WO2015192268A1

WO2015192268A1 - Carbon dioxide gas laser tube and preparation method therefor

Info

Publication number: WO2015192268A1
Application number: PCT/CN2014/000601
Authority: WO
Inventors: 徐海军
Original assignee: 徐海军
Priority date: 2014-06-18
Filing date: 2014-06-18
Publication date: 2015-12-23
Also published as: CN105684242A

Abstract

A carbon dioxide gas laser tube and a preparation method therefor. The carbon dioxide gas laser tube comprises laser lenses (1, 11) and a glass tube (20), characterised in that the laser lenses (1, 11) are fixedly sealed and connected to ports of the glass tube via metal rings matching the port expansion coefficient of the glass tube (20), the metal rings being arranged between the laser lenses and the ports of the glass tube. A metal ring comprises a Kovar portion (14), a lens seat portion (12) and a thin sheet portion (32), said portions being fixedly sealed and connected. The Kovar portions (14) are sealed and sintered to the ports of the glass tube (20), the laser lenses (1, 11) are adhered to the thin sheet portions (32), and the thin sheet portions (32) are annular metal thin sheet structures.

Description

Carbon dioxide gas laser tube and preparation method thereof

The present invention relates to the field of laser tube technology, and in particular to a carbon dioxide gas laser tube and a method of preparing the same. Background technique

Among the prior art carbon dioxide gas laser tubes, one is a laser tube that does not have a lens, and the other is a laser tube that has an adjustable lens angle.

Fig. 1 is a schematic view showing the structure of a prior art non-adjustable lens laser tube. As shown in Fig. 1, the laser tube is formed by firstly grinding the end faces 51, 54 of the glass tube with a fine sand into a plane and making the plane perpendicular to the discharge tube, and then respectively, the laser lenses 50, 55. Directly bonded to the end faces 51, 54 at both ends of the glass tube. During the use of such a laser tube, current is introduced into the laser tube from the tungsten needles 52, 53. The advantages of this type of laser tube are: The connection of the laser lens is stable. The disadvantages of this type of laser tube are: the tungsten needle is additionally welded to introduce current from the tungsten needle, and the very thin and hard tungsten needle is not easy to connect the wire; in addition, the lens is directly bonded to the glass nozzle because the glass is thermally conductive, Not conducive to lens distraction,

Patent CN 203150891 U discloses a carbon dioxide laser tube conditioning head for connecting a laser lens to a glass tube to form a laser tube with an adjustable lens angle. The advantage of using the adjustable structure of the adjustment head to connect the laser lens to the glass tube is that the nozzle is not required to be ground, and the angle of the lens is adjusted by adjusting the screw; without the need to weld the tungsten needle, the current can be introduced through the metal structure of the adjustment head. Inside the laser tube. However, the disadvantage of using such an adjustment head to connect the laser lens to the glass tube is that the adjustment head changes the angle of the laser lens by adjusting the screw and connects the laser lens to the glass tube, however, the adjustment screw is at different temperatures and In the case of vibration, it is loose, so that the connection of the laser lens is unstable, resulting in deterioration of the laser mode of the laser tube and a decrease in laser power. Summary of the invention

In view of this, it is an object of the present invention to provide a carbon dioxide gas laser tube which can ensure the stability of the connection of the laser lens without the need to weld a tungsten needle.

According to an aspect of the present invention, a carbon dioxide gas laser tube is provided, comprising a laser lens and a glass tube, wherein the laser lens is fixedly connected to the glass by a metal ring that is matched with a port of the glass tube. a port of the tube, the metal ring being disposed between the laser lens and a port of the glass tube, wherein the metal ring comprises a sheet portion, a mirror portion, and a gradable portion.

Preferably, the sheet portion of the metal ring is made of a metal or alloy having a Brinell hardness of 55 or less.

Preferably, the sheet portion of the metal ring is made of copper.

Preferably, the sheet portion of the metal ring of the metal ring is brazed to the seat end surface of the lens holder portion. Preferably, the craterable portion of the metal ring is made of a metal or alloy having a coefficient of expansion that matches the glass orifice.

Preferably, the craterable portion of the metal ring is made of a Kovar alloy whose expansion coefficient is matched with a glass nozzle.

Preferably, the lens holder portion of the metal ring is made of stainless steel.

