AU2014233650B2

AU2014233650B2 - Lamp and optical component

Info

Publication number: AU2014233650B2
Application number: AU2014233650A
Authority: AU
Inventors: Hiroyuki Banba; Kenji Kawajiri; Shigeaki Kimura; Fuyu Mizutani; Tadashi Omuro; Takahito Shimizu; Koji Uchida; Yuya Yamazaki
Original assignee: Iwasaki Denki KK
Current assignee: Iwasaki Denki KK
Priority date: 2010-08-11
Filing date: 2014-09-29
Publication date: 2015-07-30
Anticipated expiration: 2031-08-11
Also published as: AU2014233650A1; AU2011290165A1; NZ607838A; WO2012020830A1; AU2011290165B2

Abstract

LAMP AND OPTICAL COMPONENT A lamp comprising: a board on which light emitting elements (15) are mounted; a flat plate portion (13) on which the board is mounted; a cylinder portion (2) that extends from the back surface of the flat plate portion and is provided with a base at a terminal thereof; and an electrical circuit board (8) that is accommodated in the cylinder portion and on which electrical circuit components for turning on the light emitting elements are mounted, wherein a plurality of heat radiation fins extending from the back surface of the flat plate portion through the cylinder portion (2) to the terminal side are provided, end portions at the terminal side of the heat radiation fins are located to be far away from the base to the flat plate portion side, and a gap is provided between each of the heat radiation fins and an outer peripheral surface of the cylinder portion from a root portion of the heat radiation fin to the end portion at the terminal side thereof. 9132257_1

Description

1 DESCRIPTION LAMP AND OPTICAL COMPONENT Related Applications [0001] This application is a divisional application of Australian Patent Application No. 2011290165, a national phase entry of PCT/JP2011/068394, filed on 11 August 2011, which ultimately claims priority from Japanese Patent Application Nos. 2010-180593, 2010-270820, 2010-270821, 2010-270833, 2011-157669, and 2011-157670. Australian Patent Application No. 2011290165, International Patent Application No. PCT/JP2011/068394, and Japanese Patent Application Nos. 2010-180593, 2010-270820, 2010 270821, 2010-270833, 2011-157669, and 2011-157670 are incorporated herein by reference in their entirety. Technical Field [0001a] The present invention relates to a lamp for lighting with light emitted from a light emitting element such as an LED or the like, and an optical component used in the lamp, for example. Background [0002] A bulb-type LED lamp usable as an alternative to an electrical bulb has become popular in connection with increase of output power and reduction of cost of LEDs. This type of LED is generally configured so that an LED mount board having LEDs mounted thereon is mounted on a flat disc plate, a hollow cylindrical portion is connected to the back surface of the flat discplate and a base is provided to the terminal of the cylindrical portion through an insulating portion (see Patent Document 1, Patent Document 2 and Patent Document 3, for example). Various kinds of techniques of radiating heat by providing plural heat radiation fins in order to prevent deterioration of LEDs and reduction of light amount due to heat generation of LEDs have been known with respect to LED lamps. For example, there are known a technique in which many heat radiation fins 9131748_3 la extending from the flat disc plate to the insulating portion of the base are formed on the outer peripheral surface of the cylindrical portion of the LED lamp to radiate heat (see Patent Document 4, for example), and a technique in which the flat disc 9131748_3 2 plate is secured to a thermal conductor expanding in a light emission direction and plural heat radiation fins are provided to an opening end in the light emission direction of the thermal conductor (see Patent Document 5, for example). Prior Art Document Patent Document [0003] Patent Document 1: JP-A-2010-010134 Patent Document 2: JP-A-2009-206104 Patent Document 3: JP-A-2011-60754 Patent Document 4: Japanese Utility Model Registration No. 3,156,563 Patent Document 5: JP-A-2010-73569 [0004] However, an electrical circuit board having electrical circuit components such as a lighting circuit, etc. mounted thereon is contained in the cylindrical portion of the LED lamp, and the construction of the Patent Document 4 has a problem that generated heat of the LEDs is radiated while transferred to the cylindrical portion, so that the electrical circuit board accommodated in the cylindrical portion is thermally affected. On the other hand, according to the Patent Document 5, the thermal effect to the cylindrical portion can be suppressed. However, since the light emission end side of the LED lamp is larger in width by the amount corresponding to the heat radiation 9131748_3 3 fins, there is a problem that the size of the LED lamp in plan view is larger than the actual mounting area of the mounted LEOs, so that the cost increases because the structure is complicated. [0005] A need exists to provide a lamp that can suppress an electrical circuit board accommodated in a cylindrical portion from being thermally affected by heat radiation of LEDs, and an optical component used in the lamp. [0006] This specification contains all the contents of Japanese Patent application NO. 2010-180593 filed on August 11, 2010, Japanese Patent Application Nos. 2010-270820, 2010-270821 and 2010-270833 filed on December 3, 2010, and Japanese Patent Application Nos. 2011-157669 and 2011-157670 filed on July 19, 2011. In some arrangements, a lamp according to the present disclosure is characterized by comprising: a board on which light emitting elements are mounted; a flat plate portion on which the board is mounted; a cylinder portion that extends from the back surface of the flat plate portion and is provided with a base at a terminal thereof; and an electrical circuit board that is accommodated in the cylinder portion and on which electrical circuit components for turning on the light emitting elements are mounted, wherein a plurality of heat radiation fins extending from the back surface of the flat plate portion through 9131748_3 4 the cylinder portion to the terminal side are provided, and end portions at the terminal side of the heat radiation fins are located to be far away from the base to the flat plate portion side. [0007] A lamp according to a second arrangement is characterized in that, in the lamp according to the first arrangement, a gap is provided between each of the heat radiation fins and an outer peripheral surface of the cylinder portion from a root portion of the heat radiation fin to the end portion at the terminal side thereof. [0008] A lamp of a third arrangement is characterized in that, in the lamp of the first or second arrangement, the cylinder portion is formed through two-color molding or insert molding by using a resin material having high thermal conductivity for the flat plate portion side of the cylinder portion and a resin material having insulating properties for the terminal side of the cylinder portion. [0009] A lamp according to a fourth arrangement is characterized in that, in the lamp of the first or second arrangement, an intermediate portion of the cylinder portion between each of the heat radiation fins and the base is configured to have a conical shape tapered to the terminal, the cylinder portion is inserted in an opening portion of a lamp holder disposed outdoors, a waterproof packing is mounted on the cylinder portion, an inner peripheral portion of the waterproof packing is configured in conical shape so as to be fitted to the intermediate portion, the inner peripheral 9131748_3 5 portion of the waterproof packing is fitted to the intermediate portion of the cylinder portion when the waterproof packing is mounted, and an outer peripheral portion of the waterproof packing is engaged with an opening edge portion of the lamp holder to form a waterproof structure. [0010] A lamp according to a fifth arrangement is characterized in that, in the lamp of the first or second arrangement, a wire hole through which an anti-drop wire is passed is provided to some of the heat radiation fins. [0011] A lamp according to a sixth arrangement is characterized in that in the lamp of the first or second arrangement, a tip of the cylinder portion is opened in the plane of the flat plate portion, the electrical circuit board is inserted from the opening, a fixing groove portion for pinching a lower end portion of the electrical circuit board and an abutting piece against which one side of the electrical circuit board at a side confronting the lower end portion pinched in the fixing groove portion abuts are provided in the cylinder portion, and the electrical circuit board inserted from the opening is fixed by the pinching of the lower end portion in the fixing groove portion and the abutting of the abutting piece. [0012] A lamp according to a seventh arrangement is characterized in that the lamp of the sixth arrangement further comprises a bush that is provided between the electrical circuit board accommodated in the cylinder portion and the back surface of the board mounted 9131748_3 6 on the flat plate portion, pressed against the back surface of the board to come into contact with the electrical circuit board, and transfers heat of the electrical circuit board to the cylinder portion. [0013] A lamp according to an eighth arrangement is characterized in that, in the lamp of the first or second arrangement, the inner side surface of the cylinder portion is covered by an insulating sheet. [0014] An optical component according to a a ninth arrangement is characterized that it is provided to the lamp of the first or second arrangement, and concentrates and distributes light of a plurality of light emitting elements provided to the lamp in a predetermined range, wherein an optical element which is integrally provided with a lens for converging light incident from an incidence face and emitting the converged light from an emission face, and a reflection face for reflecting light deflected from the incidence face to the emission face side is provided every light emitting element, and the reflection faces of the adjacent optical elements are overlapped with each other. [0015] A lamp according to a tenth arrangement is characterized in that, in the lamp of the first or second arrangement, the inner diameter of the cylinder portion is set to be substantially equal to the width of the electrical circuit board. [0016] A lamp according to an eleventh arrangement is characterized in that, in the lamp of the first or second arrangement, a step portion is provided between the heat radiation fin and the base, the 9131748_3 7 intermediate portion at the terminal side is formed in a cylindrical shape having substantially perfect circle, the cylinder portion is inserted into an opening portion of a lamp holder disposed outdoors, a waterproof packing is mounted on the cylinder portion, the inner peripheral portion of the waterproof packing is formed to be fitted to the intermediate portion of the cylinder portion, the waterproof packing is pinched between the step portion of the cylinder portion and the opening edge portion of the lamp holder when the waterproof packing is mounted, the inner peripheral portion of the waterproof packing is fitted to the intermediate portion of the cylinder portion , and the outer peripheral portion of the waterproof packing is engaged with the opening edge portion of the lamp holder to thereby form a water proof structure. [0017] A lamp of a twelfth arrangement is characterized in that in the lamp of the fourth or eleventh arrangement, the waterproof packing is configured annularly, and the end portions at the terminal side of the heat radiation fins are blocked. [0018] A lamp of a thirteenth arrangement is characterized in that, in the lamp of the first or second arrangement, the base has a cylindrical shell on which a spiral groove engaged with a socket formed of an electrically conductive material is formed, and an insulating portion for electrically insulating the cylinder portion and the shell from each other is provided at the opening end of the shell. 9131748_3 8 [0019] A lamp of a fourteenth arrangement is characterized in that, in the lamp of the second arrangement, a reinforcing rib is provided from the root portion of the heat radiation fin to the end portion at the terminal side thereof. [0020] A fifteenth arrangement is characterized in that, in the lamp of the fourth or eleventh arrangement, the outer peripheral portion of the waterproof packing is pressed against the opening edge portion of the lamp holder by the heat radiation fins, thereby crushing the outer peripheral portion of the waterproof packing. [0021] A sixteenth arrangement is characterized in that, in the fourth or eleventh arrangement, an annular lip portion projecting inwards in the radial direction is formed on the inner peripheral surface of the waterproof packing. [0022] A lamp of a seventeenth arrangement is characterized in that, in the lamp of the fourth or eleventh arrangement, an annular groove portion is provided on the upper surface of the waterproof packing so as to make a circuit of the upper surface, and a drain portion through which the annular groove portion intercommunicates with the outer peripheral surface of the waterproof packing is formed. [0023] A lamp of an eighteenth arrangement is characterized in that, in the lamp of the first or second arrangement, the boar is formed of a resin board having a thickness which brings predetermined insulation, a heat radiation layer formed of a material having electrical conductivity is provided to each of a mount surface of the light emitting elements and the back surface 9131748_3 9 from which heat is transferred to the flat plate portion, a power source is connected to the heat radiation layer and slits are formed on the light emitting element mount surface to divide the mount surface to electrically conductive areas, and the light emitting elements are arranged so as to straddle over the slits, thereby electrically connecting the light emitting elements to the respective electrically conductive areas. [0024] A lamp of a nineteenth arrangement is characterized in that, in the lamp of the eighteenth arrangement, the slits are radially formed in the heat radiation layer at the mount surface side, and the light emitting element to each slit. [0025] A lamp of a twentieth arrangement is characterized in that, in the lamp of the eighteenth arrangement, an exposure portion to which the board is exposed is provided at the place corresponding to the electrical circuit board out of the heat radiation layer provided to the back surface of the board. [0026] A lamp of a twenty first arrangement is characterized in that, in the lamp of the eighteenth arrangement, the top of the cylinder portion is opened in the plane of the flat plate portion, the electrical circuit board is inserted from the opening, the insulating sheet having flexibility is formed like a band, the insulating sheet is rolled and inserted from the opening into the cylinder portion, and the insulating sheet is mounted on the inner side surface of the cylinder portion by unrolling of the insulating sheet. 9131748_3 10 [0027] A lamp of a twenty second arrangement is characterized in that, in the lamp of the eighth arrangement, the insulating sheet has high thermal conductivity, and a thermally conductive material is provided between the insulating sheet and the electrical circuit board, whereby heat of the electrical circuit board is conducted through the insulating sheet to the cylinder portion. (0028] A lamp of a twenty third arrangement is characterized in that, in the lamp of the twenty second arrangement, a circuit part as a cooling target and the thermal conductive material are arranged in a range in which the heat radiation fins extend. [0029] An optical component of a twenty fourth arrangement is characterized in that, in the optical part of the ninth arrangement, a plate-like light transmissible member which integrally covers each of the optical elements is provided to the emission face of each of the optical element. [0029a] A further aspect provides a lamp comprising: a board on which light emitting elements are mounted; a flat plate portion on which the board is mounted; a cylinder portion that extends from the back surface of the flat plate portion and is provided with a base at a terminal thereof; and an electrical circuit board that is accommodated in the cylinder portion and on which electrical circuit components for turning on the light emitting elements are mounted, wherein a plurality of heat radiation fins extending from the back surface of the flat plate portion through the cylinder portion to the terminal side are provided, end portions at the terminal side of the heat radiation fins are located to be far away from the base to the flat plate portion side, and a gap is provided between each of the heat radiation fins and an outer peripheral surface of the cylinder portion from a root portion of the heat radiation fin to the end portion at the terminal side thereof. [0029b] A yet further aspect provides an optical component 9131748_3 10a that is provided to the lamp of the above aspect and concentrates and distributes light of a plurality of light emitting elements provided to the lamp in a predetermined range, wherein an optical element which is integrally provided with a lens for converging light incident from an incidence face and emitting the converged light from an emission face, and a reflection face for reflecting light deflected from the incidence face to the emission face side is provided every light emitting element, and the reflection faces of the adjacent optical elements are overlapped with each other. [0030] According to the present invention, the end portions of the heat radiation fins are arranged away from the base of the terminal of the cylinder portion to the flat plate portion side. Therefore, a portion which the heat radiation fins do not reach is formed therefore, most of heat generated from the light emitting elements is transferred to the heat radiation fins provided in the neighborhood of the light emitting elements and radiated to the outside. Therefore, at the portion which the 9131748_3 - 11 heat radiation fins do not reach at the terminal side of the cylinder portion, the influence of the generated heat of the light emitting elements is little, and thermal influence on the electrical circuit board can be reduced and the electrical circuit components can be protected at that portion. Brief Description of the Drawings [0031] [Fig. 1] Fig. 1 is a perspective view showing the exterior appearance construction of an LED lamp according to a first embodiment of the present invention, wherein (A) is an exterior appearance perspective view taken from the upper side, and (B) is an exterior appearance perspective view taken from the lower side. [Fig. 2] Fig. 2 is a diagram showing the exterior appearance construction of the LED lamp, wherein (A) is a plan view, (B) is a side view and (C) is a bottom view. [Fig. 3] Fig. 3 is a cross-sectional view showing the internal construction of the LED lamp. [Fig. 4] Fig. 4 is an exploded cross-sectional view of the LED lamp. [Fig. 5] Fig. 5 is a diagram showing a mount style of an electrical circuit board. [Fig. 6] Fig. 6 is a diagram showing a state that the LED lamp is mounted in an existing lamp holder in which any of an existing electric bulb and an LED lamp 1 can be mounted, wherein (A) is an overall view, and (B) is an enlarged view of an X portion - 12 in (A). [Fig. 7] Fig. 7 is a cross-sectional view showing the construction of a body portion according to a second embodiment of the present invention. [Fig. 8] Fig. 8 is a cross-sectional view showing the construction of a body portion according to a third embodiment of the present invention. [Fig. 9] Fig. 9 is a cross-sectional view showing the construction of an LED lamp according to a fourth embodiment of the present invention. [Fig. 10] is a perspective view showing the exterior appearance construction of an LED lamp according to a fifth embodiment according to the present invention, wherein (A) is an exterior appearance perspective view taken from the upper side, and (B) is an exterior appearance perspective view taken from the lower side. [Fig. 11] Fig. 11 is a diagram showing the exterior appearance construction of the LED lamp, wherein (A) is a plan view, (B) is a side view and (C) is a bottom view. [Fig. 12] Fig. 12 is an exploded perspective view showing the LED lamp. [Fig. 13] Fig. 13 is an exploded front view of the LED lamp. [Fig. 14] Fig. 14 is a cross-sectional view showing the internal construction of the LED lamp.

