JP5894494B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp used in a vehicle such as an automobile.

  In Patent Document 1, a light-emitting diode is electrically connected, a flexible substrate to which a signal for on / off control of the light-emitting diode is supplied, a plate-like frame that supports the flexible substrate, and the flexible substrate are fixed to the frame An optical semiconductor illuminating device including a fixture having a clip function is disclosed.

JP 2006-128214 A

  In the lamp disclosed in Patent Document 1, heat radiation of the light emitting element is performed by a clip-shaped fixture. For this reason, there has been a problem that the heat dissipation performance tends to be insufficient when the amount of heat generated by the light emitting element increases. On the other hand, it is conceivable to improve heat dissipation by providing heat dissipation to the plate-like frame attached to the back side of the flexible printed circuit board. However, in this structure, it is necessary to secure an area of the frame that contributes to heat dissipation of each light emitting element. For this reason, the mounting pitch of the light emitting elements is increased, which may increase the size of the lamp.

  This invention is made | formed in view of such a subject, The objective is to provide the technique which improves the heat dissipation of a light emitting element, avoiding the enlargement of a lamp.

  In order to solve the above problems, an aspect of the present invention is a vehicular lamp. The vehicle lamp includes a flexible printed wiring board having a plurality of light emitting element mounting portions on one main surface, and a plurality of heat dissipation attached to the back side of each light emitting element mounting portion on the other main surface of the flexible printed wiring board. And a base member that supports the plurality of heat dissipating members, the heat dissipating member having a contact portion that contacts the flexible printed circuit board and an extending portion that extends rearward from the contact portion. It is characterized by that.

  According to this aspect, the heat dissipation of the light emitting element can be improved while avoiding the increase in size of the lamp.

  The said aspect WHEREIN: You may provide the 1st engagement mechanism which engages the said base member and the said extension part, and the 2nd engagement mechanism which engages the said base member and the said contact part. According to this, since it is not necessary to separately provide a fixing member for fixing the flexible printed wiring board to the base member, the number of parts can be reduced.

  In the above aspect, the first engagement mechanism may fit and fix the heat radiating member to the base member. Thereby, a heat radiating member and a flexible printed wiring board can be fixed to a base member more easily.

  In any one of the above aspects, in the plurality of light emitting element mounting portions, at least two adjacent light emitting element mounting portions may be displaced in the lamp front-rear direction. Since the flexible printed wiring board has flexibility, it can easily take such a shape.

  In any one of the above aspects, the heat dissipation member may be formed of a metal plate, and the contact portion and the extension portion may be formed by bending the metal plate. According to this, a heat radiating member can be formed more easily.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the heat dissipation of a light emitting element can be provided, avoiding the enlargement of a lamp.

It is a horizontal sectional view showing a schematic structure of a vehicular lamp according to an embodiment. It is a disassembled perspective view of the lamp unit which concerns on embodiment. FIG. 3A is a vertical sectional view showing a schematic structure in the vicinity of the light emitting element of the lamp unit. FIG. 3B is a cross-sectional view taken along line AA in FIG. FIG. 3C is a cross-sectional view taken along line BB in FIG. It is a perspective view which shows schematic structure of the light emitting element vicinity of a lamp unit.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a horizontal sectional view showing a schematic structure of a vehicular lamp according to an embodiment. The vehicular lamp 1 according to the present embodiment is a vehicular headlamp device having a pair of headlamp units arranged on the left and right sides in front of the vehicle. Since the pair of headlamp units have substantially the same configuration except that they have a symmetrical structure, FIG. 1 shows the structure of one headlamp unit as the vehicular lamp 1.

  The vehicular lamp 1 includes a lamp body 2 having an opening on the front side of the vehicle, and a translucent cover 4 attached so as to cover the opening of the lamp body 2. The translucent cover 4 is made of translucent resin or glass. A lamp unit 10 is accommodated in the lamp chamber 3 formed by the lamp body 2 and the translucent cover 4. In the lamp chamber 3, the lamp unit 10 is supported by the lamp body 2 via a bracket (not shown). An extension member 6 is arranged in front of the lamp unit 10 relative to the lamp unit 10. The extension member 6 has an opening 6 a for allowing the irradiation light from the lamp unit 10 to pass through, and is fixed to the lamp body 2.

