JP2010080244A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of efficiently radiating heat generated in a heating component mounted to a circuit board while preventing foreign matter from intruding into a luminaire body. <P>SOLUTION: The luminaire includes: the circuit board 1 of rectangular plate shape, mounted with a switching element 21 on one surface side in the thickness direction, the switching element 21 being the heating component constituting a portion of a lighting circuit for lighting a plurality of LEDs 6 (a light source); and the luminaire body 30 substantially sealed with the circuit board 1 enclosed inside. The luminaire is used so that one direction orthogonal to the thickness direction of the circuit board 1 is a vertical direction, and the circuit board 1 is provided with two ventilating parts 41, 42 on the upper side and lower side with respect to the mounted position of the switching element 21 to allow ventilation in the thickness direction of the circuit board 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting fixture.

  Conventionally, as shown in FIG. 6, a light source (not shown) composed of a discharge lamp and a transformer 22 ′, a switching element 21 ′, etc., which are circuit components of a lighting circuit composed of an inverter circuit for lighting the light source, are mounted. Circuit board 1 'and instrument body 30' in which circuit board 1 'is housed, and instrument body 30' is slidably attached to wiring duct 32 'disposed on the lower surface side of ceiling material C1. In addition, there has been proposed a lighting fixture in which a lamp (not shown) containing a light source therein is attached to the lower surface side of the fixture body 30 'by an arm 31' (see Patent Document 1). Here, the instrument main body 30 ′ is formed of a circuit board storage case main body 3a ′ formed in a rectangular parallelepiped box shape whose upper surface is opened, and a metal fitted on the upper surface of the circuit board storage case main body 3a ′. Since the switching element 21 ′ is in contact with the lid 3b ′, the switching element 21 ′ generates heat due to power loss during the switching operation, but the switching element 21 ′ The generated heat can be dissipated through the lid 3b ′.

  However, in the luminaire shown in FIG. 6, since it is necessary to electrically insulate the switching element 21 ′ and the lid 3b ′ formed of metal, a heat is generated between the switching element 21 ′ and the lid 3b ′. Since it is necessary to provide an insulating member (not shown) with good conductivity, the structure becomes complicated, the number of parts increases, and the cost increases.

On the other hand, conventionally, as shown in FIG. 7, a circuit board 1 ″ mounted with a regulator 23 ″ as a heat generating component and a circuit board storage case 3 ″ for storing the circuit board 1 ″ are provided. 1 ″ is provided with a plurality of vent holes 1a ″. The circuit board storage case 3 ″ has a first heat radiation hole 31c ″ through which air flows from the lower surface side of the circuit board storage case 3 ″, and a regulator 21. The second heat radiating hole 32c "for releasing the heat generated in" to the outside is provided so as to generate an air flow (arrow in FIG. 7) inside the circuit board storage case 3 ". A heat dissipating structure for electronic devices has been proposed (see Patent Document 2).
JP-A-6-215612 JP 2000-31675 A

  However, in the heat dissipation structure having the configuration shown in FIG. 7, air outside the circuit board storage case 3 ″ flows into the circuit board storage case 3 ″. Foreign matter such as dust flows into the circuit board storage case 3 ″ together with air, and the foreign matter may adhere to the circuit board 1 ″, which may cause malfunction. On the other hand, the circuit board storage case 3 ″ If the structure is hermetically sealed to prevent the air from flowing into the circuit board storage case 3 ″, the heat dissipation performance is deteriorated.

  The present invention has been made in view of the above-mentioned reasons, and its purpose is to prevent entry of foreign matters such as dust into the inside of the instrument body housing the circuit board. An object of the present invention is to provide a lighting apparatus that can efficiently dissipate heat generated by a heat-generating component mounted on the housing.

  In order to achieve the above object, the invention according to claim 1 is a circuit board in which a heat generating component constituting a part of a lighting circuit for lighting a light source is mounted on one surface side in the thickness direction, and the circuit board is on the inside Is a lighting fixture that is disposed and used so that one direction perpendicular to the thickness direction of the circuit board is the vertical direction, and the circuit board includes a heat generating component. A ventilation portion that allows ventilation in the thickness direction of the circuit board is provided at least on the upper side and the lower side in the vertical direction with respect to the position where is mounted.

