JP2010153245A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system which can sufficiently diffuse heat from both of a light source and a power circuit part. <P>SOLUTION: The lighting system 100 includes a light source module 3, a heat dissipating body which dissipates heat from the light source module 3 and has a cavity, and the power circuit part 6 housed in the cavity of the heat dissipating body and driving the light source module 3. The light source module 3 is mounted on a portion of the heat dissipating body. The power circuit part 6 is arranged to separate from the light source module 3 and conduct heat to the heat dissipating body. As the two heat generating sources of the light source module 3 and the power circuit part 6 are mounted in separate positions to conduct heat to the heat dissipating body, the generated heat can be conducted to the heat dissipating body and is diffused to an external, and heat from both of the light source module 3 and power circuit part 6 can be sufficiently diffused. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illumination device configured to improve heat dissipation.

  The lighting device has heat-generating components such as a light source and a power supply circuit unit. For this reason, in order to ensure the performance of the heat generating component, it is necessary to configure the lighting device so as to suppress the temperature increase of the heat generating component and suppress the temperature increase of the outer surface of the lighting device from the viewpoint of safety. In particular, in an illuminating device using a light emitting diode (hereinafter referred to as LED) as a light source, as the temperature of the LED rises, the lifetime characteristic of the LED deteriorates, the light emission efficiency decreases, and it becomes difficult to secure a necessary amount of light. Since there is a possibility that a problem may occur, it is necessary to have a structure with good heat dissipation in order to suppress the temperature rise of the LED. In view of this, lighting devices having various heat dissipation structures have been proposed in order to dissipate the heat generated by the heat generating components to the outside air (see, for example, Patent Document 1).

  The lighting fixture disclosed in Patent Document 1 includes a power source circuit portion, a fixture main body having a light source placement portion with good thermal conductivity, a substrate on which a light source is placed, and a reflection for controlling light from the light source. And a fixing means for fixing the reflector to the instrument body, the substrate is sandwiched between the instrument body and the reflector, and the substrate is closely attached to the instrument body by tightening by the fixing means. is there.

As a result, the heat generated in the light source is directly transmitted to the light source arrangement portion of the instrument main body fixed in close contact with the substrate, and further directly transmitted to the side wall of the instrument main body to the outside air from the outer peripheral surface of the instrument main body. Since the heat is radiated, the heat from the light source can be effectively dissipated.
JP 2008-204692 A

  However, the lighting apparatus according to Patent Document 1 is not configured to effectively dissipate heat generated in the power supply circuit unit. In this lighting fixture, the power supply circuit portion is fixed to the supporting step portions provided at three locations on the inner surface of the fixture main body at an appropriate distance from the light source arrangement portion so as to ensure an electrical insulation distance. The heat from the circuit part is transmitted from the support step part to the instrument body and can be dissipated to the outside, but the contact area between the power circuit part and the support step part is not sufficient, and the power supply The supporting step portion to which the circuit portion is attached is near the light source arrangement portion to which the light source is attached. For this reason, the temperature of the power supply circuit unit rises, which may adversely affect the operation of the power supply circuit unit.

  This invention is made | formed in view of such a situation, and it aims at providing the illuminating device comprised so that the heat from both a light source and a power supply circuit part could fully be dissipated.

  An illuminating device according to the present invention includes a light source, a heat radiating body that dissipates heat from the light source, and a cavity, and a power supply circuit unit that is housed in the cavity of the radiating body and drives the light source. The light source is attached to a part of the heat radiating body, and the power supply circuit portion is provided so as to be thermally conductive to the heat radiating body apart from the light source.

  The present invention includes a light source, a heat radiator that dissipates heat from the light source and has a cavity, and a power supply circuit unit accommodated in the cavity of the heat radiator, and the light source is attached to a part of the radiator. The power supply circuit unit is provided so as to be thermally conductive to the heat dissipating member apart from the light source. As described above, since the two heat sources such as the light source and the power supply circuit unit are attached to the heat dissipating body at positions separated from each other, the generated heat is transmitted to the heat dissipating body from the separated positions and is externally transmitted. The heat from both the light source and the power supply circuit can be sufficiently dissipated.

  In the lighting device according to the present invention, the radiator has a bottomed cylindrical body having the light source attached to a bottom surface thereof, and a lid portion that closes the bottomed cylindrical body. The power supply circuit portion is provided so as to be conductive.

  In the present invention, the light source is attached to the bottom surface of the bottomed cylindrical body of the heat radiating body, and the power supply circuit portion is provided so that heat can be conducted to the lid portion that closes the bottomed cylindrical body. In this way, the light source is attached to one side of the radiator and the power supply circuit unit is attached to the other side, so that heat from the light source is mainly transmitted to the bottomed cylindrical body of the radiator while Is mainly transmitted to the lid portion of the radiator, and can sufficiently dissipate heat from both the light source and the power supply circuit portion.

