JPS6073307A - Positioning apparatus of surface - Google Patents

Abstract

PURPOSE:To effect improvement of positioning accuracy with reduced image distortion of display unit and effect due to visually viewed angle difference, by allowing the reference position pattern originated from a reference pattern generator to be displayed in an overlapped manner with an image signal of each reflection bright point image by the positioning symmetrical planes obtained in the image developing member. CONSTITUTION:An image signal of reflection bright point images on two points an positioning symmetrical planes developed by a camera constructed of an oscillator 73 delivering clock signal CLK, horizontal synchronizing signal HT, and vertical synchronizing VT to ITV71, ITV driving circuit 72 is supplied to an overlapping circuit 9. Further, a marker pattern signal is supplied to the circuit 9 which indicates the reference position from a pattern generator 10 and upon overlapping with the image signal, it is displayed on a TV monitor 8. Accordingly, even if at an image distortion caused by horizontal as well as vertical scanning voltage fluctuations, etc., positions of bright point image and marker pattern will not be deviated and high accuracy positioning becomes available.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a surface positioning device used for adjusting the relative position of a processing laser beam oscillator and a workpiece surface in a laser processing device, for example. .

[Technical background of the invention]

When cutting a workpiece by irradiating it with a laser beam, for example, if the distance between the laser oscillator and the workpiece surface changes, or if the workpiece surface is tilted, the processing conditions will change and the process will be interrupted. This is not preferable as it causes variations in the results. Conventionally, the laser oscillator or The optimal relative position of the workpiece is taught to the NC device. FIGS. 1 and 2 are diagrams for explaining a conventional positioning device for determining the above-mentioned optimal relative position. In this device, a light beam 2a generated by a light source 1 is divided into two parts by a noof mirror 3, and then reflected by reflection mirrors 4 and 5, each of which is applied to a workpiece 6.
irradiate the surface of At this time, each of the light beams 2b, 2
For e, the optical path is set so that it intersects at one point A in the optical path. Then, the reflected bright spot images B and C of the light beams 2b and 2c on the surface of the workpiece 6 are captured by the imaging device 7, and the captured images are displayed on the television monitor 8.

On the screen of the television monitor 8, there are markers B/, C/ indicating the reference positions where each of the above-mentioned reflective bright spots @BeC should originally be displayed. The intersection position of the light beams is indicated by a chain double-dashed line.

Then, the position of the workpiece 6 is adjusted, for example, in order to match the reflected bright spot images B and C swept by the imaging units #i and 7 with the positions of the marker patterns B/ and CI. Thus, the distance between the laser oscillator and the surface of the workpiece 6 and the irradiation angle of the laser beam are kept constant.

[Problems with background technology]

However, in such a conventional positioning device, the markers/mother turns B/, c/ indicating the reference position are written on the screen of the television control monitor 8, and this is compared with the displayed image. If image distortion or display position shift occurs due to fluctuations in the horizontal or vertical scanning voltage of the John monitor 8, the display image and marker pattern may be distorted due to the viewing angle between the display image and the reference position marker pattern relative to the screen. Since the position of the position changes, the positioning accuracy is unstable.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a surface positioning device that improves positioning accuracy by reducing the effects of image distortion on a display unit and differences in viewing angles.

[Summary of the invention]

In order to achieve the above object, the present invention provides a reference pattern generating section that generates a reference position pattern, and generates a standard turn of the reference position generated by the reference pattern generating section for each reflected brightness by the positioning target surface obtained by the imaging section. This is superimposed on the point image image signal and displayed on the display unit.

[Embodiments of the invention]

FIG. 3 is a diagram showing the configuration of the positioning device 4 in one embodiment of the present invention. In this figure, the same parts as those in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.

1g shot! The device M7 is necessary for the operation of an industrial television (ITV) camera 71 and an ITV drive circuit 72 that drives this ITV camera 71, and is required to operate a lock signal CLK, a horizontal synchronization signal HT, and a vertical synchronization signal. The oscillator 73 generates a No. 41 VT. Then, the image signal of each reflected bright spot image B p C reference Φ Yosoha Noriyoshihiro captured by the ITV camera 71 is supplied to the superimposition circuit 9 .

On the other hand, this superimposition circuit 9 is supplied with a marker pattern signal indicating a reference position from a pattern generator 10. As shown in FIG. 4, this /'P turn generation device 10 includes a pattern memory 1 storing the marker pattern, a clock signal CLK generated from an oscillator 73 of the imaging device 7, a horizontal synchronization signal HT, and a vertical synchronization signal. An address generation circuit 1 that generates address information in synchronization with the signal VT, accesses the pattern memory 11 based on this address information, and outputs a marker or a turn code.
It is made up of 2 and 4. This address generation circuit 12 includes, for example, a first counter that starts counting a clock signal CLK to generate vertical address information every time a vertical synchronization signal is supplied, and a first counter that starts counting a clock signal CLK to generate vertical address information every time a horizontal synchronization signal is input. and a second counter that starts the argument of the signal CLK and generates horizontal address information.

The superimposing circuit 9 mutually superimposes the image signal from the image pickup device 7 and the marker gloss turn signal from the nine turn generator 10, and converts the M amount signal to the TV-)=1-n monitor ( (TV monitor) 8 for display.

