JP2011134612A - Electronic equipment and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide compact electronic equipment capable of emitting heat of a transformer to a case and further assuring electric insulation between the transformer and the case without requiring a heat-radiating relay member. <P>SOLUTION: A lighting device 5 includes a metal case 11, a circuit module 31 and an insulating sheet 45. The case is formed by a base 12 having a base main wall 12a and a base side wall 12b, and a cover 21 having a cover main wall 21a and a cover side wall 21b connected to the base side wall. A pressing piece 25 is raised by cutting from the cover side wall. The pressing piece has an engaging edge 25a which is so inclined as to approach the cover main wall from the front edge toward the root thereof. The circuit module includes a circuit board 32 and a plurality of electric components which contain the transformer and are mounted on the circuit board. The engaging edge is engaged with the side edge of the circuit board from the base main wall side, and the sheet is sandwiched between the cover main wall and the transformer, to press the transformer against the inner surface of the main wall. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic device such as a power supply device and a lighting device in which a circuit board on which an electrical component is mounted is housed in a metal case, and a lighting fixture including the electronic device.

  Conventionally, a metal case composed of a housing member and a lid member is mounted with a plurality of electrical components including components such as a transformer that generate a large amount of heat, and the back surface of the substrate is electrically insulated from the inner surface of the housing member. Insulating sheet for the above, and filling with a foaming heat dissipation material having electrical insulation only between the back surface of the wiring board and the insulating sheet corresponding to the mounting part of the electrical component such as the transformer which generates large heat In addition, a discharge lamp lighting device having improved heat dissipation performance from an electrical component such as a transformer to a housing member is known (see, for example, Patent Document 1).

  In addition, a substantially flat heat dissipation device larger than this core is contacted and fixed to the upper core of a transformer mounted on a printed circuit board incorporated in a small portable device, and the side opposite to the surface fixed to the upper core of the heat dissipation device A technique is known in which the surface of the transformer is fixed to the inner surface of the case, the heat of the transformer is conducted to the case through a substantially flat plate-like heat dissipation device, and discharged from the case (see, for example, Patent Document 2). .)

JP 2004-274018 A JP 2002-222720 A

  Patent Document 1 discloses a heat dissipation structure from an electrical component that generates a large amount of heat such as a transformer to a housing member of a metal case as described above. However, there is no description of heat dissipation from the electrical component to the lid member of the metal case, and since the electrical component and the lid member are provided with a predetermined space insulation distance, There is a problem that heat cannot be radiated to the lid member. Furthermore, since the thickness of the case is large due to the space insulation distance, there is a problem that it is disadvantageous in reducing the thickness.

  Further, in Patent Document 2, as described above, the heat of the transformer is transferred to the case by being fixed to the upper core of the transformer and passing through a substantially flat heat radiation member interposed between them and larger than the transformer. An escape technique is disclosed. However, even in this conventional technique, there is a problem that a substantially flat plate-like heat radiating member is necessary as a relay member for releasing the heat of the transformer to the case, and the cost is accordingly increased. Furthermore, Patent Document 2 does not describe specific means for fixing the heat radiating member to the case. If there are variations in the height position of the printed circuit board and the upper core of the transformer with respect to the case, the upper core of the transformer may not be properly brought into close contact with the inner surface of the case, and the heat dissipation performance from the transformer to the case may deteriorate. In addition, a metal plate is optimal as the heat radiating member. However, the technique of Patent Document 2 in which the metal plate is directly fixed to the inner surface of the case has a problem that the electrical insulation performance between the transformer and the case is low.

  Therefore, the object of the present invention is to dissipate the heat of the transformer into the case without requiring a relay member for heat dissipation, and regardless of variations in the dimensions of the transformer and the metal case from which the heat of the transformer is released. Another object of the present invention is to provide a compact electronic device that can secure electrical insulation between a transformer and a case and a lighting fixture including the electronic device.