  In the lighting device according to the present invention, the power supply circuit unit has a substrate on which electronic components are mounted on one surface, and is provided so that heat can be conducted to the lid on the other surface of the substrate. It is characterized by.

  In the present invention, the power supply circuit unit having the substrate on which the electronic component is mounted on one surface is provided so as to be able to conduct heat to the lid portion on the other surface of the substrate. By appropriately providing the power supply circuit section on the lid, for example, by providing heat conduction to the cover on the entire other surface of the substrate, the heat generated in the power circuit section heats almost the entire surface of the substrate. Since the passage area is transmitted to the lid portion, the heat from the power supply circuit portion can be more sufficiently dissipated.

  The lighting device according to the present invention is characterized in that a heat conductive sheet is interposed between the power supply circuit portion and the lid portion.

  In the present invention, since the heat conductive sheet is interposed between the power supply circuit portion and the lid portion, the heat from the power supply circuit portion can be more sufficiently dissipated.

  In the illumination device according to the present invention, the light source is an LED.

  In the present invention, an LED is used as a light source. Since the LED is small and has a high degree of freedom in layout design, it is possible to efficiently dissipate the heat generated by the LED to the outside air by appropriately arranging the LED on the heat radiator.

  According to the present invention, heat from both the light source and the power supply circuit unit can be sufficiently dissipated.

Hereinafter, the present invention will be described in detail by taking an example of a so-called downlight or other embedded illumination device based on the drawings showing the embodiments thereof.
(Embodiment 1)
FIG. 1 is a schematic external exploded perspective view of lighting apparatus 100 according to Embodiment 1 of the present invention. FIG. 2 is a schematic longitudinal sectional view of the lighting device 100.

  In the figure, 1 is a heat sink made of metal such as aluminum. The heat sink 1 includes a bottomed cylinder 13 having a disk-shaped heat transfer plate 11 and a cylindrical heat transfer cylinder 12 erected on the periphery of one surface 11 a of the heat transfer plate 11. FIG. 3 is a schematic perspective view of the heat sink 1, as seen from the opening side of the bottomed cylindrical body 13. FIG. 4 is a schematic bottom view of the heat sink 1 and is a view of the heat sink 1 as viewed from the heat transfer plate 11 side.

  A plurality of fins 14, 14... Are provided on the outer surface of the heat transfer cylinder 12 of the heat sink 1. The plurality of fins 14, 14... Are evenly arranged in the circumferential direction on the outer surface of the heat transfer cylinder 12, and project in the radial direction over substantially the entire length of the heat transfer cylinder 12. Further, as shown in FIG. 3, the heat transfer cylinder 12 of the heat sink 1 is provided with boss portions 12a, 12a. As shown in FIG. 2, the thickness of the heat transfer cylinder 12 is continuously changed along the axial direction of the heat transfer cylinder 12 so that the open end side is thinned. The fins 14, 14... Are formed so that the projecting height is continuously changed from the heat transfer plate 11 side of the heat transfer cylinder 12 toward the open end side so that the heat transfer plate 11 side becomes higher. It is.

  On the opening side of the bottomed cylindrical body 13 of the heat sink 1, a lid portion 2 is provided. As shown in FIG. 1, the lid part 2 has a substantially triangular shape, and includes a plate part 21 having a circular hole 21 a in the center, and a peripheral wall part 22 standing on the periphery of the plate part 21. . The lid 2 is made of a material having good heat transfer characteristics, and is made of a metal such as stainless steel, for example. The plate portion 21 of the lid portion 2 is provided with screw holes 21b, 21b... On a line connecting the center of the circular hole 21a and each vertex of the triangle. The lid portion 2 is integrated with the heat sink 1 by screwing screws 23, 23 ... to the screw holes 21b, 21b ... and the boss portions 12a, 12a ... provided on the heat transfer cylinder 12 of the heat sink 1. . The heat sink 1 and the lid 2 constitute a heat radiator that dissipates heat from the light source.

  A light source module 3, which is a light source, is attached to the other surface 11 b of the heat transfer plate 11 of the heat sink 1. As shown in FIG. 1, the light source module 3 is formed by mounting a plurality of first LEDs 32, 32... And second LEDs 33, 33. The first LED 32 and the second LED 33 are, for example, a surface-mounted white LED and a red LED each including an LED element, a sealing resin that seals the LED element, and an input terminal and an output terminal. . A phosphor is dispersed in the sealing resin of the first LED 32 that is a white LED. In addition, the illumination light of the illuminating device 100 is configured to change from daylight white to a light bulb color by changing the light emission intensity of the first LEDs 32, 32... And the second LEDs 33, 33.