  Next, the structure of the lamp unit 10 will be described in detail with reference to FIGS. FIG. 2 is an exploded perspective view of the lamp unit according to the embodiment. FIG. 3A is a vertical sectional view showing a schematic structure in the vicinity of the light emitting element of the lamp unit. FIG. 3B is a cross-sectional view taken along line AA in FIG. FIG. 3C is a cross-sectional view taken along line BB in FIG. FIG. 4 is a perspective view showing a schematic structure in the vicinity of the light emitting element of the lamp unit. 3A to 4 show a state before a projection 66 described later is caulked. In FIG. 4, the illustration of the inner lens 80 is omitted.

  The lamp unit 10 includes a flexible printed wiring board 20, a plurality of heat radiating members 40, a base member 60, and an inner lens 80 as main components.

  The flexible printed wiring board 20 has a plurality of light emitting element mounting portions 22 (see FIG. 3A) on the main surface (one main surface) on the front side of the lamp. Further, a wiring pattern (not shown) for supplying power to the light emitting element 24 mounted on each light emitting element mounting portion 22 is printed on the main surface. A plurality of through holes 26 through which the protrusions 66 of the base member 60 are inserted are provided at predetermined positions of the flexible printed wiring board 20. The flexible printed wiring board 20 has a cable 28 connected to a control board (not shown) for controlling turning on and off of the light emitting element 24 on one end side. The light emitting element 24 is, for example, a semiconductor light emitting element (LED). In the present embodiment, three light emitting element mounting portions 22 and three light emitting elements 24 are used, but the number is not particularly limited.

  The heat radiating member 40 is a member for radiating the heat generated in the light emitting element 24, and is attached to the back surface side of each light emitting element mounting portion 22 in the flexible printed wiring board 20. That is, the heat radiating member 40 is arranged so that at least a part of the existence region thereof overlaps at least a part of the existence region of the light emitting element mounting portion 22 and the light emitting element 24 when viewed from the front of the lamp, and the flexible printed wiring board 20. Fixed to. The heat radiating member 40 has a contact portion 42 that touches the main surface (the other main surface) on the rear side of the lamp of the flexible printed circuit board 20, and an extending portion 44 that extends rearward from the contact portion 42.

  The heat radiating member 40 is made of a material having high thermal conductivity, and in the present embodiment, is constituted by a metal plate such as aluminum. The contact portion 42 and the extension portion 44 are formed by bending a metal plate. That is, by bending both ends of the metal plate, a flat contact portion 42 and two flat extension portions 44 that protrude from both sides of the contact portion 42 toward the rear side of the lamp, and whose main surfaces face each other, Is formed. The distance between the main surfaces of the two extending portions 44 facing each other is larger than the width dimension of the left and right side surfaces of the support portion 64 described later, and smaller than the dimension between the top portions of the convex portions 68 provided on the left and right side surfaces. Designed to. The contact portion 42 is provided with a through hole 46 through which the protrusion 66 of the base member 60 is inserted. Each extension 44 is provided with an opening 48 for lance fitting described later.

  The heat radiating member 40 is fixed to the flexible printed wiring board 20 by bonding the main surface of the contact portion 42 to the main surface of the flexible printed wiring board 20 on the rear side of the lamp with an adhesive having thermal conductivity. Yes. Therefore, the heat dissipation member 40 is in surface contact with the flexible printed wiring board 20 at the contact portion 42. The heat generated in the light emitting element 24 is transmitted to the contact portion 42 via the light emitting element mounting portion 22 of the flexible printed wiring board 20, and is transmitted from the contact portion 42 to the extending portion 44.

  The base member 60 is a member for supporting the plurality of heat radiating members 40 and is made of a resin material such as polycarbonate, for example. The base member 60 is fixed to the lamp body 2 via a bracket.

  The base member 60 has a substantially plate-like main body portion 62 extending in the left-right direction of the lamp, and a plurality of substantially rectangular support portions 64 protruding from the main body portion 62 toward the front side of the lamp. The plurality of support portions 64 are arranged at predetermined intervals in the left-right direction of the lamp, and the heat dissipation member 40 is engaged with each support portion 64. On the front surface of each support portion 64 (surface on the front side of the lamp), a protrusion 66 that protrudes to the front side of the lamp is provided. Further, convex portions 68 for lance engagement described later are provided on both side surfaces (surfaces on the left and right sides of the lamp) of each support portion 64, respectively. A through hole 70 through which a fastening member 90 described later is inserted is provided at both ends of the main body 62 in the left-right direction of the lamp.

  The inner lens 80 has a plurality of lens portions 82 and a connecting portion 84 that connects these lens portions 82. The connecting portion 84 extends in the left-right direction of the lamp, and through holes 86 through which fastening members 90 described later are inserted are provided at both ends thereof. In the inner lens 80 of the present embodiment, the lens portion 82 and the connecting portion 84 are integrally formed of a light-transmitting resin or glass. The lens unit 82 projects the light emitted from the light emitting element 24 in front of the lamp.

