JP2014212075A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device with improved heat radiation performance.SOLUTION: A lighting device includes: a circuit board 440; a point light source 441 provided on a lower surface of the circuit board 440; and a light guide member 41. The light guide member 41 is vertically long and has a front surface serving as a light emission part 412 and an upper end part serving as a light incident part 410 to which light emitted from the point light source 441 is introduced. The light guide member 41 reflects the light introduced from the light incident part 410 to the front side to be emitted from the light emission part 412. The lighting device further includes a heat radiation plate 46 ( a heat radiation part) provided along the circuit board 440 and thermally connected with the circuit board 440. At least a part of an upper surface of the heat radiation plate 46 serves as a heat radiation surface that is not shielded by the circuit board 440.

Description

  The present invention relates to a lighting device including a heat radiating unit.

  Patent Document 1 describes an illumination device. This lighting device includes a vertically long base member provided on a door of a mirror cabinet and an LED unit fixed along the front surface of the base member. The LED unit has a large number of LEDs arranged in a straight line in the vertical direction, and the front of the door can be illuminated by emitting the large number of LEDs. The base material is made of aluminum, and heat generated when the LED emits light is transmitted to the base material and dissipated.

JP2007-98034

  By the way, in the illuminating device described in Patent Document 1, the air heated by the heat radiation in the lower part of the base material is likely to rise. For this reason, in the upper part of the base material, it is difficult to dissipate heat due to the thermal influence of the warmed air, and as a result, heat is trapped at the location where the lighting device is defective or the lighting device is provided. There is a concern to do.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the illuminating device which can improve heat dissipation.

  In order to solve the above problems, an illumination device of the present invention includes a circuit board, a point light source provided on the lower surface of the circuit board, and a light guide member, and the light guide member is vertically long and the front surface emits light. And the upper end portion is a light incident portion into which light emitted from the point light source is introduced, the light introduced from the light incident portion is reflected forward and emitted from the light exit portion, and the circuit. A heat dissipating part provided along the substrate and thermally connected to the circuit board is further provided, and at least a part of the upper surface of the heat dissipating part is a heat dissipating surface that is not shielded by the circuit board. .

  Moreover, it is preferable that the said thermal radiation part is provided along the upper surface of the said circuit board.

  Moreover, it is preferable that the said thermal radiation part is extended in the horizontal direction outer side rather than the said circuit board.

  Moreover, it is preferable that the said thermal radiation part is formed in flat form.

  The point light source is preferably a light emitting diode.

  In the present invention, the air heated by the heat dissipated from the heat radiating surface facing the upper side of the heat radiating portion can be raised and separated from the heat radiating portion, thereby improving the heat dissipation of the heat radiating portion. can do.

It is a disassembled perspective view of the illuminating device and base of an example of embodiment of this invention. It is a front view of a bathroom vanity which comprises the illumination device same as the above. It is a horizontal sectional view of the cabinet of the same vanity table. It is the A section enlarged view of FIG. It is a perspective view which shows the state which has arrange | positioned the illuminating device to the cabinet main body. It is a principal part front view of the cabinet before attaching a door same as the above. It is BB 'sectional drawing of FIG. It is a perspective view of an illuminating device same as the above. It is a bottom view of the illuminating device attached to the base same as the above. The heat sink cover of an illuminating device same as the above is shown, (a) is a front view, (b) is a bottom view. It is the perspective view which showed a mode that the lighting apparatus same as the above was attached to a cabinet main body. It is explanatory drawing which shows the bathroom which provided the illuminating device of embodiment of another example.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. The illuminating device 4 of one Embodiment of this invention is provided in the cabinet 1, as FIG. 3 shows. The cabinet 1 is a mirror cabinet having a door 6 constituting the front surface as a mirror door. As shown in FIG. 2, the cabinet 1 is provided above the washstand 2, and the washstand 2 and the cabinet 1 constitute a washstand.

  The wash basin 2 is installed on the floor with the rear surface side along the wall of the room. A wash bowl (not shown) that opens upward is provided at the top of the wash basin 2. A rising wall 20 projecting upward is formed at the rear end of the upper surface of the washstand 2.

