JP2009110879A - Closed circuit device and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closed circuit device which includes a circuit unit housed in a closed case and has a simple structure enabling grounding connection. <P>SOLUTION: The closed circuit device 100 includes the circuit unit 10 and the closed case unit 20. The circuit unit 10 has a circuit board 11, a case body 12 connected conductively to the circuit board 11, and a cover 15 connected conductively to the circuit board 11. Projections 14 are formed on enclosures 13a and 13b of the case body 12, respectively. The closed case unit 20 has a closed case 21, a closed packing 24, and a blocking plate 22. The circuit unit 10 is housed in the closed case 21 while the projections 14 scrape the inner wall of the closed case 21. Once housed in the closed case 21, the projections 14 are put in a state of pressure contact with the inner wall of the closed case 21, and thus connected conductively to the closed case 21. The blocking plate 22 is connected conductively to the closed case 21. By the projections, a grounding path is formed of the circuit board 11, the case body 12, the closed case 21, and the blocking plate 22 in a simple structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sealed circuit device that protects a circuit device housed from water, dust, and oil by a sealed structure and that is electrically connected to the circuit device, and a lighting fixture that includes the sealed circuit device.

  Waterproofing measures are required for lighting fixtures installed outdoors and lighting fixtures installed indoors such as bathrooms and food factories even when installed indoors. Also, dust-proof measures are required against dust. For example, in a factory, depending on the environment, there may be a place where oily smoke or a lot of dust exists. In lighting fixtures installed in such places, it is necessary to protect electrical components such as lighting circuit components. In such a case, the lighting circuit (circuit device) is housed in a sealed housing case, and this housing case is attached to the luminaire body (for example, Patent Document 1).

  In addition, in the case of an electric appliance in which a voltage of 150 V or more is applied to the electric component, it is obliged to ground the electric component according to the standard. Normally, when electrical components are connected to ground, a structure in which a ground wire is directly connected to the electrical component and the ground wire is pulled out of the sealed case, or a structure in which the sealed case and the electrical component are secured with a ground screw (Patent Document 1) is adopted. Has been.

  In addition, in lighting fixtures with built-in lighting devices, the noise terminal voltage generated from the equipment is obliged to be suppressed to 55 dB or less in the frequency range of 30 MHz to 300 MHz, which affects other equipment. It is more desirable that the above value is low so that malfunction does not occur.

  Increasing the grounding mechanism and grounding point has the effect of lowering the noise terminal voltage. However, as a method of electrically connecting the sealed case and the circuit device, a structure in which the ground wire is pulled out of the sealed case, or a ground screw The structure to stop with has been taken. However, these have a complicated structure, a large number of parts, and a heavy burden for assembling the equipment.

That is, in the case of the conventional structure, there is a problem that the structure becomes complicated when electrically connected to the sealed case containing the lighting device.
Japanese Patent Laid-Open No. 9-246739

  An object of the present invention is to provide a hermetic circuit device capable of ground connection with a simple structure to an electric circuit housed in a hermetically sealed case.

The sealed circuit device of the present invention is
A circuit device having a substrate support that supports a circuit board on which a circuit used in a lighting fixture is formed and is electrically connected to the circuit board and has a convex portion formed on an outer shell;
A storage case main body in which the circuit device is stored, and a closing plate which is attached to the storage case main body and closes the opening of the storage case main body and is electrically connected to the storage case main body, and has a mounting hole A sealed case device having a closing plate formed with a protrusion,
The circuit device comprises:
When the convex portion of the substrate support is kept in contact with the inner wall of the storage case main body in the state of being stored in the sealed case device, it is electrically connected to the storage case main body.

  According to the present invention, it is possible to provide a hermetic circuit device capable of ground connection with a simple structure to an electric circuit housed in a hermetic case.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS. The first embodiment relates to a sealed circuit device 100 including a circuit device 10 used for a lighting fixture and a sealed case device 20 that houses the circuit device 10. A feature of the hermetic circuit device 100 is that when the circuit device 10 is hermetically sealed, a ground connection can be made with a simple structure. By adopting a simple ground connection structure, it is possible to reduce the product cost, the assembly burden, the circuit noise, and the like. As will be described later, by providing the convex portion 14 on the case body 12, in FIG. 1, the path of ground connection is as follows: circuit board 11 → case main body 12 (convex portion 14) → sealed case 21 → blocking plate 22
It becomes. As will be described later in the second embodiment, the grounding is taken from the closing plate 22 through a terminal attached to the luminaire body or the protrusion 23.