  The light source module 3 is fixed to the other surface 11b of the heat transfer plate 11 of the heat sink 1 with screws 35, 35... The LED substrate 31 is preferably made of a metal such as aluminum. Further, it is desirable to interpose a heat conductive sheet or grease between the light source module 3 and the heat transfer plate 11 and between the LEDs 32, 32..., 33, 33. As a result, the heat generated in the light source module 3 is transmitted to the heat transfer cylinder 12 and the fins 14, 14... Via the heat transfer plate 11, and is naturally convected from the heat transfer cylinder 12 and the fins 14, 14. It will be dissipated.

  The other surface 11b of the heat transfer plate 11 is provided with an engaging groove 11c that engages with a reflector 4 described later. The engagement groove 11 c is an annular groove having a diameter larger than the diameter of the disk portion of the LED substrate 31. As shown in FIG. 4, the engagement groove 11c has a plurality of deep groove portions 11d, 11d,... Deeper than other portions of the engagement groove 11c at a plurality of locations in the circumferential direction (three locations in the figure). ing. The deep groove portions 11d, 11d,... Are continuously changed in depth in the circumferential direction.

  On the side of the heat transfer plate 11 of the heat transfer cylinder 12 of the heat sink 1, a plurality of boss portions 11e, 11e,... Are provided between the fins 14, 14,.

  FIG. 5 is a schematic perspective view of the reflector 4. The reflector 4 includes a disc-like reflector 41, a cylindrical reflector 42 erected on the peripheral edge of the reflector 41, and extends radially outward from the end of the reflector 42. And an annular flange 43 formed. The reflector 4 is made of a material having a high reflectance, and is made of, for example, a polycarbonate resin.

  The reflecting plate 41 is provided with an annular protrusion 41a that is erected concentrically in alignment with the engaging groove 11c in a direction orthogonal to the reflecting plate 41. The protrusion 41a has engaging protrusions 41b, 41b,... That are aligned with the deep grooves 11d, 11d,. The engaging protrusion 41b is formed in a triangular shape by changing the protruding height continuously in the longitudinal direction of the protrusion 41a. On the inner side of the protrusion 41a of the reflector 41, through holes 41c, 41c,... Are provided at positions aligned with the first LEDs 32, 32,. On the outer side of the protrusion 41a of the reflector 41, circular holes 41d, 41d,...

  The diameter of the reflecting cylinder 42 is continuously increased from the reflecting plate 41 side toward the flange portion 43 side. On the inner surface of the reflecting tube 42, there are provided engaging projections 42a, 42a,. Further, on the inner surface of the reflecting tube 42, stoppers 42 b, 42 b... Projecting in a radially inward direction from the reflecting plate 41 side of the reflecting tube 42 toward the flange 43 side are engaged. The projections 42a, 42a,... Are arranged in a three-degree arrangement with a predetermined angle (for example, 60 °) shifted in the circumferential direction. The stopper 42b is formed so that the end of the stopper 42b is separated from the end face of the reflecting tube 42 on the flange 43 side by an appropriate length and is positioned closer to the flange 43 than the engaging protrusion 42a.

  The reflector 4 is inserted into the circular holes 41d, 41d, with the engaging protrusions 41b, 41b, ... of the protrusion 41a engaged with the deep grooves 11d, 11d, ... of the engaging groove 11c of the heat sink 1. The screws 45, 45... Are integrated with the heat sink 1 by screwing them into the boss portions 11e, 11e. The light from the light source module 3 is reflected by the reflecting plate 41 and the reflecting tube 42 of the reflector 4 and is included in a range in which the angle formed with the optical axis of the light source module 3 is a predetermined angle or less. The light whose light distribution characteristics are controlled so that the illuminance directly below the device becomes strong is emitted from the lighting device.

  Inside the reflector 4, a light transmitting plate 5 that transmits light from the light source module 3 is provided. The translucent plate 5 is made of, for example, polycarbonate resin, and includes a disc 51 and a peripheral wall 52 erected on the periphery of the disc 51. On the peripheral wall 52 of the translucent plate 5, engagement claws 53, 53... Extending in the same direction as the peripheral wall 52 are provided in alignment with the engagement protrusions 42 a, 42 a. The translucent plate 5 is pushed into the reflecting tube 42 from the side of the engaging claws 53, 53... And the engaging claws 53, 53. Will be mounted on. At this time, the stoppers 42b, 42b... Prevent the transparent plate 5 from being pushed into the reflection tube 42, so that the transparent plate 5 can be held at an appropriate position separated from the light source module 3. For example, the first LED 32, 32... Is held by holding the light transmitting plate 5 at a position spaced apart from the light source module 3 by a distance equal to or greater than the distance between the plurality of LEDs 32, 32. And the light from the second LEDs 33, 33... Can be superimposed to form a uniform light emitting surface.

  A power supply circuit unit 6 for driving the light source module 3 is accommodated in a cavity of the heat radiating body including the heat sink 1 and the lid portion 2 (a space surrounded by the bottomed cylindrical body 13 of the heat sink 1 and the lid portion 2). . The power supply circuit unit 6 includes a circuit board 61 having a disk shape and an electronic component 62 mounted on the circuit board 61. In the figure, the electronic component 62 is schematically indicated by a rectangular block, but is composed of various circuit components such as a transformer, a resistor, and a capacitor.