Since the configuration is like this, the oscillator 73 of the imaging device 7
A clock signal CLK and horizontal and vertical synchronization signals HT and VT are generated from 1 to drive the TV camera 71, and a light beam is generated from the light source (for example, a laser oscillator) 1, each of the light beams 2a and 2b is Bright spot images B and C reflected by the surface of the workpiece 6 are captured by an ITV camera 71, and the captured image signal is introduced into the superimposition circuit 9.

On the other hand, each signal CLK t HT+V from the oscillator 73
When T is generated, address information is generated from the address generation circuit 12 of the turn generation device fi and 10, and the turn memory 11 is accessed, whereby a marker pattern signal is output from the turn turn memory 11. It is introduced into the superimposition circuit 9.

As a result, in the superimposing circuit 9, each reflected bright spot image and the marker/turn are mutually N ranged, and the output signal is T.
displayed on the V monitor 8. That is, each reflected bright spot image and the marker pattern are displayed on the TV monitor 8 under the same conditions. Therefore, even if image distortion were to occur due to fluctuations in the horizontal and vertical scanning voltages of the TV monitor 8, this distortion would be equally applied to each bright spot image and the marker's arm turn. , each bright spot image and marker due to the above distortion! The positional deviation between the turn and the turn is approximately zero. ・Figure 5 shows an example of the display state of each bright spot image and marker pattern in this embodiment, and B and C represent each reflected bright spot image, Also A' ＃ B'
tC' indicates each marker pattern. In addition,
The two-dot chain line A is drawn for convenience of explanation to indicate the position of the intersection A of each party beam, and is not actually displayed.

Then, each bright spot image and marker! When a turn is displayed, each bright spot image B and C is displayed as a marker pattern B'
, C' is moved to match the position of the workpiece 6. For example, as shown in Fig. 6(,), each reflected bright spot image B
, C is also outside the marker patterns B/ and C/, by moving the position of the workpiece 6 toward the imaging device to the position indicated by the double-dot chain in the figure. , performs positioning. Also, as shown in Figure 6(b), the reflection)'
Distance dl between the positions of the four-point images B and C and the position of the cross-bright spot image A
, d2 are different, the angle of the surface of the workpiece 6 is fixed at two points in the same figure! Positioning is performed by making corrections as shown at @. Then, information on the final position is inputted to an NC device (not shown), and is used as position control information for a workpiece support table (not shown) in temporary laser cutting.

In this way, with the device of this embodiment, the position (reference mark pattern for rounding) is superimposed on the image signal of each bright spot image and displayed on the TV monitor 8 under the same conditions. , it is possible to eliminate display positional deviations between each bright spot image and the marker pattern due to image distortion, and it is also possible to eliminate positional deviations due to differences in viewing angle with respect to the screen of the TV monitor 8. Accurate positioning can be performed.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, two beams ``□ beam 2a
, 2b can be used to correct the inclination of the workpiece 6 in only one direction, but if necessary, the four light beams can be adjusted at 90 degrees
It may be possible to irradiate the surface of the workpiece 60 with an interval of 100° to correct the inclination of the workpiece 6 in two directions. In addition, the gist of the present invention also includes the types of marker patterns, the configuration of the imaging unit (for example, those using a solid-state imaging device), the configuration of the reference position pattern generation unit, the types of light beams, the types of surfaces to be positioned, etc. It can be implemented in various ways without departing from the above.

〔Effect of the invention〕

As described in detail above, the present invention displays the image on the display unit by superimposing the pattern indicating the reference position on the image signal of each reflected bright spot image. It is possible to provide a surface positioning device that can reduce the influence and improve positioning accuracy.

[Brief explanation of drawings]

Figures 1 and 2 are for explaining a conventional positioning device, and Figure 1 is a schematic diagram of the device;
Figure 2 is a schematic diagram showing the display state of a television monitor;
3 to 6 (a) and 6 (b) are for explaining a positioning device in one embodiment of the present invention, FIG. 3 is a schematic configuration diagram of the device, and FIG. 4 is a diagram similar to that in FIG. A block diagram showing the configuration of the pattern generator, which is the main part of the
A schematic diagram showing an example of the display state of the device shown in the figure, and FIGS. 6(a) and 6(b) are schematic diagrams for explaining the positioning operation. 1...lIL 2a, 2b...light beam, 3...
Half mirror 14, 5...Reflection mirror, 6...Workpiece, 7...Photography device, 8...Television monitor, 9...Superimposition circuit, 10...Pattern generator, 1
DESCRIPTION OF SYMBOLS 1... Pattern memory, 12... Address generation circuit, 71... ITV camera, 72... ITV drive circuit, 73... Oscillator, B, C... Reflected bright spot image, A/
, B/, C/... marker pattern.

Claims (1)

[Claims] a light projection unit that irradiates the positioning target surface with a plurality of light beams that intersect with each other at one point in the optical path; and an imaging unit that captures a reflected bright spot image of each beam on the positioning target surface;
a reference pattern generating section that generates a reference position pattern corresponding to the intersection position of each of the reflected bright spot images and each of the party beams; and a reference pattern generating section that generates a reference position pattern generated by the reference iR turn generating section, to the imaging section. A display section 1 of the fourth turn of the display position of each reflected bright spot image displayed on this display section includes a display tτ11 that displays an image superimposed on the image signal of each captured reflected bright spot image. A device for determining the position of a surface, characterized in that the surface to be positioned is positioned by relatively moving the position of the surface to be positioned or the positions of the light projecting unit and the imaging unit so as to match the surface directly.
iL.