JP4375063B2 - Discharge lamp lighting device and lighting fixture - Google Patents

Description

  The present invention relates to a discharge lamp lighting device for lighting a discharge lamp such as a fluorescent lamp, and a lighting fixture such as a fluorescent lamp lighting fixture provided with the device.

A discharge lamp lighting device incorporated in a lighting fixture used outdoors or in a high humidity environment is required to be waterproof. For this purpose, a case for accommodating a printed wiring board on which various electrical components are mounted is formed with two upper and lower groove shapes, and the engaging portions extending in the longitudinal direction between these groove shapes are hardened like a silicone adhesive. Adhesive with a waterproof and waterproof adhesive, both end openings of the case thus assembled are closed with rubber end plates, and the periphery of these end plates is used with a curable and waterproof adhesive A fluorescent lamp electronic ballast that is waterproofed by bonding to an opening of a case is known (for example, see Patent Document 1).
CD-ROM (paragraphs 0007, 0010-0013, FIGS. 1 to 7) of Japanese Utility Model No. 5-6055 (Japanese Utility Model Application No. 6-60179)

  In the technique of Patent Document 1 that uses a case for waterproofing, in addition to adhering end plates to the case, two parts need to be bonded in order to assemble the upper and lower groove shapes into a case. Adhesion accompanied by the assembly of this case is time consuming and disadvantageous in improving the manufacturability, so that improvement is required. In addition, in the configuration where waterproofing is performed using an adhesive, the more bonding points for waterproofing, the higher the probability that adhesion failure will occur and the waterproof performance will be impaired.

  An object of the present invention is to provide a discharge lamp lighting device that is easy to manufacture and can improve the reliability of waterproofing, and a lighting fixture including the device.

  In order to solve the above-mentioned problem, the discharge lamp lighting device according to the invention of claim 1 is provided with various types of electrical components in which plug-type wire connectors are mounted at both ends and a discharge lamp lighting circuit is formed between these connectors. A printed wiring board on which is mounted; a waterproof member made of a soft material into which an electric wire inserted into the electric wire connector is inserted in a liquid-tight manner, and a pair of end members provided to accommodate the ends of the printed wiring board; A waterproof cylinder in which the peripheral wall has a liquid-tight structure and has both ends opened to accommodate a printed wiring board, and both the opened ends are liquid-tightly fitted to a pair of end members; Is provided.

  In the present invention and the following invention, the plug-in type electric wire connector has a locking portion for locking the electric conductor by inserting the electric conductor forming the core of the electric wire. It refers to a connector having a function of electrically and mechanically connecting conductors. In this invention and the following invention, the peripheral wall of the waterproof cylinder has a liquid-tight structure. The peripheral wall has a structure formed integrally without a seam in the circumferential direction, or there is a seam, but the seam Although the waterproof tape is bonded and has a similar configuration where there is substantially no seam, or the side edges that become the seam overlap each other and are pre-adhered and have a similar configuration without a substantial seam, etc. In addition, it does not include a form in which the side edges serving as the seams simply overlap each other and form a cylindrical shape. In the present invention and the following invention, the waterproof cylinder should be a thin film that can be elastically deformed to facilitate weight reduction and containment of the printed wiring board inside, and close to the end member. However, the present invention is not limited to this, and it may be hard. Furthermore, it is preferable that the waterproof cylinder has insulating properties in order to reduce the number of parts. However, the waterproof cylinder is not limited to this, and if it does not have insulating properties, a film-like insulating member should be used inside the waterproof cylinder. Is possible. In this invention and the following invention, the waterproof cylinder is liquid-tightly fitted to the end member means that the outer peripheral surface or inner peripheral surface of the end member is fitted to the end of the waterproof cylinder fitted thereto. For example, in addition to the configuration described in the embodiments described later, it can be realized by fixing the end of the waterproof cylinder to the end member with an adhesive or the like. The end member may be entirely waterproof or partly waterproof.

  In the first aspect of the invention, the waterproof cylinder itself is waterproof except for the opening at both ends thereof, so that both end portions of the waterproof cylinder containing the printed wiring board are fitted into the end members in a liquid-tight manner. The printed wiring board can be reliably waterproofed only by this. As a result, the number of places where a waterproof failure may occur due to a decrease in the number of places requiring waterproof measures, the probability that the waterproof performance is impaired can be lowered, and the productivity can be improved.

