JP2015069886A - Discharge lamp and light irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the conductor of a lead wire hard to be removed from an electrode even if an external force is applied to the lead wire.SOLUTION: A discharge lamp includes: a discharge tube 2; a pair of electrodes 31, 32 provided in the discharge tube 2; bases 5 mechanically coupled to the discharge tube 2; and lead wires 41, 42 which have the lead wires 411, 421 and coating parts 412, 422 covering conductors 411, 421 and whose conductors 411, 421 are electrically connected to electrodes 31, 32. The lead wires 41, 42 are constituted so as to be mechanically connected to the bases 5.

Description

  The present invention relates to a discharge lamp such as a dielectric barrier discharge lamp and a light irradiation apparatus using the discharge lamp.

  For example, a dielectric barrier discharge lamp is provided with a pair of external electrodes on the outer surface of a discharge tube filled with a discharge gas, and lead wires are connected to the pair of external electrodes. As this lead wire, a wire in which a conductive wire is covered with a resin coating portion is used.

  Specifically, as shown in FIG. 4, the lead wire is connected to the electrode by soldering to the electrode, and is fixed to the outer surface of the discharge tube by using a protection block.

However, since the lead wire is directly soldered and connected to the electrode, there is a problem that when an external force is applied to the lead wire, the connecting portion between the lead wire and the electrode is broken and disconnected. is there. And the problem that this lead wire comes off is promoted by the deterioration of the covering portion of the lead wire as follows. That is, since the covering portion of the lead wire is deteriorated by the ultraviolet rays irradiated from the discharge tube, the pressing portion pressed by the protection block is deteriorated, and the pressing force by the protection block is lowered and is easily removed. In addition, since the lead wire and the discharge tube are in contact with each other, the coating portion is deteriorated and damaged by ultraviolet rays, and it is easy to come off. In addition, a configuration in which a light shielding film is provided in the vicinity of the lead wire on the inner surface of the discharge tube is also conceivable. It is enough.
In addition, a cylindrical cap is attached so as to surround the connection portion between the terminal and the harness, and there is one in which a thermosetting resin such as silicone resin is filled, such as this, Due to the deterioration of the thermosetting resin over time or due to UV radiation, the fixing force between the joint between the terminal and harness and the thermosetting resin will decrease. There is a problem that the connecting portion between the terminal and the harness breaks and comes off.

JP 2010-33883 A Japanese Patent No. 4174916

  Accordingly, the present invention has been made to solve the above-described problems, and its main intended problem is to make it difficult for the lead wires to be disconnected from the electrodes even when an external force is applied to the lead wires.

  That is, the discharge lamp according to the present invention includes a discharge tube, a pair of electrodes provided on the discharge tube, a base mechanically connected to the discharge tube, a conductive wire and a covering portion that covers the conductive wire. The lead wire includes a lead wire electrically connected to the electrode, and the lead wire is configured to be mechanically coupled to the base.

In such a discharge lamp, since the lead wire is mechanically connected to the base mechanically connected to the discharge tube, even when an external force is applied to the lead wire, the lead wire lead and electrode The connection portion is not easily affected by an external force, and the connection portion can be prevented from breaking. Also, the lead wire is mechanically connected to the base instead of the conventional structure in which the lead wire is sandwiched between the discharge tube and the protection block, so the base is tightly fixed to the discharge tube. Since it is not necessary, breakage of the discharge tube can be prevented.
Here, mechanically connected means not a fluid connection such as adhesive, resin, and soldering, but a connection using solid members (including elastic bodies) such as screws and rivets.

The lead wire is preferably configured to be electrically connected to the electrode through a connector member having an elastic restoring force.
If this is the case, the lead wire mechanically connected to the base is not directly connected to the electrode, so even if an external force is applied to the lead wire, the electrical connection between the lead wire and the electrode is cut off. There is no worry about it. Moreover, since the connector member provided with the elastic restoring force is used, the contact between the connector member and the electrode can be ensured.

