JPH01194262A - Flashing discharge tube - Google Patents

Abstract

PURPOSE:To prevent movement of a metal band connected with a trigger electrode by making the trigger electrode in such a construction that a glass tubing is wound round and bound fast with the chip surrounded. CONSTITUTION:Metal rings 4, 5 are fixed to the neighborhoods of the two electrodes at the outer surface of a glass tubing 1. A trigger electrode 6 surrounds the chip 8 and winds round the glass tubing to be bound fast, and the two ends of the trigger electrode 6 are electrically connected to the metal rings 4, 5 A lead for trigger electrode is connected with the metal ring 5. This prevents movement of metal band in connection with the trigger electrode and loosening thereof, wherein no special member is required additionally.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flash discharge tube used in copying machines, photography, and the like.

Conventional technology 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, thereby creating a connection between an anode and a cathode provided at both ends of the glass tube. It instantly discharges the charged charge and generates a flash of light. When the charge in the capacitor is consumed by the flash discharge, the capacitor is charged again. A flash discharge tube can repeatedly produce flashes in synchronization with the period of application of a trigger voltage to a trigger electrode.

When a high-frequency trigger voltage is applied to the trigger electrode, a plasma discharge occurs between the metal band and the anode and cathode, and in the light-emitting space along the trigger ring and pole, and a rare gas such as xenon sealed in the glass tube is excited. This causes a discharge to occur between the anode and cathode, instantly discharging the charged charge.

First, to explain a conventional flash discharge tube using FIG. 3, an anode 2 is attached to both ends of a glass tube 1 such as a quartz glass tube.
and a cathode 3, the interior of which is filled with a rare gas such as xenon. Metal rings 4 and 5 are fixed on the outer surface of the glass tube 1 near the picture electrode. A trigger electrode 6 is attached to the outer surface of the glass tube 1. In FIG. 3, numeral 7 indicates a lead wire for the trigger electrode, and numeral 8 indicates a tip portion for evacuation and filling of rare gas in the glass tube.゛Problem to be Solved by the Invention When a flash discharge tube with such a conventional structure is used for continuous flashing, at room temperature, the metal ring 4.5 fixed near both electrodes on the outer surface of the glass tube 1 undergoes thermal expansion. As a result, it moves as shown by the chain line and is separated from the anode 2 and cathode 3.

Such movement of the metal rings 4 and 5 makes it difficult for the trigger voltage to cause discharge between the metal band, anode, and cathode, and weakens the excitation of xenon, leading to an increase in the starting voltage between the anode and cathode, which causes a flash. The discharge tube sometimes did not start.

In order to eliminate this problem, it has been proposed to fix the metal band to the glass tube with adhesive, but the disadvantage is that the adhesive strength decreases due to the rise in temperature of the flash discharge tube, making it impossible to completely achieve the intended purpose. was there. There has also been a proposal to form protrusions on the glass tube to prevent movement of the metal band, but there was a risk that the flash discharge tube would be damaged during continuous flashing due to the distortion of the glass that occurs when forming the protrusions.

Means for Solving the Problems The present invention has been made to eliminate such conventional drawbacks, and includes a glass tube having a tip portion in the light emitting space and an anode and a cathode at both ends; A flash discharge tube having a metal band fixed to the outer surface of the glass tube near the anode and the cathode, a trigger electrode made of a metal wire connected to the metal band, and a lead wire for the trigger electrode connected to the trigger electrode. , the trigger electrode is configured to surround the tip portion and wrap and bundle the glass tube.

Effect The present invention has a structure in which a trigger electrode made of a metal wire is wound and bundled around the tip of the glass tube, so that movement of the metal band connected to the trigger electrode is prevented. Can be done.

Embodiment FIG. 1 shows a flash discharge tube according to an embodiment of the present invention, in which a glass tube 1 made of a quartz tube or the like is provided with a tip portion in the light emitting space, and an anode 2 and a cathode 3 are provided at both ends. is provided, and xenon is sealed inside. Metal rings 4 and 5 are fixed on the outer surface of the glass tube 1 near both electrodes. The trigger electrode 6 surrounds the tip portion 8 and the glass tube is wound and bound, and both ends of the trigger electrode 6 are electrically connected to the metal rings 4 and 5. The tied part is indicated by number 9. A trigger electrode lead wire 7 is connected to the metal ring 5.

2A, B, and C are a plan view, a front view, and a bottom view showing a state in which the tip part 8 is surrounded by a part of the trigger electrode 6.

Next, a specific example of the present invention will be explained.

With the structure shown in Figure 1, the glass tube is an ozone-free quartz tube with an outer diameter of 13 mm, the emission length is 1601 mm, and the trigger electrode has a diameter of 0 mm.
．． A 4 m alloy wire of 60% nickel, 12% chromium, and 26% iron was used, and the metal band was a nickel alloy with a thickness of 0.2 m and a width of 2 mm. A trigger voltage of 13 to 17 kV is applied to a flash discharge tube with such a structure, and 50 kV per flash is applied.
When I flashed it at 0J, there was no movement of the metal band or loosening of the trigger electrode (no rise in starting voltage) even after more than 3 million flashes.

On the other hand, in the flash discharge tube with the conventional structure shown in Fig. 3, when tested under the same conditions, the metal band moved after 100,000 flashes, and the metal band, anode, and cathode moved after 400,000 flashes. The distance from the tip was more than 10 m5, and the trigger electrode became loose, resulting in an increase in starting voltage. After 1 million flashes, it stopped starting.

As described in detail, the present invention has a structure in which a trigger electrode made of a metal wire is wound around the tip of the glass tube and bundled, so no special members are required. This prevents the metal band connected to the trigger electrode from moving or loosening the trigger electrode, thereby preventing starting difficulties.Provides an extremely reliable flash discharge tube. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a front view of a flash discharge tube which is an embodiment of the present invention;
FIGS. 2A, B, and C are enlarged plan views of the same essential parts. The front view, the bottom view, and FIG. 3 are front views of a conventional flash discharge tube. 1...Glass tube, 2...Anode, 3...
...Cathode, 4.5...Metal band, 6...
...Trigger electrode, 7...Trigger lead wire,
8... Chip part, 9... Bundled part.

Claims (1)

[Claims] A glass tube having a chip portion in a light emitting space and an anode and a cathode at both ends, a metal band fixed to the outer surface of the glass tube near the anode and the cathode, and a metal wire connected to the metal band. and a lead wire for the trigger electrode connected to the trigger electrode, the trigger electrode surrounding the tip portion and wrapping the glass tube and bundling it. A flash discharge tube characterized by: