JP2012038744A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device in which disconnection or the like of a wire in a drive circuit part and breakage of components during falling of the illumination device can be prevented.SOLUTION: In the illumination device including: a light source module 1 having an LED as a light source; a metallic heat dissipating part 2 on which the light source module 1 is mounted and which dissipates heat from the light source module 1; and a base 4 which is installed on one side of the heat dissipating part 2 via a cylindrical insulation case 3 composed of resin, a metal case 6 is installed in the interior of the insulation case 3 as a reinforcing member. A power supply circuit part 7 to drive the light source module 1 is housed in a cavity formed by the heat dissipating part 2 and the metal case 6.

Description

  The present invention relates to a light bulb-type lighting device that uses an LED as a light source and has a base.

  A conventional incandescent lamp has a base having a bottomed cylindrical shape, and the base is a one-pole terminal formed by screwing a cylindrical portion to be screwed with a socket for a light bulb connected to an external power source. And another pole terminal projecting from the bottom of the base. The one-pole terminal and the other-pole terminal of the base are electrically connected to a drive circuit unit that drives the light source via an electric wire or the like.

  The fluorescent lamp device disclosed in Patent Document 1 includes a base 502, a case 503 attached to the base 502 and opening in a trumpet shape, a lighting circuit (drive circuit unit) 504 housed in the case 503, and the lighting circuit An apparatus main body 501 having a fluorescent lamp 509 electrically connected to the apparatus 504 and a globe 510 connected to the apparatus main body 501 and surrounding the fluorescent lamp 509 are provided (see FIG. 6). In this fluorescent lamp device, the circuit board 505 on which the lighting circuit 504 is mounted, the space surrounded by the case 503, and the cavity inside the base 502 are filled with the resin molding material 506.

JP-A-57-50762

  However, when the resin mold material 506 is filled so as to cover the circuit components constituting the lighting circuit 504 mounted on the circuit board 505 as in the fluorescent lamp device described in Patent Document 1, the gap between the resin and the circuit components is Therefore, when the resin cools and hardens, the stress acts on the circuit component, the electric wire connected to the circuit component, etc. There is a risk of disconnection of the electric wire connected to the circuit component. In view of the above problem, when the resin mold material is removed from the space surrounded by the circuit board 505 on which the lighting circuit 504 is mounted and the case 503 and the cavity inside the base 502, the base deforms when the lighting device is dropped. As a result, problems have arisen such that it becomes impossible to screw into the socket for the light bulb, or the electric wire or the like inside the base is disconnected, so that power from the external power source cannot be supplied to the drive circuit unit.

  The present invention has been made in view of such circumstances, and provides an illuminating device that can prevent breakage of components when the illuminating device is dropped while preventing breakage of electric wires in the drive circuit unit. Objective.

  An illumination device according to the present invention includes a light source made of an LED, a metal main body portion to which the light source is attached and dissipates heat from the light source, and a cylindrical insulator made of resin on one end side of the main body portion. A reinforcing member provided inside the insulator, and a drive circuit unit for driving the light source is accommodated in a cavity formed by the main body unit and the reinforcing member. It is characterized by being.

  In the present invention, a light source composed of LEDs is attached to a metal main body having a heat dissipation function, and the main body is connected to a base via a resin insulator. Since the reinforcing member is provided, for example, even if the lighting device is accidentally dropped, the deformation of the base can be reduced, and the electric wire connected to the base can be prevented from being disconnected. Further, since the drive circuit unit is accommodated in the cavity formed by the main body unit and the reinforcing member, a gas layer such as air exists around the circuit component of the drive circuit unit, and the circuit component is damaged due to thermal stress. It is possible to prevent disconnection of the electric wire connected to the.

  The lighting device according to the present invention is characterized in that the reinforcing member is a metal case.

  In the present invention, since a high-strength metal case is used as the reinforcing member, it is possible to more reliably prevent the parts from being damaged when dropped.

  In the lighting device according to the present invention, the reinforcing member has a bottomed cylindrical shape, has a hole through which a wire connecting the drive circuit portion and the base is inserted, and a position corresponding to the hole of the wire. A protective tube is put on.

  In the present invention, since the electric wire connected to the base is covered with a protective tube and inserted into the hole provided in the bottom of the bottomed cylindrical reinforcing member, the electric wire does not directly contact the peripheral edge of the hole, Can be protected from damage.

  The illuminating device according to the present invention is characterized in that a holding portion for holding the reinforcing member protrudes from the inner surface of the insulator.

  In the present invention, since the holding portion for holding the reinforcing member is projected on the inner surface of the insulator, the function of the heat insulating material is provided between the insulator and the reinforcing member by appropriately providing the holding portion. A gas layer such as air can be interposed. As a result, when the circuit components of the drive circuit section generate heat, it becomes difficult for heat to be transmitted from the reinforcing member to the insulator, and it is possible to reliably prevent the temperature of the insulator from rising and causing smoke or fire. .

  In the lighting device according to the present invention, the drive circuit unit includes a substrate on which the circuit component is mounted, and the insulator and the reinforcing member are provided with engagement recesses for engaging a part of the substrate, respectively. It is characterized by being.

In the present invention, the substrate on which the circuit component is mounted is engaged with the engaging recess provided in the insulator and the reinforcing member, and the reinforcing member is held so as not to move between the insulator and the substrate. It becomes possible. The user does not feel uncomfortable when the lighting device is moved.
Furthermore, the lighting device according to the present invention is a PAR type lighting device.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing the disconnection etc. of the electric wire in a drive circuit part, damage to the components at the time of dropping of an illuminating device can be prevented.

It is a typical external appearance perspective view of the illuminating device which concerns on embodiment of this invention. It is a typical exploded perspective view of the illuminating device which concerns on this Embodiment. It is a typical longitudinal cross-sectional view of the principal part of the illuminating device which concerns on this Embodiment. It is a top view of the principal part of this invention containing the insulation case and base of the illuminating device which concerns on this Embodiment. It is typical sectional drawing by the VV line of FIG. It is a fragmentary sectional view of the illuminating device concerning a prior art.

  Hereinafter, based on the drawings showing the embodiments of the present invention, a so-called PAR (Parabolic Aluminized Reflector) type lighting device having a parabolic curved outer shape, which is a kind of light bulb type lighting device, will be described in detail. Describe. FIG. 1 is a schematic external perspective view of a lighting apparatus according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the lighting apparatus according to the present embodiment. FIG. 3 is a schematic longitudinal sectional view of a main part of the lighting apparatus according to the present embodiment.

  In the figure, reference numeral 1 denotes a light source module as a light source. As shown in FIG. 3, the light source module 1 includes a plurality of light emitting diodes (hereinafter referred to as LEDs) 12 mounted on one surface of a disk-shaped LED substrate 11. The LED 12 is, for example, a surface mount type LED. In the present embodiment, five LEDs 12 are provided on the peripheral portion of one surface of the LED substrate 11 in a substantially equal manner in the circumferential direction, and the angle is set substantially concentrically inside the annular LED 12. Differently, five LEDs 12 are provided in a substantially equal distribution in the circumferential direction. In addition, in FIG. 2, description of LED is abbreviate | omitted.

  On one surface of the LED substrate 11 (the surface on which the LEDs 12 are mounted), a reflective sheet 10 having the same diameter as that of the LED substrate 11 is attached. The reflective sheet 10 is provided with a rectangular hole that is slightly larger than the planar shape of the LED 12 in alignment with the arrangement of the LEDs 12. The reflection sheet 10 is made of a material having a high light reflectance, and is, for example, a polyethylene terephthalate (PET) film. Thereby, since the light radiate | emitted from LED12 is reflected in the reflective surface of the reflection sheet 10 without being absorbed by the LED board 11, the fall of the light quantity radiate | emitted from the light source module 1 to the exterior can be prevented.

  The light source module 1 is attached to a heat radiating section 2 as a main body section that dissipates heat from the light source module 1 and houses a drive circuit section that drives the light source module 1. The heat radiation part 2 is made of metal such as aluminum, for example. The heat radiating unit 2 has a disk shape and includes a light source holding unit 21 that holds the light source module 1. The light source module 1 is attached to the one surface 21a of the light source holding portion 21 on the other surface of the LED substrate 11 (the surface opposite to the surface on which the LEDs 12 are mounted). In addition, it is more desirable to interpose a heat conductive sheet or grease between the light source module 1 and the light source holding part 21. The light source holding unit 21 also functions as a heat transfer unit that transfers heat from the LED 12 to other parts of the heat dissipation unit 2.

