JP5111188B2 - Power supply terminal for external electrode discharge lamp and light source device - Google Patents

Description

  The present invention relates to an external electrode discharge lamp power supply terminal attached to an electrode of an external electrode discharge lamp, and a light source device using the external electrode discharge lamp power supply terminal.

  Conventionally, external electrode discharge lamps have been used as backlights for liquid crystal displays, document reading light sources for scanners, and illumination light sources. This external electrode discharge lamp has a long cylindrical discharge tube filled with a discharge gas such as mercury, and electrodes covering the outer peripheral surfaces of both ends of the discharge tube. A metal tape such as a tape or a conductive paste such as a silver paste is used. When a high frequency high voltage is applied to the electrodes at both ends of the discharge tube, a discharge is generated in the discharge tube, and the external electrode discharge lamp is turned on.

  Moreover, in order to connect an electrode to a power supply, a power feeding terminal may be attached to the outer peripheral surface of the electrode. Various power supply terminals have been proposed.

  For example, the power supply terminals disclosed in Patent Document 1 and Patent Document 2 are formed in a shape that sandwiches the surface of the electrode from both sides, and contact the outer peripheral surface of the electrode at at least two points. The power supply terminal is fixed to the power supply device in advance, and the power supply terminal and the electrode are connected by fitting the end of the external electrode discharge lamp into the power supply terminal.

  Further, the power supply terminal disclosed in Patent Document 3 has a recess that fits the outer shape of the end of the external electrode discharge lamp, and the end of the external electrode discharge lamp is accommodated in this recess, The electrode and the power supply terminal are connected. In addition, a conductive paste is filled in a gap between the power supply terminal and the outer peripheral surface of the electrode in order to bring the power supply terminal and the outer peripheral surface of the electrode into close contact with each other. In addition to the power supply function, the power supply terminal of Patent Document 3 also has a function of dissipating heat from the electrodes.

  Patent Document 4 discloses an electrode that also serves as a power feeding terminal. The electrode includes a metal tape attached to the outer peripheral surface of both ends of the discharge tube via a conductive adhesive, a metal cylindrical member attached to the outer peripheral surface of the metal tape, and one of the cylindrical members. And a support provided in the section. The support is formed with a hole for fixing to a device or the like. Moreover, the cylinder member has a slit in a part in the circumferential direction. After the cylindrical member is attached to both ends of the discharge tube by interposing a metal tape with a conductive adhesive attached between the cylindrical member and the outer peripheral surface of the discharge tube, the cylindrical member The position can be finely adjusted in the axial direction.

JP 2006-147298 A JP 2006-286448 A (FIG. 2) Japanese Patent No. 3494090 Japanese Patent No. 3927107 (FIG. 6)

  However, since the power supply terminals of Patent Documents 1 and 2 have a shape in which the outer peripheral surface of the electrode is sandwiched from both sides, the contact area with the electrode is small and the fastening force is not sufficient, so that the electrical connection is unstable.

  In addition, when attaching the power supply terminal of Patent Document 3 to the electrode, it is necessary to dry and harden after filling the gap between the power supply terminal and the outer peripheral surface of the electrode with a paste-like conductive paste. It takes time. In addition, since the conductive paste slightly shrinks when cured, a slight gap is generated between the cured conductive paste and the outer peripheral surfaces of the power supply terminal and the electrode. For this reason, the electrical resistance between the power supply terminal and the electrode is increased.

  In the case of the electrode serving also as the power supply terminal of Patent Document 4, it is difficult to attach the cylindrical member in close contact with the outer peripheral surface of the metal tape attached to the outer peripheral surface of the discharge tube.

  Therefore, an object of the present invention is to provide a power supply terminal for an external electrode discharge lamp that has good contact with the electrode and can be easily attached to the electrode, and a light source device using the power supply terminal for the external electrode discharge lamp Is to provide.

