JP6554913B2 - lamp - Google Patents

Description

  The present invention relates to a lamp that includes a light emitting element such as an LED or an organic EL in a light source and can be mounted on an existing socket.

2. Description of the Related Art In recent years, light bulb-type LED lamps that can be used as a substitute for light bulbs have become widespread with the increase in output and cost of LEDs. In general, this type of LED lamp has an LED board on which an LED is mounted mounted on a flat disk, and a cylindrical body containing an electric circuit board such as a power circuit is connected to the back of the flat disk. In addition, a base is provided at the end of the body portion with an insulating portion interposed therebetween (see, for example, Patent Document 1 and Patent Document 2).
Conventionally, in order to provide a thermally conductive resin molded article having excellent thermal conductivity and electrical insulation, a method of integrally molding an electrical insulating layer and a thermally conductive layer by a two-color molding method has been proposed (for example, And Patent Document 3).

JP 2010-010134 A JP 2009-206104 A JP 2010-264740 A

By the way, the body part of the LED lamp is formed of an amorphous resin having excellent heat dissipation, and the insulating part made of crystalline resin is integrally formed at the end of the body part, thereby having both heat dissipation and insulation. It is conceivable to provide a body part. However, when dissimilar resins such as crystalline resin and non-crystalline resin are integrally molded by two-color molding or insert molding, due to the difference in their melting temperature and the difference in thermal expansion coefficient, There was a problem that the nature was not good.
This invention is made | formed in view of the situation mentioned above, and provides the LED lamp which can improve the joining property of the junction part which integrally molded the different resin material.

In order to achieve the above object, the present invention provides a substrate on which a light emitting element is mounted, a flat plate portion on which the substrate is placed, a trunk portion extending from the back surface of the flat plate portion, and a terminal end of the trunk portion. A base connected via an insulating tube portion provided, wherein the body portion and the tube portion are integrally formed from different resins, and the body portion is The resin forming the cylindrical portion is made of an amorphous resin having better heat dissipation than the cylindrical portion, and the molding shrinkage rate is larger than that of the resin forming the trunk portion. The terminal part joined to the part is provided with a curved part bent at least in the radial direction, and the curved part is integrally formed by insert molding so as to be surrounded by the cylindrical part from the top and bottom and inside and outside directions.

  According to the present invention, in the lamp, the body portion is formed of an amorphous resin having better heat dissipation than the tube portion, and the tube portion has crystallinity superior in chemical resistance than the body portion. It was formed from the resin of this.

  According to the present invention, in the lamp described above, the body portion is formed of polycarbonate, and the cylindrical portion is formed of polybutylene terephthalate.

  According to the present invention, the substrate on which the light emitting element is mounted, the flat plate portion on which the substrate is placed, the body portion extending from the back surface of the flat plate portion, and the insulating material provided at the end of the body portion. A lamp having a base connected via a tube portion, wherein the body portion and the tube portion are integrally formed from different resins, and the body portion is joined to the tube portion. In addition, a curved portion bent at least in the radial direction is provided, and the curved portion is formed so as to be surrounded by the cylindrical portion from above and below and from inside and outside. According to this configuration, since the cylindrical portion is formed so as to surround the curved portion at the end of the body portion from above and below and from inside and outside, the gap between the joining surfaces due to the difference in molding shrinkage does not occur, and the joining surfaces are brought into close contact with each other. be able to. Therefore, it is possible to improve the bondability of the joint portion when different types of resin materials are integrally formed.

It is a figure which shows the external appearance structure of the LED lamp which concerns on embodiment of this invention, (A) is a top view, (B) is a side view, (C) is a bottom view. It is a perspective view which decomposes | disassembles and shows an LED lamp. It is sectional drawing which shows the internal structure of a LED lamp. It is a top view of a base board. It is a figure which shows the joining structure of a trunk | drum part and a cylinder part, (A) is a figure which shows an example of the shape of a curved part, (B) is a figure which shows another example of the shape of a curved part. It is sectional drawing of a cylinder part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following embodiments, an LED lamp having an LED as a light source is exemplified as a lamp having a light emitting element as a light source. However, the present invention is not limited to this, and other light emission such as an organic EL, for example. The present invention can also be applied to a lamp having an element as a light source.

