JP2008108644A - Discharge lamp lighting device and lighting fixture using it as well as illumination device for refrigeration showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of easily mounting a case lid on a case main body, and surely coupling the case main body and the case lid, as well as a lighting fixture using it and an illumination device for a refrigeration showcase. <P>SOLUTION: In a structure of a case main body 2 made of metal loading a printed wiring board 1 and a case lid 3 made of metal to be mounted on the case main body 2 so as to cover the printed wiring board 1, nearly rectangular protruded pieces 33 protruded outward are set in protrusion at an upper end each of both side edges along a short-side direction of a short-side piece 32 of the case lid 3, and nearly triangular ribs 26 opposed to lower-end edges of the short-side piece 32 are continuously integrated with a leg piece 21 at both ends in a length direction of the leg piece 21 of the case main body 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device, a lighting fixture using the same, and a lighting device for a refrigerated showcase.

  Conventionally, a discharge lamp lighting device has been provided for lighting a lamp such as a fluorescent lamp. Among these, in a discharge lamp lighting device generally called an inverter system, an AC voltage from an AC power source such as a commercial power source is supplied. An inverter circuit is mounted which includes a DC converter that converts DC voltage, and a high-frequency converter that converts the DC voltage output of the DC converter into high-frequency power and supplies it to the lamp. The inverter circuit is configured by mounting a large number of electronic components on a printed wiring board. However, when dust or water droplets adhere to the printed wiring board, problems such as short circuit or poor conduction occur, and a discharge lamp lighting device. Therefore, the printed wiring board is housed in a metal or resin case to protect it from dust and water droplets. Generally, a case for storing a printed wiring board includes a case main body on which the printed wiring board is placed and a case lid attached to the case main body so as to cover the printed wiring board (see, for example, Patent Document 1). ).

  Hereinafter, a conventional example of a discharge lamp lighting device having the above case will be described with reference to the drawings. In the following description of the conventional example, the vertical and horizontal directions in FIG. 7A are defined as the vertical and horizontal directions, the front side of the paper is defined as the front direction, and the back side of the paper is defined as the rear direction. As shown in FIG. 7, this conventional example includes a substantially rectangular printed wiring board 1 on which components (not shown) of an inverter circuit for supplying high frequency power to a discharge lamp (not shown) are mounted, It comprises a metal case main body 2 on which the wiring board 1 is placed and a metal case lid 3 attached to the case main body 2 so as to cover the printed wiring board 1.

  Note that the case lid 3 does not cover the entire printed wiring board 1, and as shown in FIG. 8B, at the front end of the printed wiring board 1, the connection between the commercial power supply and the inverter circuit and other discharge lamps A pair of power supply terminals 10 for connection to the lighting device are connected to a signal line for receiving a dimming signal for dimming the discharge lamp and transmitting a dimming signal to another discharge lamp lighting device. In order to supply high frequency power from the inverter circuit to the discharge lamp via a socket (not shown) at the rear end of the printed wiring board 1. The discharge lamp terminal 12 to which the feeder line is connected is exposed to the outside. Further, as shown in FIG. 7A, a grounding screw 13 is provided at the front end of the printed wiring board 1, and the grounding screw 13 penetrates the printed wiring board 1 and is connected to the case body 2. Thus, a predetermined portion of the inverter circuit is electrically connected to the metal case body 2 and grounded.

  As shown in FIG. 7A, the case body 2 is formed in a substantially U-shaped cross section, and has a substantially rectangular main plate 20 facing the printed wiring board 1 in the vertical direction, and both sides along the longitudinal direction of the main plate 20. It consists of a pair of leg pieces 21 extending along both side edges along the longitudinal direction of the printed wiring board 1 from the edges. At the front end portion and the rear end portion of the leg piece 21, a substantially arc-shaped restriction portion 22 that restricts the movement of the printed wiring board 1 in the front-rear direction, and a substantially semicircular support section on which the printed wiring board 1 is placed. 23 and a substantially rectangular holding part 24 for restricting the movement of the printed wiring board 1 in the vertical direction are respectively provided. The printed wiring board 1 is placed on the support part 23 and the front restricting part 22 and the rear restricting part 22 are arranged. By being sandwiched between the side restricting portions 22, the movement of the printed wiring board 1 in the front-rear direction is restricted. Further, the holding portion 24 is bent and sandwiched between the holding portion 24 and the support portion 23, so that the vertical movement of the printed wiring board 1 is also restricted and the printed wiring board 1 is fixed to the case body 2. It has become.