  As for the some light emitting element mounting part 22 of the flexible printed wiring board 20, the at least 2 adjacent light emitting element mounting part 22 has shifted | deviated to the lamp front-back direction. In the present embodiment, all the light emitting element mounting portions 22 are displaced in the lamp front-rear direction. Therefore, the plurality of light emitting elements 24 are arranged so as to be shifted in the lamp front-rear direction. In the present embodiment, the main body portion 62 of the base member 60 has a stepped shape, whereby the position of the front surface of the support portion 64 is shifted in the front-rear direction of the lamp, and as a result, the light emitting element mounting portion 22 and the light emitting element 24 are It is shifted back and forth. The light emitting element mounting part 22 and the light emitting element 24 may be displaced back and forth by the main body part 62 having a planar shape and different protrusion lengths of the support part 64 toward the front of the lamp. Further, the front-rear displacement of the light-emitting element mounting portion 22 and the light-emitting element 24 can be designed so that, for example, the one located at the side and / or above the vehicle is located behind the lamp or in front of the lamp. Since the flexible printed wiring board 20 has flexibility, it can be easily deformed in accordance with the shape of the base member 60. Therefore, the manufacturing process of the vehicular lamp 1 can be simplified.

  Next, the engagement structure of the flexible printed wiring board 20, the heat radiating member 40, and the base member 60 will be described. The lamp unit 10 according to the present embodiment includes a first engagement mechanism 100 and a second engagement mechanism 102 in order to engage the flexible printed wiring board 20, the heat radiating member 40, and the base member 60. The first engagement mechanism 100 is a mechanism that engages the base member 60 and the extending portion 44, and includes an opening 48 as a heat radiation member side first engagement portion and a base member side first engagement portion. It is comprised with the convex part 68. FIG. The second engagement mechanism 102 is a mechanism for engaging the base member 60 with the contact portion 42 and the flexible printed wiring board 20. The through hole 26 serving as the flexible printed wiring board side engaging portion and the second on the heat dissipation member side. A through hole 46 as an engaging portion and a protrusion 66 as a base member side second engaging portion are configured.

  More specifically, as shown in FIG. 2, the flexible printed wiring board 20 to which the plurality of heat radiating members 40 are fixed is made to approach the base member 60 from the lamp front side of the base member 60. The positional relationship between the flexible printed wiring board 20 and the heat radiating member 40 is determined so that the through hole 26 and the through hole 46 (see FIG. 1 and the like) overlap, and the flexible printed wiring board 20 to which the heat radiating member 40 is fixed. The through-hole 26, the through-hole 46, and the protrusion 66 are aligned, and are brought close to the base member 60.

  As shown in FIGS. 3A to 3C and 4, when the flexible printed wiring board 20 approaches the base member 60, the support portion 64 enters between the two extending portions 44 and extends. The convex portion 68 of the support portion 64 contacts the main surface inside the portion 44. When the flexible printed wiring board 20 is further brought closer to the base member 60, the extended portion 44 is pressed by the convex portion 68, and the two extended portions 44 are deformed so as to open outward in a direction away from each other. When further approaching, the projecting portion 68 is accommodated in the opening 48, the pressing of the extending portion 44 by the projecting portion 68 is released, and the extending portion 44 is displaced in a direction approaching each other to return to the state before deformation. Thereby, the heat radiating member 40 is lance-fitted to the base member 60. That is, the first engagement mechanism 100 fits and fixes the heat radiating member 40 to the base member 60. The first engagement mechanism 100 engages the flexible printed wiring board 20 with the base member 60 via the heat dissipation member 40 by fitting and fixing the heat dissipation member 40 to the base member 60.

  In this state, the protrusion 66 protrudes from the through hole 46 and the through hole 26. As shown in FIG. 1, a heat caulking process is performed on the portion of the protrusion 66 protruding from the through hole 26, and the protrusion 66 from the through hole 26 and the through hole 46 is prevented from coming off. That is, the second engagement mechanism 102 engages the flexible printed wiring board 20, the heat radiating member 40, and the base member 60 by heat caulking of the through hole 46 and the tip of the protrusion 66 inserted into the through hole 26. Similar to the first engagement mechanism 100, the second engagement mechanism 102 engages only the heat radiating member 40 and the base member 60, and engages the flexible printed wiring board 20 with the base member 60 via the heat radiating member 40. May be combined. Moreover, the 2nd engagement mechanism 102 may engage the flexible printed wiring board 20, the heat radiating member 40, and the base member 60 using fastening members, such as a screw, instead of heat caulking. Further, in the first engagement mechanism 100, the heat dissipation member-side first engagement portion may be a convex portion, and the base member-side first engagement portion may be an opening.