  FIG. 1 is an exploded perspective view of the hermetic circuit device 100. FIG. 2 is an exploded perspective view of the circuit device 10 housed in the sealed case device 20. FIG. 3 shows an arrow A in a state in which the sealing packing 24 and the closing plate 22 are not attached when the circuit device 10 is accommodated in the sealing case 21 in FIG. 1. The hatching in FIG. 3 represents the end surfaces of the case body 12 and the sealed case 21. The configuration of the sealed circuit device 100 will be described with reference to FIGS. A feature of the hermetic circuit device 100 is that when the circuit device 10 is hermetically sealed, a ground connection can be made with a simple structure.

(Configuration of Sealed Circuit Device 100)
As shown in FIG. 1, the sealed circuit device 100 includes a circuit device 10 and a sealed case device 20 that houses the circuit device 10. The circuit device 10 includes a case main body 12 (board support portion) having a circuit board 11 and a cover 15 (board cover) that is attached to the case main body 12 and covers the circuit board 11. The sealed case device 20 includes a sealed case 21 (storage case main body), a sealed packing 24 that closes the openings on both sides of the sealed case, and an end portion of the sealed case 21 at the opening. And a closing plate 22 that closes the portion 26. The closing plate 22 is attached to the sealed case 21 with screws 25. The case body 12, the cover 15, the sealing case 21, the closing plate 22, the screw, the nut, and the washer are all conductive materials.

(1) Circuit device 10.
First, details of the circuit device 10 will be described.
(1.1) Case body 12:
The case body 12 supports a circuit board 11 on which a circuit used for a lighting fixture is formed, is electrically connected to the circuit board 11, and has a convex portion 14 formed on the outer shell 13. As shown in FIG. 2, the case main body 12 is a thin plate that is bent in a direction in which both end portions along the longitudinal direction rise. In the case main body 12, both bent ends form outer shells 13a and 13b, respectively, and the circuit board 11 is supported (fixed) between the outer shells 13a and 13b. In addition, when there is no need for distinction, the outline may be referred to as “exterior 13”. The circuit formed on the circuit board 11 corresponds to a lighting circuit for lighting a discharge lamp, a lighting circuit for lighting an incandescent lamp, a lighting circuit for lighting a light emitting diode, or the like. In FIG. 2, a transformer, a capacitor electronic component, and a terminal are illustrated on the circuit board 11. In the case body 12, the convex portion 14 is supported by the back surface 19 a of the outer surface 13 a with respect to the surface 18 on the circuit board 11 side, the rear surface 19 b of the other outer surface with respect to the surface of the circuit board, and the circuit board 11. It is formed on at least one of the surfaces 19c, which is the back surface of the surface 18 that is present. The case body 12 supports the circuit board 11 in a fixed manner. As shown in FIG. 3, the circuit board 11 is fixedly supported on the case main body 12 by screws 17. The case body 12 is “electrically conductive” with the circuit board 11 by the screw 17. In the following description, “electrically conductive” is simply referred to as “conductive”. When the circuit device 10 including the case body 12 is accommodated in the sealed case 21, the projecting portion 14 keeps contact with the inner wall of the sealed case 21, whereby the sealed case 21 and the circuit device 10 are electrically connected. That is, the convex portion 14 conducts along the path of the circuit board 11 → the case main body 12 → the sealed case 21.

