JP5204936B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device including a heating element, a heat conduction part that conducts heat from the heating element, and a heat radiation part that radiates heat from the heat conduction part.

  In general, a lighting device contains a heat source such as a light source and a power supply unit that supplies power to the light source. When the temperature of the heat generating component rises due to the heat generation of the heat generating component, there is a possibility that the performance of the heat generating component such as a light source such as a light emitting diode (hereinafter referred to as LED) and an electronic component constituting the power supply unit cannot be secured. Moreover, the temperature of the outer surface of the lighting device increases, which is not preferable from the viewpoint of safety. Therefore, conventionally, a lighting device configured to be able to dissipate heat from the heat-generating component to the air outside the lighting device has been proposed (see, for example, Patent Document 1).

  The illumination device disclosed in Patent Document 1 includes a light source unit 110 having a light source 111, a power source unit 130 that lights the light source 111, a power terminal block 140 that supplies power to the power source unit 130, a light source unit 110, and a power source unit. 130 and an appliance main body 120 provided with a power terminal block 140. The support 150 made of a spring material provided on the outer periphery of the appliance main body 120 is attached to the ceiling so that the light source 110 side becomes the installation hole side. It is installed and used as a so-called downlight (see FIG. 11). The instrument main body 120 has a substantially cylindrical shape, is provided at one end, is provided with a disk-like support part 121 that supports the light source part 110, and is provided at the other end. The power supply part 130 is accommodated together with the support part 121. And a disk-shaped attachment portion 122 that forms a space portion. One surface of the support portion 121 is fixed with screws in a state where the wiring board 112 on which the light source 111 is mounted is in contact. The other surface of the support part 121 is fixed with screws in a state where the peripheral part of the wiring board 131 of the power supply part 130 is in contact with a support step part formed integrally with the support part 121. The instrument main body 120 is made of aluminum die-casting, and also serves as a heat radiating unit that radiates heat from the light source 111 and the power supply unit 130.

JP 2008-186776 A

  By the way, when a heat radiating portion is formed using a metal such as aluminum, the heat radiating performance is improved, but there is a problem that the lighting device becomes heavy. Therefore, in order to reduce the weight of the lighting device, it is conceivable to configure the heat radiating portion using a light material such as resin instead of metal. Patent Document 1 also discloses that a synthetic resin such as a high thermal conductive resin may be used as the material of the instrument body 120.

  However, in the fixture main body 120 of the lighting device according to Patent Document 1, the wiring board 131 of the power supply unit 130 is only brought into contact with the fixture main body 120 at the peripheral portion, and the heat transfer area that transfers heat from the power supply unit 130. Cannot be secured sufficiently. In general, since the high thermal conductivity resin has a lower thermal conductivity than metal, if only the material of the instrument body 120 is changed, the heat generated by the power supply unit 130 cannot be sufficiently conducted to the instrument body 120, There is a possibility that heat radiation cannot be sufficiently performed.

  This invention is made | formed in view of such a situation, and it aims at providing the illuminating device which can conduct the heat | fever from a power supply part (power supply circuit) favorably to a thermal radiation part.

  An illumination device according to the present invention includes a light source, a power supply circuit that supplies power to the light source, and a heat radiating portion that radiates heat from the power supply circuit housed inside to the outside air. A lighting device having a heat conducting part for conducting heat from the power supply circuit to the heat radiating part and a base provided at one end of the heat radiating part, wherein the heat radiating part extends from the one end to the other end. It has a thick truncated cone-shaped outer shape, and at least a part of the heat conducting part is buried and thermally connected to the heat conducting part.

  In the present invention, a thick cone made of an electrically insulating material and having a heat-radiating portion that radiates heat generated from the power supply circuit to the outside air is expanded from one end to the other end provided with the base. Because it is trapezoidal and conducts heat from the power supply circuit through a thermally conductive part that is at least partially embedded and thermally connected, a heat radiating part made of resin with low thermal conductivity was used. Even in this case, the heat conduction from the heat conducting portion can be improved and the heat radiation by the heat radiating portion can be effectively performed.

  In the lighting device according to the present invention, the heat conduction part includes a connection part that is thermally connected to the power supply circuit, and a fin that conducts heat from the power supply circuit to the heat dissipation part. The fin is embedded, and the fin has a shape that becomes wider from the one end to the other end.

  In the present invention, the heat conducting part has fins, and the fins are embedded in the heat radiating part. Therefore, heat conduction from the heat conducting part is further improved, and heat generated from the power supply circuit is passed through the heat radiating part. Heat can be effectively dissipated.

  The lighting device according to the present invention is characterized in that the heat conducting portion has a cylindrical portion that houses the power supply circuit therein, and the fin has a slit that engages with the cylindrical portion on the one end side. And

  In the present invention, since the fin provided in the heat conducting portion has a slit that engages with the cylindrical portion that houses the power circuit, the heat from the power circuit can be conducted well to the cylindrical portion. it can.

