape of the protrusion 134 is a rectangular shape and is substantially the same shape as the light emitting element substrate 24.

  The protrusion 134 is inserted through the center of the through hole 108 and the through hole 76 in the Z direction. Therefore, the light source 20 is disposed above the back surface 72b. Thereby, in the Z direction, the entire control circuit unit 70 is disposed in a region between the surface 132a and the tip surface 134a. Furthermore, the protrusion part 134 has penetrated the center of the through-hole 94 in the Z direction. Therefore, the light source 20 is disposed above the back surface 90b. Thus, in the Z direction, the lid 90, the control circuit unit 70, and the case 100 as a whole are arranged in the region between the surface 132a and the tip surface 134a.

  As an example of a procedure for assembling the light emitting device 10, first, the case 100 is fixed to the heat sink 130 by screw fastening. Next, the control circuit unit 70 to which the wire 80 is connected is disposed in the case 100, and the case 100 and the lid 90 are fixed by fitting. Then, the case 100, the control circuit unit 70, and the lid 90 are fixed by screw fastening so as to be integrated. Next, it fixes so that the other end part 84 of the wire 80 may not contact the light source 20, and the light source 20 is fixed to the heat sink 130 with an adhesive material. Next, the light source 20 and the control circuit unit 70 are connected via the wire 80 by pressing the other end 84 against the light emitting element substrate 24.

  Next, the effect of the light emitting device 10 will be described.

  According to this embodiment, the light source 20 and the control circuit unit 70 are fixed to the heat sink 130. Therefore, the light source 20, the control circuit unit 70, and the heat sink 130 can be integrated, and the light emitting device 10 can be downsized.

  A case 100 interposed between the control circuit unit 70 and the heat sink 130 is formed using a material having a lower thermal conductivity than the heat sink 130. Further, an air layer 200 is formed between the control circuit unit 70 and the heat sink 130 by the spacer portion 114 of the case 100. The air layer 200 is excellent in heat insulation. Therefore, the light source 20 and the control circuit unit 70 can be separated more effectively, and the heat of the light source 20 can be suppressed from being transferred from the heat sink 130 to the control circuit unit 70.

  In the present embodiment, the air layer 200 is used to thermally separate the light source 20 and the control circuit unit 70. Therefore, it is not necessary to use a member such as an attachment, and the cost can be suppressed.

  Generally, in order to electrically connect the light source 20 and the wire 80, a mounting technique such as wire bonding is required. In the present embodiment, the wire 80 is electrically connected to the light source 20 by pressure contact using elastic deformation restoring force. According to this, the wire 80 and the light source 20 can be electrically connected with a simple configuration. Therefore, for example, even when the light source 20 and the control circuit unit 70 and the wire 80 bonded to the control circuit unit 70 are purchased separately, the light source 20 and the wire 80 are electrically connected with a simple configuration. Can be connected.

  If the control circuit unit 70 is disposed above the front end surface 134 a in the Z direction, the light from the light source 20 may be blocked by the control circuit unit 70. In the present embodiment, in the Z direction, the entire control circuit unit 70 is disposed in a region between the surface 132a and the tip surface 134a. According to this, it is possible to suppress the light from the light source 20 from being blocked by the control circuit unit 70.

  In the Z direction, the longer the longest distance from the projecting portion 134 to the outer peripheral end of the surface 132a, the less the heat of the light source 20 is transferred to the entire main body 132. Therefore, for example, when the protruding portion 134 is arranged to be biased with respect to the center of the surface 132a, the heat of the light source 20 is not easily transferred to the entire main body 132, and the heat dissipation of the light source 20 by the heat sink 130 may be reduced. is there.

  In the present embodiment, the surface 132 a is formed in an annular shape so as to surround the protruding portion 134. According to this, the longest distance from the protrusion part 134 in the Z direction to the outer periphery end of the surface 132a can be shortened compared with the structure in which the protrusion part 134 is formed over the outer periphery end of the surface 132a. Therefore, the heat of the light source 20 is easily transferred to the entire main body 132, and the heat dissipation of the light source 20 by the heat sink 130 can be suppressed from decreasing.

