JP5160966B2 - Light-emitting element feeding structure - Google Patents

Description

  The present invention relates to a vehicle illuminating lamp or a marker lamp using a light emitting element such as an LED (light emitting diode) as a light source, and more particularly to a power feeding structure for supplying power to the light emitting element.

  In recent automobiles, in order to save energy of lamps such as a head lamp and a tail lamp, a lamp using a light emitting element such as an LED element as a light source is proposed. In this type of lamp, an LED element is mounted on a wiring member disposed in the lamp housing, and vehicle-mounted battery power is supplied to the LED element through the wiring member. As this power supply structure, the electrode of the LED element is connected to the wiring member. The structure is mechanically and electrically connected by soldering or the like. However, in a lamp mounted with a large number of LED elements as a light source body, it is necessary to perform soldering on each LED element. Therefore, the number of man-hours for soldering cannot be ignored, resulting in high costs. In addition, since the solder melts due to the heat generated when the LED element emits light and the reliability of soldering may be reduced, the power supplied to the LED element must be limited to suppress the light emission of the LED element. This is an obstacle to increasing the luminous intensity of the lamp.

In order to solve such a problem caused by the soldering structure, Patent Document 1 discloses a structure in which an electrode is exposed to an engaged portion provided in an LED element, while the base member has a conductive portion integrally. There has been proposed a technique in which a joint portion is provided and the LED element is engaged with the engaging portion of the base member to simultaneously hold the LED element and supply power to the electrode. Patent Document 2 proposes a technique in which an electrode of an LED element is ultrasonically bonded to a metal layer of a conductive film for power supply. Thus, by adopting an engagement structure or an ultrasonic bonding structure instead of soldering, it is possible to eliminate a decrease in reliability of soldering caused by at least heat generation of the LED element.
JP 2001-80412 A JP 2005-322450 A

  In the technique of Patent Document 1, power is supplied by directly contacting the electrode of the LED element and the conductive portion of the base member. However, since the electrode and the conductive portion are flat surfaces, contact failure between them tends to occur. In particular, contact failures due to dimensional errors in manufacturing LED elements and base members, and contact failures due to vibrations associated with driving of automobiles are likely to occur, and there is a risk of LED element light emission failure or instantaneous light emission interruption. Further, the LED element of Patent Document 1 requires a structure for exposing the electrode to the engaged portion, and it is difficult to use a commercially available LED element that is standardized as it is. Will be invited. Although the technology of Patent Document 2 provides a highly reliable electrical connection between the LED element and the metal layer, since it is necessary to perform ultrasonic bonding on each LED element, the assembly work is complicated. It is difficult to reduce costs. In addition, because of the ultrasonic welding structure, it is difficult to replace the LED element in maintenance or the like.

  An object of the present invention is to provide a light-emitting element power supply structure that realizes power supply to a light-emitting element without using solder, while increasing the reliability of electrical connection at an electrode and can be configured at low cost. To do.

The present invention includes a planar wiring member that is disposed in close contact with the surface of the base member and has a conductive layer for power supply exposed at least partially, and an electrode facing the planar wiring member. A light emitting element disposed opposite to the member, a fixing means for positioning the light emitting element with respect to the exposed conductive layer of the planar wiring member and fixing the light emitting element in a pressed state with respect to the planar wiring member, and an electrode of the light emitting element and is interposed between the conductive layers, Bei example a contact member of conductive resilient contact with the electrodes and the conductive layer, and the contact member is characterized by being formed integrally with the fixing means.

  According to the present invention, since the electrode of the light emitting element and the conductive layer of the planar wiring member are electrically connected via the elastic contact member, electrical connection with low contact resistance can be realized without using solder. In addition, heat generated in the light emitting element can be efficiently transferred to the planar wiring member via the contact member, and further transferred to the base member, thereby improving heat dissipation. Therefore, the problem of melting of solder and poor connection due to heat generation of the light emitting element can be solved, and highly reliable electrical connection can be obtained. At the time of assembly, it is only necessary to engage the light emitting element, the fixing means, and the contact member, or to screw in part, so that the assembly operation can be simplified and the cost can be reduced.

In the present invention , by forming the contact member integrally with the fixing means, the number of components can be reduced, and the assembly work can be further simplified and the cost can be reduced.

  As one of the preferred embodiments in the present invention, the fixing means is composed of a case for positioning the light emitting element and a cover for pressing the light emitting element toward the planar wiring member. The case and cover or contact member can be sub-assembled to unitize the light emitting elements, which is advantageous in improving the workability of assembly.

