JP2733237B2 - Irradiation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an irradiating device using a flash discharge tube used for a copying machine, photographing and the like.

2. Description of the Related Art In general, a flash discharge tube stores a charge in a capacitor, and applies a high-frequency trigger voltage to a trigger electrode attached to the outer surface of the glass tube so that an anode and a cathode provided at both ends of the glass tube are provided. And discharges the charged electric charge instantaneously to generate a flash. When the charge of the capacitor is consumed by the flash discharge, the capacitor is charged next. The flash tube can obtain a flash repeatedly in synchronization with the cycle of application of the trigger voltage to the trigger electrode.

Generally, the trigger electrode is connected to a metal band fixed to the outer surface of the glass tube near the anode and the cathode. When a high-frequency trigger voltage is applied to the trigger electrode, light emission occurs between the metal band and the anode and the cathode and along the trigger electrode. A plasma discharge occurs in the space, and a rare gas, for example, xenon, sealed in the glass tube is excited, causing a flash between the anode and the cathode to discharge the charged charges instantaneously.

First, a general flash discharge tube will be further described with reference to FIG. An anode 2 and a cathode 3 are provided at both ends of a glass tube 1 made of quartz glass or the like, and a rare gas such as xenon is sealed therein. Metal bands 4, 5 are fixed to the outer surface of the glass tube 1 near the anode 2 and the cathode 3, and both ends of the trigger electrode 6 are spot-welded to these metal bands, and this trigger electrode is attached to the outer surface of the glass tube 1. Have been. In addition, 7 is a lead wire for a trigger electrode, 8 is a lead wire for an anode, and 9 is a lead wire for a cathode.

In such an irradiation device using a flash discharge tube, a plurality of flash discharge tubes are often arranged in parallel and electrically connected in series in order to obtain a compact and large output light amount.

Next, a conventional irradiation device in which two such flash discharge tubes are arranged in parallel and electrically connected in series will be described with reference to FIG. The two flash discharge tubes 10, 11 have the structure shown in FIG. 3, and the anode 2 of the flash discharge tube 10 and the cathode 12 of the flash discharge tube 11 are connected by a connection line 13, and the flash discharge tube Tube 10
The cathode 3 has a cathode lead wire 9 and an anode 14 of a flash discharge tube 11.
Are connected to the anode lead wires 8 respectively. Further, the metal band 5 fixed to the outer surface of the flash discharge tube 10 and the metal band 15 fixed to the flash discharge tube 11 are formed by a metal wire.
At 16, a lead wire 7 for a trigger electrode is connected to the metal band 5. The two flash discharge tubes 10 and 11 are held by holders 17 and 18. Reference numeral 19 denotes a trigger voltage generator. When a charge is stored in a capacitor (not shown) and a trigger voltage is applied by a trigger voltage generator 19, the trigger voltage is transmitted to the flash discharge tube 10 from the metal band 5, and the flash discharge tube 11 A trigger voltage is transmitted from the metal band 15 through the metal wire 16. Then, the flash discharge tubes 10 and 11 instantaneously discharge the charged charges instantaneously to generate a flash. The conventional irradiation device having such a structure has been assembled in the following procedure. That is, as shown in FIG. 3, the metal bands 4, 5 and the trigger electrode 6 were assembled to produce two flash discharge tubes attached to the glass tube 1, and then, as shown in FIG. After the two flash tubes are arranged side by side and attached to the holders 17, 18, the metal band 5 of the flash tube 10 and the flash tube 11
Spot weld the both ends of the metal wire 16 to the metal band 15 of
After the two flash discharge tubes 10 and 11 are integrated by the holders 17 and 18, the lead wire 7 for the trigger electrode, the lead wire 8 for the anode, the lead wire 9 for the cathode, and the connecting wire 13 Was connected to a predetermined location.

