KR102130837B1 - Digital projector Inspection System and its inspection method - Google Patents

Abstract

The present invention is a digital camera that is located directly above the measurement object to take the measurement object and digitize the optical image and transmit it to a computer connected by wire or wirelessly; An optical zoom lens connected to the digital camera to observe the measurement object at various magnifications from low magnification to high magnification; A ring light connected to the digital camera and irradiated to the measurement object from the top; An autofocus device connected to the digital camera to automatically and automatically focus the measurement object even at high magnification; A backlight irradiated to the measurement object from the bottom to increase the measurement accuracy of the boundary of the measurement object; A Z-stage for vertically moving the optical system including the digital camera, the optical zoom lens, and ring illumination in the Z axis; And an XY stage having a transparent glass in which the measurement object is positioned at the center of the upper surface and transmitting the backlight illumination, and moving the measurement object in the X-axis or Y-axis and recognizing the position information. It's about how.
The present invention can improve the shortcomings of the existing projector and measurement microscope and non-contact AOI (Automated Optical Inspection) to quickly verify the presence or absence of defects in the product processing state, and furthermore, to accurately measure, and measure various precisions. It has the effect of making the mold inspection quick and accurate, and avoiding delays in the preparation process and errors in the inspection process.

Description

Digital projector inspection system and its inspection method

The present invention relates to a digital projector inspector and an inspection method using the same, and more specifically, to improve the shortcomings of the existing projector, measurement microscope, and non-contact AOI (Automated Optical Inspection), visually inspect the presence or absence of defects in product processing status It relates to a digital projector inspector that can proceed only and can be accurately measured, and an inspection method using the same.

In general, smartphones and electrical/electronic components are diversified, refined, and miniaturized by consumer demands, while product life cycles are becoming shorter.

In order to meet these requirements, the quality of precision molds that produce parts must be prioritized.

Therefore, the precision mold manufacturing process is also important, but the quality of the mold must be guaranteed using a quality measurement environment or equipment after production.

Projectors (projectors), measurement microscopes, non-contact automated optical inspection (AOI), and micrometers are widely used to measure such precision molds.

Conventional projectors (or projectors) project optical images onto the screen, print CAD drawings, and superimpose on the projected images for observation/measurement. Such digital projectors transmit and transmit optical images to computers using digital cameras. It is a device that can observe and automatically measure the digital image.

It is a device that quickly and accurately observes and automatically measures CAD drawings that are stored as files and outputs them overlaid on digital images.

However, due to the market characteristics of electrical/electronic parts, the rate of production of small quantities of multi-species of precision molds is very high. There was this very falling issue.

(1) Republic of Korea Patent Registration No. 10-0174940

The present invention is to solve the problems as described above, by improving the disadvantages of the conventional projector (projector) and measurement microscope, non-contact AOI (Automated Optical Inspection) can quickly proceed to the verification of the presence or absence of defects in the product processing state The objective is to provide a digital projector inspector capable of accurately measuring and an inspection method using the same.

In addition, there is another object to provide a digital projector tester and an inspection method using the same, so that various precision mold inspections can be performed quickly and accurately, and a time delay in an inspection preparation process and an error in the inspection are not generated.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the digital projector tester of the present invention includes a digital camera which is located directly above the measurement object, takes a measurement object, digitizes an optical image, and transmits it to a computer connected by wire or wirelessly;

An optical zoom lens connected to the digital camera to observe the measurement object at various magnifications from low magnification to high magnification;

A ring light connected to the digital camera and irradiated to the measurement object from the top;

An autofocus device connected to the digital camera to automatically and automatically focus the measurement object even at high magnification;

A backlight irradiated to the measurement object from the bottom to increase the measurement accuracy of the boundary of the measurement object;

A Z-stage for vertically moving the optical system including the digital camera, the optical zoom lens, and ring illumination in the Z axis; And

The object to be measured is located at the center of the upper surface, and has a transparent glass that transmits the backlight illumination, and has an XY stage that moves the object to be measured in the X-axis or Y-axis and recognizes the position information.

In addition, the computer, the video window to enlarge the observation in real time video;

A superimposed output window that superimposes and outputs the real image of the measurement object received from the digital camera and the design information (CAD) of the measurement object previously produced and stored therein to the video window;

A CAD original viewing window showing design information (CAD) of a measurement object which is pre-made and stored inside adjacent to the video window;

An inspected area window which is adjacent to the video window and the original view window of the CAD and shows the inspected area and defective information as a whole in the overlapped output window; And

In addition to the video window and the original view window of the CAD and the inspected area window, a stage coordinate window showing the current position of the measurement object in XY coordinates.

