JP5434300B2 - Electrical equipment and lighting equipment - Google Patents

Description

  The present invention relates to an electrical device such as a lighting device for lighting a lighting device that emits light from various discharge lamps, light emitting elements, and the like, and a lighting device configured using the electrical device.

  2. Description of the Related Art Conventionally, in a lighting device that accommodates a wiring board on which electronic components are mounted with a metal housing member, an insulating sheet that is arranged on the inner surface of the housing member to insulate the wiring board from the housing member is used (Patent Document). 1).

  In such a lighting device, a concave portion is formed in a portion corresponding to the back surface of the wiring board on which an electronic component having a large calorific value is arranged, and the concave portion is filled with a foam heat radiating material so as to radiate heat ( Patent Document 1 mainly see FIG. 1).

  In the lighting device, electronic components are also mounted on the side referred to as the back surface of the wiring board in Patent Document 1. Some of the electronic components mounted on the back side also have a large amount of heat generation, and if the heat generation becomes excessive due to a failure or the like, the internal parts of the mold will melt and expand, causing cracks in the mold and in some cases bursting There is.

  Even in such a situation, the filling of the heat dissipation material (resin) described in Patent Document 1 is effective, and even if the mold is ruptured, the fragments are trapped in the heat dissipation material (resin) and surrounded by the surroundings. It is possible to prevent scattering and to prevent adverse effects on other parts and circuits.

  The height of the electronic component mounted on the back side varies, and if the housing member is configured with a design having a sufficient margin, a method of filling the above-described recess with a foaming heat dissipation material can be used. However, electrical devices such as lighting devices are also required to be reduced in size, and if the concave portion shown in Patent Document 1 is provided, a result contrary to the requirement for downsizing occurs. When the electrical device is downsized, the top of the electrical device, the insulating sheet, and the housing member have only a gap that is in contact with each other in a layered manner, and a configuration that includes a recess for filling the foamable heat dissipation material can be adopted. Often not.

  The present invention has been made in view of the current state of such electrical equipment, and the object thereof is to appropriately dissipate heat from the electronic components mounted on the circuit board even when the electrical equipment is downsized, and the electronic components. It is an object of the present invention to provide an electric device that can cope with the occurrence of rupture of the battery and prevent adverse effects on other components and circuits.

Electrical equipment according to the present invention includes a circuit board electronic components to supply power are mounted; and elongated base case for housing the circuit board; a above the base case in the state of enclosing the circuit board a cover case having the function of a lid that covers; provided along the inner wall surface of the base case, regions piece to protect the required electronic the required electronic components at positions corresponding to parts of the base casing side of the circuit board and its near hole is provided, characterized by comprising an insulating sheet for insulating the element and the base case and the cover case containing the electronic components of the circuit board.

  The required electronic components are relatively large in height and the distance to the base case is not limited, but generally includes heat-generating components that are 0.5 mm or less, usually about 0.1 to 0.3 mm. . It is desirable that the region piece has a shape substantially equal to the planar shape of the electronic component to be basically protected. The shape of the through-hole is not limited, but it is assumed that it is formed over 50% or more, preferably 70%, around the region piece. The through hole has, for example, a fan shape, and can be exemplified by a shape in which the region piece remains at the center of a circular virtual hole. The region piece communicates with a large part of the insulating sheet by a strip-shaped bridge path made of the insulating sheet. In addition, an element including an electronic component of a circuit board refers to an electronic component, a conductive pattern, or the like.

  The electrical device according to the present invention is characterized in that an insulating heat radiation resin is applied to the portion of the through hole.

An electric device according to the present invention, said insulating sheet is the base case is provided integrally from the inner wall surface along the inner wall surface of the cover case of the cover case and the top portion of the electronic component of the cover case side the gap, the tip portion of said insulating sheet, characterized in that it is provided with superimposed double.

The lighting apparatus according to the present invention includes an electrical device according to any one of claims 1 to 3, wherein an electronic component of a circuit board constitutes a lighting circuit of a light source, and functions as a lighting device; a light source is lighted; holding said electrical device, characterized by comprising the fixture main body are arranged above the light source.