Preferably, the mirror portion of the metal ring is made of an alloy of iron, nickel, titanium or the like. Preferably, the mirror seat portion and the cut portion of the metal ring are made of the same metal. Preferably, the metal ring is provided with a metal post or hole for connecting an external wire. Preferably, the carbon dioxide gas laser tube comprises a laser lens and a glass tube, and the method comprises:

Cutting a vane portion matching the port expansion coefficient of the glass tube to a port of the glass tube; brazing the sheet portion to a seat end portion of the lens holder portion; The surface of the sheet portion of the laser lens is subjected to milling and polishing so that the polishing surface of the metal ring is perpendicular to the central axis of the discharge tube; and the laser lens is bonded to the milling surface of the sheet portion and the polished surface. Wherein the sheet portion, the mirror portion, and the cut portion are between the lens and the port of the glass tube.

Beneficial effect In the carbon dioxide gas laser tube of the present invention, the laser lens is fixedly connected to the port of the glass tube by a metal ring that is matched with the port of the glass tube, since the adjustment screw is not used like a laser tube with a adjustable lens angle In order to connect the laser lens to the glass tube, the connection of the laser lens is ensured, and the tungsten needle is not welded, and current can be introduced into the laser tube through the metal ring.

Further, in the carbon dioxide gas laser of the present invention, the metal ring includes a sheet portion, a mirror portion, and a cut portion.

The lens holder portion and the kovar portion are integrally welded, the crater portion is sealed and sintered with the port of the glass tube, the sheet portion is brazed to the lens holder portion, and the sheet portion is adhesively sealed and connected to the laser lens. The metal is relatively soft and has good thermal conductivity. For example, it can be made of metal or alloy with a Brinell hardness of 55 or less. The material of the sheet is copper. The copper is soft and easy to process. The copper conducts heat better, which helps the laser lens. Cooling. DRAWINGS

Fig. 1 is a schematic view showing the structure of a prior art non-adjustable lens laser tube. Fig. 2 is a view showing the structure of a carbon dioxide gas laser tube according to an embodiment of the present invention.

Fig. 3 is an enlarged view showing the trailing end of the carbon dioxide gas laser tube shown in Fig. 2. Fig. 4 is an enlarged plan view showing the front end of the carbon dioxide gas laser tube shown in Fig. 2. detailed description

The technical solutions of the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings. It is obvious that the described embodiments are merely preferred embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of the present invention.

Fig. 2 is a view showing the structure of a carbon dioxide gas laser tube according to an embodiment of the present invention.

As shown in FIG. 2, the carbon dioxide gas laser tube of this embodiment includes a glass tube 20 including a tail port 4 and a front port 7, and a full port mirror 1' that matches the tail port 4 of the glass tube 20. The metal ring of the kovable fixed seal is connected to the glass tube 20 The tail port 4, the output mirror 11 is fixedly connected to the front port 7 of the glass tube 20 by a cleavable portion of the metal ring that mates with the front port 7 of the glass tube 20. A structure such as a screw hole 2 may be provided on the metal ring between the full mirror 1 and the tail port 4 of the glass tube 20 for connecting an external positive lead (for example, a positive high voltage line). Of course, it is also possible to provide a structure of a metal post on the metal ring between the full mirror 1 and the tail port 4 of the glass tube 20 to connect the external positive lead. Further, a positive electrode 5 is connected inside the metal ring between the full-mirror 1 and the tail port 4 of the glass tube 20, thereby introducing a current into the laser tube. A structure such as a screw hole 10 may be provided on the metal ring between the output mirror 11 and the front port 7 of the glass tube 20 for connecting the negative electrode lead, and further, between the output mirror 11 and the front port 7 of the glass tube 20. The inner side of the metal ring is connected with a spring 22 which is placed on the nozzle of the discharge tube 18 by a spring 22 and is connected to the metal ring between the output mirror 11 and the front port 7 of the glass tube 20, thereby introducing a current into the laser tube. Moreover, the metal ring between the full mirror 1 and the tail port 4 of the glass tube 20 comprises a foil portion 31 which is fixedly sealed to the full mirror 1 . The metal ring between the output mirror 11 and the front port 7 of the glass tube 20 includes a foil portion 32 that is fixedly sealed to the output mirror 11. The sheet portion 31 and the sheet portion 32 may be thin, so that the deformation thereof has little influence on the deformation of the entire metal ring structure. The sheet portion 31 and the sheet portion 32 may be made of a metal or alloy having a Brinell hardness of 55 or less for the purpose of milling and grinding, for example, may be made of copper, and in this case, also for the full-mirror 1 and the output mirror 11 Cooling.

