JP2007188832A - Lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp capable of effectively restraining temperature rise of a light source and, of which, an outer shell member for heat dissipation can be equipped with a heat conduction channel led from the light source with little time and effort. <P>SOLUTION: A heat-receiving face 5 and a screw part 3 surrounding it are formed at one open end part of a first outer shell member 2 made of metal with its one end opened and the other end fitted with a base 61 and containing a lighting circuit 51 inside. A metallic light source mounting member 12 having a periphery part 12a in contact with the heat-receiving face 5 is installed to close the open end. A light source 21 having a light-emitting element 24 is mounted on the surface of the light source mounting member 12 so as to conduct heat to the same. Cylindrical cover parts 42, 43 surrounding the light source 21, a pressing part 44 in contact with the surface of a the periphery part 12a of the light source mounting member 12 positioned around the light source 21, and a second outer shell member 41 made of metal having a screw-in cylinder part 45 screwed into the screw part 3 are coupled with the first outer shell member 2 with the periphery part 12a pinched between them and the light-receiving face 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lamp including a light source having a light emitting element such as an LED (light emitting diode).

  It is known that the lifetime of an LED shortens as the light output decreases as its temperature rises. For this reason, in the lamp | ramp which used LED as a light emitting element, it is calculated | required to suppress the temperature rise of LED.

  2. Description of the Related Art Conventionally, in consideration of such demands, there is known an LED bulb including a metal heat radiating portion for releasing heat transmitted from an LED to the outside and exposing the heat radiating portion to the outside (for example, see Patent Document 1). .)

  In the LED bulb of Patent Document 1, an LED is mounted on the outer surface of a metal substrate provided in a substantially spherical body. The substantially spherical body is formed of a metal heat dissipating portion having a cap at one end and a trumpet shape toward the opening at the other end, and a translucent cover attached to the opening. A peripheral portion of the metal substrate is fixed to the opening through an insulating high heat conduction member.

As a result, the heat generated by the LED during the lighting of the LED bulb is transmitted from the metal substrate to the trumpet-shaped metal heat radiation part via the high heat conduction member, and is released into the atmosphere from the outer peripheral surface of this heat radiation part. , LED temperature rise can be suppressed.
JP 2001-243809 (paragraphs 0005, 0011-0013, FIG. 1)

  In the technique of Patent Document 1, the cover that covers the LED needs to be light-transmitting so as not to prevent light projection, and this cover does not contribute to heat dissipation. For this reason, the heat of the LED is thermally conducted from the metal substrate to the metal heat dissipating part and is only released from the surface of the heat dissipating part into the atmosphere, so there is room for improvement in suppressing the LED temperature rise. There is. This becomes more apparent as the lamp becomes smaller in size because the heat radiating portion becomes smaller and the heat radiating area decreases.

  Also, as a method of attaching the peripheral portion of the metal substrate to the opening end portion of the heat radiating portion via the high heat conductive member, the first method used as a joining member by melting the high heat conductive member and then solidifying it, or the high heat conductive member A second method in which the metal substrate and the heat radiating part are press-fitted into and out of the metal plate, or a third method in which the metal substrate and the heat radiating part are bonded to the inside and outside of the high heat conductive member using an adhesive instead of the press-fitting can be considered.

  However, the first method requires a heating furnace and takes time to implement, and in order to prevent thermal stress on the LED, it is necessary to attach the LED to the metal substrate after obtaining the first method. There is a problem. In the second method, a device for press-fitting is necessary and the press-fitting work is required twice, which is troublesome. In the third method, the time and effort for bonding are required twice, and it takes time until the adhesive is solidified.

  An object of the present invention is to provide a lamp that can effectively suppress a temperature rise of a light source and can easily form a heat conduction path from the light source to an outer member for heat dissipation.