Problems to be Solved by the Invention The conventional irradiation device having such a structure has the following problems. That is, in order to obtain a compact irradiation device by arranging a plurality of flash discharge tubes 10 and 11 in parallel, the flash discharge tubes 10 and 11 need to have a structure as close as possible to each other. That is, for example, the outer surfaces of the glass tubes of the flash discharge tubes 10 and 11 are brought into close contact, or the gap between the two is
When the outer surface of the glass tube is approached such that the gap between the outer surfaces of the glass tubes of the flash tubes 10 and 11 is small in the irradiation device having the conventional structure, the flash tubes 1 are attached to the holders 17 and 18.
After attaching 0,11, attach the metal wire 16 to the metal band 5,15.
Spot welding work was difficult. In addition, dust generated during spot welding adheres to the outer surface of the glass tube, causing a crack in the glass tube. Also, after the metal wires 16 are spot-welded to the metal bands 5 and 15 first, and the flash tubes 10 and 11 are attached to the holders 17 and 18, a force such as tension is applied to the metal bands 5 and 15 and the metal bands 5 and 15 are applied. , 15 became loose and the fixing was incomplete, and the starting characteristics became unstable.

Means for Solving the Problems The irradiation apparatus of the present invention is provided with an anode and a cathode at both ends of a glass tube, and both ends of a trigger electrode are attached to a metal band fixed to the outer surface of the glass tube near the anode and near the cathode. A plurality of flash discharge tubes attached to the outer surface of the glass tube are arranged in parallel, and electrically connected in series, and a plurality of the metal bands located on the same side are connected on a metal plate. And a pair of trigger electrode supports fixedly connected to the pair.

Function The trigger electrode support has a role as a trigger electrode of a plurality of flash discharge tubes and a role of integrally supporting these flash discharge tubes. Metal wire is not required. For this reason, the gap on the outer surface of the glass tube of the plurality of flash discharge tubes can be reduced, and the flash discharge tubes can be arranged very closely and in parallel.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an irradiation apparatus according to the present invention in which two flash discharge tubes are arranged in parallel and electrically connected in series. In FIG. 1, an anode 2 provided at both ends of a flash discharge tube 10 and a cathode 12 of a flash discharge tube 11 are connected by a connection line 13, and a cathode lead wire 9 is connected to a cathode 3 of the flash discharge tube 10, and a flash discharge. Tube 11
The anode lead wires 8 are connected to the respective anodes 14. Further, a pair of trigger electrode supports 20, 21 having means for integrally supporting both flash discharge tubes is fixed to the outer surface of the glass tube near both electrodes of the flash discharge tubes 10, 11, and the pair of trigger electrode supports is fixed to both trigger electrode supports. Is the trigger electrode in close contact with the outer surface of each flash tube.
6 and 22 are spot-welded, and the trigger electrode lead wire 7 is spot-welded to one trigger electrode support 21.
Further, the flash discharge tubes 10, 11 integrally supported by the trigger electrode supports 20, 21 are held at both ends by ceramic holders 17, 18, respectively. Reference numeral 19 denotes a trigger voltage generator.

2A and 2B are perspective views of a trigger electrode support. Second
In FIG. A, metal bands 24 and 25 located on the same side on a metal plate 23 are fixed by spot welding. The metal bands 24 and 25 are formed to have dimensions substantially coincident with the outer diameters of the glass tubes of the flash discharge tubes 10 and 11, are welded on the same axis a of the metal plate 23, and have ears 26 and 27, respectively. The irradiation device provided with the trigger electrode support having such a structure is assembled in the following procedure. That is, as shown in FIG. 1, the trigger electrode support having the structure shown in FIG. 2A is located on the outer surface of the glass tube near both electrodes of the flash discharge tubes 10 and 11, and
By caulking 26 and 27 and fixing them to the outer surfaces of the glass tubes of the flash discharge tubes 10 and 11, the two flash discharge tubes are arranged in parallel and integrally supported.
Subsequently, the trigger electrodes 6, 22 are spot-welded to the ears 26, 27, and the lead wire 7 for the trigger electrode is connected.
3. Connect the anode lead wire 8 and the cathode lead wire 9 to predetermined locations. Thereafter, the flash discharge tubes 10, 11 are held by the holder 17,
Hold together at 18.

