JP2010103070A - Discharge tube with connector, connector for the discharge tube, and surface light source device having discharge tube with connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that it is difficult to mount the discharge tube with a base in a holder since the facing ends forming an abutment joint are brought into contact with an opening (an inserting hole) of the holder when a discharge tube with a connector with a cylindrical portion having a gap between an outer peripheral surface of a glass tube and having the abutment joint in the lengthwise direction and installed on an end of the discharge tube by being deformed so as to widen the gap between the facing ends forming the abutment is mounted in the holder electrically connected to a power supply circuit. <P>SOLUTION: The discharge tube (50) with the connector includes the glass tube (7), the cylindrical portion (2) mounted on an end of the glass tube (7), and a connector (1) having the facing ends (8) arranged on the cylindrical portion (8) by extending in the lengthwise direction of the glass tube (7). A cross-sectioned shape of an outer surface (2A) of the cylindrical portion (2) is formed in such a way that it is directed toward the inside of the cylindrical portion (2)at the facing end (8) sides. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a discharge tube with a connector, a connector for the discharge tube, and a surface light source device to which the discharge tube with a connector is attached.

  The discharge tube includes a hollow glass tube, electrodes provided on both ends in the hollow of the glass tube, a lead led out from the electrode to the outside of the glass tube, a sealing portion for sealing the lead, and a glass tube A small amount of mercury (Hg) and helium (He) and other discharge gas filled in and a phosphor applied to the wall surface of the glass tube. The power supply from the power supply circuit to the discharge tube is performed by attaching a harness wire electrically connected to the power supply circuit to the lead of the discharge tube, or by electrically connecting a discharge tube with a connector as in Patent Document 1 below to the power supply circuit. It is known to attach to a holder (conductive holder) that is connected and disposed on a substrate. The discharge tube with connector of Patent Document 1 includes a cylindrical part attached to both ends of the glass tube, a lead-out part derived from the cylindrical part, and a connection part connected to a lead at the tip of the lead-out part. A discharge tube connector is provided at the end of the glass tube. Incidentally, the cylindrical portion, the lead-out portion, and the connection portion are all formed of a conductive material such as metal. Furthermore, the discharge tube with a connector of Patent Document 1 includes a protruding portion formed to provide a gap between the outer peripheral surface of the glass tube and an opposing end portion so as to have a joint portion in the longitudinal direction of the glass tube. An example in which the cylindrical portion is disposed is disclosed.

In such a discharge tube with a connector, partial cooling of the discharge tube can be suppressed by providing a gap between the discharge tube connector and the glass tube. Furthermore, the discharge tube connector has a lead-out portion interposed between the tubular portion and the connecting portion to electrically connect the tubular portion and the connecting portion, and electrically connect the tubular portion and the holder. When the discharge tube with a connector is attached to the holder, the weight of the discharge tube is not directly applied to the lead, so the external force applied to the lead of the discharge tube with the connector is alleviated and the glass tube is cracked between the lead and the glass tube. Can be suppressed.
JP 2008-226846 A

  However, in the surface light source device described in Patent Document 1 having a joint portion in the cylindrical portion, since the discharge tube connector is attached to the outer peripheral surface of the glass tube having a substantially circular cross section, the cross sectional shape of the cylindrical portion is formed in a substantially circular shape. Is done. Further, the distance between the convex portion of the discharge tube connector and the center of the tubular portion in the cited document 1 is formed smaller than the diameter of the tubular portion, and the discharge tube is compared with that before the discharge tube connector is incorporated into the discharge tube. After being assembled in the tube, the cylindrical portion is deformed so that the joint portion of the discharge tube connector is widened. Then, when the cylindrical portion of the discharge tube with a connector is sandwiched between the holders arranged on the substrate, the opposite end of the cylindrical portion scratches the holder, or the opposite end is the opening of the holder (difference). There is a problem that the discharge tube with the cap is difficult to attach to the holder. In order to prevent this problem from occurring, a holder in which the cylindrical portion of the discharge tube with the connector is disposed on the substrate in consideration of the orientation of the abutment portion so that the position of the abutment portion does not contact the holder. Need to be pinched and inserted.

  An object of the present invention is to solve the above problems in a discharge tube with a connector, a connector for the discharge tube, and a surface light source device to which the discharge tube with a connector is attached.