  Furthermore, in the present invention, if the cover is configured by a part of the optical member that reflects or refracts the light emitted from the light emitting element, an independent cover becomes unnecessary, the number of parts is reduced, and assembly work is performed. Can be simplified.

  In the present invention, if the base member is configured as a radiator, the heat generated in the light emitting element can be transferred from the planar wiring member to the base member, and further radiated from the base member. Can be increased.

  Next, Example 1 of the present invention will be described. FIG. 1 is a sectional view in which the present invention is applied to a headlamp of an automobile. A lamp housing 2 is composed of a container-shaped lamp body 2 and a light-transmitting cover 3 attached to the front opening of the lamp body 2, and a reflector 4 is disposed in the lamp housing 1, and the reflector A plurality of LED element units 5 as light source bodies are disposed on the back surface side of 4. Each LED element unit 5 is mounted on a planar wiring member 7 supported by a base member 6 also serving as a heat sink, and is connected to an in-vehicle battery not shown in the figure through a connector 8 connected to the planar wiring member 7. In addition, the power of the in-vehicle battery is supplied with power to emit light. The reflector 4 has an opening window 41 corresponding to each LED element unit 5, and the light emitted from each LED element unit 5 is projected through the opening window 41 onto the reflecting surface on the surface side of the reflector 4. The light is reflected and transmitted through the light transmission cover 3, and is irradiated toward the front of the automobile with a required light distribution characteristic.

  Details of the LED element unit 5, the base member 6, and the planar wiring member 7 are shown in FIG. Here, in order to simplify the description, only three LED element units 5 among the many LED element units 5 are illustrated. The base member 6 is formed of a metal having high rigidity such as aluminum or iron and having good thermal conductivity as a heat sink, and a mounting region 61 for mounting each LED element unit 5 follows the shape of the back surface of the reflector 4. It is formed in a step shape having a step in the lateral direction. In addition, the rear surface side of the base member 6 has a plurality of heat dissipating fins 62 protruding rearward in order to enhance the heat dissipating effect in each mounting region. On the other hand, an FPC (flexible printed circuit) extending in the lateral direction is provided as a planar wiring member 7 on the front side of the base member 6, and is stepped along the step shape of the base member 6. It is bent. In this FPC 7, a pair of conductive layers 71 arranged in parallel plane between front and back insulating layers 74 are formed in a required pattern. Here, the conductive layers 71 are arranged adjacent to each other in the vertical direction in FIG. It is formed as a pair of extending conductive layers. The pair of conductive layers 71 is connected to a connector 8 at one end, and is connected to an in-vehicle battery not shown in the drawing. Further, the FPC 7 is formed with a window portion 72 from which the insulating layer on the front side is partially removed at locations corresponding to the mounting regions 61 of the base member 6, and the conductive layers 71 are formed in the window portion 72. Is exposed.

  FIG. 3 is a partially exploded perspective view of the LED element unit 5, the base member 6, and the planar wiring member 7. A pair of screw holes 63 for fixing the LED element unit 5 is opened in each mounting region 61 of the base member 6, and a pair of insertion holes 72 are opened in the corresponding FPC 7. The LED element unit 5 has, as a conceptual configuration, an LED element 51, fixing means for fixing the LED element 51 to the base member 6 and the planar wiring member 7, and the LED element 51 to the planar wiring member 7. And a contact member for electrical connection. Here, the fixing means includes a case 52 and a cover 5. The LED element 51 is configured as a discrete LED element in which a lens 512 is integrated with the top surface of a package 511 having an outer shape close to a flat quadrangular prism, and a pair of electrodes 513 is formed on the bottom surface of the package 511 as indicated by a broken line. Are arranged side by side. In the LED element 51, power is supplied to the pair of electrodes 513 so that an LED chip that is not shown in the figure inside the package 511 emits light, and the emitted light passes through the lens 512 and is condensed. Since such an LED element is widely known, detailed description thereof is omitted here.