  As shown in FIG. 7A, the case lid 3 has a substantially rectangular top plate 30 facing the printed wiring board 1 in the vertical direction, and leg pieces 21 from both side edges along the longitudinal direction of the top plate 30. A pair of long side pieces 31 extending perpendicularly toward the main plate 30 so as to cover, and perpendicular to the long side piece 31 from both side edges along the short direction of the top plate 30 and perpendicular to the main plate 30 It consists of a pair of short side pieces 32 extended. Both side edges along the short side direction of the long side piece 31 and both side edges along the short side direction of the short side piece 32 are not integrally connected to each other but are separated by a predetermined length, and the case lid 3 is separated from the case main body. The case lid 3 is attached to the case main body 2 by inserting the leg pieces 21 of the case main body 2 between the long side piece 31 and the short side piece 32.

  As shown in FIG. 8A, substantially rectangular openings 34 are respectively provided at both ends in the longitudinal direction of the short side piece, and lower ends along the longitudinal direction of the inner periphery of each opening 34. From the edge, a substantially rectangular hooking piece 35 formed integrally with the short side piece 32 protrudes. In addition, a substantially rectangular hooking hole 25 that overlaps the opening 34 in a state where the case body 2 and the case lid 3 are attached is penetrated at both ends of the leg piece 21 in the longitudinal direction. The case main body 2 and the case lid 3 are coupled by bending the piece 35 inward and hooking it in the latching hole 25 of the leg piece 21.

Here, on both side edges along the short side direction of the short side piece 32, as shown in FIG. 7B, substantially triangular protrusions 32a protruding outward are provided, and the protrusions 32a are provided. The leg piece 21 is prevented from falling inward by contacting the leg piece 21, and the leg piece 21 is sandwiched and fixed by the long side piece 31 and the protrusion 32a. In this way, by restricting the leg piece 21 from falling inward, the latching piece 35 is prevented from being detached from the latching hole 25 and the coupling between the case body 2 and the case lid 3 is released.
JP 2002-175718 A

  By the way, in the above conventional example, the leg piece 21 of the case main body 2 is fixed so as to be sandwiched between the long side piece 31 of the case cover 3 and the protrusion 32a, so that when the case cover 3 is attached to the case main body 2 In this case, the long side piece 31 and the short side piece 32 of the case lid 3 must be lowered vertically from above the case body 2 toward a predetermined position. Here, if the long side piece 31 and the short side piece 32 are forcibly lowered without being lowered vertically, the case lid 3 cannot be attached to the case body 2 and further, the protrusion 32a may be damaged. was there. Therefore, in order to easily attach the case lid 3 to the case body 2 in the conventional example, it is necessary to increase the distance between the protrusion 32a and the long side piece 31.

  However, if the distance between the protrusion 32a and the long side piece 31 is made longer than necessary, the effect of restricting the leg piece 21 from falling down by the protrusion 32a is diminished, and the leg piece 21 falls inward. As a result, there is a possibility that the latching piece 35 is detached from the latching hole 25 and the coupling between the case body 2 and the case lid 3 is released. Further, when the distance between the protrusion 32a and the long side piece 31 is increased, the leg piece 21 is freely moved in the front-rear direction because the leg piece 21 cannot be firmly sandwiched between the protrusion 32a and the long side piece 31. Therefore, for example, it may be difficult to accurately overlap the opening 34 of the long side piece 31 and the latching hole 25 of the leg piece 21 at the time of manufacture. For this reason, it is necessary to design the distance between the protrusion 32a and the long side piece 31 to be a required length, and the dimensional error must be extremely small, which makes manufacturing difficult. was there.

  The present invention has been made in view of the above points, and a discharge lamp lighting device capable of easily attaching a case lid to the case main body and securely coupling the case main body and the case lid, and a device using the same. It is an object of the present invention to provide an illuminating device and a lighting device for a refrigerated showcase.