Fig. 3 is an enlarged view showing the trailing end of the carbon dioxide gas laser tube shown in Fig. 2. In this embodiment, as shown in FIG. 3, the metal ring between the full-mirror 1 and the tail port 4 of the glass tube 20 further includes a crater 14 and a tail mirror base 12, a crater 14 and a tail mirror seat 12. The connection between the gradable portion 14 and the tail port 4 of the glass tube 20 can be performed, for example, by welding or the like, and the tail mirror portion 12 is welded to the sheet portion 31, for example. The kovable portion 14 is made of Kovar alloy. Of course, it is also possible to use the metal or alloy which is matched with other expansion coefficients and the port glass to form the kovable portion 14, as long as it can be matched and sealed with the glass nozzle. The tail mirror seat portion 12 may be made of metal iron, titanium, nickel or an alloy thereof, and preferably may be made of a metal or alloy of a low expansion coefficient or stainless steel.

Fig. 4 is an enlarged plan view showing the front end of the carbon dioxide gas laser tube shown in Fig. 2. As shown in FIG. 4, the metal ring between the output mirror 11 and the front port 7 of the glass tube 20 is shown in FIG. Also included is a kovable portion 23 and a front lens holder portion 25, and the kovable portion 23 and the front lens holder portion 25 may be connected by welding or the like, and the gradable portion 23 is sealed, for example, to the front port 7 of the glass tube 20, the front mirror The seat portion 25 is spliced to the sheet portion 32, for example. The kovable portion 23 is formed of Kovar alloy. Of course, the kovable portion 14 may be formed of a metal or alloy having a different expansion coefficient and matching with the port glass as long as it can be matched and sealed with the glass nozzle. The front mirror portion 25 may be made of metal iron, titanium, nickel or an alloy thereof, and preferably may be made of a metal or alloy having a low expansion coefficient, or may be made of stainless steel. According to another embodiment of the present invention, a method of preparing the above carbon dioxide gas laser tube is provided.

With continued reference to FIGS. 3 and 4, as shown in FIG. 3, the kovable portion 14 may be sealed at the tail port 4 of the glass tube 20 by a sealing point 15, and the other end of the kovable portion 14 may be welded by a solder joint 3 (for example The sub-arc joint 12, the sheet portion 31 is welded to the tail mirror portion 12, for example, and then the full-mirror 1 is bonded (for example, glued) to the sheet portion 31, and at the tail mirror portion 12 A threaded hole 2 is provided for connecting the positive electrode lead, and a positive electrode 5 is connected to the inner side of the tail mirror seat portion 12. As shown in FIG. 4, the crater 23 can be sealed at the front port 7 of the glass tube 20 by a sealing point 8, and the other end of the kovable portion 23 is welded (for example, argon arc welded) to the front lens holder through the solder joint 9. The portion 25, the sheet portion 32 is spliced to the front mirror portion 25, for example, and then the output mirror 11 is bonded (for example, glued) to the sheet portion 32, and the threaded hole 10 is provided on the front mirror portion 25 for use. To connect the negative lead, a spring 22 is connected to the inner side of the front mirror portion 25, and the negative electrode 21 is placed on the nozzle of the discharge tube 18 by the spring 22 and connected to the front mirror portion 25.

Here, the surface of the sheet portion 31 for bonding the entire mirror 1 and the sheet portion 32 may be bonded to the sheet portion 31 and before the output mirror 11 is bonded to the sheet portion 32. The surface for bonding the output mirror 11 is ground and simultaneously detected. For example, it can be detected by a self-collimating inner focusing telescope (also called a collimator) so that the surface after grinding is perpendicular to the discharge tube 18. The central shaft, preferably, causes the ground surface to be coaxial with the discharge tube 18. Grinding can be carried out by hand or by using an electric grinder under numerical control to achieve the requirements of the present invention. In addition, CNC tool milling can also be used to achieve the grinding effect. For example, the electric motor can be mounted on a multi-axis, multi-angle CNC platform that can swing back and forth, left and right, up and down, and then adjust its position and angle to make it thin. The surface of the portion 31 for bonding the full-mirror 1 and the use of the sheet portion 32 Milling is performed on the surface of the bonded output mirror 11, and may be used in combination with milling so that the surface of the sheet portion 31 for bonding the full-mirror 1 and the surface of the sheet portion 32 for bonding the output mirror 11 are vertical. On the central axis of the discharge tube 18.