  According to this invention, since the density of the air existing on the one surface side of the circuit board is different between the upper side and the lower side with respect to the position where the heat generating component is mounted in use, the heat generating component is mounted in use. The circuit board is provided with at least two ventilation portions located on the upper side and the lower side in the up-down direction with respect to the formed position, so that air is supplied to the one surface side and the other surface side of the circuit board. Since the heat generated by the heat-generating component is efficiently radiated by convection, heat dissipation can be improved as compared with the case where the ventilation portion is not provided on the circuit board. In addition, since sufficient heat dissipation can be obtained without bringing the heat generating component into contact with the appliance main body via an insulating member or the like, the cost can be reduced by simplifying the structure and reducing the number of components. In addition, since the instrument body is substantially sealed, foreign matter such as dust can be prevented from entering the interior of the instrument body, so that foreign substances such as dust adhere to the lighting circuit formed on the circuit board. It is possible to prevent malfunction due to the above.

  A second aspect of the invention is characterized in that, in the first aspect of the invention, the heat generating component is mounted on the circuit board below the center of the circuit board in the vertical direction.

  According to this invention, in use, the heat radiated above the position where the heat generating component is mounted inside the instrument main body, and the air descending below the instrument main body can be brought into contact with the heat generating component. Therefore, the heat generated in the heat generating component can be radiated more efficiently.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the ventilation portion is provided on both sides of the circuit board in a direction perpendicular to the vertical direction with respect to a position where the heat generating component is mounted. It is characterized by being made.

  According to this invention, not only when the one direction is used as the vertical direction, but also when the direction perpendicular to the one direction and perpendicular to the thickness direction of the circuit board is used as the vertical direction, the heat generating component The heat generated in can be efficiently radiated.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the circuit board includes a plane including the one surface of the circuit board housed inside the instrument body. Is set to be substantially equal to the area of the opening in the cross section of the portion of the instrument body in which the circuit board is accommodated.

  According to this invention, in order to form the space | gap which enables ventilation | gas_flowing to the thickness direction of the said circuit board between the peripheral part of the said circuit board and the said instrument main body, the said accommodated inside the said instrument main body The size of the instrument body is increased so that the area of the opening portion of the cross section of the part in which the circuit board is accommodated in the instrument body by a plane including the one surface of the circuit board is larger than the area of the circuit board. Therefore, it is possible to reduce the size of the instrument body while sufficiently dissipating the heat generated by the heat-generating component. Moreover, since the distance between the heat generating component and the device main body can be reduced by downsizing the device main body, the heat generated by the heat generating component can be efficiently radiated.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the ventilation portion includes a portion surrounded by a notch formed at an end portion of the circuit board and an inner surface of the instrument body. It is characterized by.

  According to this invention, since the area of the circuit board can be reduced, the instrument body can be downsized.

  According to the first aspect of the present invention, since the instrument body is substantially sealed, foreign matter such as dust can be prevented from entering the interior of the instrument body. The circuit board includes at least two ventilation portions that are located on the upper side and the lower side in the vertical direction with respect to the position where the heat generating component is mounted during use. Because the heat generated in the heat generating component is efficiently radiated by convection of air between the one surface side and the other surface side of the circuit board, the heat generated by the heat generating component can be efficiently dissipated. Can do. Further, since the structure can be simplified and sufficient heat dissipation can be obtained while reducing the number of parts, the cost can be reduced.

(Embodiment 1)
Hereinafter, the present embodiment will be described with reference to FIGS. 1 to 3.

  In the lighting fixture of the present embodiment, circuit components (such as a switching element 21 and a transformer 22 described later) of a lighting circuit for lighting a plurality of (four in the illustrated example) white LEDs as light sources are turned on in the thickness direction. Circuit board 1 mounted on one surface side, circuit board storage case 3 in which circuit board 1 is stored inside, and light source storage case 5 in which LED 6 is stored inside. The light source storage case 5 constitutes the instrument body 30. Here, in the instrument main body 30, the circuit board storage case 3 is formed in a bottomed cylindrical shape (here, a bottomed cylindrical shape), and an open portion of the circuit board storage case 3 is closed by the light source storage case 5. It is almost sealed. In addition, LED6 is not limited to white LED, For example, you may use blue LED etc.