  In order to achieve the above object, a first aspect of the present invention provides a substantially rectangular printed wiring board on which components of an inverter circuit for supplying high-frequency power to a discharge lamp are mounted, and a printed wiring in the thickness direction of the printed wiring board. A metal case main body comprising a substantially rectangular main plate facing the plate and a pair of leg pieces extending from both side edges along the longitudinal direction of the main board along both side edges along the longitudinal direction of the printed wiring board; A substantially rectangular top plate facing the printed wiring board in the thickness direction of the printed wiring board and a pair extending vertically toward the main board so as to cover the leg pieces from both side edges along the longitudinal direction of the top board And a pair of short side pieces that are perpendicular to the long side piece and extend perpendicularly to the main plate from both side edges along the short side direction of the top plate so as to cover the printed wiring board Attached to the case body A discharge lamp lighting device comprising a metal case lid, wherein the short side pieces project from both side edges along the short side direction and both side edges along the short side direction of the leg pieces; Opposite protruding pieces are provided, the long side pieces have openings at both ends in the longitudinal direction, and hook pieces protruding from the inner periphery of the opening are provided, and the leg pieces are arranged in the longitudinal direction. A latching hole through which the latching piece is bent and latched is provided at both ends, and a regulation means for regulating the leg piece from falling inward is provided on the case body or the case lid. And

  According to a second aspect of the present invention, in the first aspect of the present invention, the restricting means is provided on both side edges along the short direction of the leg piece and abuts on both side edges along the short direction of the short side piece. It consists of ribs.

  According to a third aspect of the present invention, in the second aspect of the present invention, the case main body and the case lid have a distance between the rib and the short side piece that is at least shorter than the length of the front end of the latching piece. It was formed as follows.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the short side piece is provided with a recess into which a rod-shaped tool is inserted at both side edges along the short direction. Features.

  The invention of claim 5 is the invention of any one of claims 1 to 4, wherein the latching piece is one side edge along the longitudinal direction of the inner periphery of the opening or one side along the short side direction. It protrudes from one of the edges.

  The invention according to claim 6 is an appliance main body, a socket attached to the appliance main body to which the discharge lamp is detachably mounted, and electric power is supplied to the discharge lamp via the socket. And a discharge lamp lighting device as described above.

  The invention according to claim 7 is a socket which is disposed in a refrigerator for refrigeration and display of merchandise and in which the discharge lamp is detachably mounted, and power is supplied to the discharge lamp through the socket. The discharge lamp lighting device according to claim 1 is provided.

  According to the first aspect of the present invention, the case main body is provided with the projecting pieces projecting from both side edges along the short side direction of the short side piece and facing both side edges along the short side direction of the leg piece. When attaching the case lid, it is possible to prevent the longitudinal displacement of the case body, and the case lid can be easily attached to the case body. Further, since the case body or the case lid is provided with a restricting means for restricting the leg pieces from falling inward, the leg pieces can be prevented from falling out of the hooking holes due to the leg pieces falling inward. The case body and the case lid can be securely coupled.

  According to the invention of claim 2, since the ribs that contact the both side edges along the short direction of the short side piece are provided on both side edges along the short side direction of the leg piece, the leg piece falls down inside. Since the rib regulates the inclination by contacting both side edges along the short side direction of the short side piece, the leg piece can be prevented from falling out of the latch hole due to the leg piece falling inward. Therefore, the case main body and the case lid can be securely coupled.

  According to the invention of claim 3, since the case main body and the case lid are formed so that the distance between the rib and the short side piece is at least shorter than the length of the tip of the bent hook piece, Even if the piece falls inward, the latching piece does not come off from the latching hole, so that the case main body and the case lid can be more reliably coupled.

  According to invention of Claim 4, since the recessed part in which a rod-shaped tool is inserted was provided in the both-sides edge along the transversal direction of a short side piece, the hook which inserted and bent the rod-shaped tool from the recessed part was respectively provided. The latching by the latching piece can be released by pushing the stopper in the direction opposite to the bending direction.

  According to the invention of claim 6, it is possible to realize a lighting fixture that exhibits the effect of any one of claims 1 to 5.

  According to the invention of claim 7, the refrigerated showcase illumination device having the effect of any one of claims 1 to 5 can be realized.

  First, an embodiment of a discharge lamp lighting device according to the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted. In the following description of the embodiment of the discharge lamp lighting device, the top, bottom, left, and right in FIG. 1A are defined as the top, bottom, left, and right directions, the front side of the page is the front direction, and the back side of the page is the rear direction. In the present embodiment, as shown in FIG. 1, a substantially rectangular printed wiring board 1 on which components (not shown) of an inverter circuit for supplying high-frequency power to a discharge lamp (not shown) are mounted; It consists of a metal case main body 2 on which the wiring board 1 is placed and a metal case lid 3 attached to the case main body 2 so as to cover the printed wiring board 1. The structure of the lid 3 is characteristic.

