JP2010170840A - Electrical apparatus and luminaire - Google Patents

Abstract

There is no need to prepare various sizes and shapes according to the size and shape of a heat generating component, and an appropriate amount of heat is dissipated for a heat generating component having any shape such as a bottom surface while ensuring insulation. Provided is an electric device configured to be able to easily dissipate heat using a resin.
A circuit board having a first insulating sheet disposed on an inner surface of a base case and mounted with electrical components including a heat generating component is connected to the bottom surface of the base case through the first insulating sheet. The second insulating sheet is disposed on the inner surface of the cover case along the inner surface of the cover case, and a required region corresponding to the heat generating component 51 is provided on the first insulating sheet 3 adjacent to the heat generating component 51. A plurality of stud portions 31 are formed to protrude toward the heat generating component 51 so as to be formed, and in the required region, an insulating heat radiation resin 60 that is thermally coupled to the heat generating component 51 is disposed in the required region.
[Selection] Figure 2

Description

  The present invention relates to an electric device that is configured in a box shape by a base case and a cover case that is a lid of the base case, and includes an insulating sheet for insulating an internal circuit.

  In the conventional lighting device for lighting, as shown in FIG. 6A, a plate-like fixed shape is formed on the head 91t and the bottom portion 91b of the heat generating component 91 mounted on one surface of the circuit board 90. Heat was dissipated by interposing a silicone sheet 93 having The silicone sheet 93 provided on the head 91 t of the heat generating component 91 is interposed between the insulating sheet 95 provided inside the cover case 94 and the head 91 t of the heat generating component 91.

  Alternatively, as shown in FIG. 6B, the heat generating component 96 mounted on the back surface of the circuit board 90 is interposed between the insulating sheet 98 provided inside the base case 97 and the head 96 t of the heat generating component 96. A silicone sheet 93 is interposed.

  However, since the silicone sheet 93 as described above has a fixed shape, as described above, the size and thickness are adjusted in accordance with the size and shape of the heat generating component and further in accordance with the dimension between the heat generating component and the insulating sheet. It is necessary to prepare a wide variety of lineups, etc., which is troublesome and expensive. In addition, in the manufacturing process, it is necessary to select and mount an appropriate silicone sheet according to the size and shape of the heat-generating component, and also according to the dimensions between the heat-generating component and the insulating sheet, which improves work efficiency. It was also a problem from the point of view.

  In contrast to the above, the insulating sheet disposed on the base case side of the substrate is provided with an annular convex portion projecting toward the substrate side, and the concave portion surrounded by the annular convex portion is filled with a foam heat dissipation material. An electric lamp lighting device is known (see Patent Document 1).

  However, in the discharge lamp lighting device described above, an annular shape or an annular shape around the periphery of the rectangle is relatively easy to create, but if it tries to match the shape of the bottom surface of the heat-generating component, it can be created. There was a problem that it was difficult.

  In addition, even though the shape of the region surrounded by the convex portion having an annular shape can be brought close to the shape of the bottom surface of the heat generating component, it is often different from the shape of the bottom surface of the heat generating component. An area having the required area cannot be surrounded by a convex part having an annular shape, and in the case of a convex part surrounding a wide area, useless foaming heat dissipation material is required, and conversely, a narrow area is surrounded. In the case of a convex part, there is a problem that sufficient heat radiation of a necessary part cannot be expected.

  The present invention solves the problems of the above-mentioned conventional electric devices such as lighting devices, and has various sizes and shapes according to the size and shape of the heat generating component such as a silicone sheet. Provide an electrical device that can easily dissipate heat using any appropriate amount of heat-dissipating resin, regardless of the shape of the bottom surface, while ensuring insulation. The purpose is to do.