  The circuit board 1 is formed, for example, by providing an appropriate circuit pattern on a rectangular plate-like insulating base made of an insulating material such as glass epoxy, and the circuit components of the lighting circuit are mounted thereon. The lighting circuit includes a rectifier (not shown) that rectifies an output from a commercial power source (not shown) and a smoothing capacitor (not shown) that is connected between the output terminals of the rectifier and smoothes the output from the rectifier. A switching element 21 composed of a MOSFET inserted between the other end of the series circuit of the plurality of LEDs 6 whose one end is connected to the secondary side winding of the transformer 22 and the transformer 22; And a control unit (not shown) for on / off control. Here, a series circuit of a plurality of LEDs 6 is mounted on an LED mounting substrate 11 described later. Further, since the switching element 21 repeats the on / off switching operation at about 50 kHz according to the control signal from the control unit, the switching element 21 generates heat due to the power loss generated at each switching operation. In short, in the present embodiment, the switching element 21 constitutes a heat generating component.

  Here, notches 41 a and 42 a are formed at both ends in the longitudinal direction of the circuit board 1, and a portion surrounded by the notches 41 a and 42 a and the inner surface of the circuit board storage case 3 is a ventilation part 41, 42 is formed. That is, the ventilation portions 41 and 42 are provided on the upper and lower sides in the vertical direction with respect to the position where the switching element 21 is mounted on the circuit board 1.

  The circuit board storage case 3 is made of a heat conductive material (for example, aluminum), and a pair of ribs 3a project from the inner peripheral surface at positions corresponding to both ends of the circuit board 1 in the short direction. Has been. Here, the circuit board 1 has an opening in a cross section of the instrument main body 30 by a plane whose area including the ventilation portions 41 and 42 includes the one surface of the circuit board 1 accommodated inside the circuit board storage case 3 of the instrument main body 30. The area is set to be equal to the area of the portion (the opening in the cross section of the circuit board storage case 3). And the circuit board 1 is arrange | positioned inside the circuit board storage case 3 in the form by which the both ends of the transversal direction were inserted between each one pair of ribs 3a. Further, the circuit board storage case 3 has no air holes or the like for actively taking in or discharging outside air, and the open portion is closed by the light source storage case 5 so as to be substantially sealed. Is prevented from entering the inside of the circuit board storage case 3, so that it is possible to prevent malfunction caused by foreign matters such as dust adhering to the lighting circuit formed on the circuit board 1. An electric wire insertion hole (not shown) for inserting an electric wire (not shown) connecting the commercial power source and the rectifier is formed at the bottom of the circuit board storage case 3. In the present embodiment, the example in which the rib 3a is provided on the inner peripheral surface of the circuit board storage case 3 has been described. However, instead of providing the rib 3a, a substrate mounting groove (not shown) is provided on the inner peripheral surface of the circuit board storage case 3. ) And both ends in the short direction of the circuit board 1 may be disposed inside the circuit board storage case 3 in a form of being fitted between each pair of ribs 3a.

  Similarly to the circuit board storage case 3, the light source storage case 5 is also made of a heat conductive material (for example, aluminum), and has a recess 5a having a circular shape in plan view on one surface side (the lower surface side in FIG. 1). At the bottom of the recess 5a of the light source storage case 5, a recess 5b for storing the LED mounting substrate 11 on which the plurality of LEDs 6 are mounted is formed. Here, the depth dimension of the recess 5b is set to be approximately the same as the thickness dimension of the LED mounting substrate 11. Further, inside the recess 5 a of the light source storage case 5, a reflective member 12 that reflects light from the LED 6 and a translucent property that protects the LED 6 that is mounted on the opposite side of the reflective member 12 from the LED mounting substrate 11. A cover 13 is provided. Furthermore, a screw insertion hole 5c through which a mounting screw 14 (to be described later) is inserted is formed at the center of the bottom of the recess 5b of the light source storage case 5. The lighting circuit and the series circuit of the plurality of LEDs 6 are electrically connected by a lead wire or the like (not shown), and the lighting circuit is formed at the bottom of the concave portion 5 b of the light source housing 5. A wiring insertion hole (not shown) through which a lead wire or the like led out from the circuit board 1 and connected to the LED 6 mounted on the LED mounting board 11 is led out. Further, the outer diameter dimension of the light source storage case 5 of the instrument body 30 is larger than the outer diameter dimension of the circuit board storage case 3, and the circuit board storage case 3 is installed in a ceiling material (not shown). It is inserted into a hole (not shown) and attached to the ceiling material such that the outer peripheral portion of the light source storage case 5 is in contact with the lower surface of the peripheral portion of the mounting hole in the ceiling material.

  The LED mounting substrate 11 is made of an insulating material such as glass epoxy and is formed in a circular plate shape, and a screw insertion hole 11c through which a mounting screw 14 (to be described later) is inserted is formed in the center.