  The short side piece 32 of the case lid 3 is provided with a substantially rectangular protruding piece 33 protruding outward at the upper end of both side edges along the short side direction, as shown in FIG. Yes. In addition, as shown in FIG. 1B, the case lid 3 has a distance L2 between the front short side piece 32 and the rear short side piece 32 that is longer than the length L1 of the leg piece 21 in the longitudinal direction. It is formed to be slightly longer. For this reason, when the case main body 2 and the case lid 3 are coupled, the leg piece 21 can be sandwiched between the front protruding piece 33 and the rear protruding piece 33. Accordingly, since the movement of the leg piece 21 in the longitudinal direction can be restricted, the opening 34 and the retaining hole 25 can be easily overlapped, and the case lid 3 can be easily attached to the case body 2. Can do.

  Further, the lower end portions of both side edges along the short direction of the short side piece 32 are formed so as to be rounded. For this reason, either the left or right long side piece 31 is hooked on the leg piece 21, and then the other long side piece is rotated by using the contact portion between the hooked long side piece 31 and the leg piece 21 as a fulcrum. When attaching the case lid 3 to hook the 31 on the leg piece 21, the lower ends of both side edges along the short direction of the short side piece 32 do not hinder the rotation. It can be easily attached (see FIG. 3).

  As shown in FIG. 1B, a substantially rectangular cutout 34 and a latching piece 35 are provided at both ends of the long side piece 31 in the front-rear direction. The latching piece 35 is a cut-and-raised piece in which one end is continuously connected integrally to the side edge along the short direction of the inner periphery of the notch 34 and the portion excluding the one end is separated from the inner periphery of the notch 34. It is constituted by. Therefore, as in the conventional example, the notch 34 and the latching hole 25 are overlapped with the case lid 3 attached to the case main body 2 (see FIG. 4A), and the latching piece 35 is bent. The case main body 2 and the case lid 3 are coupled by being latched in the latch hole 25 (see FIG. 4B). The notches 34 and the latching pieces 35 are not necessarily limited to the configuration of the present embodiment, and may have the same configuration as the opening 34 and the latching pieces 35 of the conventional example, for example.

  As shown in FIG. 1A, the case lid 3 has a shorter length at the lower end edge of the short side piece 32 so that the distance between the left leg piece 21 and the right leg piece 21 is shorter. As shown in FIG. 1B, substantially triangular ribs 26 facing the lower edge of the short side piece 32 are continuous with the leg piece 21 at both ends in the longitudinal direction of the leg piece 21. Each is formed integrally. For this reason, since the short side piece 32 is interposed between the left and right ribs 26, even if the leg piece 21 falls inward, the rib 26 comes into contact with the lower end edge of the short side piece 32 and the inclination is restricted.

  As shown in FIG. 2B, in the state where the case main body 2 and the case lid 3 are coupled, the distance L4 between the leg piece 21 (rib 26) and the short side piece 32 is a latch. It is desirable that the length is set to be shorter than the length L3 of the tip portion protruding inward from the retaining hole 25 of the piece 35. By setting in this manner, the case main body 2 and the case lid 3 can be more reliably coupled to each other because the retaining piece 35 does not come off from the retaining hole 25 even if the leg piece 21 falls inward. .

  In addition, concave portions 36 that are recessed inward are provided on both side edges along the short direction of the short side piece 32. The recess 36 is formed in a size that allows insertion of a rod-shaped tool (not shown) such as a screwdriver, for example, and the rod-shaped tool is inserted from the recess 36 in a state where the case body 2 and the case lid 3 are coupled. By inserting and bending the latching piece 35 in the direction opposite to the folding direction, the latching piece 35 can be removed from the latching hole 25 and the coupling between the case body 2 and the case lid 3 can be released. It is like that.