  An insulator 7 is provided between the power circuit 6 and the heat sink 1 and the lid 2. The insulator 7 connects the cylindrical power circuit holding cylinder 71 that holds the power circuit section 6, the cylindrical base holding cylinder 72 that holds the base 8, and the power circuit holding cylinder 71 and the base holding cylinder 72. And an annular connecting portion 73. The insulator 7 is made of an electrically insulating material, for example, made of PBT (polybutylene terephthalate) or ceramics such as heat-resistant porcelain.

  6 and 7 are schematic perspective views of the insulator 7. 6 is a view of the insulator 7 as seen from the base holding cylinder 72 side, and FIG. 7 is a view of the insulator 7 as seen from the power supply circuit holding cylinder 71 side. On the inner surface of the power supply circuit holding cylinder 71, there are provided engagement projections 74a, 74a,... That are arranged in three circumferential directions and project inward in the radial direction and have a triangular longitudinal section. The engaging protrusion 74a is provided in the mounting portion 74, which is formed by cutting out a part of the power circuit holding cylinder 71 and the connecting portion 73 and has a substantially L-shaped longitudinal section. The attachment portion 74 is formed over an appropriate length along the axial direction of the power supply circuit holding cylinder 71 so that it can be elastically deformed when a force is applied to the engagement protrusion 74a.

  Further, on the inner surface of the insulator 7, stepped portions 75, 75... Projecting from the boundary portion between the power circuit holding cylinder 71 and the connecting portion 73 and the engagement projections 74 a, 74 a. , 60 °) and are arranged in three equal positions. The stepped portion 75 is provided such that the end surface of the stepped portion 75 is separated from the surface of the connecting portion 73 by an appropriate length and is positioned closer to the connecting portion 73 than the engaging protrusion 74a.

  Further, as shown in FIG. 2 and FIG. 6, the outer surface of the base holding cylinder 72 of the insulator 7 has a first protrusion 72a, 72a that is equally spaced in the circumferential direction, and the first protrusion 72a, A second protrusion 72b and a third protrusion 72c are provided on the opening end side of the first protrusions 72a and 72a at the same circumferential position as each of 72a. These protrusions 72 a, 72 a, 72 b, 72 c are protruded from the outer surface of the base holding cylinder 72 in a hemispherical shape radially outward. The first protrusions 72a and 72a are provided at the same position in the axial direction of the base holding cylinder 72, and the third protrusion 72c is provided closer to the opening end than the second protrusion 72b.

  Inside the power circuit holding cylinder 71 of the insulator 7, the power circuit section 6 described above is attached. The power supply circuit section 6 is pushed into the power supply circuit holding cylinder 71 from the circuit board 61 side, and the circuit board 61 is engaged with the engagement protrusions 74a, 74a, so that the power supply circuit holding cylinder is shown in FIG. 71 is attached. More specifically, when the circuit board 61 is pushed in, the engagement protrusions 74a, 74a,... Are pressed by the circuit board 61, and an oblique outward force acts on the attachment parts 74, 74, so that the attachment parts 74, 74 are pressed. … Is elastically deformed. Further, when the circuit board 61 is pushed in, the circuit board 61 passes through the engagement protrusions 74a, 74a, so that the working force is lost, so that the mounting portions 74, 74,... Return to their original positions, and the circuit board 61 holds the power circuit. It will be latched by engagement protrusion 74a, 74a ... so that it may not fall out from cylinder 71. At this time, the stepped portion 75 prevents the power supply circuit portion 6 from being pushed into the power supply circuit holding cylinder 71, so that the power supply circuit portion 6 can be held at an appropriate position separated from the connecting portion 73.

  The insulator 7 to which the power circuit section 6 is attached in this way is inserted into the heat sink 1 so that the power circuit holding cylinder 71 side is on the heat transfer plate 11 side of the heat sink 1 and then the lid 7 as described above. The part 2 is attached to the heat sink 1 and is further integrated with the lid part 2 by attaching an insulating nut 85 and a base 8 to the base holding cylinder 72 of the insulator 7. A heat conductive sheet 60 is interposed between the connecting portion 73 of the insulator 7 and the circuit board 61. The heat conductive sheet 60 is made of, for example, a silicon resin having good heat conductivity. Thereby, the heat generated in the power supply circuit unit 6 is transmitted to the lid unit 2 via the heat conductive sheet 60 and the insulator 7 and is radiated from the lid unit 2 to the outside air by natural convection. Since heat can be conducted to the lid portion 2 over substantially the entire surface of the circuit board 61, the heat passage area can be increased, and the heat from the power supply circuit portion 6 can be sufficiently dissipated.