The connector member is preferably configured to be mechanically coupled to the base. The lead wire and the connector member are preferably configured to be mechanically fastened and connected to the base.
If it is this, the electrical connection of the conducting wire of a lead wire and a connector member can be ensured, and the structure which connects mechanically the lead wire of a lead wire and a connector member to a base can be simplified.

It is desirable that the base is interposed between the covering portion of the lead wire and the outer surface of the discharge tube. In particular, the base is preferably composed of a light blocking member that blocks light generated in the discharge tube.
In this case, since the base is interposed between the covering portion of the lead wire and the outer surface of the discharge tube, it is possible to prevent the light emitted from the discharge tube from hitting the lead wire and causing light deterioration. In addition, heat from the discharge tube is hardly transmitted to the lead wire, and it is possible to prevent the lead wire from being thermally deteriorated.

The base is preferably configured to be mechanically connected to the discharge tube by a shaft inserted into a through hole or a recess provided in the discharge tube.
In this case, since the shaft cannot be removed simply by inserting the shaft into the through hole or the recess provided in the discharge tube, the structure of the discharge tube can be simplified.

  As a specific embodiment of the shaft, the shaft has a fastening element, and the base is connected to the discharge tube by fastening the fastening element. Conceivable.

The base has a first base and a second base provided so as to sandwich the discharge tube, and the first base and the second base are formed by the fastening element of the shaft. It is desirable that it is attached with a gap between the outer surface.
In this case, the first base and the second base are attached to the outer surface of the discharge tube with a gap by the fastening element. That is, since it is attached with a backlash, the discharge tube cannot be fastened to the base, so that the discharge tube can be prevented from being damaged.

A lead wire that is electrically connected to one of the pair of electrodes is mechanically coupled to the first base, and the second base is electrically connected to the other of the pair of electrodes. It is desirable that the lead wire connected to the device is configured to be mechanically coupled.
In this case, the lead wire can be drawn out from a part of the discharge tube, and the wiring can be easily routed. Moreover, since the lead wire is fixed to each base, electrical insulation can be ensured.

It is desirable that a crimp terminal that is mechanically fastened together with the connector member is provided at an end portion of the lead wire of the lead wire.
In this case, the electrical connection between the lead wire and the connector member can be further ensured, and the lead wire can be securely fixed to the base.

The connector member is preferably soldered to the electrode.
Even if the connector member is soldered to the electrode in this way, the connector member and the lead wire are fixed to the base, so even if an external force is applied to the lead wire, the connector member and the electrode There is no worry about breaking.

The base has an insertion hole into which the lead wire is inserted, and the lead wire is configured to be mechanically connected to the base in a state of being inserted into the insertion hole. desirable.
In this case, since the lead wire is inserted and fixed inside the base, the entire connecting portion of the lead wire is covered with the base, and the optical deterioration can be further prevented.

  The discharge lamp composed of the discharge tube and the pair of electrodes is preferably an ultraviolet lamp such as a dielectric barrier discharge lamp that irradiates ultraviolet rays.

  According to the present invention configured as described above, even if an external force is applied to the lead wire, the lead wire can be prevented from coming off the electrode.

The top view of the discharge lamp in this embodiment. The side view of the discharge lamp of the embodiment. The partial expanded sectional view of the connection part of the lead wire of the discharge lamp in the embodiment. Sectional drawing which shows the structure of the conventional dielectric barrier discharge lamp typically.

  Hereinafter, an embodiment of a discharge lamp according to the present invention will be described with reference to the drawings.

  A discharge lamp 100 according to the present embodiment is a dielectric barrier discharge lamp used in an ultraviolet irradiation device, and is provided in a straight tubular discharge tube 2 and the discharge tube 2 as shown in FIGS. A pair of electrodes 31, 32, and lead wires 41, 42 having conductors 411, 421 electrically connected to the pair of electrodes 31, 32 and covering portions 412, 422 covering the conductors 411, 421 are provided. ing.