(2. Sealed case device 20)
Next, details of the sealed case device 20 will be described.
(2.1) Sealed case 21:
The sealed case 21 in which the circuit device 10 is housed is a hollow member having openings 26 at both ends. The sealed case 21 is an extruded material of aluminum, for example. As shown in FIG. 3, the storage width dimension W <b> 1 of the circuit device 10 is slightly larger than the corresponding width dimension W <b> 2 corresponding to the storage width dimension W <b> 1 in the sealed case 21. When the circuit device 10 is housed in the sealed case 21, the projecting portion 14 slides while scraping the inner wall of the sealed case 21, so that the circuit device 10 is housed in the sealed case 21. Therefore, the convex portion 14 of the case body 12 is in pressure contact with the inner wall of the sealed case 21 in the state of being housed in the sealed case 21.
(2.2) Sealing packing 24 and closing plate 22:
When the circuit device 10 is housed in the sealed case 21, the circuit device 10 is sealed by the sealed packing 24. Then, the opening 26 of the sealed case 21 is closed by the closing plate 22. That is, the closing plate 22 is attached to the opening 26 of the sealing case 21 sealed with the sealing packing 24 and closes the opening 26 of the sealing case 21. The closing plate 22 is attached to the sealed case 21 by screwing the screw 25 into a female screw 28 formed in the sealed case 21. Further, the closing plate 22 is formed with a projection 23 having a mounting hole 27 formed therein. Since the closing plate 22 is made of a conductive material, the conduction route formed by the convex portion 14 as the circuit board 11 → the case body 12 → the sealed case 21 extends from the sealed case 21 to the closing plate 22.

(Position where the convex portion 14 is formed)
3-8 is a figure explaining the variation of the position in which the convex part 14 is formed. In FIGS. 3 to 8, the convex portion is surrounded by a broken line. When the convex portion 14 is formed on the outer shell 13, in FIG. 3 and the like, it is assumed that the longitudinal position of the outer portion of the convex portion 14 is formed at the position of FIG.

  FIG. 3 shows a case where the convex portion 14 is formed on the outer shell 13a. The sealed case 21 is usually made of an extruded aluminum material. The aluminum material is difficult to conduct because the surface is anodized or painted. Even when the surface is not treated, the aluminum material is difficult to conduct because an oxide film is formed on the surface. Therefore, when the convex portion 14 is housed in the case main body 12, the coating and the coating on the inner wall of the sealed case 21 are scraped by sliding to enable conduction.

  FIG. 4 shows a case where the convex portion 14-1 is formed on the surface 19 c of the case body 12. In this case, the storage height dimension H1 of the circuit device 10 (case body 12) is slightly larger than the corresponding height dimension H2 corresponding to the storage height dimension H1 in the sealed case 21. When the circuit device 10 is housed in the sealed case 21, the convex portion 14-1 in FIG. 4 slides while scraping the inner wall of the sealed case 21, so that the circuit device 10 is housed in the sealed case 21. Therefore, the convex portion 14-1 of the case body 12 is in pressure contact with the inner wall of the sealed case 21 in the state of being stored in the sealed case 21. Thereby, the circuit device 10 and the sealed case 21 are electrically connected. Moreover, the contact surface with the airtight case 21 increases by providing the convex part 14-1. That is, the adhesion between the upper portion of the cover 15 surrounded by the dotted line A and the sealed case 21 is improved. For this reason, the heat dissipation effect can be enhanced, and at the same time, rattling can be prevented.

  FIG. 5 shows a case where convex portions 14 are formed on the outer shell 13a and the outer shell 13b on both sides, respectively (two in total). In this case, since the convex portion 14 is increased by one, the certainty of conduction is increased as compared with FIG.

  FIG. 6 is a diagram illustrating a case where the convex portion 14-2 is formed on the cover 15. The cover 15 covers the circuit board 11 and is electrically connected to the case main body 12, and a convex portion 14-2 is formed. The cover 15 is electrically connected to the case main body 12 by fitting with the case main body 12 by the convex portion 1 formed for fitting with the case main body 12 or by fastening with the case main body 12 by screwing. The cover 15 and the sealed case 21 are electrically connected by the convex portion 14-2.

  FIG. 7 shows a case where the convex portion 14-2 of FIG. 6 is further added to the case where the two convex portions 14 of FIG. 5 are provided. By providing the convex portion 14-2 on the cover, an effect of increasing the adhesion between the back surface (surface 19 c) of the case body 12 and the inner surface of the sealed case 21 is obtained.

  8 and 9, the convex portion 14 is formed on one side (one outer shell 13 a) of the case body 12, and the cover 15 is placed inside the outer shell of the case body 12. Since the sealed case and the case are in contact with each other, a higher heat dissipation effect can be obtained. That is, the case main body 12 corresponds to the outer shells 13a and 13b and has end portions having predetermined plane portions, and the outer surfaces of the respective end portions are in contact with the inner surfaces of the corresponding outer shells 13a and 13b. As a result, the heat dissipation effect is improved.