In addition, the inspection method using the digital projector tester of the present invention, the measurement object positioning step of positioning the measurement object on the XY stage transparent glass top of the digital projector tester;

A design information activation step of driving a computer to activate design information (CAD) of the measurement object;

A program window activation step of activating a computer defect inspection program window;

A design information floating step of selecting and displaying design information (CAD) of a measurement object provided from a digital camera in a CAD original view window of the defect inspection program window;

An alignment object selection step of selecting an alignment object from the measurement object design information (CAD) of the defect inspection program window CAD source view window;

An XY stage moving step of moving the XY stage of the digital projector checker so that the area of the measurement object corresponding to the object selected in the alignment object selection step coincides with the center crosshair where the X and Y axes of the video window meet;

A shape automatic detection step of automatically detecting a shape of a measurement object near a central cross line where the X and Y axes meet based on the selected measurement object design information (CAD);

A shape analysis step of numerically analyzing in a video window in a circle, arc, or linear shape based on the shape of the selected measurement object design information (CAD);

A measurement object analysis step of setting the datum reference object through the shape analysis step and analyzing rotation information and movement information of the measurement object using the datum object when there are two datum objects;

A return step of setting as a datum reference object through the shape analysis step and returning to the sorting object selection step when there are not two datum objects;

A superimposed output step of superimposing and outputting design information (CAD) on the video window using the analyzed information;

If the distance or angle between the design information (CAD) and the shape of the object to be superimposed after the superimposed output step is greater than or equal to the specified value, a warning is displayed through the superimposed output window, a warning message is output, and the area of the anomaly and the measured value are output on the video window. Warning and message output steps; And

Including the artificial intelligence screen inspection step in real time based on the artificial intelligence (Deep Learning) inspection of scratches, including surface defects or defect patterns of the measurement object shape based on the design information shown in the video window (CAD) There is a characteristic.

As described above, the present invention can improve the shortcomings of the existing projectors and measuring microscopes, and non-contact AOIs (Automated Optical Inspection) to quickly and accurately verify the presence or absence of defects in the product processing state, and furthermore, to accurately measure the It has the effect of ensuring that various precision mold inspections are made quickly and accurately, and that there is no delay in the preparation process and errors in the inspection process.

The present invention is not limited to the specific preferred embodiments described above, and various modifications can be implemented by anyone who has ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, such changes are within the scope of the claims.

1 is an explanatory view showing a front view and a side view of a digital projector tester according to an embodiment of the present invention;
2 is an explanatory view showing a state of a computer defect inspection program window implemented through a digital projector inspection system according to an embodiment of the present invention;
Figure 3 is a flow chart showing an inspection method using a digital projector tester that is an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.

In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are attached to the same or similar elements throughout the specification. The scope of rights of the present invention should not be construed as being limited by the embodiments described in the text, and since the embodiments can be modified in various ways and have various forms, the scope of rights of the present invention can realize technical ideas. It should be understood to include equivalents.

Throughout the specification of the present invention, when it is said that a part is "connected" to another part, this includes not only the case where it is "directly connected", but also "indirectly connected" with another member interposed therebetween. In addition, when a part is said to "include" a certain component, this means that other components may be further included instead of excluding other components, unless otherwise stated.

Terms used in the present invention are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator, so definitions of these terms are consistent with the technical matters of the present invention. And should be interpreted as a concept.

And, the optional terms in the embodiments below are used to distinguish one component from another component, and the component is not limited by the terms. Hereinafter, in describing the present invention, detailed descriptions of related well-known technologies that may unnecessarily obscure the subject matter of the present invention are omitted.

The digital projector inspector A of the present invention includes a digital camera 100, an optical zoom lens 200, a ring illumination 300, an autofocus device 400, a backlight 500, and a Z stage ( 10) and XY stage (30).

The digital camera 100 is located directly above the measurement object 1, takes the measurement object 1, digitizes the optical image and transmits it to the computer 2 connected by wire or wirelessly.

The optical zoom lens 200 is connected to the digital camera 100 and observes the measurement object 1 at various magnifications from low magnification to high magnification.