A discharge tube with a connector according to the present invention includes a glass tube, a cylindrical portion attached to an end of the glass tube, and an opposing end provided in the cylindrical portion by extending in the length direction of the glass tube. In the discharge tube having the connector, the cross-sectional shape of the outer surface of the cylindrical portion is formed toward the inner side of the cylindrical portion on the opposite end side.
Furthermore, the discharge tube with a connector according to the present invention has a plurality of projecting portions projecting inward of the cylindrical portion on the inner surface of the cylindrical portion, and a gap is provided between the outer peripheral surface of the glass tube. It is desirable.
Further, in the discharge tube with a connector according to the present invention, the cross-sectional shape of the cylindrical portion is substantially circular, and the distance from the opposite end portion of the outer surface of the cylindrical portion to the central axis of the cylindrical portion is the same as that of the cylindrical portion. Desirably smaller than the diameter of the outer surface.

The discharge tube connector according to the present invention has a cylindrical portion attached to the end of the glass tube,
The inner surface of the cylindrical portion is formed larger than the diameter of the glass tube, and the outer surface of the cylindrical portion is formed toward the inner side of the cylindrical portion at the opposite end portion extending in the length direction of the glass tube. It is characterized by that.
Furthermore, the discharge tube connector has a plurality of projecting portions projecting inward of the tubular portion on the inner surface of the tubular portion, and a gap is provided between the outer peripheral surface of the glass tube. desirable.
Furthermore, it is desirable that the distance between the plurality of protruding portions and the central axis of the cylindrical portion is smaller than the diameter of the glass tube.

A surface light source device of the present invention includes a glass tube, a cylindrical portion attached to an end portion of the glass tube, and an opposing end portion provided in the cylindrical portion by extending in the length direction of the glass tube. And a holder that is electrically connected to the power supply circuit and holds the cylindrical portion and attaches the discharge tube.
Furthermore, in the surface light source device of the present invention, it is preferable that the inner surface of the cylindrical portion has a plurality of protruding portions that protrude toward the inner side of the cylindrical portion.
Further, in the surface light source device of the present invention, the cross-sectional shape of the cylindrical portion is substantially circular, and the distance from the opposite end portion of the outer surface of the cylindrical portion to the central axis of the cylindrical portion is the distance between the outer surface of the cylindrical portion. Desirably smaller than the diameter.

  In the discharge tube with a connector of the present invention, the cross-sectional shape of the outer surface of the cylindrical portion is formed so as to bend inward of the cylindrical portion on the opposite end side, so a connector having an abutment portion is disposed on the glass tube. When the discharged discharge tube with connector is sandwiched between holders electrically connected to the power supply board, the discharge tube with connector can be easily attached to the holder without damaging the holder.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic and different from actual ones. In addition, there may be a case where the dimensional relationships and ratios are different between the drawings. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is to arrange the components and the like as follows. Not specific. The technical idea of the present invention can be variously modified within the scope of the claims.

  1 is a cross-sectional view of an embodiment of a discharge tube connector 1, FIG. 2 is a cross-sectional view of an embodiment of a discharge tube 50 with a connector including the discharge tube connector 1, and FIG. 3 is a discharge tube with a connector including the discharge tube connector 1. FIG. 4 shows a surface light source device 100 in which a discharge tube 50 with a connector is fitted in a holder 102.

(Discharge tube connector)
As shown in FIG. 1, the discharge tube connector 1 of the present embodiment includes a cylindrical portion 2 having a substantially circular shape with a C-shaped cross section, a lead-out portion 3 led out from the cylindrical portion 2, and a discharge tube 50. And a connecting portion 5 connected to the lead 52. Since the cylindrical part 2 forms a gap between the outer peripheral surface of the glass tube 7, the cylindrical part 2 has a protruding part 6 that protrudes inward of the cylindrical part 2 as a gap forming means. A hollow gap is formed between the glass tube 7 and the discharge tube connector 1 between the portion 6 and the protruding portion 6. One protruding portion 6 is provided on the inner surface 2B of the cylindrical portion 2 facing the opposite end portion 8 across the central axis X of the cylindrical portion 2 in the circumferential direction of the cylindrical portion 2, and the cylindrical portion 2 is used as a reference. Each of the cylindrical portions 2 is provided at a position on the inner surface 2B of the cylindrical portion 2 which is shifted from the central axis X of the cylindrical portion 2 by 120 degrees on the left and right (in the circumferential direction). In order to make the central axis of the glass tube 7 substantially the same as the central axis X of the cylindrical part 2, it is desirable to have a plurality of protruding parts 6 in the radial direction of the cylindrical part 2, but only one protruding part 6 But it ’s okay. Furthermore, in order to reduce the contact area between the discharge tube connector 1 and the glass tube 7 as much as possible and suppress the partial cooling of the glass tube 7 by the discharge tube connector 1, the protruding portion 6 is made as a point contact as much as possible. It is desirable that the contact area with 7 is made narrow and the protrusion 6 is as small as possible. However, since the central axis of the glass tube 7 is substantially the same as the central axis X of the cylindrical portion 2, the protruding portions 6 are equally spaced in the circumferential direction of the cylindrical portion 2 and a total of three protruding portions in the circumferential direction. It is desirable to have 6. The protruding portion 6 may be formed by forming a depression on the outer surface 2A of the cylindrical portion 2 and forming a protruding portion on the inner surface 2B, but a movable piece formed by cutting or staking a portion of the cylindrical portion 2 A part of the piece may be bent so that the (or tongue piece) is directed radially inward of the cylindrical portion 2.