  In order to solve the above-mentioned problems, an electronic device according to a first aspect of the present invention is a metal base having a base main wall and a base side wall bent from the base main wall, and a cover main wall and the cover main wall. And a metal cover having a cover side wall connected to the base side wall, the press having an engagement edge inclined so as to gradually approach the cover main wall from the tip toward the base A case in which a piece is cut and raised from the side wall of the cover; a circuit board, and a plurality of electrical components mounted on the circuit board including a transformer; and the engagement of the pressing piece on a side edge of the circuit board A circuit module housed in the case so that an edge is engaged from the base main wall side and the transformer is pressed against the inner surface of the cover main wall; and covers the inner surface of the cover It is characterized by comprising; sandwiched an insulating sheet between the cover main wall and the transformer while being built in the casing.

  In the present invention and the following invention, the base and cover metal forming the case can be made of an aluminum alloy or an iron-based metal, and the former metal material is preferable in terms of good heat dissipation. A metal material is preferable in that the material cost is low. In the present invention and the following invention, the base main wall of the base may be formed to have at least a flat surface portion at the center in the width direction, even if the entire base main wall is formed of a flat surface portion. Good.

  In the present invention and the following invention, a circuit module housed in a case so that the engaging edge of the pressing piece is engaged with the side edge of the circuit board from the base main wall side and the transformer is pressed against the inner surface of the cover main wall. Compared with the state in which at least the part of the circuit board where the transformer is mounted is not engaged with the engaging edge of the pressing piece on the side edge of the circuit board, the engaging edge of the pressing piece on the side edge of the circuit board Is engaged so as to be pressed against the inner surface of the cover main wall. Therefore, the mode in which the entire circuit module is shifted may be used. Alternatively, as described in the embodiment, the longitudinal intermediate portion of the circuit board is shifted except for both ends in the longitudinal direction of the circuit board. May be. Depending on these forms, the position and number of the pressing pieces can be selected as appropriate. However, providing the pressing pieces corresponding to the portion of the circuit board where the transformer is mounted and the position in the vicinity thereof can cover the transformer with the pressing pieces. This is preferable in that the inner surface of the wall is surely pressed. Further, the pressing piece may be provided by cutting and raising from at least one of the pair of cover side walls located on both sides of the width direction (direction orthogonal to the longitudinal direction) of the circuit board. It is preferable that the heat conduction from the transformer to the cover is improved.

  In the present invention and the following invention, the insulating sheet is formed from a thin insulating paper, a thin synthetic resin sheet, or the like, and another insulating sheet made of the same material may be provided to cover the inner surface of the base. In this case, it is preferable in that the case can be made more compact in the thickness direction by reducing the insulation distance between the circuit module and the base main wall.

  In the invention of claim 1, the pressing piece is cut and raised from the cover side wall to the inside of the cover in a state where the circuit module and the insulating sheet are accommodated in the cover of the metal case. Thereby, as the pressing piece protrudes, the inclined engaging edge engages with the side edge of the circuit board from the base main wall side, so that the transformer is mounted at least on the circuit board as the cut-and-raise angle increases. The formed part is brought close to the cover main wall, and the transformer is pressed against the inner surface of the cover main wall with the insulating sheet interposed therebetween.

  The heat generated by the transformer due to energization is conducted to the metal cover through the insulating sheet and released around the cover, and is also conducted to the metal base connected to the cover side wall and released. The In this way, the heat of the transformer is directly released to the cover of the case, so there is no need for a relay member for heat dissipation between the transformer and the cover, and the electrical insulation performance between the circuit module and the metal cover by the insulating sheet Can be secured. Further, even if the height dimension of the transformer varies, the variation is absorbed by changing the position at which the engaging edge of the pressing piece contacts the side edge of the circuit board by changing the cut-and-raised angle of the pressing piece. Since the height position of the transformer is adjusted and the transformer is pressed against the inner surface of the cover main wall with the insulating sheet interposed therebetween, the heat of the transformer can be released to the case regardless of the dimensional variation. Further, since there is no space insulation distance between the cover main wall and the transformer, the case is thinned in the thickness direction, and a compact electronic device can be provided.

  According to a second aspect of the present invention, in the first aspect of the invention, both end portions in the longitudinal direction of the circuit board are fixed to the base so that the circuit board does not move in the thickness direction of the case. The pressing piece is cut and raised corresponding to the mounting portion of the transformer, and the engaging edge of the pressing piece is engaged with the side edge of the circuit board at the mounting portion of the transformer. .