  The illumination device according to the present invention is characterized in that the light source is an LED and has a light bulb shape.

  According to the present invention, heat from the power supply circuit can be favorably conducted to the heat radiating portion.

It is a typical external view of the illuminating device which concerns on Embodiment 1 of this invention. It is a typical disassembled perspective view of the illuminating device which concerns on Embodiment 1 of this invention. It is a typical cross-sectional view by the III-III line of FIG. It is a typical longitudinal cross-sectional view by the IV-IV line of FIG. It is a typical longitudinal cross-sectional view by the VV line of FIG. It is a typical enlarged view of the heat exchanger plate in Embodiment 1 of this invention. It is explanatory drawing of shaping | molding of the thermal radiation part in Embodiment 1 of this invention. It is explanatory drawing of shaping | molding of the thermal radiation part in Embodiment 1 of this invention. It is a typical cross section of the illuminating device which concerns on Embodiment 2 of this invention. It is a typical longitudinal cross-sectional view of the illuminating device which concerns on Embodiment 2 of this invention. It is a typical longitudinal cross-sectional view of the illuminating device which concerns on a prior art.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof, taking a light bulb type illumination device as an example.
(Embodiment 1)
FIG. 1 is a schematic external view of a lighting apparatus 100 according to Embodiment 1 of the present invention. FIG. 2 is a schematic exploded perspective view of lighting device 100 according to Embodiment 1 of the present invention. FIG. 3 is a schematic cross-sectional view of the lighting device 100 taken along line III-III in FIG. FIG. 4 is a schematic longitudinal sectional view of the illumination device 100 taken along line IV-IV in FIG. FIG. 5 is a schematic longitudinal sectional view of the illumination device 100 taken along the line V-V in FIG.

  As shown in FIG. 2, the illumination device 100 according to Embodiment 1 includes a light source module 1 in which a plurality of LEDs 12 that are light sources are mounted, a dome-shaped cover 8 that covers the light source module 1, and heat dissipation to which the light source module 1 is attached. The plate 2, the power supply circuit 6 for supplying power for driving the light source module, the heat transfer plate 5 on which the power supply circuit 6 is installed, and the heat transfer plate 5 are fitted, and the power supply circuit 6 is accommodated therein. The heat transfer cylinder 4, the heat conductive sheet 60 provided between the power supply circuit 6 and the heat transfer plate 5, and the heat radiating plate 2 are attached between the cover 8, and the heat transfer plate 5, the power supply circuit 6, The heat conductive sheet 60 and the heat radiating part 3 that accommodates the heat transfer cylinder 4 and the base 7 that is connected to the heat radiating part 3 and the heat radiating plate 2 on the opposite side are provided.

  As shown in FIGS. 2 and 4, the light source module 1 is formed by mounting a plurality of LEDs 12 as light sources on one surface of a disk-shaped LED substrate 11. The LED 12 is, for example, a surface mount type LED.

  The light source module 1 is attached to a heat sink 2 having a disk shape. The heat sink 2 is a good heat conductor, and is made of metal such as aluminum, for example. The light source module 1 is fixed to one surface 2a of the heat sink 2 on the other surface which is the non-mounting side surface of the LED substrate 11.

  The heat radiating plate 2 is attached to the heat radiating portion 3 on the other surface 2b. The heat radiating part 3 has a thick cylindrical shape, and has a truncated cone shape whose diameter is gradually increased from the base 7 side toward the cover 8 side. Screw holes (not shown) provided in the LED substrate 11, screw holes 21 provided in the heat radiating plate 2, and screw holes 31 provided in the expanded surface 3a on the cover 8 side of the heat radiating portion 3 The light source module 1 and the heat radiating plate 2 are placed on the surface 3a on the cover 8 side of the heat radiating portion 3 and the screws 15 are screwed into the screw holes so that the light source module 1 and the heat radiating plate 2 are aligned. Is fixed to the heat dissipating part 3.

  In the present embodiment, the heat radiating portion 3 is made of a resin excellent in heat dissipation and electrical insulation, so-called heat dissipation resin. The heat radiating resin is a resin having electrical insulation. The thermal conductivity of the heat radiation resin is, for example, about 1 to 70 (W / m · K). This heat radiating resin is made of, for example, a synthetic resin containing PBT (Polybutylene phthalate) as a base. Note that the heat-dissipating resin is not limited to a synthetic resin including PBT as long as it has electrical insulation.

  Since the LED substrate 11 and the heat radiating plate 2, and the heat radiating plate 2 and the heat radiating portion 3 are in contact with each other over substantially the entire surface, they have a sufficient heat transfer area. Therefore, the heat from the LED 12 which is a heating element is efficiently conducted to the heat radiating plate 2 through the LED substrate 11, and a part is radiated as it is from the peripheral portion of the heat radiating plate 2 to the air outside the lighting device 100, and the rest. The heat is efficiently conducted from the heat radiating plate 2 to the heat radiating portion 3 and is radiated from the heat radiating portion 3 to the air outside the lighting device 100. Since the heat is dissipated by the heat radiating plate 2 and the heat radiating portion 3, the LED 12 is cooled to a temperature necessary for ensuring predetermined performance and life. In addition, it is desirable that a heat conductive sheet or a thermally conductive grease is interposed between the LED substrate 11 and the heat radiating plate 2 and between the heat radiating plate 2 and the heat radiating portion 3.