  In the present embodiment, the protrusion 134 is formed at the center of the surface 132a. According to this, the longest distance between the protruding portion 134 and the outer peripheral end of the surface 132a in the Z direction can be shortened compared to a configuration in which the protruding portion 134 is formed at a position away from the center of the surface 132a. Therefore, it can suppress that the heat dissipation of the light source 20 by the heat sink 130 falls.

  An air layer 200 is formed between the control circuit unit 70 and the heat sink 130, and heat transfer from the control circuit unit 70 to the heat sink 130 is suppressed. Therefore, the heat of the control circuit unit 70 is not dissipated, and the temperature of the control circuit unit 70 may increase.

  In the present embodiment, the lid portion 90 is formed using a metal material and is thermally connected to the control circuit portion 70. Therefore, heat is easily transferred from the control circuit unit 70 to the lid 90. Furthermore, since the back surface 90b of the lid 90 is black, heat is easily radiated from the lid 90 to the outside. Therefore, it is possible to suppress the temperature of the control circuit unit 70 from rising.

(Second Embodiment)
In the present embodiment, description of portions common to the light emitting device 10 shown in the first embodiment is omitted.

  As shown in FIG. 7, the control circuit unit 70 includes, as electronic components 74, a low-profile component 74a having a low height in the Z direction and a high-profile component 74b that is higher in the Z direction than the low profile component 74a. For example, a capacitor can be used as the high-profile component 74b.

  The bottom portion 102 of the case 100 has a through hole 122 formed corresponding to the high-profile component 74b. The main body 132 of the heat sink 130 has a bottomed hole 136 at a portion facing the high-profile component 74b. A part of the high-profile part 74 b is inserted and disposed in the bottomed hole 136. The bottomed hole 136 corresponds to the hole described in the claims. Since the tall part 74b is inserted and disposed in the bottomed hole 136, the length L1 from the front surface 132a to the back surface 72b is shortened as compared with the first embodiment.

  Also in this embodiment, the front end surface 134a is disposed above the back surface 72b in the Z direction. Therefore, in the Z direction, the length from the surface 132a to the tip end surface 134a, that is, the protruding length L2 of the protruding portion 134 is longer than the length L1. In the present embodiment, the protruding length L2 is longer than the length L3 from the front surface 132a to the back surface 90b.

  When the protrusion length L2 becomes longer, the heat transfer path from the light source 20 to the main body 132 becomes longer, so that the heat of the light source 20 is hardly transferred to the main body 132. If the heat of the light source 20 is not sufficiently transferred to the main body 132, the heat dissipation of the light source 20 by the heat sink 130 may be reduced.

  In the present embodiment, a part of the tall component 74 b is inserted and disposed in the bottomed hole 136 of the heat sink 130. Thereby, compared with the structure in which the heat sink 130 does not have the bottomed hole 136, the length L2 from the front surface 132a to the back surface 72b can be shortened. Therefore, the protrusion length L1 of the protrusion part 134 can be shortened, and it can suppress that the heat dissipation of the light source 20 by the heat sink 130 falls.

  In the present embodiment, an example in which the main body 132 has the bottomed hole 136 is shown, but the present invention is not limited to this. The main body 132 may have a through hole, and the electronic component 74 may be inserted and disposed in the through hole.

  Further, in the present embodiment, an example in which only the tall component 74b is inserted and disposed in the bottomed hole 136 is shown, but the present invention is not limited to this. All the electronic components 74 mounted on the one surface 72a may be inserted into the bottomed hole 136.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the above-described embodiment, an example in which the light emitting device 10 includes the light source 20, the reflector 30, the lens 40, the housing 50, the wiring 60, the control circuit unit 70, the wire 80, the lid 90, the case 100, and the heat sink 130 has been described. However, the present invention is not limited to this. The light emitting device 10 can be adopted as long as it includes at least the light source 20, the control circuit unit 70, the heat sink 130, and the spacer. In addition, although the example in which the case 100 has the spacer part 114 was shown, it is not limited to this. An example in which the light emitting device 10 includes a spacer alone without including the case 100 may be employed.