FIG. 1 is a diagram showing an external configuration of an LED lamp 1 according to the present embodiment, in which FIG. 1 (A) is a plan view, FIG. 1 (B) is a side view, and FIG. 1 (C) is a bottom view. FIG. 2 is an exploded perspective view showing the LED lamp 1. FIG. 3 is a cross-sectional view showing the internal configuration of the LED lamp 1.
As shown in these drawings, the LED lamp 1 is configured to have substantially the same shape and optical characteristics as an existing light bulb, and can be used as an alternative to the existing light bulb.

  That is, as shown in FIG. 1, the LED lamp 1 has a substantially cylindrical body portion 2 formed of a material having high thermal conductivity. A light emitting portion 12 is provided at the front end 2C (see FIG. 3) of the body portion 2, and a cylindrical insulating cylinder portion 10 formed of an insulating material is provided at the terminal end 2A. A base 3 is attached to the terminal end 10 </ b> A (FIG. 2) of the insulating cylinder portion 10. The base 3 is provided with a cylindrical shell 5 threaded into an existing socket (not shown, for example, E26 type socket) and an insulating portion 6 on the top of the end of the shell 5. The shell 5 and the eyelet 7 are configured to have a shape and size that can be attached to the socket. Thereby, the said LED lamp 1 can be mounted | worn with the socket of the lamp holder which mounts and uses the existing socket and the existing light bulb, and can use it as an alternative of the existing light bulb.

  The light emitting unit 12 includes a plurality of LEDs 15 as a light source. As shown in FIGS. 2 and 3, the electric circuit board 8 on which an electric circuit such as a driver circuit and a power circuit required for lighting the LEDs 15 is mounted It is disposed in the tube portion 10. The power circuit of the electric circuit board 8 and the shell 5 and the eyelet 7 of the base 3 are electrically connected by lead wires 9A and 9B, respectively, and the power from the socket is electrically connected through the shell 5 and the eyelet 7. The power is supplied to the power circuit of the circuit board 8.

  The shell 5 and the body portion 2 are electrically insulated by the insulating cylinder portion 10, and the shell 5 and the body portion 2 of the base 3 are formed even if the shell 5 and the body portion 2 are made of a conductive material to improve the heat dissipation of the body portion 2. It is comprised so that the insulation between can be maintained favorably. In this embodiment, although details will be described later, the body 2 is formed from a heat conductive resin, the insulating cylinder 10 is formed from an insulating resin, and the body 2 and the insulating cylinder 10 are insert-molded. Yes. The body part 2 and the insulating cylinder part 10 may be formed by two-color molding.

  By forming the body part 2 from a heat conductive resin, the LED lamp 1 can be lighter than when the base plate 13 and the body part 2 are formed of a metal material such as aluminum, and the LED lamp 1 can be used as an alternative to a light bulb. Even when the lamp is mounted on an existing socket or an existing lamp holder, there is no need to reinforce the existing socket or the existing lamp holder in order to support the weight of the LED lamp 1, and it can be used instead. . Moreover, since the number of later-described radiating fins 25 can be increased by reducing the weight, the surface area can be increased and the heat dissipation can be improved more efficiently. As such a heat conductive resin, for example, a polycarbonate resin mixed with a high heat conductive carbon fiber (Lajema (registered trademark) manufactured by Teijin Limited in this embodiment) can be suitably used. Further, the body part 2 and the insulating cylinder part 10 are integrally formed by insert molding of a resin material, so that the joining becomes strong.