  In order to solve the above-mentioned problems, the discharge lamp lighting device according to the invention of claim 2 is provided with various types of plug-type electric wire connectors mounted at both ends and a discharge lamp lighting circuit between these connectors. A pair of ends provided with a printed wiring board on which electrical components are mounted; a waterproof member made of a soft material into which an electric wire inserted into the electric wire connector is inserted in a liquid-tight manner, and accommodating an end of the printed wiring board A member having a cylindrical shape in which the peripheral wall has a liquid-tight structure and both ends are opened, accommodates a printed wiring board, and the both opened ends are liquid-tightly fitted to a pair of end members A cylinder; a base case that houses a circuit module assembled by a printed wiring board, a pair of end members, and a waterproof cylinder; and a case body that covers the circuit module and is combined with the base case to form a case body It is provided with; in a cover case having a holding portion which sandwiched between the base case a pair of end members.

  In this invention, since the circuit module assembled by the printed wiring board of Claim 1, a pair of end member, and a waterproof cylinder is provided, the subject of this invention can be solved. In addition, since the circuit module is accommodated in the case body composed of the base case and the cover case, the circuit module can be pressed and held so as not to move, and can be protected.

  In order to solve the above-mentioned problem, a lighting fixture according to a third aspect of the present invention includes a chassis; the discharge lamp lighting device according to claim 1 or 2 attached to the chassis; and a discharge lamp attached to the chassis. An electric lamp socket; and a discharge lamp supported by the socket and lit by a discharge lamp lighting device.

  In this invention, it is easy to manufacture and can provide the lighting fixture provided with the discharge lamp lighting device of Claim 1 or 2 which can improve the reliability of waterproofing.

  According to invention of Claim 1, it is easy to manufacture and can provide the discharge lamp lighting device which can improve the reliability of waterproofing.

According to the second aspect of the present invention, it is possible to provide a discharge lamp lighting device that is easy to manufacture and can improve the reliability of waterproofing, and can hold and protect the circuit module so as not to move .

  According to the invention of claim 3, it is possible to provide a lighting fixture provided with the discharge lamp lighting device according to claim 1 or 2 which is easy to manufacture and can improve the reliability of waterproofing.

  An embodiment of the present invention will be described with reference to FIGS.

  A lighting fixture 1 shown in FIG. 1 includes an elongated box-shaped chassis 2 having an open lower surface, and the lower surface of the chassis 2 is covered with a reflector 3. For example, fluorescent lamp sockets 4 are attached to both ends in the longitudinal direction of the chassis 2 as discharge lamp sockets, and these sockets 4 pass through both ends in the longitudinal direction of the reflector 3 downward. A discharge lamp lighting device (hereinafter referred to as a lighting device) 5 called a so-called electronic ballast is accommodated in the chassis 2. A discharge lamp, for example, a straight tube fluorescent lamp 6 lit by the lighting device 5 is supported by detachably connecting the both ends in the longitudinal direction to the fluorescent lamp socket 4, and is disposed below the reflector 3. Yes.

  Next, the lighting device 5 will be described with reference to FIGS. As shown in FIGS. 3 to 6 and the like, the lighting device 5 includes a case body 11 and a circuit module 31 accommodated therein. The case body 11 is attached to the chassis 2 and protects the circuit module 31. The circuit module 31 performs lighting conversion of the fluorescent lamp 6 by performing power conversion by inverter control.

  The case body 11 is formed in an elongated box shape by connecting the base case 12 and the cover case 21. The base case 12 and the cover case 21 are made of metal, for example, a light metal having excellent thermal conductivity, specifically, an aluminum alloy.

  As shown in FIG. 3 to FIG. 6 and the like, the base case 12 includes a flat base main wall 12a and a base side wall 12b that is bent from both sides in the width direction of the base main wall 12a and protrudes to one surface of the base main wall 12a. And has a U-shaped cross section. At both ends in the longitudinal direction of the base main wall 12a, attachment holes 13 are formed, and one or more, for example, two stopper projections 14 are cut and raised. The base case 12 is attached to the chassis 2 in an upside down posture from the posture shown in FIG. 3 through screws (not shown) that are passed through the attachment holes 13 from the inside and screwed into the chassis 2. The base main wall 12a is brought into close contact with the chassis 2 so that the heat of the lighting device 5 can be released to the chassis 2 in this attached state. Further, each of the base side walls 12b is provided with locking holes 15 located at both ends in the longitudinal direction and for connection with the cover case 21 and positioned between the locking holes 15 (see FIG. 2) The locking groove 16 that holds the cover case 21 in the longitudinal direction is cut out.