  Inside the heat dissipating unit 3, a heat transfer cylinder 4 and a heat transfer plate 5 are provided as heat conducting units that conduct heat from a heating element such as the LED 12 and the power supply circuit 6 to the heat dissipating unit 3. The heat transfer cylinder 4 and the heat transfer plate 5 are heat good conductors, and are made of metal such as aluminum, for example.

  The heat transfer cylinder 4 has a cylindrical shape, and a notch 41 is formed at two locations on one end. The cutout 41 is cut out in a rectangular shape along the longitudinal direction from the edge of the heat transfer cylinder 4 on the cover 8 side. The width of the notch 41 is formed to be substantially the same as the thickness of the heat transfer plate 5 to be engaged. The heat transfer cylinder 4 houses the power supply circuit 6 and forms a part of a housing portion that secures a space for housing the power supply circuit 6.

  FIG. 6 is a schematic enlarged view of the heat transfer plate 5 in the present embodiment. The heat transfer plate 5 is connected to a rectangular plate-like connection plate portion 51 having a rectangular connection surface 51 a that is a connection portion that is thermally connected to the power supply circuit 6, and to both ends on the long side of the connection plate portion 51. And two fins 52 extending in a direction separated from each other in a direction parallel to the connection plate portion 51. The two fins 52 have a shape that extends from the base 7 side to the cover 8 side along the outer shape of the heat radiating unit 3 that is the outer shell of the lighting device 100. In other words, the two fins 52 have a trapezoidal shape that becomes wider from the base 7 side in the longitudinal direction toward the cover 8 side. As shown in FIGS. 5 and 6, slits 53 are formed in the fin 52 over an appropriate length from the end on the base 7 side along the longitudinal direction. The width of the slit 53 is substantially the same as the thickness of the heat transfer cylinder 4 to be engaged.

  The heat transfer plate 5 is integrated with the heat transfer tube 4 by being aligned with the slit 53 and the notch 41 of the heat transfer tube 4 so that the heat transfer plate 5 is inserted into the heat transfer tube 4 along the longitudinal direction. Thermally connected. In this integrated state, as shown in FIG. 3, most of the fins 52 of the heat transfer plate 5 protrude from the outer surface 4a of the heat transfer tube 4 in the radial direction of the heat transfer tube 4, that is, It corresponds to a protruding portion protruding from the outer surface of the cylindrical portion of the heat conducting portion. Since the notch 41 of the heat transfer tube 4 and the slit 53 of the heat transfer plate 5 are substantially the same as the thickness of the heat transfer plate 5 and the heat transfer tube 4 to be engaged, the heat transfer plate 5 and the heat transfer tube 4 are the same. Is thermally connected over substantially the entire length of the fins 52 of the heat transfer plate 5 in the longitudinal direction.

  Therefore, the heat conducted from the power supply circuit 6 to the heat transfer plate 5 is favorably conducted from the heat transfer plate 5 to the heat transfer cylinder 4. The diameter of the heat transfer tube 4 and the shape of the connection plate portion 51 of the heat transfer plate 5 are appropriately determined so that the inner surface 4b of the heat transfer tube 4 and the power supply circuit 6 approach each other. The heat transfer cylinder 4 and the fins 52 described above are conductive parts that conduct heat from the power supply circuit 6 to the heat radiating part 3. Further, the fin 52 is a part of a heat conducting portion embedded in the heat radiating portion 3 as described later, and is a protruding portion protruding from the outer surface of the cylindrical portion as described above.

  The power supply circuit 6 includes a power supply circuit board 61 having a rectangular plate shape and a plurality of power supply circuit components 62 mounted on the power supply circuit board 61. The power circuit component 62 is connected to a bridge diode for full-wave rectification of an alternating current supplied from an external alternating current power source, a transformer for transforming the rectified power supply voltage to a predetermined voltage, and a primary side and a secondary side of the transformer. A diode, an IC, and the like are provided. A rectangular plate-shaped heat conduction sheet 60 is interposed between the power supply circuit board 61 and the connection plate portion 51 of the heat transfer plate 5. The power supply circuit 6 and the heat transfer plate 5 are thermally connected via the heat conductive sheet 60, and heat from the power supply circuit 6 is indirectly conducted to the heat transfer plate 5. The size and arrangement of the heat conductive sheet 60 are appropriately determined according to the arrangement of the power supply circuit components 62. As this heat conductive sheet 60, a heat good conductor having electrical insulation is used, for example, a low-hardness flame-retardant silicone rubber is used. The heat conductive sheet 60 is not essential and may be a heat conductive grease, and the power circuit board 61 and the heat transfer plate 5 are thermally connected while being electrically insulated, and can conduct heat well. What is necessary is just to be comprised.

