JPS6130293A - Laser light condenser - Google Patents

Abstract

PURPOSE:To suppress the deformation of an indium wire with time and to obtain stable processing performance by inserting and fixing a lens between the wires of a pair of guide rings formed under pressure so as to project. CONSTITUTION:The guide rings 13 having annular hollow grooves 13 for disposing the indium wire 9 into a ring shape in the prescribed position are provided on both sides of a lens 3. The groove 13a of each ring 13 is set in the sectional area smaller than the sectional area of the wire 9 so that the wire 9 builds up when the wire is fully pushed into the groove 13a. Then the wire 9 has high adhesiveness and positional stability in the stage of assembling the lens 3 and the reliability of the sealed part is improved. The thorough deformation is completed by the prescribed holding power of the lens by which the efficiency of heat transmission is maintained and the deformation of the wire 9 with time is prevented.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a laser focusing device.

Conventional configuration and its problems Laser focusing devices focus the laser beam energy using a lens, and this focused light can be used to cut, cut,
It is applied to laser processing equipment that performs processing such as drilling and welding.

FIG. 1 shows a conventional laser focusing device. A beam 1 emitted from a laser oscillator is deflected by a reflecting mirror 2 and then focused by a lens 3 into a spot 4 on the order of a wavelength. In addition to irradiating the workpiece 5 with the 2000 yen of light that this spot 4 has, an auxiliary gas 6 at a constant pressure corresponding to the processing purpose is applied to the nozzle 7.
By spraying more, processing efficiency is improved, lens 3
cooling.

It serves to prevent the adhesion of flying objects from the workpiece 5, and also to remove molten material, ie, dross 8, generated during processing such as cutting and drilling.

When holding lens 3, use the material of lens 3.

The curvature of each lens 3 differs depending on the diameter, focal length, thickness, etc., and in order to cope with this, a method is generally adopted in which indium wires 9 are arranged around the periphery of both surfaces of the lens. Since the indium wire 9 is easily deformed by a small pressure, it fits well to the spherical surface of the lens 3 and can hold the lens 3 uniformly, thereby reducing the heat generated by sealing the auxiliary gas 6 and passing the beam 1 during processing. It has a feature of increasing the transmission efficiency to the holder 10.

As shown in FIG. 1, when attaching the lens 3 to the holder 10, a compression ring 1 is used to hold the lens 3 at a constant pressure.
1 and a fixing ring 12 are used. compression ring 11
In this case, several slits lla are formed side by side in the axial direction, and are spaced at 90 degrees from each other in the circumferential direction, so as to have the characteristics shown in FIG. 2. And the slit width H is O
The dimensions of the compression ring 11 are set so that the pressing force P becomes a value appropriate for holding the lens 3 when the lens 3 is held.

- For example, in the case of a lens with a diameter of 1.5 inches (approximately 38 inches), the pressing force P is approximately 30 kg. However, the stress p applied to the indium wire 9 is 0.18 kg/in2, assuming that the cross-sectional area of the compression ring 11 is 170+=+a2. It is impossible to completely deform the lens 9 along the plane of the lens 3.

However, the force applied to the lens 3 during processing is such that the auxiliary gas pressure is 5 kg/crA and the lens effective diameter is 32II11.
That would be about 40 kg. This indicates that a stress greater than that applied when the lens is attached is applied to the indium wire 1-9 from the lens 3. Zunawaji, indium wire 9
Deformation progresses over time due to the initial pressure from the fixing ring 12 and the pressure applied by the ring during processing, and as a result, the indium wire 9 protrudes inside the lens 3 as shown in FIG. 5, and the lens attachment due to the protrusion. This causes the formation of gears in the parts. This reduces the sealing performance of the indium wire 9 and the heat transfer efficiency to the holder 10.

This not only causes thermal troubles associated with the irradiation of the beam 1 onto the indium wire 9 (this also means a decline in processing performance over time due to instability in lens holding).

In addition, in the structure shown in FIG. 1, it is difficult to assemble the wire 9 made of indium, which is a soft material, to the holder 10, and there is a risk of leakage from the joint part when setting the wire 9 made of indium in a ring shape. Disadvantages include the unbalance of the compressive stress applied to the lens 3 due to the uncertainty in the fixing position of the indium wire 9.