  In the invention according to claim 2, the circuit board is pressed by the pressing piece with the transformer mounting center on the circuit board as a center in a state where both ends in the longitudinal direction of the circuit board are fixed to the base so as not to move in the thickness direction of the case. Therefore, the transformer is more reliably pressed against the inner surface of the cover main wall with an insulating sheet sandwiched between the inner surface and the heat of the transformer can be more effectively released to the cover of the case.

  A lighting fixture according to a third aspect of the present invention is a lighting device comprising: an fixture main body; a light source attached to the fixture main body; and a lighting device comprising the electronic device according to claim 1 or 2 attached to the fixture main body to turn on the light source. And a device. In the present invention, the light source is not limited to a discharge lamp such as a fluorescent lamp, but may be an LED light source using an LED (light emitting diode) as a light source element.

  Since the lighting device of the invention of claim 3 comprises the electronic device according to claim 1 or 2, the lighting device does not require a relay member for heat dissipation between the transformer and the cover, and the transformer A lighting fixture with a compact lighting device that can release the heat of the transformer to the case regardless of the dimensional variation of the metal case from which the heat of the transformer is released, and can ensure electrical insulation between the transformer and the case Can provide.

  According to the electronic device of the first and second aspects of the present invention, no relay member for heat dissipation is required between the transformer and the cover, and the dimensional variation between the transformer and the metal case from which the heat of the transformer is released is concerned. Therefore, the heat of the transformer can be released to the case, and the electrical insulation between the transformer and the case can be secured, and the thickness can be reduced in size.

  According to the lighting fixture of the invention according to claim 3, since the lighting device provided therein is composed of the electronic device according to claim 1 or 2, without requiring a relay member for heat dissipation between the transformer and the cover, In addition, a transformer and a compact lighting device that can release heat from the transformer to the case regardless of the dimensional variations of the metal case from which the heat from the transformer is released, and that can ensure electrical insulation between the transformer and the case. There is an effect that it can provide the lighting equipment.

It is a perspective view which shows the lighting fixture which concerns on one Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the lighting device which concerns on one Embodiment of this invention with which the lighting fixture of FIG. 1 is provided. It is a perspective view which disassembles and expands and shows the one end part of the lighting device of FIG. It is sectional drawing which shows the lighting device of FIG. FIG. 3 is an end view showing the lighting device of FIG. 2 as viewed from one end in the longitudinal direction to the other end and a part thereof in section.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

  Reference numeral 1 in FIG. 1 denotes a lighting fixture. The lighting fixture 1 includes a fixture main body, for example, a chassis 2, a lamp socket 3, a light source, for example, a discharge lamp as a specific example, a straight fluorescent lamp 4, and an electronic device, for example. And a lighting device 5. The lighting device 5 is formed to function as an electronic ballast for lighting the fluorescent lamp 4 as a light source.

  The chassis 2 illustrated in FIG. 1 is made of metal and has a rectangular parallelepiped shape. The lamp sockets 3 protrude downward, for example, at both ends in the longitudinal direction of the chassis 2. The fluorescent lamp 4 is detachably supported by the lamp socket 3. The lighting device 5 is built in the chassis 2.

  As shown in FIGS. 4 and 5, the lighting device 5 includes a case 11, a circuit module 31, a first insulating sheet 41, and a second insulating sheet 45.

  As shown in FIGS. 2 and 3, the case 11 has a base 12 and a cover 21 connected thereto. The base 12 and the cover 21 are made of metal, for example, an aluminum alloy excellent in heat dissipation.

  As shown in FIGS. 2 and 3, the base 12 is bent so as to be perpendicular to both ends of the flat base main wall 12a and the width direction (short direction perpendicular to the longitudinal direction) of the base main wall 12a. It has a pair of base side walls 12b. The total length of the base 12 is longer than a circuit board 32 described later.

  Fixing portions 13 and positioning pieces 14 are formed at both ends in the longitudinal direction of the base main wall 12a. The fixing portion 13 is formed by a hole or a notch. The lighting device 5 is attached to the chassis 2 with the base main wall 12 a being brought into surface contact with the chassis 2 by a fixing component (not shown) such as a screw passing through the fixing portions 13. The base 12 functions as a heat transfer surface to the chassis 2. The positioning piece 14 is cut and raised, and is parallel to the base side wall 12b.