As shown in FIG. 3 and FIG. 4, an introduction hole portion 32 whose diameter increases toward the body portion 2 side is formed at the terminal end 10 </ b> A of the insulating cylinder portion 10. In the introduction hole portion 32, wiring holes 31A and 31B penetrating the terminal end 10A are formed.
The lead wires 9A and 9B are connected to the end of the electric circuit board 8 on the base 3 side, and are connected to the shell 5 and the eyelet 7 through the wiring holes 31A and 31B, respectively. The lead wire 9 </ b> A drawn out from the wiring hole 31 </ b> A is bent outward at the terminal end 10 </ b> A of the insulating tube portion 10, extends along the outer surface of the insulating tube portion 10, and is connected to the shell 5. On the other hand, the lead wire 9B drawn out from the wiring hole 31B extends straight as it is and is connected to the eyelet 7. When attaching the base 3 to the insulating cylinder portion 10, the shell 5 is caulked and fixed to the insulating cylinder portion 10 from the outer peripheral side with the shell 5 engaged with the terminal end 10 </ b> A of the insulating cylinder portion 10.

Next, the light emitting unit 12 of the LED lamp 1 will be described in detail.
As described above, the light emitting unit 12 is provided at the tip 2C on the opposite side of the base 3 in the body 2. The light emitting unit 12 has a plate-like base plate 13, and an LED substrate 16 on which a plurality of LEDs 15 are mounted is provided on the upper surface of the base plate 13. The base plate 13 is a substantially disk-shaped member having a larger diameter than that of the body portion 2 when viewed from above, and the front end 2C of the body portion 2 is connected to the back surface A. The base plate 13 and the body portion 2 are integrally formed from the same material, that is, a heat conductive resin material, and the base plate 13, the body portion 2, and the insulating cylinder portion 10 form the housing 35 of the LED lamp 1. Is configured.

FIG. 4 is a plan view of the base plate 13.
As shown in the figure, in the surface of the base plate 13, corresponding to the connecting part of the body part 2, a substantially circular shape (together with the body part 2 and the body part 2) for inserting the electric circuit board 8 into the body part 2. An insertion opening 14 having substantially the same diameter) is formed. As shown in FIG. 3, the electric circuit board 8 has a length extending from the distal end 2 </ b> C of the body portion 2 to the insulating cylinder portion 10 and has a front view shape that engages with the hollow shape of the body portion 2. ing.

As shown in FIG. 3, the diameter R of the body portion 2 is formed to be approximately the same as the lateral width of the electric circuit board 8, and inside the body portion 2, as shown in FIG. A fixing groove 51A that sandwiches the edge in the width direction of the electric circuit board 8 is provided on the end 2A side. Further, an abutting piece 51B extending from the distal end 2C side to the terminal end 2A side of the body portion 2 is provided at a position facing the fixing groove portion 51A.
When the electric circuit board 8 is inserted from the insertion opening 14, one edge 8D in the width direction of the electric circuit board 8 is sandwiched by the fixing groove 51A, and one side of the other edge 8E facing the one edge 8D is The electric circuit board 8 is fixed in the body portion 2 by being abutted against the side surface of the abutting piece 51B.

Further, as shown in FIG. 2, the upper end portion 8 </ b> C of the electric circuit board 8 is firmly fixed by being pressed by the LED board 16 described later via the fixing bush 27. In FIG. 3, the illustration of the fixed bush 27 is omitted. In addition, an insulating sheet 28 wound around the electric circuit board 8 is provided in the body part 2, and the insulating sheet 28 electrically connects the body part 2 and the electric circuit board 8. Insulated.
In particular, one edge 8D in the width direction of the electric circuit board 8 is sandwiched by the fixing groove 51A, and one side of the other edge 8E facing the one edge 8D is abutted against and fixed to the side surface of the abutting piece 51B. Thus, since the electric circuit board 8 is firmly fixed in the body part 2, an insulation distance between the body part 2 and the electric circuit board 8 can be reliably ensured.