  The case 52 is formed of a rectangular parallelepiped insulating resin having a rectangular (square) storage port 521 penetrating in the plate thickness direction so that the LED element 51 can be stored. A pair of insertion holes 522 corresponding to the screw holes 63 of the base member 6 are opened, and the pair of screws 50 inserted through the insertion holes 522 are passed through the insertion holes 73 of the FPC 7 and then the base member 6 The case 52 and the FPC 7 are fixed to the mounting region 61 of the base member 6 by being screwed into the screw holes 63. In addition, a pair of contact members 54 are respectively supported at one end in the storage port 521 of the case 52. In the first embodiment, these contact members 54 are formed by forming a conductive material having elasticity, such as copper, in a strip shape and supporting one end integrally formed with the case 52, and the other end is curved in the thickness direction. It is processed and configured as a contact piece having a circular or elliptical shape. When the LED element 51 is stored in the storage port 521, these contact pieces 54 come into contact with the pair of electrodes 513 of the LED element 51 on one side, and at the same time, are exposed in the window 72 of the FPC 7 on the other side. Both surfaces of the case 52 are formed so as to protrude toward the rear surface side of the front surface side of the case 52 so as to contact the pair of conductive layers 71 formed. Further, tapered engagement claws 523 are integrally formed on the left and right side surfaces of the case 52.

  The cover 53 is made of an elastic metal plate and is generally U-shaped, and a circular window 531 through which the lens 512 of the LED element 51 is inserted is opened in the center piece 53c. Engagement holes 532 that can be engaged with the engaging claws 523 of the case 52 are opened in the right side pieces 53r. When the cover 53 is covered from the front side of the case 52, the engagement holes 532 of the side pieces 53 l and 53 r are engaged with the engagement claws 523, and the cover 53 is attached to the case 52. Become.

  According to this configuration, when assembling the lamp, referring to the vertical sectional view and the horizontal sectional view of FIGS. 4A and 4B, the LED element 51 is first housed in the housing port 521 of the case 52, The cover 53 is covered from the front side of the case 52 so as to cover the LED element 51 from the front, and the engagement holes 532 of the left and right side pieces are engaged with the engagement claws 523. As a result, the cover 53 is integrated with the case 52, and at the same time, the LED element 51 is inserted and supported in the case 52, and the LED element unit 5 sub-assembled with these is constituted. In this LED element unit 5, the LED element 51 is prevented from falling off in front of the storage port 521 by the cover 53, and the pair of electrodes 513 are respectively brought into contact with the pair of contact pieces 54 on the rear surface side. It is also possible to prevent the outlet 521 from dropping out. Then, the LED element unit 5 is fixed to the base member 6. Here, the pair of screws 50 are inserted into the insertion holes 522 of the case 52, and then inserted into the screw holes 63 of the base member 6 after the insertion holes 73 of the FPC 7 are inserted. As a result, the LED element unit 5 is fixed to the base member 6. At this time, the FPC 7 is fixedly supported while being sandwiched between the LED element unit 5 and the base member 6. In this fixed state, the pair of contact pieces 54 come into contact with the pair of conductive layers 71 exposed from the FPC 7 so that electrical conduction is performed. Since these contact pieces 54 are in contact with the pair of electrodes 513 on the back surface of the LED element 51, each electrode 513 of the LED element 51 is electrically connected to the pair of conductive layers 71 of the FPC 7 via these contact pieces 54. Will be.

  When the electric power of the vehicle-mounted battery is supplied to the conductive layer 71 of the FPC 7 via the connector 8 shown in FIG. 1, the LED element 51 is supplied with power from the conductive layer 71 via the contact piece 54 to emit light. The emitted light is emitted forward from the lens 512 of the LED element 51, is projected onto the reflecting surface of the reflector 4 through the opening window 41 of the reflector 4, and is irradiated toward the front of the automobile here. On the other hand, the heat generated with the light emission of the LED element 51 is transferred from the four side surfaces of the package 511 to the case 52 and further transferred to the base member 6. At the same time, the heat is transferred from the electrode 513 on the back surface of the package 511 to the conductive layer 71 of the FPC 7 through the contact piece 54 and further transferred to the base member 6 in contact therewith. The heat transferred to these base members 6 is radiated through the radiation fins 62. Thereby, overheating of the LED element 51 is prevented, and stable light emission of the LED element 51 is maintained.

