KR0136047B1 - Apparatus and method of measuring a gap and equilbrium of objects - Google Patents

Abstract

The present invention relates to a device and a method for measuring the surface spacing and balance between the object to be measured, in the conventional measurement of the surface spacing between the object to be measured, the actual interval when the object is inclined incorrectly fixed to the transfer device If the impurity is introduced between the measured object intervals, the laser signal is scattered by the impurity and normal measurement is not possible. In the case of having a laser beam, it is impossible to measure an arbitrary distance by using a laser method. It is not possible to measure an edge of a part, such as an edge having a minimum gap, that is, an interval of L1, but only an L2. Because of the disadvantages, the balance of the two measured objects calculated by the difference between the minimum and maximum intervals cannot be measured.

Therefore, in order to solve this problem, the present invention is easy to measure and illuminate by automating the measurement of the spacing and balance of the two surfaces of the assembly having a small spacing by using two cameras facing each other with built-in coaxial lighting. Apparatus and method for measuring the spacing and balance between objects under test to set the state and determine the optimum measuring position by autofocus.

Description

Measuring device and method for measuring gap and balance between objects

1 is a block diagram showing the structure of a conventional apparatus for measuring the distance between objects to be measured.

2 is a flowchart showing a conventional method for measuring a gap between measured objects.

3 is a signal waveform diagram of a laser sensing unit due to a distance between conventional objects.

4 is a cross-sectional view showing that the position of the conventional measured object is wrong.

5 is a cross-sectional view showing a case where a conventional measured object has a plurality of intervals.

6 is a cross-sectional view showing the minimum interval and the maximum interval of the conventional measurement object.

7 is a block diagram showing the structure of the device for measuring the spacing and balance between the measured objects of the present invention.

8 is a flowchart showing a method for measuring the spacing and balance between the objects to be measured of the present invention.

9 is a cross-sectional view showing the gap shape and the boundary detection line between the measurement object of the present invention.

10 is a diagram showing detection line boundary lines between the measured objects of the present invention.

11 is a partial cross-sectional view showing the structure of the balance measurement device between the object to be measured of the present invention.

* Explanation of symbols for the main parts of the drawings

11: 1st CCD camera 12: 2nd CCD camera

13: first barrel 14: second barrel

15: first transflective mirror 16: second transflective mirror

17: first optical fiber 18: second optical fiber

19: first halogen lamp light source 20: second halogen lamp light source

21: first transfer device 22: second transfer device

23: transfer control unit 24: image processing unit

25 computer 26 measured object

The present invention relates to a device and a method for measuring the surface spacing and the balance between the measured objects, in particular the surface spacing and the balance between the measured objects by using two cameras facing each other in which coaxial illumination is integrally installed Is an apparatus and method for setting an illumination state by automating measurement and determining an optimal measurement position by auto focus.

The configuration and operation of a measuring apparatus and a method for measuring the surface spacing between a conventional target object will be described with reference to FIGS. 1 and 2 as follows.

First, the configuration of the mechanical measuring device is as follows.

A laser generator 1 for generating a laser to measure the surface spacing between the objects 4 and between the laser generator 1 and the laser detector 3 to be measured And a laser detector (3) for detecting a laser beam passing through a surface interval between the object (2) fixed to the upper and lower conveyance device, and the measurement object (4) fixed to the conveying device (2) and A / D conversion unit 5 for converting the analog signal sensed by the laser detector 3 into a digital signal and the converted digital signal are input to measure the surface spacing between the measured object 4. , A transfer control unit 6 for controlling the transfer device 2 for transferring the measured object 4 up and down by the control signal of the computer 7 for calculation.

FIG. 2 is a flowchart illustrating a method for measuring a gap between objects under a conventional laser. The method of driving a conveying device to move the object under test while initializing each part of the system and generating a laser is performed. A first step and a second step of determining a plane spacing between the object to be measured 4 by converting the laser signal of the first step, and a third step of carrying out the transfer of the object to be measured 4 as a result of the determination And a fourth process of measuring the surface spacing between the objects to be measured 4 by calculating the time T1 at the time of stopping the transfer of the object to be measured 4.

Referring to the operation of the measuring device and method for measuring the surface spacing between the conventional object to be configured as described above are as follows.

The object to be measured is placed on the conveying apparatus 2 and fixed, and the laser generating apparatus is initialized by the conveying apparatus 2, the conveying control unit 6, and the A / D converter 5 in the computer 7. (1) and the laser detector (3) are operated.