  FIG. 8 is a schematic perspective view of the insulating nut 85. The insulating nut 85 has a so-called hexagonal outer shape, and U grooves 85b and 85b along the axial direction are provided on the inner surface 85a so as to be equally spaced in the circumferential direction. On one surface 85c of the insulating nut 85, slopes 85d and 85d are provided over the inner peripheral edge from the U grooves 85b and 85b over about 90 °. The slope 85d is formed so that the depth in the axial direction continuously increases toward the U groove 85b. The insulating nut 85 is made of an electrically insulating material, and is made of, for example, PBT (polybutylene terephthalate) or ceramics such as heat-resistant porcelain.

  The insulating nut 85 is insulated after aligning the circumferential positions of the protrusions 72a, 72a, 72b, 72c of the base holding cylinder 72 of the insulator 7 and the U grooves 85b, 85b so that the one surface 85c side is on the upper side. By moving the base holding cylinder 72 through the inner surface 85a of the nut 85 to the connecting portion 73 side and rotating it in a predetermined direction (clockwise in the figure) in a state of being in contact with the lid portion 2, The lid 2 is integrated. At this time, the slopes 85d, 85d and the first protrusions 72a, 72a are engaged, and the lid portion 2 is tightened from both sides by the connecting portion 73 of the insulator 7 and the insulating nut 85. The connecting portion 73 contacts the lid portion 2 on the surface. As a result, the insulator 7 and the lid portion 2 are integrated, and heat conduction between the insulator 7 and the lid portion 2 can be favorably maintained.

  A base 8 is provided in the base holding cylinder 72 of the insulator 7. The base 8 includes a one-pole terminal 81 having a cylindrical portion that is threaded to be screwed into a socket for a light bulb, and an other-pole terminal 82 that projects from the bottom surface of the base 8. The base 8 is moved toward the connecting portion 73 so that the base holding cylinder 72 of the insulator 7 is inserted therein, and is rotated in a predetermined direction so that each of the second protrusion 72b and the third protrusion 72c is the base. 8 is fixed to the base holding cylinder 72 by screwing with the inner surface of the one-pole terminal 81. The one-pole terminal 81 and the other-pole terminal 82 of the base 8 are insulated. The one-pole terminal 81 and the other-pole terminal 82 of the base 8 are electrically connected to the power supply circuit unit 6 through lead wires (not shown). The power supply circuit unit 6 is electrically connected to the light source module 3 via a lead wire (not shown).

  Plate springs 9 are attached to the plate portion 21 of the lid portion 2. FIG. 9 is a schematic perspective view of the leaf spring 9. FIG. 10 is a schematic plan view of the lighting device 100.

  The leaf spring 9 is made of a metal such as stainless steel, and is formed into a shape shown in FIG. 9 by bending an elongated rectangular plate. An attachment portion 91 is provided on one side of the leaf spring 9, and a through hole 91 a is formed in the approximate center of the attachment portion 91. The attachment portion 91 is provided with an arm portion 92 extending from the attachment portion 91, and the other side of the leaf spring 9 sandwiching the arm portion 92 extends at an obtuse angle with the arm portion 92. A holding portion 93 that holds the device 100 on a holding member such as a ceiling is provided.

  A plurality of (four in the figure) pressing pieces 94, 94... Extend from the periphery of the through hole 91 a toward the center of the through hole 91 a at an angle from the periphery of the through hole 91 a. It is arranged in four directions in the direction. Further, on the side of the mounting portion 91 of the arm portion 92, there is provided a locking concave portion 92a having a hemispherical shell shape protruding in the same direction as the pressing pieces 94, 94.

  The leaf spring 9 is formed by screwing the screw 23 inserted through the through hole 91a of the mounting portion 91 into the screw hole 21b of the lid portion 2 and the boss portion 12a provided on the heat transfer cylinder 12 of the heat sink 1. It is attached to part 2. As shown in FIG. 10, three leaf springs 9, 9... The first convex portions 21c, 21c,... And the second convex portions 21d, 21d,... Projecting in a direction perpendicular to the plate portion 21 are adjacent to the screw holes 21b, 21b. Respectively. The first protrusions 21c, 21c,... And the second protrusions 21d, 21d,... Have shapes that can be engaged with the locking recesses 92a, 92a,.

  The leaf springs 9, 9... Are held at an angular position indicated by a two-dot chain line in FIG. This holding state is realized by engaging the locking recesses 92a, 92a... Of the leaf springs 9, 9... With the first protrusions 21c, 21c. When the lighting device 100 is installed in the embedding hole provided in the ceiling, the leaf springs 9, 9... Are rotated to a predetermined angular position indicated by a solid line in FIG. The leaf springs 9, 9 ... are held at predetermined angular positions by engaging the recesses 92a, 92a ... with the second protrusions 21d, 21d .... The longitudinal directions of the leaf springs 9, 9... Coincide with the radial direction of the heat sink 1 and are arranged in three equal parts in the circumferential direction.