  As shown in FIG. 3, the cabinet 1 includes a cabinet body 3, a lighting device 4, and a door 6. The cabinet body 3 is made of, for example, a synthetic resin. The cabinet body 3 is fixed to the wall with the rear surface side along the wall of the room, and is disposed above the rising wall portion 20 of the washstand 2. The cabinet body 3 is disposed so as to protrude forward from the rising wall portion 20 of the washstand 2.

  The cabinet body 3 includes a ceiling portion 30 (see FIG. 11) constituting the upper surface, a bottom portion 31 constituting the lower surface, side wall portions 32 on both sides constituting the side surface, and a rear wall portion 33 constituting the rear surface.

  A plurality of storage spaces 34 opened forward are formed in the cabinet body 3. In the present embodiment, the storage spaces 34 are provided at a total of three locations on both sides and the center in the left-right direction of the cabinet body 3.

  Partition walls 35 projecting forward are formed on both sides of the portion between the side wall portions 32 in the rear wall portion 33 of the cabinet body 3. Each vertically long partition wall 35 extends from the ceiling 30 to the bottom 31.

  Hereinafter, the right side in FIG. 2 will be described as the right side. As shown in FIG. 3, the storage space 34 on the left side of the cabinet body 3 is a space surrounded by the left side wall portion 32, the left partition wall portion 35, the ceiling portion 30, and the bottom portion 31. The right storage space 34 is a space surrounded by the right side wall 32, the right partition wall 35, the ceiling 30, and the bottom 31. The central storage space 34 is a space surrounded by both partition wall portions 35, the ceiling portion 30, and the bottom portion 31. That is, in the cabinet body 3, the space surrounded by the ceiling portion 30, the bottom portion 31, the side wall portions 32 on both sides, and the rear wall portion 33 is partitioned by the vertically long partition wall portion 35, so that the inside becomes the storage space 34. A plurality of storage portions are formed.

  The illuminating device 4 is provided in the front part (front side) of the cabinet main body 3, as FIG. In this embodiment, the illuminating device 4 is provided in each partition wall part 35 which is a site | part between the storage spaces 34 located in a line with the cabinet 1 on either side.

  As shown in FIG. 4, each lighting device 4 is attached to the cabinet body 3 via a base 7 provided on the front surface of the partition wall portion 35. The base 7 is vertically long and has a cross-sectional shape that is formed in a groove shape that opens forward, and a back piece portion 71 that forms the groove back portion, and a side piece portion 70 that protrudes forward from both sides of the back piece portion 71. And have. A storage groove 72 is formed in the base 7 so as to be opened forward and downward by both side piece portions 70 and a back piece portion 71.

  As shown in FIG. 11, a recessed portion 37 that is recessed downward is formed at a location corresponding to each partition wall portion 35 on the upper surface of the ceiling portion 30 of the cabinet body 3. In other words, on the upper surface of the ceiling portion 30, portions other than the concave portion 37 are protruding portions that protrude upward from the bottom surface of the concave portion 37. The recess 37 is formed in a rectangular shape that is long in the front-rear direction in plan view, and opens upward and forward.

  As shown in FIG. 4 and FIG. 11, a fitting groove portion 36 penetrating vertically is formed on the front surface of a location corresponding to each partition wall portion 35 in the ceiling portion 30 and the bottom portion 31 of the cabinet body 3. As shown in FIG. 11, the fitting groove portion 36 of the ceiling portion 30 is formed in a portion constituting one side end portion of the front end portion of the bottom surface of each concave portion 37 and opens upward from the bottom surface of the concave portion 37. ing. Each fitting groove 36 of the bottom 31 shown in FIG. 4 opens downward from the lower surface of the bottom 31.

  The back piece 71 of the base 7 is disposed along the front surface of the partition wall 35. As shown in FIG. 11, the upper end portion of the base 7 is fitted into the fitting groove portion 36 of the ceiling portion 30 of the cabinet body 3, and the storage groove 72 of the base 7 opens upward from the bottom surface of the concave portion 37. Yes. As shown in FIG. 4, the lower end portion of the base 7 is fitted into the fitting groove portion 36 of the bottom portion 31 of the cabinet body 3, and the storage groove 72 of the base 7 is opened below the lower surface of the bottom portion 31. .