- 13 [Fig. 15] Fig. 15 is a diagram showing the fitting structure between the LED lamp and a waterproof socket. [Fig. 16] Fig. 16 is an enlarged view showing the terminal of an insulating cylindrical portion. [Fig. 17] Fig. 17 is a plan view of a base plate. [Fig. 18] Fig. 18 is a diagram showing the construction of an insulating sheet, wherein (A) is a plan view, (B) is a plan view when the insulating sheet is mounted on the body portion, and (C) is a side view when the insulating sheet is mounted on the body portion. [Fig. 19] Fig. 19 is a diagram showing the fitting relationship of an electrical circuit board, a fixing bush and an LED board. [Fig. 20] Fig. 20 is a diagram showing the construction of the fixing bush, wherein (A) is an overall perspective view, (B) is a front view, (C) is a side view, (D) is a plan view and (E) is a bottom view. [Fig. 21] Fig. 21 is a diagram showing the construction of the LED board, wherein (A) is a plan view taken when the LED mounted surface side is viewed, (B) is a side view and (C) is a bottom view taken when the back surface side is viewed. [Fig. 22] Fig. 22 is a diagram showing the construction of an LED board according to another embodiment. [Fig. 23] Fig. 23 is an exploded perspective view showing the exterior appearance construction of an LED lamp device.

- 14 [Fig. 24] Fig. 24 is a cross-sectional view showing the LED lamp device. [Fig. 25] Fig. 25 is a cross-sectional view showing a state that an existing electrical bulb lamp is mounted in a lamp holder. [Fig. 26] Fig. 26isadiagramshowinganannularwaterproof packing, wherein (A) is a plan view and (B) is a cross-sectional view taken along IX - IX of (A). [Fig. 27] Fig. 27 is an enlarged view of a neighboring portion of the annular waterproof packing of Fig. 26. [Fig. 28] Fig. 28 isacross-sectional view showing another shape of a heat radiation fin according to a fifth embodiment. [Fig. 29] Fig. 29 is a cross-sectional view showing the internal construction of an LED lamp device according to a sixth embodiment. [Fig. 30] is a cross-sectional view showing another shape of the body portion in the sixth embodiment. [Fig. 31] is a cross-sectional view showing the internal construction of an LED lamp device according to a seventh embodiment. [Fig. 32] Fig. 32 is a cross-sectional view showing the construction that a curved surface portion is provided to a press plate of the seventh embodiment. [Fig. 33] Fig. 33 is a cross-sectional view showing the construction that the curved surface portion is provided to the press plate of the seventh embodiment.

- 15 [Fig. 34] Fig. 34 is a cross-sectional view showing the construction that an annular waterproof packing is used in the seventh embodiment. [Fig. 35] Fig. 35 is an enlarged cross-sectional view showing a fitting portion of an annular waterproof packing in an eighth embodiment. [Fig. 36] Fig. 36 is a diagram showing an LED lamp device having an LED lamp according to a ninth embodiment of the present invention. [Fig. 37] Fig. 37 isaperspectiveview showingthe exterior appearance construction of the LED lamp, wherein (A) is an exterior appearance perspective view taken from the upper side, and (B) is an exterior appearance perspective view taken from the lower side. [Fig. 38] Fig. 38 is a diagram showing the exterior appearance construction of the LED lamp, wherein (A) is a plan view, (B) is a side view and (C) is a bottom view. [Fig. 39] Fig. 39 is a perspective view taken from the upper side when the LED lamp is exploded. [Fig. 40] Fig. 40 is a perspective view taken from the lower side when the LED lamp is exploded. [Fig. 41] Fig. 41 is a cross-sectional view taken along 1-1 line of Fig. 38(B). [Fig. 42] Fig. 42 is a diagram showing the construction of an optical component for a beam lamp, wherein (A) is a plan - 16 view, (B) is a side view and (C) is a bottom view. [Fig. 43] Fig. 43 is a diagram showing the construction of a concentrated light distributing optical element. [Fig. 44] Fig. 44 is alight beam diagram showing the action of adjacent concentrated light distributing optical elements. [Fig. 45] Fig. 45 is a diagram showing the amount of lap of the adjacent concentrated light distributing elements. [Fig. 46] Fig. 46 is a diagram showing the amount of the lap of the adjacent concentrated light distributing elements. [Fig. 47] Fig. 47 is a diagram showing the exterior appearance construction of an LED lamp according to a tenth embodiment of the present invention, wherein (A) is a plan view, (B) is a side view and (C) is a bottom view. [Fig. 48] Fig. 48 is a perspective view taken from the upper side when the LED lamp is exploded. [Fig. 49] Fig. 49 is a perspective view taken from the lower side when the LED lamp is exploded. [Fig. 50] Fig. 50 is a cross-sectional view taken along I-I line of Fig. 47(B). Best Modes for carrying out the Invention [0032] Embodiments of the present invention will be hereunder described with reference to the drawings. In the following embodiments, an LED lamp having LEDs as light sources is exemplified as a lamp having light emitting elements as light sources. However, the present invention is not limited to these - 17 embodiments, and the present invention may be applied to a lamp having other light emitting elements such as organic ELs or the like as light sources, for example. [0033] <First Embodiment> Fig. 1 is aperspectiveview showingthe exteriorappearance construction of an LED lamp 1 according to an embodiment. Fig. 1 (A) is a perspective view of the exterior appearance taken from the upper side, and Fig. 1(B) is aperspective view of the exterior appearance taken from the lower side. Fig. 2 is a diagram showing the exterior appearance construction of the LED lamp 1, wherein Fig. 2 (A) is a plan view, Fig. 2 (B) is a side view and Fig. 2 (C) is a bottom view. Fig. 3 is a cross-sectional view showing the internal construction of the LED lamp 1. Fig. 4 is a cross-sectional view showing an exploded LED lamp 1. As shown in these figures, the LED lamp 1 is configured so as to have substantially the same shape and optical characteristic as an existing electric bulb, and usable as an alternative to the existing electric bulb. [0034] Thatis, the LED lamp 1 has abodyportion 2 as a cylindrical portion which is formed of material having high thermal conductivity and configured in a hollow cylindrical shape, and a base 3 which can be mounted in an existing socket is provided to the terminal 2A (Fig. 3, Fig. 4) thereof. Specifically, the base 3 has a cylindrical shell which is threaded so as to be screwed to an existing socket, and an eyelet which is provided - 18 to the apex portion of an end portion of the shell 5 through an insulating portion 6. As shown in Fig. 3 and Fig. 4, the body portion 2 contains an electrical circuit board 8 on which electrical circuits such as a lighting circuit, etc. are mounted, and the shell 5 of the base 3 and the eyelet 7 are electrically connected to the electrical circuit board 8 through lead wires 9A and 9B respectively, whereby the electrical circuit board 8 is supplied with power from the socket. [00351 Furthermore, inthebase3, an insulating cylinderportion 10 is provided continuously with the opening end side of the shell 5, and a metal mount portion 11 to be mounted on the terminal 2A of the body portion 2 is provided continuously with the insulating cylinder portion 10. The insulating cylinder portion 10 of the base 3 serves to electrically insulate the shell 5 and the body portion 2 from each other. Accordingly, even when the body portion 2 has electrical conductivity, the body portion 2 can be simply electrically insulated from the shell 5 of the base 3. [0036] A light emitting portion 12 is provided to the tip 2B (Fig. 3, Fig. 4) at the opposite side of the body portion 2 to the base 3. The light emitting portion 12 has a base plate 13 as a flat plate portion, and many LEDs 15 as light sources are provided on the upper surface of the base plate 13. The base plate 13 is a member which has a larger diameter than the body portion 2 and is configured in disc-shape in top view. As shown - 19 in Fig. 3 and Fig. 4, the tip 2B of the body portion 2 is connected to the back surface of the base plate 13, so that the body portion 2 is configured as if it extends from the back surface of the base plate 13. [0037] Fig. 5 is a plan view of the base plate 13. As shown in Fig. 5, an insertion opening 14 which is configured to be substantially circular in top view (having substantially the same diameter as the body-portion 2) and through which the electrical circuit board 8 is inserted into the body portion 2 is formed in the plane of the base plate 13 in accordance with a connection portion of the body portion 2. The electrical circuit board 8 is a board on which various kinds of electrical circuits containing the lighting circuit (power supply circuit) for LEDs 15 are mounted, and it is shaped so as to be fitted to the hollow shape of the body portion 2 in front view over the extension length from the terminal 2A of the body portion 2 to the tip 2B thereof. [0038] The diameter R of the body portion 2 (more accurately, the diameter of the insertion opening 14) is set to be substantially equal to the lateral width of the electrical circuit board 8, and a guide groove 50 for guiding insertion of the electrical circuit board 8 while pinching the edge portion of the electrical circuit board 8 is integrally formed on the inner peripheral surface of the body portion 2. As shown in Figs. 3 and 5, a fixing bush 51 is provided to the tip 2B of the body portion 2, and - 20 the electrical circuit board 8 inserted in the body portion 2 is fixed by the fixing bush 51. [0039] The body portion 2 is formed of high thermal-conductivity material, and some of these materials have high electrical conductivity in connection with the characteristic of components contained in the material. Accordingly, when the edge portion of the electrical circuit board 8 is inserted into the guide groove 50 on the inner peripheral surface of the body portion 2, there occurs such a trouble that the electrical circuit components of the electrical circuit board 8 are short-circuited to the body portion 2 or the electrical characteristics thereof vary. Therefore, the mount area Ra (Fig. 3) of the electrical circuit components on the electrical circuit board 8 are limitedly provided to be far away from the edge portion of the electrical circuit board 8 (more accurately, the guide groove 50) by the amount corresponding to the insulation distance, whereby the electrical circuit components of the electrical circuit board 8 are electricallyprotectedfromthebodyportion2. Furthermore, The diameter R of the body portion 2 is reduced to the same level as the lateral width of the electrical circuit board 8, whereby the body portion 2 can be compact in size and light in weight. [0040] LED 15 is formed by integrally packaging an LED element and a resin lens, for example. In this embodiment, white LED is used as LED 15. As shown in Fig. 2(A), LEDs 15 are arranged substantially concentrically on the LED board 16 as a disc-shaped - 21 circuit board so as to be spaced from one another at regular intervals. The number and arrangement of LEDs 15 arranged on the LEDboard16maybe set arbitrarily insofar as required lighting intensity is secured and no unevenness occurs in lighting intensity. [0041] The LED board 16 is screwed and fixed to the base plate 13, and a lead wire lead-out opening 17 is formed substantially at the center of the LED board 16. As shown in Fig. 3, anode and cathode lead wires 29A and 29B for power supply are led out from the electrical circuit board 8 mounted on the body portion 2 through the lead wire lead-out opening 17, and electrically connected to a circuit pattern (not shown) formed on the upper surface of the LED board 16, whereby power is supplied to each LED 15 through the circuit pattern. The electrical connection structure of the electrical circuit board 6 and the LED board 16 is not limited to the connection structurebasedontheleadwires29Aand29B, butmaybea structure that sockets which are fitted to each other and electrically conducted to each other are provided to the upper end of the electrical circuit board 8 and the back surface of the LED board 16 to electrically connect the electrical circuit board 8 and the LED board 16. Furthermore, a structure that the electrical circuit board 8 is directly joined to the back surface of the LED board 16 to be electrically connected to the LED board 16 may be adopted.