  According to the first aspect of the present invention, a metal first outer member in which one end is opened, a heat receiving surface and a screw portion surrounding the heat receiving surface are formed at an end of the opening, and a lighting circuit is accommodated therein. A base disposed on the other end side of the outer member; a metal light source mounting member having a peripheral portion in contact with the heat receiving surface and having the one end opening closed; and a light emitting element A light source mounted on the surface of the light source mounting member so as to conduct heat to the light source mounting member; a cylindrical cover portion surrounding the light source; a periphery of the light source mounting member positioned around the light source A metal part connected to the first outer member by holding the presser part in contact with the part surface and a screwed cylinder part screwed into the screw part, and sandwiching the peripheral part with the heat receiving surface A second outer member; and a second outer member;

  In the present invention, the metal forming the first and second outer members and the light source mounting member includes iron and its alloys, metals having higher thermal conductivity than these, such as copper and its alloys, and lighter metals than iron and its alloys. For example, aluminum and its alloys can be used. In the present invention, as a configuration for further increasing the heat radiation area of the first and second outer members, it is possible to subject the outer peripheral surfaces of these outer members to knurling to make this surface rough. Instead of this, it is also possible to form radiating fins. Furthermore, the outer peripheral surfaces of the first and second outer members may be coated with a protective film for preventing rust. In this case, if the black protective film is coated, the outer surfaces of the first and second outer members are externally applied. It is preferable in that the heat radiation to can be further improved.

  In the present invention, the light-emitting element converts electric energy into light, and for example, a light-emitting diode (LED), also referred to as a semiconductor light-emitting element, can be suitably used, but an electric luminescence element (EL element) is used. It is also possible to use it. Further, the number of light emitting elements to be used may be one or more. In this invention, the light emitting element can be directly mounted on the surface of the light source mounting member so as to conduct heat directly, or the light emitting element is mounted on the light source substrate and the substrate is heated on the surface of the light source mounting member. It can also be mounted to conduct.

  In the present invention, the threaded portion of the first outer member can be formed by a female screw or a male screw, and the threaded portion of the threaded tube portion can also be a female screw or a male screw.

  According to the first aspect of the present invention, the heat generated by the light emitting element of the light source and conducted to the metal light source attachment member is conducted from the peripheral portion of the light source attachment member to the heat receiving surface of the first outer member, It can discharge | release to air | atmosphere from the surface of 1 outline member. In addition, the heat of the first outer member is conducted to the second outer member through the meshing portion of the threaded portion of the outer member and the screwed cylindrical portion of the second metal outer member. A part of the heat of the light source mounting member is also conducted to the second light source mounting member from the pressing portion in contact therewith. For this reason, in the 2nd outline member, heat can be mainly emitted in the atmosphere from the cover part. As described above, since the heat radiation area is increased by using the second outer member having the cover portion surrounding the light source, the temperature rise of the light emitting element of the light source can be effectively suppressed.

  When assembling the above heat dissipation path, first, the light source mounting member on which the light source is mounted is fitted into one end opening of the first outer member, and the peripheral portion of the light source mounting member is placed on the heat receiving surface of the first outer member. Make contact. Next, with the second outer member covering the light source mounting member while placing the light source inside the cover portion, the threaded tube portion of the second outer member is engaged with the screw portion of the first outer member. Just screw in.

  As the screwing progresses, the presser part presses the peripheral part of the light source mounting part, so that the peripheral part is strongly sandwiched between the presser part and the heat receiving surface so that the light source mounting member and the heat receiving surface can conduct heat. And the light source mounting member and the pressing portion are in close contact with each other so as to conduct heat. In the above assembly, neither a heating furnace nor a press-fitting device is used, and there is no need for bonding twice. This can be easily implemented by sequentially assembling the second outer member.

  According to the invention of claim 2, the height of the peripheral portion is made larger than the height of the screwing tube portion, and between the one end opening end portion of the first outer member and the tip of the screwing tube portion, A space communicating with a meshing portion between the screw portion and the screwed tube portion is formed, and the screw portion and the screwed tube portion are bonded with an adhesive.

  In this invention, the variation within the dimensional tolerances of the first and second outer members and the light source mounting member is absorbed by the space communicating with the meshing portion, and the peripheral portion of the light source mounting member is fixed to the holding portion and the heat receiving surface. Can be securely clamped between. In addition, since the engaging portion is bonded with an adhesive, there is no possibility that the engaging state is loosened and the above-described sandwiched state is loosened by the rotational operation force when the lamp is attached to and detached from the lamp socket. At the same time, when the meshing portion is bonded with an adhesive, excess adhesive can be stored in the space.