  As the LED 15, for example, an LED formed by packaging an LED element such as SMD or COB can be suitably used. In the present embodiment, a white LED is used as the LED 15. Needless to say, an LED having a light emitting color other than white may be used for the LED 15. As shown in FIG. 2, a plurality of LEDs 15 are arranged on the LED substrate 16 which is a disc-shaped circuit substrate.

  As shown in FIG. 2, the LED substrate 16 is fixed to the base plate 13 with screws, and a lead wire lead-out opening 17 is formed at the approximate center thereof. A power supply anode and cathode lead wires (not shown) are drawn from the electric circuit board 8 inserted into the body 2 through a lead wire lead-out opening 17 and formed on the upper surface of the LED board 16. It is electrically connected to the circuit pattern 80, and power is supplied to each LED 15 through the circuit pattern.

As shown in FIGS. 2 and 3, the base plate 13 has a tray shape having a side wall 19 along the periphery, and a globe 22 that covers the LED substrate 16 is attached to the inner peripheral surface of the side wall 19. . A seal member 26 is provided between the globe 22 and the side wall 19, and the seal member 26 is sandwiched between the globe 22 and the side wall 19 as the globe 22 is inserted into the side wall 19. Thus, the waterproofness of the light emitting unit 12 is maintained by sandwiching the sealing member 26 between the globe 22 and the side wall 19.
Although not illustrated, the globe 22 is provided with the name of the LED lamp 1 on the inner surface by printing, engraving, or the like. Thereby, even if the LED lamp 1 is exposed to wind and rain, the name number does not disappear, and it does not disappear due to rubbing.

As shown in FIGS. 2 and 3, the light-emitting unit 12 reflects the light component Sa that is shielded from each LED 15 toward the side wall 19, and is extracted from the globe 22 so that it can be used for illumination. 21 is provided. The annular reflector 21 is formed with a reflecting surface 21 </ b> A that is disposed along the circumference of the base plate 13 so as to surround each LED 15 and reflects the light ray component Sa incident from the LED 15 toward the globe 22. By providing such a reflector 21, the light use efficiency of the LED lamp 1 is improved, and the spread of light in the horizontal direction (direction parallel to the surface of the LED substrate 16) is suppressed.
Note that the reflecting surface 21A of the reflector 21 has a high reflection grade so that a high reflectance can be obtained so that the light ray component Sa shielded from each LED 15 toward the side wall 19 can be extracted from the globe 22 and used for illumination. Although the material is used, aluminum vapor deposition or the like may be used. Further, the cover may be provided with diffusibility by adding a diffusing material, applying a texture, or performing a surface treatment such as shot blasting.

As shown in FIGS. 2 and 3, an LED board heat dissipation sheet 20 having an area equivalent to or smaller than the LED board 16 is sandwiched between the LED board 16 and the base plate 13. Heat generation is efficiently guided from the LED substrate 16 to the base plate 13 through the LED substrate heat-dissipating sheet 20, and is radiated from the entire casing 35 including the base plate 13 to the outside air. In addition, it is good also as a structure which coat | covers resin which consists of an elastic material which has heat dissipation performance for required thickness on the back surface of LED board 16, and is integrated, without using LED board heat dissipation sheet 20. The insulation performance may be imparted to the coating on the back surface of the LED board heat radiation sheet 20 or the LED board 16.
That is, since both the base plate 13 and the body portion 2 are integrally formed from a material having high thermal conductivity, the thermal resistance between the base plate 13 and the body portion 2 is small and led to the base plate 13. Heat is transmitted to the body part 2 with less loss.

Further, a metal plate having high thermal conductivity such as copper or aluminum may be installed between the LED substrate 16 and the base plate 13 instead of the LED substrate heat dissipation sheet. The heat from the LED board 16 is efficiently transmitted to the base plate 13, and the metal plate functions as a heat spreader to transmit the heat from the plurality of LEDs 15 to the entire base plate 13 and dissipate heat from the entire radiation fins 25 to increase the heat radiation efficiency. Can be raised.
In addition, a metal plate can be formed larger than the LED board 16, and a metal plate can also be utilized as a heat sink. At this time, the peripheral portion of the metal plate may be bent to increase the heat radiation area.