- 22 [0042] AsshowninFig. 3andFig. 4, thebaseplate 13 is designed like a tray having a side wall 19 along the peripheral edge thereof, and a cover 22 covering the LED board 16 is screwed to the inner peripheral surface of the side wall 19. The light emitting portion 12 is provided with an annular reflector 21 having a reflection face 21A which is arranged along the circumference of the base plate 13 so as to surround each LED 15 and reflects light beam components Sa (Fig. 3) incident from LEDs 15 to the cover 22 so that the light beam components Sa to be shielded from the respective LEDs 15 to the side wall 19 are extracted fromthe cover22 andallowedtobeusedfor lighting. Byproviding the reflector 21 described above, the light output ratio of the LED lamp 1 is enhanced, and spread of light in the horizontal direction (the direction parallel to the plane of the LED board 16) is suppressed. [0043] A high reflection grade material is used for the reflection face 21A of the reflector 21 so as to obtain high reflectivity so that the light beam component Sa shielded from each LED 15 to the side wall 19 is extracted from the cover 22 and allowed tobe used for lighting. However, aluminumdeposition or the like may be adopted. Furthermore, the cover is added with diffusion agent so that light distribution is not varied even when the reflection face 21A is restricted. However, the cover may be subjected to shot. [0044] The LED lamp 1 is configured as a high output type lamp - 23 by using high output type LEDs 15. Therefore, if no countermeasure is taken, LED temperature would increase due to heat generation of each LED 15, which causes decrease of the lifetime and light quantity of the LEDs 15. Therefore, the heat radiation performance of the LED lamp 1 of this embodiment is enhanced as follows. That is, in this embodiment, the base plate 13 to which the LED board 16 is secured is configured in a disc-like shape whose size is set so that the LED board 16 can be mounted on the base plate 13. Therefore, the contact area between the base plate 13 and the LED board 16 can be increased as compared with the construction that the edge portion of the LED board 16 is supported, for example. Accordingly, the contact area can be set to 50% of the LED board 16 or more, for example, even when the area of the insertion opening 14 is subtracted. Therefore, a sufficient heat transfer amount from the LED board 16 to the base plate 13 can be secured. Furthermore, a heat radiation sheet 20 for the LED board whose size is set to the same area as the LED board 16 or less is sandwiched between the LED board 16 and the base plate 13 as shown in Fig. 3 and Fig. 4, and heat generated from the LEDs 15 is efficiently transferred to the base plate 13 through the LED board 16 and the heat radiation sheet 20 for the LED board, and radiated to the outdoor air from the base plate 13, heat radiation fins 25 and the overall body portion 2. In place of - 24 use of the heat radiation sheet 20 for the LED board, an elastic resin material having heat radiation performance may be integrally coated at a required thickness on the back surface of the LED board 16. The heat radiation sheet 20 for the LED board or the coating on the back surface of the LED board 16 may be brought with insulation performance. [0045] Furthermore, in this embodiment, both the base plate 13 and the body portion 2 are integrally formed of material having high thermal conductivity. Accordingly, the heat resistance between the base plate 13 and the body portion 2 is suppressed, whereby heat transferred to the base plate 13 can be transferred to the body portion 2 with little loss, so that the heat radiation performance can be enhanced. A metal material such as aluminum or the like or thermally conductive resin may be suitably used as the material of the base plate 13 and the body portion 2. Particularly, by forming the base plate 13 and the body portion 2 of thermally conductive resin, the weight of the LED lamp 1 can be reduced more greatly as compared with a case where the base plate 13 and the body portion 2 are formed of a metal material such as aluminum or the like. Incaseofthe sameweight, thenumberof heat radiation fins can be increased, so that the surface area is increased and the heat radiation performance can be more efficiently enhanced. A resin material having excellent thermal conduction performance of 2W/mK or more in thermal conductivity is preferably - 25 used as the thermally conductive resin, and for example polycarbonate resin mixed with carbon fiber having high thermal conductivity (in this embodiment, Raheamer (registered trademark) manufactured by Teijin Limited) is suitably used. The weight of the body portion 2 and the base plate 13 is reduced byusing the thermally conductive resin, so that it is unnecessary to apply a work or a member to reinforce an existing socket or an existing holder for supporting the weight of the LED lamp 1 even when the LED lamp 1 as an alternative to an electrical bulb is mounted on the existing socket or the existing holder, and the LED lamp 1 can be alternatively directly used. [0046] Many planar heat radiation fins 25 extending from the tip 2B to the terminal 2A are radially provided so as to erect from the outer peripheral surface of the body portion 2, and the heat transferred to the body portion 2 is radiated from each heat radiation fin 25. In each heat radiation fin 25, the fin end portion 25A (Fig. 3) thereof is continuously connected to the back surface 13A of the base plate 13, and these heat radiation fins 25, the body portion 2 and the base plate 13 are integrally formed with one another. Accordingly, heat transferred to the body portion 2 is radiated from the heat radiation fins 25 with no loss, and also heat is directly transferred from the base plate 13 to the heat radiation fins 25, whereby the heat radiation performance can be enhanced. [0047] As shown in Fig. 3, the body portion 2 is formed so that - 26 the diameter R thereof is small to the extent that the contained electrical circuit board 8 is accommodated in the body portion 2 (at the same width level as the electrical circuit board 8). Therefore, the contact area between the LED board 16 and the base plate 13 can be secured, and the heat transfer amount between the LED board 16 and the base plate 13 can be made large. In addition, the difference in diameter between the base plate 13 and the body portion 2 increases. Therefore, the length of the fin end portions 25A of the heat radiation fins 25 is set so that the fin end portions 25A extend from the body portion 2 to the edge portion (side wall 19) of the base plate 13, whereby the contact area between each fin end portion 25A and the back surface 13A is also large, and a larger amount of generated heat can be led to the heat radiation fins 25 and radiated therefrom. The heat transfer amount to the heat radiation fins 25 is secured as described above. Therefore, even when the thickness of the heat radiation fins 25 is reduced to, for example, 2.5mm or less, sufficient heat radiation performance can be maintained, and thus the weight can be reduced by the amount corresponding to the reduction of the thickness of the heat radiation fins 25. [0048] However, when the diameter R of the body portion 2 is reduced to the same width level as the electrical circuit board 8, the electrical circuit board 8 is proximate to the body portion 2, and the components mounted on the electrical circuit board 8arethermallyaffectedbyheatofthebodyportion2. Therefore, - 27 according to this embodiment, the components mounted on the electrical circuit board 8 are protected from thermal influence as follows. [0049] That is, as shown in Fig. 3, with respect to the heat radiation fins 25, the fin end portions 25B thereof at the base 3 side are located at the base plate 13 side (at a front side) to be far away from the base 3 by the distance L. Accordingly, no heat radiation fin 25 exists in a section 40 of the distance L from the base 3 along the body portion 2 (hereinafter referred to as "non-fin section"), and thus heat of the heat radiation fins 25 is hardly transferred in the non-fin section 40. Furthermore, the length of the electrical circuit board 8 is set so that the electrical circuit board 8 extends from the terminal 2A of the body portion 2 to the tip 2B thereof. Therefore, under the state that the electrical circuit board 8 is mounted on the body portion 2, the lower end portion 8A of the electrical circuit board 8 is located in the neighborhood of the base 3 and the components mounted on the electrical circuit board 8 are disposed at least at the place corresponding to the non-fin section 40 of the body portion 2 as shown in Fig. 3. As described above, there is no thermal influence caused by the heat radiation fins 25 in the non-fin section 40. Accordingly, electrical circuit components 52 which are liable to be thermally affected (which should be protected from heat) are disposed at the place corresponding to the non-fin section 40 on the circuit - 28 board 8, and electrical circuit components 53 which are hardly thermally affected (which are not required to be protected from heat) are displaced at places other than the non-fin section 40, whereby the electrical circuit components 52 are protected from the heat of the heat radiation fins 25. Accordingly, even when the diameter R of the body portion 2 is reduced to the same width level as the electrical circuit board 8 to enhance the heat radiation performance from the heat radiation fins 25, the electrical circuit components 52 which are liable to be thermally affected out of the components mounted on the electrical circuit board 8 can be protected from heat. Accordingly, the thermal damage of the electrical circuit components 52 can be prevented, and long-term stable lighting can be implemented. [0050] Fig. 6 is a diagram showing a state that the LED lamp 1 is mounted in an existing lamp holder 60 in which each of an existing electrical bulb and the LED lamp 1 can be mounted, wherein Fig. 6 (A) is an overall view, and Fig. 6 (B) is an enlarged view of an X portion shown in Fig. 6(A). With respect to the same members as shown in Figs. 1 to 5, the reference numerals thereof are arbitrarily eliminated from Fig. 6 in order to prevent the illustration from being cumbersome. This lamp holder 60 is a lighting device used for outdoor billboard lighting or the like, and configured to have a cylindrical holder housing 62 and an arm fixing portion 64 which - 29 is provided to the terminal portion 62A of the holder housing 62 and to which a support arm (not shown) is freely rotatably fixed. A socket (not shown) which is screwed to the base 3 of the LED lamp 1 or the existing electrical bulb is disposed at the terminal portion 62A side in the holder housing 62. A power supply line led out from the arm fixing portion 64 is connected to the socket, and power is supplied from the base 3 through the socket to the LED lamp 1 or the electrical bulb. [0051] In the LED lamp 1, the fin end portions 25B of the heat radiation fins 25 are designed like a line which is substantially vertical to the outer peripheral surface of the body portion 2. Accordingly, when the LED lamp 1 is mounted in the lamp holder 60, the fin end portions 25B of the heat radiation fins 25 come into contact with the opening edge portion 66 of the holder housing 62 of the lamp holder 60. With respect to the shape of each heat radiation fin 25 in side view, each heat radiation fin 25 is formed substantially in fan-like fashion as if it draws a moderate arc extending from the back surface 13A of the base plate 13 to the opening edge portion 66 of the holder housing 62. Under the state that the LED lamp 1 is mounted in the lamp holder 60, the sense of unity of these elements is enhanced, and the design performance is enhanced. [0052] The lamp holder 60 is disposed outdoors. Therefore, it is necessary to prevent invasion of water from the opening edge portion 66 into the holder housing 62 in order to protect - 30 the connection portion between the socket and the LED lamp 1. When the mount target is an electrical bulb, by merely providing a waterproof packing to the opening edge portion 66 of the holder housing 62, the glass ball provided to the electric bulb comes into close contact with the waterproof packing, thereby performing waterproof. On the other hand, in the LED lamp 1, the planar heat radiation fins 25 are radially provided on the outer peripheral surface of the body portion 2 so as to erect from the peripheral surface, and thus a gap occurs between the heat radiation fins 25, so that water intrudes into the holder housing 62. Therefore, according to this embodiment, the fin end portions 25B of the heat radiation fins 25 of the LED lamp 1 are provided with an annular waterproof packing 70 for blocking the opening of the lamp holder 60. [0053] The annular waterproof packing 70 is formed to be annular in plan view so that the body portion 2 is inserted through the annular waterproof packing 70 and the respective gaps between the fin end portions 25B of the heat radiation fins 25 are blocked by the annular waterproof packing 70. The annular waterproof packing 70 is interposed between the fin end portion 25B of each heat radiation fin 25 of the LED lamp 1 and the opening edge portion 66 of the lamp holder 60, whereby the opening of the lamp holder 60 is blocked by the annular waterproof packing 70. A seal piece 71 which comes into planar contact with the - 31 outer peripheral surface of the body portion 2 is integrally provided to the inner peripheral side of the annular waterproof packing 70, and the sealing performance between the annular waterproof packing 70 and the body portion 2 is enhanced. Furthermore, weight-reducing concave portions 577 are concentrically formed at plural places on each of the front and back surfaces of the annular waterproof packing 70, whereby the weight of the annular waterproof packing 70 can be reduced. Water leaking concave portions 39 are formed at the fin end portions 25B of the heats radiation fins 25, andwaterstocked in the weight-reducing concave portions 577 located between the heat radiation fins 25 are discharged from the water leaking concave portions 39 as needed. Accordingly, deterioration of the packing and reduction of the waterproof performance due to deposition of dusts caused by long-term use under the state that water is stocked in the water leaking concave portions 39 can be prevented. [0054] As described above, according to this embodiment, the fin end portions 25B of the heat radiation fins 25 are arranged at the terminal 2A of the body portion 2A so as to be far away from the base 3 to the base plate 13 side. Therefore, a portion to which the heat radiation fins 25 do not extend is formed at the terminal 2A side of the body portion 2. Accordingly, most of heat generated from LEDs 15 is transferred to the heat radiation fins 25 provided in the neighborhood of the portion concerned, - 32 and radiated to the outside. Therefore, the portion at the terminal 2A side of the body portion 2 which the radiation heat fins 25 do not reach is little affected by heat generation of LEDs 15. Accordingly, the electrical circuit board 8 is mounted so that the electrical circuit components 52 which are weak to heat are arranged at the inner position of the body portion 2 corresponding to the portion which the heat radiation fins 25 do not reach, whereby the electrical circuit components 52 can be protected from heat transferred to the heat radiation fins 25. [0055] According to this embodiment, the diameter R of the body portion 2 is set to be substantially the same width level as the electrical circuit board 8, whereby the body portion 2 can be designed to be compact in size and light in weight. At this time, according to the above construction, the thermal influence of the heat radiation fins 25 on the electrical circuit board 8 can be suppressed, so that the LED lamp can be made small in size and light in weight with preventing the thermal damage of the electrical circuit components 52. [00561 Furthermore, according to this embodiment, the LED lamp 1 is provided with the annular waterproof packing 70 through which the body portion 2 is inserted and which blocks the fin end portions 25B at the terminal end 2A side between the heat radiation fins 25. Accordingly, when the LED lamp 1 is inserted from the opening of the cylindrical holder housing 62 of the - 33 lamp holder 60, the opening can be blocked by the annular waterproof packing 70 to perform waterproof, and lighting equipment which is suitably used outdoors can be constructed. [0057] Still furthermore, according to this embodiment, the insulating cylinder portion 10 for electrically insulating the body portion 2 and the shell 5 from each other is provided at the opening end side of the shell 5 in the base 3. Therefore, even when the body portion 2 has an electrically conductive property, the electrical insulation between the body portion 2 and the shell 5 can be simply performed. [0058] <Second Embodiment> The first embodiment is configured so that the insulating cylinder portion 10 is provided at the opening end side of the shell 5 of the base 3 to electrically insulate the body portion 2 and the shell 5 from each other. This second embodiment is configured so that the insulating cylinder portion 10 is unnecessary. That is, in this embodiment, as shown in Fig. 7, an upper body portion 37A extending from the base plate 13 to the fin end portions 25B of the heat radiation fins 25 is formed of a resin material having high thermal conductivity, and a lower body portion 37B at the terminal 2A side to which the base 3 is provided is formed of resin having an insulating property, that is, the body portion 102 is formed by so-called two-color molding or insert molding. Accordingly, even when an existing base 3 is mounted on - 34 the terminal 2A of the body portion 102, the insulation between the body portion 102 and the shell 5 can be performed, and the insulation from the electrical circuit board 8 can be simply performed. [0059] <Third Embodiment> In the first embodiment, in order to prevent the thermal influence of the heat radiation fins 25 on the electrical circuit components 52 of the electrical circuit board 8 contained in the body portion 2, the end portion of the terminal 2A side of the heat radiation fins 25 is located to be far away from the base 3 to the base plate 13 side. On the other hand, according to the present invention, the thermal influence on the electrical circuit component 52 is prevented as follows. [0060] Fig. 8 is a cross-sectional view showing the construction of a body portion 202 according to this embodiment. In Fig. 8, the same elements as shown in Fig. 3 and Fig. 7 are represented by the same reference numerals, and the description thereof is omitted. This embodiment is common to the first and second embodiments in that the body portion 202 is configured to have a cylindrical shape which decreases in diameter at the terminal 2A side thereof, and plural heat radiation fins 225 extending from the back surface of the base plate 13 to the terminal 2A side along the outer peripheral surface of the body portion 202 are radially provided on the outer peripheral surface of the - 35 body portion 202. On the other hand, this embodiment is different from the first and second embodiment in that the inner surface portion 287 of the body portion 202 is formed of a resin material which has an electrical insulation property and low thermal conductivity, and the outside portion 286 surrounding the periphery of the inner surface portion 287 is formed of a resin material having high thermal conductivity, that is, the body portion 202 is formed by so-called two-color molding, and also the fin end portions 25B at the terminal 2A side of the heat radiation fins 225 are made to extend to the neighborhood of the fixing position 38 of the base 3. [0061] According to this construction, the heat of the heat radiation fins 225 is prevented from being transferred to the contained electrical circuit board 8 by the inner surface portion 287 having low thermal conductivity, and thus the thermal influence of the electrical circuit board 8 on the electrical circuit components 52 can be prevented. Furthermore, the heat radiation fins 225 can be made to extend to the neighborhood of the fixing position 38 of the base 3 irrespective of the locating position of the electrical circuit components 52 on the electrical circuit board 8, and thus the heat radiation area of the heat radiation fins 25 can be increased, thereby enhancing the heat radiation performance. [0062] Furthermore, in this embodiment, the inner surface - 36 portion 287 of the body portion 202 is provided over the area between the terminal 2A and a position which is far away from the base plate 13 in the direction from the base plate 13 to the terminal 2A side by only a predetermined distance H, and the whole area within the predetermined distance H from the base plate 13 is formed of a highly thermal-conductive material. Accordingly, high heat radiation performance can be maintained without disturbing thermal conduction from the base plate 13 to the heat radiation fins 225. [0063] <Fourth Embodiment> In the first embodiment, in order to prevent the electrical circuit components 52 of the electrical circuit board 8 contained in the body portion 2 from being thermally influenced by the heat radiation fins 25, the end portion at the terminal 2A side of the heat radiation fins 25 are located to be far away from the base 3 to the base plate 13 side. There is a case where no electrical circuit board 8 is contained in a body portion 302 because the base 3 and the LED board 16 are directly connected to each other through lead wires 309A and 309B as in the case of an LED lamp 300 shown in Fig. 9. In this case, the body portion 302 is formed of a material having high thermal conductivity, and the end portions 325B at the terminal 2A side of the heat radiation fins 325 formed on the outer peripheral surface of the body portion 302 are made - 37 to extend to the neighborhood of the base 3 as compared with the first embodiment, whereby the surface area of the heat radiation fin 325 is increased, thereby enhancing the heat radiation performance. However, it is not favorable that the temperature of the base 3 is high, and thus the end portions 325B of the heat radiation fins 325 are spaced from the base 3 by only the minimum interval distance M which prevents the temperature of the base 3 from exceeding a working temperature. [0064] The construction of this embodiment is also applicable to the LED lamp in which all the components mounted on the electrical circuit board 8 are the electrical circuit components 53 which are strong to thermal influence. Furthermore, the construction shown in Fig. 9 may be modified so that each of the heat radiation fins 325 is cut at some position between the base plate 13 and the base 3 as in the case of the first embodiment, and the number of heat radiation fins 325 is increased by the amount corresponding to the reduced surface area of the cut-out portions of the heat radiation fins 325, thereby compensating for the heat radiation amount. According to this construction, the heat generated from the heats radiation fins 325 can be withdrawn at a position near to the LEDs 15 as heat sources and the heat radiation can be efficiently performed without varying the weight of the body portion 302 and the surface area of the heat radiation fins 325. [0065] <Fifth Embodiment> - 38 When an electrically conductive material is used as the material of the body portion 2 to enhance the heat radiation performance of the body portion 2 in the LED lamp 501 described with reference to the first embodiment, there is a problem that the electrical insulation between the body portion 2 and the electrical circuit board 8 is deteriorated. Therefore, the body portion 2 and the electrical circuit board 8 are sufficiently insulated from each other by increasing the gap between the body portion 2 and the electrical circuit board 8. However, in this case, there is a problem that the body portion 2 is large in size and heavy in weight. This problem is common to not only a lamp having LEDs 15, but also a lamp which has other lighting elements as light sources and contains the electrical circuit board 8. [0066] Therefore, in this embodiment, an LED lamp 501 in which the electrical circuit board 8 and the body portion 2 can be sufficiently insulated from each other will be described. In this embodiment, the same elements as described with reference to Figs. 1 to 4 are represented by the same reference numerals, and the description thereof is omitted. [0067] Fig. 10 is a perspective view showing the exterior appearance construction of the LED lamp 501 according to the embodiment, wherein Fig. 10 (A) is an exterior appearance perspective view taken from the upper side, and Fig. 10(B) is an exterior appearance perspective view taken from the lower - 39 side. Fig. 11 is a diagram showing the exterior appearance construction of the LED lamp 501, wherein Fig. 11(A) is a plan view, Fig. 11(B) is a side view, and Fig. 11(C) is a bottom view. Fig. 12 is an exploded perspective view of the LED lamp 501. Fig. 13 is an exploded front view of the LED lamp 501. Fig. 14 is a cross-sectional view showing the internal construction of the LED lamp 501. [0068] In the LED lamp 501 of this embodiment, in order to reduce the weight of the housing 35 comprising the base plate 13, the body portion 2 and the insulating cylinder portion 10, thermally conductive resin is used as the material of the body portion 2, insulating resin is used as the material of the insulating cylinder portion 10 and the body portion 2 and the insulating cylinder portion 10 are formed by the insert molding, whereby these elements are formed by the two-color molding. Accordingly, the body portion 2 and the insulating cylinder portion 10 are firmly joined to each other with reducing the weight of the body portion 2. However, there is a risk that a gap occurs in the joint face (between mating faces) between the body portion 2 and the insulating cylinder portion 10 due to aged deterioration and thus the waterproof performance is lost. Therefore, as shown in Fig. 14 and Fig. 15, a fitting convex portion 2C which projects inwardly in the radial direction of the body portion 2 is formed at the terminal 2A of the body portion 2, an annular fitting - 40 concave portion 10B which is recessed inwardly is formed on the outer peripheral surface in front of the opening end of the insulating cylinder portion 10, and a contact portion 10C which comes into contact with the inner peripheral surface of the body portion 2 and the fitting convex portion 2C is formed at the opening end of the insulating cylinder portion 10. The fitting convex portion 2C is fitted in the fitting concave portion 10B, the contact portion 10C comes into contact with the body portion 2, whereby the joint portion between the body portion 2 and the insulating cylinder portion 10 is constructed in a so-called labyrinth fashion. Furthermore, the area of the joint portion is increased, so that the joint strength is enhanced. The labyrinth-like structure enables the waterproof property to be kept even when a gap occurs in the insert-molding face due to a crack or the like which occurs at the joint portion between the body portion 2 and the insulating cylinder portion 10 due to aged deterioration, and durability which is matched with the lifetime of the LEDs 15 can be obtained. The shape of the joint face between the terminal 2A of the body portion 2 and the opening end (insertion end) of the insulating cylinder portion 10 is not limited to the labyrinth-like shape, and any shape such as a wedge-shape or the like may be adopted insofar as it can provide the waterproof property and enhance the joint strength, for example. [00691 Furthermore, as shown in Fig. 15(A), some of existing - 41 sockets 58 is known as a waterproof socket in which a waterproof socket packing 59 is mounted at the opening end 58A in which the base 3 is inserted. The socket packing 59 is a cylindrical member which covers the joint place between the socket 58 and the LED lamp 501, and a labyrinth-like structure 59B is provided on the inner surface of the lamp insertion opening end 59A side in which the LED lamp 501 is inserted. When the Led lamp 501 is mounted on the socket 58, the lamp insertion opening end 59A of the socket packing 59 comes into close contact with the outer surface at the terminal 2A side of the body portion 2, thereby preventing intrusion of water from the joint place between the socket 58 and the LED lamp 501. Particularly, the terminal 2Aof thebodyportion 2 intrudes into the insulating cylinder portion 10, whereby the externally exposed joint place 57 between the body portion 2 andthe insulating cylinder portion 10 is covered by the socket packing 59. Therefore, even when a crack or the like occurs at the joint place 57, infiltration of water can be prevented by the socket packing 59. [00701 Fig. 15(B) shows a socket packing 5159 according to another embodiment. The socket packing 5159 is lower in height than the socket packing 5159 shown in Fig. 15(A), and the edge portion of the lamp insertion opening end 5159A comes into close contact with the body portion 2 with no gap therebetween to prevent infiltration of water into the socket 58 in place of provision - 42 of the labyrinth structure on the inner surface at the lamp insertion opening end 5159A side. At the terminal 2A side of the body portion 2, the insulating cylinder portion 10 is reduced in diameter in conformity with the diameter of the lamp insertion opening end 5159A of the socket packing 5159 to form a step portion 23, and the lamp insertion opening end 5159A comes into close contact with the body portion 2 with no gap therebetween. The joint place 57 between the body portion 2 and the insulating cylinder portion 10 is provided so as to be brought into contact with and covered by the lamp insertion opening end 5159A of the socket packing 5159, whereby infiltration of water can be prevented even when a crack or the like occurs at the joint place 57. [0071] As shown in Fig. 14, a reinforcing plate portion 30 is provided at an intermediate portion in the axial direction of the insulating cylinder portion 10 so as to partition the inside of the insulating cylinder portion 10 into the body portion 2 and the eyelet 7. The reinforcing plate portion 30 is formed like a plate which is substantially perpendicular to the axial direction of the insulating cylinder portion 10, and wiring holes 31A and 31B penetrating through the reinforcing plate portion 30 are formed in the reinforcing plate portion 30. Introducing cavities 32 which increase in diameter toward the body portion 2 side are formed on the surfaces at the body portion 2 side - 43 of the wiring holes 31A and 31B. Lead wires 9A and 9B are connected to the end at the base 3 side of the electrical circuit board 8, passed through the wiring holes 31A and 31B and then connected to the shell 5 and the eyelet 7, respectively. [0072] When the base 3 is secured to the insulating cylinder 10, the shell 5 is firmly fastened and fixed to the insulating cylinder portion 10 from the outer peripheral side of the reinforcing plate portion 30 while the shell 5 is fitted to the screw portion 33 of the insulating cylinder portion 10. The reinforcing plate portion 30 is provided at this fastening position, and thus provides sufficient strength against the press force in the radial direction of the insulating cylinder portion 10 which is applied under the fastening operation. Therefore, the insulating cylinder portion 10 can be prevented from being deformed by the fastening of the shell 5, and large fastening force can be applied to the shell 5, so that the shell 5 can be surely firmly fastened. As shown in Fig. 12, a lower cavity 56 for fastening of the base 3 is provided on the side surface of the insulating cylinder portion 10, and the shell 5 of the base 3 is firmly fastenedattheplace correspondingtothe lowercavity56, whereby the shell 5 is deformed so as to intrude into the lower cavity 56. Therefore, the deformation amount of the shell 5 increases, and the strength can be enhanced.