The ring lighting 300 is connected to the digital camera 100 and irradiated to the measurement object 1 from the top.

The autofocus device 400 is connected to the digital camera 100 to automatically and automatically focus the measurement object 1 even at high magnification.

The backlight 500 is irradiated to the measurement object 1 from the bottom to increase the measurement accuracy of the boundary of the measurement object 1.

The Z stage 10 moves the entire optical system including the digital camera 100, the optical zoom lens 200, and the ring illumination 300 vertically along the Z axis.

The XY stage 30 has the transparent glass 20 through which the measurement object 1 is positioned at the center of the upper surface and transmits the backlight 500 illumination, and moves the measurement object 1 in the X axis or Y axis. And recognize the location information.

The computer 2 includes a video window S100 that is enlarged and observed with real-time video, a real image of the measurement object 1 received from the digital camera 100, and a measurement object 1 that has been previously produced and stored therein. Overlapping output window (S200) for superimposing and outputting design information (CAD) to the video window (S100), and design of the measurement object (1) that is pre-made and stored inside and adjacent to the video window (S100) The CAD original viewing window (S300) showing the information (CAD) and the video window (S100) and the CAD original viewing window (S300) are adjacent to each other, and the area inspected in the overlapping output window (S200) and defect information as a whole. Stage coordinate window showing the current position of the measurement object 1 in XY coordinates separately from the inspected area window S400, the video window S100, the CAD original view window S300, and the inspected area window S400. A defect inspection program window 3 including (S500) is provided.

In addition, the inspection method using the digital projector tester of the present invention, the measurement object positioning step (a), the design information activation step (b), the program window activation step (c), the design information floating step (d) and , Alignment object selection step (e), XY stage moving step (f), shape automatic detection step (g), shape analysis step (h), measurement object analysis step (i), warning and message output step (l) and artificial intelligence screen inspection step (m).

The measurement object positioning step (a) is a step of positioning the measurement object 1 on the XY stage 30 transparent glass 20 of the digital projector inspector A.

The design information activation step (b) is a step of activating the design information (CAD) of the measurement object 1 by driving the computer 2.

The program window activation step (c) is a step of activating the defect inspection program window 3 of the computer 2.

In the design information floating step (d), the design information (CAD) of the measurement object 1 provided from the digital camera 100 is selected and floated in the CAD original view window S300 of the defect inspection program window 3. to be.

The alignment object selection step (e) is a step of selecting an alignment object from the measurement object (1) design information (CAD) of the defect inspection program window (3) CAD original view window (S300).

In the XY stage moving step (f), the digital projector checker so that the area of the measurement object 1 corresponding to the object selected in the alignment object selection step coincides with the central cross line where the X and Y axes of the video window S100 meet. This is a step of moving the XY stage 30 of (A).

The automatic shape detection step (g) is a step of automatically detecting the shape of the measurement object 1 near the center cross line where the X and Y axes meet based on the selected measurement object 1 design information (CAD).

The shape analysis step (h) is a step of numerically analyzing in a circle, arc, and linear shape in the video window S100 based on the shape of the selected measurement object 1 design information CAD.

The measurement object analysis step (i) is a step of setting a datum reference object through the shape analysis step and analyzing rotation information and movement information of the measurement object using a datum object when there are two datum objects.

A return step (j) of setting the datum reference object through the shape analysis step and returning to the sort object selection step when there are not two datum objects;

A superimposed output step (k) of superimposing and outputting design information (CAD) on the video window (S100) using the analyzed information;

In the warning and message output step (l), after the overlapping output step, if the distance or angle between the design information (CAD) and the overlapped measurement object (1) shape is greater than the specified value, the warning is displayed through the overlapping output window (S200). This is the step of outputting the caution message and outputting the abnormal area and the measured value to the video window (S100).

In the artificial intelligence screen inspection step (m), inspection of scratches including surface defects or defective patterns of the object to be measured (1) based on design information (CAD) shown in the video window (S100) is performed by artificial intelligence ( Deep Learning).

In the present invention, the inspector places the measurement object 1 on the upper surface of the transparent glass 20 of the digital projector inspector A, activates the design information CAD of the computer 2, and then performs a defect inspection program window ( 3) Activate to display design information (CAD) in the CAD original view window (S300).