  The back piece 71 of the base 7 is screwed to the partition wall 35 from the front. Thereby, the partition wall part 35 which is a part between the storage spaces 34 arranged side by side in the cabinet body 3 is provided with a storage groove 72 opened forward.

  The lighting device 4 includes a holder 40, a light guide member 41, a lower cap 42, an upper cap 43, a light source block 44, a heat radiating sheet 45, a heat radiating plate 46, and a surface cover, as shown in FIGS. 47 and a heat sink cover 48. Among these, the heat radiating plate 46 constitutes a heat radiating portion that radiates heat generated by the light source block 44, and the heat radiating plate cover 48 constitutes a heat radiating portion cover that covers the heat radiating plate 46.

  As shown in FIG. 1, the holder 40 is a vertically long member, and the vertical length thereof is substantially the same as that of the base 7. In the holder 40, a holding groove 400 that opens forward is formed on the top and bottom.

  The light guide member 41 is formed in a vertically long bar shape and has substantially the same length as the holder 40. The light guide member 41 is formed using, for example, a transparent resin such as an acrylic resin or a polycarbonate resin, and has translucency. As shown in FIG. 4, the light guide member 41 is fitted in the holding groove 400 of the holder 40 and is held by the holder 40.

  The upper end surface (see FIG. 1) of the light guide member 41 is exposed above the holder 40. The upper end surface of the light guide member 41 constitutes a light incident part 410 into which light emitted from a point light source 441 included in the light source block 44 enters.

  As shown in FIG. 4, a reflective portion 411 is provided on the rear surface of the light guide member 41. The reflection part 411 is formed by, for example, providing a reflective substance on the rear surface of the light guide member 41 by printing or vapor deposition, providing fine irregularities, or providing a reflective part by two-color molding. Light that has entered the light guide member 41 from the light incident portion 410 is diffused in the reflection portion 411 and reflected to the front side in the process of traveling downward in the light guide member 41.

  The front surface of the light guide member 41 constitutes a light output portion 412 that emits light reflected by the reflection portion 411 to the front side. The light exit part 412 is exposed in front of the holder 40.

  The lower cap 42 shown in FIG. 9 is disposed along the lower end surface of the holder 40. The lower cap 42 is attached to the lower end portion of the holder 40 by screwing. The lower cap 42 is located immediately below the light guide member 41 held by the holder 40 and restricts the downward movement of the light guide member 41.

  The upper cap 43 shown in FIG. 1 is fitted so as to cover the upper end portion of the holder 40. The upper cap 43 is located immediately above the light guide member 41 held by the holder 40 and restricts the upward movement of the light guide member 41.

  In the upper cap 43, a window portion 430 formed of a hole or notch penetrating vertically is formed at a location facing the light incident portion 410 of the light guide member 41. A circuit board 440 included in the light source block 44 is placed on the upper cap 43 with one surface thereof facing downward, and a part of the lower surface of the circuit board 440 faces the window 430.

  A point light source 441 is provided on the circuit board 440. The point light source 441 is a light emitting diode (LED), and is mounted on the lower surface of the circuit board 440 facing the window 430 in a direction in which light is irradiated downward. The point light source 441 is disposed in the window portion 430 of the upper cap 43 and faces the light incident portion 410 of the light guide member 41. The point light source 441 and the circuit board 440 constitute a light source block 44 of the illumination device 4. Note that only one point light source 441 of this embodiment is provided on the circuit board 440 in order to suppress the amount of heat generated by the light source block 44, but a plurality of point light sources 441 may be provided.

  A heat dissipation sheet 45 is laminated on the upper surface of the circuit board 440. For example, it is made of a material having excellent thermal conductivity such as silicone. The heat radiation sheet 45 is formed in the same shape as the circuit board 440 in plan view, and the whole overlaps with the whole circuit board 440.

  The heat radiating plate 46 is made of a material having excellent heat radiating properties, for example, a metal such as aluminum, iron, or copper. The heat radiating plate 46 is formed in a substantially rectangular flat plate shape that is long in the front-rear direction, and is disposed above the circuit board 440 with its plate surface facing downward.

  One side end portion of the front end portion of the heat radiating plate 46 is a protruding portion 460 protruding forward. In the corner portion of the heat sink 46 in a substantially rectangular shape in plan view, the front portion including the protrusion 460 is a sandwiching portion 461 and the rear portion of the sandwiching portion 461 is a mounting portion 462. Yes.

