JPS6199262A - Hydrogen discharge tube - Google Patents

Abstract

PURPOSE:To raise the brightness of a hydrogen discharge tube and lengthen its life by installing a power source that can supply electric power to an anode and a bulkhead plating, which is used as a cathode, under the situation in which continuous discharge is maintained. CONSTITUTION:Discharge is started by connecting an anode 1 and a cathode 2. Next, throught electric supply to a bulkhead plating 3 and the anode 2 by shifting a contact segment from contact point 12 to a contact point 13, discharge between them is set off. Thus by using the hot-cathode 1 only at the time of starting discharge and employing the bulkhead plating 3 as the cathode at a stationary state, it is possible to reduce oxide consumption of the cathode 1 and lengthen its life. Even if twice as much electric current is flowed to the bulkhead plating 3 and the anode 2 compared to the case with the hot- cathode 1, no breakdown occurs due to ion shock. Accordingly, brightness and life of the discharge tube can be increased though this arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hydrogen discharge tube, and more particularly to an improvement in a hydrogen discharge tube used as an ultraviolet light source for spectroscopic analysis.

[Background of the invention]

In recent years, spectroscopic analyzers have been required to have higher performance, and increasing the brightness and longevity of their light sources have become important issues.

In particular, there are many complaints of this kind for already delivered products, which is a limitation of the hot cathode method. In the discharge current division method of the pulsed light emitting method disclosed in JP-A-53-128173, a short life due to oxide consumption cannot be avoided. It is also difficult to achieve high brightness.

[Purpose of the invention]

The present invention aims to provide a hydrogen discharge tube suitable for a light source for spectroscopic analysis, which has the same shape as a conventional hot cathode type hydrogen discharge tube and is compatible with already delivered products, and has high brightness and a long life. purpose.

[Summary of the invention]

The characteristics of the present invention are that startup is performed using a hot cathode and an anode in the same way as in the past, and during normal operation, a conventional partition plate is used as a cold cathode, and after startup, the power circuit on the hot cathode side is cut off. This is different from the easy-to-light-up (start-up) method found in the light system A84 003, which has a significantly longer lifespan than conventional ones.
Moreover, high brightness can be achieved. This can be achieved using only the cold cathode under certain conditions, that is, by creating a configuration that effectively produces the hollow effect. .

[Embodiments of the invention]

FIG. 1 is a partially cutaway view showing the structure of a hydrogen discharge tube according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1. There is a coil-type hot cathode 1 and an anode 2, which are supported by a stem 8 and drawn out of the tube 7 by an introduction wire 9. The tube body 7 is a cylindrical glass tube, with a part of it protruding in a circular shape, and a glass plate at its tip that is well transparent to ultraviolet rays.
The mounting is perpendicular to 8 and is filled with deuterium.

Between the cathode and anode is a partition plate 3 having cathode discharge path holes 6 and discharge emission radiation density enhancement holes 4.

Conventionally, in a hydrogen discharge tube with the above configuration]
The cathode 1 is appropriately heated, and DC power is continuously applied between the cathode 1 and the anode 2 to cause continuous light emission, or it is applied intermittently to generate pulsed light such as a rectangular wave. In the hydrogen discharge tube of this embodiment, the partition plate 3 is used as the third electrode, and during normal operation, this is used as the only cathode to supply power.

[Embodiments of the invention]

FIG. 3 shows an electric circuit for making the hydrogen discharge tube of this embodiment constantly emit light. There are a cathode 1 and an anode 2 in the tubular body 7 of this embodiment. It is connected to the contact 14. -1
The partition plate 3 connected to the third electrode is connected to the contact 13 of the relay 15. First, as shown in FIG. 3, the cathode 1 and the anode 2 are connected to start a discharge. Next, attach the contact piece of contact 12 to contact 13.
The switch is switched to supply electric power between the partition plate 3 and the anode 2 to cause discharge. FIG. 4 is a diagram showing the relationship between the power supply status of the cathode 1 and the partition plate 3 of this embodiment, and the horizontal axis represents time. A curve 17 shows the power supplied between the cathode 1 and the anode 2, and a curve 16 shows the power supplied between the partition plate 3 and the anode 2.

The cathode 1 is a hot cathode coated with oxide.

During the discharge between the cathode 1 and the anode 2, the oxide is consumed by ion bombardment, which is the main reason for the short life. As mentioned above, the lifespan is long at the start of discharge. Further, even if a current twice as large as that in the case of the hot cathode 1 is passed through the partition plate 3 and the anode 2, the partition plate 3 and the anode 2 will not be damaged by ion bombardment, and accordingly, the emission intensity will also double. , and D sealed in the tube body 7 due to oxide consumption of the cathode 1.
Although the two gases are diluted (referred to as a clean amplifier phenomenon), in this embodiment, the operation is performed for a very short time, that is, only at the start of discharge, so that its consumption can be significantly reduced. Further, by arranging the inner walls of the cathode chamber 19 to face the cathodes at a certain distance, the discharge sustaining voltage can be reduced, and this is called the hollow effect. Therefore, in this embodiment, the inner wall of the hot cathode chamber 19 is made uneven to produce a hollow effect more effectively.

As an embodiment of the present invention, even if the electric power is supplied to the partition plate 3 and the anode 2 in a pulsed manner, the same effect as described above can be achieved, and even larger current discharge becomes possible, resulting in a remarkable increase in the luminous intensity.

〔Effect of the invention〕

As described above, the hydrogen discharge tube of the present invention has a long life and a comparable luminous intensity, has the same external shape as existing ones, is compatible with already delivered products, and requires a relatively simple power supply circuit. In addition, the emission intensity is further doubled, so the 3N ratio becomes dog, and Analysis 8
The degree will improve.

As described above, the hydrogen discharge tube of the present invention has the advantages of high light intensity and long life.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway structural diagram of a hydrogen discharge tube according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line AA' in Fig. 1, and Fig. 3 is a diagram showing the hydrogen discharge tube of this embodiment. Connection diagram of a working electrical circuit,
FIG. 4 is a diagram showing the relationship of power supply. 1... Hot cathode, 2... Anode, 3... Partition plate, 4...
...Radiation density enhancement hole, 5...Light extraction window, 6...
Cathode head, 7... tube body, 8... stem, -9...
Lead-in wire, 10... DC power supply, 11... Hot cathode supply power, 12-14... Contact, 15... Relay, 1
6,1.7...Power supply status, -τ

Claims (1)

[Claims] 1. Hydrogen or deuterium is sealed inside the tube, and it is provided with an anode, a hot cathode, and a partition plate, and electric power is supplied between the electrodes to discharge light and emit it to the outside of the tube. In the hydrogen discharge tube configured as shown in FIG. A hydrogen discharge tube characterized by being equipped with a power source that can switch the power supply. 2. The hydrogen discharge tube according to claim 1, wherein the partition plate has an uneven surface on the inner surface of the hot cathode chamber.