  According to the first aspect of the present invention, it is possible to provide a lamp that can effectively suppress the temperature rise of the light source and can easily make a heat conduction path from the light source to the outer member for heat dissipation.

  According to the second aspect of the present invention, it is possible to reliably hold the peripheral portion of the light source mounting member between the presser portion and the heat receiving surface, and to secure a space for accumulating an excess of the adhesive that ensures the maintenance of this state. Can provide a lamp.

  An embodiment of the present invention will be described with reference to FIGS.

  Reference numeral 1 in FIGS. 1 and 2 denotes a light bulb type lamp. The lamp 1 includes a first metal outer member 2, a light source assembly 11, a second metal outer member 41, a lighting circuit 51, an insulating member 55, and a base 61.

  The first outer member 2 is made of an integrally molded product such as an aluminum alloy or brass die-cast product. As shown in FIGS. 2 and 3, the first outer member 2 has a cylindrical shape with one end and the other end opened, and the diameter gradually decreases from one end to the other end. A screw part 3, an annular step part 4, a heat receiving surface 5, and a positioning part 6 are formed at the end part of the one end opening having a larger diameter than the other end opening.

  That is, as shown in FIG. 3 and FIG. 5 and the like, an annular step portion 4 that is recessed from the end face toward the other end opening is formed at the opening end portion of the one end. The annular wall extending from the annular step 4 to the opening end of one end forms a threaded portion 3, and for this purpose, for example, the inner peripheral portion of the annular wall is provided with a female thread. Therefore, when the first outer member 2 is viewed from the front, the screw portion 3 surrounds the annular step portion 4. An annular auxiliary groove 4a that opens to the front surface and the inner peripheral surface of the first outer member 2 is formed in the inner peripheral portion of the annular step portion 4, and the inner surface that forms the bottom of the auxiliary groove 4a has a heat receiving surface. Surface 5 is formed. In the present invention, the auxiliary groove 4a can be omitted and the annular step 4 itself can be used as a heat receiving surface. As shown in FIG. 2, the first outer member 2 is provided with a portion 2 a that does not change its inner diameter continuously with the annular step 4.

  As shown in FIG. 3, the positioning part 6 is formed in the annular step part 4 avoiding the auxiliary groove 4a. One or more positioning portions 6 may be provided, and a plurality of positioning portions 6 are provided at positions separated by, for example, 180 degrees. Although the illustrated positioning portion 6 is formed by a protrusion, it can be formed by a concave portion instead.

  As shown in FIG. 2, the light source assembly 11 includes a metal light source mounting member 12, a light source 21, a heat transfer sheet 30, and a light source cover 32, and these are assembled and formed.

  The light source mounting member 12 is made of, for example, an integrally molded product such as an aluminum alloy or brass die-cast product, or a press-molded product. As shown in FIGS. 3 and 4, the light source mounting member 12 has a circular shape when viewed from the front, and the peripheral portion 12 a has a peripheral wall 12 b protruding from the back surface. The peripheral wall 12b is preferably continuous in an annular shape without a break, but may be partially interrupted.

  The light source mounting member 12 is provided with a plurality of, for example, two connecting holes 13, two through-holes 14, and a plurality of, for example, two positioning projections 15. The paired holes or the positioning projections are separated from each other by 180 degrees. The positioning convex portion 15 is formed of a cylindrical pin and protrudes from the surface of the light source mounting member 12 at a right angle.

  As shown in FIGS. 3 and 4, the peripheral wall 12 b is provided with one or more, for example, a plurality, specifically two, anti-rotation receiving portions 16 fitted to the positioning portion 6. These anti-rotation receiving portions 16 are formed, for example, as recesses that open to the front end surface of the peripheral wall 12b. However, when the positioning portion 6 is formed of a concave portion, the anti-rotation receiving portion 16 is formed by the convex portion.

  The light source mounting member 12 is disposed by fitting the peripheral wall 12b into the auxiliary groove 4a so that the distal end of the peripheral wall 12a abuts the heat receiving surface 5 and closes one end opening of the first outer member 2. In this state, the positioning portion 6 and the anti-rotation receiving portion 16 are engaged with each other so that the light source mounting member 12 is prevented from rotating with respect to the first outer member 2.