  After the flexible printed wiring board 20 and the heat dissipation member 40 are fixed to the base member 60, the inner lens 80 is attached to the base member 60 from the front side of the lamp. The inner lens 80 and the base member 60 are aligned so that the through-hole 86 and the through-hole 70 overlap each other, and a fastening member 90 such as a screw is inserted into the through-hole 86 and the through-hole 70 to be fixed to each other. The

  In the vehicular lamp 1 according to the present embodiment, the lamp unit 10 can be used as a lamp unit for a turn signal lamp. The lamp unit 10 can also be used as a lamp unit for other marker lamps such as daytime running lamps and clearance lamps, headlamps, tail lamps, and brake lamps.

  As described above, the heat dissipating member 40 in the vehicular lamp 1 according to the present embodiment includes the contact portion 42 that makes surface contact with the flexible printed wiring board 20 and the extending portion 44 that extends rearward from the contact portion 42. And have. Therefore, when the improvement of the heat dissipation of the light emitting element 24 is requested | required, it can respond to the request | requirement by enlarging the extension part 44. FIG. Therefore, it is possible to avoid an increase in the mounting pitch of the light emitting elements 24, and it is possible to avoid an increase in the size of the lamp. Alternatively, the mounting pitch of the light emitting elements 24 can be reduced while maintaining the heat dissipation of the light emitting elements 24. In addition, the degree of freedom in design for the arrangement of the light emitting elements 24 is also improved.

  Further, the vehicular lamp 1 engages the first engagement mechanism 100 that engages the base member 60 and the extended portion 44 of the heat dissipation member 40, and the first engagement mechanism 100 that engages the contact portion 42 of the base member 60 and the heat dissipation member 40. 2 engagement mechanism 102. That is, the heat radiating member 40 functions as a fixing member for fixing the flexible printed wiring board 20 to the base member 60. Therefore, it is not necessary to provide a fixing member for fixing the flexible printed wiring board 20 and / or the heat radiating member 40 to the base member 60 separately from the heat radiating member 40, so that the number of parts can be reduced. Moreover, since the contact part 42 and the extension part 44 can each be engaged with the base member 60, the heat radiating member 40 can be fixed to the base member 60 more reliably.

  Further, the first engagement mechanism 100 fits and fixes the heat radiating member 40 to the base member 60. Therefore, the fixing location of the heat radiating member 40 and the base member 60 by screwing or caulking can be reduced. Therefore, the heat radiating member 40 can be fixed to the base member 60 more easily. Moreover, the heat radiating member 40 is comprised with the metal plate, and the contact part 42 and the extension part 44 are formed by the bending process of the metal plate. Therefore, the heat radiating member 40 can be manufactured easily.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. Embodiments to which such modifications are added Are also included within the scope of the present invention. A new embodiment in which a modification is added to the above-described embodiment has the effects of the combined embodiment and the modification.

  DESCRIPTION OF SYMBOLS 1 Vehicle lamp, 20 Flexible printed wiring board, 22 Light emitting element mounting part, 24 Light emitting element, 40 Heat dissipation member, 42 Contact part, 44 Extension part, 60 Base member, 100 1st engagement mechanism, 102 2nd engagement mechanism.

Claims (4)

A flexible printed wiring board having a plurality of light emitting element mounting portions on one main surface;
A plurality of heat dissipating members attached to the back side of each light emitting element mounting portion on the other main surface of the flexible printed wiring board;
A base member that supports the plurality of heat dissipating members,
The heat radiation member, possess a contact portion in contact with the flexible printed circuit board, and the extending portion extending from the contact portion to the rear, and
The vehicular lamp further includes a first engagement mechanism that engages the base member and the extension part,
A second engagement mechanism for engaging the base member and the contact portion;
Vehicle lamp, characterized in that it comprises a. The vehicular lamp according to claim 1 , wherein the first engagement mechanism fits and fixes the heat dissipation member to the base member. Wherein the plurality of light emitting element mounting portion, the vehicle lamp according to claim 1 or 2 light-emitting element mounting portion adjacent the at least two is shifted in the lamp longitudinal direction. The heat dissipation member is composed of a metal plate,
The contact portion is constituted by a portion of said metal plate folded state, the extending portion is either bent state of the claims 1 to 3 Ru consists of other parts of the metal plate 1 The vehicle lamp according to Item.

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