  A base 7 is provided on one end side of the heat radiating portion 3. The base 7 has a cylindrical shape with a bottom, a one-pole terminal 71 having a cylindrical portion that is threaded to be screwed into a socket for a light bulb, and a projection that protrudes from the bottom surface of the base 7 The electrode terminal 72 is provided. These one-pole terminals 71 and other-pole terminals 72 are electrically insulated. The outer shape of the cylindrical portion of the base 7 is formed in the same shape as the screw-type base of E17 or E26, for example. In the base 7, the other end side opposite to the notch 41 of the heat transfer cylinder 4 is fitted.

  A method for forming the heat radiating part 3 will be described below. 7 and 8 are explanatory views of the molding of the heat radiation part 3 in the present embodiment. First, the heat transfer plate 5 is inserted into the heat transfer tube 4 so as to be engaged with each other at the notch 41 of the heat transfer tube 4 and the slit 53 of the heat transfer plate 5, and the heat transfer plate 5 is engaged by the heat transfer tube 4. Hold together. Next, the heat transfer tube 4 is fitted into the base 7 so that the other end side opposite to the notch 41 of the heat transfer tube 4 is located inside the base 7 (see FIG. 7). While holding the heat transfer cylinder 4, the heat transfer plate 5, and the base 7, a mold corresponding to the shape of the heat radiating portion 3 shown by a two-dot chain line in FIG. 7 is fitted. Then, the above-described heat-dissipating resin in a molten state is poured into the mold using an injection molding machine or the like to solidify the heat-dissipating resin. The projecting portion of the heat radiation resin radiates heat so as to cover both the outer surface 4a of the heat transfer tube 4 that houses the power supply circuit 6 and the outer surface 4a of the fin 52 that protrudes from the outer surface 4a of the heat transfer tube 4. It is provided so as to be embedded in the portion 3 and so as to be embedded between the inner surface of the base 7 and the outer surface 4 a of the heat transfer cylinder 4. FIG. 8 shows a completed state in which the heat radiating portion 3 is integrally formed with the heat transfer cylinder 4, the heat transfer plate 5, and the base 7 after the heat radiating resin is solidified.

  As described above, the heat transfer cylinder 4, the heat transfer plate 5, and the base 7 are integrally formed of the heat radiating resin (heat radiating part 3), and the heat radiating part 3 includes the heat transfer cylinder 4 and the heat transfer plate 5. It functions also as a connection body which connects the heat conducting part and the base 7. And since the molten heat radiation resin is poured and solidified, and the heat radiating part 3, the heat transfer cylinder 4, the heat transfer plate 5 and the base 7 are integrally formed, the heat radiation part 3 and the outer surface 4a of the heat transfer cylinder 4 and The fins 52 can be brought into close contact with each other without causing a gap, an increase in thermal resistance due to the presence of air or the like can be suppressed, and heat conduction from the heat transfer cylinder 4 and the heat transfer plate 5 to the heat radiating unit 3 can be suppressed. It can be done well.

  Moreover, as a heat conduction part, it is made into the shape which can accommodate the power supply circuit 6 inside like the heat transfer cylinder 4, and it shape | molds integrally with the thermal radiation part 3 by injection molding, ensuring the space which accommodates the power supply circuit 6 here. It becomes possible to do. Furthermore, the heat conduction part is connected to the connection plate 51a having a connection surface 51a that is thermally connected to the power supply circuit 6 that is a heating element, and the heat from the power supply circuit 6 is thermally connected to the connection plate 51. By comprising the fins 52 and the heat transfer cylinders 4 which are conductive parts that conduct heat to the heat radiating part 3, a wide heat transfer area can be secured and the thermal resistance of the heat conductive part is reduced. Can be dissipated in the heat conduction part, and the temperature rise of the heating element and the heat conduction part can be reduced. Further, since the heat transfer area between the heat conducting part and the heat radiating part can be widened, the amount of heat conducted per unit time increases, and heat can be conducted from the heat conducting part to the heat radiating part 3 satisfactorily.

  Furthermore, the shape of the two fins 52 is formed integrally with the heat radiating part 3 by forming a trapezoidal shape that widens along the outer shape of the heat radiating part 3 from the base 7 side toward the cover 8 side. It is possible to secure a wide area for close contact. Accordingly, by adopting a shape like the fin 52, a wide heat transfer area can be secured, and heat from the power supply circuit 6 can be efficiently conducted to the heat radiating portion 3 through both surfaces of the two fins 52. .