  As shown in FIGS. 2 and 4, the light source 21 is formed by disposing a light source substrate 23 on the surface of the base 22. The base 22 is made of aluminum. A chip-like light emitting element 24 is mounted at the center of the light source substrate 23. An LED is used for the light emitting element 24. The light emitting element 24 is sealed with a hemispherical transparent protective glass 25. The surface of the light source substrate 23 is insulated by an insulating layer (not shown) by exposing the transparent protective glass 25 and a plurality of lands provided around the transparent protective glass 25 at equal intervals in the circumferential direction.

  The light source 21 is provided with two wire passage portions 27 spaced apart by 180 degrees along the circumferential direction of the light source 21, and the two anti-rotation engaging portions 28 are spaced 180 degrees along the circumferential direction of the light source 21. Furthermore, two through portions 29 are provided 180 degrees apart along the circumferential direction of the light source 21. The wire passage portion 27, the anti-rotation engagement portion 28, and the passage portion 29 are formed with U-shaped cutout grooves that open to the periphery of the light source 21, but may be formed with through holes.

  As shown in FIG. 2, the light source 21 is disposed on the center portion of the light source mounting member 12 with the base 22 facing the surface of the light source mounting member 12 and the heat transfer sheet 30 sandwiched between the surface 22 and the surface. . In this arrangement state, the positioning convex portion 15 is fitted to the pair of detent engagement portions 28. In order to prevent the light source 21 from rotating in the circumferential direction, the diameter of the positioning convex portion 15 made of a cylindrical pin and the width of the anti-rotation engaging portion 28 made of a groove are substantially the same, and the light source 21 is in the radial direction. In order not to move, the positioning convex portion 15 is fitted to the anti-rotation engaging portion 28 so as to contact the inner surface of the anti-rotation engaging portion 28. With such a rotation prevention, the light emitting element 24 is disposed on the central axis of the first outer member 2, the electric wire passing portion 27 and the passing hole 14 are communicated, and the passing portion 29 and the connecting hole 13 are communicated. In such a state, the light source 21 is positioned.

  The heat transfer sheet 30 is a sheet made of an elastic material excellent in thermal conductivity, and a silicon resin sheet can be suitably used. The heat transfer sheet 30 is larger than the light source 21. As shown in FIG. 4, escape portions 30 a to 30 f that are individually opposed to and communicate with the wire passage portion 27, the anti-rotation engagement portion 28, and the passage portion 29 of the light source 21 are provided on the peripheral portion of the heat transfer sheet 30. Is provided. These escape parts 30a-30f consist of a U-shaped groove | channel, for example.

  As shown in FIG. 2, the light source cover 32 is formed by combining, for example, a holder 33 and a light distribution control member having a light distribution control function, such as a lens 34. This configuration is preferable in that the holder 33 can be formed of a material different from the transparent material on which the lens 34 is molded.

  As shown in FIG. 6, the holder 33 has a pair of holder members 33a formed by molding an electrically insulating material such as a non-translucent synthetic resin into a semi-cylindrical shape. Are assembled by fitting them together. One end of the holder 33 in the axial direction forms a receiving portion 37, and the receiving portion 37 is provided with an engaging groove 38 that opens to the inner peripheral surface.

  The other axial end of the holder 33 forms an abutting portion 39 that comes into contact with the peripheral surface of the light source 21. The contact portion 39 is divided into a plurality along the circumferential direction of the holder 33 by a notch 33 b provided at the other axial end portion of the holder 33. Further, the same number of screw holes 40 as the through-holes 29 protrude from the holder 33.

  The lens 34 is integrally formed of a transparent synthetic resin or glass. For example, a conical reflecting surface 34a, an exit surface 34b, and a recess defined by an entrance surface 34c on the opposite side of the exit surface 34b. 34d, and a flange 34e projecting continuously in the circumferential direction at the end on the exit surface 34b side.

  The lens 34 is sandwiched between the pair of holder members 33 a by fitting the flange 34 e into the engagement groove 38, so that the emission surface 34 b is substantially flush with the receiving portion 37 and supported inside the holder 33. Has been.