At this time, when the laser is generated by the operated laser generating device 1, the transfer control unit 6 is operated by the computer 7 while moving the feeder 2 at a constant speed. The measured object 4 by the transfer device 2 when the laser generated through the surface spacing between the measured objects 4 is output by the A / D conversion unit 5 while being detected by the laser detector 3. As the feeding stops, as shown in FIG. 3, when the laser passes through the gap between the objects 4, the value increases to a high value. If there is no gap, the gap between the objects 4 becomes low. The surface spacing is calculated by the computer 7 as the time T1 during which the output of the laser detector 3 is kept high, and the surface spacing is the product of the time T1 and the feed rate of the conveying apparatus 2 ( Calculated by T1 × feed rate) and converted to a digital signal by the A / D converter 5 to When the input (7) to which the spacing measured between the measured object (4) is completed.

However, in the measurement of the surface spacing between the conventional measuring objects, when the measured object 4 is incorrectly fixed to the feeder 2 and tilted, measurement of a value smaller than the actual distance B as shown in FIG. If the impurities are introduced between the intervals of the measured object 4, the laser signal is scattered by the impurities, and thus, normal measurement cannot be performed. As shown in FIG. When the surface between the objects to be measured 4 has a plurality of gaps L1 and L2, an arbitrary distance cannot be measured by a method using a laser and forms a stage like an edge E having a minimum distance. The edge of the part, that is, the distance of L1 cannot be measured, only L2 can be measured, and at this time, only the minimum distance can be measured, and as shown in FIG. 6, the difference between the minimum distance (C) and the maximum distance (D) ( The flatness of two measured objects (4) calculated by C-D) There was a problem that the shape can not be measured.

Therefore, in order to solve this problem, the present invention is easy to measure and illuminate by automating the measurement of the spacing and balance of the two surfaces of the assembly having a small spacing by using two cameras facing each other with built-in coaxial lighting. It is to be able to determine the optimum measuring position by setting status and auto focus.

With reference to the accompanying drawings 7 to 9 with respect to the configuration and operation of the surface spacing and balance between the object to be measured and the measuring method of the present invention for achieving the above object is as follows. First, the mechanical configuration is as follows.

First and second CCD cameras 11 and 12 for capturing an image of an object 26 to be measured by attaching a high magnification lens so as to face each other and integrated with coaxial lighting, and the first and second facing cameras The first and second barrels 13 and 14, which are integrated with the second CCD cameras 11 and 12 and have the first and second semi-transmissive mirrors 15 and 16 embedded therein, and the first and second First and second transflective mirrors 15 and 16, which are embedded in the second barrels 13 and 14 and transmit half and half of light, and the first and second barrels 13 And a first and second beam for transmitting an optical signal from the first and second halogen lamp light sources 19 and 20 while connecting the first and second halogen lamp light sources 19 and 20 to (14). First and second halogen lamp light sources 19 and 20 for outputting an optical signal through second optical fibers 17 and 18 and the first and second optical fibers 17 and 18. And the first and second transfer devices 21 and 22 connected to the first and second CCD cameras 11 and 12. A feed control unit 23 which is operated to move left and right at a predetermined speed, an image processing unit 24 which processes an image displayed by the first and second CCD cameras 11 and 12 and inputs it to the computer 25; It is composed of a computer 25 for measuring the interval according to the input image to calculate the numerical value.

8 is a flowchart illustrating a method of measuring plane spacing between objects to be measured using coaxial illumination of the present invention, wherein the first and second CCD cameras 11 and 12 facing each other after power is applied to each part of the system. A first process of initializing the surface spacing of the object to be measured 26 by illuminating using coaxial illumination integrated with the device; and transferring the first and second CCD cameras 11 and 12 to 26) a second process of determining an optimal focus between the plane spacing, a third process of detecting a boundary line by detecting a boundary line and an intersection point between the object to be measured 26, and recognition of the third process A fourth step of calculating the surface spacing between the measurement target object 26 using the first and second CCD cameras 11 and 12 by the defined boundary line, and the first and second CCD cameras 11 and 12 It is composed of a sixth process of measuring and completing the balance by the difference in the plane spacing calculated by the).

Referring to the operation of the device and the method of measuring the surface spacing and balance between the object to be measured configured as described above are as follows.