In other words, the conventional lens holder structure requires skill to assemble and has major drawbacks in that the lens 3 must be aligned at any time. There was inherent danger.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks of the conventional technology, and suppresses the deformation of the indium wire over time after the lens is attached.
In addition to achieving stable processing performance, it also simplifies assembly work.
The object of the present invention is to provide a laser focusing device that can increase the life of a lens.

Structure of the Invention This invention involves sandwiching a lens between the wires of a pair of guide rings in which indium or a wire having properties equivalent to or better than indium is pressure-molded into a ring-shaped groove in a protruding state. It is characterized by being fixed to. Pressure molding of the wire allows the lens to be fully deformed with the holding force, suppressing deterioration over time. In addition, assembly is easy and heat transfer efficiency is excellent, so the lens life is not reduced.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. On both sides of the lens 3, guide links 13 are provided which have a ring-shaped groove 132 for arranging the indium wire 9 in a ring shape at a predetermined position. Since the curvature of the uneven surface of the lens 3 differs depending on the focal length, a relief 14 is provided at the corner of the guide ring 13 to cover the smallest curvature of the lenses used, and the guide ring 13 can be shared. I'm measuring. Further, an O-ring 15 is provided to maintain airtightness between the boulder 10 and the guide ring 13.

The groove 13a of the guide link 3 is formed so that the indium wire 9 has a bulge of about 0.21 mm when the indium wire 9 is completely pushed into the groove 132. Set the cross-sectional area of . This is done by pre-tightening and press-forming the indium wire 9 and assembling it into the groove 13a of the kite ring 13.
Thereafter, the indium wire 9 is brought into close contact with the spherical surface of the lens 3 with a predetermined pressure.
As is clear from the figure, in order for the indium wire 9 to fit along the spherical surface of the lens 3, it must slightly protrude from the groove 13a of the guide ring 13. Note that the wire 9 may be made of a material other than indium that has properties equivalent to or better than indium.

The compression ring 11 for keeping the holding force of the lens 3 constant and the fixing ring 12 for giving the holding force are the same as those of the conventional structure. Other parts common to those in FIG. 1 are given the same reference numerals and explanations are omitted.

In this way, the indium wire 9, which has been press-formed and assembled in a predetermined position, has high adhesion and positional stability when the lens 3 is assembled, and ensures a good fit with the spherical part of the lens. This improves the reliability of the seal. In addition, since the contact area between the pressure-formed indium wire 9 and the spherical surface of the lens 3 is very small at the start of assembly, complete deformation is achieved with a predetermined lens holding force, which improves heat transfer efficiency. It is possible to maintain the indium wire 9 and prevent deformation of the indium wire 9 over time. Furthermore, by incorporating the kite ring 13 into the volta 10, indium 9
The assembly work becomes easier.

Effects of the Invention According to the present invention, by preventing wires made of indium or the like from deforming over time, it is possible to achieve long-term stabilization of processing quality, prevention of reduction in heat transfer efficiency, that is, improvement of lens life, and elimination of retightening work. In addition, by improving the reliability of the sealing part, it is possible to stably hold the lens by keeping the sole position constant, prevent the wire from protruding, and confirm the sealing performance at the wire joint in advance.

Further, by simplifying the assembly work, it is possible to eliminate the risk of damage to the lens use surface due to distortion or protrusion of the wire during assembly.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the conventional example, Figure 2 is a pressure Kerr strain characteristic diagram of the compression ring, Figure 3 is a perspective view of the compression ring, Figure 4 is a side view of the compressed state, and Figure 5 is the indium FIG. 6 is a cross-sectional view showing a protruding state of the manufactured wire, and FIG. 6 is a cross-sectional view of an embodiment of the present invention. 3... Lens, 9... Indium wire, IO・
...Holder, 11...Compression ring, 12...Fixing ring, 13...Guide ring, 13a...Ring-shaped groove, 14...Escape, 15...○ ring Fig. 1 Figure 4Figure 2

Claims (1)

[Claims] a pair of guide rings, each of which has a ring-shaped groove formed in its end surface, and a wire made of indium or a wire having properties equal to or better than indium is pressure-molded into the groove, protruding from the end surface;
A lens sandwiched between the wires of these guide rings, a holder into which the lens and the guide ring are inserted and supported on a receiving stage, and a compression ring superimposed on the guide ring on the opposite side of the receiving stage. and a fixed ring that is supported by the holder and presses the compression ring.