  The light source cover 32 is disposed so as to cover the light source 21. That is, the light source 21 has a light source substrate 23 with a contact surface 39 that avoids each land, and a pair of screw holes 40 that are opposed to the passage portions 29 of the light source 21. Is arranged with respect to the light source 21. The light source cover 32 arranged so as to cover the light source 21 in this way is located with respect to the light source 21 so that the optical axis A (see FIG. 2) of the lens 34 coincides with the optical axis of the light emitting element 24 included in the light source 21. Is positioned. Further, in this positioning state, the protective glass 25 is accommodated in the concave portion 34d, and the notches 33b are respectively opposed to the electric wire passing portion 27 and the anti-rotation engaging portion 28.

  The light source mounting member 12, the light source 21, the heat transfer sheet 30, and the light source cover 32 combined as described above are connected by a connecting means, for example, two screws 26 to form the light source assembly 11. A countersunk screw can be suitably used for the screw 26. These screws 26 are inserted into the connection holes 13 and are screwed into the screw holes 40 through the escape portions 30 c or 30 d and the through portions 29. Thus, the light source 21 and the heat transfer sheet 30 are sandwiched between the light source mounting member 12 and the light source cover 32 so that the base 22 of the light source 21 is efficiently transferred to the light source mounting member 12 through the heat transfer sheet 30. Assembled.

  The second outer member 41 forms the outer shell of the lamp 1 together with the first outer member 2 to which the second outer member 41 is connected. The second outer member 41 is made of an integrally molded product such as an aluminum alloy or brass die-cast product. As shown in FIGS. 1 to 3, the second outer member 41 includes cover portions 42, 43, a pressing portion 44, and a screwed tube portion 45. One of the cover portions 42 and 43 can be omitted.

  The cover portion 42 is provided at the center of the second outer member 41 and is formed in a cylindrical shape having a length that can accommodate the light source 21, the heat transfer sheet 30, and the light source cover 32. The cover part 42 has an annular hook flange 42a projecting inwardly at the tip. The cover portion 43 is provided on the outer peripheral portion of the second outer member 41. Accordingly, the cover portions 42 and 43 surround the light source 21. The height of the outer cover portion 43 is lower than that of the inner cover portion 42, but this may be the same or higher. Further, these cover portions 42 and 43 may be integrally formed by filling the annular gap G between them. However, the presence of the annular gap G is preferable in that a larger area can be secured for heat radiation from the second outer member 41 to the atmosphere, and the lamp 1 can be reduced in weight.

  The pressing portion 44 is a portion that contacts at least the surface of the peripheral portion 12 a of the light source mounting member 12, and the cover portions 42 and 43 are integrally continued by the pressing portion 44. The threaded cylindrical portion 45 is integrally projected on the back surface of the presser portion 44, and the protruding height (length) extending in the axial direction is the protruding height extending in the axial direction of the peripheral wall 12 b of the light source mounting member 12. It is shorter than (length) and shorter than the protruding height of the screw part 3. The threaded cylinder portion 45 is formed by providing a male screw on the outer peripheral surface thereof, and is threadedly engaged with the threaded portion 3. In addition, when the thread part 3 has an external thread, the thread part of the screwing cylinder part 45 is formed with an internal thread.

  The second outer member 41 is connected to the first outer member 2 by screwing the threaded tube portion 45 into the screw portion 3 of the first outer member 2. In this connected state, the screw portion 3 and the cover portion 43 are in contact with each other without any gap, and their outer surfaces are flush with each other. In the connected state, the pressing portion 44 is pressed against the peripheral portion 12 a of the light source mounting member 12 and the front end surface of the peripheral wall 12 b is pressed against the heat receiving surface 5, and the peripheral wall is interposed between the heat receiving surface 5 and the pressing portion 44. A peripheral wall 12b of 12a is sandwiched. For this reason, the second outer member 41 functions as a mounting member for the light source assembly 11.