  As described above, since the substantially rectangular projecting pieces 33 projecting outward are provided at the upper ends of both side edges along the short side direction of the short side piece 32, when attaching the case lid 3 to the case main body 2. In addition, the case main body 2 can be prevented from being displaced in the longitudinal direction by being sandwiched between the leg pieces 21 by the front and rear protruding pieces 33, and the case lid 3 can be easily attached to the case main body 2. In addition, since the substantially triangular ribs 26 facing the lower end edge of the short side piece 32 are formed at both ends in the longitudinal direction of the leg piece 21 so as to be continuous and integrated with the leg piece 21, respectively, the leg piece 21 falls inward. And the latching piece 35 can be prevented from coming off from the latching hole 25, so that the case body 2 and the case lid 3 can be securely coupled.

  Next, an embodiment of a lighting fixture according to the present invention will be described with reference to the drawings. In the following description of the embodiment of the lighting fixture, the vertical direction in FIG. 5 is defined as the vertical direction. In the present embodiment, as shown in FIG. 5, two flat instrument bodies 4 are suspended by suspension bolts 41 provided on the ceiling, and two are provided at both ends in the longitudinal direction of the instrument body 4. The discharge lamp LP includes a socket 40 to which the discharge lamp LP is detachably attached, and an inverted Fuji-type reflector 42 that is attached to the instrument body 4 and reflects light from the discharge lamp LP. The lighting device A is attached to the instrument body 4.

  A bolt mounting hole 4a is provided below the instrument body 4 with a certain interval, and a suspension bolt 41 is inserted into the bolt mounting hole 4a from above and tightened with a washer 41a and a nut 41b from below. The instrument body 4 is suspended. In addition, attachment brackets 43 for attaching the reflecting plate 42 are provided at both ends and substantially the center in the longitudinal direction of the instrument body 4, and screws provided respectively at both ends and substantially the center of the reflecting plate 42 in the longitudinal direction. The reflection plate 42 is attached to the instrument body 4 by inserting the attachment screw 44 from below into the insertion hole 42 a and screwing it into the attachment hole 43 a provided in the attachment fitting 43.

  Two socket insertion holes 42b for inserting the sockets 40 are provided at both ends in the longitudinal direction of the reflection plate 42, respectively. In order to attach the discharge lamp LP to the socket 40, first, when attaching the reflecting plate 42 to the instrument body 4, the socket 40 is faced downward through the socket insertion hole 42b, and thereafter, approximately at the center in the longitudinal direction of the reflecting plate 42. The discharge lamp LP is fitted into the two substantially annular caps 45 provided, and both ends in the longitudinal direction of the discharge lamp LP are attached to the socket 40.

  A substantially box-shaped terminal block 46 that is electrically connected to the discharge lamp lighting device A is provided in the approximate center below the appliance body 4, and a power line 47 that is routed from the outside is connected to the terminal block 46. The discharge lamp LP is connected to the terminal block 46 through a power line insertion hole 4b provided in the vicinity, and electrically connected to the discharge lamp lighting device A, the terminal block 46, and the socket 40 by electric wires (not shown). Is supplied with power.

  As mentioned above, the lighting fixture using the above-mentioned discharge lamp lighting device A can be provided.

  Finally, an embodiment of a lighting device for a refrigerated showcase according to the present invention will be described with reference to the drawings. In the following description of the embodiment of the lighting device for a refrigerated showcase, the vertical direction in FIG. 6B is defined as the vertical direction, and the horizontal direction in FIG.

  As shown in FIG. 6 (b), the refrigerated showcase of the present embodiment includes a showcase body 5 that is formed in a substantially box shape with a heat insulating material and has an open front surface, and a storage portion 50 in which products are stored and displayed. , And a duct 51 through which cool air for cooling the storage section 50 circulates. The storage section 50 and the duct 51 are separated from each other by a duct plate 52. The storage unit 50 is provided with a plurality (four in the figure) of display shelves 56, and a discharge lamp LP is attached to the lower surface of the front end of each display shelf 56. These discharge lamps LP are lit by the discharge lamp lighting device A of the above-described embodiment attached to the upper end portion and the lower end portion of the showcase body 5 respectively.