  The power supply circuit 6 accommodated in the heat transfer cylinder 4 is electrically connected to the one-pole terminal 71 and the other-pole terminal 72 of the base 7 via electric wires 76 and 77. As shown in FIG. 5, the one-pole terminal 71 of the base 7 and the power supply circuit 6 electrically connect the power supply circuit 6 and the heat transfer cylinder 4, which is an aluminum conductor, by an electric wire 76. The cylinder 4 and the one-pole terminal 71 of the base 7 are connected by being electrically connected by solder (not shown). Compared with the case where the power supply circuit 6 and the one-pole terminal 71 of the base 7 are connected only by an electric wire, the length of the electric wire can be shortened, and the side of the surface 3a on the other end side of the heat radiating part 3 Since it is easy to connect the electric wires 76, the workability is improved in the manufacturing process. The power supply circuit 6 is electrically connected to the LED 12 via a connector via an electric wire (not shown).

  On the other hand, a light transmissive cover 8 is attached to the heat radiating plate 2 on the other end side of the heat radiating portion 3 so as to cover the light emitting direction side of the LED 12. The cover 8 is made of milky white glass having a hemispherical shell shape. It is desirable that an anti-scattering film for preventing debris from scattering when the cover 8 is broken is provided on the inner surface of the cover 8 over substantially the entire surface. The cover 8 is attached to the edge of the heat sink 2 with an adhesive or the like at the periphery on the opening side. The material of the cover 8 is not limited to glass, and may be made of a resin such as polycarbonate.

  The illumination device 100 configured as described above is connected to an external AC power source by screwing the base 7 into a socket for a light bulb. When the power is turned on in this state, an alternating current is supplied to the power supply circuit 6 through the base 7. The power supply circuit 6 supplies power with a predetermined voltage and current to the LED 12 to light the LED 12.

  As the LED 12 is turned on, the LED 12 and the power supply circuit component 62 of the power supply circuit 6 mainly generate heat. As described above, the heat from the LED 12 is conducted to the heat radiating plate 2 and the heat radiating portion 3, and is radiated from the heat radiating plate 2 and the heat radiating portion 3 to the air outside the lighting device 100. On the other hand, heat from the power supply circuit component 62 of the power supply circuit 6 is conducted to the heat transfer plate 5, and part of the conducted heat is conducted from the heat transfer plate 5 to the heat transfer cylinder 4. The heat conducted to the heat transfer plate 5 and the heat transfer cylinder 4 is conducted to the heat radiating section 3 provided in close contact with the heat transfer cylinder 4 and the fins 52, and is radiated from the heat radiating section 3 to the air outside the lighting device 100. Is done.

  In the illumination device 100 according to the present embodiment, as described above, the heat radiating section 3, the heat transfer cylinder 4, and the heat transfer plate 5 are integrally formed. The outer surface 4a and the fins 52 and the heat radiating part 3 which is a heat radiating part can be brought into close contact with each other, the heat conduction from the heat transfer cylinder 4 and the heat transfer plate 5 to the heat radiating part 3 can be performed satisfactorily, the power circuit 6 and the like It is possible to sufficiently dissipate heat from the heating element.

  The heat dissipating part 3 is configured so that the projecting part covers the outer surface 4a of the heat transfer cylinder 4 that accommodates the power supply circuit 6 and the outer surface 4a of the heat transfer cylinder 4 of the fin 52. Since it is provided so as to be embedded in 3, it is possible to increase a heat transfer area with good heat conduction in a close contact state. Further, since the fin 52 has a trapezoidal shape along the shape of the heat radiating part 3, a wide heat transfer area with the heat radiating part 3 can be secured, and heat is efficiently conducted to the heat radiating part 3. Therefore, heat conduction from the heat transfer cylinder 4 and the heat transfer plate 5 to the heat radiating portion 3 can be performed more satisfactorily, and the heat from the heating element such as the power supply circuit 6 can be sufficiently radiated.

  Further, the diameter of the heat transfer cylinder 4 and the shape of the heat transfer plate 5 are appropriately determined so that the inner surface 4b of the heat transfer cylinder 4 and the power supply circuit 6 are as close as possible. Therefore, since the power supply circuit 6 and the heat radiating part 3 are brought close to each other, the heat from the power supply circuit 6 is conducted to the opposing surface of the heat radiating part 3 and the heat radiating efficiency from the heat radiating part 3 can be improved.

  And since the thermal radiation part 3 is made from resin, compared with the case where metals, such as aluminum, are used, the thermal radiation part 3, and by extension, the illuminating device 100 can be reduced in weight. Generally, the heat dissipation resin has a lower thermal conductivity than the metal, but as described above, the heat dissipating section 3, the heat transfer cylinder 4, and the heat transfer plate 5 are integrally formed to form the outer surface 4a of the heat transfer cylinder 4 and Since the fins 52 and the heat radiating part 3 are in close contact with each other, the lighting device 100 is reduced in weight, and the heat from the heating element such as the power supply circuit 6 is sufficiently radiated. Accordingly, it is possible to cool the power supply circuit component 62 and the like of the power supply circuit 6 to a temperature necessary for ensuring a predetermined performance.

  Moreover, since the heat radiating part 3, the heat transfer cylinder 4, the heat transfer plate 5, and the base 7 are integrally formed, in other words, the heat radiating part 3 is functioned as a connecting body, so that fastening parts such as screws are unnecessary. Thus, the structure can be simplified, the manufacturing process can be simplified, and the cost can be reduced. Since the heat dissipating part 3 is made of resin, an integrally molded product including the heat dissipating part 3 and the heat dissipating part 3 can be easily processed by injection molding or the like. In particular, compared with the case where the heat radiating part 3 is made of aluminum die casting, the energy required for processing the heat radiating part at the time of manufacture can be greatly reduced, which contributes to energy saving.

  Furthermore, the heat radiating part 3 is made of an electrically insulating material. When a conductor is used for the heat dissipating part 3, it is necessary to insulate between the heat dissipating part 3 and a base connected to an external power source through an electric insulator member in order to prevent electric shock. Since it is manufactured, an electrical insulator member is not required, and the number of parts can be reduced to reduce the weight and size.

  In particular, in a light bulb-type lighting device, a socket for attaching an existing incandescent light bulb or the like may be thin according to the shape of the incandescent light bulb. When an electrical insulator member is provided on a light bulb having a heat dissipation part made of a conductor, the peripheral edge of the base becomes thicker due to the electrical insulator member between the base and the heat dissipation part. There is a possibility that it cannot be installed. In the lighting device 100 according to the present embodiment, since the heat dissipating part 3 is made of an electrically insulating material, an electric insulator member is not required, and therefore, the portion that fits into the socket can be thinned and molded. Can be installed in existing sockets for light bulbs.

  In addition, in the above embodiment, although the heat transfer cylinder 4 and the heat transfer plate 5 which are heat conduction parts are provided separately, they may be integrally formed. Further, only one of the heat transfer cylinder 4 and the heat transfer plate 5 may be used.

  Moreover, in the above embodiment, the heat transfer cylinder 4, the heat transfer plate 5, and the base 7, which are heat conduction parts, are integrally molded using the mold by the heat dissipation part 3. You may manufacture by the method of thermally connecting a thermal conduction part to the thermal radiation part 3, after shape | molding previously in single. At that time, the heat radiating part 3 is molded so as to have a shape that allows the heat conducting part to be thermally connected to the heat radiating part after molding. For example, specifically, by forming the heat conduction portion in which the heat transfer cylinder 4 and the heat transfer plate 5 in Embodiment 1 are engaged and forming a heat radiation portion having a cavity that can be inscribed therein, Later, the heat conducting portion and the heat radiating portion can be thermally connected. Moreover, you may fix the nozzle | cap | die 7 with the screw | thread etc. to the heat-radiation part 3 after shaping | molding.

(Embodiment 2)
FIG. 9 is a schematic cross-sectional view of lighting apparatus 200 according to Embodiment 2 of the present invention. FIG. 10 is a schematic longitudinal sectional view of the illumination device 200 according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Inside the heat dissipating part 9, a heat transfer cylinder 10 is embedded as a heat conducting part that conducts heat from a heating element such as the LED 12 and the power supply circuit 6 to the heat dissipating part 9. The heat transfer cylinder 10 is a good heat conductor, and is made of a metal such as aluminum, for example.

  The shape of the heat transfer cylinder 10 is a square cylinder that can accommodate the power supply circuit 6 therein. The heat transfer cylinder 10 includes a connection portion 10 a having a surface that is thermally connected to the power supply circuit 6 among the four surfaces constituting the heat transfer cylinder 10 inside the heat transfer cylinder 10, and a connection portion that transfers heat from the power supply circuit 6. And a conductive portion 10b that conducts heat to the heat radiating portion 9. The conductive portion 10b is made of a member having two surfaces connected to both ends of the connecting portion 10a and a surface facing the connecting portion 10a.

  As shown in FIGS. 9 and 10, the power supply circuit 6 includes a power supply circuit board 61 on which the power supply circuit component 62 is mounted and a surface on the inner side of the heat transfer cylinder 10 in the connection portion 10 a via a heat conductive sheet 60. Thermally connected.

  A method for forming the heat radiating portion 9 will be described. First, the heat transfer cylinder 10 is fitted into the base 7 so that the peripheral edge of one end in the longitudinal direction of the heat transfer cylinder 10 is located inside the base 7 (see FIG. 10). Note that the width and thickness of the connecting portion 10a and the conductive portion 10b constituting the heat transfer tube 10 are such that one end in the longitudinal direction of the heat transfer tube 10 can be fitted in the base 7 and the power supply circuit 6 is placed inside the heat transfer tube 10. Any dimensions that can be accommodated and thermally connected to the connecting portion 10a are acceptable. Next, the heat transfer cylinder 10 is fitted into a mold corresponding to the shape of the heat radiating portion 9 while maintaining the state in which the heat transfer cylinder 10 is fitted in the base 7. Then, the above-described heat-dissipating resin in a molten state is poured into the mold using an injection molding machine or the like to solidify the heat-dissipating resin.