  Further, due to the difference in the protrusion height, a space S is formed between the annular step 4 formed at the opening end of the first outer member 2 and the tip of the screwed tube 45 as shown in FIG. Is formed. The space S is communicated with a small amount of play formed in the meshing portion between the screw portion 3 and the screwing tube portion 45. Then, an adhesive B (shown by a thick line in FIG. 5) is supplied to the play of the meshing portion, and the screw portion 3 and the screwed tube portion 45 are bonded by this adhesive B.

  The lighting circuit 51 is for making the light emitting element 24 of the light source 21 emit light. As shown in FIG. 2, various circuit components 53 are mounted on a circuit board 52 as a unit. The lighting circuit 51 has two insulation-coated wires (not shown) for electrical connection to the light source 21. Further, one end of the circuit board 52 is connected to the land of the light source 21, and the first outer member passes through the wire passage portion 27, the relief portion 30 a or 30 b, the passage hole 14, and the later-described wire passage hole 56. The other ends of the other two insulated wires (not shown) drawn out into 2 are connected.

  An insulating member 55 is accommodated in the first outer member 2. The insulating member 55 is formed of a synthetic resin such as polybutylene terephthalate. The lighting circuit 51 is accommodated inside the insulating member 55 in a posture in which the circuit board 52 is horizontally arranged. By accommodating such a lighting circuit 51, it is not necessary to secure a space for arranging the lighting circuit 51 in the axial direction of the first outer member 2, so that the axial length of the lamp 1 can be made compact.

  The insulating member 55 is intended to provide electrical and thermal insulation between the lighting circuit 51 and the first metal outer member 2. 3 are opened at two locations on the wall portion 55a of the insulating member 55 fitted to the back side of the light source mounting member 12. As shown in FIG. In FIG. 2, reference numeral 57 indicates a plurality of or annular circuit board receiving protrusions, and reference numeral 58 indicates a plurality of motion stop protrusions having oblique surfaces, which are integrally formed with the insulating member 55. The circuit board 52 is disposed between the movement-preventing protrusions 58 and the protrusions 57 by passing over the movement-preventing protrusions 58 and being accommodated in the insulating member 55. Thereby, the lighting circuit 51 arrange | positioned in the predetermined position in the insulating member 55 is hold | maintained in the state by which the fluctuation was suppressed.

  The base 61 for supplying power to the lighting circuit 51 is disposed on the opening end 2b side of the other end of the first outer member 2 as shown in FIG. As the base 61, for example, an E17 type is used. The base 61 has a base element 62 and a connecting member 63 fixed to the base element 62. The base element 62 has a spiral groove on the periphery thereof, and is detachably screwed into a lamp socket (not shown). The lamp 1 is usually mounted on a lamp socket (not shown) in a posture with the base 61 facing upward as shown in FIG. The connecting member 63 is made of an insulating material such as a synthetic resin such as polybutylene terephthalate, and is connected to the opening end 2b. The connecting member 63 is interposed between the base element 62 and the first outer member 2 to carry out the connection therebetween, and between the base element 62 and the first outer member 2 is electrically and thermally connected. Is electrically insulated.

  The lamp 1 is assembled by the following procedure, for example.

  The light source assembly 11 assembled in advance is prepared, and the insulation-coated electric wires drawn out from the light-source assembly 11 are passed through the wall portion 55a of the insulating member 55, and then these electric wires are connected to the circuit board 52 of the lighting circuit 51. Next, the lighting circuit 51 is inserted inside the insulating member 55, and the circuit board 52 is held between the movement stop protrusion 58 and the protrusion 57.

  Thereafter, the insulating member 55 is accommodated in the first outer member 2 through the large diameter one end opening. At this time, the insulated wire drawn out from the circuit board 52 is drawn out from the small-diameter other end opening of the first outer member 2 and placed. Further, as the insulating member 55 is accommodated, the peripheral portion 12 a of the light source mounting member 12, specifically, the distal end portion of the peripheral wall 12 b is inserted into the auxiliary groove 4 a of the first outer member 2. At this time, the rotation receiving portions 16 formed on the peripheral wall 12b are fitted to the positioning portions 6 protruding from the annular step portion 4, respectively, so that the light source assembly 11 is inadvertently rotated with respect to the first outer member 2. Position so that there is no.