The protruding portion 6 of the discharge tube connector 1 contacts the glass tube 7, but in the cylindrical portion 2 before the discharge tube connector 1 is attached to the glass tube 7, the portion of the protruding portion 6 that contacts the glass tube 7 and the cylindrical shape The dimension L1 of the portion 2 with respect to the central axis X (the minimum dimension of the protruding portion 6 from the central axis X of the cylindrical portion 2) L1 is smaller than the diameter R of the outer peripheral surface of the glass tube 7 to which the discharge tube connector 1 is attached.
The cylindrical part 2 formed by rolling a flat metal plate into a cylindrical shape has an opposing end 8 extending in the length direction of the cylindrical part 2 (or the length direction of the glass tube 7), and an opposing end. 8 has an abutment 9 that is a gap between the two. The opposing end portions 8 are not fixed to each other by welding or the like, and the interval between the abutment portions 9 increases when a force is applied, and the discharge tube connector 1 is stressed to reduce the interval between the abutment portions 9 due to the reaction. Is fixed to the glass tube 7 by the stress. When the above-mentioned movable piece is provided on the cylindrical portion 2, the discharge tube connector 1 is fixed to the glass tube 7 only by the elastic stress of the movable piece or by the stress that reduces the interval between the joint portions 9.
The outer surface 2A of the cylindrical portion 2 is cut in the vicinity of the opposed end portion 8 extending in the length direction of the cylindrical portion 2 by bending the inner surface of the cylindrical portion 2 or by chamfering the surface of the outer surface 2A. Heading inside part 2. In the cylindrical portion 2 before the discharge tube connector 1 is attached to the glass tube 7, the dimension L2 from the central axis X of the cylindrical portion 2 to the outer surface 2A of the opposed end portion 8 is from the central axis X of the cylindrical portion 2. It is desirable that the length is shorter than the dimension L3 up to the outer surface 2A facing the opposite end 8 across the central axis X. Further, the discharge tube connector 1 is bent on the inner surface 2B of the opposite end portion 8 of the cylindrical portion 2 on the inner side 2B in the same manner as the outer surface 2A. It may be shaved and directed to the inside of the cylindrical part 2. In this case, the dimension L4 of the portion corresponding to the opposing end 8 from the central axis X of the cylindrical portion 2 is from the central axis X of the cylindrical portion 2 to the inner surface 2A facing the opposing end 8 across the central axis X. It may be shorter than the dimension. In addition, when attaching the discharge tube connector 1 to the glass tube 7, the opposite end portion 8 of the inner surface 2 </ b> B of the tubular portion 2 and the tube are not damaged by the opposite end portion 8 of the inner surface 2 </ b> B of the tubular portion 2. The distance L4 from the central axis X of the shaped part 2 is larger than the diameter R of the outer peripheral surface of the glass tube 7 to which the discharge tube connector 1 is attached.

