JPH0445264Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a holding structure for a laser capillary of an internal mirror laser tube.

[Conventional technology]

In the conventional internal mirror He-Ne laser tube, as shown in Fig. 3, a laser tube 3 whose one end is fixed to a vacuum envelope 2 is extended coaxially and is held by inserting a metal spacer 1 into the free end side. has been done. An anode pin 4 and a mirror 5 are sealed to the right end of the laser tube 3. The cathode 7 is connected to a cathode pin 9 by a lead wire 8. A metal spacer 1 is installed between the vacuum envelope 2 and the laser tube 3 to hold them coaxially and to prevent the laser tube 3 from being damaged by vibrations, impact forces, etc. However, the metal spacer 1 is not fixed to either the vacuum envelope 2 or the laser capillary tube 3, but is only in contact with both.

[Problems to be Solved by the Invention] The above-described conventional metal spacer for holding the laser tube maintains its position only by frictional force against the laser tube and the vacuum envelope. Therefore, if an excessive impact force that exceeds the frictional force of the metal spacer is applied in the axial direction of the laser tube, the position and attitude of the metal spacer will change and the laser tube, which is the original purpose, will be moved against the vacuum envelope. The function of holding is lost. As a result, the laser tube is bent, resulting in adverse effects such as a decrease in laser output.

Another disadvantage is that during assembly, the position of the metal spacer varies depending on the laser tube, which can cause variations in output stability.

[Means for solving problems]

The present invention is characterized by adopting a structure in which a metal spacer is fixed to a laser tube in order to solve the problems of the prior art.

In other words, a knob-like protrusion is formed in a part of the laser tube along the circumferential direction of the tube using the same glass material as the tube or a glass material having a coefficient of thermal expansion close to that of the tube. Next, two metal spacers for keeping the position of the laser thin tube unchanged in the vacuum envelope are inserted from the left and right sides of the laser thin tube, respectively, and they are joined to each other by spot welding or the like with the knob-shaped protrusion in between.
Therefore, the left and right metal spacers cannot move beyond the knob-like projections. As a result, the knob-like protrusion acts as a stopper for the metal spacer,
The metal spacer is firmly fixed to the laser capillary. Further, since the knob-like protrusion exists on the entire circumference of a certain part of the laser tube in the axial direction, the metal spacer does not change its attitude at that position.

〔Example〕

Next, the present invention will be explained using the drawings.

FIG. 1 is an enlarged cross-sectional view of a metal spacer mounting portion according to an embodiment of the present invention. A knob-shaped projection (stopper) 12 is formed over the entire circumference of a certain portion of the laser thin tube 3 using the same glass material as the laser thin tube. This knob-shaped protrusion 12 is sandwiched between metal spacers 10 and 11 from the left and right, and the metal spacers 10 and 11 are joined by spot welding. FIG. 2 is a perspective view showing an example of a metal spacer. It has a cross shape and its ends are bent so as to be in contact with the vacuum envelope 2. Further, a laser thin tube hole 13 is provided in the central portion. Note that the shape shown in FIG. 2 is an example, and the shape is not limited to this.

[Effect of idea]

As explained above using the drawings, the present invention involves sandwiching the octopus-shaped protrusion made on the laser tube between two metal spacers from both sides, and joining the two metal spacers to each other by spot welding or the like. ing. Therefore, the metal spacer is fixed to the laser tube, and the metal spacer will not move due to impact force in the axial direction of the laser tube. Moreover, since the position of the metal spacer is fixed by the knob-like protrusion during assembly, there is no variation in the position of the metal spacer as in the conventional case.

Therefore, the disadvantages of the prior art are eliminated, and there is an effect that reduction in output due to impact force, variation in output stability due to variation in the position of the metal spacer, etc. can be suppressed.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of a metal spacer attachment part according to an embodiment of the present invention, Fig. 2 is a perspective view of an example of a metal spacer, and Fig. 3 is a conventional internal mirror He-
FIG. 3 is a cross-sectional view of the Ne laser tube. 1... Metal spacer, 2... Vacuum envelope, 3
... Laser tube, 4 ... Anode pin, 5, 6 ...
...Mirror, 7...Cathode, 8...Leader line, 9
...Cathode pin, 10, 11...Metal spacer, 12...Knob-shaped projection.

Claims (1)

[Scope of utility model registration request] In an internal mirror laser tube in which a vacuum envelope and a laser capillary are arranged coaxially, a part of the laser capillary is provided with a knob-like protrusion along the circumferential direction of the capillary, and the laser capillary is connected to the vacuum envelope. 1. An internal mirror laser tube, characterized in that two metal spacers are attached to each other so as to sandwich the knob-shaped projection from the left and right sides.