  The mounting portion 462 of the heat sink 46 is directly placed on the upper cap 43. A plurality of screws 50 as fixing tools are inserted into the mounting portion 462 from above, and these screws 50 are screwed into the holder 40 through the upper cap 43. Thereby, the heat sink 46 is attached to the holder 40. Further, the upper cap 43 is fixed by being sandwiched between the holder 40 and an attachment portion 462 attached thereto with screws 50.

  The heat radiating plate 46 is horizontally disposed along the upper surface, which is one plate surface of the circuit board 440. Specifically, in the heat radiating plate 46, the sandwiching portion 461 is disposed along the upper surface of the heat radiating sheet 45 on the circuit board 440.

  The heat radiating plate 46 has an area larger than that of the light guide member 41 and the circuit board 440 in plan view, and a portion excluding the sandwiching portion 461 protrudes outside the circuit board 440 in plan view. That is, the heat sink 46 is spread outward in the horizontal direction from the circuit board 440.

  The sandwiching portion 461 of the heat radiating plate 46 is disposed on the circuit board 440 via the heat radiating sheet 45. The circuit board 440 and the heat radiating sheet 45 are sandwiched vertically by the sandwiching portion 461 and the upper cap 43. Thereby, the heat radiating plate 46 is thermally connected to the circuit board 440 which becomes the heat generating portion of the light source block 44 through the heat radiating sheet 45. The heat sink 46 may be directly joined to the circuit board 440 as long as it is thermally connected while maintaining an electrical insulation state with the circuit board 440, or a member other than the heat sink sheet 45 may be used. It may be connected to the circuit board 440 via.

  The upper surface, which is one plate surface of the heat radiating plate 46, is a heat radiating surface that is not entirely shielded by the circuit board 440. Further, on the lower surface, which is the other plate surface of the heat radiating plate 46, a portion that is not shielded by the circuit board 440 is also a heat radiating surface.

  As the point light source 441 of the light source block 44 emits light, the point light source 441 and the circuit board 440 on which the point light source 441 is mounted generate heat. Thus, the heat generated in the light source block 44 is transmitted to the heat radiating plate 46 via the heat radiating sheet 45 and is dissipated from the heat radiating plate 46.

  The front cover 47 is vertically long, and the length thereof is substantially the same as that of the holder 40 and the light guide member 41. As shown in FIG. 4, the surface cover 47 is formed in a groove shape whose cross-sectional shape opens rearward, and the front piece portion 470 constituting the front surface and the hook projecting rearward from both sides of the front piece portion 470. A stop piece 471 is provided.

  The front cover 47 is attached to the holder 40 so as to cover the front surface of the light guide member 41 by hooking both hooking pieces 471 on the front part of the holder 40. The front cover 47 has translucency, and light emitted from the light output part 412 of the light guide member 41 is emitted to the front side of the cabinet body 3 through the front piece part 470 of the front cover 47. Yes.

  The heat sink cover 48 shown in FIGS. 1 and 10 is formed of a material such as a synthetic resin having a lower thermal conductivity than the heat sink 46, for example. The heat radiating plate cover 48 is formed in a box shape that opens downward in a substantially rectangular shape that is long in the front-rear direction in plan view. The heat sink cover 48 is substantially the same size and shape as the recess 37 formed on the upper surface of the cabinet body 3 in plan view.

  As shown in FIG. 10, the heat sink cover 48 includes a top surface portion 480, a front surface portion 481 that protrudes downward from the front edge portion of the top surface portion 480, a rear surface portion 482 that protrudes downward from the rear edge portion of the top surface portion 480, And a side surface portion 483 projecting downward from the edge portions on both sides of the top surface portion 480.

  The heat radiating plate cover 48 is formed with a recess 485 formed by a top surface portion 480, a front surface portion 481, a rear surface portion 482, and both side surface portions 483 and opening downward. As shown in FIG. 7, the heat radiating plate cover 48 is fitted over the heat radiating plate 46, and substantially all of the heat radiating plate 46 is accommodated in the recess 485. In addition, although the heat sink 46 of the example of illustration protrudes slightly downward from the recess 485 only in the lower end part, the whole may be accommodated in the recess 485.