Then, when an alignment object is selected in the CAD source view window (S300), the XY stage 30 moves to the area corresponding to the selected object, and the operator in the video window (S100) moves the area to the center crosshair of the screen. When moved to reach, the defect inspection program automatically detects the shape near the center crosshair and analyzes it as a circle, arc, line shape based on the shape of the selected design information (CAD) object, and sets it as a datum reference object.

If the set datum reference object is not two, the process is restored to the step of selecting the alignment object again in the CAD source view window (S300), and if the set datum reference object is two, rotation of the measurement object 1 using the datum reference object The information and movement information are analyzed, and design information (CAD) is superimposed on the video window (S100) using the analyzed information.

In this state, the surrounding edges are searched based on the design information (CAD) displayed on the screen of the video window (S100), and if the distance or angle between the design information (CAD) and the edge is greater than the specified value, the user is warned through the screen. , Outputs a caution message, and outputs the area of the abnormal region and the measured value in the video window (S100).

And, in order to leave the inspection data, the user presses the enter key of the keyboard or a button provided separately and leaves the information in the inspected area window S400.

Based on the design information (CAD) shown on the screen of the video window (S100), in the real-time inspection of scratches (surface defects), scratches, etc. of the shape of the surrounding edge, it is implemented based on deep learning, and the user Needless to say, additionally, a bad pattern (shape) may be added.

The drawings attached to the present embodiment and the present specification merely show a part of the technical spirit included in the present invention, and can be easily inferred by those skilled in the art within the scope of the technical spirit included in the specification and the drawings of the present invention. It is apparent that all possible modifications and specific examples are included in the scope of the technical spirit of the present invention.

The scope of the present invention is indicated by the following claims rather than the detailed description, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present invention.

A: Digital projector checker
a: Precise step of measurement object
b: Design information activation stage
c: Program window activation step
d: design information float
e: Sort object selection step
f: XY stage moving stage
g: Automatic shape detection step
h: Shape analysis step
i: Analysis of the measurement object
j: return step
k: Overlapping output stage
l: Warning and message output stage
m: AI screen inspection step
1: Object to be measured
2: Computer
3: Poor inspection program window
10: Z stage
20: transparent glass
30: XY stage
100: digital camera
200: zoom lens
300: ring lighting
400: autofocus device
500: backlight
S100: Video window
S200: Overlay output window
S300: CAD original view window
S400: inspected area window
S500: Stage coordinate window

Claims (3)

delete delete A measurement object positioning step of positioning the measurement object 1 on the XY stage 30 of the digital projector inspector A on the transparent glass 20;
A design information activation step of driving the computer 2 to activate the design information CAD of the measurement object 1;
A program window activation step of activating the defect inspection program window 3 of the computer 2;
A design information floating step of selecting and displaying design information (CAD) of the measurement object 1 provided from the digital camera 100 in the CAD original viewing window S300 of the defect inspection program window 3;
An alignment object selection step of selecting an alignment object from the object to be measured (1) design information (CAD) of the defect inspection program window (3) CAD source view window (S300);
The XY stage 30 of the digital projector inspector A is aligned so that the area of the measurement object 1 corresponding to the object selected in the alignment object selection step coincides with the center crosshair where the X and Y axes of the video window S100 meet. Moving the XY stage to move;
A shape automatic detection step of automatically detecting the shape of the measurement object 1 near the central cross line where the X and Y axes meet based on the selected measurement object 1 design information (CAD);
A shape analysis step of numerically analyzing in the video window S100 based on the shape of the selected measurement object 1 design information (CAD) in a circle, arc, or linear form;
A measurement object analysis step of setting a datum reference object through the shape analysis step and analyzing rotation information and movement information of the measurement object using a datum object when there are two datum objects;
A return step of setting as a datum reference object through the shape analysis step and returning to the sorting object selection step when there are not two datum objects;
A superimposed output step of superimposing and outputting design information (CAD) on the video window (S100) using the analyzed information;
If the distance or angle between the design information (CAD) and the overlapped measurement object (1) shape after the overlay output step is greater than or equal to the specified value, a warning is output through the overlay output window (S200), a warning message is output, and a video window (S100) is displayed. A warning and message output step of outputting an abnormal region and a measured value; And
Artificial intelligence based on the design information (CAD) shown in the video window (S100), the inspection of scratches, including surface defects or defect patterns of the measurement object (1), is performed in real time based on artificial intelligence (Deep Learning) Screen inspection step; inspection method using a digital projector tester comprising a.

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