  The reflecting member 12 is made of, for example, a surface of the base material that has been subjected to silver plating having a high reflectance, and has an outer peripheral shape that is substantially the same circular shape as the inner peripheral shape of the recess 5a in plan view. In addition, four openings 12a are formed in the reflecting member 12 at regular intervals in the circumferential direction, and four LEDs 6 are arranged inside each opening 12a. Each opening 12a of the reflecting member 12a has a paraboloid inner surface, and reflects light emitted from the LED 6 toward the inner surface of the opening 12a to the front of the LED 6. To do. Further, a screw insertion hole 12c through which a mounting screw 14 described later is inserted is formed in the central portion of the reflection member 12.

  The translucent cover 13 is made of a translucent material such as acrylic, and is formed in a circular plate shape having substantially the same outer size as the opening size of the recess 5a. Therefore, the translucent cover 13 is fitted between the outer peripheral edge and the inner peripheral edge of the recess 5a. In addition, a screw insertion hole 13 c into which a mounting screw 14 described later is inserted is formed in the central portion of the translucent cover 13. In addition, the translucent cover 13 is not limited to a circular plate shape, For example, the lens for light distribution control (for example, Fresnel lens etc.) may be integrally formed. Moreover, if LED6 consists of blue LED, you may use as the translucent cover 13 what disperse | distributed the fluorescent substance excited by the blue light from blue LED and radiating | emitting yellow light.

  The translucent cover 13, the reflecting member 12, and the LED mounting substrate 11 are fixed to the light source storage case 5 by the above-described mounting screw 14 and a nut 15 that is screwed to the tip of the mounting screw 14. The assembly procedure of the instrument body 30 will be described. First, the LED mounting substrate 11 is fitted into the recess 5b at the bottom of the recess 5a of the light source storage case 5. Next, the reflecting member 12 is inserted into the recess 5a, and then the translucent cover 13 is inserted into the recess 5a. Subsequently, the mounting screw 14 is inserted into each of the screw insertion holes 13c, 12c, 11c, and 5c, and the nut 15 is screwed into the tip of the mounting screw 14 protruding to the other surface side of the light source storage case 5. Next, the opening portion of the circuit board storage case 3 storing the circuit board 1 is fixed to the other surface side of the light source storage case 5. Note that an adhesive or an appropriate fixture may be used as the fixing means. Thus, the translucent cover 13, the reflective member 12, and the LED mounting substrate 11 are integrally fixed to the inside of the light source storage case 5 by the mounting screws 14 and the nuts 15, so that the translucent cover 13, the reflective member 12, and Since it is not necessary to fix each LED mounting board 11 inside the light source storage case 5 with an adhesive or the like, it is possible to assemble relatively easily.

  When the lighting fixture of this embodiment is used, the direction orthogonal to the thickness direction of the circuit board 1 is the vertical direction. When the lighting fixture is used attached to the ceiling material C1, the longitudinal direction is The vertical direction. A switching element 21 that is a heat generating component is mounted on the circuit board 1 below the center in the vertical direction of the circuit board 1.

  Next, convection of air inside the circuit board storage case 3 in the case where the lighting fixture of this embodiment is used with the longitudinal direction of the one surface of the circuit board 1 being the vertical direction will be described.

  In FIG. 3, the one-dot chain arrow indicates the convection of air inside the circuit board storage case 3 during use. Since the air heated by the switching element 21 mounted on the one surface of the circuit board 1 has a low density, the air rises to the upper side of the circuit board storage case 3 along the one surface of the circuit board 1. The air rising to the uppermost part inside the circuit board storage case 3 flows on the one surface side of the circuit board 1 in a direction perpendicular to the one surface of the circuit board 1 and away from the one surface. 1 also flows to the other surface side in the thickness direction of the circuit board 1 through the ventilation portion 41 provided at the upper end portion of the circuit board 1. Here, on the one surface side of the circuit board 1, the air flowing in a direction orthogonal to the one surface of the circuit board 1 and away from the one surface is the inner circumference of the circuit board storage case 3 on the one surface side. When the heat is radiated in contact with the surface, the density is increased, and the density is lowered to the lower side of the inside of the circuit board storage case 3 along the inner peripheral surface on the one surface side of the circuit board storage case 3. On the other hand, the air that has flowed to the other surface side of the circuit board 1 comes into contact with the inner peripheral surface on the other surface side of the circuit board storage case 3 and is dissipated to increase the density. It descends to the lower side inside the circuit board storage case 3 along the inner peripheral surface on the other surface side. Here, the air descending to the lowermost part inside the circuit board storage case 3 along the inner peripheral surface on the other surface side of the circuit board storage case 3 passes through the ventilation portion 42 provided at the lower end of the circuit board 1. It flows through the one surface side of the circuit board 1. That is, air convection can be generated on the one surface side and the other surface side of the circuit board 1 inside the circuit board storage case 3.