  The heat radiating resin is embedded in the heat radiating section 9 so as to cover the outer surface 10c of the heat transfer cylinder 10 and so as to fill between the inner surface of the base 7 and the outer surface 10c of the heat transfer cylinder 10. Pour into the mold and mold the heat dissipating part 9. FIG. 10 shows a longitudinal sectional view of a state in which the heat radiating portion 9 is integrally formed with the heat transfer cylinder 10 and the base 7 after the heat radiating resin is solidified.

  The heat transfer plate 10 according to the first embodiment is configured such that the heat transfer tube 10 that is a heat transfer unit has a shape such as a square tube that can directly connect the power supply circuit 6 inside the heat transfer unit. 5 can be reduced, and the structure of the heat conduction part can be simplified. In addition, the heat conduction part is thermally connected to the power supply circuit 6 like the connection part 10a, and the heat dissipation part 9 and the outer surface 10c are in direct contact with each other, so that the power supply circuit 6 that is a heating element and the heat dissipation part Therefore, the thermal resistance between the power supply circuit 6 and the heat radiating portion 9 can be reduced, and heat can be conducted between a short distance. As a result, heat from the power supply circuit 6 is quickly conducted to the heat radiating portion 9, and heat can be efficiently radiated from the heat radiating portion 9.

  In the second embodiment, the heat generated from the power supply circuit 6 is conducted to the connecting portion 10a through the heat conductive sheet 60, and then conducted from the connecting portion 10a to the heat radiating portion 9, or from the connecting portion 10a to the conducting portion 10b. Then, the heat is conducted from the conductive portion 10b to the heat radiating portion 9 and is radiated from the heat radiating portion 9 to the outside air. By providing the conduction part 10b, the thermal resistance of the heat conduction part is reduced, and the heat conducted from the power supply circuit 6 to the connection part 10a is diffused to the conduction part 10b, and the temperature rise of the power supply circuit 6 can be suppressed. .

  The shape of the heat transfer cylinder 10 does not have to be a square cylinder, has a surface that can be thermally connected to the power supply circuit 6 like the connection portion 10a, and is thermally connected to the heat dissipation portion 9 on the outer surface. It only needs to have a shape that is possible. For example, a pentagonal tube may be used, or the shape may be such that the inner surface of the cylinder is partially thermally connected to the power supply circuit 6 as a substantially planar connection portion, and the arc portion other than the connection portion is a conductive portion. Furthermore, it is good also as a structure which provides the protrusion part like the fin 52 in Embodiment 1 on the outer surface of the heat transfer cylinder 10, and expands the heat transfer area of a heat conduction part.

  Similarly to the first embodiment, the manufacturing method may be a method in which the heat radiating portion 9 is formed in advance as a single unit and then the heat conducting portion is thermally connected to the heat radiating portion 9. At that time, the heat radiating part 9 is molded so as to have a shape capable of thermally connecting the heat conducting part to the heat radiating part after molding. For example, specifically, by forming the heat dissipating part having the cavity that can be inscribed by inserting the heat transfer tube 10 in the second embodiment, the heat conducting part and the heat dissipating part can be thermally connected after forming. It becomes. Or you may shape | mold by the method of inserting | pinching and fixing a heat-transfer cylinder with a pair of heat-radiation part shape | molded previously. Moreover, you may fix the nozzle | cap | die 7 with the screw | thread etc. to the thermal radiation part 9 after shaping | molding.

  Furthermore, in the embodiment of the lighting device according to the present invention, when the heat radiating portion is previously formed as a single unit, the heat transfer cylinder 4, the heat transfer plate 5, and the heat transfer cylinder 10 as in the first and second embodiments. Is used as a heat conducting part, and a heat conducting member having a good thermal conductivity and flexibility such as the heat conducting sheet 60 is used as the heat conducting part, and the power supply circuit is thermally connected to the heat radiating part through the heat conducting part. May be. In that case, it is possible to reduce the weight by reducing the number of parts, but it is desirable to devise such as forming the thickness of the heat dissipation portion relatively thin in order to improve the heat dissipation.

  Moreover, in the above embodiment, although the thermal radiation part 3 and the thermal radiation part 9 are made from resin, the thermal radiation part should just be made from the material which has electrical insulation. For example, it may be made of ceramic. In the above embodiment, only the heat radiating part 3 and the heat radiating part 9 are made of resin. However, the heat radiating plate 2 is made of resin, and similarly to the heat radiating part 3 and the heat radiating part 9, the light source module 1 and the heat radiating plate. You may comprise so that 2 may be shape | molded integrally.