  A large number of plate-like heat radiation fins 25 extending radially from the front end 2 </ b> C to the end end 2 </ b> A are erected on the outer peripheral surface of the body portion 2 centering on the axis of the body portion 2. The heat is radiated from each heat radiating fin 25. Each radiating fin 25 has a fin end 25 </ b> A connected to the back surface 13 </ b> A of the base plate 13, and the radiating fin 25, the body portion 2, and the base plate 13 are integrally formed. As a result, heat transmitted to the body portion 2 is radiated from the radiation fins 25 without loss, and heat is also transmitted directly from the base plate 13 to the radiation fins 25, so that the amount of heat transferred to the radiation fins 25 increases. High heat dissipation performance can be obtained.

  Further, as described above, the diameter R of the body portion 2 is formed to be small enough to accommodate the built-in electric circuit board 8 (about the width of the electric circuit board 8), so that the contact area between the LED board 16 and the base plate 13 is reduced. The amount of heat transfer between the LED substrate 16 and the base plate 13 can be increased. In addition to this, since the difference in diameter between the base plate 13 and the body portion 2 also increases, the fin end portion 25A of the radiating fin 25 has a length extending from the body portion 2 to the edge portion (side wall 19) of the base plate 13. The contact area between the fin end 25A and the back surface 13A is also increased, and more heat can be guided to the radiation fins 25 and dissipated. Since the amount of heat transfer to the radiation fins 25 is ensured in this way, the radiation performance can be sufficiently maintained even if the thickness of the radiation fins 25 is reduced to, for example, 2.5 mm or less. The weight can be reduced by that amount.

Further, since the electric circuit board 8 is formed to have a length extending from the insulating cylinder portion 10 to the distal end 2C of the body portion 2, when the electric circuit board 8 is mounted on the body portion 2, as shown in FIG. A lower end 8 </ b> A of the substrate 8 is located in the vicinity of the base 3.
Therefore, for example, in this state, the portion corresponding to the finless section 45 of the body portion 2 and the insulating cylinder portion 10 is susceptible to thermal influence among the electric circuits of the electric circuit board 8 (should be protected from heat). As a configuration in which the electric circuit component is disposed, the electric circuit component can be protected from the heat of the heat radiation fin 25.

  In addition, the surface leakage of the body part 2 and the base plate 13 using an insulating paint can prevent the leakage to the casing 35 more reliably. However, if the surface of the base plate 13 is not coated and the surface roughness is high, the heat conduction of the body portion 2 is good. If sufficient insulation is ensured, the surface of the base plate 13 is moved to the surface. Insulation by painting is not always necessary.

  By the way, when the diameter R of the body part 2 is reduced to about the width of the electric circuit board 8, the electric circuit board 8 comes close to the body part 2, and an electrical connection between the body part 2 and the electric circuit board 8 occurs. Insulation performance deteriorates. Therefore, as described above, the body part 2 is provided with the insulating sheet 28 wound so as to surround the electric circuit board 8, thereby covering the entire inner surface of the body part 2 with the insulating sheet 28. It is supposed that the insulation performance between 8 and the trunk | drum 2 is improved. The insulating sheet 28 is formed by forming a single sheet having flexibility and insulation into a strip shape. When the insulating sheet 28 is attached to the body portion 2, the base sheet is wound in a cylindrical shape so that both ends of the sheet overlap each other. It is inserted from the insertion opening 14 of the plate 13. In the body part 2, the insulating sheet 28 expands by rewinding, and is mounted so as to cover the inner surface of the body part 2 by the rewinding force at this time. In this way, the insulating sheet 28 is formed in a band shape, inserted into the insertion opening 14 of the base plate 13 in a wound state, and mounted in the body part 2 by rewinding the insulating sheet 28, so that the body part 2 The insulating sheet 28 can be easily attached so as to cover the entire inner surface of the cover.