  An electric device according to the present invention includes a base case configured in a bowl shape by a bottom surface portion and a pair of side wall portions continuous upward from both sides of the bottom surface portion; and a top plate portion and continuously from both sides of the top plate portion. A cover case having a pair of side plate portions formed so as to overlap the side wall portion of the base case, and the pair of side plate portions engaged with the side wall portion of the base case; and an inner surface of the bottom surface portion of the base case And an insulating sheet disposed on the inner surface of the base case so as to be along the inner surfaces of the pair of side wall portions; and a circuit board on which an electrical component including a heat generating component is mounted. An electric circuit disposed on the bottom surface side; a plurality of stud portions formed to protrude toward the heat generating component so as to form a required area corresponding to the heat generating component in an insulating sheet adjacent to the heat generating component; Disposed in the desired region of the over bets, characterized by comprising a thermally bonded to the insulating radiator resin to the heat-generating component.

  The insulating heat-dissipating resin has an insulating performance equivalent to that of the insulating sheet, and those that have received E-type insulator registration are suitable. As the insulating heat-dissipating resin, a predetermined grade of urethane resin, silicone resin or the like excellent in weather resistance and insulation can be used. The heat-generating component is a required electrical and electronic component that needs to be dissipated because it generates heat. Examples of the heat-generating component include, but are not limited to, a transformer, a transistor, and a capacitor. Moreover, what has thixotropy is suitable for insulating heat dissipation resin. Thixotropy means thixotropy, a property that increases fluidity when stirred and solidifies when allowed to stand, and does not flow even when placed on an inclined surface or vertical surface after coating. .

  The shape of the stud portion may be any shape such as a truncated cone shape, a cylindrical shape, or a prism shape. Further, the distance between the adjacent stud portions is not particularly limited as long as it is a distance capable of pressing the insulating heat radiating resin at a required position. Furthermore, it is not necessary for all the stud portions to have the same shape.

  The electrical device according to the present invention is characterized in that the circuit board is supported by a tip portion of at least one stud portion.

  From the viewpoint of stable support, it is desirable to support the circuit board with three or more stud portions. Therefore, the height dimensions of the plurality of stud portions are not necessarily the same.

  A lighting fixture according to the present invention comprises: the electric device according to claim 1 or 2 used as a lighting device; a light source that is turned on by the lighting device; and a fixture body on which the lighting device and the light source are arranged. It is characterized by doing.

  According to the electric device according to the present invention, the plurality of stud portions are formed to protrude toward the heat generating component so as to form a required region corresponding to the heat generating component in the insulating sheet adjacent to the heat generating component. The plurality of stud portions function as walls, and the insulating heat radiation resin can be confined in the predetermined region. In this case, it is possible to dissipate heat by using an appropriate amount of insulating heat radiating resin in a necessary and sufficient range by arranging the stud portions at appropriate intervals in accordance with the shape of the bottom surface of the heat generating component. Therefore, there is no waste and efficient heat dissipation can be realized.

  According to the electrical device of the present invention, since the circuit board is supported by the tip of at least one stud portion, this stud portion is used instead of the claw formed by cutting out a part of the base case. In addition, the circuit board can be supported by an insulating material, and components can be arranged in the vicinity of the point to be supported, so that the degree of freedom of component arrangement can be made higher than in the past.

  According to this invention, the lighting fixture provided with the electric equipment of Claim 1 or 2 can be provided.

1 is a partially omitted assembly perspective view showing a discharge lamp lighting device that is an embodiment of an electrical apparatus according to the present invention. The partial cross section side view which shows the principal part structure in 1st Embodiment of the discharge lamp lighting device which is an Example of the electric equipment which concerns on this invention. The top view which shows the principal part structure of the insulating sheet used for the discharge lamp lighting device which is the Example of the electric equipment which concerns on this invention. The partial cross section side view which shows the principal part structure in 2nd Embodiment of the discharge lamp lighting device which is an Example of the electric equipment which concerns on this invention. The perspective view which shows the structure of the lighting fixture comprised using the Example which concerns on the electric equipment of this invention. The partial cross section side view which shows the principal part structure of the discharge lamp lighting device which is the prior art example of an electric equipment.

  Hereinafter, with reference to the accompanying drawings, embodiments of electrical equipment and lighting equipment such as lighting devices according to the present invention will be described. In each figure, the same components are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 shows a discharge lamp lighting device which is an embodiment of an electric apparatus according to the present invention.