  Thus, in the lighting fixture of the present embodiment, the density of air existing on the one surface side of the circuit board is different between the upper side and the lower side of the position where the switching element 21 is mounted in use. The one surface side and the other surface of the circuit board 1 through the ventilation portions 41 and 42 provided in such a manner that they are located on the upper and lower sides in the vertical direction with respect to the position where the switching element 21 is mounted. Since the heat generated in the switching element 21 is radiated by convection with air on the side, compared with the case where the heat generated in the switching element 21 is radiated only by convection of air only on the one surface side of the circuit board 1, Heat can be radiated efficiently. In addition, since sufficient heat dissipation can be obtained without bringing the switching element 21 and the circuit board storage case 3 into contact with each other via an insulating member, the structure can be simplified and the number of parts can be reduced. Reduction can be achieved.

  Moreover, in the lighting fixture of this embodiment, since the switching element 21 is mounted below the center in the up-down direction on the one surface side of the circuit board 1, the switching element inside the circuit board storage case 3 during use. Since the heat radiated above the position where the circuit board 21 is mounted and the air descending below the circuit board storage case 3 can be brought into contact with the switching element 21, the heat generated in the switching element 21 can be radiated more efficiently. be able to. Here, if the switching element 21 is mounted on the portion directly above the ventilation portion 41, the air descending along the other surface side of the circuit board 1 is guided to the place where the switching element 21 on the one surface side is disposed. Therefore, the heat generated in the switching element 21 can be radiated more efficiently.

  By the way, when the above-mentioned ventilation parts 41 and 42 are not provided in the circuit board 1, in order to convect air by the said one surface side and the said other surface side of the circuit board 1, the peripheral part of the circuit board 1 It is necessary to allow air flow in the thickness direction of the circuit board 1 by forming a gap between the instrument body 30 and the inner surface of the circuit board storage case 3 of the instrument body 30. Specifically, the area of the opening portion of the section of the circuit board storage case 3 in the circuit board storage case 3 by the plane including the one surface of the circuit board 1 stored inside the circuit board storage case 3 is: It is necessary to increase the size of the circuit board storage case 3 so as to be larger than the area of the circuit board 1.

  On the other hand, in the lighting fixture of the present embodiment, the ventilation portions 41 and 42 are formed in the circuit board 1, so that the inner surface of the circuit board storage case 3 and the peripheral edge portion of the circuit board 1 as described above. There is no need to form a gap between them, and there is no need to increase the size of the circuit board storage case 3. That is, since the ventilation portions 41 and 42 are formed in the circuit board 1, the heat generated in the switching element 21 is efficiently radiated by convection of air between the one surface side and the other surface side of the circuit board 1. it can. Therefore, the area of the circuit board 1 including the vents 41 and 42 is the area of the opening in the cross section of the circuit board storage case 3 by the plane including the one surface of the circuit board 1 stored inside the circuit board storage case 3. Therefore, the circuit board storage case 3 can be reduced in size.

  In addition, when the ventilation portions 41 and 42 are formed inside the circuit board 1, the ventilation portions 41 and 42 can be prevented from cracking at a portion between the outer peripheral edge of the circuit board 1 and the ventilation portions 41 and 42. The distance between the inner periphery and the outer periphery of the circuit board 1 needs to be at least the thickness of the circuit board 1. Therefore, since the distance between the inner periphery of the ventilation portions 41 and 42 and the outer periphery of the circuit board 1 is necessary, there is a limit in reducing the area of the circuit board 1.

  On the other hand, in the lighting fixture of the present embodiment, the ventilation portions 41 and 42 are made of a portion surrounded by the notches 41a and 42a formed in the circuit board 1 and the inner surface of the circuit board storage case 3. By doing so, it is not necessary to form the distance between the inner peripheral portion of the ventilation portion and the edge of the circuit board 1 so as to be equal to or greater than the thickness of the circuit board 1, and the area of the circuit board 1 can be reduced. The circuit board storage case 3 can be downsized. Moreover, since the distance between the switching element 21 and the inner surface of the circuit board storage case 3 can be reduced by downsizing the circuit board storage case 3, the heat generated in the switching element 21 is efficiently radiated. be able to.