  The cover case 21 is shorter than the base case 12, for example, and is provided so as to cover the base case 12. The cover case 21 has cover side walls 21b that overlap the outside of the base side wall 12b on both sides in the width direction of the cover main wall 21a. Each of the cover side walls 21b is provided with locking claws 22 at both longitudinal ends thereof, and positioning protrusions 23 are provided between the locking holes 15 (see FIG. 2). Yes. Presser portions 24 are provided at both ends in the longitudinal direction of the cover main wall 21a. The presser portion 24 is formed by, for example, an edge obtained by bending both ends in the longitudinal direction of the cover main wall 21a to the back side. Instead of the bent edges, convex portions provided by deforming part of both ends in the longitudinal direction of the cover main wall 21a to the back side can be used as the pressing portions 24, or both ends in the longitudinal direction of the cover main wall 21a. It is also possible to attach a piece to the back surface and use this as the pressing portion 24.

  The cover case 21 and the base case 12 are connected by the following procedure. First, the cover case 21 is placed in alignment with the base case 12. Next, each latching claw 22 is deformed to enter the latching hole 15 which is opposed to and hooked. With this catch, the cover case 21 is connected to the base case 12 so as not to move up and down. Thereafter, each positioning protrusion 23 is bent and hooked on the edge of the locking groove 16. With this catch, the cover case 21 is connected so as not to move in the longitudinal direction of the base case 12. The state in which the case body 11 is assembled in this way is shown in FIG.

  4 to 7, the circuit module 31 includes a printed wiring board 32, a waterproof cylinder 52, a pair of end members 41, and a pair of cover tubes 55 that function as liquid-tight means.

  As shown in FIGS. 2, 5, and 6, the printed wiring board 32 has one plate surface as a component mounting surface and a wiring layer (not shown) on the other surface. The width of the printed wiring board 32 is substantially equal to the distance between the opposing surfaces of the pair of base side walls 12b. At least on the component mounting surface of the printed circuit board 32, together with a switching transistor 33, transformers 34 and 35, and various other electrical components 36, which are components for forming a lighting circuit together with the wiring layer, an input electric wire connector 37, and An output wire connector 38 and the like are mounted.

  As shown in FIG. 2, an input circuit portion 31 a to which commercial AC power is applied via an input wire connector 37 is formed by various electrical components arranged on one end side in the longitudinal direction of the circuit module 31. An output circuit portion 31b connected to the fluorescent lamp 6 via the in-apparatus wiring via the output electric wire connector 38 is formed by various electric components arranged on the other longitudinal end side of the circuit module 31. A switching transistor 33 as a power conversion circuit component for converting direct current generated by the input circuit unit 31a into a high frequency is disposed between the input circuit unit 31a and the output circuit unit 31b.

  The switching transistor 33 is attached to the printed wiring board 32 with a heat sink 39 made of aluminum alloy sandwiched between the component mounting surface. As shown in FIG. 6, the heat radiating plate 39 has a plate portion 39 a that is perpendicular to the component mounting surface, and this plate portion 39 a protrudes from one side of the printed wiring board 32. Thereby, in a state where the circuit module 31 is accommodated in the base case 12, the plate portion 39a is disposed in a heat conductive manner with the waterproof cylinder 52 sandwiched between the inner surface of the one cover side wall 21b. Accordingly, the heat of the switching transistor 33 is conducted to the case body 11 and released.

  Each of the pair of end members 41 is integrally formed of an electrically insulating material such as a synthetic resin. As representatively shown in FIG. 5 and FIG. 6, a peripheral wall 41a and an end wall 41b blocking one end of the peripheral wall 41a And has a cap shape with the other end opened. The end member 41 is sized to accommodate the end portion of the printed wiring board 32, and a substrate support portion 42 is provided therein. As illustrated in FIGS. 2 and 6, the substrate support portion 42 is made of, for example, a stepped portion on the inner side surface of the peripheral wall 41 a.

  The end member 41 has at least one waterproof member 45. That is, one waterproof member 45 is provided on one end member 41 arranged on the input side, and three waterproof members 45 are provided on the other end member 41 arranged on the output side.

