JP2876915B2 - Laser marking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser marking apparatus for marking a workpiece by using a laser beam, and more particularly to a correction mechanism when a marking position is shifted. The present invention relates to a laser marking device.

[0002]

2. Description of the Related Art In a laser marking apparatus for marking a workpiece by using a laser beam, the workpiece is displayed on a CRT by using a monitor optical system in order to accurately determine the position of the marking, and the laser beam is applied. In many cases, a mark for positioning such as a cross line is displayed at a position to be irradiated.

[0003] In the monitor optical system, a CCD camera is usually used. Therefore, conventionally, the workpiece and C
A reticle having a cross line, for example, is arranged on the optical path between the CD cameras, and an image of a workpiece is formed at both positions of the reticle and the CCD element. And
The position of the cross line was previously adjusted to the irradiation position of the laser beam, and an image in this state was displayed on a display. When the irradiation position of the workpiece deviates from the position of the cross line, the operator of the laser marking device checks the position on the display, and adjusts the irradiation position of the laser beam so that these positions match on the display. I was adjusting.

[0004]

However, in such a conventional laser marking apparatus, a reticle and a CC
Since an image of the workpiece is formed at both positions of the D element, the mechanism of such a monitor system becomes complicated, and it is difficult to reduce the size of the laser marking device itself. Also, when the position at which the workpiece should be marked must be shifted from the position of the cross line,
It is necessary to add this movement amount for each marking data for controlling the scanning position of the scanning optical system, and there is a problem that the procedure is complicated and takes time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a laser marking device capable of correcting a position shift by a simple operation when a position on a workpiece to be marked is shifted.

[0006] Another object of the present invention is to provide a laser marking device capable of achieving downsizing of the device.

[0007]

According to the first aspect of the present invention, there is provided a laser oscillator, a scanning optical system for two-dimensionally scanning a laser beam output from the laser oscillator on a workpiece, and the scanning optical system. A camera that captures an image of the workpiece through the system, a display that displays an image captured by the camera, and a mark generation unit that electronically generates a mark indicating an irradiation position of the laser beam on the workpiece on the display. A moving operation means for relatively moving a position to be irradiated with laser light on the workpiece with respect to the mark on the display; and a moving operation means for a plurality of reference points defined on the workpiece. When the mark positions are relatively matched, the marking data for controlling the scanning position of the scanning optical system is corrected accordingly. A marking data correction means is provided in the laser marking device that.

That is, according to the first aspect of the present invention, a camera for photographing a workpiece through a scanning optical system is prepared, and a cross-line is electronically displayed on a display for displaying an image of the workpiece photographed by the camera. And so on. Also, the image of the workpiece on the display can be moved relatively to a mark such as a cross line by, for example, tapping a keyboard, and a plurality of reference points on the workpiece are respectively set. When the mark is matched with the mark on the display, the marking data is corrected using the data on the relative positional relationship so that the mark and the point to be marked at any point on the workpiece match. .

Further, in the present invention, since a mark such as a cross line is generated electronically on the display, the mechanism for monitoring can be simplified.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows an outline of the configuration of a laser marking device according to an embodiment of the present invention. The laser marking device includes a CCD camera 12 for photographing a workpiece 11. CCD camera 12
Is the fθ lens 13, the first scanner mirror 14, the second
Scanner mirror 15 and dichroic mirror 16
, An image of the workpiece 11 is received, and a monitor image is displayed on the CRT 18. The CRT 18 is also supplied with a cross line signal 21 from a digital electronic line generator 19, and
The cross line is superimposed on the image shown in FIG.

The digital electronic line generator 19 also outputs position data 22 representing the position of the cross line. The position data 22 is input to a computer 23 for controlling the laser marking device. The computer 23 is provided with a keyboard 24 for correcting the marking data. The computer 23 outputs the laser light 2 output from the laser oscillator 25.
6 is connected to a scanner driver 27 for controlling scanning. The scanner driver 27 connects the first and second galvanometer-type optical scanners 28 and 29. Here, the first galvanometer-type optical scanner 28 controls the scanning in a specific direction (main scanning direction or sub-scanning direction) with respect to the first scanner mirror 14, and the second galvanometer-type optical scanner 28 The scanner 29 is connected to the second scanner mirror 15.
In contrast, scanning in a specific direction (sub-scanning direction or main scanning direction) orthogonal to this is controlled.