  Moreover, although the cover part 90, the control circuit board 72, and the case 100 were screw-fastened so that it might become integral in the said embodiment, it is not limited to this. For example, the control circuit board 72 and the case 100 may be screwed together, and the lid 90 may be fixed to the case 100 by fitting.

  Moreover, although the heat sink 130 showed the example which has the main-body part 132 and the protrusion part 134 in the said embodiment, it is not limited to this. The heat sink 130 can be employed as long as the light source 20 and the control circuit unit 70 are fixed. Moreover, although the example which makes the planar shape of the main-body part 132 and the protrusion part 134 rectangular is shown, it is not limited to this. For example, an example in which the planar shape is a circular shape may be employed.

  In the above embodiment, the example in which the electronic component 74 is mounted only on the one surface 72a has been described, but the present invention is not limited to this. An example in which the electronic component 74 is mounted on the back surface 72b or both surfaces 72a and 72b can also be adopted.

DESCRIPTION OF SYMBOLS 10 ... Light-emitting device, 20 ... Light source, 22 ... Light-emitting element, 24 ... Light-emitting-element board | substrate, 30 ... Reflector, 40 ... Lens, 50 ... Case, 52 ... Translucent part, 54 ... Main-body part, 60 ... Wiring, 70 ... Control circuit part 72 ... Control circuit board 74 ... Electronic component 74a ... Low profile part 74b ... High profile part 76 ... Through hole 80 ... Wire 82 ... One end part 84 ... Other end part 90 ... Lid Part, 92 ... convex part, 94 ... through hole, 96 ... first fitting part, 100 ... case, 102 ... bottom part, 104 ... inner wall part, 106 ... outer wall part, 108 ... through hole, 110 ... second fitting part , 112 ... Screw, 114 ... Spacer part, 116 ... Thick part, 118 ... Projection part, 120 ... Screw, 122 ... Through hole, 130 ... Heat sink, 132 ... Body part, 134 ... Projection part, 136 ... Bottomed hole, 200 ... Air layer

Claims (6)

A light source (20);
A control circuit unit (70) for controlling driving of the light source;
A first metal member (130) to which the light source and the control circuit unit are fixed;
The control circuit portion is interposed between the control circuit portion and the first metal member, and the control circuit portion is disposed in the direction perpendicular to the one surface (72a) facing the first metal member in the control circuit portion. A spacer ( 114 ) that is supported using a material having a lower thermal conductivity than that of the first metal member, and is supported at a position away from the member.
The control circuit unit is fixed to the first metal member via the spacer,
An air layer (200) is formed between the control circuit unit and the first metal member by the spacer ,
A second metal member (90) thermally connected to a part different from the fixed part to the first metal member in the control circuit unit;
The light emitting device according to claim 1, wherein a surface (90b) opposite to the surface (90a) facing the control circuit portion in the second metal member is black . A wiring member (80) for electrically connecting the light source and the control circuit unit;
The light source and the control circuit unit are fixed to the same surface of the first metal member,
The wiring member is provided so as to be elastically deformable in a direction perpendicular to the one surface, and is electrically connected to the control circuit portion by bonding, and is electrically connected to the light source by pressure contact due to elastic deformation restoring force. The light emitting device according to claim 1, wherein the light emitting device is connected. The first metal member has a main body portion (132) and a protruding portion (134) protruding from the main body portion,
Of the surface of the first metal member to which the light source and the control circuit unit are fixed, the light source is fixed to the tip end surface (134a) portion of the protruding portion, and the control is performed to the surface (132a) portion of the main body portion. The circuit part is fixed,
The whole of the control circuit unit is disposed in a region between the surface of the main body unit and the tip end surface of the projecting unit in the projecting direction of the projecting unit. Light-emitting device. Wherein the control circuit section includes a substrate (72) constituting the one side, an electronic component which is at least mounted on the one surface of the substrate (74), a
The main body portion of the first metal member has a hole (136) in a portion facing the electronic component,
The light emitting device according to claim 3, wherein a part of the electronic component is inserted and disposed in the hole.   The light emitting device according to claim 3, wherein the surface of the main body is formed in an annular shape so as to surround the protruding portion.   The light emitting device according to claim 5, wherein the protrusion is formed at a center of the surface of the main body.

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