The end portion 2C different from the opposed end portion 8 of the tubular portion 2 is not longer than the circumferential length of the tubular portion 2 and extends from the end portion of the tubular portion 2 toward the central axis X. The connecting portion 5 is connected to the lead 52 of the discharge tube 51 through the portion 3. The connecting portion 5 extends in the direction of the central axis X of the cylindrical portion 2 and has a structure that can easily fix the lead 52 of the discharge tube 51 by soldering or welding. For example, the connection portion 5 before being connected to the lead 52 of the discharge tube 51 is a flat plate and has a V-shaped, U-shaped, or C-shaped cross-sectional shape. In order to make a good connection with the lead 52 by soldering or welding, it is desirable that the connecting portion 5 extends in the direction in which the lead 52 extends.
The lead-out part 10 is preferably at least one so that a force from the outside to the cylindrical part 2 propagates to the lead 52 of the discharge tube 51 and does not cause a crack in the sealing part of the glass tube 7 in contact with the lead 52. It is desirable to have a refracting portion (or a curved portion) at two or more different locations, and a portion that refracts so as to extend from the end of the cylindrical portion 2 toward the central axis X of the cylindrical portion 2; It is desirable to have at least two refracting portions (or curved portions) that are refracted so as to be connected to the connecting portion 5 extending in parallel with the central axis X of the cylindrical portion 2.
The cylindrical part 2, the lead-out part 3, and the connection part 5 are formed of a conductive material, and the cylindrical part 2, the lead-out part 10, and the connection part 5 are a single metal flat plate such as a Ni-plated Cu plate or a stainless steel plate. It may be formed from. Moreover, at least any one of the cylindrical part 2, the derivation | leading-out part 3, and the connection part 5 may be formed with another metal flat plate, and may mutually be fixed by welding.

(Discharge tube with connector)
As shown in FIGS. 2 and 3, the discharge tube 50 with a connector of the present embodiment is obtained by attaching the above-described discharge tube connector 1 to the end of a hollow glass tube 7. At both ends of the glass tube 7, there are electrodes (not shown) arranged in the hollow of the glass tube 7, and leads 52 welded to the electrodes and one end and extending to the outside of the glass tube 7. Yes. The connecting portion 5 of the discharge tube connector 1 has an annular, V-shaped, U-shaped, and C-shaped cross-sectional shape, has an extended end extending along the lead 52, and includes at least welding, caulking, and soldering. One, more preferably, caulking and welding are performed to connect to the lead 52.
In order not to apply a load to the lead 52, it is desirable that the lead 52 is not bent and extends parallel to the central axis X of the tubular portion 2. The lead 52 is provided to the connecting portion 5 of the discharge tube connector 1 having an annular, V-shaped, U-shaped, or C-shaped cross-sectional shape. The end of the lead 52 extends farther from the tubular portion 2 than the connecting portion 5 in order to connect the lead 52 well with the connecting portion 5, and when the lead 52 is fixed by caulking, the tip of the lead 52 Is more distant from the tubular part 2 than the connecting part 5. The connecting portion 5 of the discharge tube connector 1 and the lead 52 of the discharge tube 51 are fixed mechanically and electrically well by caulking, soldering or welding. As shown in FIG. 2, the connection part 5 is provided continuously from the first part (5a) formed over the entire circumference of the lead and the first part 5a, and the inner surfaces of the connection parts are connected to each other. It is desirable to have the 2nd end part 5b which connected. By having the second end portion (5b) of the connection portion, the lead 52 and the connection portion 5 can be reliably connected.

The protruding portion 6 provided on the inner surface 2B of the tubular portion 2 of the discharge tube connector 1 abuts on the outer wall surface of the glass tube 7, and a space (gap) is formed between the tubular portion 2 and the outer wall surface of the glass tube 7. Has occurred. Before the discharge tube connector 1 is attached to the glass tube 7, the dimension L <b> 1 from the central axis X of the cylindrical portion 2 to the protruding portion 6 that contacts the glass tube 7 is formed smaller than the diameter R of the glass tube 7. Therefore, when the discharge tube connector 1 is attached to the glass tube 7, the cylindrical portion 2 is deformed so that the width of the abutting portion 9 is further expanded, and a stress that narrows the width of the abutting portion 9 is generated. Moreover, since the cylindrical part 2 is cyclic | annular or C-shaped, compared with the state before attaching to the discharge tube 51, the opposing edge part 8 of the outer surface 2A of the cylindrical part 2 attached to the glass tube 7 is the cylindrical part 2. In the cylindrical part 2 having a substantially circular or elliptical cross-sectional shape, for example, the opposite end 8 is the most in the dimension of the outer surface 2A from the central axis X. It's not big.
In the discharge tube 50 with a connector, the opposing end 8 of the inner surface 2B of the cylindrical portion 2 and the central axis X of the cylindrical portion 2 so as not to damage the glass tube 7 at the opposing end 8 of the inner surface 2B of the cylindrical portion 2. Is larger than the diameter R of the outer peripheral surface of the glass tube 7 to which the discharge tube connector 1 is attached.
Further, in the discharge tube 50 with a connector, the opposing end portion 8 of the outer surface 2A of the tubular portion 2 faces the inside of the tubular portion 2, and the tubular portion 2 having a virtual substantially cylindrical shape (dotted line in FIG. 2). The opposite end portion 8 of the outer surface 2A of the cylindrical portion 2 is disposed on the inner side than the cylindrical portion.