Means for Solving the Problems and Effects of the Invention

The power supply terminal for external electrode discharge lamp of the present invention is a power supply terminal for external electrode discharge lamp made of one metal plate attached to the electrode of the external electrode discharge lamp having an electrode covering the outer peripheral surface of the discharge tube. The electrode is wound more than one turn along the circumferential direction of the outer peripheral surface of the electrode without overlapping in the radial direction , and the vicinity of one end and the other end in the circumferential direction are arranged in parallel in the axial direction. A winding portion that is connected to the one end of the winding portion, a first protrusion extending in a direction away from the outer peripheral surface, and the other end of the winding portion; A second protrusion extending in a direction away from the outer peripheral surface.

  According to the power supply terminal for an external electrode discharge lamp of the present invention, the electrode is mounted by attaching one of the first protrusion and the second protrusion extending in a direction away from the outer peripheral surface of the electrode to a power supply device or the like. Can be electrically connected to a power source. Further, when attaching the power supply terminal to the outer peripheral surface of the electrode, a finger is put on the first projecting portion and the second projecting portion, and force is applied to both projecting portions to expand the diameter of the winding portion. In this state, the end of the discharge tube is inserted inside the winding portion to release the force applied to the protruding portion, the winding portion is reduced in diameter, and the winding force is reduced by the restoring force in the reduced diameter direction. The turning part is brought into close contact with the outer peripheral surface of the electrode. Thus, by using the 1st protrusion part and the 2nd protrusion part which were respectively connected with the both ends of the circumferential direction of the winding part, a feed terminal can be simply attached to the outer peripheral surface of an electrode. In addition, since the restoring force (spring force) in the reduced diameter direction of the winding portion is securely adhered to the outer peripheral surface of the electrode, the power supply terminal and the electrode are electrically and stably connected. Further, the vicinity of one end and the vicinity of the other end of the winding part are arranged in parallel in the axial direction without overlapping in the radial direction, so that the winding part is in close contact with the outer peripheral surface of the electrode over the entire circumference. The spring force of the winding portion acting on the outer peripheral surface is uniform.

  The vicinity of the one end of the winding portion is divided into two parallel regions separated from each other in the axial direction, and the vicinity of the other end of the winding portion extends between the two regions in parallel therewith. The first protrusion may have two legs connected to the two regions, and a connecting part that connects the two legs to each other.

According to this configuration, two regions that are separated from each other in the axial direction and that extend between these two regions are formed near both ends of the winding portion. Therefore, the diameter of the winding part can be expanded substantially uniformly in the axial direction by bringing the protrusions respectively connected to both ends of the winding part close to each other. Therefore, the spring pressure of the winding part acting on the outer peripheral surface of the electrode can be made uniform.
Furthermore, since each of the first projecting portion and the second projecting portion is provided one by one, it is easy to put a finger on both projecting portions and apply force when expanding the diameter of the winding portion. Therefore, it is easy to attach the power supply terminal to the outer peripheral surface of the electrode.

  Further, the vicinity of the other end of the winding part is divided into two parallel regions separated in the axial direction, and the vicinity of the one end of the winding part is parallel to the two regions. There may be provided two second projecting portions connected to the two regions.

  According to this configuration, two regions that are separated from each other in the axial direction and that extend between these two regions are formed near both ends of the winding portion. Therefore, the diameter of the winding part can be expanded substantially uniformly in the axial direction by bringing the protrusions respectively connected to both ends of the winding part close to each other. Therefore, the spring pressure of the winding part acting on the outer peripheral surface of the electrode can be made uniform.

  Furthermore, a slit extending in the circumferential direction may be formed in the winding part. According to this configuration, the spring pressure (load) can be made more uniform over the entire winding portion with respect to the electrode.

A light source device according to the present invention includes an external electrode discharge lamp having an electrode covering an outer peripheral surface of a discharge tube, and a power supply terminal for an external electrode discharge lamp made of one metal plate attached to the electrode. The external electrode discharge lamp power supply terminal is wound more than one turn along the circumferential direction of the outer peripheral surface of the electrode without overlapping in the radial direction , and one end in the circumferential direction. A winding portion in which the vicinity and the vicinity of the other end are arranged in parallel in the axial direction, and a first protrusion that is connected to one end of the winding portion in the circumferential direction and extends in a direction away from the outer peripheral surface And a second protrusion that is connected to the other end of the winding portion in the circumferential direction and extends in a direction away from the outer peripheral surface.