  The lid 2 to which the leaf springs 9, 9... Are attached has a substantially triangular shape, but is not limited to this shape, and is a plate that holds the lighting device 100 in an embedding hole provided in the ceiling. It is sufficient that the springs 9, 9... Have sufficient rigidity so that they can be stably attached, and that the natural convection flowing between the fins 14, 14.

  A fastening force of the screw 23 acts on the pressing pieces 94 of the leaf spring 9. The pressing pieces 94, 94... Have appropriate rigidity so that the pressing pieces 94, 94... Do not contact the entire surface of the lid portion 2 due to the tightening force of the screws 23. Are appropriately provided so that the restoring force of 94, 94... Acts and the leaf springs 9, 9... Can be rotated around the screws 23, 23. . By using such a leaf spring 9, the tightening force acting on the lid 2 can be made substantially constant, and the force required when the leaf spring 9 is rotated can be made constant. Thus, since the leaf washer 9 according to the present embodiment is integrated with the wave washer, the number of parts can be reduced and workability can be improved. In the embodiment, four pressing pieces 94, 94... Are provided, but the present invention is not limited to this, and for example, three or five or more may be used.

  The illuminating device 100 configured as described above is fixed to an embedding hole provided in the ceiling with the light-transmitting plate 5 side facing down, and is used as a so-called downlight. It is done. The base 8 of the lighting device 100 is connected to a socket provided inside the embedding hole.

  Illumination device 100 according to the present embodiment is assembled, for example, according to the following procedure. First, the light source module 3 is attached to the other surface 11 b of the heat transfer plate 11 of the heat sink 1. Next, the insulator 7 in which the power circuit section 6 is held by engagement is inserted into the bottomed cylinder 13 of the heat sink 1 from the power circuit holding cylinder 71 side. The lid 2 is attached to the bottomed cylinder 13 of the heat sink 1 to close the bottomed cylinder 13, and the insulating nut 85 and the base 8 are attached to the base holding cylinder 72 of the insulator 7 protruding from the lid 2. Are sequentially screwed together. Next, the protrusions 41 a of the reflector 41 of the reflector 4 are engaged with the engaging grooves 11 c of the heat transfer plate 11 of the heat sink 1, and the reflector 4 is attached to the heat sink 1. The translucent plate 5 is inserted into and engaged. As described above, the lighting device 100 is integrated.

  As described above, since it includes many steps of integration by engaging or screwing by an operator's hand without using a tool, workability and assembly can be achieved rather than including many steps of integration by bonding and screwing. Good properties. In addition, most components can be assembled sequentially from the light emitting direction side of the light source module 3 (upper side in the figure), and workability and assemblability can be improved.

  In the assembly of the heat sink 1 and the reflector 4, as described above, the protrusion 41a of the reflector 41 of the reflector 4 is engaged with the engaging groove 11c of the heat transfer plate 11 of the heat sink 1, and the reflector 4 is relatively moved. Since the rotating projections 41b, 41b,... Of the reflector 4 are engaged with the deep grooves 11d, 11d of the engaging groove 11c of the heat sink 1, the heat sink 1 and the reflector 4 are aligned. Are aligned with respect to the outer shape and relative rotation is performed, so that the circumferential alignment can be performed easily and reliably, and workability can be improved.

  In addition, since the joining portion of the heat sink 1 and the reflector 4 is configured in a labyrinth shape by the engaging groove 11c and the protrusion 41a, the above-described alignment is possible, and water droplets generated by dew condensation or the like are light source modules. 3 can be prevented from entering. The mounting screws 45, 45 ... between the heat sink 1 and the reflector 4 and the mounting screws 23, 23 ... between the heat sink 1 and the lid 2 are respectively screwed into boss portions 11e, 11e ..., 12a, 12a ... Is provided so as not to penetrate the power supply circuit section 6 and the housing portion of the light source module 3, and the engaging section between the translucent plate 5 and the reflector 4 is provided inside the reflector 4. 6 and the light source module 3 can be prevented from entering water droplets, and the power supply circuit unit 6 and the light source module 3 can be prevented from being adversely affected.

  In the illuminating device 100 configured as described above, the light source module 3 is attached to the other surface 11b of the heat transfer plate 11 of the bottomed cylindrical body 13 of the heat sink 1 constituting the heat radiating body, and the lid portion also constituting the heat radiating body. 2 is provided so that heat can be conducted to 2, heat from the light source module 3 is mainly transmitted to the bottomed cylinder 13, while heat from the power circuit 6 is mainly transmitted to the lid 2. As a result, the heat from both the light source module 3 and the power supply circuit unit 6 can be sufficiently dissipated.