  A substrate receiving portion 16, a connecting hole 17, a substrate fixing piece 18, and a through portion 19 are formed on each of the base side walls 12b facing each other in the width direction of the base main wall 12a. The board receiving part 16, the connecting hole 17, the board fixing piece 18, and the through part 19 are respectively provided at both ends in the longitudinal direction of the base side wall 12b, and are arranged from the end of the base main wall 12a in this order. . The substrate receiving portion 16 may be additionally provided in the middle portion in the longitudinal direction of the base side wall 12b.

  The substrate receiving portion 16 is formed on the inner side of the case 11 so as to protrude from the inner surface of the base side wall 12b. As shown in FIG. 3, these substrate receiving portions 16 have, for example, a substantially arc shape, are formed apart from the base main wall 12a, and are parallel to the base main wall 12a. The connecting hole 17 is a square through hole.

  The board fixing piece 18 is provided so as to be cut and raised by being pushed into the inside of the case 11, and can be brought close to the base main wall 12a by this cutting and raising. The through portion 19 is formed by, for example, a square through hole, but can also be formed by a groove that opens to an edge extending in the longitudinal direction of the base side wall 12b. The substrate receiving portion 16 and the substrate fixing piece 18 constitute module fixing means for the base 12.

  The cover 21 has, for example, a cover main wall 21a, a cover side wall 21b, and an end wall 21c. The cover main wall 21a has a flat surface portion 21ad occupying the central portion in the width direction and portions bent obliquely from the flat surface portion 21ad to both sides in the width direction of the cover 21. The cover side wall 21b is bent from these oblique portions. The end walls 21c are bent at right angles from the flat surface portions 21ad at both longitudinal ends of the cover main wall 21a. The end wall 21c is provided so as to close both ends of the bowl-shaped longitudinal direction formed by the cover main wall 21a and the cover side wall 21b.

  The cover 21 is formed shorter than the base 12 in order to expose an electric wire connector which will be described later. A first connecting claw 23, a second connecting claw 24, and a pressing piece 25 are provided at both ends in the longitudinal direction of the cover side wall 21b.

  The first connection claw 23 and the second connection claw 24 and the connection hole 17 form a case connection for assembling the case 11. The first connection claw 23 is formed to extend in the height direction of the cover side wall 21b, and the second connection claw 24 is formed to extend in the longitudinal direction of the cover side wall 21b. The first connection claw 23 and the second connection claw 24 are provided so as to be cut and raised by being pushed inside the cover 21, and the two hole edges of the connection hole 17 sandwiching 90 ° by the cut and raise. To be engaged.

  The pressing piece 25 is provided to be cut and raised by being pushed into the inside of the cover 21. The pressing piece 25 is provided at a position corresponding to a mounting portion of transformers 35a and 35b described later with respect to a circuit board 32 described later. At the same time, the pressing piece 25 has an engagement edge 25a (see FIG. 4) and is tapered. As shown in FIGS. 3 and 4, the engagement edge 25 a is inclined so as to gradually approach the cover main wall 21 a from the tip of the pressing piece 25 toward the base.

  As shown in FIG. 2, the circuit module 31 that turns on the fluorescent lamp 4 includes a circuit board 32, an input wire connector 33, an output wire connector 34, and a plurality of electrical components 35.

  The circuit board 32 has a circuit pattern (not shown). An electric wire connector 34 is mounted on one end of the circuit board 32 in the longitudinal direction and connected to the circuit pattern, and similarly, an electric wire connector 33 is mounted on the other end in the longitudinal direction of the circuit board 32 and connected to the circuit pattern. The circuit board 32 has a size that can be accommodated in the cover 21 except for both ends in the longitudinal direction, and its total length is slightly shorter than the distance between the positioning pieces 14 of the base 12.