  As shown in FIG. 10, in the front surface portion 481 of the heat sink plate 48, the side end portion corresponding to the protrusion portion 460 of the heat sink plate 46 is a groove shape whose horizontal cross-sectional shape opens rearward and protrudes forward. It is a music part 484. The projecting portion 460 of the heat radiating plate 46 (see FIG. 1) is accommodated in the projecting portion 484.

  A hooking portion 486 projecting downward is formed on the front and rear of the lower edge of each side surface portion 483 of the heat radiating plate cover 48. A claw portion 487 that protrudes inward (inward in the left-right direction) of the heat radiating plate cover 48 is formed at the lower portion of each latching portion 486. As shown in FIG. 6, the claw portion 487 of each latching portion 486 of the heat radiating plate cover 48 is hooked on the lower surface of the corresponding side edge portion of the heat radiating plate 46. Thus, the heat sink cover 48 is attached to the heat sink 46.

  As shown in FIG. 4, the holder 40 of the lighting device 4 is fitted in the storage groove 72 of the base 7. On both sides of the rear surface of the holder 40, hooking piece portions 401 protruding rearward are formed. Each hook piece 401 is hooked on a protrusion 73 formed on the corresponding side piece 70 of the base 7. Thereby, the forward movement of the holder 40 is restricted. Each side piece 70 of the base 7 is inserted with a screw 51 (see FIG. 5) as a fixing tool from the outside, and each screw 51 is screwed into the holder 40. Accordingly, the holder 40 is attached to the base 7.

  As shown in FIG. 4, the illuminating device 4 attached to the cabinet body 3 is configured so that the front part of the holder 40 and most of the light guide member 41 arranged here are on the front surface of the ceiling part 30 of the cabinet body 3. And the front portion of the bottom portion 31 is disposed in front of the front portion.

  As shown in FIG. 5, the heat sink cover 48 of the lighting device 4 is fitted in the recess 37 of the cabinet body 3, and the heat sink cover 48 and the heat sink 46 are disposed in the recess 37.

  The radiator plate 48 is housed in the recess 37 except for the protruding portion 484 protruding forward, and the radiator plate 46 is housed in the recess 37 except for the projection 460. That is, substantially all of the heat sink cover 48 and the heat sink 46 are accommodated in the recess 37.

  As shown in FIG. 1, the top surface portion 480 of the heat radiating plate cover 48 is formed with a plurality of concave groove portions 489 that are long and recessed downward in the left-right direction. A communication hole 488 penetrating vertically is formed at the bottom of each concave groove 489. Each communication hole 488 is a slit-like hole that is provided on the left and right along the rear edge of the bottom of the groove 489. Each communication hole 488 is located above the heat radiating plate 46, and heat generated in the heat radiating plate 46 is discharged to the upper side of the heat radiating plate cover 48 through each communication hole 488.

  As shown in FIG. 5, the upper surface of the heat radiating plate cover 48 is slightly lower than the upper surface of the cabinet body 3 other than the concave portion 37 of the ceiling portion 30, or substantially the same as the upper surface of the ceiling portion 30 other than the concave portion 37. It is the same. For this reason, the heat sink cover 48 does not protrude upward from the upper surface of the cabinet body 3.

  The front surface portion 481 excluding the protruding portion 460 of the heat radiating plate cover 48 is located slightly rearward of the front surface of the ceiling portion 30 or is flush with the front surface of the ceiling portion 30.

  As shown in FIG. 7, the lower end of each latching portion 486 (the lower end of the claw portion 487) of the radiator plate 48 that is latched on the lower surface of the radiator plate 46 is a recess that becomes a part of the upper surface of the ceiling portion 30. It is in contact with the bottom surface of 37 or is disposed in the vicinity of the bottom surface of the recess 37. As a result, a space 12 (gap) is formed between the lower surface of the heat radiating plate 46 and the bottom surface of the concave portion 37.

  As shown in FIG. 6, an opening 10 is formed between the front surface portion 481 excluding the protruding portion 460 of the heat radiating plate cover 48 and the front edge portion of the bottom surface of the concave portion 37. The space 12 immediately below the heat radiating plate 46 is open to the outside of the cabinet body 3 through the opening 10 and communicates with the front of the cabinet body 3. For this reason, the heat generated in the heat radiating plate 46 is discharged from the space 12 to the outside of the cabinet body 3 through the opening 10.