(Variation of convex shape)
10-13 is a figure which shows the variation of a convex part shape. As for the position in the longitudinal direction of the contour of the convex portion, the case of FIG. 2 is assumed. Each figure shows an arrow view.

  The convex portion 14 in FIG. 10 has a shape in which a substantially semicircular hollow cross section gradually decreases in the longitudinal direction of the outer shell 13. The convex part 14 of FIG. 11 is a shape where the substantially triangular hollow cross section gradually decreases as it goes in the longitudinal direction of the outer shell 13a. The convex portion 14 in FIG. 12 is a shape in which the plate pieces are attached obliquely with respect to the longitudinal direction of the outer shell 13a (so that the two plate pieces that become the convex portions are “shaped” as viewed in the direction of arrow C). It is. The convex portion 14 in FIG. 13 has a plate piece in a direction opposite to the standing direction and in an oblique direction with respect to the outer shell 13 standing substantially vertically (see the arrow A in FIG. It is a shape attached so that it becomes a “C”.

(Direction of convex part)
FIG. 14 is a diagram illustrating the direction of the convex portion. FIG. 14A is a diagram (corresponding to a front view) illustrating the internal circuit device 10 with the sealed case 21 as a cross section in the sealed circuit device 100. FIG. 14B is a plan view corresponding to FIG. 14A for showing the circuit device 10 inside the sealed case 21. Moreover, FIG.14 (c) is a figure corresponded in the left view with respect to Fig.14 (a). That is, although the shape of the convex portion has been described with reference to FIGS. 10 to 13, when two or more convex portions (including those formed on the outer shell, the surface 19 c and the cover 15) are formed, the direction of the convex portion is As shown in FIG. 14, they are aligned in the same direction. This is to make it easy to insert the circuit device 10 into the sealed case 21.

  As described above, the sealed circuit device 100 according to the first embodiment conducts by the convex portion formed on the case main body 12 or the convex portion formed on the cover 15, so that the ground connection structure is simplified, and the product It is possible to reduce costs, reduce the assembly burden, reduce circuit noise, and the like.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS. The second embodiment is an embodiment of a lighting fixture including the sealed circuit device 100 of the first embodiment.

  FIG. 15 is a perspective view showing a state in which the sealed circuit device 100 is conducted to the lighting fixture main body 300 and fixed. In the second embodiment, it is assumed that the circuit board 11 is formed with a discharge lamp lighting circuit. The sealed circuit device 100 is attached to the luminaire main body 300 by screws 51, nuts 52, washers 53, and the like. These screws 51, nuts 52, and washers 53 are made of a conductive material. Since the luminaire main body 300 is a galvanized steel plate, the luminaire main body 300 is electrically connected to the sealed circuit device 100. That is, a conduction route of circuit board 11 → case main body 12 → sealed case 21 → blocking plate 22 (projecting portion 23) → luminaire main body 300 is formed. Further, as shown in FIG. 15, the round terminal 30 is attached to the protruding portion 23 of the closing plate 22. The user can ground from the round terminal 30 if necessary. A reverse Fuji-shaped reflector 200 is attached to the luminaire main body 300 to which the sealed circuit device 100 is attached, and the luminaire 1000 is constituted by these.

  FIG. 16 is a perspective view of the lighting apparatus 1000. FIG. 17 is a cross-sectional view taken along the line AA in FIG. FIG. 17 shows a case where cutting is performed between the closing plate 22 and the case main body 12.

  Since the lighting fixture 1000 of the second embodiment includes the sealed circuit device 100, in addition to preventing moisture and dust from entering the circuit device 10, the ground connection structure can be simplified to reduce the lighting fixture cost and to assemble the lighting fixture 1000. The burden can be reduced and circuit noise can be reduced. Regarding the reduction of the circuit noise, an improvement of about 5 db was actually observed in the range of 20 MHz to 30 MHz.