  The discharge lamp lighting device 1 includes a base case 2, a first insulating sheet 3, a lighting circuit 4, a cover case 5, and a second insulating sheet 7 as main components. The first edge sheet 3 is arranged along the inner side of the base case 2 and blocks electrical connection between the metal base case 2 and the lighting circuit 4. The lighting circuit 4 has a configuration in which electrical components are mounted on a circuit board 6. The cover case 5 has the function of a lid that covers the base case 2, and a second insulating sheet 7 having an R shape corresponding to an upwardly convex semicircular arc is disposed along the inside of the cover case 5. Is done. The lighting circuit 4 is housed in a state of being covered with the first insulating sheet 3 and the second insulating sheet 7 in a housing constituted by the cover case 5 and the base case 2.

  The base case 2 is configured, for example, by bending a single metal flat plate and providing a pair of side wall portions 2b, 2b on both sides of the bottom surface portion 2a. As the metal, for example, a steel plate material is used. The bottom surface portion 2a is formed in an elongated rectangular shape. The pair of side wall portions 2b and 2b are bent upward from both sides so as to extend along the longitudinal direction of the bottom surface portion 2a, and the base case 2 as a whole is formed in a substantially bowl shape substantially orthogonal to the bottom surface portion 2a and facing each other. Has been.

  The pair of side wall portions 2b, 2b are respectively formed with a hole 8 as an engaging portion and a rectangular through hole 10 at one end side 2ba in the longitudinal direction and the other end side (not shown) and the center position. The hole 8 is formed in a circular shape and is sized to engage with a convex portion (convex toward the base case 2) 16 that is an engaging portion of the cover case 5.

  Further, in the pair of side wall portions 2b and 2b, long substrate support step portions 22 projecting inward of the side wall portions 2b and 2b are respectively provided at one end side 2ba in the longitudinal direction and the other end side (not shown) and the center position. Is formed. A total of six board support steps 22 support the circuit board 6 via the first insulating sheet 3. Further, a mounting hole 12 is formed in one end side 2aa in the longitudinal direction of the bottom surface portion 2a and the other end side (not shown).

  The first insulating sheet 3 is made of an insulating resin formed in a flat shape, for example, an elastic resin such as polyethylene terephthalate (PET) having a thickness of about 0.2 to 1.0 mm, and extends along the inner surface of the base case 2. The base case 2 is partially protruded upward from the side walls 2b and 2b. The material and thickness of the second insulating sheet 7 are provided.

  The lighting circuit 4 is configured by mounting electrical components on a circuit board 6. On the upper surface 6 a of the circuit board 6, an input terminal block 13 is disposed on one end side 6 b, and an output terminal block is disposed on the other end side (not shown). A power supply line from a commercial AC power supply is connected to the input terminal block 13, and a lead wire connected to a lamp socket to which a discharge lamp is mounted is derived from the output terminal block.

  The electrical component is mounted between the input terminal block 13 and the output terminal block of the circuit board 6, and a direct current that converts an alternating voltage into a direct current voltage by a capacitor C1, an inductor L1, and a transistor (not shown). A power supply circuit, an inverter circuit that converts a DC voltage into a high-frequency AC voltage, and a resonance circuit that applies a resonance voltage to the discharge lamp are formed. The lighting circuit 4 is disposed on the bottom surface 2 a side of the base case 2 via the first insulating sheet 3.

  The cover case 5 is made of, for example, a steel plate material, and includes a pair of side plate portions 5c and 5c and a top plate portion 5a that connects the pair of side plate portions 5c and 5c. More specifically, the cover case 5 is formed by bending a single flat plate. The cover case 5 is connected to the rectangular top plate portion 5a and both ends along the longitudinal direction of the top plate portion 5a and the top plate portion. A pair of inclined plate portions 5b and 5b that are inclined inward with respect to 5a are provided. The pair of inclined plate portions 5b and 5b are provided with a pair of side plate portions 5c and 5c that are substantially parallel to each other along the longitudinal direction thereof. Further, a pair of end plate portions 5d and 5d formed so as to be substantially orthogonal to the top plate portion 5a are connected to the top plate portion 5a at both ends in the longitudinal direction of the top plate portion 5a. The end plate portions 5d and 5d have a substantially pentagonal planar shape and substantially close the upper side of the openings 14 at both ends in the longitudinal direction of the cover case 5. The side plate portions 5c and 5c are connected to both sides along the longitudinal direction of the top plate portion 5a via the inclined plate portions 5b and 5b.