  In the electrical device according to the present invention, the insulating sheet is provided with a region piece that protects the required electronic component at a position corresponding to the required electronic component on the base case side of the circuit board, and a through hole is provided around the region piece. While securing the heat dissipation effect by the holes, the required electronic component can be protected by this region piece, and scattering due to the mold rupture of the required electronic component can be suppressed.

  In the electric device according to the present invention, since the insulating heat radiating resin is applied to the portion of the through hole, the heat of the electronic component can be radiated through the insulating heat radiating resin and the mold of the required electronic component can be formed. By confining the fragments from the rupture in the insulating heat-dissipating resin, scattering can be prevented, and adverse effects on other components and circuits can be prevented.

  In the electrical device according to the present invention, heat is appropriately radiated without using a large-scale structure by conducting heat of the electronic component on the cover case side to the cover case through the double stacked insulating sheets. be able to.

  In the luminaire according to the present invention, heat can be appropriately radiated using an electric device that functions as a small lighting device, and safety can be improved.

The perspective view which shows the assembly state of embodiment of the electric equipment which concerns on this invention. The perspective view which shows the principal part of the insulating sheet in embodiment of the electric equipment which concerns on this invention. The top view which shows the principal part of the circuit board in embodiment of the electric equipment which concerns on this invention, and the top view which shows the state which covered the insulating sheet in the principal part, and apply | coated insulating heat dissipation resin. The top view which shows the plane of the insulating sheet in embodiment of the electric equipment which concerns on this invention. Sectional drawing which shows the cross section by the surface orthogonal to the longitudinal direction in embodiment of the electric equipment which concerns on this invention. The sectional side view which shows the mounting process of the insulating sheet used for embodiment of the electric equipment which concerns on this invention. Sectional drawing which made the cross section by the surface orthogonal to a longitudinal direction the transformer in embodiment of the electric equipment which concerns on this invention. The perspective view which shows embodiment of the lighting fixture comprised using the electric equipment which concerns on this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an electrical device according to the present invention and a lighting fixture constructed using the same will be described below with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals and redundant description is omitted. The electrical apparatus according to this embodiment is a lighting device 20 shown in FIG. 1 for lighting a lighting fixture.

  The lighting device 20 includes a base case 22, an insulating sheet 23, a lighting circuit 24, and a cover case 25 as main components. The insulating sheet 23 is disposed along the inside of the base case 22 and has an R shape corresponding to a semicircular arc along the inside of the cover case 25 when the cover case 25 is covered with the base case 22. It arrange | positions so that it may return to the base case 22 side, and the electrical connection with the metal base case 22, the cover case 25, and the lighting circuit 24 is interrupted | blocked. The lighting circuit 24 has a configuration in which the electronic component 21 is mounted on the circuit board 26. The cover case 25 has a function of a lid that covers the base case 22. The lighting circuit 24 is housed in a state of being covered with an insulating sheet 23 in a housing constituted by the cover case 25 and the base case 22.

  The base case 22 is configured to have a pair of side wall portions 22b and 22b on both sides of the bottom surface portion 22a by bending, for example, a single metal flat plate. As the metal, for example, a steel plate material is used. The bottom surface portion 22a is formed in an elongated rectangular shape. The pair of side wall portions 22b and 22b are bent upward from both sides along the longitudinal direction of the bottom surface portion 22a, and the base case 22 is entirely formed in a substantially bowl shape so as to be substantially orthogonal to the bottom surface portion 22a and facing each other. Has been.

  In the pair of side wall portions 22b and 22b, holes 8 as engagement receiving portions are formed on one end side and the other end side in the longitudinal direction as shown in FIG. The hole 8 is formed in a rectangular shape and is sized to engage with a convex portion 9 (convex toward the base case 22) that is an engaging portion of the cover case 25.