Next, a joint structure between the body part 2 and the insulating cylinder part 10 will be described.
The trunk | drum 2 is formed from the material excellent in heat dissipation, and as above-mentioned, it is formed from heat conductive resin. The body portion 2 is formed from an amorphous resin, and in the present embodiment, as described above, is formed from a polycarbonate mixed with carbon fiber having high thermal conductivity. The insulating cylinder part 10 is formed from crystalline resin. The insulating cylinder portion 10 is particularly preferably formed from a material having high insulating properties and excellent chemical resistance. Insulating cylinder part 10 is formed from PBT (polybutylene terephthalate) in this embodiment. As described above, the body portion 2 is formed from an amorphous resin, and the insulating cylinder portion 10 is formed from a crystalline resin. Examples of the amorphous resin include, in addition to polycarbonate, methacrylic resin, polystyrene, polyether, and the like. For example, polyacetal, polyethylene terephthalate, polyphenylene sulfide, and the like can be used as the crystalline resin in addition to polybutylene terephthalate.

  The insulating cylinder portion 10 is formed by insert molding at a terminal end 2A of the body portion 2 molded in advance. That is, the PBT insulating tube portion 10 is secondarily formed on the body portion 2 made of polycarbonate as a primary molded product. PBT and polycarbonate are different from each other in molding shrinkage ratio, so that the joint surface by insert molding is hardly adhered. In addition, since PBT and polycarbonate have different thermal expansion coefficients, there may be a gap in the joint surface due to thermal expansion / contraction caused by turning on / off the LED 15.

If a gap is generated in the joint surface between the body portion 2 and the insulating cylinder portion 10, the waterproofness of the LED lamp 1 is impaired. Therefore, in the present embodiment, as shown in FIG. 5A, a curved portion 200 is formed by bending the terminal end 2A in the inner diameter direction at the terminal end 2A of the body portion 2 joined to the insulating cylinder portion 10. As shown in FIG. 5C, the curved portion 200 is formed by bending the terminal end 2 </ b> A at least in the inner diameter direction of the body portion 2. Further, as shown in FIG. 5B, the curved portion 200 is bent to a side where the base 3 is further attached, and a first curved portion 200A obtained by bending the terminal end 2A in the inner diameter direction, and a terminal portion of the first curved portion 200A. The 2nd music part 200B may be provided.
As shown in FIGS. 5 (B) and 5 (C), the insulating cylinder portion 10 is formed so as to surround the curved portion 200 of the terminal end 2A of the body portion 2 from above and below and from inside and outside. The PBT forming the insulating cylinder portion 10 has a larger molding shrinkage rate than the polycarbonate forming the body portion 2. For this reason, the insulating cylinder part 10 wraps around the bending part 200 and shrinks by insert-molding the insulating cylinder part 10 so as to surround the bending part 200 from above and below and from inside and outside. According to this configuration, a gap does not occur on the joint surface between the body portion 2 and the insulating cylinder portion 10 due to molding shrinkage.

Further, even if the body portion 2 and the insulating cylinder portion 10 are expanded / contracted by turning on / off the LED 15, the curved portion 200 is encased in the insulating cylindrical portion 10, that is, the insulating cylindrical portion 10 is bent. Since the body part 2 and the insulating cylinder part 10 do not move independently, there is no gap in the joint surface between the body part 2 and the insulating cylinder part 10.
As a result, even in insert molding between different materials, the joint surface between the body portion 2 and the insulating tube portion 10 can be brought into close contact with each other, and a gap can be prevented from being formed on the joint surface. Performance can be improved. In the present embodiment, the end portion 2A of the body portion 2 is bent in the inner diameter direction to form the curved portion 200. However, the present invention is not limited thereto, and the end portion 2A of the body portion 2 is It can be enclosed from the inside and outside directions, and can have any shape that can be formed by injection molding.