  Various electrical components 35 are mounted between the electric wire connectors 33 and 34 and connected to the circuit pattern on the circuit board 32. The electrical component 35 includes an input-side and output-side transformer 35a in addition to a power transistor, a resistor, a capacitor, a coil, a diode, and a chip component. Most of the electrical components 35 are mounted on one surface of the circuit board 32, and thin electrical components such as chip components are mounted on the other surface of the circuit board 32.

  The input-side transformer 35 a is mounted on one end portion in the longitudinal direction of the circuit board 32, and the output-side transformer 35 a is mounted on the other end portion in the longitudinal direction of the circuit board 32. These transformers 35a and 35b are the tallest components among the electrical components 35 and the cores of the respective transformers 35a and 35b, which are the components that generate heat most easily among the electrical components 35 other than the power transistor. The side surface 35c opposite to the circuit board 32 and parallel to the circuit board 32 is formed as a flat surface. When the lighting device 5 is assembled, the side surface 35c is positioned within the projection region of the flat surface portion 21ad of the cover 21 when the lighting device 5 is viewed in the direction of the base 12 with the cover 21 facing the front. Is provided.

  The first insulating sheet 41 and the second insulating sheet 45 are formed of an inexpensive and heat-resistant synthetic resin such as PP (polypropylene resin) or PET (polyethylene terephthalate resin).

  The first insulating sheet 41 is formed in advance in a shape along the inner surface of the base 12. The first insulating sheet 41 covers the inner surface of the base 12 and is built in the case 11 and is responsible for electrical insulation of the circuit module 31 with respect to the base 12. The first insulating sheet 41 has substantially the same length as the entire length of the circuit board 32 included in the circuit module 31. As shown in FIG. 3, a first relief portion 41 to a third relief portion 44 are respectively formed at both longitudinal ends of the first insulating sheet 41 and at portions covering the base side wall 12b. ing.

  The first relief portion 41 is a portion through which the substrate receiving portion 16 is passed. For example, the first relief portion 41 is formed by a square through hole, but may be formed by a notched groove. The second relief portion 42 is a portion for preventing the first insulating sheet 41 from obstructing the raising and lowering of the substrate fixing piece 18. For example, the second relief portion 42 is formed by a notched groove. It can also be formed with holes. The third escape portion 43 is a portion for enabling the pressing piece 25 to be raised and raised, and is formed by, for example, a square through hole, but can also be formed by a notched groove.

  The second insulating sheet 45 is formed in advance in a shape along the inner surface excluding the end wall 21 c of the cover 21. The second insulating sheet 45 covers the inner surface of the cover 21 and is built in the case 11 and is responsible for electrical insulation of the circuit module 31 with respect to the cover 21.

  Next, the assembly procedure of the lighting device 5 will be described.

  First, the first insulating sheet 41 is disposed along the inner surface of the base 12. The positioning pieces 14 of the base 12 are brought close to both ends in the longitudinal direction of the first insulating sheet 41 arranged in this manner, and the first insulating sheet 41 is positioned on the base 12 so as not to move in the longitudinal direction. At this time, each substrate receiving portion 16 of the base 12 is passed through each of the first relief portions 42 of the first insulating sheet 41, and these substrate receiving portions 16 are protruded inside the first insulating sheet 41. The At the same time, each of the second escape portions 43 of the first insulating sheet 41 is opposed to each of the substrate fixing pieces 18 of the base 12. Further, each of the third relief portions 44 of the first insulating sheet 41 is opposed to each through portion 19 of the base 12.

  Next, the assembled circuit module 31 is inserted so that the one surface on which most of the electrical components 35 are mounted faces upward, and fits in the first insulating sheet 41, and the other surface of the circuit board 32 is placed on the board receiving side. It is made to mount in the part 16, respectively. As a result, the circuit module 31 is arranged away from the base main wall 12a, and the positioning pieces 14 of the base 12 are brought close to both ends in the longitudinal direction of the circuit board 32, respectively, similarly to the first insulating sheet 41. The circuit module 31 is positioned on the base 12 so as not to move in the longitudinal direction. With this positioning, the mounting portions of the transformers 35a and 35b on the circuit board 32 are arranged so as to correspond to the through portions 19 through which the pressing pieces 25 described later are passed.