  As shown in FIG. 4, in the storage groove 72 formed by the back piece 71 and the both side pieces 70 of the base 7, a ventilation path 54 is provided behind the light guide member 41 disposed in the storage groove 72. Is formed. The air passage 54 is a space surrounded by the inner surface of the storage groove 72 and the rear surface of the holder 40 and is vertically long. The ventilation path 54 is formed over substantially the entire length of the storage groove 72 in the vertical direction.

  As shown in FIG. 4 and FIG. 9, the lower cap 42 provided at the lower end of the holder 40 is positioned forward of the back piece 71 of the base 7 via the gap 53. A lower end portion of the air passage 54 is opened downward from the gap 53 to the outside of the cabinet body 3 and communicates with the lower portion of the cabinet body 3. For this reason, air existing outside the cabinet body 3 is introduced into the air passage 54 from the gap 53. That is, the gap 53 serves as an intake port for taking air outside the cabinet body 3 into the air passage 54.

  As shown in FIG. 7, the rear portion of the upper cap 43 disposed on the holder 40 is located above the upper end surface of the holder 40 via the gap 52. The upper end portion of the air passage 54 communicates with the space 12 directly below the heat radiating plate 46 through the gap 52. For this reason, the air existing in the air passage 54 is introduced into the space 12 through the gap 52 after being raised through the air passage 54, and then led out to the front of the cabinet body 3 from the space 12 through the opening 10. It has become so.

  As shown in FIG. 2, each door 6 provided on the front surface of the cabinet body 3 is a mirror door whose front surface is a mirror surface. Each door 6 is provided for each storage space 34 of the cabinet body 3 as shown in FIG. 3.

  The upper end and the lower end of one side end that is the suspending source of each door 6 are attached to the front surface of the ceiling portion 30 and the front surface of the bottom portion 31 of the cabinet body 3 via hinges 11, respectively. As a result, each door 6 is rotatable to the left and right from a position where the corresponding storage space 34 is closed to a position where the front of the storage space 34 is opened. The three doors 6 provided in the cabinet body 3 can be used as a three-sided mirror by turning the left and right doors 6 forward while the central door 6 of the cabinet 1 is closed.

  Each lighting device 4 provided in the cabinet 1 emits light from the light guide member 41 to the front side of the cabinet 1 by causing the point light source 441 to emit light. That is, the light emitted from the point light source 441 is introduced into the light guide member 41 from the light incident portion 410 that is the upper end surface of the light guide member 41, and then reflected in the process toward the lower end side of the light guide member 41. The light is diffused at 411 and reflected to the front side. This light is emitted to the front side from the light exit part 412, and is irradiated to the front side of the cabinet 1 through the front piece part 470 of the surface cover 47 located between the adjacent doors 6. Thereby, the user who uses the mirror surface provided on the front surface of the door 6 can perform makeup, washing, and the like using the light emitted from the light exit unit 412.

  Further, when the point light source 441 of the illumination device 4 is caused to emit light in this way, the light emitting diode and the circuit board 440 provided with the light emitting diode generate heat. This heat is transmitted to the heat radiating plate 46 provided on the upper surface which is the outer surface of the cabinet body 3 via the heat radiating sheet 45, and is radiated in the heat radiating plate 46.

  The illuminating device 4 of the present embodiment includes a circuit board 440, a point light source 441 provided on the lower surface of the circuit board 440, and a light guide member 41. The light guide member 41 is vertically long and the front surface emits light. A light incident portion 410 into which light emitted from the point light source 441 is introduced, and the light introduced from the light incident portion 410 is reflected forward and emitted from the light exit portion 412 A heat dissipating part provided along the circuit board 440 and thermally connected to the circuit board 440, wherein at least a part of the upper surface of the heat dissipating part is not shielded by the circuit board 440. It is characterized by that. For this reason, the light emitted from the point light source 441 can be emitted to the front side of the light guide member 41 to illuminate the front of the light guide member 41 by causing the point light source 441 to emit light. Further, when the point light source 441 emits light, the heat generated in the point light source 441 and the circuit board 440 can be transmitted to the heat radiating portion and dissipated. Moreover, the air heated by the heat dissipated from the heat radiating surface facing the upper side of the heat radiating portion can be raised and separated from the heat radiating portion, and the heat radiating property of the heat radiating portion can be improved. Thereby, it becomes difficult to produce a malfunction in an illuminating device by the heat | fever generate | occur | produced at the time of light emission of the point light source 441, and it can make it difficult to heat up the location in which the illuminating device 4 was provided.