  In the embodiment of the lighting device according to the present invention, in order to improve the heat radiation efficiency from the heat radiating portion, it is desirable that a heat radiation film having good heat radiation is formed on the outer surface of the heat radiating portion. The heat radiation film is provided on, for example, a first ceramic film provided on the outer surface of the heat radiating portion and a surface of the first ceramic film, and the first ceramic film has a wavelength distribution of infrared emissivity different from that of the first ceramic film. 2 ceramic membranes.

  The first ceramic film is formed by applying a coating containing a heat-radiating material having a high infrared emissivity (emissivity in the wavelength region of infrared rays) to the outer surface of the heat radiating portion and then curing the coating. For example, aluminum oxide is used as the thermal radiation material contained in the coating material of the first ceramic film. Note that a metal oxide such as titanium oxide or silicon dioxide, carbon black, or the like may be used as the thermal radiation material used for the first ceramic film. The thickness of the first ceramic film is appropriately set according to the temperature of the heating element.

  In the second ceramic film, a coating material containing a thermal radiation material having a thermal emissivity different from that of aluminum oxide used as the thermal radiation material of the first ceramic film is applied to the surface of the first ceramic film. It is cured afterwards. For example, titanium oxide, which is a metallic oxide, is used as the heat-radiating material contained in the second ceramic film paint. The thermal radiation material used for the second ceramic film is not limited to titanium oxide, and the thermal radiation material having a thermal emissivity different from that of aluminum oxide used as the thermal radiation material of the first ceramic film. Any metal oxide or carbon black having a thermal emissivity different from that of aluminum oxide may be used.

  Note that the first ceramic film and the second ceramic film are preferably cured by being applied at a temperature of about 110 ° C. after being applied. By sintering, the heat radiation film can be fixed to the main body of the heat radiating portion to increase the coating strength, and the molecular bond of the heat radiation film becomes dense, so that the heat radiation efficiency by radiation can be enhanced.

  By forming the heat radiation film on the surface of the heat radiating part in this way, it becomes easy to radiate infrared rays in the heat radiation film. Therefore, in addition to heat transfer by convection from the heat radiating part, by heat radiation from the surface of the heat radiating part. Heat transfer can be performed efficiently, and the heat conducted from the LED and the heating element of the power supply circuit can be efficiently radiated to the outside.

  Moreover, in the above embodiment, although the power supply circuit 6 was described as a heat generating body accommodated in the heat transfer cylinder 4 or the heat transfer cylinder 10, it is comprised so that the light quantity and / or chromaticity of LED can be adjusted. In the illumination device with a dimming function, the dimming control unit also becomes a heating element. Even in this case, the configuration is the same as that of the power supply circuit 6 described in the above embodiment, that is, the control circuit board is installed on the connection plate portion 51 of the heat transfer plate or the connection portion 10a of the heat transfer cylinder 10 to control the control circuit board. It is possible to efficiently conduct heat from the part to the heat radiating part 3.

  Further, in the above embodiment, the surface mount type LED is used as the light source. However, the present invention is not limited to this, and other types of LEDs, EL (Electro Luminescence), and the like may be used.

  In the above embodiment, the light bulb type lighting device attached to the socket for the light bulb has been described as an example. However, the present invention is not limited to the light bulb type lighting device, but other types of lighting devices, for example, downlights. Can be applied. When applied to a downlight, a base is not required, and the heat conducting portion and the heat radiating portion are formed integrally. Furthermore, the present invention can be applied to a device including a heating element other than the lighting device, and can be implemented in various modifications within the scope of the matters described in the claims. Needless to say.

12 LED (light source)
3 Heat radiation part 4 Heat transfer cylinder (heat conduction part, cylinder part)
5 Heat transfer plate (heat conduction part)
51 Connection plate (connection)
52 Fin (projecting part)
6 Power supply circuit 7 Base 9 Heat radiation part 10 Heat transfer cylinder (heat conduction part, cylinder part)
10a connection part 10b conduction part

Claims (4)

A light source;
A power supply circuit for supplying power to the light source;
A heat dissipating part that is made of an electrically insulating material and dissipates heat from the power supply circuit housed inside to the outside air,
A heat conducting portion for conducting heat from the power supply circuit to the heat radiating portion;
A lighting device having a base provided at one end of the heat dissipation part,
The heat dissipating part has a thick frustoconical outer shape whose diameter is expanded from the one end to the other end, and at least a part of the heat conducting part is embedded to be thermally connected to the heat conducting part. A lighting device characterized by being connected. The heat conduction part has a connection part that is thermally connected to the power supply circuit, and a fin that conducts heat from the power supply circuit to the heat dissipation part,
The heat dissipating part has the fin embedded therein,
The lighting device according to claim 1, wherein the fin has a shape that becomes wider from the one end to the other end. The heat conducting part has a cylindrical part that houses the power supply circuit inside,
The lighting device according to claim 2, wherein the fin has a slit that engages with the cylindrical portion on the one end side.   The lighting device according to claim 1, wherein the light source is an LED and has a light bulb shape.

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