  The duct 51 is provided in a substantially U-shaped cross section so as to cover the storage unit 50, and a cooler 53 is disposed inside. A suction port 51a for sucking air is provided at the lower part of the front end of the duct 51, and the air flowing from the suction port 51a is sent to the cooler 53 by a blower fan (not shown) and cooled by the cooler 53. The air is blown out from an air outlet 51b provided at the upper front end of the duct 51. Since the air blown out from the air outlet 51b is again taken into the duct 51 from the air inlet 51a, an air curtain is formed in the opening of the showcase body 5 by the cooled air to cool the storage portion 50. Further, as shown in FIG. 6A, the operation unit 54 of a control device (not shown) for controlling illumination by the discharge lamp LP and the temperature of the storage unit 50 are provided at the upper end of the showcase body 5. And a temperature indicator 55 for displaying.

  As described above, a refrigerated showcase illumination device using the above-described discharge lamp lighting device A can be provided.

It is a figure which shows embodiment of the discharge lamp lighting device which concerns on this invention, (a) is a front view, (b) is a side view. It is a figure which shows the principal part same as the above, (a) is a figure which shows the coupling | bonding of a case main body and a case cover, (b) is a partially expanded view. It is a figure which shows an example of the coupling | bonding method of a case main body and a case cover same as the above. It is a figure which shows a latching piece same as the above, (a) is a figure which shows the state before making it bend, (b) is a figure which shows the state after making it bend. It is a disassembled perspective view which shows embodiment of the lighting fixture which concerns on this invention. It is a figure which shows embodiment of the illuminating device for refrigerated showcases which concerns on this invention, (a) is a front view, (b) is a side view. It is a figure which shows the conventional discharge lamp lighting device, (a) is a front view, (b) is a partially expanded view. In the same schematic diagram, (a) is a side view and (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printed wiring board 2 Case main body 20 Main board 21 Leg piece 25 Latch hole 26 Rib 3 Case cover 30 Top plate 31 Long side piece 32 Short side piece 33 Projection piece 34 Notch
35 Hanging piece

Claims (7)

  A substantially rectangular printed wiring board on which components of an inverter circuit for supplying high-frequency power to a discharge lamp are mounted, a substantially rectangular main board facing the printed wiring board in the thickness direction of the printed wiring board, and a longitudinal direction of the main board A metal case body composed of a pair of leg pieces extending along both side edges along the longitudinal direction of the printed wiring board from both side edges along the line, and an approximately facing the printed wiring board in the thickness direction of the printed wiring board A rectangular top plate and a pair of long side pieces extending vertically toward the main plate so as to cover the leg pieces from both side edges along the longitudinal direction of the top plate and both sides along the short side direction of the top plate A metal case lid comprising a pair of short side pieces perpendicular to the long side piece from the edge and extending vertically toward the main plate and attached to the case body so as to cover the printed wiring board. Electric lighting device The short side piece is provided with a protruding piece that protrudes from both side edges along the short side direction and faces both side edges along the short side direction of the leg piece, and the long side piece is long A latching piece having an opening at each end in the direction and protruding from the inner periphery of the opening is provided, and the leg piece is latched by bending the latching piece at both ends in the longitudinal direction. A discharge lamp lighting device, characterized in that a retaining hole is provided in each case, and a restricting means for restricting the leg piece from falling inward is provided on the case body or the case lid.   The said restriction | limiting means consists of the rib which is provided in the both-sides edge along the transversal direction of the said leg piece, respectively, and contact | abuts with the both-sides edge along the transversal direction of a short side piece, Discharge lamp lighting device.   The case main body and the case lid are formed such that a distance between the rib and the short side piece is at least shorter than a length of a front end portion of the hooking piece that is bent. 2. The discharge lamp lighting device according to 2.   The discharge lamp lighting device according to any one of claims 1 to 3, wherein each of the short side pieces is provided with a concave portion into which a rod-shaped tool is inserted at both side edges along the short direction. .   The said latching piece protrudes from either one side edge along the longitudinal direction of the said inner periphery of the said opening part, or one side edge along a transversal direction, The one of the Claims 1 thru | or 4 characterized by the above-mentioned. The discharge lamp lighting device according to item 1.   The discharge lamp lighting device according to any one of claims 1 to 5, wherein a power source is supplied to the discharge lamp through the socket, the socket main body, a socket attached to the main body of the instrument and detachably mounted with the discharge lamp. A lighting fixture characterized by comprising:   The socket according to any one of claims 1 to 5, wherein the discharge lamp is detachably mounted in a refrigerator for storing and displaying products, and power is supplied to the discharge lamp through the socket. An illuminating device for a refrigerated showcase, comprising an electric lamp lighting device.

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