  On the other surface 21 b of the light source holding part 21, a cylindrical heat radiating cylinder 22 that is concentric with the light source holding part 21 is provided upright. The end of the heat radiating cylinder 22 is a plane parallel to the one surface 21 a of the light source holding part 21, and an annular groove 22 c concentric with the heat radiating cylinder 22 is provided at the end. An annular sealing material 30 is fitted in the groove 22c. The sealing material 30 is provided with fixing portions having screw holes at three locations in the circumferential direction.

  On one surface 21 a of the light source holding part 21, a flat cylindrical reflecting part 23 concentric with the light source holding part 21 is erected. The inner surface 23a of the reflecting portion 23 is more preferably mirror-finished. By applying the mirror finish, the light emitted from the LED 12 and incident on the inner surface 23a of the reflecting portion 23 is reflected by the inner surface 23a and emitted in a direction along the light emitting direction of the LED 12, and the entire illumination device As a result, the so-called device efficiency can be improved.

  A mounting surface 23b to which a light transmitting plate, which will be described later, is mounted is formed on the inner edge portion of the end portion of the reflecting portion 23. The mounting surface 23b is provided with an annular groove 23c. An annular packing 20 is fitted in the groove 23c. The packing 20 allows the heat radiating unit 2 and the translucent plate to be in close contact with each other, so that foreign matters such as water droplets can be prevented from entering the cavity formed by the reflective unit 23 and the translucent unit. The light source module 1 described above is accommodated in a cavity formed by the reflecting portion 23 of the heat radiating portion 2 and the translucent plate.

  The heat radiating tube 22 and the reflecting portion 23 are formed so that the outer peripheral surface is a smooth curved surface whose diameter is expanded from the heat radiating tube 22 toward the reflecting portion 23. On the outer peripheral surfaces of the heat radiating tube 22 and the reflecting portion 23, a plurality of fins 24 of ridges projecting radially outward along the longitudinal direction are substantially equally arranged in the circumferential direction, and the heat radiating portion 2 is substantially omitted. It is provided over the entire length.

  A rectangular plate-shaped heat transfer plate 25 is provided on the inner side of the heat radiating tube 22 on the other surface 21b of the light source holding portion 21 to transmit heat from a power supply circuit portion to be described later to other portions of the heat radiating portion 2. . In addition, a clamping part (not shown) that clamps a power supply board of a power supply circuit unit, which will be described later, is provided inside the heat radiating cylinder 22 so as to be separated from the heat transfer plate 25 by an appropriate length and in parallel with the heat transfer plate 25. It is. In addition, the heat radiating part 2 is formed integrally with the light source holding part 21, the heat radiating cylinder 22, the reflecting part 23, the fins 24, and the heat transfer plate 25, and has a function as a holding body for holding the light source, and illumination. It functions as an exterior body of the device.

  Power from an external power source is supplied to the light source module 1 that is a light source through the cylindrical insulating case 3 that is an insulator on the side of the heat radiating cylinder 22 of the heat radiating unit 2 (one end side of the heat radiating unit 2). A base 4 is provided. The base 4 is provided in the heat radiating part 2 as the main body part via an insulating case 3 as an insulator. FIG. 4 is a plan view of the main part of the present invention including the insulating case 3 and the base 4 of the lighting device according to the present embodiment. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG.

  The insulating case 3 includes a cylindrical heat radiating part holding cylinder 31 that holds the heat radiating part 2, a cylindrical base holding cylinder 32 that holds the base 4, and a connecting part that connects the heat radiating part holding cylinder 31 and the base holding cylinder 32. 33. The heat radiating part holding cylinder 31, the base holding cylinder 32, and the connecting part 33 are made of, for example, an electrically insulating material such as resin and are integrally formed.