  As described above, in Example 1, the LED element 51 can be configured by manually storing the LED element 51 in the case 52 and further engaging the cover 53 with the case 52. Since the LED element can be mounted in the lamp housing 1 by screwing the base member 6 together with the FPC 7, soldering and other ultrasonic welding operations such as Patent Document 2 are not necessary when assembling the lamp. This is unnecessary and is advantageous in reducing the cost of the lamp by suppressing an increase in work man-hours. On the other hand, in the electrical connection between the LED element 51 and the FPC 7, the contact is maintained by the elastic force of the contact piece 54 interposed between the electrode 513 and the conductive layer 71. Contact failure is rarely caused by vibration or the like, and light emission failure or instantaneous light emission interruption in the LED element 51 can be prevented. Further, by increasing the width dimension of the contact piece 54 as much as possible, the heat transfer effect from the LED element 51 to the FPC 7 is enhanced, and this is advantageous in enhancing the heat dissipation effect of the LED element 51.

  FIG. 5 is a partial perspective view of a main part of the second embodiment which is a modification of the fixing means of the present invention. Parts equivalent to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, a contact member constituting a part of the LED element unit 5 is configured as a separate part from the case 52. The case 52 has a storage port 521 for storing the LED element 51 as in the first embodiment, but the contact piece 54 as in the first embodiment is not provided in the storage port 521. Instead, a frame body 551 made of an insulating resin having a rectangular frame shape having a size approximately equal to the outer shape of the package 511 of the LED element 51 and capable of being housed in the housing port 521 is provided, and a pair of contact points is provided inside the frame body 551. A contact member 55 that integrally supports the piece 552 is provided. The configuration of these contact pieces 552 is almost the same as that of the contact piece 54 of the first embodiment, but the parts processed into a circular or elliptical shape by bending in the thickness direction are the front side and the rear side of the frame 551. It is important to have a configuration that protrudes to the side.

  In the second embodiment, when assembling the lamp, referring to the vertical sectional view and the horizontal sectional view of FIGS. 6A and 6B, the case 52 is first screwed to the base member 6 with the FPC 7 interposed therebetween. Secure with screws. Then, the contact member 55 is installed in the storage port 521 of the case 52, then the LED element 51 is installed, and finally the cover 53 is covered from the front side of the case 52, and the engagement hole 532 is attached to the engagement claw 523. Engage. By doing in this way, the LED element unit 5 of the state fixed with respect to the base member 6 and FPC7 can be assembled. In the assembled LED element unit 5, the contact member 55 is interposed between the electrode 513 on the back surface of the LED element 51 and the exposed conductive layer 71 of the FPC 7, and the frame 551 of the contact member 55 is connected to the LED element 51 and the FPC 7. The contact piece 552 of the contact member 55 makes electrical connection between the electrode 513 of the LED element 51 and the conductive layer 71 of the FPC 7 in the same manner as in the first embodiment. Can be emitted. It goes without saying that the heat generated by the light emission of the LDE element 51 is transferred to the base member 6 through the case 52 and the FPC 7 and is radiated from here.

  The second embodiment can use the same case or cover even when LED elements having different standards are used. For example, even in the case of LED elements having different package thickness dimensions and LED elements having different positions and dimensions of electrodes on the back side of the package, the contact piece is changed to a standard contact member corresponding to the position and dimensions of the electrodes of the LED elements. Power can be supplied to the LED element. For example, as shown in FIG. 7A, even in the case of the LED element 51A in which the electrode 514 protrudes in an L shape from the back surface of the package 511, a contact member 55A having a reduced thickness dimension of the frame 551 is prepared. Thus, even when the same case 52 and cover 53 are used, electrical connection between the electrode 514 of the LED element 51A and the conductive layer 71 of the FPC 7 can be secured, and power supply to the LED element 51A can be achieved. Alternatively, as shown in FIG. 7B, even in the case of the LED element 51 </ b> B whose outer dimension of the package 511 is smaller than the dimension of the storage port 521 of the case 52, the peripheral part of the frame 551 is connected to the side surface of the package 511 By using the contact member 55B having the protruding edge 551a formed so as to protrude between the inner surface of the 521, the protruding edge 551a absorbs backlash between the package 511 of the LED element 51B and the storage port 521. It functions as a spacer, and the LED element 51B can be stored in a stable position in the storage port 521.

  In the first and second embodiments, the case 52 is screwed to the base member 6, and the screw hole 63 of the base member 6 is changed to an insertion hole, and the insertion hole 522 of the case 52 is changed to a screw hole. Thus, the case 52 may be fixed to the base member 6 by screwing the screw inserted into the insertion hole from the back side of the base member 6 into the screw hole of the case 52.