  Next, in this state, the second outer member 41 is disposed so as to cover the large diameter one end opening side of the first outer member 2, and the light source 21, the heat transfer sheet 30, And the light source cover 32 is accommodated. Thereafter, the second outer member 41 is rotated by hand, and the screwed tube portion 45 is screwed into the screw portion 3 of the first outer member 2, so that the second outer member 41 and the first outer member 2. And

  Accordingly, at the end of screwing, the pressing portion 44 presses the surface of the peripheral portion 12a of the light source mounting member 12 and is brought into close contact with the surface, and the peripheral wall 12b is pressed against the heat receiving surface 5 to bring them into close contact with each other. The peripheral portion 12 a of the light source mounting member 12 is sandwiched between the pressing portion 44 of the second outer member 41 and the heat receiving surface 5 of the first outer member 2. In this case, since the space S is formed between the annular stepped portion 4 and the screwing tube portion 45, the screwing tube portion 45 serves as a stopper before the screwing tube portion 45 is pressed against the heat receiving surface 5. There is no end. For this reason, the 2nd outer member 41 is screwed in sufficiently and sufficiently, and the said close state can be obtained reliably.

  Further, in the state where the screwing of the second outer member 41 is completed, as shown in FIG. 2, the hooking flange 42 a of the inner cover portion 42 is hooked on the front end surface of the holder 33, and the light source cover 32 is attached to the light source mounting member 12. Press towards. Thereby, the base 22 of the light source 21 can be brought into close contact with the surface of the light source mounting member 12 through the heat transfer sheet 30 more reliably.

  At the end of the screwing, the pressing portion 44 applies a rotational force to the light source mounting member 12. However, the rotation of the light source assembly 11 is prevented by using the positioning portion 6 and the anti-rotation receiving portion 16 fitted to each other as a stopper. For this reason, the light source assembly 11 rotates and the insulation coated electric wire extending over the light source 21 and the lighting circuit 51 is twisted, and there is no fear that the electric wire is cut or peeled off from the connection portion of the insulation coated electric wire.

  Further, the above screwing is performed after previously applying an uncured adhesive B to at least one of the screwed tube portion 45 or the screw portion 3. As a result, the adhesive B is filled in the meshing portion between the threaded cylinder portion 45 and the screw portion 3 and bonds them together. At this time, the excess of the adhesive B is accommodated in a space S formed between the annular step portion 4 and the screwed tube portion 45. For this reason, it can suppress that the excess adhesive agent B leaks to the outer surface from the joint line of the 1st outline member 2 and the 2nd outline member 41. FIG. And, by this adhesion, when the lamp 1 is rotated after assembly and the detachment operation to the lamp socket (not shown) is performed, there is no possibility that the screwing of the second outer member 41 to the first outer member 2 is loosened. It is possible to maintain the heat dissipation performance by heat conduction described later.

  Finally, after soldering the insulated coated wires drawn from the first outer member 2 to the predetermined positions of the base elements of the base 61, the base 61 is placed on the small diameter opening end of the first outer member 2. Install. Thereby, the assembly of the lamp 1 is completed.

  According to such assembly, there is no need to use a heating furnace or a press-fitting device, and it is not necessary to bond twice, as described above, on the one end opening side of the first outer member 2. The lamp 1 is easily assembled by sequentially assembling the light source assembly 11 having the light source mounting member 12 and the second outer member 41 from the same direction, and the first outer member 2 and the first outer member 2 from the light source 21 to the lamp 1. A heat conduction path for heat radiation to the two outer members 41 can be created. Since the light source assembly 11 is assembled from the opening side opposite to the base 61 as described above, the outer periphery of the lamp 1 can be made smaller in diameter toward the base 61 side as shown in FIGS. For this reason, in the attachment of the lamp 1 to the luminaire, the outer portion around the base of the lamp 1 is prevented from becoming an obstacle, and the fitting rate of the lamp 1 can be improved.

  When the lamp 1 is turned on, light emitted from the light emitting element 24 made of LED is controlled as, for example, spot light by the lens 34 and projected downward. At the time of this lighting, the light emitting element 24 made of LED generates heat. The heat is efficiently conducted from the base 22 of the light source 21 to the light source mounting member 12 through the heat transfer sheet 30, and then the first outer member 2 and the second outer member that form the outer periphery of the lamp 1 from the light source mounting member 12. Conducted to the outer member 41 and released from these surfaces into the atmosphere.