  Since the power supply circuit unit 6 having the circuit board 61 on which the electronic component 62 is mounted on one side is provided so as to be able to conduct heat to the lid part 2 over almost the other side of the circuit board 61, the power supply circuit unit 6 Since the heat generated in step 1 can be conducted to the lid portion 2 over almost the entire surface of the circuit board 61, the heat passage area can be increased, and the heat from the power supply circuit portion 6 can be sufficiently dissipated. . Since the heat conductive sheet 60 is interposed between the power supply circuit unit 6 and the lid 2, the heat from the power supply circuit unit 6 can be more sufficiently dissipated.

  Since the LEDs 32, 32... 33, 33... Are small and have a high degree of freedom in layout design, the LEDs 32, 32... 33, 33,. It is possible to efficiently dissipate the heat generated by 33...

(Embodiment 2)
FIG. 11 is a schematic longitudinal sectional view of the illumination device 200 according to Embodiment 2 of the present invention. The lighting device 100 according to the first embodiment is configured such that power is supplied from a commercial power source to the power supply circuit unit 6 via the base 8. However, the lighting device 200 according to the present embodiment is a commercial power source. The power supply circuit unit 6 is configured to be supplied with power through a lead wire (not shown) connected to the power supply.

  Boss portions 12b, 12b... Are provided outside the heat transfer cylinder 12 of the heat sink 1. The lid portion 2 is integrated with the heat sink 1 by screwing screws 23 into boss portions 12b, 12b... Provided in the heat sink 1 and screw holes 21b, 21b.

  A light source module 3a as a light source is attached to the other surface 11b of the heat transfer plate 11 of the heat sink 1. The light source module 3a is formed, for example, by mounting a plurality of LEDs 37, 37... On an LED substrate 36 having a substantially disc shape. The LED 37 is formed by sealing a plurality of LED elements densely mounted on the central portion of one surface of a rectangular ceramic (for example, aluminum oxide) substrate with a sealing resin in which phosphors are dispersed. It is desirable to interpose a heat conductive sheet or grease between the light source module 3a and the heat transfer plate 11 and between the LEDs 37, 37.

  Inside the heat sink 1, an insulator 7a having a bottomed cylindrical shape is accommodated. The insulator 7 a includes a disc portion 76 and a cylindrical power supply circuit holding cylinder 77 that is erected on the periphery of the disc portion 76. On the inner surface of the power supply circuit holding cylinder 77, a holding part that protrudes radially inward at a plurality of locations in the circumferential direction and protrudes in a strip shape along the axial direction, and holds the power supply circuit part 6. 78 is provided. The insulator 7 a is inserted into the heat sink 1 so that the disk portion 76 side is on the heat transfer plate 11 side of the heat sink 1.

  In the lighting device 200 according to the present embodiment, the screws 45, 45... In which the heat sink 1 and the reflector 4 are inserted into the plurality of boss portions 11e, 11e. The plurality of boss portions provided on the outside are integrated by screwing. Since other configurations are the same as those of the first embodiment shown in FIG. 2, the same reference numerals as those in FIG. 2 are given to corresponding components, and detailed descriptions of the configurations and effects are omitted.

  In lighting device 200 configured as described above, light source is provided on other surface 11b of heat transfer plate 11 of bottomed cylindrical body 13 of heat sink 1 constituting the heat sink, similarly to lighting device 100 according to Embodiment 1. Since the module 3a is attached and the power supply circuit section 6 is provided so that heat can be conducted to the lid section 2 that also constitutes a heat radiator, heat from the light source module 3a is mainly transmitted to the bottomed cylindrical body 13, The heat from the power supply circuit section 6 is mainly transmitted to the lid section 2, and the heat from both the light source module 3a and the power supply circuit section 6 can be sufficiently dissipated.

  Since the power supply circuit unit 6 having the circuit board 61 on which the electronic component 62 is mounted on one side is provided so as to be able to conduct heat to the lid part 2 over almost the other side of the circuit board 61, the power supply circuit unit 6 Since the heat generated in step 1 can be conducted to the lid portion 2 over almost the entire surface of the circuit board 61, the heat passage area can be increased, and the heat from the power supply circuit portion 6 can be sufficiently dissipated. . Since the heat conductive sheet 60 is interposed between the power supply circuit unit 6 and the lid 2, the heat from the power supply circuit unit 6 can be more sufficiently dissipated.

  The lighting device 200 according to the second embodiment is also assembled by the same procedure as that of the lighting device 100 according to the first embodiment. Since it includes many steps of integration by engaging or screwing with the hand of an operator without using a tool, workability and assembly are better than including many steps of integration by bonding and screwing. is there. In addition, most components can be assembled sequentially from the light emitting direction side (upper side in the drawing) of the light source module 3a, and workability and assemblability can be improved.

  In addition, in the illuminating device 200 which concerns on Embodiment 2, description of a leaf | plate spring is abbreviate | omitted. The leaf spring is appropriately set according to the ceiling to which the lighting device 200 is attached and the shape of the embedding hole or the attachment hole provided in the ceiling. As the leaf spring, a leaf spring having the same shape as the leaf spring 9 according to Embodiment 1 can be used.