By the way, when the electric circuit board 8 is inserted into the housing 35 and stored, the lead wires 9A and 9B connected to the lower end portion 8A of the electric circuit board 8 are connected to the wiring holes 31A and 31B via the introduction holes 32. It is necessary to pass through. If the hole diameters of the wiring holes 31A, 31B are small, the workability of the process of passing the lead wires 9A, 9B there is poor. On the other hand, if the hole diameters of the wiring holes 31A and 31B are larger, the lead wires 9A and 9B are easier to pass. However, if the hole diameter is larger, there is a problem that dust easily enters the housing 35 from the wiring holes 31A and 31B.
Therefore, in order to make it easier to pass the lead wires 9A and 9B through the wiring holes 31A and 31B without increasing the hole diameters of the wiring holes 31A and 31B, in this embodiment, as shown in FIG. It is formed in a funnel shape whose diameter increases toward the body part 2 side.

  The electric circuit board 8 is a board whose front and back surfaces can be used as mounting surfaces, electronic components are mounted on the front and back surfaces, and the lead wires 9A and 9B are connected to one mounting surface 108A of the electric circuit board 8. ing. As described above, electronic components that are susceptible to thermal influence are placed on the electric circuit board 8 on the lower end portion 8A side. Among these electronic components that are easily affected by heat, a component that is taller than other components, that is, an electronic component E that significantly protrudes from the mounting surface of the electric circuit board 8 as compared with other components, The lead wires 9 </ b> A and 9 </ b> B of the circuit board 8 are placed on the one mounting surface 108 </ b> A that is extended.

  As shown in FIG. 4, the wiring holes 31 </ b> A and 31 </ b> B are arranged side by side on a line Xa passing through the axial center of the body portion 2. The electric circuit board 8 is stored in the housing 35 with the width direction aligned in parallel with the line Xa and shifted from the axial center of the body 2. The introduction hole portion 32 is formed in a funnel shape whose diameter increases toward the body portion 2 side, but the ramp on the inclined surface 32 </ b> A on the side facing the one mounting surface 108 </ b> A of the electric circuit board 8 stored in the housing 35. As shown in FIG. 6, the inclination angle from the axis X is formed smaller than the inclination angle from the lamp axis X of the inclined surface 32B on the side facing the other mounting surface 108B. When the electric circuit board 8 is inserted into the housing 35, the lead wires 9A and 9B collide with the inclined surface 32A, are guided by the inclined surface 32A, and are inserted into the wiring holes 31A and 31B. The inclination angle of the inclined surface 32A from the ramp axis X is preferably set to 45 degrees or less. According to this configuration, the force applied when the lead wires 9A and 9B hit the inclined surface of the inclined surface 32A is inclined. The lead wires 9A and 9B can be easily inserted into the wiring holes 31A and 31B by this force.

  When the electric circuit board 8 is inserted into the housing 35, the width direction is made substantially parallel to the arrangement direction of the wiring holes 31A and 31B, and one mounting surface 108A from which the lead wires 9A and 9B are extended is formed. When the electric circuit board 8 is stored in the housing 35, the electric circuit board 8 is inserted toward a direction where a large space is available. According to this embodiment, the inclination angle from the ramp axis X of one inclined surface 32A toward the wiring holes 31A and 31B through the introduction hole 32 is smaller than the inclination angle from the ramp axis X of the other inclined surface 32B. By forming and inserting the lead wires 9A and 9B along the inclined surface 32A having a small inclination angle from the lamp axis X, the lead wires 9A and 9B can be easily inserted into the wiring holes 31A and 31B. Further, the electric circuit board 8 is inserted on the inclined surface 32B side having a large inclination angle from the lamp axis X so as to be shifted from the lamp axis X, and the mounting surface 108A facing the direction where a large space can be taken is taller than other components. Since the electronic component E is disposed, a space for accommodating the electronic component can be secured without extending the entire length of the insulating cylinder portion 10.