- 44 [0073] The lead wire 9A led out from the wiring hole 31A of the reinforcing plate portion 30 bends outwards at the terminal 10A of the insulating cylinder portion 10, extends along the outer side surface of the insulating cylinder portion 10 and then is connected to the shell 5. On the other hand, the lead wire 9B led out from the wiring hole 31B directly extends linearly and then is connected to the eyelet 7. As described above, the wiring holes 31A and 31B through which the lead wires 9A and 9B are led out are provided in front of the position at which the lead wire 9A is bent outwards. Therefore, the lead wires 9A and 9B can be prevented from being entangled with each other and short-circuited to each other due to the entanglement. Furthermore, the wiring holes 31A and 31B are provided with the introducing cavity portions 32 at the introducing side of the lead wires 9A and 9B. Therefore, the lead wires 9A and 9B can be simply passed through the wiring holes 31A and 31B. Particularly, even when the diameter of the wiring holes 31A and 31B are set to substantially the same level as the lead wires 9A and 9B and thus no gap occurs, these lead wires 9A and 9B can be easily passed. [0074] Fig. 16 is an enlarged view of the terminal 10A of the insulating cylinder portion 10. A screw portion 33 with which the inner peripheral surface of the shell 5 engages is formed on the outer peripheral surface of the terminal 10A of the insulating cylinder portion 10.

- 45 Furthermore, a wiring groove 34 extending in the axial direction of the insulating cylinder portion 10 is formed on the outer peripheral surface of the terminal 10A, and the wiring groove 34 is provided as if it is engraved on a part of the screw portion 33. The lead wire 9A which bends and extends outwards from the inside of the insulating cylinder portion 10 is embedded in the wiring groove 34 and extends to the body portion 2 side. That is, under the state that the shell 5 is secured to the insulating cylinder portion 10, the lead wire 9A passes through the wiring groove 34 inside the shell 5, and joined to the outer peripheral surface of the shell 5 in the neighborhood of the opening end of the shell 5. The wiring groove 34 through which the lead wire 9A passes intercommunicates with the inside of the insulating cylinder portion 10, and the inside of the insulating cylinder portion 10 intercommunicates with the eyelet 7 and the body portion 2 through the wiring holes 31A and 31B. Therefore, air is allowed to get into and out of the body portion 2 through the wiring groove 34 and the wiring holes 31A and 31B, thereby preventing dew condensation in the body portion 2. [0075] Fig. 17 is a plan view showing the base plate 13. An insertion opening 14 is formed within the base plate 13 of this embodiment as in the case of the first embodiment. As shown in Fig. 14, the electrical circuit board 8 is formed so as to have such a length as to extend from the tip 2B of the - 46 bodyportion 2 to the reinforcing plate portion 30 of the insulating cylinder portion 10 and have such a shape as to be fitted to the hollow shape of the body portion 2 in front view. As shown in Fig. 14, the diameter R of the body portion 2 is set to substantially the same level as the lateral width of the electrical circuit board 8. As shown in Fig. 17, a fixing groove portion 51A for pinching the corner portion 8B (Fig. 19) of the electrical circuit board 8 into the terminal 2A side of the body portion 2 is provided inside the body portion 2. Furthermore, an abutting piece 51B extending from the tip 2B side of the body portion 2 to the terminal 2A side is provided so as to confront the fixing groove portion 51A. When the electrical circuit board 8 is inserted from the insertion opening 14, the corner portion 8B at the lower end of the electrical circuit board 8 is pinched into the fixing groove portion 51A, and one side of the electrical circuit board 8 which confronts the corner portion 8B abuts against the side surface of the abutting piece 51B, whereby the electrical circuit board 8 is fixed in the body portion 2. As shown in Fig. 12, the upper end portion 8C of the electrical circuit board 8 is pressed through the fixing bush 27 by an LED board 516 described later, whereby the electrical circuit board 8 is firmly fixed. The fixing bush 27 is omitted from the illustration of Fig. 14. An insulating sheet 28 which is rolled so as to surround the electrical circuit board 8 is - 47 provided in the body portion 2, and the body portion 2 and the electrical circuit board 8 are electrically insulated from each other by the insulating sheet 28. Particularly, one side of the lower end of the electrical circuit board 8 which is opposite to the corner portion 8B abuts against and is fixed to the side surface of the abutting piece 51B while the corner portion 8B is pinched by the fixing groove portion 51A, whereby the electrical circuit board 8 is firmly fixed in the body portion 2. Therefore, the insulation distance between the body portion 2 and the electrical circuit board 8 can be surely secured. [0076] As shown in Fig. 11, the LED board 516 is screwed to the base plate 13, and a lead-wire lead-out opening 17 is formed substantiallyat the centerof the LEDboard 516. Node andcathode lead wires (not shown) for supplying power are led out through the lead-wire draw-out opening 17 from the electrical circuit board 8 which is inserted and mounted in the body portion 2, and electrically connected to a circuit pattern 80 formed on the upper surface of the LED board 516, whereby power is supplied to each LED 15 through the circuit pattern. The circuit pattern 80 will be described in detail later. [0077] In this embodiment, as shown in Fig. 11 and Fig. 14, an 0-ring 26 is provided between the cover 22 as a glove for covering the LED board 516 and the base plate 13, and the O-ring 26 is pinched between the cover 22 and the base plate 13 in connection - 48 with screwing of the cover 22 to the side wall 19 of the base plate 13. As described above, the screwing structure is adopted as the fixing structure of the cover 22 to the base plate 13, and the O-ring 26 is pinched between the cover 22 and the base plate 13, whereby the waterproof performance of the light emitting portion 12 is enhanced. [0078] A nameplate (not shown) of the LED lamp 501 is provided on the inner surface of the cover 22 by print, an engraved mark or the like. Accordingly, the nameplate does not disappear even when the LED lamp 501 is exposed to wind and rain and does not wear away due to rubbing. [0079] Here, a resin material mixed with carbon fiber having high thermal conductivity (hereinafter referred to as "thermal conductive fiber") is used as the material of the body portion 2. withrespecttotheresinmaterial, itis knownthatanisotropy occurs in thermal conductivity due to orientation of the thermal conductive fiber. In this embodiment, the heat radiation capability of the body portion 2 is enhanced by orienting the thermal conductive fiber so that the heat conductivity from the body portion 2 and the base plate 13 to the heat radiation fins 25 is high. The orientation of the thermal conductive fiber is controlled on the basis of the flow direction of the resin in a resin molding process. [0080] Furthermore, the heat radiation fins 25 are provided with - 49 a wire hole 89 through which an anti-drop wire is passed as shown in Fig. 10, and the orientation of the thermal conductive fiber may be changed so that the strength of the heat radiation fins 25 is now lowered by the wire hole 89. [0081] Electrical leakage to the housing 35 can be surely prevented by performing surface coating on the body portion 2 and the base plate 13 with insulating paint. However, the surface of the base plate 13 is not painted, and the thermal conduction to the body portion 2 is more excellent when the surface roughness is fine. Therefore, when sufficient insulation is secured, the insulation based on painting of the surface of the base plate 13 is not necessarily required. [0082] When the diameter R of the body portion 2 is reduced to the same level as the width of the electrical circuit board 8, the electrical circuit board 8 is proximate to the body portion 2, and the electrical insulation performance between the body portion 2 and the electrical circuit board 8 is deteriorated. Therefore, the insulating sheet 28 which is rolled so as to surround the electrical circuit board 8 is provided in the body portion 2, whereby the whole inner side surface of the body portion 2 is covered by the insulating sheet 28 to enhance the insulation performance between the electrical board 8 and the body portion 2. [0083] Fig. 18 is a diagram showing the construction of the insulating sheet 28, wherein Fig. 18(A) is a plan view, Fig.

- 50 18 (B) is a plan view under the state that the insulating sheet 28 is mounted in the body portion 2 and Fig. 18(C) is a side view when the insulating sheet 28 is mounted to the body portion 2. As shown in Fig. 18, the insulating sheet 28 is formed by designing one sheet having flexibility and insulation properties in band-like shape. When it is mounted in the body portion 2, a recess portion 28C which is fitted to the abutting piece 51B on the inner side surface of the body portion 2 is formedby replication, andthen the insulating sheet 28 is inserted from the insertion opening 14 of the base plate 13 while it is annularly rolled so that both the ends 28A and 28B are overlapped with each other. The insulating sheet 28 unrolls and expands in the body portion 2, and at this time the insulating sheet 28 is mounted so as to cover the inner side surface of the body portion 2 by the unrolling force. As described above, the insulating sheet 28 is formed in band-like shape, inserted into the insertion opening 14 of the base plate 13 with being rolled, and loaded into the body portion 2 by the unrolling of the insulating sheet 28. Therefore, the insulating sheet 28 can be easily loaded so as to cover the whole surface of the inner side surface of the body portion 2. [0084] As described above, the power supply circuit for converting power supplied from the socket 58 to power for turning - 51 on the LEDs 15 is mounted on the electrical circuit board 8, and heat generated from the power supply circuit increases the internal temperature of the body portion 2, so that other electrical circuits are thermally affected. Therefore, in this embodiment, the heat generated from the power supply circuit and other heat generating components is conducted to the body portion 2, and radiated from the heat radiation fins 25, whereby the internal temperature of the body portion 2 can be kept to proper temperature. This construction will be described hereunder. [0085] Fig. 19 is a diagram showing the fitting relationship of the electrical circuit board 8, the fixing bush 27 and the LED board 516. Fig. 20 is a diagram showing the construction of the fixingbush27, whereinFig. 20(A) isanoverallperspective view, Fig. 20(B) is a front view, Fig. 20(C) is a side view, Fig. 20(D) is a plan view and Fig. 20(E) is a bottom view. As described above, when the electrical circuit board 8 is assembled to the body portion 2, the upper end portion 8C thereof is pressed through the fixing bush 27 by the LED board 516. This fixing bush 27 is formed of resin material such as rubber or the like. It is more preferable that the resinmaterial has high thermal conductivity. Furthermore, cooling pieces 27A are formed integrally with the fixing bush 27 so as to cover cooling-required circuit components out of the circuit components of the electrical circuit board 8 in close contact with the - 52 cooling-required circuit components. In this embodiment, the power supply circuit mounted on the electrical circuit board 8 and the heat generating components 82 which are juxtaposed with and at the same height as the power supply circuit are cooled, and the cooling pieces 27Awhich cover these elements are provided integrally with the fixing bush 27. Each cooling piece 27A is configured to have the shape corresponding to the shape of the circuit component as a cooling target. Furthermore, in this embodiment, a cooling piece holding member 81 which is formed of metal and configured to have a U-shaped cross-section is brought into close contact with and secured to a heating component 82A which is more strongly required to be cooled out of the heating components 82, and a part of the cooing piece 27A having a rectangular cylindrical shape is inserted and fit into a recess portion of the cooling piece holding member 81. Accordingly, heat generated from the heat generating component 82A is efficiently transferred through the metal cooling piece holding member 81 to the whole side surfaces (that is, the outer peripheral surface 36) of the cooling pieces 27A. [0086] The outer peripheral surface 36 of the cooling pieces 27A comes into close contact with the inner side surface in connection with insertion of the electrical circuit board 8 into thebodyportion2. At this time, the press force which is applied from the inner side surface of the body portion 2 to the cooling pieces 27A is received by the abutting piece 51B which supports - 53 one side of the electrical circuit board 8, whereby the cooling pieces 27A are held between the electrical circuit board 8 and the inner side surface of the body portion 2 with being crushed. Accordingly, the cooling piece 27A is brought into close contact with the power supply circuit, the heating components 82, 82A and the inner side surface of the body portion 2, whereby the heat resistance of the heat transfer path can be reduced and backlash of the electrical circuit board 8 in the body portion 2 can be suppressed, thereby surely supporting the electrical circuit board 8. [0087] As described above, the inner side surface of the body portion 2 is coveredby the insulating sheet 28. Amaterialhaving high thermal conductivity is used for the insulating sheet 28, so that heat transfer from the outer peripheral surface 36 of the cooling pieces 27A of the fixing bush 27 to the body portion 2 is not disturbed by the insulating sheet 28. As described above, the insulating sheet 28 has high thermal conductivity, and the fixing bush 27 serving as the thermal conductive member for thermally connecting the circuit component of the electrical circuit board 8 and the insulating sheet 28 is provided between the circuit component of the electrical circuit board 8 andthe insulating sheet 28, whereby the electrical circuit board 8 can be surely fixed in the body portion 2, and both the insulating performance and the heat radiation performance of the electrical circuit board 8 can be enhanced.

