OPTICAL PATH AXIS ALIGNING DEVICE OF LASER BEAM MACHINE

Abstract

The invention provides a device for improving the efficiency of operation for aligning the optical axis of mirrors disposed in an optical path for laser transmission in a laser beam machine. The laser beam LB output from a laser oscillator of a laser beam machine is transmitted via multiple mirrors M1, M2 etc. disposed in the optical path thereof to a torch. A mirror for receiving the laser beam LB from the mirror M2 is removed and a laser beam detecting device 100 is attached in replacement thereof. The laser beam LB is passed through a cross-shape target 122, a portion of which is branched and taken as image by a laser beam detecting picture element 180. The data is sent to a personal computer 200 disposed near the mirror M2 being subjected to alignment, and displayed as image data C1. The operator operates adjusting screws 71 and 72 to change the tilt angle of the mirror M2 while watching the image data C1, so as to align the optical axis of the laser beam LB.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an explanatory view showing the outline of an aligning device of a laser beam optical path according to the present invention;

FIG. 2 is an explanatory view of a laser beam detecting device;

FIGS. 3A and 3B are explanatory views showing interference light patterns;

FIG. 4 is an explanatory view showing another embodiment of the present invention;

FIG. 5 is an explanatory view showing an optical path system of a laser beam machine;

FIG. 6 is an explanatory view showing a basic structure of a laser beam machine;

FIG. 7 is an expansion plan of the mirror arrangement;

FIG. 8 is an explanatory view of the burning method;

FIG. 9 is an explanatory view of the burning method;

FIGS. 10A, 10B and 10C are explanatory views showing the shapes of the burning; and

FIG. 11 is an explanatory view showing the method for aligning the optical path axis using the burning.

Claims

1. An optical path axis aligning device of a laser beam machine having an optical path with multiple mirrors for transmitting a laser beam from a laser oscillator to a machining torch, comprising: a laser beam detecting device attached to a mirror position to which the laser beam is irradiated;a personal computer for receiving laser beam data detected by the laser beam detecting device, subjecting the same to image processing, and displaying the same on a screen; anda mirror from which the laser beam is irradiated, the tilt angle of the mirror being aligned based on the data displayed on the personal computer.

2. The optical path axis aligning device of a laser beam machine according to claim 1, wherein the laser beam detecting device comprises: an adaptor for attaching the same to a center position of the laser beam machine;a beam splitter for splitting and branching the laser beam passing through the adapter;a beam absorber for absorbing a high-power beam split by the beam splitter; anda detecting element for receiving the laser beam passing an optical system for converting the other low-power beam split by the beam splitter to have a beam width and energy suitable for detection.

3. The optical path axis aligning device of a laser beam machine according to claim 1, wherein a cross-shape target is disposed at a center position of the machine, and when the laser beam passes the center position of the machine, it is possible to confirm that the laser beam has passed the center position of the laser beam machine by detecting an interference pattern of the laser beam by the laser beam detecting device.

4. The optical path axis aligning device of a laser beam machine according to claim 1, wherein a mark enabling to determine the center position of the machine is set in advance on the display screen of the beam position of the laser beam detecting device without disposing a cross-shape target at the center position of the machine, which makes it possible to confirm via the display screen that the laser beam has passed the center position of the laser beam machine.