  On the one end side 5cb, 5cb and the other end side (not shown) of the pair of side plate portions 5c, 5c, a convex portion (convex toward the base case 2 side) 16 and a claw hole portion 9 are formed. Has been. The convex portion 16 is formed by pressing the outer surface 5cc of the side plate portion 5c, for example, by pressing, and protrudes from the inner surface 5cd of the side plate portion 5c to the inside of the cover case 5. The projecting surface is formed in a substantially spherical shape (elliptical shape). The convex part 16 is formed in a so-called dowel structure. The distance from the claw hole portion 9 to the convex portion 16 is set to be long enough to avoid the range of the influence of warping that occurs in the vicinity of the base portion 9a that occurs when the claw portion 9c is bent.

  When connecting the cover case 5 to the base case 2, the pair of side wall portions 2 b and 2 b of the base 2 are sandwiched between the side plate portions 5 c and 5 c of the cover case 5. As a result, the inner surfaces 5cd and 5cd of the side plate portions 5c and 5c of the cover case 5 overlap the outer surfaces of the pair of side wall portions 2b and 2b of the base case 2. And if the cover case 5 is pressed and moved to the bottom face part 2a side of the base case 2, the convex part 16 of the cover case 5 will ride on the outer surface of the side wall parts 2b and 2b.

  When the pair of side plate portions 5c and 5c overlap the pair of side wall portions 2b and 2b of the base case 2, the convex portion 16 fits into the holes 8 provided in the side wall portions 2b and 2b. At this time, the projecting surface of the convex portion 16 comes into contact with the edge portion of the substantially entire circumference of the hole 8. Thereby, the convex part 16 is firmly fixed to the hole 8 and does not move in the hole 8.

  The claw hole portion 9 is formed by cutting the outer surface 5cc of the side plate portion 5c. A claw portion 9c is formed in the claw hole portion 9 so as to face the protruding width direction of the side plate portion 5c (a direction orthogonal to the longitudinal direction of the side plate portion 5c). In a state where the cover case 5 is connected so as to cover the base case 2, the claw hole portion 9 of the cover case 5 overlaps the through hole 10 of the base case 2. Here, the claw portion 9c is folded inward from the through hole 10 by using a jig for bending the claw portion 9c by pressing a portion corresponding to the opening 15 of the claw hole portion 9 in the inner surface direction.

  When the cover case 5 is put on the base case 2, the lower end portion of the second insulating sheet 7 having an R shape arranged along the inner side of the cover case 5 is the upper end portion of the first insulating sheet 3. Covered. As a result, the circuit board 6 except for the terminal block 13 and the like is wrapped in the first insulating sheet 3 and the second insulating sheet 7 and is electrically insulated from the outside.

  A heat generating component 51 is mounted on the circuit board 6, and in the first embodiment, it has a mounting structure as shown in FIG. For example, the heat generation part of the heat generating component 51 is on the bottom side. A plurality of stud portions 31 are formed on the first insulating sheet 3 so as to protrude toward the heat generating component 51 so as to surround a region R corresponding to the bottom of the heat generating component 51 (FIG. 3).

  The stud portion 31 is formed by, for example, hot pressing or the like, and has a substantially conical shape with a small diameter from the base portion 32 toward the distal end portion 33. As shown in the plan view of FIG. 3, not all of the distances S1 to S8 between the adjacent stud portions 31 and 31 are equal, but are appropriately set depending on the shape of the necessary region R and the like.

  Among the plurality of stud portions 31, tip portions 33 of some stud portions 31 are in contact with the back surface 61 of the circuit board 6 to support the circuit board 6. Since there are a plurality of stud portions 31 for supporting the circuit board 6, the above-described substrate support step portion 22 is not necessarily required, and there is an embodiment in which the substrate support step portion 22 is not provided.