  FIG. 8 is a partial perspective view of an essential part of Embodiment 3 which is another modification of the fixing means of the present invention. In the first and second embodiments, the case is screwed to the base member, but in the third embodiment, this screwing is unnecessary. The third embodiment shows a modification of the first embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Here, a pair of bosses 64 project from the front surface of the mounting region 61 of the base member 6 at positions corresponding to the insertion holes 522 of the case 52, and the bosses 64 are formed in the insertion holes 73 of the FPC 7 and the case 52. These are inserted into the insertion holes 522, and the positioning of the case 52 and the FPC 7 with respect to the base member 6 is performed by these. The case is the same as that of the first embodiment, and a pair of contact pieces 54 constituting the contact member of the present invention are disposed in the storage port 521 in a supported state. On the other hand, the cover 53A is the same as the first and second embodiments in the center piece 53c and the left and right side pieces 53l and 53r. The upper piece 53u and the lower piece 53d are provided, the tips of the upper piece 53u and the lower piece 53d reach the upper surface portion and the lower surface portion of the base member 6, and the hook portion is bent inward. 533 is formed. Corresponding to the hook portion 533, slits 65 into which the hook portion 533 can be fitted are formed on the upper surface portion and the lower surface portion of the base member 6, respectively.

  In the third embodiment, referring to the vertical sectional view and the horizontal sectional view of FIGS. 9A and 9B, first, the insertion hole 73 of the FPC 7 and the insertion hole 522 of the case 52 are inserted into the boss 64 of the base member 6. The case 52 is temporarily fixed. On top of that, the LED element 51 is housed in the storage port 521 of the case 52. Finally, the cover 53A is engaged with the case 52. The cover 53A is integrated with the case 52 by covering the front surface side of the LED element 51, that is, the front surface side of the case 52, and engaging the engagement holes 532 with the engagement claws 523, and the LED element 51 is received by the cover 53A. It is prevented from dropping from the front of 521. At the same time, the hooks 533 of the upper piece 53u and the lower piece 53d of the cover 53A are engaged with the slits 65 on the upper surface and the lower surface of the base member 6 to fix the cover 53A to the base member 6. As a result, the case 52 and the FPC 7 are fixed while being sandwiched by the base member 6 via the cover 53A. At this time, it is needless to say that the LED element 51 is prevented from coming off behind the storage port 521 as the pair of electrodes 513 are in contact with the pair of contact pieces 54 of the contact member on the back surface as in the first embodiment. Further, since the pair of contact pieces 54 come into contact with the pair of conductive layers 71 exposed from the FPC 7 and electrical conduction is performed, the pair of electrodes 513 of the LED element 51 is connected to the FPC 7 via the contact pieces 54. The pair of conductive layers 71 are electrically connected.

  In the third embodiment, a screw fastening operation for fixing the case 52 to the base member 6 is not necessary, so that the assembly operation can be greatly simplified. Since the case 52 is supported while being pressed against the base member 6 by the cover 53A, the stability of the support is slightly lower than that of fixing with screws as in the first and second embodiments, but the LED element 51 and the FPC 7 Since the elastic contact piece 54 is interposed between the electrodes, the reliability of the electrical connection between the electrode 513 of the LED element 51 and the conductive layer 71 of the FPC 7 is not lowered.

  In the third embodiment, when there is a margin in the vertical dimension of the front surface of the mounting area of the base member 6, a pair of slits extending in the horizontal direction are formed at vertical positions sandwiching the FPC 7 on the front surface of the mounting area. Alternatively, the hooks 533 of the upper piece 53u and the lower piece 53d of the cover 53A may be inserted into the slit to engage with the slit, and the cover 52 may be fixed to the base member 6. In this case, it may be necessary to change the shape of the hook portion 533 from that of the third embodiment to engage the slit.

  FIG. 10 is a partial perspective view of Embodiment 4 which is still another modification of the fixing means of the present invention. Here, the case is also used as a cover, and the case is omitted. Since the case 52 in the second embodiment is for performing the positioning function of the LED element 51 and the contact member 55, this is also performed by the cover. Therefore, the cover 53B of the fourth embodiment has the left and right side pieces 53l and 53r. And the upper and lower side pieces 53u, 53d form a rectangular container-like portion that surrounds the periphery of the LED element 51 and the contact member 55, and supports and positions the LED element 51 and the contact member 55 in this rectangular container-like part. Like to do. Further, the upper and lower side pieces 53u and 53d of the cover 53B are made larger in the vertical direction than the rectangular container portion so as to correspond to the vertical dimension of the base member 6 in the same manner as in the third embodiment, so A hook portion 533 is provided that engages with the slit 65 provided at the top. In the fourth embodiment, the cover 53B does not require an engagement hole in the left and right side pieces 53l and 53r. Since the FPC 7 needs to be positioned with respect to the base member 6, the length of the boss 64 is made shorter than that in the third embodiment.

  In the fourth embodiment, referring to the vertical sectional view and the horizontal sectional view of FIGS. 11A and 11B, a rectangle enclosed by the upper, lower, left and right side pieces 53l, 53r, 53u, 53d of the cover 53B. The LED element 51 and the contact member 55 are sequentially inserted into the container-like portion from the rear surface side, and the hook portions 533 of the upper and lower pieces of the cover 53B are inserted into the slits 65 on the upper and lower surfaces of the base member 6 while the FPC 7 is interposed therebetween. Engage. The LED element 51, the contact member 55, and the FPC 7 are fixed to the base member 6 while being sandwiched between the base member 6 and the cover 53B. The electrode 513 of the LED element 51 is electrically connected to the conductive layer 71 of the FPC 7 via the contact piece 552 of the contact member 55, so that power can be supplied to the LED element 51. Also in the fourth embodiment, when there is a margin in the area where the FPC 7 is vertically sandwiched on the front surface of the mounting area of the base member 6, a slit may be provided on the front surface to engage the hook portion 533.

  FIG. 12 is a partial perspective view of a fifth embodiment, which is still another modified example of the fixing means of the present invention, in which the cover and the case are omitted and a sub-plate is used instead. The sub-plate 56 is formed in a plate shape having a size corresponding to the front surface of the mounting region of the base member 6 with heat-conductive resin or the like, and is fixed to the front surface of the base member 6 by adhesion, for example. Or you may fix to the base member 6 with a screw | thread. A pair of engaging pieces 561 protrudes forward from the front surface of the sub-base 56. These engagement pieces 561 can be inserted through slits 75 provided at positions where the window 72 of the FPC 7 is sandwiched vertically, and hook portions 562 projecting inward are provided at the respective ends of the engagement pieces 561. Is provided. The projecting dimensions of the pair of engaging pieces 561 are substantially equal to the combined height of the LED element 51 package and the height of the contact member 55, and the opposing distance between the engaging pieces 561 is the package of the LED element 51. 511 and the side dimension of the frame body 551 of the contact member 55 are substantially equal.

  In the fifth embodiment, referring to the vertical sectional view and the horizontal sectional view of FIGS. 13A and 13B, the engagement piece 561 is formed in the slit 75 of the FPC 7 with respect to the sub-base 56 fixed to the base member 6. The FPC 7 is temporarily fixed to the base member 6 by being inserted. At this time, the exposed conductive layer 71 of the FPC 7 is positioned between the upper and lower sides of the engagement piece 561. Next, the contact member 55 is inserted between the upper and lower engaging pieces 561 from the front side, and then the LED element 51 is inserted. When the LED element 51 is inserted, the hook portions 563 of the engagement pieces 561 engage with both shoulders of the package 511 of the LED element 51, and the LED element 51 presses the contact member 55 against the surface of the FPC 7 by this engagement force. In this state, it is fixed to the sub-base 56 and finally fixed to the base member 6. By this fixed support, the electrode 513 of the LED element 51 is brought into contact with the conductive layer 71 of the FPC 7 via the contact piece 552 of the contact member 55 to be electrically connected.

  In the fifth embodiment, although not shown, the hook portion 562 of the engagement piece 561 does not necessarily engage with the shoulder portion of the package 511 of the LED element 51. For example, the electrode 513 is formed on both sides of the package 511. When a part of the electrode 513 is extended, the hook part 562 may be engaged with a part of the electrode 513 to be fixed. Although not shown, if a pair of engaging pieces can be integrally formed on the front surface of the base member 6, the sub-base is unnecessary, the number of parts can be further reduced, and the number of assembly steps can be further increased. Reduction is also possible.