  In the illumination device 4, it is preferable that the heat dissipating part is provided along the upper surface of the circuit board 440. By doing in this way, the whole upper surface of a thermal radiation part can be used as a thermal radiation surface, and heat dissipation can be improved further.

  In addition, it is preferable that the heat dissipating part is spread outward in the horizontal direction from the circuit board 440. By doing in this way, the thermal radiation surface of a thermal radiation part can be enlarged and heat dissipation can be improved further.

  Moreover, it is preferable that the said thermal radiation part is formed in flat form. By doing in this way, the area of a thermal radiation surface can be ensured large, suppressing the enlargement of a thermal radiation part.

  The point light source 441 is preferably a light emitting diode. By doing in this way, the heat which generate | occur | produced at the time of light emission of a light emitting diode can be dissipated in a thermal radiation part.

  In this embodiment, the entire upper surface of the heat radiating portion is a heat radiating surface that is not shielded by the circuit board 440. For example, the heat radiating portion is provided along the lower surface of the circuit board 440, and only a part of the upper surface of the heat radiating portion is provided. A heat dissipation surface that is not shielded by the circuit board 440 may be used. That is, at least a part of the upper surface of the heat dissipation portion may be a heat dissipation surface that is not shielded by the circuit board 440. In addition, the heat radiating portion of the present embodiment is expanded outward in the horizontal direction from the circuit board 440. For example, the heat radiating portion provided along the upper surface of the circuit board 440 is more than the circuit board 440 in plan view. You may make it not protrude outside. Moreover, although the heat radiating portion of the present embodiment is a flat heat radiating plate 46, the shape of the heat radiating portion may be other shapes such as a block shape. Moreover, although the point light source 441 of this embodiment is a light emitting diode, other light sources, such as a light bulb, may be sufficient. Further, the heat sink cover 48 may be omitted.

  Moreover, although this embodiment demonstrated the example which provided the illuminating device 4 in the cabinet 1, the location in which the illuminating device 4 is provided is not restricted to the cabinet 1, For example, you may provide in a bathroom as FIG. 12 shows. . In the example of FIG. 12, a portion below the heat radiating plate 46 of the lighting device 4 is provided at the corner of the bathroom, and the light emitted to the front side of the light guide member 41 when the point light source 441 emits light is generated in the bathroom. Can be illuminated. The heat radiating plate 46 is disposed behind the ceiling of the bathroom, and heat generated by the point light source 441 and the circuit board 440 is dissipated outside the bathroom when the point light source 441 emits light. In addition, since the basic structure of the illuminating device 4 in the example of FIG. 12 is the same as the illuminating device 4 shown by FIG. 1, detailed description is abbreviate | omitted. In addition, various modifications can be made according to the design and the like as long as they do not depart from the present invention.

41 Light guide member 46 Heat radiating plate (heat radiating part)
410 light incident part 412 light outgoing part 440 circuit board 441 point light source

Claims (5)

A circuit board;
A point light source provided on the lower surface of the circuit board;
A light guide member,
The light guide member is vertically long, the front surface becomes a light emitting portion, and the upper end portion becomes a light incident portion into which light emitted from the point light source is introduced, and reflects light introduced from the light incident portion to the front side. Emanating from the light exiting part,
A heat dissipating part provided along the circuit board and thermally connected to the circuit board is further provided, and at least a part of the upper surface of the heat dissipating part is a heat dissipating surface that is not shielded by the circuit board. A lighting device.   The lighting device according to claim 1, wherein the heat radiating portion is provided along an upper surface of the circuit board.   The lighting device according to claim 1, wherein the heat dissipating part is expanded outward in the horizontal direction from the circuit board.   The lighting device according to claim 1, wherein the heat radiating portion is formed in a flat plate shape.   The lighting device according to any one of claims 1 to 4, wherein the point light source is a light emitting diode.

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