  The waterproof member 45 is made of a soft and elastic material such as rubber or elastomer. As shown in FIGS. 4 and 5, the waterproof member 45 includes a cylindrical portion 45 a and an end plate portion 45 b with one end opening of the cylindrical portion 45 a closed. Have. The end plate portion 45b is formed with a recess 45c recessed from the surface thereof. The waterproof member 45 is formed by press-fitting the tubular portion 45a into a recess inside a back-side convex portion 46 (see FIGS. 5 and 6) integrally formed on the back surface of the end wall 41b of the end member 41. It is attached to.

  A small hole 46 a communicating with the inside of the cylindrical portion 45 a is formed in the back wall of the back-side convex portion 46. As represented in FIG. 5, the input wire connector 37 or the output wire connector 38 is disposed in contact with the back surface of the back wall of the back-side convex portion 46 with its wire inlet (not shown) in contact therewith. As the input wire connector 37 and the output wire connector 38, plug-in type connectors having a locking portion (not shown) are used. Accordingly, the insulated wire 45 (represented by the in-device wiring in FIG. 5) such as the in-device wiring and the power supply line is pushed into the waterproof member 45, and the electric conductor 47a of the electric wire 47 passes through the small hole 46a. When inserted into the input wire connector 37 or the output wire connector 38, the electrical conductor 47a is electrically and mechanically connected. Further, in such an electric wire connection, since the electric wire 47 penetrates the recess 45c of the end plate portion 45b and passes through the cylindrical portion 45a, the inner surfaces of the end plate portion 45b and the cylindrical portion 45a are elastically in close contact with the outer periphery of the electric wire 47. . Thereby, the liquid tightness of an electric wire insertion part is securable without requiring the effort which apply | coats the adhesive agent for waterproofing to the electric wire insertion part with respect to the input electric wire connector 37 or the output electric wire connector 38. FIG.

  The pair of end members 41 support both ends of the printed wiring board 32 by inserting the end portions of the printed wiring board 32 therein. In this support, the end portion of the printed wiring board 32 accommodated in the end member 41 is inserted and supported so as to be sandwiched between the substrate support portion 42 and the back-side convex portion 46 as shown in FIG. As a result, the movement of the printed wiring board 32 in the vertical direction is restricted while the lighting device 5 is attached to the chassis 2.

  The waterproof cylinder 52 has a cylindrical shape with both ends opened, and its peripheral wall has a liquid-tight structure. In this embodiment, as shown in FIG. 2 and FIG. The waterproof cylinder 52 has a length over the pair of end members 41. The waterproof cylinder 52 is preferably made of a material such as Lumirror (trade name) that is electrically insulating and thin in a film shape to obtain thermal conductivity, and that can be elastically deformed.

  The waterproof cylinder 52 is provided to accommodate the printed wiring board 32 while fitting both ends in the longitudinal direction thereof to the outer periphery of the end member 41. Since the waterproof cylinder 52 is thin and can be elastically deformed, the operation of accommodating the printed wiring board 32 therein and the operation of fitting it into the end member 41 can be facilitated. Both ends of the waterproof cylinder 52 are liquid-tightly fitted to the end member 41 using the cover tube 55.

  That is, a heat-shrinkable tube is used for the cover tube 55. As shown in FIGS. 4, 5, and 7, the cover tube 55 is fitted over the end of the waterproof cylinder 52 and the outer periphery of the end member 41, and is contracted by heat applied from the outside in this state. Yes. By this contraction, the end of the waterproof cylinder 52 is brought into close contact with the outer peripheral surface of the end member 41, and liquid tightness around the end member 41 is ensured. The structure for waterproofing between the end member 41 and the waterproof cylinder 52 using the heat-shrinkable cover tube 55 as described above is excellent in that it can be easily performed because no adhesion is required. At the same time as the waterproofing around the end member 41 is formed by the procedure described above, the circuit module 31 is assembled.

  The assembled circuit module 31 is assembled into the base case 12 as shown in FIG. This assembly is performed while the base side wall 12b is pushed slightly outward, so that the plate portion 39a of the heat radiating plate 39 is brought into close contact with the one base side wall 12b through the waterproof cylinder 52. Further, since the stopper projections 14 can be engaged with both ends of the circuit module 31 incorporated in the base case 12, that is, the end walls 41b of the pair of end members 41, the base case 12 and thus the case body. 11 along the longitudinal direction of the circuit module 31 is prevented.