- 54 Furthermore, the cooling pieces 27A are formed integrally with the fixing bush 27, so that the electrical circuit board 8 can be simply fixed and cooled. [0088] The circuit components such as the power supply circuit, the heat generating components 82, 82A, etc. which are required to be cooled are arranged in a height range X (Fig. 19) in which the heat radiation fins 25 are located. That is, the cooling pieces 27a covering the power supply circuit and the heat generating components 82, 82A are arranged in the height range X in which the heat radiation fins 25 are located. Therefore, heat transferred to the cooling pieces 27A is smoothly radiated from the heat radiation fins 25, and the cooling performance can be enhanced. In addition, the heat generated from the power supply circuit, the heat generating components 82, 82A, etc. are directly transferred to the heat radiation fins 25, so that the thermal influence on the circuit components arranged in the non-fin section 40 is suppressed. [0089] Next, the heat radiation structure of the LEDs 15 will be described. In the heat radiation structure of the LEDs 15, the LED bard 516 is formed of a metal material having high thermal conductivity such as aluminum material or the like, for example, whereby the heat generated from the LEDs 15 can be efficiently transferred to the base plate 13 and radiated from the heat - 55 radiation fins 25. However, there is a problem that the electrical insulation performance is deteriorated when the LED board 516 comprises a metal board. Therefore, in this embodiment, a resin board having high electrical insulation properties is used as the LED board 516, and the thickness thereof is set to such a value that the same insulation performance as a so-called dual insulation structure can be obtained, thereby implementing high insulation performance. [0090] The LED board 516 formed of a resin material disturbs increase of light output power without taking any countermeasure because it has lower heat radiation performance than the metal board. Therefore, in this embodiment, each of the front and back surfaces of the LED board 516 is coated with copper foil as a heat radiation layer to thereby enhance the heat radiation performance of the LED board 516. This structure will be described hereunder in detail. [0091] Fig. 21 is a diagram showing the construction of the LED board 516, wherein Fig. 21(A) is a plan view taken when the LED mount surface side is viewed, Fig. 21 (B) is a side view and Fig. 21 (C) is a bottom view taken when the back surface side is viewed. The LED board 516 is formed substantially in disc-shape, and copper foil 83 having a substantially circular shape as a heat radiation layer having electrical conductivity and thermal - 56 conductivity is coated on each of the front and back surfaces of the LED board 516. The surface of the copper foil 83 on the back surface is protected by using resist. Each copper foil 83 is formed so as to have such a size that it covers the whole surface of the LED board 516 as much as possible except for a gap throughwhich each copper foil 83 canbe electrically insulated from the side wall 19 of the base plate 13 surrounding the LED board 516 and notches 83A for keeping insulation from screws used when the LED board 516 is screwed. [0092] The plural LEDs 15 are concentrically mounted on one surface of the LED board 516 (hereinafter referred to as LED mount surface), and the circuit pattern 80 of each LED 15 is formed by using the copper foil 83. That is, as shown in Fig. 21(A), plural slits 84 are radially formed in the copper foil 83, and the copper foil 83 is divided (sectioned) into plural electrically conductive and substantially sectorial areas 85 by the respective slits 84. The width of each slit 84 is so sufficient that the electrical insulation can be obtained between the electrical conductive areas 85, and each LED 15 is provided so as to stride over the slit 84 so that a positive electrode terminal and a negative electrode terminal (not shown) provided to the back surface of LED 15 are connected to the adjacent electrically conductive areas 85 respectively. At least two adjacent electrically conductive areas 85 out of these electrically conductive areas - 57 85 are electrically connected to the power supply circuit of each electrical circuit board 8, whereby the respective LEDs 15 are connected to one another in series by the respective electrically conductive areas 85 to form a series circuit. [0093] As described above, the copper foil 83 covering the LED mount surface is sectioned into the planar electrical conductive areas 85 electrically-connected to the power supply circuit by the slits 84, and the LEDs 15 are electrically connected to the respective electrically-conductive areas 85 so as to stride over these slits 84 to construct the circuit pattern 80 for lighting the LEDs 15. Therefore, the LED mount surface can be brought with high heat radiation performance. Particularly, the slits 84 are radially provided in the copper foil 83, and thus each electrically-conductive area 85 is formed in a substantially sectorial, so that the heat resistance is reduced more greatly toward the outside in the radial direction in each electrically-conductive area 85. Therefore, the heat generated from the LEDs 15 can be efficiently transferred and diffused to the outside. [0094] As shown in Fig. 21 (C) , an exposure portion 16A through which the LED board 516 of insulating resin is exposed is provided at the place corresponding to the insertion opening 14 of the body portion 2 in the copper foil 83 at the back surface side of the LED board 516. Accordingly, the place confronting the electrical circuit - 58 board 8 inserted in the insertion opening 14 serves as the exposure portion 16A, so that the electrical insulation from the electrical circuit board 8 is not lost. [0095] Furthermore, since the copper foil 83 is provided with the exposure portion 16A, the heat radiation performance is deteriorated by the amount corresponding to the exposure portion 16A, but the fixing bush 27 which is pressed by the LED board 516 to press the electrical circuit board 8 against the bottom portion of the body portion 2 is brought into close contact with the exposure portion 16A. As described above, the fixing bush 27 is formed integrally with the cooling pieces 27A which come into close contact with the body portion 2, so that heat of the exposure portion 16A is transferred through the cooling pieces 27A of the fixing bush 27 (more accurately, the outer peripheral surface 36 on which the cooing pieces 27A come into contact with the body portion 2) to the body portion 2, and thus the temperature of the exposure 16A can be prevented from excessively increasing. [0096] The copper foil 83 is exemplified as the heat radiation layer. However, the present invention is not limited to the copper foil, and any material may be used insofar as it is formed of an electrically conductive material having thermal conductivity and functioning as an electrical wire. However, it is unnecessary that the heat radiation layers of the front and back surfaces of the LED board 516 are formed of the same material.

- 59 [0097] Furthermore, the circuit pattern 80 is not limited to the series circuit of LEDs 15, but any circuit such as a parallel circuit or the like may be applied as the circuit pattern 80. For example, as shown in Fig. 22, a slit A is concentrically provided in a substantially circular copper foil 83 to compart the copper foil 83 into an inner peripheral side 831 and an outer peripheral side 830, and slits 84A are radially formed in each of the inner peripheral side 831 and the outer peripheral side 830 to form the series circuit of the LEDs 15 described above, whereby the two series circuits are provided in parallel on the inner peripheral side 831 and the outer peripheral side 830. [0098] With respect to the LED lamp 501, the fin end portions 25B of the heat radiation fins 25 are shaped to be linear substantially vertically to the axis line of the body portion 2, and also the respective fin end portions 25B are located substantially at the same height in the axis direction of the body portion 2 as shown in Fig. 11, for example. Accordingly, when the LED lamp 501 is mounted in a lamp holder 60 as shown in Fig. 23, each fin end portion 25B abuts against the opening edge portion 66 of the holder housing 62 of the lamp holder 60. Furthermore, each of the heat radiation fins 25 is configured to have a substantially sectorial shape in side view as if it draws a moderate arc extending from the back surface 13A of the base plate 13 to the opening edge portion 66 of the holder housing 62, and the sense of unity of these elements is enhanced and - 60 the design performance is also enhanced under the state that the LED lamp 501 is mounted in the lamp holder 60. [0099] An LED lamp device 5100 shown in Fig. 23 is lighting equipment used to light a billboard disposed outdoors or the like and configured to have an LED lamp 501, a lamp holder 60, and an annular waterproof packing 570 interposed between the LED lamp 501 and the lamp holder 60 as in the case of the device described with reference to Fig. 6 in the first embodiment. Plural projections 68 for fixing a net-like guard member (not shown) which covers and protects the LED lamp 501 are provided on the outer peripheral surface below the opening edge portion 66 of the lamp holder 60. A socket 58 to which the base 3 provided to the terminal of the Led lamp 501 or the base 92 of an existing electrical bulb 90 (Fig. 25) is fitted is disposed at the terminal portion 62a side in the holder housing 62. A power supply line which is led in from an arm fixing portion 64 is connected to the socket 58, and power is supplied from the base 3 through the socket 58 to the LED lamp 501 or the existing electrical bulb lamp 90. [0100] Fig. 25 is a cross-sectional view showing a state that the existing electrical bulb lamp 90 is mounted in the lamp holder 60. The electrical bulb lamp 90 has an electrical bulb portion 91 formed of glass and a cylinder portion 93 having a base 92 at the terminal thereof. The electrical bulb lamp 90 is mounted - 61 in the lamp holder 60 by fitting the base 92 into the socket 58. Under this state, an annular packing 94 for the electrical bulb is interposed between a base portion 90A of the electrical bulb lamp 90 in the neighborhood of the cylinder portion 93 and the opening edge portion 66 of the holder housing 62. Asdescribed above, the electrical bulb lamp 90 has such a size that the base portion 90A comes into contact with the opening edge portion 66, and the annular packing 94 for the electrical bulb is interposed along the opening edge portion 66 to block the opening of the lamp holder 60, whereby the gap between the electrical bulb lamp 90 and the lamp holder 60 can be waterproofed. [0101] The lamp holder 60 is disposed outdoors. Therefore, it is necessary to waterproof the lamp holder 60 so that water is prevented from invading from the opening edge portion 66 into the holder housing 62 in order to protect the connection portion between the socket 58 and the LED lamp 501. As shown in Fig. 25, when the electrical bulb lamp 90 is a mount target, the electrical bulb packing 94 is interposed between the electrical bulb lamp 90 and the opening edge portion 66, whereby waterproof can be performed. On the other hand, when the LED lamp 501 is a mount target, the planar heat radiation fins 25 are radially provided on the outer peripheral surface of the body portion 2 so as to erect from the outer peripheral surface, and thus a gap occurs between the heat radiation fins 25. Therefore, water intrudes into the - 62 holder housing 62 by merely providing the electrical bulb packing 94 along the opening edge portion 66. Therefore, in this embodiment, as shown in Fig. 23, an annular waterproof packing 570 for blocking the opening of the lamp holder 60 is provided at the fin end portion 25B side of the heat radiation fins 25 of the LED lamp 501. [0102] As shown in Fig. 24, the outer peripheral surface of the body portion 2 is designed in a conical shape so as to be tapered from the tip 2B to the terminal 2A toward the base 3 side. The intermediate portion between the heat radiation fin 25 and the base 3 on the outer peripheral surface has a tapered conical portion 41 (intermediate portion) which is tapered toward the base 3 side, and the annular waterproof packing 570 is secured to the conical portion 41 while the conical portion 41 is fitted in the annular waterproof packing 570. [0103] Fig. 26 is a diagram showing the annular waterproof packing 570, wherein Fig. 26(A) is a plan view, and Fig. 26(B) is a IX-IX cross-sectional view of Fig. 26(A). Fig. 27 is an enlarged view of the neighborhood of the annular waterproof packing 570 in Fig. 26. The annular waterproof packing 570 is configured in disc-like shape whose size is set so as to cover the whole of the opening edge portion 66 of the holder housing 62, and it has a packing main body 571 interposed between the fin end portion 25B and the opening edge portion 66 of the holder housing 62, - 63 anda conical hole 572 (innerperipheral portion) whichisprovided at the center of the annular waterproof packing 570 and through which the body portion 2 is inserted. The annular waterproof packing 570 is formed of rubber, and in this case silicon rubber is used. In the packing main body 571, the outer peripheral portion 578 thereof is provided with a flange portion 571A which comes into contact with the end face of the opening edge portion 66, and an outer peripheral surface 571B which is continuous with the flange portion 571A and comes into contact with the inner peripheral surface of the opening edge portion 66. The packing main body 571 has a top surface 571C facing the fin end portions 25B. [0104] An annular groove portion 573 is formed on the top surface 571c so as to lap the packing main body 57 inside the outer edge of the packing main body 571. A water drain 574 (drain portion) is formed on the top surface 571C so as to extend to the outside in the radial direction and make the annular groove portion 573 intercommunicate with the outer peripheral surface of the packing main body 571. A plurality of water drains 574 are provided so astobe spaced from one another at substantially regular intervals in the peripheral direction of the packing main body 571. Furthermore, a weight-reducing recess portion 577 is formed on the surface at the opposite side to the top surface 571C of the packingmainbody 571, whereby the weight of the annularwaterproof - 64 packing 570 is reduced. A plurality of annular outer-peripheral side lip portions 575 projecting in the radial direction are provided on the outer peripheral surface 571B to thereby enhance sealing performance. [0105] The inner peripheral surface of the conical hole 572 is designed in conical shape so as to be tapered to the socket 58 side under the state that it is assembled to the holder housing 562. Anannularlipportion576projectinginwardlyintheradial direction is formed on the inner peripheral surface of the conical hole 572, and a plurality of lip portions 576 are formed in the axial direction of the conical hole 572, whereby the surface of the inner peripheral surface of the conical hole 572 is designed to be meandered. The conical hole 572 and the conical portion 41 of the body portion 2 are set to the substantially equal taper angle. Here, in Fig. 27, the outer-peripheral side lip portions 575 and the lip portions 576 come into contact with their contact partner surfaces with being deformed, and thus the shapes thereof before the deformation are represented by two-dotted chain lines. [0106] When the LED lamp 501 is secured to the lamp holder 60, the annular waterproof packing 570 is first fitted to the conical portion 41 of the body portion 2 through the conical hole 572. Thereafter, the LED lamp 501 is inserted into the lamp holder 60, the waterproof packing 570 is fit into the opening edge portion 66 of the holder housing 62, the base 3 is set in the socket 58, and the LED lamp 501 is rotated and fastened, whereby the - 65 base 3 is screwed into the socket 58. As described above, the conical portion 41 taped to the terminal 2A of the body portion 2 and the conical hole 572 of the annular waterproof packing 570 are fitted to each other. Therefore, the annular waterproof packing 570 can be pressed against the opening edge portion 66 side of the lamp holder 60 by the tapered slant surface of the conical portion 41, and the annular waterproof packing 570 can be prevented from dropping off the lamp holder 60, so that the waterproof performance between the LED lamp 501 and the lamp holder 60 can be enhanced. Furthermore, by fitting the conical portion 41 into the conical hole 572 of the annular waterproof packing 570, the LED lamp 501 can be positioned in the radial direction of the lamp holder 60, and the LED lamp 501 can be positioned with a simple construction using no dedicated positioning member. [0107] Under the state that the base 3 is completely screwed into the socket 58, the LED lamp 501 intrudes into the conical hole 572 containing the lip portion 576 by a depth at which the conical hole 572 is slightly deformed to the outside in the radial direction. Under this state, the outer peripheral surface 571B of thepackingmainbody 571 is pressed against the innerperipheral surface of the holder housing 62, and the flange portion 571A is pressed against the opening edge portion 66. As described above, the conical portion 41 is fitted into the conical hole 572 by the depth at which the conical hole 572 is slightly deformed - 66 to the outside in the radial direction. Therefore, the sealing performance between the conical portion 41 and the conical hole 572 can be enhanced, and the waterproof performance between the body portion 2 and the packing main body 571 can be enhanced. The flange portion 571A of the packing main body 571 is pressed against the opening edge portion 66 by the conical portion 41, and the outer peripheral surface 571B containing the outer-peripheral side lip portion 575 is pressed against the inner peripheral surface of the holder housing 62, so that the sealing performance between the packing main body 571 and the holder housing 62 can be enhanced, and the waterproof performance between the annular waterproof packing 570 and the lamp holder 60 can be enhanced. Furthermore, the LED lamp 501 is set so that the packing main body 571 is pressed between each fin end portion 25B and the opening edge portion 66 by the fastening force between the base 3 and the socket 58 under the state that the base 3 is completely screwed into the socket 58. Therefore, the packing main body 571 can be kept in close contact so as to be crushed between each heat radiation fin 25 and the opening edge portion 66, and the waterproof performance between the annular waterproof packing 570 and the lamp holder 60 can be enhanced. [0108] Liquid invading into the gap between the respective heats radiation fins 25 is prevented from invading into the lamp holder 60 by the annular waterproof packing 570, flows into the annular - 67 groove portion 573 formed on the top surface 571C of the annular waterproof packing 570, passes through the water drains 574 and discharges to the outside. Asdescribedabove, the liquid flowing into the annular groove portion 573 on the top surface of the annular waterproof packing 570 is discharged from the plural water drains 574 to the outside. Therefore, liquid and dust can be prevented from being pooled at the annular waterproof packing 570, and the waterproof performance of the annular waterproof packing 570 can be kept excellent for a long term. [0109] The outer peripheral surface 571B of the annular waterproof packing 570 is pressed against the opening edge portion 66 of the lamp holder 60 and crushed as described above. However, the present invention is not limited to this style. The fin end portions 25B may be deflected upwards so that the fin end portions 25B do not come into contact with the annular waterproof packing 570, and the annular waterproof packing 570 maybe pressed against the opening edge portion 66 through the conical hole 572 by only the conical portion 41 to fix the annular waterproof packing 570. [0110] According to the embodiment described above, the following effect can be obtained. That is, according to the LED lamp 501 of this embodiment, the inner side surface of the body portion 2 is covered by the insulating sheet 28. Therefore, the electrical circuit board 8 and the bodyportion2 canbe sufficiently electrically insulated - 68 from each other, and the body portion 2 can be made close to the electrical circuit board 8 to the extent that the body portion 2 and the electrical circuit board 8 are insulated from each other. Accordingly, the LED lam 501 can be miniaturized and reduced in weight. The double insulation between the body portion 2 and the electrical circuit board 8 can be performed by the insulating sheet 28 and the distance between the body portion 2 and the electrical circuit board 8. [0111] Furthermore, according to the LED lamp 501 of this embodiment, the insulating sheet 28 having flexibility is designed in band-like shape, inserted from the insertion opening 14 into the body portion 2 while rolled, and mounted on the inner side surface of the body portion 2 by the unrolling of the insulating sheet 28. Accordingly, the insulating sheet 28 can be easily mounted so as to cover the whole surface of the inner side surface of the body portion 2. [0112] According to the LED lamp 501 of this embodiment, the insulating sheet 28 is formed of a sheet having high thermal conductivity, the cooling piece 27A as a thermally conductive material is provided between the insulating sheet 28 and the electrical circuit board 8, and the heat of the electrical circuit board 8 is transferred through the insulating sheet 28 to the body portion 2. Therefore, the insulating and heat radiating performance of the electrical circuit board 8 can be enhanced - 69 with a simple construction. [0113] According to the LED lamp 501 of this embodiment, the power supply circuit and the heat generating components 82, 82A which are circuit components as cooling targets and the cooling pieces 27A are arranged in the range X of the body portion 2 in which the heat radiation fins 25 extend. Therefore, the heat transferred to the cooling pieces 27A can be smoothly radiated from the heat radiation fins 25 and thus the cooling performance can be enhanced. In addition, the heat generated in the power supply circuit, the heat generating components 82, 82A, etc. is directly transferred to the heat radiation fins 25, so that the thermal influence on the circuit components arranged in the non-fin section 40 can be suppressed. [0114] Furthermore, according to the LED lamp 501 of this embodiment, one side of the electrical circuit board 8 which confronts the corner portion 8B at the lower end of the electrical circuit board 8 abuts against the side surface of the abutting piece 51B while the corner portion 8B is pinched by the fixing groove portion 51A, whereby the electrical circuit board 8 can be firmly fixed in the body portion 2. Therefore, the insulation distance between the body portion 2 and the electrical circuit board 8 can be surely secured. [0115] Still furthermore, according to the LED lamp 501 of this embodiment, the LED board 516 is formed of a resin board whose size is set so as to obtain so-called double insulation, and - 70 the copper foil 83 as the heat radiation layer formed of a material having electrical conductivity and thermal conductivity is provided on each of the mount surface of the LED board 516 on which the LEDs 15 are mounted and the back surface of the LED board 516 which transfers heat to the housing 35. On the mount surface of LEDs 15, a power source is connected to the copper foil 83, the slits 84 are formed in the copper foil 83 to divide the copper foil 83 into the electrically conductive areas, and LEDs 15 are arranged so as to straddle over the slits 84, whereby the LEDs 15 are electrically connected to the respective electrically conductive areas 85. According to this construction, the heat radiation performance of the LED board 516 can be enhanced while the LED board 516 is brought with the high insulation performance. [0116] According to the LED lamp 501 of this embodiment, the slits 84 are radially formed in the copper foil 83 at the mount surface side of the LED board 516, and LEDs 15 are provided to the respective slits 84. According to this construction, each electrically conductive area 85 is formed to have a substantially sectorial shape, and the heat resistance is reduced toward the outside in the radial direction in each electrically conductive area 85. Therefore, the heat generated from LEDs 15 can be efficiently transferred and diffused to the outside. [0117] According to the LED lamp 501 of this embodiment, the - 71 exposure portion 16A through which the LED board 516 is exposed is provided at the place which is a part of the copper foil 83 provided on the back surface of the LED board 516 and corresponds to the insertion opening 14 through which the electrical circuit board 8 is inserted. Therefore, the electrical insulation between the electrical circuit board 8 and the LED board 516 is not damaged by the copper foil 83 on the back surface. [0118] Furthermore, according to the LED lamp 501 of this embodiment, the fixing bush 27 which is pressed against to the exposure portion 16A of the LED board 516 to press the electrical circuit board 8 and transfers the heat of the LED board 516 to the body portion 2 is provided between the electrical circuit board 8 and the back surface of the LED board 516. According to this construction, the heat of the exposure portion 16A is transferred to the body portion 2 through the cooling pieces 27A of the fixing bush 27 (more accurately, the outer peripheral surface 36 on which the cooling pieces 27A come into contact with the body portion 2), and the temperature of the exposure portion 16A can be prevented from excessively increasing. [0119] Still furthermore, according to the LED lamp device 5100 of the embodiment, the intermediate portion of the body portion 2 between the base 3 and the heat radiation fin(s) 25 provided at the joint portion of the body portion 2 to the light emitting portion 12 of the body portion 2 has the tapered conical portion - 72 41 tapered to the terminal 2A of the body portion 2, has the conical hole 572 through which the inner peripheral portion of the annular waterproof packing 570 can be fitted to the conical portion 41 of the body portion 2, the conical hole 572 is fitted to the conical portion 41 when the annular waterproof packing 570 is mounted, the outer peripheral surface 71B of the annular waterproof packing 570 is engaged with the opening edge 66 of the lamp holder 60 to form the waterproof structure, and the conical portion 41 tapered to the terminal 2A and the conical hole 572 is fitted to each other. Therefore, the annular waterproof packing 570 is pressed against the opening edge portion 66 side of the lamp holder 60 by the conical portion 41, whereby the annular waterproof packing 570 can be prevented from dropping off the lamp holder 60. Therefore, liquid flowing from the heat radiation fin 25 side to the annular waterproof packing 570 side can be prevented from intruding into the gap between the annular waterproof packing 570 and the opening edge portion 66 of the lamp holder 60 and the body portion 2, whereby the waterproof performance between the LED lamp 501 and the lamp holder 60 can be enhanced. [0120] The outer peripheral surface 571B of he annular waterproof packing 570 is pressed against the opening edge portion 66 of the lamp holder 60 and crushed by the fin end portions 25B, so that the waterproof performance between the annular waterproof packing 570 and the lamp holder 60 can be enhanced.