  An insulating heat radiation resin 60 is provided in the region R surrounded by the plurality of stud portions 31 and the space above the region R. The distances S1 to S8 between the adjacent stud portions 31 and 31 are set so that the insulating heat dissipation resin 60 does not flow out from the gap between the plurality of stud portions 31 and 31 when the insulating heat dissipation resin 60 is filled. ing. Since the insulating heat-dissipating resin 60 has thixotropy, the insulating heat-dissipating resin 60 does not solidify and flow out of the gaps between the plurality of stud portions 31, 31 when time passes after filling.

  With the above configuration, the necessary and sufficient insulating heat-dissipating resin 60 can be disposed and secured at a required portion, and appropriate heat dissipation can be performed for the heat generating component 51. Further, the circuit board 6 can be stably supported.

  The second embodiment has a mounting structure as shown in FIG. For example, the heat generating portion of the heat generating component 51 is on the bottom side, and the heat generating component 51 is mounted on the circuit board 6. A through-hole 62 is formed at the position of the circuit board 6 that faces the bottom, which is the heat generating portion of the heat generating component 51. An opening 52 a is provided at a position of the first insulating sheet 3 facing the back surface 61 of the circuit board 6 corresponding to the bottom area of the heat generating component 51 with the through hole 62 as the center. Except for the above configuration, the same configuration as that of the first embodiment is adopted.

  With this configuration, the same effect as the embodiment of the stand 1 by the stud portion 31 can be obtained, and the heat of the bottom portion which is the heat generating portion of the heat generating component 51 is radiated by the insulating heat radiating resin 60 and insulated. Since heat is conducted to the base case 2 through the heat-dissipating resin 60, heat can be radiated more efficiently. In the above description, the plurality of stud portions 31 are formed on the first insulating sheet 3, but may be formed on the second insulating sheet 7.

  In FIG. 5, the Example of the lighting fixture which concerns on this invention is shown. The luminaire 30 is a luminaire directly attached to a ceiling surface or the like, and a pair of lamp sockets 18 and 18 are provided at both ends of a substantially frame-like fixture body 17. A straight tube fluorescent lamp 19 as a discharge lamp is mounted on the lamp sockets 18 and 18. In addition, the instrument body 17 is provided with a reflecting plate 20 having a substantially dish-shaped cross section facing the fluorescent lamp 19, and the surface of the reflecting plate 20 is a reflecting surface 20a.

  Further, the appliance main body 17 has the discharge lamp lighting device 1 shown in FIG. 1 fixed to the mounting hole 12 provided in the bottom surface portion 2 a of the base case 2 with a screw inside the reflector 20. When the discharge lamp lighting device 1 is supplied with power, the fluorescent lamp 19 is lit.

  The lighting fixture 30 can easily secure an installation space by reducing the size of the discharge lamp lighting device 1 and can be formed at a low cost by reducing the cost of the discharge lamp lighting device 1.

2 Base case 3 First insulating sheet 5 Cover case 6 Circuit board 7 Second insulating sheet 31 Stud portion 60 Insulating heat dissipation resin

JP 2004-274018 A

Claims (3)

A base case configured in a bowl shape by a bottom surface portion and a pair of side wall portions continuous upward from both sides of the bottom surface portion;
A pair of side plates formed so as to overlap the side wall of the base case continuously from both sides of the top plate and the top plate, and the pair of side plates overlaps with the side wall of the base case An engaged cover case;
An insulating sheet disposed on the inner surface of the base case so as to be along the inner surface of the bottom surface of the base case and the inner surfaces of the pair of side walls;
An electric circuit configured by a circuit board on which an electric component including a heat generating component is mounted, and the circuit board is disposed on the bottom surface side of the base case via an insulating sheet;
A plurality of stud portions formed to protrude toward the heat generating component so as to form a required region corresponding to the heat generating component in the insulating sheet adjacent to the heat generating component;
An electric device comprising: an insulating heat dissipating resin disposed in the required region of the insulating sheet and thermally coupled to the heat generating component. The electric device according to claim 1, wherein the circuit board is supported by a tip portion of at least one stud portion. The electric device according to claim 1 or 2 used as a lighting device;
A light source to be turned on by the lighting device;
A lighting fixture comprising: a lighting device and a fixture main body on which a light source is arranged.

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