According to the light source device of the present invention, the electrode is electrically connected to the power source by attaching one of the first protrusion and the second protrusion extending in the direction away from the outer peripheral surface of the electrode to the power supply device or the like. Can be connected. Further, when attaching the power supply terminal to the outer peripheral surface of the electrode, a finger is put on the first projecting portion and the second projecting portion, and force is applied to both projecting portions to expand the diameter of the winding portion. In this state, the end of the discharge tube is inserted inside the winding portion to release the force applied to the protruding portion, the winding portion is reduced in diameter, and the winding force is reduced by the restoring force in the reduced diameter direction. The turning part is brought into close contact with the outer peripheral surface of the electrode. Thus, by using the 1st protrusion part and the 2nd protrusion part which were respectively connected with the both ends of the circumferential direction of the winding part, a feed terminal can be simply attached to the outer peripheral surface of an electrode. In addition, since the restoring force (spring force) in the reduced diameter direction of the winding portion is securely adhered to the outer peripheral surface of the electrode, the power supply terminal and the electrode are electrically and stably connected. Furthermore, since the winding portion is wound without overlapping in the radial direction, the winding portion is in close contact with the outer peripheral surface of the electrode over one turn, and the spring force of the winding portion acting on the outer peripheral surface of the electrode Becomes uniform.

<First Embodiment>
The first embodiment of the present invention will be described below. FIG. 1 is a diagram schematically illustrating the light source device according to the first embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a perspective view of a power supply terminal for an external electrode discharge lamp used in the light source device of the first embodiment.

  As shown in FIG. 1, a light source device 1 according to this embodiment includes an external electrode discharge lamp 2 and an external electrode discharge lamp power supply terminal (hereinafter simply referred to as an electrode discharge lamp 2) attached to an electrode 4 (to be described later) of the external electrode discharge lamp 2. 5) and an inverter power source 9 connected to the electrode 4 through the power supply terminal 5.

  The external electrode discharge lamp 2 has a discharge tube 3 and two electrodes 4 that cover the outer peripheral surface in the vicinity of both ends in the longitudinal direction (left-right direction in FIG. 1) of the discharge tube 3. As shown in FIGS. 1 and 2, the discharge tube 3 is a cylindrical glass tube extending in the left-right direction in FIG. 1, and both ends thereof are sealed. In addition, the material which comprises the discharge tube 3 is not specifically limited to glass, You may use another material, as long as it transmits light like quartz glass.

  In the space inside the discharge tube 3, for example, a discharge gas containing a mixed gas of a rare gas such as argon gas and a metal vapor such as mercury vapor is sealed at a low pressure of 1 to 60 Torr, for example. Additives are added to the discharge gas as needed.

  A phosphor layer (not shown) having a thickness of, for example, several μm to several tens of μm is formed on the inner wall surface of the discharge tube 3 as necessary. As the phosphor layer, one that exchanges ultraviolet rays with light in a wide wavelength range in the visible light region is used. However, depending on the application of the light source device 1, light in a specific wavelength region that is not limited to the visible light region is used. What to convert may be used. Further, when the external electrode discharge lamp 2 is an ultraviolet lamp or the like that emits ultraviolet rays, the phosphor layer need not be formed.

  The outer peripheral surfaces in the vicinity of both ends in the longitudinal direction of the discharge tube 3 are each covered with a layered electrode 4. The electrode 4 is formed of, for example, a conductive paste or a metal tape such as a copper tape or an aluminum tape.

  When the electrode 4 is formed of a conductive paste, a conductive paste such as a silver paste or a copper paste obtained by adding a conductive agent such as silver particles or copper particles to a paste-like organic binder, dipping, brushing, printing By a coating method such as vapor deposition, it is applied to a predetermined position on the outer peripheral surface of the discharge tube 3 to a thickness of, for example, several μm to several tens of μm (preferably, for example, 10 μm), and is dried and solidified. The conductive paste may be selected in consideration of high adhesiveness to the discharge tube 3, little deterioration due to ultraviolet rays, and sufficiently high conductivity, and is not limited to silver paste or copper paste, but may be nickel paste Gold paste or carbon paste may be used.