- 73 Furthermore, the annular lip portion 576 projecting inwardly in the radial direction is formed in the conical hole 572 of the annular waterproof packing 570, so that the sealing performance and the waterproof performance between the conical hole 572 and the conical portion 41 can be enhanced. Still furthermore, liquidflowingtotheannularwaterproof packing 570 can be discharged to the outer peripheral surface side of the annular waterproof packing 570 through the annular groove portion 573 and the water drains 574, and the waterproof performance of the annular waterproof packing 570 can be kept excellent. [01211 With respect to the fifth embodiment described above, it is described that the outer peripheral surface 571B of the annular waterproof packing 570 is crushed by pressing the outer peripheral surface 571B against to the opening edge portion 66 of the lamp holder 60 by the fin end portions 25B. However, the present invention is not limited to this style. The annular waterproof packing 570 may be fixed by deflecting the fin end portions 25B upwardly so that the fin end portions 25B do not come into contact with the annular waterproof packing 570 and pressing the annular waterproof packing 570 to the opening edge portion 66 through the conical hole 572 by only the conical portion 41. Furthermore, with respect to the fifth embodiment, it is described that the heat radiation fins 25 are provided on the - 74 outer peripheral surface of the body portion 2 so as to be radially arranged around the axial line of the body portion 2. However, the heat radiation fins may be provided as shown in Fig. 28. In the example shown in Fig. 28, heat radiation fins 525 are configured in a plate-like shape having a face parallel to the plane extending in parallel to the axial line of the body portion 2, and arranged in parallel to one another so as to be spaced from one another at regular intervals and erected from the back surface 13A of the base plate 13 to the terminal 2A side. The annular waterproof packing 570 is swaddled to the opening edge portion 66 side of the lamp holder 60 by the conical portion 41, and the annular waterproof packing 570 is pressed against the opening edge portion 66, whereby the waterproof performance between the LED lamp 501 and the lamp holder 60 can be enhanced. [0122] <Sixth Embodiment> In a sixth embodiment, it is described that the conical portion 41 of the body portion 2 is fitted to the conical hole 572 of the annular waterproof packing 570, whereby the waterproof performance between the body portion 2 and the annular waterproof packing 570 is enhanced. However, in this embodiment, a construction of pressing the upper surface of the waterproof packing to perform waterproof will be described. In this embodiment, the same members as the fifth embodiment are represented by the same reference numerals, and the description thereof is omitted.