As described above, according to the LED lamp 1 of the present embodiment, the LED substrate 16 on which the LED 15 (light emitting element) is mounted, the base plate 13 (flat plate portion) on which the LED substrate 16 is mounted, An LED lamp 1 having a body part 2 extending from a back surface 13A of a base plate 13 and a base 3 connected via an insulating insulating cylinder part 10 provided at the end of the body part 2, 2 and the insulating cylinder part 10 are integrally formed from different resins, and the body part 2 is provided with a bent part 200 bent at least in the radial direction at the terminal end 2A joined to the insulating cylinder part 10. The bent portion 200 provided at the second end 2A is formed so as to be surrounded by the insulating cylinder portion 10 from above and below and from inside and outside.
According to this configuration, since the insulating cylinder portion 10 is formed so as to surround the curved portion 200 of the terminal end 2A of the body portion 2 from above and below and from inside and outside, the joining property can be improved. Further, even if the members are expanded / reduced by turning on / off the LED 15, the bent portion 200 of the terminal end 2 </ b> A of the body portion 2 is sandwiched inside the insulating cylinder portion 10, and therefore the terminal end 2 </ b> A of the body portion 2. And the insulating cylinder 10 do not move independently.

  Further, according to the LED lamp 1 of the present embodiment, the body portion 2 is formed of an amorphous resin that has better heat dissipation than the insulating tube portion 10, and the insulating tube portion 10 is more resistant than the body portion 2. It is formed from a crystalline resin with excellent chemical properties. According to this configuration, the heat dissipation of the body portion 2 can be improved, and heat can be efficiently guided from the body portion 2 to the radiation fins 25 to be radiated. Further, since the insulating cylinder portion 10 is formed of a resin having excellent crystalline chemical resistance, the insulating cylinder portion 10 is not deteriorated by a solvent or the like, and the insulation between the body portion 2 and the base 3 can be maintained. .

  Moreover, according to the LED lamp 1 of this embodiment, the trunk | drum 2 and the insulation cylinder part 10 were integrally molded by insert molding. According to this structure, since the insulating cylinder part 10 was integrally molded by insert molding in the trunk | drum 2 integrally molded with the base plate 13 and the radiation fin 25, the number of parts can be reduced and assembly property can be improved.

  Further, according to the LED lamp 1 of the present embodiment, the body portion 2 is formed of polycarbonate, and the insulating cylinder portion 10 is formed of polybutylene terephthalate. According to this configuration, the body portion 2 can have a structure excellent in thermal shock resistance, and the insulating cylinder portion 10 can have a structure excellent in chemical resistance.

  The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 LED lamp 2 Body part 2A Termination 2C Tip 3 Base 8 Electric circuit board 8A Lower end part 9A Lead wire 9B Lead wire 10 Insulating cylinder part 10A Termination 13 Base board 13A Back surface 15 LED
16 LED board 22 Globe 25 Radiation fin 31A Wiring hole 31B Wiring hole 32A Inclined surface 32B Inclined surface 35 Housing 108A Mounting surface 108B Mounting surface 200 Curved portion 200A First curved portion 200B Second curved portion

Claims (3)

Connected via a substrate on which a light emitting element is mounted, a flat plate portion on which the substrate is mounted, a trunk portion extending from the back surface of the flat plate portion, and an insulating cylinder provided at the end of the trunk portion A lamp having a base,
The trunk portion and the cylindrical portion are integrally molded from different resins,
The body part is formed from an amorphous resin having better heat dissipation than the cylinder part, and the resin forming the cylinder part has a larger molding shrinkage than the resin forming the body part,
The trunk portion includes a bent portion bent at least in a radial direction at a terminal end joined to the cylindrical portion,
The lamp is characterized in that the curved portion is integrally formed by insert molding so as to surround the tubular portion from above and below and from inside and outside. Prior Symbol cylindrical portion, the lamp according to claim 1, characterized in that it is formed from a high crystalline resin chemical resistance than the body portion. The lamp according to claim 1 or 2 , wherein the body portion is made of polycarbonate and the cylindrical portion is made of polybutylene terephthalate.

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