  Furthermore, in the pair of side wall portions 22b and 22b, it is sandwiched between small rectangular strips on one end side and the other end side in the longitudinal direction, and protrudes in an R shape inward as shown in FIG. A substrate support step 22ba on which the circuit board 26 is placed is formed. A total of four board support steps 22ba support the circuit board 26. The insulating sheet 23 is bent corresponding to the substrate support step 22ba to form a step 23d. The bottom surface portion 23t of the insulating sheet 23 is along the bottom surface portion 22a of the base case 22, and an inclined portion 23k extending from the bottom surface corner portion to the step portion 23d is pushed downward by the substrate support step portion 22ba. 23 is stably disposed on the bottom surface portion 22a.

  The insulating sheet 23 is made of an insulating resin having a flat shape, such as polyethylene terephthalate (PET), and is arranged inside along the inner surfaces of the base case 22 and the cover case 25. The thickness of the insulating sheet 23 is, for example, 0.2 to 1.0 mm.

  The lighting circuit 24 is configured by mounting electronic components on a circuit board 26. The circuit board 26 is made of, for example, a glass epoxy material or a paper phenol material, and is formed in a rectangular shape. The longitudinal dimension of the circuit board 26 is somewhat larger than the longitudinal dimension of the side wall portion 22b of the base case 22. Designed small.

  Furthermore, on the upper surface 26a of the circuit board 26, an input terminal block 13a is disposed on one end side 26b, and an output terminal block 13b is disposed on the other end side. A power supply line from a commercial AC power supply is connected to the input terminal block 13a, and a lead wire for supplying power to the light source is led out from the output terminal block 13b.

  The electronic component 21 is mounted between the input terminal block 13a and the output terminal block 13b of the circuit board 26, and is supplied with an AC voltage by a capacitor C1, an inductor L1, and a transistor TR and a transformer T (not shown). Are formed, a DC power supply circuit that converts the DC voltage into a DC voltage, an inverter circuit that converts the DC voltage into a high-frequency AC voltage, and a circuit that applies a driving voltage to the light source.

  The cover case 25 is made of, for example, a steel plate material, and includes a pair of side plate portions 25c and 25c and a top plate portion 25a that connects the pair of side plate portions 25c and 25c. More specifically, the cover case 25 is configured by bending a single flat plate. The cover case 25 is connected to the rectangular top plate portion 25a and both ends along the longitudinal direction of the top plate portion 25a and the top plate portion. A pair of inclined plate portions 25b and 25b that are inclined inward with respect to 25a are provided. A pair of side plate portions 25c and 25c facing each other substantially parallel to each other along the longitudinal direction is connected to the pair of inclined plate portions 25b and 25b.

  Further, as shown in FIG. 1, at both ends in the longitudinal direction of the top plate portion 25a, a pair of end plate portions 25e and 25e formed so as to be substantially orthogonal to the top plate portion 25a are formed on the top plate portion 25a. It is connected continuously. The end plate portions 25e and 25e 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 25. The lower end portions of the end plate portions 25e and 25e have a function of pressing down the circuit board. When the cover case 25 is attached to the base case 22 from above, the end plate portions 25e and 25e enclose the electronic component 21 with the terminal blocks 13a and 13b left outside, and press the circuit board 26. Become. The side plate portions 25c and 25c are connected to both sides along the longitudinal direction of the top plate portion 25a via the inclined plate portions 25b and 25b.

  Further, the cover case 25 is formed in such a size that its longitudinal direction is located between the input terminal block 13a and the output terminal block 13b disposed on the circuit board 26. Further, when the cover case 25 is fitted to the base case 22, the height dimensions of the side plate portions 25c, 25c (the height of the bottom plate portion 2a of the base case 22 and the bottom edge 2a of the base case 22 coincide with each other). The height dimension of the cover case 25 is set. Further, the distance between the side plate portions 25c and 25c is set so that the inner surfaces of the pair of side plate portions 25c and 25c overlap the outer surfaces of the pair of side wall portions 22b and 22b of the base case 22 and are thermally coupled to each other. . The cover case 25 has elasticity as a whole. When the cover case 25 is deformed so as to expand with respect to the pair of side plate portions 25c, 25c, a force is applied to elastically restore the original shape.