Also, the work piece 1 is placed on the CRT 18 such that the irradiation position of the work piece 11 coincides with the position of the cross line.
When the movement control of No. 1 is performed, the movement amount signal 31 indicating the movement amount of the workpiece 11 input from the keyboard 24 at this time is input to the computer 23 as a correction amount for the positional deviation. ing.

In the laser marking apparatus having such a configuration, for example, three reference positions are marked on the workpiece 11 in advance. Then, the respective adjustments are performed using the keyboard 24 so that each of the reference positions shown on the CRT 18 exactly matches the center position of the cross line fixedly displayed at the center of the CRT 18. This is because the arbitrary position where the marking is performed always coincides with the position of the cross line. The computer 23 determines the two of the workpiece 11 based on the correction amounts for the three reference positions input from the keyboard 24.
First and second scanner mirrors 1 for a three-dimensional plane
The marking data for movement control in steps 4 and 15 is corrected.

The laser beam 26 output from the laser oscillator 25 in a state where such a work for correction is performed is
After being reflected by the dichroic mirror 16, the first and second galvanometer optical scanners 28, 2
9, the scanning position is specified two-dimensionally by these, and marking is performed on a predetermined position of the workpiece 11 specified by the cross line on the CRT 18. At this time, the first and second galvanometer-type optical scanners 28 and 29
Is controlled based on a position control signal 33 sent to the scanner driver 27 from the printer.

It is assumed that such a laser marking device causes a positional shift in laser beam irradiation when performing marking. In this case, the operator re-uses the above-mentioned markings of the respective reference points to obtain the CR at these positions.
The image of the workpiece 11 is moved so that the reference point and the cross line match on T18. At this time, the operation of the keyboard 24 is also performed. The movement amount is sent to the computer 23 as a movement amount signal 31 and added as an offset amount to the marking data.

If such a correction operation is performed for the above-described plurality of reference points, it is possible to completely correct the positional deviation of the marking due to the fluctuation of the gain or the offset amount caused with the lapse of time. .

As described above, according to the present embodiment, a plurality of reference points are provided to correct the positional deviation of the marking with respect to these reference points. For example, when three or more reference points are provided, two reference points are provided. There is an advantage that the displacement can be completely corrected at any point on the dimensional plane.

In the embodiment, the operation for correction is performed by using the keyboard 24. However, a pointing device such as a mouse or other input means can be used freely. Further, in the embodiment, the image of the workpiece is moved on the CRT 18 with the cross line fixed, but it goes without saying that the cross line may be moved with the image fixed.

[0020]

As described above, according to the present invention, the mark is electronically displayed on the display, so that the reticle having the cross line is not required, the optical system is simplified, and the display is displayed on the display. Can be changed to various kinds of marks such as cross lines.
Further, if the positions of the marks are made to coincide with a plurality of reference points, the irradiation position of each point on the workpiece can be corrected, so that the correction operation can be performed easily and easily. There is also an effect.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a circuit configuration of a laser marking device according to an embodiment of the present invention.

[Explanation of symbols]

 11 Workpiece 12 CCD Camera 14 First Scanner Mirror 15 Second Scanner Mirror 16 Dichroic Mirror 18 CRT 19 Digital Electronic Line Generator 21 Cross Line Signal 22 Position Data 23 Computer 24 Keyboard 25 Laser Oscillator 27 Scanner Driver 28 First Galvanometer type optical scanner 29 Second galvanometer type optical scanner 31 Movement amount signal 33 Position control signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H01S 3/101 B23K 26/00 B23K 26/02 H01S 3/00

Claims (1)

(57) [Claims] 1. A laser oscillator; a scanning optical system for two-dimensionally scanning a laser beam output from the laser oscillator on a workpiece; a camera for photographing the workpiece through the scanning optical system; A display for displaying an image photographed by the camera; a mark generating means for electronically generating a mark indicating the irradiation position of the laser beam on the workpiece on the display; and Moving operation means for relatively moving a position to be irradiated with laser light on the workpiece; and moving the mark relative to the plurality of reference points defined on the workpiece by the moving operation means. Markin which, when matched, corrects marking data for controlling the scanning position of the scanning optical system accordingly. A laser marking device comprising: a data correction unit.