  The heat radiating part holding cylinder 31 has an annular projecting part fitted into the heat radiating cylinder 22 of the heat radiating part 2 and a contact surface 34a that is provided around the projecting part and is in contact with the end of the heat radiating cylinder 22. Part 34. The flange portion 34 is provided with screw holes 34b that are substantially equally spaced in the circumferential direction. The screw hole of the sealing material 30 described above is provided so as to be aligned with the screw hole 34b of the flange portion 34. The outer peripheral surface of the base holding cylinder 32 is threaded for screwing into the base.

  On the inner peripheral surface of the heat radiating part holding cylinder 31, a plurality of ribs 35, which are holding parts for holding reinforcing members to be described later, are provided at an appropriate distance in the circumferential direction as shown in FIG. As shown in FIG. 5, the rib 35 is formed over an appropriate length along the longitudinal direction of the insulating case 3.

  Further, as shown in FIG. 4, two engagement recesses 36 for engaging a part of the power supply board are provided at the end of the heat radiation portion holding cylinder 31. Each engagement recess 36 is formed by two parallel plate portions that protrude inward from the inner peripheral surface of the heat radiating portion holding cylinder 31 and are separated by an appropriate length (a length substantially equal to the plate thickness of the power supply substrate to be sandwiched). The two engaging recesses 36 are provided at symmetrical positions with respect to the plane including the center line of the insulating case 3.

  On the inner peripheral surface of the connecting portion 33, similarly to the heat radiating portion holding cylinder 31, a plurality of ribs 37, which are holding portions for holding a reinforcing member described later, are provided at an appropriate distance in the circumferential direction. As shown in FIG. 5, the rib 37 is formed over an appropriate length along the longitudinal direction of the insulating case 3.

  The base 4 has a bottomed cylindrical shape, and includes a one-pole terminal 41 formed by screwing the cylindrical portion to be screwed with a socket for a light bulb, and a protruding part on the bottom surface of the base 4 The electrode terminal 42 is provided. The one-pole terminal 41 and the other-pole terminal 42 are electrically insulated. The outer shape of the cylindrical portion of the base 4 is formed in the same shape as, for example, the E26 screw-type base. One end of the electric wire 46 is fixed to the one-pole terminal 41 and the other-pole terminal 42 of the base 4 by soldering or the like. The two electric wires 46 are covered with a protective tube 47 over an appropriate length. The protective tube 47 is made of glass, for example.

  The base 4 is integrated with the insulating case 3 by inserting and fixing the base holding cylinder 32 of the insulating case 3 inside the base 4. A metal case 6 as a reinforcing member is held inside the insulating case 3.

  The metal case 6 has a bottomed cylindrical shape, and is made of, for example, iron. The metal case 6 includes a cylindrical portion 61 along the shape of the insulating case 3 and a bottom portion 62 provided at one end of the cylindrical portion 61. The cylindrical case 61 is separated from the inner peripheral surface of the insulating case 3 by an appropriate length (for example, about 3 mm) so that a gas layer such as air is interposed between the insulating case 3 and the insulating case 3. The shape is slightly smaller than the above. The protruding heights of the ribs 35 and 37 described above ensure a gap (the thickness of a gas layer such as air) between the inner peripheral surface of the insulating case 3 and the outer peripheral surface of the cylindrical portion 61 of the metal case 6. It is set appropriately. The bottom 62 has a disk shape having a pentagonal hole 62a through which the electric wire 46 is inserted. The protective tube 47 described above is provided at a position aligned with the hole 62a of the bottom 62 as shown in FIG. By providing the protective tube 47 so that the longitudinal direction position of the metal case 6 is substantially the same as the bottom portion 62, the wire 46 does not directly contact the peripheral edge of the hole 62 a of the bottom portion 62 of the metal case 6. Can be protected from damage.

  Further, as shown in FIG. 4, an engagement recess 63 is provided at the end of the cylindrical portion 61 of the metal case 6 at a position aligned with the engagement recess 36 provided at the end of the heat radiating portion holding cylinder 31. Formed. Each engagement recess 63 is a rectangular notch formed by notching the end of the cylindrical portion 61 to an appropriate length in the longitudinal direction. The two engaging recesses 63 are provided at symmetrical positions with respect to the plane including the center line of the metal case 6. The engaging recesses 36 and 63 are not limited to the shape of the embodiment as long as they can engage with the power supply board.