  FIG. 14 is a partial cross-sectional view of the sixth embodiment which is a modification of the second embodiment, in which the cover 53 is also used as the reflector 4. A pair of engaging pieces 42 are formed to project rearward at positions sandwiching the opening window 41 of the reflector 4 shown in FIG. 1, and these engaging pieces 42 engage with the engaging claws 523 of the case 52. A joint hole 43 is formed. In Example 6, the case 52 is screwed to the base member 6 so as to sandwich the FPC 7 with respect to the base member 6 disposed in the lamp housing 1, and then the LED element 51 is attached to the storage port 521 of the case 52. Interpolate. A contact piece 54 is provided in the storage port 521 of the case 52 as in the first embodiment. Accordingly, when the reflector 4 is mounted from the front side of the base member 6, the pair of engaging pieces 42 of the reflector 4 are put on the front side of the case 52, and the engaging holes 43 of the engaging piece 42 are formed in the case 52. The reflector 4 and the case 52 are integrated with each other. Thereby, the LED element 51 is held in the storage port 521 of the case 52 in a state in which the LED element 51 is prevented from falling forward by the reflector 4. At this time, the contact piece 54 is in contact with the electrode 513 of the LED element 51 and the conductive layer 71 of the FPC 7 so as to be electrically connected to each other, and power supply to the LED element 51 is enabled as in the first embodiment. . In the sixth embodiment, the reflector 4 also serves as a cover, and the cover is unnecessary, so that the number of parts can be reduced and the number of steps for attaching the cover can be reduced.

  The configuration in which the cover and the reflector are integrated as in the sixth embodiment can be similarly applied to the third, fourth, and fifth embodiments. On the contrary, as shown in FIG. 15, the LED element 51 </ b> C that does not include a lens is used as a light source, and the light emitted from the LED element 51 </ b> C is condensed by an independent condenser lens. When applied to a lamp that irradiates forward, the cover 53C may be made of a transparent resin integrally formed with a condensing lens 534 for condensing light emitted from the LED element 51C. In this case, the cover 53C also serves as a bracket for the condenser lens 534, reducing the number of lamp parts and reducing the number of mounting steps.

  FIG. 16A is a perspective view of Example 7 showing a modification of the contact piece 54 used in Example 1 or the like. In Example 1 or the like, a metal plate is bent as the contact piece 54, and the electrical connection between the electrode of the LED element and the conductive layer of the FPC is performed using the elastic force of the metal plate. In the contact piece 54A, the contact piece is made of a material having a shape restoring force. Here, as shown in FIG. 6B, a flexible flexible conductive film 542 is bonded to the surface of a rectangular flexible insulating film 541 and both ends and both sides are covered with a surface insulating film 543. A sheet material is formed. Here, the pair of conductive films 542 are arranged in a plane substantially in parallel. The sheet material is bent so as to be folded substantially at the center as shown in FIG. 3C, and both the folded ends are bonded to form an endless curved portion 544 in which the conductive film 542 is exposed on the outer surface. Accordingly, as shown in FIG. 4D, silicon gel 545 is housed as a material having a shape restoring force in the curved portion. This sheet material may be composed of FPC from which the insulating film on one side is partially removed. The contact piece 54 </ b> A is built in the storage port 521 of the case 52, and the base end portion is integrated with the case 52, whereby a case similar to that of the first embodiment can be configured.

  Further, as the contact member 55A in place of the contact member 55 in the second embodiment, a contact member is formed using a material having a shape restoring force as shown in FIG. Here, as shown in FIG. 5B, a flexible flexible conductive film 556 is bonded to the surface of a rectangular flexible insulating film 555, and both ends and both sides are covered with a surface insulating film 557. A sheet material is formed. Here, a pair of wide conductive films 556 are arranged in a plane so as to be aligned in the length direction. As shown in FIG. 3C, the sheet material is bent so that both ends are folded, and the folded ends are bonded to the insulating film 555, and the conductive film 556 is exposed on the outer surface. A curved portion 558 is formed at both ends. Accordingly, as shown in FIG. 4D, silicon gel 559 is housed as a material having a shape restoring force in these curved portions. This sheet material may be composed of FPC from which the insulating film on one side is partially removed. The contact member 55A can be used similarly to the contact member 55 of the second embodiment.

  In the contact piece 54A and the contact member 55A of the seventh embodiment, the silicon gels 545 and 559 are deformed into a compressed state when sandwiched between the LED element 51 and the FPC 7, and the conductive film 542 is deformed by the deformation restoring force at that time. , 556 are in close contact with the electrode 513 of the LED element 51 and the conductive layer 71 of the FPC 7, respectively, and electrically connect them. Since the conductive material 542 and 556 are in close contact with each of the electrode 513 and the conductive layer 71 due to the flexibility of the sheet material as the base material and the restoring force of the silicon gels 545 and 559, the above-mentioned Compared with the contact piece 54 and the contact member 55 made of the metal plate of Examples 1 to 6, the contact area between the two is increased, the electrical resistance is reduced and the heat transfer from the LED element 51 to the base member 6 is increased. It becomes possible to enhance the heat dissipation effect.