  When the electrode 4 is formed of a metal tape, the metal tape is wound around a predetermined position of the discharge tube 3.

  If the width of the electrode 4 is increased (the area is increased), the amount of current that flows even at the same voltage increases, so the luminance of the external electrode discharge lamp 2 increases. However, since the area of the light emitting portion of the external electrode discharge lamp 2 decreases, the total luminous flux decreases at a certain point. Therefore, the width (area) of the electrode 4 with respect to the length (area) in the longitudinal direction of the discharge tube 3 needs to be set in an appropriate range. For example, when the discharge tube 3 is made of soft glass having a glass diameter of 9.8 mm, a glass thickness of 0.55, and an axial length of 225 mm, the width of the electrode 4 is suitably 10 to 20 mm.

  A power supply terminal 5 is attached to the outer peripheral surface of the electrode 4. As shown in FIG. 2, the power supply terminal 5 includes a winding part 10, a first projecting part 11, and a second projecting part 12.

  The power supply terminal 5 is made of a single metal plate. Examples of the metal plate material include beryllium steel, phosphor bronze, stainless steel, and the like excellent in electrical conductivity and thermal conductivity. In addition, as the metal plate material, one having a small thickness and low rigidity is used.

  As shown in FIGS. 2 and 3, the winding part 10 is wound around the outer peripheral surface of the electrode 4 in excess of one turn along the circumferential direction. The winding angle along the circumferential direction of the winding part 10 is preferably within 450 °. In addition, as shown in FIG. 2, in this embodiment, the winding angle along the circumferential direction of the winding part 10 is 450 degrees. Further, as shown in FIG. 1, the length of the winding portion 10 in the axial direction (left-right direction in FIG. 1) is shorter than the axial length of the electrode 4, and the winding portion 10 is the central portion in the axial direction of the electrode 4. Is attached. Therefore, both end portions in the axial direction of the electrode 4 are exposed. Further, the inner diameter of the winding portion 10 that is not attached to the electrode 4 of the external electrode discharge lamp 2 and is not subjected to external force is slightly smaller than the outer diameter of the electrode 4. Therefore, the winding part 10 is in close contact with the outer peripheral surface of the electrode 4 by its spring force.

  The vicinity of the end portion 10a in the circumferential direction of the winding portion 10 is divided into two regions separated in the axial direction. These two regions are referred to as a winding end portion 13. The two winding end portions 13 extend in the circumferential direction, and the axial length is constant over the circumferential direction. Therefore, the two winding end portions 13 extend in parallel to each other.

  Further, a winding end portion 14 having a short axial length is formed in the vicinity of the end portion 10b opposite to the end portion 10a of the winding portion 10. The axial length of the winding end portion 14 is constant over the circumferential direction. The circumferential length of the winding end portion 14 is substantially the same as that of the winding end portion 13. The winding end portion 14 extends between the two winding end portions 13 in parallel therewith.

  The 1st protrusion part 11 is connected with the edge part 10a. That is, the first protrusion 11 is connected to the two winding end portions 13. The first projecting portion 11 extends in the radial direction of the winding portion 10 and in a direction away from the outer peripheral surface of the electrode 4. The first projecting portion 11 has two leg portions 15 respectively connected to the two winding end portions 13 and a connecting portion 16 that connects the two leg portions 15 to each other. The length of the connecting portion 16 in the axial direction (left-right direction in FIG. 1) is changed with respect to the extending direction, and the axial length on the distal end side is shorter than the axial length on the leg portion 15 side. Further, a circular hole 11a penetrating in the thickness direction is formed on the distal end side of the connecting portion 16. The circular hole 11a functions as a retaining element for the power feeding element 5 when the power feeding terminal 5 is attached to the external power connection terminal 7 described later.

  Moreover, the 2nd protrusion part 12 is connected with the edge part 10b. That is, the second protrusion 12 is connected to the winding end 14. The second projecting portion 12 extends in the radial direction of the winding portion 10 and in a direction away from the outer peripheral surface of the electrode 4. The length (projection amount) of the second projecting portion 12 in the extending direction is shorter than the length of the first projecting portion 11 in the extending direction.