  In the lighting fixture of the present embodiment, as shown in FIG. 4, the shape of the ventilation portion 42 provided at the lower end portion of the circuit board 1 is formed so that the dimension in the short direction of the circuit board 1 is increased. It may be. In the configuration of FIG. 4, the air permeability between the one surface side and the other surface side of the circuit board 1 can be further improved, so that the heat generated in the switching element 21 can be radiated more efficiently. it can.

(Embodiment 2)
The basic configuration of the lighting fixture of the present embodiment is substantially the same as that of the first embodiment. As shown in FIG. 5A, the notches 81a and 82a are mounted on the switching element 21 on the rectangular circuit board 1. The difference is that they are also provided on both sides of the position in the short direction. That is, in the lighting fixture of the present embodiment, the cutout portions 81a and 82a and the inner surface of the circuit board storage case 3 are surrounded on both sides in the short direction with respect to the position where the switching element 21 is mounted on the circuit board 1. Ventilation portions 81 and 82 composed of portions are provided. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the present embodiment, as shown in FIG. 5A, when the instrument main body 30 is attached to the ceiling material C1, the longitudinal direction of the circuit board 1 inside the circuit board storage case 3 is the vertical direction. In this case, the ventilation part 41 is located on the lower side in the vertical direction, and the ventilation part 42 is located on the upper side in the vertical direction. Accordingly, air convection can be generated on the one surface side and the other surface side of the circuit board 1 inside the circuit board housing case 3. On the other hand, as shown in FIG. 5 (b), when the lighting fixture is attached to the wall material C2, the short direction of the circuit board 1 in the circuit board storage case 3 is the vertical direction. In this case, the ventilation part 81 is located on the upper side in the vertical direction, and the ventilation part 82 is located on the lower side in the vertical direction. Accordingly, even in this case, air convection can be generated on the one surface side and the other surface side of the circuit board 1 inside the circuit board housing case 3. Therefore, even if the mounting direction of the circuit board storage case 3 changes, the heat generated in the switching element 21 can be efficiently radiated.

  In each of the embodiments described above, the LED 6 is used as the light source.

It is side surface sectional drawing of the lighting fixture of Embodiment 1. FIG. It is a perspective view of a lighting fixture same as the above. It is operation | movement explanatory drawing of a lighting fixture same as the above. It is side surface sectional drawing of the lighting fixture of another Example same as the above. The lighting fixture of Embodiment 2 is shown, (a) is a case where it uses attaching to a ceiling material, (b) is a case where it attaches to a wall material and uses it. It is a principal part schematic sectional drawing which shows a prior art example. It is a principal part schematic sectional drawing which shows another prior art example.

Explanation of symbols

1 Circuit board 6 LED (light source)
21 Switching element (heat generating component)
30 Instrument body 41, 42, 81, 82 Ventilation part 41a, 42a, 81a, 82a Notch

Claims (5)

  A circuit board on which a heat generating component constituting a part of a lighting circuit for turning on a light source is mounted on one surface side in the thickness direction, and a device body in which the circuit board is housed and sealed substantially, A lighting fixture that is arranged and used so that one direction orthogonal to the thickness direction of the board is the vertical direction, and the circuit board includes at least an upper side in the vertical direction with respect to a position where the heat generating component is mounted. A lighting apparatus comprising a ventilation portion that allows ventilation in a thickness direction of a circuit board on a lower side.   The lighting device according to claim 1, wherein the heat generating component is mounted on the circuit board below a center in the vertical direction of the circuit board.   The said ventilation | gas_flowing part is provided also in the both sides of the direction orthogonal to the said up-down direction with respect to the position in which the said heat-emitting component in the said circuit board was mounted, The Claim 1 or Claim 2 characterized by the above-mentioned. lighting equipment.   The circuit board is set so that an area including the ventilation portion is substantially equal to an area of an opening portion of a cross section of the instrument main body by a plane including the one surface of the circuit board accommodated inside the instrument main body. The lighting fixture according to any one of claims 1 to 3, wherein the lighting fixture is formed. The said ventilation | gas_flowing part consists of a part enclosed by the notch part formed in the edge part of the said circuit board, and the inner surface of the said instrument main body, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Lighting fixtures.

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