First and second integrally formed with the first and second CCD cameras 11 and 12 facing each other after applying power to the first and second transfer devices 21, 22 and the image processor 24 The light emitted from the first and second halogen lamp light sources 19 and 20 is provided to the first and second transflective mirrors 15 and 16 embedded in the two barrels 13 and 14. Outputting through the second optical fibers 17, 18, half transmitted and half reflected, and initializes the surface spacing of the object to be measured 26 causes the surface spacing between the objects 26 to be measured. Is input to the computer 25 while the image processing is performed, the initial screen interval is measured.

Then, the first and second transfer devices 21 and 22 are transferred by operating the feed control unit 23, so that the first and second CCD cameras 11 and 12 are previously positioned in which the object to be measured 26 is positioned. After moving to the designated position, the first and second CCD cameras 11 and 12 are moved toward the object to be measured 26, and the first and second CCD cameras 11 and 12 are automatically moved to the focus positions. Find by focus.

In this case, the autofocus is obtained when the first and second CCD cameras 11 and 12 are well-focused, and the differential value of the image is increased while the image is unfocused. Therefore, if focus is not achieved by auto focus, the first and second CCDs 11 and 12 are fed back to adjust the positions of the first and second CCD cameras 11 and 12 to obtain the best focus. In search of the measurement position, the plane spacing image between the object to be measured 26 is image-processed by the first and second CCD cameras 11 and 12 by the image processing unit 24 to the computer 25.

On the other hand, the plane spacing imaged by the computer 25 is a surface spacing between two boundary lines between the measurement object 26 appearing in the image as shown in FIG. 9 and a plurality of boundary line detection lines for each boundary line. While detecting the intersection of the detection line and the boundary line between the measurement target object 26 by using the detected intersection point as shown in FIG. 25) is calculated by the first and second CCD cameras 11 and 12, and the surface spacings A 'and B between the measured objects 27 are measured by the first and second CCD cameras 11 and 12. As shown in the figure, the difference A'- between the distance A 'measured by the first and second CCD cameras 11 and 12 and the distance B' measured by the second CCD camera 12 is shown. The balance is measured by B ').

As described above, the present invention is easy to measure and set the illumination state by automating the measurement of the spacing and balance of the two surfaces of the assembly having a small distance by using two cameras facing each other with coaxial lighting. And it is to be able to determine the optimum measurement position by the auto focus.

Claims (2)

First and second CCD cameras 11 and 12 for capturing an image of an object 26 to be measured by attaching a high magnification lens so as to face each other and integrated with coaxial lighting, and the first and second facing cameras The first and second barrels 13 and 14, which are integrated with the second CCD cameras 11 and 12 and have the first and second semi-transmissive mirrors 15 and 16 embedded therein, and the first and second First and second transflective mirrors 15 and 16, which are embedded in the second barrels 13 and 14 and transmit half and half of light, and the first and second barrels 13 And a first and second beam for transmitting an optical signal from the first and second halogen lamp light sources 19 and 20 while connecting the first and second halogen lamp light sources 19 and 20 to (14). First and second halogen lamp light sources 19 and 20 for outputting an optical signal through second optical fibers 17 and 18 and the first and second optical fibers 17 and 18. And the first and second transfer devices 21 and 22 connected to the first and second CCD cameras 11 and 12. A feed control unit 23 which is operated to move left and right at a predetermined speed, an image processing unit 24 which processes an image displayed by the first and second CCD cameras 11 and 12 and inputs it to the computer 25; An apparatus for measuring the distance and balance between objects to be measured, characterized in that it comprises a computer 25 for measuring the interval according to the input image to calculate the numerical value. A first process of initializing the surface spacing of the object to be measured 26 by applying illumination using coaxial illumination integrated with the first and second CCD cameras 11 and 12 facing each other after applying power to each part of the system; And a second process of transferring the first and second CCD cameras 11 and 12 to determine the optimum focal spacing between the objects to be measured 26, and a boundary line between the objects to be measured 26 as a result of the determination. The third process of detecting the boundary line by detecting the detection line and the intersection, and the surface between the measurement object 26 using the first and second CCD cameras 11, 12 by the recognized boundary line of the third process And a sixth process of measuring the balance and completing the balance by the difference between the plane intervals calculated by the first and second CCD cameras 11 and 12. How to measure the gap and balance between workpieces.