  Thereafter, the cover case 21 is covered with the base case 12 so as to cover the circuit module 31. In this state, the case 11 is assembled by bending the locking claws 22 and the positioning protrusions 23. Thus, the assembly of the lighting device 5 is completed without using a fixing part such as a screw. Accompanying this assembly, the holding portions 24 at both ends of the cover case 21 press the pair of end members 41 toward the cover main wall 21a of the base case 12 (see FIG. 5). Thus, the end member 41 is sandwiched between the base case 12 and the cover case 21 so as not to move in the vertical direction.

  In the lighting device 5 having the above-described configuration, the waterproof cylinder 52 straddling the pair of end members 41 that support the printed wiring board 32 at both ends thereof is waterproof except for the openings at both ends. Contained. Then, both end portions of the waterproof cylinder 52 are fitted onto the outer periphery of the end member 41 in a liquid-tight manner. Furthermore, the insertion part of the electric wire 47 with respect to the end member 41 is waterproofed by a waterproof member 45 through which the electric wire 47 passes. Since the printed wiring board 32 can be disposed in the sealed space by securing the connection portion between the end member 41 and the waterproof cylinder 52 and the waterproofness of the wire insertion portion with respect to the end member 41 in this way, the printed wiring board 32 is securely attached. Can be waterproof.

  In this case, simultaneously with the insertion of the electric wire 47 into the waterproof member 45, waterproofing is achieved at this insertion portion. Therefore, as a waterproof measure, both ends of the waterproof cylinder 52 are only liquid-tightly fitted to the outer periphery of the end member 41. It's okay. For this reason, compared with the structure which utilizes the case body 11 for waterproofing, the location which requires a waterproof measure can be reduced. Therefore, the number of places where there is a possibility of causing a waterproof failure is reduced, so that the probability that the waterproof performance is impaired is lowered, and the luminaire 1 including the lighting device 5 that can be used outdoors or in a high-humidity environment can be provided.

  And since the lighting device 5 can be assembled without requiring fixed parts such as screws, coupled with the fact that there are few places where waterproofing measures are required as described above, the productivity can be improved and the assembly can be mechanized. Is also suitable. Thereby, the cost of the lighting device 5 can be reduced.

  Furthermore, since the waterproof cylinder 52 has not only a waterproof function but also electrical insulation, electrical insulation between various electrical components mounted on the printed wiring board 32 and the metal case body 11 is achieved. Can also serve. Thereby, compared with the case where an insulating member is used exceptionally, a number of parts can be reduced and cost reduction is possible.

Further, since the heat is connected to the base side wall 12b of the base case 12 through the thin waterproof cylinder 52, the heat of the switching transistor 33 which is extinguished with lighting is released to the case body 11 and further to the chassis 2. Conducted and released.

  In order to reduce the length of the discharge lamp lighting device and make it compact, for example, the printed wiring board 32 accommodated in the waterproof cylinder 52 includes a printed wiring board shown in FIG. 8A or 8B. 32 can be used.

  In the example of FIG. 8A, the printed wiring board 32 is formed of a first board element 32a, a second board element 32b, and a flexible wiring board 32c. The first board element 32a forms, for example, an input circuit portion 31a with an electrical component 36a or the like mounted thereon, and the second board element 32b forms an output circuit portion 31b with an electrical component 36b or the like mounted thereon. ing. One end of the first board element 32a and one end of the second board element 32b corresponding to the one end are electrically connected by the wiring board 32c. The first board element 32a and the second board element 32b are arranged in a stacked state so that their component mounting surfaces face each other, and are combined by providing an insulating sheet 30 such as insulating paper between them. Yes. The insulating sheet 30 is held by a holding means (not shown) so as not to deviate from an appropriate position between the first substrate element 32a and the second substrate element 32b. By adopting such a two-divided printed wiring board 32, the length thereof can be shortened, so that the discharge lamp lighting device provided with the printed wiring board 32 can be miniaturized.