  The power supply terminal 5 is formed by the following procedure using a single metal plate. As shown in FIG. 4, the corners of both ends in the longitudinal direction (vertical direction in FIG. 4) of one flat rectangular metal plate member are cut off, and the leading end portion of the connecting portion 16 and the second portion The part which becomes the protrusion part 12 and the winding-end part 14 is formed, respectively. Further, a slit extending in the longitudinal direction is formed in the vicinity of the connecting portion 16. Thereby, the part used as the leg part 15 and the winding-end part 13 of the 1st protrusion part 11 is formed. Next, the first projecting portion 11 and the second projecting portion 12 are formed by being bent vertically in the same direction at two positions 10a and 10b indicated by broken lines in FIG. Then, the wound portion 10 is formed by winding and bending the region between the two bent portions more than one turn around the core material. The manufacturing procedure of the power supply terminal 5 is not particularly limited to the above procedure.

  When attaching the power supply terminal 5 to the outer peripheral surface of the electrode 4, the first protrusion 11 and the second protrusion 12 are brought close to each other by placing a finger on the first protrusion 11 and the second protrusion 12. A force is applied in the direction (arrow direction in FIG. 3) to expand the diameter of the winding part 10. In this state, after inserting the end portion of the discharge tube 3 inside the winding portion 10, the force applied to the projecting portions 11 and 12 is released, and the winding portion 10 is reduced in diameter. And the winding part 10 is closely_contact | adhered to the outer peripheral surface of the electrode 4 with the restoring force of the diameter reduction direction of the winding part 10. FIG. Thus, the feed terminal 5 can be easily attached to the outer peripheral surface of the electrode 4 by using the first protrusion 11 and the second protrusion 12 respectively connected to the both ends 10 a and 10 b of the winding part 10. be able to. In addition, the power supply terminal 5 and the electrode 4 are electrically and stably connected to each other because the restoring force (spring force) in the diameter reducing direction of the winding portion 10 is securely adhered to the outer peripheral surface of the electrode 4.

  Further, the winding part 10 is wound more than one turn along the circumferential direction of the outer peripheral surface of the electrode 4, and is closely attached to the outer peripheral surface of the electrode 4 over the entire periphery. The contact area with the electrode 4 is larger than that of the power supply terminal sandwiched from both sides. For this reason, a large current can flow stably through the electrode 4. Further, since the contact area between the electrode 4 and the power supply terminal 5 is large, heat generated in the electrode 4 when a high voltage is applied to the electrode 4 can be further dissipated.

  As described above, in the vicinity of both end portions 10 a and 10 b of the winding portion 10, two winding end portions 13 that are spaced apart in the axial direction and parallel to each other, and the winding ends that extend between these two winding end portions 13. Each part 14 is formed. Therefore, the diameter of the winding part 10 can be expanded substantially uniformly in the axial direction by bringing the protrusions 11 and 12 connected to the both end parts 10a and 10b close to each other. Therefore, the spring pressure of the winding part 10 acting on the outer peripheral surface of the electrode 4 can be made uniform. In particular, as in the present embodiment, the vicinity of both end portions (winding end portions 13 and 14) in the circumferential direction of the winding portion 10 are juxtaposed in the axial direction without overlapping with respect to the radial direction. Since 10 is in close contact with the outer peripheral surface of the electrode 4 over one turn, the spring force of the winding portion acting on the outer peripheral surface of the electrode 4 can be made uniform.

  Moreover, when the winding angle of the winding part 10 is within 450 ° as described above, when the diameter of the winding part 10 is increased, a finger is put on the first projecting part 11 and the second projecting part 12. Easy and easy to apply force.

  Moreover, since the 1st protrusion part 11 and the 2nd protrusion part 12 are each comprised by one member, when expanding the winding part 10, the 1st protrusion part 11 and the 2nd protrusion part It is easy to put a finger on 12 and apply force. Moreover, the diameter expansion amount of the winding part 10 becomes constant over the axial direction. Therefore, it is easy to attach the winding part 10 to the outer peripheral surface of the electrode 4.