(Surface light source device)
As shown in FIG. 4, the surface light source device 100 of the present embodiment includes a substrate 101, a holder 102 attached to the substrate 101, and the aforementioned discharge tube 50 with a connector in which the cylindrical portion 2 is fitted into the holder 102. Have.
The holder 102 is electrically connected to an output terminal of a power supply circuit (not shown), and has a function of electrically connecting the cylindrical portion 2 of the discharge tube 50 with a connector and the output terminal of the power supply circuit. The tubular portion 2 of the tube 50 is sandwiched and interposed between the power supply circuit and the substrate, and has a function of mechanically fixing. Before attaching the discharge tube 50 with the connector, the holder 102 is narrower than the diameter of the outer surface 2A of the tubular portion 2 so as to sandwich the tubular portion 2 of the discharge tube 50 with the connector, and comes into contact with the outer surface 2A of the tubular portion 2. An abutting portion 103 is provided on the inner side, a fixing portion 104 fixed to one end of the abutting portion 103 is fixed to the substrate 101, and the cylindrical portion 2 is fitted into the holder 102 at the other end opposite to the one end of the abutting portion 103. And a plug-in portion 105.
When the discharge tube 50 with a connector is attached to the holder 102, the contact portion 103 of the holder 102 is deformed and the tubular portion 2 of the discharge tube 50 with the connector is sandwiched by the repulsive force. The repulsive force generated in the holder 102 also acts as a stress that narrows the interval between the joint portions 9 from the outside of the reduced diameter elastic force of the cylindrical portion 2, and the holder 102 holds the cylindrical portion 2 and the glass tube 7 well.
The cylindrical portion 2 is bent inward toward the opposing end portion 8 of the outer surface 2A, and the opposing end portion 8 of the outer surface 2A is not the longest dimension from the central axis of the cylindrical portion 2 in the outer surface 2A. It does not protrude to the outermost side in the outer surface 2A of the cylindrical portion 2. Therefore, when the discharge tube with connector 50 is sandwiched between the holders 102 disposed on the substrate 101, the discharge tube with connector 50 can be easily attached to the holder 102 without damaging the holder 102 at the opposite end 8. At this time, the distance L4 between the opposite end 8 of the inner surface 2B of the cylindrical portion 2 and the central axis X of the cylindrical portion 2 is larger than the diameter R of the outer peripheral surface of the glass tube 7 to which the discharge tube connector 1 is attached. Therefore, the outer peripheral surface of the glass tube 7 is not damaged by the inner surface 2B of the cylindrical portion 2.

(Second Embodiment)
The discharge tube with a connector according to the second embodiment of the present invention is the connection portion 5 and the lead 52 of the discharge tube connector 1 attached to the lead 52 of the discharge tube in the discharge tube with a connector 50 according to the first embodiment. The example which changed the connection method with the connection part 5 is demonstrated. When the connecting portion 5 of the discharge tube connector 1 according to the second embodiment of the present invention has a flat plate shape extending along the lead 52, as shown in FIG. 5, nickel (Ni) that can be melted by welding. The connecting portion 5 and the lead 52 may be fixed by welding using a tubular welding member 4 made of a metal material such as plated copper (Cu) or stainless steel. The hollow portion of the welding member 4 only needs to be able to insert the connection portion 5 and the lead 52, and the connection portion 5 and the lead 52 come into contact with each other or have a slight gap by attaching the welding member 4. The shape is not necessarily circular. By inserting the cylindrical welding member 4 in this way, the connection portion 5 and the lead 52 can be reliably welded without the lead 52 and the connection portion 5 being separated by the elasticity of the lead-out portion 3.

