JPS63115689A - Laser light transmission method - Google Patents

Abstract

PURPOSE:To improve the profitability, safety, etc., of a device by providing an optical fiber relay convertor at the medium of the optical fiber combined with a laser oscillating device and the optical fiber leading a laser light to a working point. CONSTITUTION:A fiber relay convertor 10 is arranged at the medium of the optical fiber 3 for transmission combined with a laser oscillating device 1 and the optical fiber 7 for working connected to the condensing objective lens 8 for working. A large diameter fiber capable of making a laser light incident with sufficient allowance is used for the optical fiber 3. The condensing diameter for performing the best working is easily obtd. with the optical fiber 7 by providing a relay convertor 10, the laser light is separated with allowance by the optical fiber 3 and the transmission of high safety can be performed up to a working part. At the time of changing the working no fiber change for long distance is necessary, so the profitability and safety of the device are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser beam transmission system, and particularly to a laser beam transmission system for long-distance transmission where the distance between a laser oscillation device and a processing point is long.

[Conventional technology]

Conventionally, laser light is transmitted through optical fiber.

As shown in FIG. 3, the laser beam enters an optical fiber I from a laser oscillation device 1 through a coupling lens 2, is transmitted over a predetermined length through a single fiber, and is guided to a processing condenser lens 8.

In addition, in order to provide a large number of processing points, as shown in FIG.
Inject it into 3.

It led to processing condensing lenses 81, 82, and 83.

[Problem that the invention seeks to solve]

In the conventional laser beam transmission system described above, since transmission is carried out using an optical fiber having one type and core diameter, there is a drawback that the incidence margin and maintainability are poor, especially in long-distance transmission.

The technical problem with laser beam transmission through optical fibers is that the properties of the laser beam after transmission are such that - after it is incident on the optical fiber, it must be Regardless of the spread angle of the light, the condensing diameter is determined by the core diameter of the fiber.

Therefore, if it is necessary to increase the energy density in laser processing, it is necessary to select an optical fiber with a small core diameter.

On the other hand, when entering a laser beam into an optical fiber.

In order to input a high-power laser with a large divergence angle into an optical fiber with a small core diameter, a short-focus coupling lens is used with N, A
A fiber with a large fiber aperture was required.

The present invention solves these problems of the conventional system by providing an optical fiber repeater converter between the input side and processing side optical fibers, which allows the core diameter or type to be changed. The present invention provides a laser beam transmission system that can simultaneously solve the difficulty of coupling on the incident side and deal with changes in energy density on the processing side.

[Means for solving problems]

According to the present invention, an optical fiber relay converter capable of changing the core diameter or type is provided between the optical fiber coupled to the laser oscillation device and the optical fiber that guides the laser beam to the processing point. A laser beam transmission system is obtained.

The following rest L3 〔Example〕 Next, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention. Laser light oscillated by a laser oscillator 1 is focused by a coupling lens 2 and enters an optical transmission fiber 3. In FIG. The transmission optical fiber 3 is for transmitting the laser beam to the optical fiber repeater converter 10, and a large diameter fiber is used that can enter the laser beam with sufficient margin.

A long focal length lens is also used for the coupling lens 2.

The laser light emitted from the transmission optical fiber 3 is expanded and collimated by the concave collimator lens 4 and the convex collimator lens 5 in the fiber relay converter 10, and is again focused by the converter coupling lens 6 to become processing light. The light is input into the fiber 7. This incident light is transmitted through the processing objective condenser lens 8.
The beam is narrowed down to a predetermined focal diameter and irradiated onto the workpiece 9 to perform laser processing.

FIG. 2 is a block diagram showing a second embodiment of the present invention, and the structure up to the input side of the optical fiber repeater converter 100 is the same as that in FIG. 1. In the relay converter 100, ゛ is a semi-transparent mirror 11
．． After the laser beam is divided into a plurality of parts by 12, the divided laser beams are incident on the processing optical fibers 71, 72, and 73 through the converter coupling lenses 61, 62, and 63, respectively. At this time, the characteristics of the optical fibers 71, 72, 73 for processing may be the same, or they may each have different core diameters and types. For example, by using different core diameters and types of optical fibers for processing, preheating at the same processing point can be
It can be used for main processing and post-heating.

There is an advantage that the processing objective condenser lenses 81, 82, and 83 can be used with the same characteristics.

〔Effect of the invention〕

As is clear from the above explanation, by providing a conversion repeater between optical fibers for optical transmission, the present invention makes it possible to easily obtain a condensing diameter for optimal processing of optical fibers for processing. , laser beams can be separated with sufficient margin using a transmission optical fiber. Therefore, it is possible to transmit data to the processing section using a large diameter and highly safe optical fiber, and on the other hand, the processing side fiber can be easily replaced with an optical fiber having arbitrary characteristics. As a result, there is no need to replace long-distance fibers even when processing details are changed, and great effects can be obtained in terms of economy, safety, and compatibility.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the present invention, FIG. 2 is a block diagram of a second embodiment of the present invention, and FIGS. 3 and 4 are diagrams showing a conventional laser beam transmission system. 1 and 2 are configuration diagrams. In the figure, 1 is a laser oscillation device, 2 is an input coupling lens, 3 is a transmission optical fiber, 4 is a concave lens for a collimator,
5 is a convex lens for collimator. 6 is a conversion unit coupling lens, and 7 is an optical fiber for processing. 8, 81, 82, 83 are condensing objective lenses for processing, 9 is a workpiece, 10, 100 is a fiber relay converter, 11.
12 is a transflective mirror, 61, 62, 63 is a conversion unit coupling lens, and 71, 72, 73 is an optical fiber for processing. Figure 3 $4 Figure

Claims (1)

[Claims] An optical fiber relay converter capable of changing the core diameter or type of the optical fiber is provided between the optical fiber coupled to the laser oscillation device and the optical fiber that guides the laser beam to the processing point. Laser light transmission method.