  When connecting the cover case 25 to the base case 22, the pair of side wall portions 22 b and 22 b of the base case 22 are sandwiched between the side plate portions 25 c and 25 c of the cover case 25. Thereby, the inner surfaces of the side plate portions 25c, 25c of the cover case 25 and the outer surfaces of the pair of side wall portions 22b, 22b of the base case 22 come into contact with each other and overlap each other. And if the cover case 25 is pressed and moved to the bottom face part 22a side of the base case 22, the convex part 9 of the cover case 25 will ride on the outer surface of the side wall parts 22b and 22b.

  When the pair of side plate portions 25 c and 25 c overlap the pair of side wall portions 22 b and 22 b of the base case 22, the convex portion 9 is fitted into the hole 8 provided in the side wall portions 22 b and 22 b. At this time, the projecting surfaces of the projections 9 abut against both lateral edges of the hole 8. Thereby, the convex portion 9 is firmly fixed to the hole 8 and does not move in the hole 8.

  As already described, electronic components for constituting the lighting circuit 24 are mounted on the base case 22 side of the circuit board 26, as shown in FIG. The electronic component D whose top is very close to the base case 22 is provided. The electronic component D is, for example, an electronic component that forms a rectifier circuit, and the planar shape of the mold portion is rectangular.

  Therefore, in the present embodiment, as shown in FIG. 2 at the position corresponding to the electronic component D in the insulating sheet 23, the plurality of through holes 12 are provided around the region piece 11 that protects the electronic component D and the vicinity thereof. Form. The through-holes 12 are, for example, fan-shaped, and four holes are formed at positions where they form an angle of 90 degrees so that the region piece 11 remains in the center of the circular virtual hole. The region piece 11 is configured to communicate with a large portion of the insulating sheet 23 by a strip-shaped bridge path 13 formed by the insulating sheet 23.

  On the base case 22 side of the circuit board 26, an electronic component Ds that generates heat having a height dimension lower than that of the electronic component D is provided as shown in FIG. 3A, and an insulating sheet 23 corresponding to the electronic component Ds is provided. A circular hole 16 is formed at the position as shown in FIGS. The insulating heat radiation resin 15 is applied to the through holes 12 and the holes 16 from the base case 22 side of the insulating sheet 23 as shown in FIG.

  In the hole 16, the insulating heat radiating resin 15 thermally communicates the electronic component and the base case 22 at the portion of the hole 16. On the other hand, the distance between the electronic component D and the base case 22 is about 0.1 to 0.3 mm, and the insulating heat radiation resin 15 hardly adheres to the front and back surfaces of the region piece 11. As shown in FIG. 5, the insulating heat-dissipating resin 15 adheres to the peripheral portion of the electronic component D on the circuit board 26 to prevent the mold from being broken when the electronic component D is ruptured. Further, the insulating heat radiation resin 15 functions so as to be thermally coupled to the electronic component D and the base case 22 and can ensure proper heat radiation. As described above, according to the electrical apparatus according to the present embodiment, the insulating heat radiation resin 15 is applied to the portion of the through hole 12, and thus the electronic component D is radiated through the insulating heat radiation resin 15. In addition, it is possible to prevent scattering of the electronic part D due to the rupture of the mold in the insulating heat radiating resin 15 and prevent adverse effects on other parts and circuits.

  By the way, in the state in which the lighting device 20 is assembled, the dimension is set so that the tip portion of the insulating sheet 23 is doubled on the top plate portion 25a of the cover case 25. When the cover case 25 is not covered, a corner 23c is formed by a fold line 23j at a predetermined distance of about several centimeters from the tip on one side of the insulating sheet 23, and a region on the tip side from the fold line 23j. Is folded inward.

  For this reason, when assembling so as to cover with the cover case 25, the top plate portion 25a of the cover case 25 abuts on the front end portions 23L and 23R of the insulating sheet 23, and the upper portion is folded into an arc as a whole. (Fig. 6 (a), Fig. 6 (b)). Further, as the pressing progresses, the corner 23c formed by the folding line 23j comes into contact with the top plate 25a of the cover case 25, the distal end 23R moves away from the top plate 25a, and the tip side region and the ceiling from the folding line 23j. A gap is generated between the plate portion 25a.