FIG. 3 is an exploded perspective view of the sealed circuit device 100 according to the first embodiment. 1 is an exploded perspective view of a circuit device 10 according to a first embodiment. FIG. 4 is a diagram illustrating a convex portion position according to the first embodiment. FIG. 4 is a diagram illustrating a convex portion position according to the first embodiment. FIG. 4 is a diagram illustrating a convex portion position according to the first embodiment. FIG. 4 is a diagram illustrating a convex portion position according to the first embodiment. FIG. 4 is a diagram illustrating a convex portion position according to the first embodiment. FIG. 4 is a diagram illustrating a convex portion position according to the first embodiment. The figure which shows attachment of the cover and case main body of Embodiment 1. FIG. FIG. 3 is a diagram showing the shape of a convex portion in the first embodiment. FIG. 3 is a diagram showing the shape of a convex portion in the first embodiment. FIG. 3 is a diagram showing the shape of a convex portion in the first embodiment. FIG. 3 is a diagram showing the shape of a convex portion in the first embodiment. FIG. 3 is a diagram illustrating directions of convex portions according to the first embodiment. FIG. 6 is an exploded perspective view of a lighting fixture according to Embodiment 2. FIG. 6 is a perspective view of a lighting fixture according to Embodiment 2. AA sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 convex part, 10 circuit apparatus, 11 circuit board, 12 case main body, 13, 13a, 13b outline, 14, 14-1, 14-2 convex part, 15 cover, 16 lead wire, 17 screw, 18 side, 19a, 19b, 19c surface, 20 sealed case device, 21 sealed case, 22 closing plate, 23 protrusion, 24 sealed packing, 25 screw, 26 opening, 27 mounting hole, 28 female screw, 30 round terminal, 51 screw, 52 nut 53 Washer 100 Sealed circuit device 200 Reflector plate 300 Lighting fixture body 1000 Lighting fixture

Claims (8)

A circuit device having a substrate support that supports a circuit board on which a circuit used in a lighting fixture is formed and is electrically connected to the circuit board and has a convex portion formed on an outer shell;
A storage case main body in which the circuit device is stored; and a sealed case device that is attached to the storage case main body and closes an opening of the storage case main body and has a closing plate that is electrically connected to the storage case main body. ,
The circuit device comprises:
A sealed circuit device, wherein the convex portion of the substrate support is kept in contact with an inner wall of the storage case body in a state of being stored in the sealed case device, thereby being electrically connected to the storage case body. The convex portion of the substrate support is
The sealed circuit device according to claim 1, wherein the sealed circuit device is in pressure contact with the inner wall of the storage case body. The substrate support is
The thin plate is bent in the direction in which both end portions along the longitudinal direction are raised, and both the bent end portions form the outline, and the circuit board is supported between the outlines.
In the substrate support, the convex portion is
A back surface with respect to the surface on the side of the circuit board in one of the outer shells;
A back surface with respect to the surface on the side of the circuit board in the other outline;
3. The hermetic circuit device according to claim 1, wherein the hermetic circuit device is formed on at least one of a back surface with respect to a surface located between the outer shells on both sides. A substrate support that supports a circuit board on which a circuit used in a lighting fixture is formed and is electrically connected to the circuit board; and that covers the circuit board and is electrically connected to the substrate support; and a convex portion is formed. A circuit device having a substrate cover;
A storage case main body in which the circuit device is stored; and a sealed case device that is attached to the storage case main body and closes an opening of the storage case main body and has a closing plate that is electrically connected to the storage case main body. ,
The circuit device comprises:
The sealed circuit device, wherein the convex portion of the substrate cover is kept in contact with the inner wall of the storage case body in a state of being stored in the sealed case device, thereby being electrically connected to the storage case body. The circuit device comprises:
5. The sealed circuit device according to claim 1, wherein the convex portion slides on an inner wall of the storage case main body and is stored in the storage case. The closing plate is
6. The hermetic circuit device according to claim 1, wherein a projection having a mounting hole is formed. The circuit used in the luminaire is
The sealed circuit device according to claim 1, wherein the sealed circuit device is a lighting circuit for lighting a light source. A sealed circuit device according to any one of claims 1 to 7,
A lighting fixture comprising: a lighting fixture main body that is electrically connected to the attached sealed circuit device while the sealed circuit device is attached through the hole of the protrusion of the sealed circuit device.

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