  In this state, each substrate fixing piece 18 of the base 12 is cut up toward the inside of the base 12. As a result, each board fixing piece 18 protruding and bent inside the base 12 through the second escape portion 43 is engaged with the side edge 32a extending in the longitudinal direction of the circuit board 32 from above, so that the circuit At both ends of the substrate 32 in the longitudinal direction, the circuit board 32 is sandwiched in the thickness direction by the substrate receiving portion 16 and the substrate fixing piece 18 which is located in the vicinity and cut and raised as described above. (See FIG. 5). Therefore, both longitudinal ends of the circuit board 32 are fixed to the base 12 so that the circuit board 32 of the circuit module 31 does not move in the thickness direction of the base 12.

  Thereafter, the second insulating sheet 45 is placed on the circuit module 31. At this time, both side plates of the second insulating sheet 45 are overlapped with inner surfaces of both side plates of the first insulating sheet 41.

  Furthermore, the second insulating sheet 45 is accommodated, and the wire connectors 33 and 34 are exposed to cover the cover 21 on the base 12. Thereby, the cover side wall 21b of the cover 21 overlaps the outer surface of the base side wall 12b, and the base 12 and the cover 21 are combined through the base side wall 12b and the cover side wall 21b so as to be able to conduct heat. Note that the cover 21 may be placed on the base 12 after the second insulating sheet 45 is set in the cover 21.

  As a result, the cover 21 is properly fitted to the base 12. In this state, the side surfaces 35c of the transformers 35a and 35b are in slight contact with the flat surface portion 12ad of the cover main wall 12a via the second insulating sheet 45. In this case, both sides of the second insulating sheet 45 Since the plate portion is not in contact with the circuit board 32 or is in contact with the circuit board 32 and bends, the plate portion does not hinder proper fitting of the cover 21 to the base 12.

  Thus, when the cover 21 is properly fitted to the base 12, the first connection claw 23 and the second connection claw 24 face the connection hole 17 of the base side wall 12b. At the same time, each of the pressing pieces 25 is opposed to the through portion 19 of the base side wall 12b. Accordingly, each pressing piece 25 corresponds to a mounting portion of the transformers 35 a and 35 b on the circuit board 32. Here, that the pressing piece 25 corresponds to the mounting portion refers to a state in which the pressing piece 25 is disposed in the range of the length range L (see FIG. 2) of the transformers 35a and 35b.

  Next, in this state, the first connecting claw 23 and the second connecting claw 24 are cut up toward the inside of the cover 21. As a result, the first connecting claw 23 is hooked on the lower hole edge of the connecting hole 17 so that the cover 21 does not come off in the thickness direction of the base 12, and the second connecting claw 24 is connected to the connecting hole 17. The base 12 is connected so as not to move in the longitudinal direction of the cover 21 by being caught by the hole edge extending in the vertical direction. The case 11 is assembled by this connection.

  Finally, each of the pressing pieces 25 of the case 11 assembled in this way is bent (cut up) toward the inside of the case 11. Along with this bending, first, the tip portion of each pressing piece 25 enters the lower side (back side) of the circuit board 32 included in the circuit module 31, so as the bending of each pressing piece 25 continues, 25 inclined engagement edges 25a engage a part of the side edge 32a extending in the longitudinal direction of the circuit board 32, that is, the circuit board 32 from the base main wall 12a side to the side edge part corresponding to the transformer mounting part. The circuit board 32 is pressed and deformed toward the cover main wall 21a.

  2 indicates the height position in the case 11 of the circuit board 32 in a state before the pressing piece 25 is cut and raised. The solid line in FIG. 2 shows a state in which the transformer mounting portion of the circuit board 32 is pushed up with deformation due to the pressing piece 25 being cut and raised.

  Therefore, as the cut-and-raised angle of each pressing piece 25 increases as a result of the assembly of the lighting device 5, the portion of the circuit board 32 where at least the transformers 35a and 35b are mounted becomes the flat surface portion 21ad of the cover main wall 21a. The side surfaces 35c of the transformers 35a and 35b are pressed against the inner surface of the flat surface portion 21ad in the cover main wall 21a with the second insulating sheet 45 interposed therebetween (see FIG. 4).