Further, when the full-mirror 1 is bonded to the sheet portion 31 and the output mirror 11 is bonded to the sheet portion 32, it is necessary to ensure that the mirror faces of the full-mirror 1 and the output mirror 11 are perpendicular to the central axis of the discharge tube 18. Preferably, the mirror faces of the full mirror 1 and the output mirror 11 are made coaxial with the discharge tube 18.

The term "matching" as used in the present application means that the mutually matching members can be fixedly sealed, not limited to the shape, size, etc. of the members, and the components that match each other without adverse effects The shape, size, etc. may vary. For the matching sealing of glass, there is a corresponding matching sealing metal material for different materials of glass, which has strict expansion coefficient requirements for the metal.

Although the material examples of some metal members are given in the above embodiments, for example, metal copper, iron, titanium, nickel or alloys thereof, or stainless steel, the present invention is not limited thereto, and those skilled in the art may use appropriate ones as needed. material.

Moreover, although some embodiments of the fixed sealing connection are given in the above embodiments, for example, sealing, splicing, and bonding, the present invention is not limited thereto, and those skilled in the art may use appropriate sealing connections as needed, for example It is also possible to use a method such as sintering as long as the sealing connection is fixed and not adjustable.

In addition, although the above embodiment has been described by taking the metal ring as three parts (sheet portion, mirror portion, and vane portion) as an example, the metal ring may include only two portions (sheet portion and metal). Another part of the ring). The foregoing is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The embodiments of the present invention may omit some of the technical features described above, and only solve the existing parts in the prior art. The technical problems, and the technical features disclosed, may be combined in any way, and any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the present invention are covered by the scope of the present invention. Accordingly, the scope of the invention is defined by the scope of the appended claims.

Claims

A carbon dioxide gas laser tube comprising a laser lens and a glass tube, wherein the laser lens is fixedly connected to a port of the glass tube by a residual ring that matches a port expansion coefficient of the glass tube The metal ring is disposed between the laser lens and the port of the glass tube, wherein the metal ring includes a fixed sealing connection of the kovable portion, the lens holder portion and the sheet portion, the gradable portion and the glass tube The port is sealed and sintered, the laser lens is adhered to the sheet portion, the sheet portion is an annular metal sheet structure, and the sheet portion is welded to the end surface of the mirror portion.

The carbon dioxide gas laser tube according to claim 1, wherein the sheet portion of the metal ring is made of a metal or an alloy having a Brinell hardness of 55 or less.

The carbon dioxide gas laser tube according to claim 2, wherein the sheet portion of the metal ring is made of copper.

The carbon dioxide gas laser tube according to claim 2, wherein the sheet portion of the metal ring is brazed to the seat end surface of the mirror portion.

The carbon dioxide gas laser tube according to claim 1, wherein the crater portion of the metal ring is made of a metal or an alloy having a coefficient of expansion matching the glass nozzle.

The carbon dioxide gas laser tube according to claim 1, wherein the crater portion of the metal ring is made of a Kovar alloy whose expansion coefficient is matched with a glass nozzle.

The carbon dioxide gas laser tube according to claim 1, wherein the lens holder portion of the metal ring is made of stainless steel.

8. The carbon dioxide gas laser tube according to claim 1, wherein The mirror portion of the metal ring is made of iron, nickel, titanium, and alloys thereof.

The carbon dioxide gas laser tube according to claim 1, wherein the lens holder portion and the cut portion of the metal ring are made of the same metal.

10. The carbon dioxide gas laser tube according to claim 1, wherein the metal ring is provided with a metal post or a hole for connecting an external wire.

A method for preparing a carbon dioxide gas laser tube, the carbon dioxide gas laser tube comprising a laser lens and a glass tube, wherein the method comprises:

Cutting a vane portion matching the port expansion coefficient of the glass tube to a port of the glass tube;

Brazing the sheet portion to the end surface of the lens holder portion;

Milling and grinding the surface of the sheet for bonding the laser lens to make the grinding surface of the metal ring perpendicular to the central axis of the discharge tube;

The laser lens is bonded to the milled and polished surface of the sheet portion.

Wherein the sheet portion, the mirror portion, and the cut portion are between the lens and the end of the glass tube.