(Third embodiment)
The discharge tube with connector according to the third embodiment of the present invention is for the discharge tube attached to the lead-out portion 3 of the discharge tube connector 1 and the lead 52 of the discharge tube in the discharge tube with connector 50 according to the first embodiment described above. An example in which the connection part 5 of the connector 1 and the connection method between the lead 52 and the connection part 5 are changed will be described. As shown in FIGS. 6 and 7, the discharge tube 50 with a connector according to the third embodiment of the present invention extends from the end of the tubular portion 2 in the circumferential direction of the tubular portion 2 rather than along the lead 52. The base end side from which the lead-out portion 3 is bent and formed along the side face of the lead 53 and the lead 53 from which the lead-out portion 3 is led out from the tubular portion 2 beyond the lead. And a connecting portion 5 formed toward the front. According to the present embodiment, since the lead-out portion 3 can move with elasticity in the direction of caulking, the external force applied to the lead 52 of the discharge tube with connector 50 is relaxed, and the lead 52 and the glass tube 7 It is possible to prevent the glass tube 7 from cracking from the middle. In addition, as shown in FIG. 6, before extending from the edge part of the cylindrical part 2 to the circumferential direction of the cylindrical part 2, the 1st part derived | led-out to the direction of the lead | read | reed 52 is provided, and a cylinder is started from a 1st part. It is good also as a 2nd part extended in the circumferential direction of the shape part 2. FIG. Thereby, even if the end of the glass tube 7 is inserted more than the end of the cylindrical portion 2 toward the connection portion 5, the glass tube 7 is damaged at the lead-out portion 3 or the connection portion 5. Can be prevented.

Sectional drawing of one Example of the connector 1 for discharge tubes in this invention is shown. Sectional drawing of one Example of the discharge tube 50 with a connector provided with the connector 1 for discharge tubes in this invention is shown. The perspective view of one Example of the discharge tube 50 with a connector provided with the connector 1 for discharge tubes in this invention is shown. A sectional view of a surface light source device in which a discharge tube with connector 50 according to the present invention is fitted in a holder 102 is shown. The side view of 2nd Embodiment of the discharge tube 50 with a connector which welded the lead | read | reed 52 and the connection part 5 using the ring-shaped metal welding material 4 in this invention is shown. The side view of 3rd Embodiment of the discharge tube 50 with a connector is shown. Sectional drawing of 3rd Embodiment of the discharge tube 50 with a connector is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, Connector for discharge tubes 2, Cylindrical part 3, Derived part 4, Welding member 5, Connection part 6, Projection part 7, Glass tube 8, Opposite end part 9, Abutment part 50, Discharge tube with connector 100, Surface light source device 101, substrate 102, holder

Claims (9)

A glass tube,
A connector having a cylindrical part attached to an end of the glass tube, and an opposing end provided in the cylindrical part extending in the length direction of the glass tube;
In a discharge tube having
A discharge tube with a connector, wherein a cross-sectional shape of an outer surface of the cylindrical portion is formed toward an inner side of the cylindrical portion on the opposite end side. The inner surface of the cylindrical part has a plurality of protruding parts protruding toward the inner side of the cylindrical part, and a gap is provided between the outer peripheral surface of the glass tube. 1 discharge tube with connector. The cross-sectional shape of the cylindrical part is substantially circular, and the distance from the opposing end of the outer surface of the cylindrical part to the central axis of the cylindrical part is smaller than the diameter of the outer surface of the cylindrical part. The discharge tube with a connector according to claim 1 or 2. It has a cylindrical part attached to the end of the glass tube,
The inner surface of the cylindrical part is formed larger than the diameter of the glass tube,
The outer surface of the cylindrical part is formed toward the inner side of the cylindrical part at an opposing end extending in the length direction of the glass tube. The inner surface of the cylindrical part has a plurality of protruding parts protruding toward the inner side of the cylindrical part, and a gap is provided between the outer peripheral surface of the glass tube. 4 discharge tube connector. 6. The discharge tube connector according to claim 5, wherein a distance between the plurality of projecting portions and a central axis of the cylindrical portion is smaller than a diameter of the glass tube. A glass tube,
A connector having a cylindrical part attached to an end of the glass tube, and an opposing end provided in the cylindrical part extending in the length direction of the glass tube;
A discharge tube with a connector,
A holder that is electrically connected to a power supply circuit and holds the discharge tube by sandwiching the tubular portion;
A surface light source device. The inner surface of the cylindrical part has a plurality of protruding parts protruding toward the inner side of the cylindrical part, and a gap is provided between the outer peripheral surface of the glass tube. 7. A surface light source device. The cross-sectional shape of the cylindrical part is substantially circular, and the distance from the opposing end of the outer surface of the cylindrical part to the central axis of the cylindrical part is smaller than the diameter of the outer surface of the cylindrical part. The surface light source device according to claim 7 or 8.

Images