  Inside the base 4 is filled with a thermosetting resin 5 as a resin (curable resin) which is a reinforcing material for reinforcing the base. More specifically, as shown in FIG. 5, the thermosetting resin 5 is filled in a cavity surrounded by the base 4, the base holding cylinder 32 of the insulating case 3, and the bottom 62 of the metal case 6. Note that a part of the protective tube 47 is buried in the thermosetting resin 5 as shown in FIG. As the thermosetting resin 5, for example, a resin in which two liquids of polyol and isocyanate are mixed is used. The thermosetting resin 5 has fluidity at the time of filling, and is solidified and cured with time. Since the thermosetting resin 5 has a predetermined strength in the solidified state, the strength of the die 4 can be increased as compared with the case where the thermosetting resin 5 is not filled. Moreover, the thermosetting resin 5 can hold | maintain the electric wire 46 connected to each of the 1 pole terminal 41 and the other pole terminal 42 of the nozzle | cap | die 4 firmly in the solidified state.

  The insulating case 3 is integrated with the heat radiating section 2 by being inserted into the heat radiating cylinder 22 of the heat radiating section 2 from the side of the heat radiating section holding cylinder 31 and fixed with screws 28. More specifically, the seal material 30 is aligned with the groove 22c provided at the end of the heat radiating tube 22 of the heat radiating portion 2, and the screw hole of the seal material 30 is aligned with the screw hole provided at the end of the heat radiating tube 22. So that the screw hole 34b provided in the flange part 34 of the heat radiation part holding cylinder 31 is aligned with the screw hole so that the flange part 34 of the heat radiation part holding cylinder 31 of the insulating case 3 is aligned with the heat radiation part 2. The insulation case 3 is fixed to the heat radiating portion 2 by screwing screws 28 into the screw holes in a state where the heat radiating cylinder 22 is in contact with the heat radiating cylinder 22. The sealing material 30 allows the heat radiation part 2 and the insulating case 3 to be in close contact with each other, and prevents foreign matters such as water droplets from entering the cavity formed by the heat radiation part 2 and the insulating case 3. it can.

  A drive for driving the light source module 1 by supplying power of a predetermined voltage and current to the light source module 1 through an electric wire in the cavity formed by the heat radiation part 2 and the insulating case 3 integrated in this way. A power supply circuit unit 7 as a circuit unit is accommodated. The power supply circuit unit 7 includes a power supply board 71 having a shape corresponding to the vertical cross-sectional shape of the cavity to be accommodated, and a plurality of power supply circuit components mounted on the power supply board 71. Connected to both sides of the power supply board 71 are a bridge diode for full-wave rectification of an AC current supplied from an external AC power supply, a transformer for transforming the rectified power supply voltage to a predetermined voltage, and a primary side and a secondary side of the transformer. Power supply circuit components such as diodes and ICs are distributed and mounted. As the power supply substrate 71, for example, a glass epoxy substrate, a paper phenol substrate, or the like is used.

  A plurality of power supply circuit components 72 are mounted on one surface of the power supply substrate 71 of the power supply circuit unit 7 and supplied to the other surface of the power supply substrate 71 in comparison with the power supply circuit component 72 mounted on one surface. A heat generating component 73, which is a power circuit component that generates a relatively large amount of heat generated by the current, is mounted.

  The power supply circuit unit 7 includes a part of the power supply substrate 71 such that the other side of the power supply substrate 71 (the side on which the heat generating component 73 is mounted) is the heat transfer plate 25 side of the heat dissipation unit 2. As shown by the two-dot chain line in FIG. 4, the engagement recess 36 provided at the end of the heat radiating part holding cylinder 31 of the insulating case 3 and the engagement provided at the end of the cylinder 61 of the metal case 6. The heat sink 2 and the insulating case 3 are formed by engaging with the recess 63 and by engaging the other part of the power supply substrate 71 with the holding portion provided inside the heat radiating tube 22 of the heat radiating portion 2. Held in the cavity. In this holding state, as shown in FIG. 3, the power supply circuit unit 7 is arranged in a cavity formed by the heat radiating unit 2 and the metal case 6, and the power supply circuit component 72 that is a circuit component of the power supply circuit unit 7 and the heat generation. Since a gas layer is provided around the component 73, it is not covered by the thermosetting resin 5 described above.