  In this case, both ends in the longitudinal direction of the circuit board 32 are fixed so as not to move in the thickness direction of the case 11, and the circuit board 32 is deformed by the pressing piece 25 around the transformer mounting portion, so that the transformers 35a and 35b Can be more reliably pressed against the inner surface of the flat surface portion 21ad of the cover main wall 21a with the second insulating sheet 45 interposed between the inner surface and the inner surface.

  Thereby, even if the height dimensions of the transformers 35a and 35b vary, the cut-and-raised angle of the pressing piece 25 is changed to change the position where the engaging edge 25a of the pressing piece 25 contacts the side edge 32a of the circuit board 32. Thus, the height positions of the transformers 35a and 35b are adjusted so as to absorb the variation, and the transformers 35a and 35b are pressed against the inner surface of the cover main wall 21a with the second insulating sheet 45 interposed therebetween. The lighting device 5 can be assembled.

  When the fluorescent lamp 4 of the lighting fixture 1 is turned on by the lighting device 5, the transformers 35a and 35b generate heat. The heat of the transformers 35 a and 35 b is conducted to the metal cover 21 through the thin second insulating sheet 45 and is released to the periphery of the cover 21. At the same time, heat is conducted to the metal base 12 connected to the cover side wall 21 b and is discharged to the chassis 2 of the luminaire 1 through the base 12.

  As described above, the heat of the transformers 35a and 35b is directly discharged to the cover 21 of the case 11 regardless of the dimensional variation, so that no heat dissipation relay member is required between the transformers 35a and 35b and the cover 21. Therefore, the cost can be reduced as the number of parts and assembly man-hours are reduced. At the same time, electrical insulation performance between the circuit module 31 and the metal cover 21 can be secured by the second insulating sheet 45. Furthermore, the transformers 35a and 35b having the highest height among the electrical components 35 mounted on the circuit module 31 are pressed against the inner surface of the cover main part 21a, so that the transformers 35a and 35b and the cover main part 21a Since the space insulation is eliminated, the thickness of the case 11 can be reduced, and the lighting device 5 can be made compact in the thickness direction.

  In the implementation of the present invention, a configuration in which a foamable heat radiating member is locally provided between the circuit board 32 and the base main wall 12a as in the prior art document 1 is added, and the heat of the transformers 35a and 35b is increased. It is not hindered to dissipate heat to the base 12 side.

  DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Chassis (equipment main body), 4 ... Fluorescent lamp (light source), 5 ... Lighting apparatus (electronic device), 11 ... Case, 12 ... Base, 12a ... Base main wall, 12b ... Base side wall, 17 ... Connection hole 21. Cover 21a Cover main wall 21b Cover side wall 23. First connection hole 24 Second connection hole 25 Pressing piece 25a Locking edge 31 Circuit module 32 ... Circuit board, 32a ... Side edge of circuit board, 35 ... Electrical components, 35a, 35b ... Transformer, 45 ... Insulating sheet

Claims (3)

A metal base having a base main wall and a base side wall bent from the base main wall, and a cover main wall and a metal cover having a cover side wall bent from the cover main wall and connected to the base side wall A case in which a pressing piece having an engagement edge inclined so as to gradually approach the cover main wall from the tip toward the base is cut from the cover side wall;
A plurality of electrical components mounted on the circuit board including a circuit board and a transformer, and an engagement edge of the pressing piece is engaged with a side edge of the circuit board from the side of the base main wall. A circuit module housed in the case so that the transformer is pressed against the inner surface of the wall;
An insulating sheet that covers the inner surface of the cover and is embedded in the case and sandwiched between the cover main wall and the transformer;
An electronic apparatus comprising:   Both end portions in the longitudinal direction of the circuit board are fixed to the base so that the circuit board does not move in the thickness direction of the case, and the pressing piece is cut corresponding to the mounting part of the transformer with respect to the circuit board. The electronic device according to claim 1, wherein the electronic device is raised and an engagement edge of the pressing piece is engaged with a side edge of the circuit board at a portion where the transformer is mounted. An instrument body;
A light source attached to the instrument body;
A lighting device comprising the electronic device according to claim 1 or 2, wherein the lighting device is attached to the fixture body to turn on the light source.
The lighting fixture characterized by comprising.

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