  In the first to seventh embodiments, the FPC is used as the planar wiring member according to the present invention. However, a PCB (printed wiring board) or FFC (flexible flat cable) can also be used. In the case of a PCB, as shown in FIG. 18, a rectangular plate-like PCB 57 is disposed on the front surface of a plurality of mounting regions of the base member 6 by screws or adhesives, and then placed on the surface of the substrate of each PCB 57. The formed conductive layer 571 is connected to an in-vehicle power source not shown in the figure by a connector 572 and a cable 573. Then, the LED element unit 5 is fixed to the PCB 57 with the screws 50 as in the first embodiment. As a result, the electrode 513 of the LED element 51 of the LED element unit 5 is electrically connected to the conductive layer 571 of the PCB 57 via the contact piece 54 supported by the case 52. Although illustration is omitted, FFC can be applied in substantially the same manner as FPC.

  In each of the above embodiments, as a method for fixing the case to the base member, an engagement piece may be provided on the case, and the engagement piece may be engaged with the base member for fixation. Moreover, in this invention, although the example which used the LED element as a light emitting element concerning this invention was shown in Examples 1-7, it is also possible to use an EL element (electroluminescence element) and LD element (laser diode). It is. Furthermore, the present invention is not limited to the automotive headlamp of the first embodiment, and can be applied as a power feeding structure for light emitting elements of various vehicle headlamps, other illumination lamps, or marker lamps.

It is sectional drawing which shows the whole structure of the lamp | ramp to which this invention is applied. FIG. 3 is an exploded perspective view of a part of the lamp according to the first embodiment. 2 is a partial exploded perspective view of a main part of Example 1. FIG. 2 is a vertical sectional view and a horizontal sectional view of a main part of Example 1. FIG. FIG. 6 is a partial exploded perspective view of a main part of Example 2. It is the vertical sectional view and horizontal sectional view of the principal part of Example 2. It is the vertical sectional view and horizontal sectional view of the modification of Example 2. FIG. 10 is a partial exploded perspective view of a main part of Example 3. It is the vertical sectional view and horizontal sectional view of the principal part of Example 3. FIG. 10 is a partial exploded perspective view of a main part of Example 4. It is the vertical sectional view and horizontal sectional view of the principal part of Example 4. FIG. 10 is a partial exploded perspective view of a main part of Example 5. FIG. 10 is a vertical sectional view and a horizontal sectional view of a main part of Example 5. 7 is a horizontal sectional view of Example 6. FIG. FIG. 10 is a horizontal cross-sectional view of a modification of Example 6. FIG. 10 is an external view and a cross-sectional view of Example 7. FIG. 16 is an external view and a cross-sectional view of a modified example of Example 7. FIG. 10 is a partial perspective view of an eighth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp housing 4 Reflector 5 LED element unit 6 Base member 7 FPC (planar wiring member)
51 LED element 52 Case 53 Cover 54 Contact piece (contact member)
55 Contact member 71 Conductive layer 511 Package 512 Lens 513 Electrode

Claims (4)

A planar wiring member that is disposed in close contact with the surface of the base member and at least partially exposes a conductive layer for power supply, and an electrode facing the planar wiring member. Light emitting elements arranged opposite to each other, fixing means for positioning the light emitting elements with respect to the exposed conductive layer of the planar wiring member and fixing the light emitting element in a pressed state with respect to the planar wiring member, and the light emission A conductive contact member interposed between the electrode of the element and the conductive layer and elastically contacting the electrode and the conductive layer is provided , and the contact member is formed integrally with the fixing means. Light-emitting element feeding structure. The light emitting element according to claim 1, wherein the fixing means includes a case for positioning the light emitting element and a cover for pressing the light emitting element toward the planar wiring member. Feeding structure. The light emitting element feeding structure according to claim 2 , wherein the cover is constituted by a part of an optical member that reflects or refracts light emitted from the light emitting element. The base member has the light emitting element feeding structure according to any one of claims 1 to 3, characterized in that it is constructed as a heat radiator.

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