  Further, the power supply substrate 71 of the power supply circuit unit 7 also has a function of a fixing member for fixing the metal case 6 to the insulating case 3 so as not to move.

  A rectangular plate-like heat conductive sheet 76 is interposed between the other surface of the power supply substrate 71 and the heat transfer plate 25. The size and arrangement of the heat conductive sheet 76 are appropriately determined according to the arrangement of the heat generating components 73. As this heat conductive sheet 76, a heat good conductor having insulating properties is used, and for example, a low-hardness flame-retardant silicone rubber is used. Heat from the power supply circuit unit 7, particularly the heat generating component 73, is transmitted to the heat transfer plate 25 through the heat conductive sheet 76.

  The power supply circuit unit 7 is connected to the other end of the electric wire 46 having one end connected to the one-pole terminal 41 and the other-pole terminal 42 of the base 4, and the power supply circuit unit 7 is electrically connected to the base 4. It is. The power supply circuit unit 7 is electrically connected to the light source module 1 via a connector via an electric wire (not shown). In addition, you may make it electrically connect not using an electric wire but using a pin plug.

  A disc-shaped translucent plate 8 that covers the light emitting direction side of the light source module 1 and diffuses and transmits the light from the LED 12 is attached to the mounting surface 23b of the reflection unit 23 of the heat radiating unit 2. The outer edge portion of the translucent plate 8 has a plurality of engagements engaged with the end portions of the reflection portion 23 of the heat radiating portion 2 and / or the engagement portions provided on the ring cover, which will be described later, at an appropriate distance in the circumferential direction. A joint is provided. The translucent plate 8 is fixed to the heat radiating part 2 with screws or the like with the outer edge part in contact with the mounting surface 23b of the reflecting part 23 of the heat radiating part 2. The translucent plate 8 is made of, for example, milky white polycarbonate resin having excellent impact resistance and heat resistance and appropriately added with a diffusing agent.

  A ring cover 9 is attached to the translucent plate 8. The ring cover 9 is formed in an annular shape having substantially the same diameter as the translucent plate 8, and a protruding portion having a shape matching the shape of the fin 24 of the heat radiating portion 2 is provided on the outer edge portion. The projecting portion is provided with an engaging portion that engages with the engaging portion of the translucent plate 8.

  The lighting device integrated as described above is connected to a commercial AC power source by screwing the base 4 into a socket for a light bulb. In this state, when the power is turned on, an alternating current is supplied to the power supply circuit unit 7 through the base 4, a direct current rectified by the power supply circuit unit 7 is supplied to the light source module 1, and the LED 12 is turned on. To do.

  As the LED 12 is turned on, the LED 12 and the power supply circuit unit 7 mainly generate heat. The heat from the LED 12 is transmitted to the other part of the heat radiating part 2 through the light source holding part 21, and is dissipated from the other part (mainly fins 24) of the heat radiating part 2 to the air outside the lighting device. On the other hand, heat from the power supply circuit unit 7, particularly the heat generating component 73, is transmitted to the other part of the heat radiating unit 2 through the heat transfer plate 25, and from the other part (mainly the fins 24) of the heat radiating unit 2. Dissipated to outside air.

  The lighting device according to the present embodiment described above is a PAR type lighting device, and is configured to obtain brightness corresponding to the incandescent bulb 90W, for example. Thus, when the amount of light is increased to increase the brightness, the amount of heat generated by the LED 12 and the power supply circuit unit 7 increases. It is necessary to increase the size of the heat dissipating unit 2 with the amount of heat generated, and the weight of the entire lighting device increases as the desired brightness increases. When the weight of the entire lighting device increases, for example, when the lighting device is accidentally dropped, a force corresponding to its own weight acts on the lighting device. For this reason, if the inside of the base is left hollow, the base will be deformed and cannot be screwed into the socket for the bulb, the wires inside the base will be disconnected and power from the external power supply will be supplied to the power supply circuit section. There is a possibility that problems such as inability to occur may occur.