- 75 [0123] Fig. 29 is a cross-sectional view showing the internal construction of an LED lamp device 6200 according to this embodiment. As shown in Fig. 29, the LED lamp device 6200 (lamp device) is configured to have an LED lamp 601 (lamp), a lamp holder 60, and an annular waterproof packing 670 interposed between the LED lamp 601 and the lamp holder 60. The LED lamp 601 has a body portion 602 extending from the base plate 13 to the base 3, and a step portion 640 projecting to the outside in the radial direction of the body portion 602 is provided to the body portion 602 between the heat radiation fins 25 and the base plate 3, that is, below the fin end portions 25B. The step portion 640 is a step portion extending to the outside so as to be substantially orthogonal to the axial line of the body portion 602, and is provided so as to make a circuit of the outer periphery of the body portion 602. [0124] A cylinder portion 641 (intermediate portion) of a substantially perfect circle is formed at the intermediate portion of the body portion 602 so as to be continuous with the lower surface of the step portion 640 and extends to the base 3 side substantially in parallel to the axial line of the body portion 602. The annular waterproof packing 670 is fitted to the cylinder portion 641, whereby the annular waterproof packing 670 is secured to the LED lamp 601. A fitting hole 672 (inner peripheral portion) which is - 76 fitted to the cylinder portion 641 is formed in the annular waterproof packing 670. The fitting hole 672 is formed at the center in the radial direction of the annular waterproof packing 670, and is formed as a substantiallyperfect circle which extends substantially orthogonally to the upper surface 571C. [0125] Under the state that the LED lamp 601 is secured to the lamp holder 60, the annular waterproof packing 670 is pressed against the opening edge portion 66 side by the step portion 640. Therefore, the annular waterproof packing 670 can be prevented fromdropping off, and also the waterproof performance between the flange portion 571A and the opening edge portion 66 can be enhanced. Furthermore, the lower surface of the step portion 640 comes into close contact with the upper surface 571C of the peripheral edge portion of the fitting hole 672, so that the waterproof performance between the fitting hole 672 and the body portion 602 can be enhanced. Furthermore, the fitting hole 672 is fitted to the cylinder portion 641, so that the LED lamp 601 can be easily positioned in the radial direction of the lamp holder 60. [0126] As described above, according to this embodiment, the body portion 602 is provided with the step portion 640 between the base 3 and the heat radiation fins 25 provided at the joint portion of the body portion 602 to the light emitting portion 12, and the intermediate portion of the body portion 602 located from the step portion 640 to the terminal 2A side has the cylinder - 77 portion 641 of a substantially perfect circle, the fitting hole 672 of the annular waterproof packing 670 is formed so that it can be fitted to the cylinder portion 641 of the body portion 602. When the annular waterproof packing 670 is mounted, the annular waterproof packing 670 is pinched between the lower surface of the step portion 640 and the opening edge portion 66 of the lamp holder 60, the fitting hole 672 is fitted to the cylinder portion 641, the outer peripheral surface 571B of the annular waterproof packing 670 is engaged with the opening edge portion 66 of the lamp holder 60 to form the waterproof structure, and the annular waterproof packing 670 is pressed against the opening edge portion 66 side by the step portion 640, whereby the annular waterproof packing 670 can be prevented from dropping off the lamp holder 60. Therefore, liquid flowing from the heat radiation fin 25 side to the annular waterproof packing 670 side can be prevented from intruding into the gap between the annular waterproof packing 670 and the opening edge portion 66 and the body portion 602, and the waterproof performance between the LED lamp 601 and the lamp holder 60 can be enhanced. [0127] Furthermore, as shown in Fig. 30, a step portion 6540 which makes a circuit of the outer periphery of the body portion 2 may be provided at the upper side of the conical portion 41 of the fifth embodiment. In this case, the annular waterproof packing 670 is pressed against the opening edge portion 66 side of the lamp holder 60 by the conical portion 41, and the annular - 78 waterproof packing 670 is pressed against the opening edge portion 66 by the lower surface of the step portion 6540, whereby the waterproof performance between the LED lamp 501 and the lamp holder 60 can be enhanced. Furthermore, the lower surface of the step portion 6540 comes into close contact with the upper surface 571C of the annular waterproof packing 670, whereby intrusion of liquid to the conical hole 572 side can be prevented, and the waterproof performance can be further enhanced. [0128] <Seventh Embodiment> In the fifth embodiment, it is described that the conical portion 41 of the body portion 2 is fitted to the conical hole 572 of the annular waterproof packing 570, whereby the waterproof performance between the body portion 2 and the annular waterproof packing 570 is enhanced. However, in this embodiment, the construction that waterproof is performed by using the packing 94 for an electrical bulb described with reference to Fig. 25 will be described. In this embodiment, the same members as the fifth embodiment are represented by the same reference numerals, and the description thereof is omitted. [0129] Fig. 31 is a cross-sectional view showing the internal construction of the LED lamp device 7300 according to this embodiment. As shown in Fig. 14, the LED lamp device 7300 is configured to have an LED lamp 701, a lamp holder 60, and the packing 94 - 79 for an electrical bulb interposed between the LED lamp 701 and the lamp holder 60. The LED lamp 701 has a body portion 2, an insulating cylinder portion 10 is provided to the terminal 2A thereof and a base 3 is provided to the insulating cylinder portion 10. [0130] A plurality of heat radiation fins 725 erected from the back surface 13A of the base plate 13 to the terminal 2A side are provided on the outer peripheral surface of the body portion 2. The heat radiation fins 725 are formed like plates whose surfaces are in parallel to a plane extending in parallel to the axial line of the body portion 2, and arranged so as to be spaced from one another at substantially regular intervals. A press plate 740 extending from the outer peripheral surface of the body portion 2 to the outside is continuously connected to the fin end portions 725B of the heat radiation fins 725. The press plate 740 is formed like a disc which is substantially parallel to the base plate 13, and disposed at an intermediate portion in the axial direction of the body portion 2. The outer diameter of the press plate 740 is formed to be large to the extent that it can press the whole of the electrical bulb packing 94. [01311 Under the state that the LED lamp 701 is secured to the lamp holder 60, the electrical bulb packing 94 is interposed between the lower surface of the press plate 740 and the opening edge portion 66 of the lamp holder 60. The electrical bulb packing - 80 94 is interposed while crushed by the fastening force between the base 3 and the socket 58, thereby securing the sealing performance. The inneredgeportionof thepressplate 740 is continuously connected to the outer peripheral surface of the body portion 2. Therefore, liquid intruding into the gap between the heat radiation fins 725 is not allowed to flow from the inner edge portion side of the press plate 740 to the base 3 side and thus it is discharged from the outer edge portion of the press plate 740 to the outside. That is, in this embodiment, the waterproof performance can be secured by providing the electrical bulb packing 94 between the press plate 740 and the opening edge portion 66, and it is unnecessary to provide a waterproof packing between the press plate 740 and the body portion 2, so that the number of places to be subjected to waterproof is reduced and the waterproof performance can be enhanced. As described above, the body portion 2 is provided with the press plate 740 whose size is set so that the electrical bulb packing 94 can wholly pressed by the press plate 740. Therefore, the waterproof of the LED lamp device 7300 can be performed by using the electrical bulb packing 94, and it is unnecessary to provide a waterproof packing dedicated to the LEDlamp 701. Therefore, the electrical bulb lamp 90 can be easily replaced by the LED lamp 701. [0132] The seventh embodiment is an embodiment to which the - 81 present invention is applied, and the present invention is not limited to the above embodiment. In the seventh embodiment, it is described that the press plate 740 is continuously connected to the fin end portions 725B. However, the present invention is not limited to this style. The press plate 740 may be provided below the fin end portions 725B so as to be away from the fin end portions 725B. As shown in Fig. 32, a curved surface portion 740A having substantially the same shape as the base portion 90A (Fig. 25) of the electrical bulb lamp 90 may be formed at the lower portion of the press plate 740, and the electrical bulb packing 94 may be pressed by the curved surface portion 740A. In this case, the electrical bulb packing 94 can be more properly pressed by the curved surface portion 740A which is formed in conformity with the shape of the electrical bulb packing 94, whereby the waterproof can be enhanced. Furthermore, it is described that the heat radiation fin 725 is configured like a plate having a surface in parallel to a plane extending in parallel to the axial line of the body portion 2, but the present invention is not limited to this style. For example, the heat radiation fins 725 may be formed like plates so as to radially extend around the axial line of the body portion 2 as in the case of the fifth embodiment. Or, a plurality of disc-shaped heat radiation fins 7625 parallel to the base plate 13 may be arranged from the base plate 13 side to the terminal - 82 2A side as shown in Fig. 33, and a press plate 740 may be provided below the heat radiation fin 7625 nearest to the terminal 2A side. The heat radiation fin 7625 nearest to the terminal 2A side may be used as a press plate. Furthermore, as shown in Fig. 34, the waterproof performance between the LED lamp 501 and the lamp holder 60 can be enhanced by using the annular waterproof packing 570 in place of the electrical bulb packing 94, swaddling the annular waterproof packing 670 to the opening edge portion 66 side of the lamp holder 60 by the conical portion 41 and pressing the annular waterproof packing 570 against the opening edge portion 66 by the press plate 740. Furthermore, the press plate 740 is brought into close contact with the upper surface 571C of the annular waterproof packing 570, whereby liquid can be prevented from intruding to the conical hole 572 side and thus the waterproof performance can be further enhanced. [0133] <Eighth Embodiment> With respect to the fifth embodiment, it is described that the annular waterproof packing 570 has the flange portion 571A and the outer peripheral surface 571B which come into contact with the opening edge portion 66. However, in this embodiment, the construction that the annular waterproof packing 870 also comes into contact with the outer peripheral surface of the opening edge portion 66 will be described. In this embodiment, the same members as the fifth embodiment - 83 are represented by the same reference numerals, and the description thereof is omitted. [0134] Fig. 35 is an enlarged cross-sectional view showing a fitting portion of the annular waterproof packing 870 of this embodiment. As shown in Fig. 18, the annular waterproof packing 870 has not only the flange portion 571A and the outer peripheral surface 571B, but also an annular outside seal portion 571D which is located at a further outer peripheral side as compared with the outer peripheral surface 571B and projects substantially in parallel to the outer peripheral surface 571B. The outer peripheral surface 571B, the flange portion 571A and the outside seal portion 571D are provided continuously with one another, whereby an annular groove 871 to which the opening edge portion 66 is fitted is formed at the outer peripheral portion 578 of the annular waterproof packing 870, and the outer peripheral surface of the opening edge portion 66 is also covered by the outside seal portion 571D. As described above, the annular waterproof packing 870 covers the outer peripheral surface of the opening edge portion 66, so that the waterproof performance between the annular waterproof packing 870 and the opening edge portion 66 can be enhanced. Furthermore, by providing the outside seal portion 571D, the rigidity of the annular waterproof packing 870 is enhanced, and the annularwaterproof packing 870 canbe prevented - 84 from being deformed by an effect of external force or the like, and thus the waterproof performance can be enhanced. [0135] <Ninth Embodiment> With respect to the LED lamp 901, the base plate 13 and the body portion 2 are subjected to coating material such as paint, chemicals or the like to enhance the weather resistance and design performance. In this coating process, at the root portions of the heat radiation fins 25 extending from the body portion 2, a closed space is formed among the adjacent heat radiation fins 25andthebodyportion2. Therefore, itisdifficult for paint to intrude into this space, so that unevenness in coating or paint back occurs. Furthermore, when the coating amount increases, paint sag occurs in front of the heat radiation fins 25, etc. Therefore, the coating of paint or the like is performed little by little while the coating process is divided into plural steps. Therefore, there is a problem that the coating frequency increases and thus the cost increases. Therefore, in this embodiment, an LED lamp 901 on which coating of paint or the like can be easily performed will be described. In this embodiment, the same members as described with reference to the first to eighth embodiments are represented by the same reference numerals, and the descriptions thereof is omitted. [0136] Fig. 36 is a diagram showing an LED lamp device 9100 having - 85 an LED lamp 901 according to this embodiment. The LED lamp device 9100 shown in Fig. 36 is an outdoor mount type lighting device used for lighting of outdoor billboards or the like, and has an LED lamp 901, a lamp holder 60 described with reference to the first embodiment, etc., and an annular waterproof packing 970 secured to the LED lamp 901. The annular waterproof packing 970 is formed of a rubber molded member as in the case of the annular waterproof packing 70 of the first embodiment. The annular waterproof packing 970 is mounted freely detachably mounted on the body portion 2 of the LED lamp 901, and it blocks the opening of the lamp holder 60 and prevents intrusion of water from the gap between the lamp holder 60 and the LED lamp 901 when the LED lamp 901 is mounted in the lamp holder 60. The annular waterproof packing 970 is used to prevent intrusion of water into the lamp holder 60. Therefore, it is unnecessary to mount the annular waterproof packing 970 when no waterproof is required, for example, when the LED lamp 901 is mounted in the lamp holder 60 disposed indoors or in a socket exposed to the outside. However, intrusion of dust or the like can be prevented by mounting the annular waterproof packing 970 under indoor use. [0137] Next, the construction of the Led lamp 901 will be described in detail. Fig. 37 is a perspective view showing the exterior - 86 appearance construction of the LED lamp 901 according to the embodiment, wherein Fig. 37 (A) is an exterior appearance perspective view taken from the upper side, and Fig. 37 (B) is an exterior appearance perspective view taken from the lower side. Fig. 38 is a diagram showing the exterior appearance construction of the LED lamp 901, wherein Fig. 38 (A) is a plan view, Fig. 38 (B) is a side view, and Fig. 38(C) is a bottom view. Fig. 39 is an exploded perspective view of the LED lamp 901 taken from the upper side, and Fig. 40 is an exploded perspective view of the LED lamp 901 taken from the lower side. Fig. 41 is a cross-sectional view taken along I-I line of Fig. 38(B). [0138] The LED lamp 901 of this embodiment is constructed as a beam lamp type having a light condensing property for light distribution, and it has a light emitting portion 12, a body portion 2 as a cylindrical portion which extends downwards substantially from the center of the back surface of the light emitting portion 12 substantially vertically and is provided with a base 3 at the terminal thereof, and plural heat radiation fins 25 provided to the back surface of the light emitting portion 12. Furthermore, the annular waterproof packing 970 is fitted to the body portion 2. The light emitting portion 12 of this embodiment emits light upwards substantially from the whole of the upper surface 12A, and it has plural LEDs 15, an LED board 516, an optical component 46 for the beam lamp, a cover 22, and a base plate - 87 13 as a flat-plate portion which is integrally provided to the tip 2B of the body portion 2. The base plate 13 is configured to have the same construction as described with reference to the first embodiment, and as shown in Figs. 39 to 41, the LED board 516 is fixed to the upper surface of the base plate 13 by screws. [0139] The optical component 46 for the beam lamp is an optical component for controlling light distribution of the light emitting portion 12 of the LED lamp 901. The optical component 46 is formed as one member covering each of LEDs 15, and controls the light distribution of light emitted from each LED 15 to emit the light from the upper surface 12A of the cover 22, whereby beam lamp type light distribution, that is, concentrated light distribution to the range of a predetermined beam divergence angle is implemented. The detailed construction of the optical component 46 for the beam lamp will be described later. [0140] The heat radiation fins 25 are radially provided around the body portion 2 when viewed from the back surface of the base plate 13. Each heat radiation fin 25 is provided so as to extend from the back surface of the base plate 13 along the body portion 2, and heat generated from the LED board 516 mounted on the base plate 13 is radiated. Each heat radiation fin 25 is formed integrally with the body portion 2 when injection molding of the housing 35 is carried out. [0141] The LED board 516 have the same construction as the fifth - 88 embodiment, and substantially circular copper foil 83 as a heat radiation layer having electrical conductivity and thermal conductivity covers each of the front and back surfaces of the LED board 516 as shown in Figs. 38 to 40. Each copper foil 83 is formed to have such a size that the front and back surfaces of the LED board 516 are covered at maximum except for only a gap which enables electrical insulation between the copper foil 83 and the side wall 19 of the base plate 13 surrounding the LED board 516 and notches for performing insulation between the copper foil 83 and each screw 18 when the LED board 516 is screwed. [0142] The body portion 2 has the same construction as the first embodiment, etc. As in the case of the fifth embodiment, the electrical circuit board 8 which is covered around the periphery thereof with the insulating sheet 28 is accommodated in the body portion 2, and the upper end portion 8C of the electrical circuit board 8 is pressed through the fixing bush 27 by the LED board 516 and firmly fixed as shown in Fig. 41. As described above, the cooling pieces 27A which come into close contact with the body portion 2 are formed integrally with the fixing bush 27, and heat of the exposure portion 16A is transferred to the body portion 2 through the cooling pieces 27A of the fixing bush 27 (more accurately, the outer peripheral surface 36 on which the cooling pieces 27A are brought into contact with the body portion 2), whereby the temperature of the exposure portion 16A is prevented from excessively increasing.