  The discharge tube 2 is a sealed container in which a discharge space is formed inside by closing openings at both ends in the axial direction of a cylindrical body having a substantially rectangular cross section made of synthetic silica glass, for example, with a fused silica glass block. Xenon gas is enclosed as a working gas. The discharge tube 2 has an upper flat surface 2a and a lower flat surface 2b whose upper and lower outer surfaces are substantially flat. A first electrode 31 is formed on the upper flat surface 2a, and the lower flat surface 2b The second electrode 32 is formed. The first electrode 31 is a solid electrode, and the second electrode 32 is a mesh electrode. When a high frequency high voltage from a high frequency high voltage power source (not shown) is applied between the pair of electrodes 31 and 32, a dielectric barrier discharge is generated in the discharge space inside the discharge tube 2 made of a dielectric. Then, the xenon atom, which is a discharge gas, is excited, and when the xenon atom returns to the ground state, vacuum ultraviolet rays having a center wavelength of 172 nm are emitted (excimer emission). The vacuum ultraviolet rays are then emitted downward through the mesh of the second electrode 32 on the lower flat surface 2b of the discharge tube 2. That is, the lower flat surface 2b is an ultraviolet emission surface. Therefore, if the object to be irradiated is irradiated with the vacuum ultraviolet rays emitted below the discharge tube 2 through a slight gap, the object to be irradiated can be optically cleaned.

  The lead wires 41 and 42 for supplying power to the pair of electrodes 31 and 32 are mechanically connected to the base 5 as shown in FIGS. The base 5 of the present embodiment is composed of a light shielding member such as steatite that blocks light generated by the discharge tube 2.

  Specifically, the base 5 is mechanically connected to one end of the discharge tube 2 and cannot be removed. The base 5 is provided with a first base 51 and a second base 52 provided so as to sandwich the discharge tube 2. Have. Here, the first base 51 is for mechanically connecting and fixing the lead wire 41, and is for connecting the lead wire 41 to the first electrode 31. The second base 52 is for mechanically connecting and fixing the lead wire 42, and for connecting the lead wire 42 to the second electrode 32. With such a configuration, the lead wires 41 and 42 can be pulled out from one end portion of the discharge tube 2, and wiring can be easily routed. Moreover, since the lead wires 41 and 42 are fixed to the respective bases 51 and 52, electrical insulation can be ensured.

  The first base 51 and the second base 52 are mechanically connected to the discharge tube 2 by a shaft 6 inserted into a through hole 2h provided in the discharge tube 2 with the discharge tube 2 interposed therebetween. It is attached so that it cannot be removed. In addition, you may provide the recessed part with which the shaft 6 engages instead of the through-hole 2h in the discharge tube 2. FIG.

  As shown in FIG. 3, the shaft 6 is attached to the shaft main body 61 inserted into the through hole 2 h of the discharge tube 2 and the shaft main body 61, thereby discharging the first base 51 and the second base 52. And a fastening element 62 connected to the tube 2. Specifically, female screw portions are formed along the axial direction at both ends of the shaft main body 61, and the first base 51 and the first base 51 are formed by screwing screws 62, which are fastening elements, into the female screw portions of the shaft main body 61. Two bases 52 are connected. In the present embodiment, the first base 51 and the second base 52 are configured to be connected by the shaft 6 at two positions on both ends in the width direction of the discharge tube 2.

  At this time, there is a gap G between the side surface of the first base 51 and the second base 52 facing the discharge tube 2 side and the outer surface of the discharge tube 2 (specifically, the upper flat surface 2a and the lower flat surface 2b). Is formed. Specifically, the shaft main body 61 extends outward from the upper flat surface 2 a and the lower flat surface 2 b of the discharge tube 2, and the side surfaces of the first base 51 and the second base 52 are formed at both end surfaces of the shaft main body 61. By being abutted and tightened, the outer surface of the discharge tube 2 is configured not to be tightened. As a result, the first base 51 and the second base 52 are attached to the discharge tube 2 with a backlash.

  Further, in the first base 51 and the second base 52, the conductive wires 411 and 421 of the lead wires 41 and 42 are connected to the first external electrode 31 and the connector member 7 such as a contact fitting fixed to the bases 51 and 52. It is configured to be electrically connected to the second external electrode 32. Since the lead wires 41 and 42 fixed to the first base 51 and the second base 52 are not directly connected to the electrodes 31 and 32 as described above, even if an external force is applied to the lead wires 41 and 42, the lead wires There is no concern that the electrical connection between the conductive wires 411 and 421 of the terminals 41 and 42 and the electrodes 31 and 32 will be cut off.

  Specifically, the lead wires 411 and 421 of the lead wires 41 and 42 and the connector member 7 are fixed by being mechanically fastened to the first base 51 and the second base 52. Here, the crimp terminals 8 are connected to the leading ends of the conducting wires 411 and 421 of the lead wires 41 and 42, and the crimp terminals 8 are mechanically fastened together with the connector member 7 by screws 9. Further, the connector member 7 connected to the conducting wires 411 and 421 in this way is configured by, for example, a leaf spring having an elastic return force, and the electrode 31 is in a state where the elastic return force is applied to the electrodes 31 and 32. , 32 by soldering. Since the crimping terminal 8 and the connector member 7 provided on the conducting wires 411 and 421 of the lead wires 41 and 42 are mechanically fastened in this way, the conducting wires 411 and 421 of the lead wires 41 and 42 and the connector member 7 are The electrical connection can be ensured, and the structure of mechanically coupling the conductive wires 411 and 421 of the lead wires 41 and 42 and the connector member 7 to the base 5 can be simplified.

  Further, the bases 51 and 52 have insertion holes 51h and 52h into which the lead wires 41 and 42 are inserted, and the bases 51 and 52 are inserted with the lead wires 41 and 42 inserted into the insertion holes 51h and 52h. 52 is fixed. That is, the bases 51 and 52 are partly interposed between the outer surfaces (the upper flat surface 2 a and the lower flat surface 2 b) of the discharge tube 2 and the lead wires 41 and 42. This prevents the ultraviolet rays emitted from the discharge tube 2 from hitting the lead wires 41 and 42.

  According to the discharge lamp 100 according to the present embodiment configured as described above, the lead wires 41 and 42 are mechanically connected to the base 5 that is mechanically connected to the discharge tube 2 and cannot be removed. Therefore, even when an external force is applied to the lead wires 41 and 42, the connection portion between the lead wires 411 and 421 and the electrodes 31 and 32 of the lead wires 41 and 42 is hardly affected by the external force, and the connection portion is prevented from being broken. it can. In addition, the lead wires 41 and 42 are not sandwiched and fixed between the discharge tube 2 and the protection block as in the prior art, and the lead wires 41 and 42 are mechanically connected to the base 5. Since it is not necessary to tighten and fix to the discharge tube 2, the discharge tube 2 can be prevented from being damaged.

  Further, the base 5 (the first base 51 and the second base 52) is interposed between the covering portions 412 and 422 of the lead wires 41 and 42 and the outer surfaces (the upper flat surface 2a and the lower flat surface 2b) of the discharge tube 2. Therefore, it is possible to prevent the light emitted from the discharge tube 2 from hitting the lead wires 41 and 42 and being deteriorated. Further, the heat from the discharge tube 2 is hardly transmitted to the lead wire covering portions 412, 422, and it is possible to prevent the lead wires 41, 42 from being thermally deteriorated.

  Further, since the base 5 is mechanically connected to the discharge tube 2 by the shaft 6 inserted into the through-hole 2 h provided in the discharge tube 2 and cannot be removed, the base 5 is provided in the discharge tube 2. By simply inserting the shaft 6 into the through-hole 2h, it is impossible to remove it, and the structure of the discharge tube 2 and the mounting structure of the base 5 can be simplified.

  In addition, since the first base 51 and the second base 52 are attached to the outer surface of the discharge tube 2 by the fastening element 62 of the shaft 6 with a gap G, the first base 51 and the second base 52 are attached. Since the discharge tube 2 is attached with a backlash and the discharge tube 2 is not fastened to the base 5, damage to the discharge tube 2 can be prevented.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, each of the bases 51 and 52 has the insertion holes 51h and 52h into which the lead wires 41 and 42 are inserted, but the grooves in which the lead wires 41 and 42 are disposed are not the insertion holes. The structure which has may be sufficient.