  Further, as the pressing progresses, the leading end portion 23L of the insulating sheet 23 enters the gap, and the leading end portion of the insulating sheet 23 is doubled on the top plate portion 25a of the cover case 25 (FIG. 6 ( c)).

  As already described, in addition to the input terminal block 13a, the capacitor C1, and the inductor L1, the transformer T, the power transistor TR, the output terminal block 13b, and other electronic components 21 are mounted on the circuit board 26. Here, since the component having a high height is the transformer T, as shown in FIG. 7 which is a cross-sectional view taken along a plane parallel to the end plate portion 25e of the cover case 25 including the transformer T, the double sheet of the insulating sheet 23 is used. The overlapping portion W fills the gap between the top surface of the core TC of the transformer T and the cover case 25 so that the core TC and the cover case 25 are brought into contact with each other. With this configuration, the heat generated by the transformer T is transferred to the cover case 25 via the insulating sheet 23, so that heat is appropriately radiated. Since the lighting device 20 including the cover case 25 is connected to the fixture main body 37, the heat of the lighting device 20 can be radiated from the fixture main body 37.

  Here, since the two transformers T are mounted, if the heights of the mounted transformers T and T do not match, the insulating sheet 23 and the heat dissipation are disposed between the core TC of the transformer T and the cover case 25. By interposing a sheet or the like, the gap between the core CT of the transformer T and the cover case 25 is absorbed to ensure the connection between the transformer T and the cover case 25.

  FIG. 8 shows an embodiment of a lighting fixture according to the present invention. The luminaire 30 is a luminaire directly attached to a ceiling surface or the like, and a pair of lamp sockets 38 and 38 are provided at both ends of a substantially frame-shaped fixture body 37. In the lamp sockets 38, 38, straight tube fluorescent lamps 39 as discharge lamps as light sources are arranged. In addition, the instrument body 37 is attached with a reflecting plate 35 having a substantially dish-shaped cross section so as to face the fluorescent lamp 39, and the surface of the reflecting plate 35 is a reflecting surface 35a.

  Further, the appliance main body 37 is provided with a screw passing through the mounting hole 36 provided in the bottom surface portion 22a of the base case 22 shown in FIG. It is fixed. When the discharge lamp lighting device 20 is supplied with power, the fluorescent lamp 39 is lit.

  The lighting fixture 30 can be easily secured by reducing the size of the lighting device 20 of the discharge lamp, and can be formed inexpensively by reducing the cost of the lighting device 20 having the safety as described above. Can do.

DESCRIPTION OF SYMBOLS 11 Area piece 12 Through-hole 15 Insulating heat radiation resin 20 Lighting device 21 Electronic component 22 Base case 23 Insulating sheet 24 Lighting circuit 25 Cover case 26 Circuit board 30 Lighting fixture 37 Appliance main body

JP 2004-274018 A

Claims (4)

A circuit board on which electronic components for supplying power are mounted;
A long base case for storing the circuit board;
A cover case having the function of a lid for covering the upper side of the base case in the state of enclosing the circuit board;
Wherein provided along the inner wall surface of the base case, the required electronic components through hole in a region strip and the vicinity thereof to protect is provided at a position corresponding to the required electronic components of the base casing side of the circuit board, said circuit electrical apparatus characterized by comprising an insulating sheet for insulating the element comprising a substrate said electronic component and said base case and the cover case.   The electrical apparatus according to claim 1, wherein an insulating heat-dissipating resin is applied to the portion of the through hole. The insulating sheet is provided integrally along the inner wall surface of the cover case from the inner wall surface of the base case, the gap between the electronic component of the top portion and the cover case of the cover case side, of the insulating sheet The electric device according to claim 1 or 2, wherein the tip portion is provided so as to be doubled. The electric device according to any one of claims 1 to 3, wherein an electronic component of the circuit board constitutes a lighting circuit of a light source and functions as a lighting device;
A light source that is turned on by this electrical device;
Luminaire, wherein the holding electrical equipment, comprising a fixture main body are arranged above the light source.

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