JPH0525168Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to an internal trigger type strobe discharge tube, and is particularly aimed at simplifying the structure and reducing costs.

``Prior art'' A strobe discharge tube is a discharge tube that momentarily emits a strong flash of light by passing a large current through an arc discharge, and is used as a light source for a stroboscope to observe rotating objects, vibrating objects, etc. at a certain phase. used for.
As shown in Figure 2, the internal trigger type strobe discharge tube has a main part sealed in a glass tube 1 with an inert gas such as xenon gas at about 1 to 2 atmospheres, and has a shape similar to a miniature vacuum tube. have. The glass tube 1 is often made of soda-lime glass, and includes a base disc-shaped stem 1a and a cylindrical outer tube 1b that integrally extends upward from the periphery of the stem 1a and has its end face closed. It consists of From the back of stem 1a, stem 1
iron, at approximately equal angular intervals along the circumference of the coaxial center with a
Pin 2 made of chrome etc. and approximately 1mm in diameter
₁ , 2 ₂ ... 2 ₉ are provided protrudingly. The spacing between pin 2 ₁ and pin 2 ₉ is approximately twice the pitch of the other pins.

From the top surface of the stem 1a in the glass tube 1,
An internal support 3 _i made of nickel or the like and having a diameter of approximately 0.5 mm extends in the direction of extension of each pin 2 _i (i = 1 to 9).
(i=1 to 9) are provided protrudingly. In this example, only the internal struts 3 ₂ and 3 ₅ are cut shorter than the others. One end surface of each of the cylindrical cathode 4 and anode 7 is welded to the tips of the internal struts 3 ₁ and 3 ₆ , which are located symmetrically with respect to the axis of the stem 1a, and their other end surfaces are welded to each other. They are arranged so that they face each other and come close to each other. Internal struts 3 ₃ , 3 ₄ , 3 ₇ ,
From near the tips of 3 ₈ and 3 ₉ , a wire-shaped trigger electrode 6 made of tungsten or the like and approximately 0.2 mm in diameter is inserted.
One end of each of ₃ , 6 ₄ , 6 ₇ , 6 ₈ , and 6 ₉ is welded approximately perpendicularly to each column. Each trigger electrode 6
The other end of _i is located near the straight line connecting the opposing surfaces of the cathode 4 and anode 5, and is spaced at approximately equal intervals from the cathode 4 side to the anode 5 side at 6 ₉ , 6 ₃ , 6 ₈ , 6 ₄ , 6 Arranged in the order of ₇ . An ion generator 7 is welded between the internal struts 3 ₂ and 3 ₁ . Around the base of the internal support 3 _i (i=1 to 9), a platform-shaped convex portion 8 is integrally provided to protrude from the stem 1a in order to hold the internal support.
The pin 2 _i and the internal support 3 _i are connected by electric welding with their end surfaces brought into contact near the lower surface of the stem 1a.

As shown in FIG. 3, a voltage of about 300 V, for example, is applied between the cathode 4 and the anode 5 from an external DC power supply 11, and one end of each trigger electrode 3 _i and the ion generator 7 and the cathode 4 is connected to the trigger pulse generator 1 via a capacitor C of about 4 pF.
2, a trigger pulse with a repetition frequency of approximately 300 Hz and a magnitude of 5000 to 6000 Vpp as shown in FIG. 4 is applied, for example.

As shown in FIG. 5, the ion generator 7 includes a tungsten wire 22 and a nickel ring 2 on the inner and outer peripheral surfaces of an alumina (ceramic) cylinder 21.
3 are fitted together, and a strip-shaped terminal 23a is extended from one end of the nickel ring 23,
The tungsten wire 22 is welded to the internal support 3 ₂ and the terminal 23a is welded to the vicinity of the protrusion 8 of the internal support 3 ₁ . A tungsten wire 22 is provided protruding from one end surface of the ion generator 7, and the other end surface is formed into a planar shape. Tungsten wire 2
When a trigger pulse is applied between the alumina cylinder 21 and the nickel ring 23, a creeping discharge occurs between the two at the other end face along the end face of the alumina cylinder 21, and ions are generated.