  In the embodiment, the two lead wires 41 and 42 are fixed at one end portion of the discharge tube 2 in the tube axis direction, but one lead wire is connected to one end portion of the discharge tube 2 in the tube axis direction. 41 may be fixed, and the other lead wire 42 may be fixed to the other end. In this case, the base 5 is provided at each of both ends of the discharge tube 2 in the tube axis direction.

  Furthermore, in the said embodiment, although the shaft 6 has the fastening element 62, you may comprise so that the 1st base 51 and the 2nd base 52 may be connected with the discharge tube 2 by a rivet. In addition, any structure that is mechanically connected and cannot be removed may be used. In addition, by providing a convex portion on one of the base 5 or the discharge tube 2 and providing the other concave portion, the convex portion and the concave portion It is good also as a structure which cannot be removed by engaging.

  In addition, in the above-described embodiment, the case where the present invention is applied to a dielectric barrier discharge lamp that irradiates ultraviolet rays has been described, but the present invention can also be applied to other discharge lamps.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

100: Dielectric barrier discharge lamp (discharge lamp)
2 ... discharge tubes 2a, 2b ... outer surface 2h of discharge tube ... through holes 31, 32 ... pair of electrodes 411, 421 ... conductive wires 412, 422 ... covering 5 ... Base (shading member)
51 ... 1st base 51h ... Insertion hole 52 ... 2nd base 52h ... Lead wire 6 ... Shaft 61 ... Shaft body 62 ... Fastening element 7 ... Connector member ( Contact bracket)
8 ... Crimp terminal

Claims (15)

A discharge tube;
A pair of electrodes provided in the discharge tube;
A base mechanically coupled to the discharge tube;
A conductive wire and a covering portion covering the conductive wire, the conductive wire comprising a lead wire electrically connected to the electrode;
The discharge lamp is configured to be mechanically connected to the base.   The discharge lamp according to claim 1, wherein the lead wire is configured to be electrically connected to the electrode through a connector member having an elastic restoring force.   The discharge lamp according to claim 2, wherein the connector member is configured to be mechanically coupled to the base.   The discharge lamp according to claim 2, wherein the lead wire and the connector member are configured to be mechanically fastened and connected to the base.   The discharge lamp according to any one of claims 1 to 4, wherein the base is interposed between the covering portion of the lead wire and an outer surface of the discharge tube.   The discharge lamp according to any one of claims 1 to 5, wherein the base includes a light blocking member that blocks light generated in the discharge tube.   The said base is comprised so that it may be mechanically connected with the said discharge tube by the shaft inserted in the through-hole or recessed part provided in the said discharge tube. Discharge lamp.   The discharge lamp according to claim 1, wherein the shaft includes a fastening element, and the base is connected to the discharge tube by fastening the fastening element. The base has a first base and a second base provided so as to sandwich the discharge tube;
The discharge lamp according to claim 8, wherein the first base and the second base are attached to the outer surface of the discharge tube with a gap by the fastening element of the shaft. A lead wire electrically connected to one of the pair of electrodes is mechanically coupled to the first base,
The discharge lamp according to claim 9, wherein a lead wire electrically connected to the other of the pair of electrodes is mechanically coupled to the second base.   The discharge lamp according to any one of claims 2 to 10, wherein a crimp terminal that is mechanically fastened together with the connector member is provided at an end portion of the lead wire of the lead wire.   The discharge lamp according to any one of claims 2 to 11, wherein the connector member is soldered to the electrode. The base has an insertion hole into which the lead wire is inserted,
The discharge lamp according to any one of claims 1 to 12, wherein the lead wire is configured to be mechanically connected to the base in a state of being inserted into the insertion hole.   The discharge lamp according to any one of claims 1 to 13, wherein the discharge lamp including the discharge tube and the pair of electrodes is a dielectric barrier discharge lamp.   The light irradiation apparatus using the discharge lamp as described in any one of Claims 1 thru | or 14.