  Also in the example of FIG. 8B, the printed wiring board 32 is formed of a first board element 32a, a second board element 32b, and a flexible wiring board 32c. The first board element 32a forms, for example, an input circuit portion 31a with an electrical component 36a or the like mounted thereon, and the second board element 32b forms an output circuit portion 31b with an electrical component 36b or the like mounted thereon. ing. The flexible wiring board 32c having electrical insulation electrically connects one end of the first board element 32a and the other end of the second board element 32b located on the opposite side of the one end. is doing. An intermediate portion of the wiring board 32c is disposed between the first board element 32a and the second board element 32b. The first board element 32a and the second board element 32b are arranged so that their component mounting surfaces face each other, and are electrically insulated by a wiring board 32c. By adopting such a two-divided printed wiring board 32, the length thereof can be shortened, so that the discharge lamp lighting device provided with the printed wiring board 32 can be miniaturized. In addition, since the first substrate element 32a and the second substrate element 32b combined in the laminated state are insulated using the flexible wiring board 32c, no special insulating sheet is required. The cost can be reduced by reducing the number of parts, and the printed wiring board 32 can be made smaller in view of the shape because an insulating sheet holding means is not required.

  8A and 8B, reference numeral 12C denotes a base case, and 21C denotes a cover case, which are combined with each other to form a case body. The case body is divided into two parts. A printed wiring board 32 is accommodated. In this case, in the configuration of the non-waterproof lighting device, it may be carried out without using a waterproof cylinder.

  The present invention is not limited to the one embodiment. It is also possible to omit the case body that protects the circuit module so as to be a discharge lamp lighting device. In this case, the end members at both ends are attached to the chassis by clamps or the like, or protrude to the outside of the end members. It can be implemented by providing a screwing portion and attaching the screw to the chassis through a screw.

The side view which shows the lighting fixture which concerns on one Embodiment of this invention in a partial cross section. The perspective view which decomposes | disassembles and shows the discharge lamp lighting device which concerns on one Embodiment of this invention with which the lighting fixture of FIG. 1 is equipped. The perspective view which shows the one end part of the discharge lamp lighting device of FIG. The perspective view which decomposes | disassembles and shows the one end part of FIG. Sectional drawing shown along the F5-F5 line | wire in FIG. Sectional drawing which shows the periphery of the switching transistor which the discharge lamp lighting device of FIG. 2 had. The top view which shows the one end part of the circuit module with which the discharge lamp lighting device of FIG. 2 is provided. (A) is a perspective view which shows the other example of the printed wiring board which can be integrated in the discharge lamp lighting device of FIG. (B) is a perspective view which shows the further another example of the printed wiring board which can be integrated in the discharge lamp lighting device of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Chassis, 3 ... Fluorescent lamp socket (discharge lamp socket), 6 ... Fluorescent lamp (discharge lamp), 11 ... Case body, 12 ... Base case, 21 ... Cover case, 24 ... Holding part, 31 ... Circuit module, 32 ... Printed circuit board, 33 ... Switching transistor (electric part), 34 ... Transformer (electric part), 35 ... Transformer (electric part), 36 ... Electrical part, 37 ... Electric wire connector for input, 38 ... Output Electric wire connector, 41 ... end member, 45 ... waterproof member, 47 ... electric wire, 52 ... waterproof cylinder, 55 ... cover tube (liquid-tight means)

Claims (3)

A printed wiring board in which plug-in type wire connectors are mounted at both ends, and various electrical components forming a discharge lamp lighting circuit are mounted between the connectors;
A pair of end members provided with a waterproof member made of a soft material into which an electric wire inserted into the electric wire connector is inserted in a liquid-tight manner and accommodating an end of the printed wiring board;
A waterproof cylinder in which the peripheral wall has a liquid-tight structure and has both ends opened to accommodate a printed wiring board, and the both opened ends are liquid-tightly fitted to a pair of end members ;
A discharge lamp lighting device comprising: A printed wiring board in which plug-in type wire connectors are mounted at both ends, and various electrical components forming a discharge lamp lighting circuit are mounted between the connectors;
A pair of end members provided with a waterproof member made of a soft material into which an electric wire inserted into the electric wire connector is inserted in a liquid-tight manner and accommodating an end of the printed wiring board;
A waterproof cylinder in which the peripheral wall has a liquid-tight structure and has both ends opened to accommodate a printed wiring board, and the both opened ends are liquid-tightly fitted to a pair of end members;
A base case for accommodating a printed circuit board, a pair of end members, and a circuit module assembled by a waterproof cylinder;
A cover case that covers the circuit module and is combined with the base case to form a case body, and has a pressing portion for sandwiching a pair of end members between the base case;
A discharge lamp lighting device comprising: With chassis;
The discharge lamp lighting device according to claim 1 or 2 attached to the chassis;
A discharge lamp socket attached to the chassis;
A discharge lamp supported by this socket and lit by a discharge lamp lighting device;
The lighting fixture characterized by comprising.

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