  That is, the heat generated by the light emitting element 24 and conducted to the metal light source attachment member 12 is conducted from the peripheral portion 12a of the light source attachment member 12 to the heat receiving surface 5 of the first outer member 2, and this first From the surface of the outer shell member 2 to the atmosphere. In this case, since the front end surface of the peripheral wall 12b of the peripheral portion 12a is in close contact with the heat receiving surface 5, heat conduction from the light source mounting member 12 to the first outer member 2 is good. Moreover, since the tip of the peripheral wall 12b is provided so as to contact the inner peripheral surface of the auxiliary groove 4a in which it is fitted, the heat transfer area from the peripheral wall 12b to the first outer member 2 is large. However, the heat conduction to the first outer member 2 is good.

  In addition to this, the heat of the first outer member 2 passes through the meshing portion between the screw portion 3 of the first outer member 2 and the threaded tube portion 45 of the metal second outer member 41. Conducted to the outer member 41. Further, on the other hand, part of the heat of the light source mounting member 12 is conducted to the second outer member 41 through the holding portion 44 that is in close contact with the surface of at least the peripheral portion 12 a of the light source mounting member 12. The second outer member 41 emits heat mainly from the surfaces of the cover portions 42 and 43 to the atmosphere.

  Since the heat dissipation area is increased by using the second outer member 41 having the cover portions 42 and 43 surrounding the light source 21 as described above, the heat dissipation performance is improved and the temperature rise of the light emitting element 24 is effectively increased. Can be suppressed. Therefore, the temperature of the light emitting element 24 of the light source 21 is suppressed from rising abnormally, and the light emission efficiency and the life of the light emitting element 24 can be suppressed from decreasing.

The perspective view which shows the lamp | ramp which concerns on one Embodiment of this invention. Sectional drawing which shows the lamp | ramp of FIG. The perspective view which decomposes | disassembles and shows the 1st, 2nd outline member with which the lamp | ramp of FIG. 1 is equipped, an insulating member, and a light source attachment member. The perspective view which decomposes | disassembles and shows the light source attachment member with which the lamp | ramp of FIG. 1 is equipped, a heat-transfer sheet | seat, and a light source. Sectional drawing which expands and shows the F5 part in FIG. The perspective view which decomposes | disassembles and shows the light source cover with which the lamp | ramp of FIG. 1 is provided.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lamp, 2 ... 1st outer member, 3 ... Screw part, 4 ... Annular step part, 5 ... Heat-receiving surface, 11 ... Light source assembly, 12 ... Light source attachment member, 12a ... Peripheral part, 12b ... Peripheral wall, 21 ... Light source, 24 ... light emitting element, 32 ... light source cover, 41 ... second outer member, 42, 43 ... cover portion, 44 ... pressing portion, 45 ... screwed tube portion, 51 ... lighting circuit, 61 ... base, B ... Adhesive, S ... space

Claims (2)

A metal first outer member having one end opened, a heat receiving surface and a screw portion surrounding the heat receiving surface formed at an end of the opening, and a lighting circuit accommodated therein;
A base disposed on the other end side of the outer member;
A metal light source mounting member having a peripheral portion in contact with the heat receiving surface and disposed with the one end opening closed;
A light source having a light emitting element and mounted on the surface of the light source mounting member so as to conduct heat to the light source mounting member;
A cylindrical cover portion surrounding the light source; a presser portion in contact with a peripheral surface of the light source mounting member positioned around the light source; and a threaded tube portion screwed into the screw portion. And a metal second outer member connected to the first outer member by sandwiching between the first outer member and the heat receiving surface;
A lamp comprising:   The height of the peripheral portion is made larger than the height of the threaded tube portion, and the threaded portion and the threaded tube are disposed between one end opening end portion of the first outer member and the front end of the threaded tube portion. The lamp according to claim 1, wherein a space communicating with a meshing portion with the portion is formed, and the screw portion and the screwed cylindrical portion are bonded with an adhesive.

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