In FIG. 2A, when a trigger electrode support 20 in which metal bands 24 and 25 are welded on the same axis a of a metal plate 23 is used,
Due to the influence of the thickness of the metal bands 24 and 25, the glass tube outer surfaces of the flash discharge tubes cannot be closely arranged in parallel. The trigger electrode support shown in FIG.
Metal bands 24 and 25 located on the same side are welded on c and d. In this case, the outer surface of the glass tube of the flash tube is in close contact and parallel without being affected by the thickness of the metal bands 24 and 25. Can be arranged. Whether the outer surface of the glass tube of the flash discharge tube is closely adhered or the gap is provided is determined at the stage of designing the irradiation device, and an appropriate trigger electrode support can be selected.

 Next, specific examples of the present invention will be described.

The glass tube is an ozone-free quartz tube with an outside diameter of 13 mm, the emission length of one flash discharge tube is 47 mm, the metal plate used for the trigger electrode support is a 0.3 mm thick sunless plate, and the metal band is 0.3 mm thick Manganese-nickel alloy, trigger electrode is diameter
0.4mm nickel 60%, chromium 12%, iron 26% alloy wire, holding body made of 8mm thick zircon cordierite,
Two flash discharge tubes were arranged in parallel and electrically connected in series. Flashing at 150 J per flash with a trigger voltage of about 13 to 17 kV did not cause any loosening of the trigger electrode or cracks in the glass tube, and no optical or other problems even with more than 4 million flashes.

The use of a press-formed product as the trigger electrode support in the present invention can further enhance workability and its effects. Further, in the above-described embodiment, the irradiation apparatus using two flash discharge tubes has been described. However, needless to say, three or more flash discharge tubes can be used as necessary.

As described above, according to the present invention, a pair of trigger electrode supports having a plurality of metal bands fixed on a metal plate are mounted on the outer surface of a glass tube near both electrodes of a plurality of flash discharge tubes. Thus, the two flash discharge tubes can be integrally supported very close to each other. In addition, since the components can be fixed by spot welding or the like before attaching the flash discharge tube to the holder, welding work is facilitated, dust does not occur at the time of welding, and cracks in the glass tube are caused. Nothing to do. Further, since no force such as tension is applied to the trigger electrode support, the trigger electrode support does not become loose, and stable starting characteristics can be obtained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a front view of an irradiation apparatus according to one embodiment of the present invention, FIGS. 2A and 2B are perspective views showing examples of a trigger electrode support used in the irradiation apparatus of the present invention, and FIG. FIG. 4 is a front view of a general flash discharge tube, and FIG. 4 is a front view of a conventional irradiation device. 2,14… Anode, 3,12… Cathode, 6,22 …… Trigger electrode, 1
0,11: Flash discharge tube, 17, 18, Holder, 20, 21, Trigger electrode support, 24, 25 Metal band.

Claims (4)

(57) [Claims] An anode and a cathode are provided at both ends of a glass tube, and both ends of a trigger electrode are connected to a metal band fixed to an outer surface of the glass tube near the anode and the cathode, and the trigger electrode is connected to the glass tube. A pair of triggers in which a plurality of flash discharge tubes attached to the outer surface of the tube are arranged in parallel and electrically connected in series, and the plurality of metal bands located on the same side are fixedly connected to a metal plate and connected. An irradiation device comprising an electrode support. 2. An irradiation apparatus according to claim 1, wherein a plurality of metal bands located on the same side are fixed on the metal plate with the same axis. 3. The irradiation apparatus according to claim 1, wherein a plurality of metal bands located on the same side are fixed to the metal plate so as to be different from each other. 4. The irradiation apparatus according to claim 1, wherein a pair of holding members are provided on outer surfaces of both ends of the plurality of flash discharge tubes to hold the flash discharge tubes.