On the other hand, the trigger electrode 6 _i (i=3, 4, 7, 8,
The tip of the electrode 9) is arranged in the main discharge path between the anode 5 and the cathode 4, and when a high voltage pulse is applied to the trigger electrode _6i , the surrounding gas is ionized and the main discharge occurs. A conductive path is formed. The generation of ions by the ion generator 7 promotes the generation of ions by the trigger electrode 6 _i .
By forming a conductive path by the trigger electrode 6 _i ,
A main discharge (arc discharge) starts between the anodes 5 and 4.

Note that the number of trigger electrodes 6 _i is not limited to 5, but 2 to 6.
There are cases where there are three, but generally more than one is used.

``Problems that invention attempts to solve'' Although the performance of devices such as stroboscopes has been greatly improved in recent years, the increase in their costs has been kept low, and there is a strong demand for reducing the costs of their component parts. be done. Strobe discharge tubes are no exception. The purpose of this invention is to simplify the structure of a strobe discharge tube and reduce costs.

"Means for Solving the Problem" A cathode and an anode are mounted facing each other on corresponding internal supports planted in the stem of a glass tube, along a main discharge path connecting the cathode and anode. , and one end thereof is located near the path, a plurality of trigger electrodes are connected to corresponding ones of the internal struts planted on the stem, and a plurality of trigger electrodes are respectively connected to the internal struts from the bottom surface of the stem. In an internally triggered strobe discharge tube in which a pin protrudes to the outside and an inert gas is sealed in the glass tube, in this invention, the trigger electrode is integrated by bending and extending the upper end of the corresponding internal column. It is composed of

``Example'' An example of this invention is shown in FIG. 1, and parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and redundant explanation will be omitted.
In this invention, each trigger electrode 6 _i is integrally formed by bending and extending the upper end of the corresponding internal column 3 _i at a substantially right angle. Conventionally, the trigger electrode 6 _i
Since the tip of the wire is exposed to high-temperature discharge plasma, tungsten wire, for example, has been used as a metal that can withstand high temperatures and is difficult to evaporate. However, the inventor's research revealed that in a strobe discharge tube filled with xenon gas of about 1 to 2 atmospheres, the gas pressure momentarily becomes extremely high around the plasma during discharge, causing evaporation of the tip of the trigger electrode _6i . It has been revealed that there is extremely little wear and tear due to high temperatures, and that low melting point metals such as nickel, copper, and iron can be used as trigger electrode materials. Therefore, in this invention, the internal column 6 _i made of a material such as nickel with a low melting point is used as the trigger electrode to reduce costs, and the strobe discharge tube of this invention is no different from the conventional one. It has been confirmed that it works well.

"Effects of the Invention" According to this invention, instead of the conventional trigger electrode made of tungsten or the like, an inner column whose tip is bent and extended is used. Therefore, the number of parts is reduced accordingly, and the man-hours for welding wires such as tungsten to the internal struts are also eliminated, making it possible to achieve a significant cost reduction.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of this invention;
The figure is a perspective view of a conventional internal trigger type strobe discharge tube, Figure 3 is a wiring diagram showing the connection relationship between the pins of the strobe discharge tube in Figure 2 and an external power supply, and Figure 4 is a waveform diagram of the trigger pulse. Figures 5A and 5B are a front view of the ion generator 7 in Figure 2 and its A
-A sectional view.

Claims (1)

[Scope of Claim for Utility Model Registration] A cathode and an anode are installed facing each other on corresponding internal supports planted in the stem of a glass tube, along a main discharge path connecting the cathode and anode, and one end of which is located near the path, a plurality of trigger electrodes connected to corresponding ones of the internal struts planted on the stem, and a plurality of trigger electrodes connected to the internal struts from the lower surface of the stem, respectively. In an internally triggered strobe discharge tube in which a pin protrudes to the outside and an inert gas is sealed in the glass tube, the trigger electrode is integrally formed by bending and extending the upper end of the corresponding internal column. An internally triggered strobe discharge tube.