  As shown in FIG. 1, the entire outer periphery of the winding portion 10, the exposed portions at both axial ends of the outer peripheral surface of the electrode 4, and the exposed portion of the outer peripheral surface of the discharge tube 3 that is close to the electrode 4 are It is covered with an insulating covering material 6. Thereby, when a high voltage is applied to the electrode 4, corona discharge generated at the boundary between the exposed portion close to the electrode 4 on the outer peripheral surface of the discharge tube 3 and both end portions in the axial direction of the electrode 4 can be suppressed. The generation of ozone due to corona discharge can be reduced. The covering material 6 is provided at both ends in the axial direction of the winding portion 10, exposed portions at both ends in the axial direction of the outer peripheral surface of the electrode 4, and both ends in the axial direction of the electrode 4 among the outer peripheral surfaces of the discharge tube 3. You may provide so that only the adjacent exposed part may be coat | covered.

  In addition, as shown in FIG. 5, the first protrusion 11 is inserted into a box-shaped external power supply connection terminal 7 provided on the substrate 8. At this time, a convex portion (not shown) provided in the external power connection terminal 7 and a circular hole 11a formed in the first projecting portion 11 are fitted to serve to prevent the power supply terminal 5 from coming off. The external power supply connection terminal 7 is connected to the inverter power supply 9. Therefore, the electrode 4 is connected to the inverter power supply 9 by inserting the first protrusion 11 into the external power supply connection terminal 7. Thus, the first protrusion 11 is used for electrical connection between the electrode 4 and the external power connection terminal 7. In FIG. 5, the covering material 6 is omitted.

  The inverter power supply 9 is a power supply circuit that converts, for example, a DC power supply obtained by rectifying a commercial power supply or a DC power supply (for example, a DC 8V power supply) supplied from a battery power supply or the like into a high frequency high voltage of 40 to 100 kHz and a voltage of 2000V. is there.

  When a high frequency high voltage is applied to the electrode 4 from the inverter power supply 9 through the power supply terminal 5, a high frequency current is supplied into the discharge tube 3 through the wall of the glass (discharge tube 3) inside the electrode 4. The As a result, a discharge phenomenon occurs in the discharge tube 3 and the external electrode discharge lamp 2 emits light. At this time, since the discharge tube 3 and the electrode 4 and the electrode 4 and the winding part 10 are in close contact with each other, a gap is generated between them or a local discharge is generated by contact in a point. There is no fear.

  Instead of the power supply terminal 5 of the present embodiment, as shown in FIG. 6, a power supply terminal 105 in which a slit 10 c extending in the circumferential direction is formed at the center in the circumferential direction of the winding part 10 may be used. In the case of the power supply terminal 5 not provided with a slit, the contact area between the winding part 10 and the outer peripheral surface of the electrode 4 can be increased, which is useful in terms of electrical contact and heat dissipation. However, by not providing the slit, the rigidity of the winding part 10 is increased, and the spring pressure (load) of the winding part 10 acting on the outer peripheral surface of the electrode 4 may be uneven. On the other hand, in the case of the power supply terminal 105 in which the slit 10c is formed, the contact area with the electrode 4 is reduced, but the formation of the slit 10c causes the entire winding part 10 including the winding end parts 13 and 14 to The spring pressure (load) acting on the outer peripheral surface can be made more uniform. In this case, although the spring pressure (load) is lowered by the formation of the slit 10c, it can be adjusted by changing the thickness of the metal plate material.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 7 is a perspective view of a power supply terminal used in the light source device of the second embodiment. Note that the light source device of the present embodiment is the same as that of the first embodiment except that the power supply terminals are different, and the others (configuration of the external electrode discharge lamp 2). Accordingly, components similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 7, the power supply terminal 205 of this embodiment includes a winding part 210, a first protrusion 211, and two second protrusions 212. The power supply terminal 205 is formed from a single metal plate material, similar to the power supply terminal 5 of the first embodiment.

  The winding part 210 is wound more than one turn along the circumferential direction of the outer peripheral surface of the electrode 4. The axial length of the winding part 210, the inner diameter in an unloaded state, and the attachment position are the same as those of the winding part 10 of the first embodiment. Further, the winding angle of the winding part 210 is preferably within 450 ° as in the first embodiment, and is 420 ° in this embodiment. In addition, a slit 210c extending in the circumferential direction is formed in the central portion of the winding portion 210 in the circumferential direction. Although not shown, it is preferable that there is no slit as in the case of the power supply terminal 5 of the first embodiment in that the contact area with the electrode 4 can be increased.

  A winding end portion 217 having a short axial length is formed in the vicinity of the end portion 210 a in the circumferential direction of the winding portion 210. The winding end portion 217 extends along the circumferential direction, and the axial length of the winding end portion 217 is constant over the circumferential direction.

  The vicinity of the end 210b opposite to the end 210a of the winding part 210 is divided into two regions separated in the axial direction. These two regions are referred to as a winding end 218. These two winding end portions 218 extend in the circumferential direction, and the axial length is constant over the circumferential direction. Therefore, the two winding end portions 218 extend in parallel with each other. The circumferential length of the winding end 218 is substantially the same as that of the winding end 217. Between the two winding end portions 218, the winding end portion 217 extends in parallel therewith.

  The 1st protrusion part 211 is connected with the edge part 210a. That is, the first protrusion 211 is connected to the winding end 217. The first protrusion 211 extends in the radial direction of the winding part 210 and in a direction away from the outer peripheral surface of the electrode 4. A circular hole 211 a for fixing to the external power supply connection terminal 7 is formed in the first protrusion 211.

  The two second protrusions 212 are connected to the end 210b. The two second protrusions 212 are connected to the two winding end portions 218, respectively. The two second protrusions 212 extend in the radial direction of the winding part 210 and in the direction away from the outer peripheral surface of the electrode 4. The length (projection amount) of the second projecting portion 212 in the extending direction is shorter than the length of the first projecting portion 211 in the extending direction.

  The power supply terminal 205 is formed by the following procedure using a single metal plate. As shown in FIG. 8, the corners of both ends in the longitudinal direction (vertical direction in FIG. 8) of one flat rectangular metal plate material are cut off, and the first protrusion 211 and the winding end 217 are cut off. And a portion that becomes the second projecting portion 212 and the winding end portion 218 are formed. Further, a slit 210c is formed at a substantially central portion in the longitudinal direction. Next, the first projecting portion 211 and the second projecting portion 212 are formed by vertically bending in the same direction at two positions 210a and 210b indicated by broken lines in FIG. Then, the region between the two bent portions is wound around the core more than one turn and curved to form the winding portion 210.

  When attaching the power supply terminal 205 to the outer peripheral surface of the electrode 4, as in the case of the power supply terminal 5 of the first embodiment, a finger is put on the first protrusion 211 and the second protrusion 212 in FIG. A force is applied in the direction of the arrow to increase the diameter of the winding part 210. In this state, after inserting the end of the discharge tube 3 inside the winding part 210, the force applied to the projecting parts 211 and 212 is released, and the restoring force of the winding part 210 in the reduced diameter direction is released. The winding part 210 is brought into close contact with the outer peripheral surface of the electrode 4. In this way, the power supply terminal 205 can be easily attached to the outer peripheral surface of the electrode 4 by using the first protrusion 211 and the second protrusion 212. In addition, the power supply terminal 5 and the electrode 4 are electrically and stably connected to each other because the restoring force (spring force) in the diameter reducing direction of the winding portion 10 is securely adhered to the outer peripheral surface of the electrode 4.

  The first protrusion 11 of the first embodiment is connected to two winding ends 13 that are spaced apart in the axial direction, and has two legs 15. If the length of the leg portion 15 in the extending direction (the radial direction of the winding portion 10) is too short, that is, if the length of the space between the two leg portions 15 is too short, a single metal plate material is obtained. When the core member is wound and curved more than 1 turn, and when the diameter of the winding part 10 is increased during use as the power supply terminal 5, the outer peripheral surface of the winding end part 14 comes into contact with the connecting part 16. The portion 10 cannot be further expanded in diameter. Therefore, the extension direction length of the leg part 15 is required to some extent, and the total length of the first protrusion 11 is also increased. On the other hand, the first protrusion 211 of the present embodiment does not need to ensure the length of the leg 15 as described above. Therefore, the extending direction length of the 1st protrusion part 211 can be made shorter than the 1st protrusion part 11 of 1st Embodiment. Accordingly, the height of the external electrode discharge lamp 2 from the substrate 8 in the state where the external electrode discharge lamp 2 is installed on the substrate 8 by the power supply terminal 5 can be reduced, so that the light source device 1 can be downsized.

