JPH0747890Y2 - Excitation lamp for laser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement in an excitation lamp for a laser, and in particular to an improvement in a lamp shape.

(Prior Art) FIG. 3 shows a typical structure of a conventional pump lamp for optically pumping a laser material. Quartz glass transparent tube 100
A rare gas such as xenon or krypton is enclosed in the box. Inside both ends of this tube 100 are a cathode 102 and an anode 104.
Are arranged so as to face each other, and one end of each of them is electrically coupled to the electrode terminals protruding from both ends of the tube 100 in an airtight manner.

(Problems to be solved by the invention) By the way, in the conventional excitation lamp as described above, the material of the electrodes 102 and 104 scatters due to long-term use to lower the discharge capacity, and the scattered matter adheres to the tube wall. Then, there is a problem that the emission brightness is reduced.

Generally, the electrode substrate is made of tungsten, and the cathode contains a small amount of an emission material such as barium in order to enhance electron emission output and prevent tungsten from scattering.
However, this emission material is consumed with time, and the tungsten of the electrode substrate is scattered, so that the brightness of the lamp is significantly reduced.

Further, in order to increase the brightness of the lamp, it is sufficient to increase the current supplied to the lamp, but since the consumption of the electrode also increases, the electrode diameter must be increased, and therefore the diameter of the transparent tube also becomes thicker. . When such a large-diameter excitation lamp has the same luminance, the light condensed by the elliptic mirror on the laser material is weaker than that of a small-diameter excitation lamp, and the irradiation efficiency of the laser material is deteriorated.

The present invention has been made in view of such problems,
It is an object of the present invention to provide an excitation lamp for a laser, which has low electrode consumption, high brightness, and a long life.

(Means for Solving the Problems) In order to achieve the above object, the laser excitation lamp of the present invention comprises a transparent tube (10) provided with discharge electrodes (12, 14) inside both ends, An excitation lamp for a laser comprising an electrode terminal (20, 22), one end of which is fixed to the electrodes (12, 14) and the other end of which is hermetically protruded from the transparent tube (10). The inner diameter of the intermediate part (10b) is set to the electrode (12,
14) smaller than the diameter of both electrodes (12, 14) front part (1
2a, 14a) and the intermediate portion (10b) of the transparent tube (10), a space (30) for accumulating scattered substances of the substrate of the electrode (12, 14) and smoothing the flow of electric force lines. , 32).

(Function) The lamp brightness is higher as the supplied current is higher and the current density in the transparent tube or the lamp tube is higher.

In the present invention, since the inner diameter of the middle portion of the lamp tube is made smaller than the diameter of the electrode, the lamp tube is close to the linear light source and the current density in the middle portion is high, resulting in high brightness. Further, since the diameter of the electrode is thicker than that of the lamp tube, the electrode wears out and the lamp life is extended.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the overall structure of an excitation lamp for a laser according to an embodiment of the present invention.

A rare gas such as xenon or krypton is sealed in a cylindrical discharge tube 10 made of quartz glass at a predetermined gas pressure according to the diameter of the tube 10. Inside both ends of this tube 10 the front part 12
A cylindrical cathode 12 and an anode 14 in which a and 14a are rounded are inserted so as to face each other. Cathode 12 is made of porous tungsten with a suitable emission material and anode 14 is made of pure tungsten. Both these electrodes 1
2, 14 are electrically coupled to the electrode terminals 20, 22 via cooling heat conductors 16, 18, respectively.

Now, in the present embodiment, the diameter of both electrodes 12, 14 is the tube middle portion 10b.
Is thicker than the inner diameter of the
The pipe portions 10a and 10c around the are thicker than the pipe middle portion 10b. The front portions 12a and 14a of both electrodes 12 and 14 and the tube middle portion
Spaces 30 and 32 are provided between the space 10 and 10b, respectively. These spaces 30 (32) serve as a reservoir for the scattered particles of the electrode substrate,
Further, as shown in FIG. 2, the size may be such as to make the flow of the lines of electric force 40 smooth.

Although the preferred embodiment has been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the technical idea thereof. For example, the shape of the front surface of the electrode is changed from a spherical shape to a shape that improves discharge efficiency.

(Effect of the Invention) As described above, according to the present invention, by making the inner diameter of the middle portion of the lamp tube smaller than the diameter of the electrode, the current density is increased, the emission brightness is increased, and the power consumption is reduced. Further, by providing a space in the front part of the electrode, scattered substances on the electrode base body can be collected, efficiency can be improved, and lamp life can be extended.

[Brief description of drawings]

FIG. 1 is a front view showing the entire structure of a laser excitation lamp according to an embodiment of the present invention, FIG. 2 is a partially enlarged view for explaining the operation of the above embodiment, and FIG. It is a front view which shows the typical structure of the conventional excitation lamp for lasers. 10 …… Discharge tube, 10b …… Tube middle part, 12 …… Cathode, 14 ……
Anode, 16,18 ... Heat conductor, 20,22 ... Electrode terminal.

Claims (1)

[Scope of utility model registration request] 1. A transparent tube (10) having discharge electrodes (12, 14) inside both ends, and one end fixed to the electrodes (12, 14) and the other end airtight from the transparent tube (10). In an excitation lamp for a laser, which comprises an electrode terminal (20, 22) which is protruded in the direction of the electrode (1
The diameter of the electrodes (12, 14) is smaller than the diameter of the electrodes (12, 14) between the front parts (12a, 14a) of both electrodes (12, 14) and the intermediate part (10b) of the transparent tube (10). An excitation lamp for a laser, characterized in that a space (30, 32) is provided for accumulating scattered substances on the substrate of (1) and for smoothing the flow of lines of electric force.