  In the illumination device according to the present embodiment, the inside of the base 4 is filled with the thermosetting resin 5 as a resin that is a reinforcing material that reinforces the base 4, so that the resin is not filled. Since the strength of the base 4 can be increased, the deformation of the base 4 can be reduced even if it is accidentally dropped. In addition, by filling the inside of the base 4 with the thermosetting resin 5, connection parts such as the electric wires 46 connected to the base 4 can be firmly held by the thermosetting resin 5, and the base 4 falls into the base 4. Even when the accompanying impact force is applied, the wire 46 and the like can be prevented from being disconnected.

  Further, a gas layer such as air is provided around the circuit components such as the power supply circuit component 72 and the heat generating component 73 housed in the lighting device so that the circuit component is not covered. The thermosetting resin 5 is filled. Although there is a difference in coefficient of thermal expansion between the thermosetting resin 5 and the circuit component, etc., since the thermosetting resin 5 is provided so as not to cover the circuit component, the thermosetting resin 5 is cooled and solidified. In addition, the stress corresponding to the difference in the thermal expansion coefficient does not act on the circuit components such as the power circuit components 72 and the heat generating components 73, the electric wires connected to the circuit components, and the like. As a result, it is possible to prevent damage to circuit components such as the power supply circuit component 72 and the heat generating component 73, breakage of electric wires, etc., and improve the reliability of the lighting device.

  Moreover, since the metal case 6 as the reinforcing member is provided inside the insulating case 3 that electrically insulates between the heat radiation part 2 and the base 4, for example, when the lighting device is accidentally dropped, etc. It is possible to prevent the insulating case 3 from being deformed when a force is applied to the insulating case 3.

  Further, even when circuit components such as the power supply circuit component 72 and the heat generating component 73 housed in the lighting device generate heat due to a failure or the like, the metal case 6 is provided inside the insulating case 3, and the metal case 6 is Since it is formed so as to cover the inner peripheral surface of the insulating case 3 as described above, it is difficult for heat from the circuit components to be transmitted to the insulating case 3, and the temperature of the insulating case 3 is prevented from rising and causing smoke or fire. be able to. And since the power supply circuit part 7 will be accommodated in the cavity formed by the metal metal case 6 and the metal heat dissipation part 2, the periphery of the power supply circuit part 7 can be covered with a metal member. It is possible to prevent the heat or fire from the circuit components from being transmitted to the insulating case 3 and prevent the temperature of the insulating case 3 from rising and generating smoke or fire. As a result, the reliability of the lighting device can be further improved.

  And since the ribs 35 and 37 which are holding | maintenance parts which hold | maintain the metal case 6 are protrudingly provided in the inner surface of the insulation case 3, while reducing the area which contacts the metal case 6, the inner surface and metal of the insulation case 3 A gas layer such as air can be interposed between the case 6 and the case 6. By interposing the gas layer, the gas layer fulfills the function of a heat insulating material, so that heat is more difficult to transfer from the metal case 6 to the insulating case 3. As a result, it is possible to reduce the amount of heat transferred to the insulating case 3 when circuit components such as the power supply circuit component 72 and the heat generating component 73 housed in the lighting device generate heat due to a failure or the like. It becomes possible to prevent more reliably that the temperature of No. 3 rises and emits smoke or fire. As a result, the reliability of the lighting device can be further improved.

  Further, the power supply circuit unit 7 is provided with a part of the power supply substrate 71 at the engagement recess 36 provided at the end of the heat radiating part holding cylinder 31 of the insulating case 3 and the end of the cylinder part 61 of the metal case 6. Since the engaging recess 63 is engaged, the metal case 6 can be held between the insulating case 3 and the power supply substrate 71 so as not to move. Since the metal case 6 does not move inside the lighting device when the lighting device is moved, it is possible to avoid giving the user a sense of incongruity.

  Further, since the thermosetting resin 5 which is a resin is used as a reinforcing material for reinforcing the base 4, the reinforcing material can be easily filled in the base 4 without a gap, and the strength of the base 4 is further increased. be able to.

  In the above embodiment, the thermosetting resin 5 is used as the reinforcing material filled in the base 4. However, any material that can reinforce the base 4 may be used. A cured resin or an adhesive may be used. The reinforcing material is desirably a material that has fluidity at the time of filling and that hardens after filling. The reinforcing material is more preferably made of a highly flame-retardant material equivalent to grade V0 of the United States UL (Underwriters, Laboratories, Incorporated) standard.

  Further, it is conceivable to use a material having good thermal conductivity as the reinforcing material. Thereby, the heat from the power supply circuit unit 7 can be dissipated from the base 4.

  Moreover, in the above embodiment, although the metal case 6 made of iron is used as the reinforcing member, it is made of a material capable of preventing deformation and fire spread of the insulating case 3, and has a desired strength and flame retardancy. Any material may be used. For example, it may be made of aluminum or non-woven fabric.

  Moreover, in the above embodiment, the ribs 35 and 37 are provided on the inner surface of the insulating case 3 as the holding portion, but the shape of the holding portion is not limited to this. The holding part may have a shape in which an air layer is interposed between the insulating case 3 and the metal case 6 while keeping the contact area between the insulating case 3 and the metal case 6 small. For example, a plurality of cylindrical and prismatic projecting portions may be projected in the radial direction of the insulating case 3. Although the ribs 35 and 37 are formed along the longitudinal direction of the insulating case 3, they may be formed along the circumferential direction of the insulating case 3 or may be formed in a spiral shape.

  In the above embodiment, the insulating case 3 is configured to be fitted to the heat radiating portion 2, but the metal case 6 may be configured to be fitted to the heat radiating portion 2. In this case, for example, the end portion of the heat radiating cylinder 22 of the heat radiating portion 2 is projected inward in the radial direction, and a groove into which the metal case 6 is fitted may be formed in the projected portion. In this way, the metal case 6 is configured to fit into the heat radiating portion 2, so that the power supply circuit portion 7 is enclosed in a cavity formed by the metal metal case and the metal heat radiating portion. Therefore, the safety can be further improved and the reliability of the lighting device can be improved.

  Moreover, although the illuminating device which used LED as a light source was illustrated in the above embodiment, a light source is not limited to LED, Light sources, such as an incandescent lamp, a fluorescent lamp, and EL (electroluminescence), may be sufficient.

  Further, in the above embodiment, the lighting device attached to the socket for the light bulb has been described as an example. However, the structure for improving the strength of the base described above is not limited to such a lighting device, but other types of lighting. Needless to say, the present invention can be applied to the apparatus, and can be implemented in variously modified forms within the scope of the matters described in the claims.

1 Light source module (light source)
2 Heat radiation part (main part)
3 Insulation case (insulator)
35, 37 Rib (holding part)
36 Engagement recess 4 Base 5 Thermosetting resin (resin, curable resin)
6 Metal case (reinforcing member)
63 Engaging recess 7 Power supply circuit (drive circuit)
71 Power supply board (board)
72 Power circuit components (circuit components)
73 Heating parts (circuit parts)

Claims (6)

A light source composed of LEDs;
The light source is attached and a metal main body that dissipates heat from the light source;
In a lighting device comprising a base provided via a cylindrical insulator made of resin on one end side of the main body,
A reinforcing member is provided inside the insulator,
An illumination device, wherein a drive circuit unit for driving the light source is accommodated in a cavity formed by the main body and the reinforcing member.   The lighting device according to claim 1, wherein the reinforcing member is a metal case. The reinforcing member has a bottomed cylindrical shape,
The bottom portion has a hole through which an electric wire connecting the drive circuit portion and the base is inserted,
The lighting device according to claim 1, wherein a protective tube is placed at a position corresponding to the hole of the electric wire.   The lighting device according to claim 1, wherein a holding portion that holds the reinforcing member protrudes from an inner surface of the insulator. The drive circuit unit includes a substrate on which the circuit component is mounted,
The lighting device according to any one of claims 1 to 4, wherein the insulator and the reinforcing member are each provided with an engaging recess with which a part of the substrate is engaged.   6. The lighting device according to claim 1, wherein the lighting device is a PAR type lighting device.

Images