  In the power supply terminal 205 of the second embodiment, the two second protrusions 212 are provided. However, the two second protrusions 212 are extended in the extending direction and connected at the distal end portion. May be. Thereby, since the 2nd protrusion part 212 will be comprised by one member, when expanding the winding part 210, it is easy to put a finger on the 2nd protrusion part 212, and also the winding part 210 Can be expanded substantially uniformly in the axial direction.

It is a figure which shows the outline of the light source device of 1st Embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is a perspective view of the electric power feeding terminal for external electrode discharge lamps of 1st Embodiment. It is a top view of the metal board | plate material which comprises the electric power feeding terminal for external electrode discharge lamps. It is a perspective view which shows the use condition of the electric power feeding terminal for external electrode discharge lamps. It is a perspective view which shows the other example of the electric power feeding terminal for external electrode discharge lamps of 1st Embodiment. It is a perspective view of the electric power feeding terminal for external electrode discharge lamps of 2nd Embodiment. It is a top view of the metal board | plate material which comprises the electric power feeding terminal for external electrode discharge lamps of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source device 2 External electrode discharge lamp 3 Discharge tube 4 Electrode 5, 205 Feed terminal 10, 210 Winding part 10a, 210a End part (one end)
10b, 210b end (other end)
10c, 210c Slit 11, 211 First protrusion 12, 212 Second protrusion 15 Leg 16 Connection

Claims (5)

A power supply terminal for an external electrode discharge lamp made of one metal plate attached to the electrode of an external electrode discharge lamp having an electrode covering an outer peripheral surface of the discharge tube,
Winding in which more than one turn along the circumferential direction of the outer peripheral surface of the electrode is wound without overlapping in the radial direction , and one end vicinity and the other end vicinity in the circumferential direction are parallel in the axial direction Kaibu,
A first protrusion connected to the one end of the winding portion and extending in a direction away from the outer peripheral surface;
A power supply terminal for an external electrode discharge lamp, comprising: a second protrusion connected to the other end of the winding portion and extending in a direction away from the outer peripheral surface. The vicinity of the one end of the winding portion is divided into two parallel regions separated from each other in the axial direction, and the vicinity of the other end of the winding portion extends between the two regions in parallel therewith. Exist,
Said first protrusion, and two legs connected to the two regions, according to claim 1, characterized in that a connecting portion for connecting the two legs to one another Power supply terminal for external electrode discharge lamp. The vicinity of the other end of the winding portion is divided into two mutually parallel regions spaced apart in the axial direction, and the vicinity of the one end of the winding portion extends in parallel between the two regions. Exist,
2. The external electrode discharge lamp power supply terminal according to claim 1 , wherein two of the second protrusions connected to the two regions are provided. 3. Wherein the winding unit, the external electrode discharge lamp power supply terminal according to any one of claim 1 to 3, characterized in that the slits extending in the circumferential direction is formed. A light source device comprising: an external electrode discharge lamp having an electrode covering an outer peripheral surface of a discharge tube; and a power supply terminal for an external electrode discharge lamp made of one metal plate attached to the electrode,
The power supply terminal for the external electrode discharge lamp is
The electrode is wound more than one turn along the circumferential direction of the outer peripheral surface of the electrode without overlapping in the radial direction , and the vicinity of one end and the vicinity of the other end in the circumferential direction are parallel in the axial direction. Winding part,
A first protrusion connected to one end of the winding portion in the circumferential direction and extending in a direction away from the outer peripheral surface;
A light source device comprising: a second protrusion connected to the other end of the winding portion in the circumferential direction and extending in a direction away from the outer peripheral surface.

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