- 89 Furthermore, the heat generated fromthe electrical circuit board 8 is also transferred to the body portion 2 through the fixing bush 27 and radiated. [0143] As described above, the housing 35 containing the body portion 2 and the base plate 13 is integrally provided with the plural heat radiation fins 25, whereby the housing 35 keeps heat radiation properties. Each of the heat radiation fins 25 is configured like a thin plate, and many heat radiation fins 25 are erected and radially arranged around the axial line of the body portion 2 when viewed from the back surface of the base plate 13. With respect to these heat radiation fins 25, the fin end portions 25B at the root portions of the heat radiation fins 25 (hereinafter referred to as "fin root portions", and represented by the same reference numeral in this embodiment) connect to the back surface 13A of the base plate 13, and the heat radiation fins 25, the body portion 2 and the base plate 13 are formed integrally with one another from the thermally conductive resin described above by resin molding using a metal mold. As described above, the base plate 13 and the heat radiation fins 25 are integrally molded, whereby the heat resistance between the base plate 13 and the heat radiation fin25 is suppressed, andtheamountof heattransfer to the heat radiation fins 25 is increased, so that high heat radiation performance can be obtained. [0144] As shown in Fig. 36, the heat radiation fins 25 is formed - 90 to have a sectorial shape in side view as if a moderate arc is drawn from the back surface 13A of the base plate 13 (Fig. 37) to the opening edge portion 66 of the holder housing 62, and when the LED lamp 901 is mounted in the lamp holder 60, the sense of unity between the LED lamp 901 and the lamp holder 60 is enhanced, and the design performance is enhanced. As shown in Fig. 6, the fin tip 25A of each heat radiation fin 25 is formed horizontally (vertically to the axial line of thebodyportion2), andthe annular waterproof packing 970mounted on the body portion 2 comes into contact with the fin tips 25A. [0145] As shown in Figs. 36to 41, the annular waterproof packing 970 forms a substantially truncated conical shape (trapezoidal shape in cross-section) in side view which is continuous with the arc drawn by the outer shape 25D of the heat radiation fin 25, and the contour shape comprising the heat radiation fins 25 andthe annularwaterproof packing 970 is set tobe substantially identical to the contour shape of a glass ball of an existing electrical bulb, thereby preventing a disadvantage which occurs due to the difference in shape when the existing electrical bulb is replaced. [0146] Next, a process of manufacturing the housing 35 of this embodiment will be described. As described above, the housing 35 is manufactured by resin molding, thermally conductive resin is used for the components constituting the base plate 13, the heat radiation fins 25 and - 91 the body portion 2, and insulating resin is used for the insulating cylinder portion 10. Therefore, the resin molding of the housing 35 is performed by the two-color molding or the insert molding. [0147] After the resin molding of the housing 35 is carried out, the surface thereof is coated with paint or chemicals to enhance the weather resistance or the design performance. Inthis coating process, with respect to a conventional generally constructed LED lamp, the heat radiation fins 25 radially extend from the body portion 2, and the end portions at the base plate 13 side of the heat radiation fins 25 are connected to the back surface of the base plate 13. Therefore, there is a problem that it is difficult for paint to intrude to the corner portions between the body portion 2, the heat radiation fins 25 and the base plate 13, and paint sag occurs in front of the fins when the coating amount is increased. Therefore, in this coating process, it is necessary to coat paint or the like little by little while the step is divided into plural times, which causes increase in coating frequency and thus in cost. This problem is solved to some degree by separating the heat radiation fins 25 from the back surface of the base plate 13 to provide a gap therebetween. Inthiscase, the heat radiation performance of the base plate 13 which receives the heat generated from the LED board 516 is lowered, so that high output type LED cannot be used as LED 15. [0148] Therefore, in the LED lamp 901 of this embodiment, all - 92 the heat radiation fins 25 are separated from the body portion 2, whereby the liquid pooling problem in the coating process is solved without deteriorating the heat radiation performance of the base plate 13. That is, as shown in Fig. 41, a separation portion 97 for separating each heat radiation fin 25 and the body portion 2 from each other is provided between each of all the heat radiation fins 25 and the body portion 2 from the fin root portion 25B as the root portion of the heat radiation fin 25 as the connection place to the base plate 13 to the fin end portion 25A as the fin tip ("the fin end portion 25A" will be hereinafter referred to as "fin tip 25A" in this embodiment) , whereby a gap is provided between each heat radiation fin 25 and the body portion 2. [0149] Accordingly, in the step of coating paint to the housing 35, no liquid pool occurs between the heat radiation fin 25 and the body portion 2. Therefore, the coating frequency can be reduced by increasing the amount of liquid to be coated at each coating time, and thus the paint can be easily coated on the housing 35 without unevenness. Particularly, paint is sprayed by using a spray or the like, whereby the paint goes around the periphery of the body portion 2 through the separation portion 97 and thus the paint can be uniformly coated in a broad range in one coating step. Furthermore, by providing the separating portion 97, the weight of the housing 35 can be reduced, and the cost of materials - 93 can be suppressed. Furthermore, rain water or the like is not pooled between the heat radiation fin 25 and the body portion 2 when the LED lamp 901 is used. In the conventional construction that the heat radiation fins 25 are radially mounted from the body portion 2, the number of mountable heat radiation fins 25 is limited to the number which is obtained by dividing the outer peripheral length of the body portion 2 by the minimum moldable thickness of the fin root portion 25B of the heat radiation fin 25. By separating the heat radiation fins 25 from the body portion 2, the number of the heat radiation fins 25 can be increased, and the heat radiation performance can be enhanced. [0150] When the heat radiation fins 25 are configured to be separated from the body portion2, the strength of the heat radiation fins 25 is lowered as compared with the construction that the heat radiation fins are connected to the body portion 2. There is no flow of the material from the body portion 2 to the heat radiation fins 25 in the injection molding process, and the material flows from only the base plate 13. Furthermore, in the case of the resin mixed with thermally conductive fiber used in this embodiment, the flow of the material during molding is worse as compared with resin mixed with no thermally conductive fiber, and it is also difficult to control the injection pressure for performing solid molding till the tip of the thin fin shape - 94 without insufficient filling. When the number of heat radiation fins 25 is increased to enhance the heat radiation performance, the contact area between the metal mold and the resin increases during the molding process. As a result, unmolding performance of a molded product is deteriorated, and thus there is a drawback that the molding cycle time increases and thus the molding performance is deteriorated. Therefore, according to this embodiment, as shown in Figs. 36 to 40, all the heat radiation fins 25 are provided with reinforcing ribs 98 extending from the fin root portions 25B of the heat radiation fins 25 to the fin tips 25A thereof. By providing the heat radiation fins 25 with the reinforcing ribs 98, the same level strength as the case where the heat radiation fins 25 adhere to the body portion 2 can be obtained, and the flow of the resin can be improved, so that the molding performance is enhanced. Furthermore, when a product is taken out from the metal mold, an ejection pin of the metal mold can be made to abut against the rib end portion 99 of the reinforcing rib 98, so that the product can be surely taken out from the metal mold, and the product can be prevented from being damaged. [0151] Next, the construction of the optical component 46 for the beam lamp will be described in detail. As described above, in the LED lamp 901, the optical component 46 for the beam lamp is provided to the light emitting portion 12, and emitted light is concentrated and distributed - 95 in a predetermined beam spread angle range by the optical component 46 for the beam lamp. As shown in Figs. 38 to 41, the optical component 46 for the beam lamp is configured as a single optical component for covering all the LEDs 15 provided to the light emitting portion 12, and it is fixed to the base plate together with the LED board 516 by screws 18. [0152] Fig. 42 is a diagram showing the construction of the optical component 46 for the beam lamp, wherein Fig. 42(A) is a plan view, Fig. 42 (B) is a side view and Fig. 42 (C) is a bottom view. As shown in Fig. 42, the optical component 46 for the beam lamp has concentrated light distributing optical elements 47 each of which is provided every LED 15 mounted on the LED board 516 and located just above each LED 15, and a light transmissible plate portion 48 which covers the respective concentrated light distributing optical elements 47 and connects to the emission faces 47B of the respective concentrated light distributing optical elements 47. Athrough-hole 96 is provided substantially at the center in the plane of the light transmissible plate portion 48. [0153] Fig. 43 is an enlarged view showing one concentrated light distributing optical element 47. As shown in Fig. 43, the concentrated light distributing optical element 47 is disposed concentrically with the optical - 96 axis K of LED 15, and it is a light transmissible type optical element for converging light emitted from the LED 15 within a predetermined spread angle range and outputting the light concentrically. The optical element 47 is constructed by integrally molding a condenser 49 and a reflection surface 54 from transparent resin material. The condenser 49 is a plane-convex lens having a spherical incidence face 49A and a flat emission face 49B. The condenser 49 is disposed concentrically with the optical axis K while the incidence face 49A thereof is located just above LED 15, and it converges light Hi of LED 15 which is incident from the incidence face 49A and emits the light Hi from the emission face 49B so that the light Hi is incident to the light transmissible plate portion 48 which is formed integrally with and adjacently to the emission face 49B. A reflection face 54 is formed like a revolving surface (for example, paraboloid of revolution, spheroid or the like), and it is provided concentrically with the optical axis K so as to contain the condenser 49 and LED 15 therein, and reflects to the emission face 49B light H2 of LED 15 which deflects from the incidence face 49A of the condenser 49. [0154] According to this construction, most of light emitted fromLED 15 is incident to any of the condenser 49 and the reflection face 54 and output from the emission face 49B. Therefore, the utilization efficiency of LED 15 is enhanced, and the light - 97 distribution is controlled in each of the condenser 49 and the reflection face 54, so that excellent convergence of light is obtained. [0155] The shape of the concentrated light distributing optical element 47 will be described. The concentrated light distributing optical element 47 has such an exterior appearance shape that the bottom portion of the reflection face 54 is cut out substantially horizontally. A recess portion 54A in which LED 15 is accommodated is formed at the bottom portion of the reflection face 54, and the bottom surface of the recess portion 54A (the surface facing the LED 15) is formed substantially spherically, thereby forming the incidence face 49A of the condenser 49. In this embodiment, as shown in Fig. 43, the lens focal point P1 of the condenser 49 and the reflection face focal point P2 of the reflection face 54 are designed to be located at different positions on the optical axis K out of the recess portion 54A so that the reflection face focal point P2 is nearer to the recess portion 54A than the lens focal point Pl. [0156] At this time, the dimensions and shapes of the reflection surfaces 54 of the concentrated light distributing optical element 47 and the incidence face 49A of the condenser 49 are specified on the assumption that most of light emitted from the light emission face of LED 15 is allowed to be incident to the reflection surface 54 and the condenser 49 and incident light - 98 can be sufficiently converged and emitted with high collimation degree. However, since plural LEDs 15 are provided in the LED lamp 901, the dimension and shape of the concentrated light distributing optical components 47 cannot be set to the provided dimension and shape when LEDs 15 are arranged adjacently. [01571 On the other hand, for example when the arrangement interval of LEDs 15 is increased, the dimension and shape of the concentrated light distributing optical elements 47 can be set to the specified dimension and shape, but the light emitting portion 12 of the LED lamp 901 is large in size and the material cost of the housing 35 also increases. Furthermore, the concentrated light distributing optical element 47 can be provided to each LED 15 by sizing down each of the concentrated light distributing optical elements 47, but the dimension and shape thereof is deviated from the specified values. Therefore, there is a problem that the efficiency of utilization of LEDs 15 and the light convergence performance are deteriorated. [0158] Therefore, according to this embodiment, the concentrated light distributing optical elements 47 are configured to be interconnect to one another so that the reflection faces 54 of the adjacent concentrated light distributing optical elements 47 are overlapped with each other as shown in Fig. 42 and Fig. 44. Accordingly, the concentrated light distributing optical element 47 is provided to each LED 15 without sizing - 99 down each concentrated light distributing optical element 47, and the efficiency of utilization and light convergence performance of LEDs 15 can be suppressed from deteriorating. Furthermore, by interconnecting the concentrated light distributing optical elements 47, they can be treated as an unified optical component 46 for the beam lamp, easily handled and increased in structural strength. Particularly, the light transmissible plate portion 48 is integrally provided to the emission face 4 9B of each concentrated light distributing optical element 47, so that the structural strength can be further enhanced. [0159] However, with respect to the overlap between the reflection faces 54, when the overlap amount a (Fig. 44) is increased to the extent that the reflection face 54 of another concentrated light distributing optical element 47 invades into the condenser 49 of the concentrated light distributing optical element 47, the overlap area Va increases greatly, and the light convergence performance of the concentrated light distributing optical element 47 deteriorates greatly. Therefore, the overlap amount a of the reflection faces 54 is set to be limited to about a half of the heightAof the reflection faces 54 belowthe emission face 49B as the terminal of the condenser 49. When the convergence performance is neglected, the overlap amount a may be set to be larger than about a half of the height A of the reflection face 54 so that the reflection face 54 invades - 100 into the condenser 49. However, as shown in Fig. 44 and Fig. 45, light H3 invading into the overlap area Va in which the reflection faces 54 are overlapped with each other travels straightly without being reflected from the reflection face 54. Accordingly, when the overlap amount a increases excessively, the light distribution of the light H3 is not controlled, and the light H3 is emitted, which causes stray light. Accordingly, the overlap amount a is preferably set in such a range that the stray light caused by the light transmitted through the overlap area Va is not conspicuous (about 3/4 of the height A of the reflection face 54 as shown in Fig. 46 in the construction of this embodiment). [0160] According to the embodiment described above, the following effects can be obtained. That is, according to this embodiment, in the LED lamp 901 having the LED board 516 having LEDs 15 as light emitting elements mounted thereon, the base plate 13 as the flat-plate portion on which the LED board 516 is mounted and the body portion 2 as the cylinder portion which extends from the back surface 13A of the base plate 13 and is provided with the base 3 at the terminal 2A thereof, the plural heat radiation fins 25 extending along the body portion 2 are provided on the back surface 13A of the base plate 13, and the gap is provided between each heat radiation fin 25 and the body portion 2 so as to extend from the fin root portion 25B as the root portion of the heat radiation - 101 fin 25 to the fin tip 25A of the heats radiation fin 25. According to this construction, in the process of coating paint to the housing 35 containing the base plate 13, the body portion 2 and the heat radiation fins 25, no liquid pooling occurs between each heat radiation fin 25 and the body portion 2, so that the coating frequency can be reduced by increasing the amount of liquid to be coated in each coating step, and the paint can be uniformly and simply coated on the housing 35. Particularly, the paint goes around the periphery of the body portion 2 through the separation portion 97 by spraying the paint through a spray or the like, so that the paint can be coated uniformly in a broad range by one coating step. Furthermore, by providing the separation portion 97, the weight of the housing 35 can be reduced, and the material cost can be suppressed. When the LED lamp 901 is used, rain water or the like is not pooled between the heat radiation fin 25 and the body portion 2. Still furthermore, in the conventional construction that the heat radiation fins 25 are radially provided from the body portion 2, the number of mountable heat radiation fins 25 is limited to the number which is calculated by dividing the outer peripheral length of the body portion 2 by the moldable minimum thickness of the fin root portion 25B of the heat radiation fin 25. However, by separating the heat radiation fins 25 from the body portion 2, the number of heat radiation fins 25 can be - 102 increased more greatly, and the heat radiation performance can be enhanced. [0161] Still furthermore, according to this embodiment, the reinforcing ribs 98 are provided from the fin root portions 25B to the fin tips 25A of the heat radiation fins 25. By providing the reinforcing ribs 98 to the heat radiation fins 25, the same level strength as the case where the heat radiation fins 25 are provided to the body portion 2 can be achieved, and also the flow of the resin is improved, so that the molding performance can be enhanced. Furthermore, when a product is taken out from the metal mold, the mold ejection pin is allowed to abut against the rib end portion 99 of the reinforcing rib 98, so that the product can be surely taken out from the mold and also the product can be prevented from being damaged. [0162] Still furthermore, according to this embodiment, the beam lamp optical component 46 for concentrating and distribution light of the light emitting portion 12 having the plural LEDs 15 within a predetermined range has the concentrated light distributing optical elements 47 each of which is provided every LED 15 of the light emitting-portion 12, each concentrated light distributing optical element 47 being integrally provided with the condenser 49 for converging light incident from the incidence face 49A and emitting the light from the emission face 49B and the reflection face 54 for reflecting light deflected from the incidence face 49Ato the emission face 49B side, andthe reflection - 103 faces 54 of the adjacent concentrated light distributing optical elements 47 are overlapped with each other. [0163] According to this construction, in a case where the dimension and shape of the concentrated light distributing optical element 47 is designed so that light emitted from LED 15 is sufficiently converged by the condenser 49 and light which is not incident to the condenser 49 is sufficiently reflected from the reflection face 54, when the arrangement interval of LEDs 15 is narrower than the dimension of the concentrated light distributing optical element 47, each LED 15 can be provided without sizing down the concentrated light distributing optical element 47, and the convergence performance and the efficiency of utilization of LEDs 15 can be suppressed from decreasing. [0164] Furthermore, according to this embodiment, the plate-like light transmissible plate portion 48 which integrally covers each of the concentrated light distributing optical elements 47 is provided on each of the emission faces 49B of the concentrated light distributing optical elements 47. Accordingly, the respective concentrated light distributing optical elements 47 can be firmly interconnected to one another. [0165] <Tenth Embodiment> In the above embodiment, the beam lamp type LED lamp 901 for concentrating and distributing light in a predetermined beam spread angle range has been described. On the other hand, in - 104 this embodiment, an LED lamp 1001 in which light distribution is broader will be described. [0166] Fig. 47 is a diagram showing the exterior appearance construction of the LED lamp 1001 according to this embodiment, wherein Fig. 47(A) is a plan view, Fig. 47(B) is a side view andFig. 47(C) isabottomview. Fig. 48 isanexplodedperspective view of the LED lamp 1001 taken from the upper side, and Fig. 49 is an exploded perspective view showing the LED lamp 1001 taken from the lower side. Fig. 50 is a cross-sectional view taken along I-I line of Fig. 47 (B) . In these figures, the corresponding members described with reference to the ninth embodiment are represented by the same reference numerals, and the description thereof is omitted. As shown in these figures, the LED lamp 901 described in the ninth embodiment has the optical component 46 for the beam lamp at the light emitting portion 12. However, this embodiment is different in that the LED lamp 1001 of this embodiment has the reflector 21 at the light emitting portion 12 as in the case of the fifth embodiment. [0167] That is, in the LED lamp 1001 of this embodiment, the light distribution for irradiating light in a broad range (spread type light distribution) is performed by detaching the optical component 46 for the beam lamp from the light emitting portion 12. However, the base plate 13 is designed like a tray, and thus a part of emitted light of LED 15 in the tray is shielded - 105 by the side wall 19. Therefore, in this embodiment, the reflector 21 is provided to the light emitting portion 12 so that a light beam component shielded by the side wall 19 is directed to the cover 22 side and allowed to be effectively used for lighting. Specifically, the reflector 21 has a reflection face 21A which extends along the side wall 19 of the base plate 13, forms an annular shape surrounding each LED 15 and reflects to the cover 22 side the light beam component which is incident from each LED 15 to the side wall 19. [0168] As described above, in this embodiment, the light emitting portion 12 is provided with the reflector 21, whereby the efficiency of the LED lamp 901 is increased, and spread of light in the horizontal direction (the direction parallel to the plane of the LED board 516) is suppressed. A high reflection grade material is used for the reflection face 21A of the reflector 21 to obtain high reflectivity, but material based on aluminum deposition or the like may be used. The cover is added with diffusing agent so that the light distribution does not vary even when the reflection face 21A is limited. However, the cover may be subjected to shot. [0169] The respective embodiments described above merely show one aspect of the present invention, and any modification and application may be made without departing from the subj ect matter of the present invention.

- 106 Description of Reference Numerals [0170] 1, 300, 501, 601, 701, 901, 1001 LED lamp (lamp) 2, 102, 202, 302, 602 bodyportion (cylindrical portion) 2A terminal 2B tip 3 base 5 shell 8 electrical circuit board 10 insulating cylinder portion 12 light emitting portion 13 base plate (flat plate portion) 13A back surface 14 insertion opening 15 LED (light emitting element) 16, 516 LED board 16A exposure portion 19 side wall 20 heat radiation sheet for LED board 21 reflector 21A reflection face 25, 225, 325, 525, 725 heat radiation fin 25A fin end portion (fin tip) 25B fin end portion (fin root portion) 27 fixing bush 27A cooling piece (thermally conductive material) - 107 28 insulating sheet 35 housing 40 non-fin section 41 conical portion (intermediate portion) 52, 53 electrical circuit part 58 socket 60 lamp holder 62 holder housing 66 opening edge portion 70 570, 670, 870 annularwaterproof packing (waterproof packing) 71 seal piece 72 weight reducing recess portion 80 circuit pattern 81 cooling piece holding member 82, 82A heat generating component 83 copper foil 84, 84A slit 85 electrically conductive area 89 wire hole 90 electrical bulb lamp 97 separating portion 98 reinforcing rib 99 rib end portion 572 conical hole (inner peripheral portion) - 108 573 annular groove portion 574 drain groove (drain portion) 576 lip portion 578 outer peripheral portion 640, 6540 step portion 641 cylinder portion (intermediate portion) 672 fitting hole (inner peripheral portion) 5100, 6200, 7300, 9100 LED lamp device (lamp device)

Claims

1. A lamp comprising: a board on which light emitting elements are mounted; a flat plate portion on which the board is mounted; a cylinder portion that extends from the back surface of the flat plate portion and is provided with a base at a terminal thereof; and an electrical circuit board that is accommodated in the cylinder portion and on which electrical circuit components for turning on the light emitting elements are mounted, wherein a plurality of heat radiation fins extending from the back surface of the flat plate portion through the cylinder portion to the terminal side are provided, end portions at the terminal side of the heat radiation fins are located to be far away from the base to the flat plate portion side, and a gap is provided between each of the heat radiation fins and an outer peripheral surface of the cylinder portion from a root portion of the heat radiation fin to the end portion at the terminal side thereof.

2. The lamp according to claim 1, wherein the cylinder portion is formed through two-color molding or insert molding by using a resin material having high thermal conductivity for the flat plate portion side of the cylinder portion and a resin material having insulating properties for the terminal side of the cylinder portion.

3. The lamp according to claim 1, wherein an intermediate portion of the cylinder portion between each of the heat radiation fins and the base is configured to have a conical shape tapered to the terminal, the cylinder portion is inserted in an opening portion of a lamp holder disposed outdoors, a waterproof packing is mounted on the cylinder portion, an inner peripheral portion of the waterproof packing is configured in conical shape so as to be fitted to the intermediate portion, 9132464_1 110 the inner peripheral portion of the waterproof packing is fitted to the intermediate portion of the cylinder portion when the waterproof packing is mounted, and an outer peripheral portion of the waterproof packing is engaged with an opening edge portion of the lamp holder to form a waterproof structure.

4. The lamp according to claim 1, wherein a wire hole through which an anti-drop wire is passed is provided to some of the heat radiation fins.

5. The lamp according to claim 1, wherein a tip of the cylinder portion is opened in the plane of the flat plate portion, the electrical circuit board is inserted from the opening, a fixing groove portion for pinching a lower end portion of the electrical circuit board and an abutting piece against which one side of the electrical circuit board at a side confronting the lower end portion pinched in the fixing groove portion abuts are provided in the cylinder portion, and the electrical circuit board inserted from the opening is fixed by the pinching of the lower end portion in the fixing groove portion and the abutting of the abutting piece.

6. The lamp according to claim 5, further comprising a bush that is provided between the electrical circuit board accommodated in the cylinder portion and the back surface of the board mounted on the flat plate portion, pressed against the back surface of the board to come into contact with the electrical circuit board, and transfers heat of the electrical circuit board to the cylinder portion.

7. The lamp according to claim 1, wherein the inner side surface of the cylinder portion is covered by an insulating sheet.

8. An optical component that is provided to the lamp according 9132464_1 111 to claim 1 or 2 and concentrates and distributes light of a plurality of light emitting elements provided to the lamp in a predetermined range, wherein an optical element which is integrally provided with a lens for converging light incident from an incidence face and emitting the converged light from an emission face, and a reflection face for reflecting light deflected from the incidence face to the emission face side is provided every light emitting element, and the reflection faces of the adjacent optical elements are overlapped with each other. Iwasaki Electric Co., Ltd. Patent Attorneys for the Applicant SPRUSON & FERGUSON 9132464_1