  In the above embodiment, the engaging portion between the reflector 4 and the translucent plate 5 is provided inside the reflector 4, but the engaging portion may be configured as shown in FIG. FIG. 12 is a partially enlarged cross-sectional view of the lighting device.

  The reflecting cylinder 42 of the reflector 4 has a plurality of concave portions 42 formed by recessing a part of the reflecting cylinder 42 inward in the radial direction over a suitable length in the axial direction of the reflecting cylinder 42 (for example, in a circumferential direction). 3 places). A rectangular engagement hole 42 d is provided on the side of the flange 43 of the recess 42.

  On the other hand, an engaging claw 54 extending in the same direction as the peripheral wall 52 is provided on the peripheral wall 52 of the translucent plate 5 a so as to be aligned with the engaging hole 42 d of the reflecting tube 42. The translucent plate 5a is attached to the reflector 4 by pushing the translucent plate 42 into the reflecting tube 42 from the side of the engaging claw 54 and engaging the engaging claw 54 with the engaging hole 42d. Since the other configuration is the same as that of the first embodiment shown in FIG. 2, the same reference numerals as those in FIG. 2 are attached to the corresponding components, and detailed description of the configuration is omitted.

  With this configuration, the reflector 4 and the translucent plate 5 a can be more reliably engaged, and the engagement can be easily released by pushing the engaging claw 54 into the reflector 4. .

  In the above-described embodiment, heat conduction to the lid portion 2 is performed on the substantially entire surface of the circuit board 61 via the heat conductive sheet 60 at a position facing the lid portion 2 constituting the heat radiating member at an appropriate distance. Although the power supply circuit unit 6 is provided as possible, it is not limited to this. That is, the heat sink 1 is provided at a position separated from the light source module by an appropriate length so as to conduct heat to the heat radiating body at a position apart from the two heat sources such as the light source module and the power supply circuit unit 6. In addition, a power supply circuit unit may be provided so that either one of the cover unit 2 and the cover unit 2 can conduct heat. It is desirable that the power supply circuit unit is provided in a region opposite to the installation side of the light source module, that is, in a region opposite to the installation side of the light source module rather than in the middle of the cylindrical cavity of the heat dissipation unit.

  Moreover, in the above embodiment, although the heat radiator is comprised from the heat sink 1 and the cover part 2, the shape and the number of parts of a heat radiator are not limited to this, It has a cavity and a power supply circuit in a cavity What is necessary is just the structure which can accommodate a part.

  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.

  Furthermore, in the above embodiment, the description has been given by taking the embedded illumination device installed in the embedding hole provided in the ceiling such as the downlight, but the present invention is not limited to such an illumination device, and other types It is needless to say that the present invention can also be applied to a device including a heating device other than the lighting device and 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. Yes.

It is a typical external appearance exploded perspective view of the illuminating device which concerns on Embodiment 1 of this invention. It is a typical longitudinal cross-sectional view of an illuminating device. It is a typical perspective view of a heat sink. It is a typical bottom view of a heat sink. It is a typical perspective view of a reflector. It is a typical perspective view of an insulator. It is a typical perspective view of an insulator. It is a typical perspective view of an insulation nut. It is a typical perspective view of a leaf | plate spring. It is a typical top view of an illuminating device. It is a typical longitudinal cross-sectional view of the illuminating device which concerns on Embodiment 2 of this invention. It is a partial expanded sectional view of an illuminating device.

Explanation of symbols

1 Heat sink (bottomed cylinder, radiator)
2 Lid (heat radiator)
3,3a Light source module (light source)
32, 33, 36 LED (light source)
6 Power supply circuit part 61 Circuit board (board)
62 Electronic parts 60 Thermal conductive sheet

Claims (5)

  In a lighting device comprising a light source, a heat radiating body that dissipates heat from the light source, and a cavity, and a power supply circuit unit that is housed in the cavity of the heat radiating body and drives the light source, a part of the heat radiating body The light source is attached to the light source, and the power supply circuit portion is provided so as to be thermally conductive to the heat radiating member so as to be separated from the light source.   The heat dissipating body has a bottomed cylinder with the light source attached to the bottom surface thereof, and a lid for closing the bottomed cylinder, and the power supply circuit is capable of conducting heat to the lid. The lighting device according to claim 1, wherein a portion is provided.   3. The power supply circuit unit according to claim 2, wherein the power supply circuit unit includes a substrate on which an electronic component is mounted on one surface, and is provided on the other surface of the substrate so as to be able to conduct heat to the lid. The lighting device described.   The lighting device according to claim 2, wherein a heat conductive sheet is interposed between the power supply circuit unit and the lid unit.   The lighting device according to claim 1, wherein the light source is an LED.

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