KR100769326B1 - Polarizing film inspection device - Google Patents

Abstract

The present invention relates to a polarizing film inspection apparatus for obtaining a magnified image for each region of the polarizing film through transmitted light or reflected light for the polarizing film to detect defects through the image, and to automatically classify the polarizing film according to the result. will be.

The polarizing film inspection apparatus of the present invention for this purpose is a film holder for fixing the polarizing film transported through the conveying means at the inspection position, a surface light generator for irradiating the surface light to the polarizing film, and the light irradiated by the surface light generator A screen on which the image reflected or transmitted from the polarizing film is projected, image detection means for capturing the image projected on the screen, and detecting the image, image display means for displaying the image detected by the image detection means; And a film separating means for separating the polarizing film into a good product and a defective product, and a drive control means for controlling driving of the conveying means, the surface light generating device, the screen, the image detecting means, the image display means and the film separating means. And the surface light generating device and the screen are reflected light from the surface of the polarizing film. Each group is arranged inclined with respect to the polarizing film to make sure.

Description

Polarizing film inspection device {APPARATUS FOR INSPECTING POLARIZED FILM}

1 is a conceptual diagram of a polarizing film inspection device according to the present invention.

Figure 2 is a front perspective view showing the configuration of one embodiment of the polarizing film inspection device of Figure 1;

3 is an exploded perspective view showing an example of the surface light generating device of tank 1. FIG.

4 is an enlarged cross-sectional view of the main portion of FIG. 2;

5 is a block diagram showing the basic concept of the polarization film reflection test according to an embodiment of the present invention.

6 is a front perspective view showing the configuration of a polarizing film inspection apparatus according to another embodiment of the present invention.

Figure 7 is a block diagram showing the basic concept of the polarization film reflection test according to another embodiment of the present invention.

8 is a cross-sectional perspective view showing the structure of a general polarizing film.

9 is a configuration diagram showing a polarizing film defect inspection method of FIG.

<Description of the symbols for the main parts of the drawings>

1 film holder, 11 through hole

2: surface light generating device

    21: light source, 22: beam expansion lens, 23: objective lens

    24: pin hole mount, 241: pin hole

    25: beam guide

3: screen

4: image detection means

    41: CCD camera, 42: frame grabber

5: image display means

    51: computer, 52: LCD monitor, 53: warning light

6: film separation means

    61: film unloader, 62: regular product tray, 63: defective product tray

    64: manual operation means

7: drive control means

8: feeding tray

9: polarizing film

The present invention relates to a polarizing film inspection apparatus, and more particularly, to obtain an enlarged image for each area of the polarizing film through the transmitted light or reflected light for the polarizing film to detect whether there is a defect through the image, and according to the result It relates to a polarizing film inspection device for automatically sorting.

In general, as a method of determining the amount / fire by inspecting the surface of the polarizing film, after irradiating light with a lamp to the polarizing film, a hazard is identified by the naked eye to determine the amount / fire.

In the method for visually inspecting the polarizing film, first, the light is emitted by using a light source provided on one side, and the emitted light is irradiated onto the surface of the polarizing film, and then the operator uses the light reflected from the polarizing film. This is to visually check for bubbles, foreign matters, foreign matters, and bending during handling.

FIG. 8 is a cross-sectional perspective view illustrating a structure of a general polarizing film, wherein the polarizing film is a release liner (110) adhesive 120, a support (Tri-acetyl-cellulose, TAC: 130) as shown in FIG. , PVA (Poly Vinyl Alcohol: 140) protective film 150 and the like is laminated structure.

9 is a configuration diagram illustrating a polarizing film defect inspection method of FIG. 8.

Referring to the drawings, in order to inspect the defects of the polarizing film, as shown in the drawing, after installing a general light source 210 in the form of a fluorescent lamp or a halogen lamp, that is, a bar (Bar) at a predetermined position, the polarizing film 220 The state of the polarizing film is visually confirmed while changing the position to have a reflection and transmission angle with respect to the light source 210.

In the case of using the method of visually inspecting the polarizing film, it takes about 1 minute to inspect the 19 ″ polarizing film.

By the way, as described above, the inspection method for visual identification of the worker has a problem in that the accuracy of the inspection is lowered due to the fact that a foreign material or a scratch of a minute size cannot be found for a specific film, and thus the reliability of the inspection cannot be maintained constantly. .

In addition, the fatigue of the operator accumulates due to the repeated inspection work, thereby reducing the reliability of the inspection, there is a disadvantage that the inspection amount does not meet the market demand due to the decrease in the inspection efficiency.

An object of the present invention for solving the problems according to the prior art is to transmit or reflect the surface light source having excellent coherence to the polarizing film to induce the enlarged image generated at the defect site on the screen, and the image induced on the screen Shoot using the area camera and display the captured image so that the operator can input the classification signal after visual confirmation, or use the image processing algorithm to automatically determine whether there is a defect in the polarizing film and output the classification signal. In order to automatically classify a polarizing film according to a signal, to provide a polarizing film inspection apparatus that enables automatic inspection for the polarizing film.

The polarizing film inspection device of the present invention for solving the above technical problem, a film holder for fixing the polarizing film conveyed through the conveying means at the inspection position, a surface light generating device for irradiating the surface light to the polarizing film, and the surface light generating device Displays a screen on which the image reflected or transmitted from the polarizing film by the light irradiated by the projection is projected, image detecting means for capturing the image projected on the screen, and detecting the image, and the image detected by the image detecting means Drive for controlling the driving of the image display means, the film separation means for separating the polarizing film into a good product and a defective product, the transfer means, the surface light generating device, the screen, the image detection means, the image display means and the film separation means. And a control means, wherein the surface light generating device and the screen have a surface of the polarizing film. Each group is arranged inclined with respect to the polarizing film to ensure that the light reflected by the projection.

The film holder of the polarizing film inspection apparatus of the present invention is provided to be movable in the X direction and the Y direction by a motor drive.

The film separating means of the polarizing film inspection device of the present invention is a defective product tray and a fixed product tray for loading defective products and regular goods after the completion of the inspection, and the defective product in accordance with the control signal output from the drive control means It consists of a film unloader which is transferred to a tray or a regular tray.

In this case, the film separation means may further include a manual operation means for receiving a signal according to the manual operation of the operator, or to store the reference image data for the normal polarizing film and receives the image data detected by the image detection means to receive an image defect The method may further include a computer configured to determine whether the corresponding polarizing film is defective by using a detection algorithm, and output the result to the driving control means.

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The invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through embodiments of the present invention.

1 is a conceptual diagram of a polarizing film inspection apparatus according to the present invention, Figure 2 is a front perspective view showing the configuration of an embodiment of the polarizing film inspection apparatus of Figure 1, the polarizing film inspection apparatus according to an embodiment of the present invention is a polarizing film By using the reflected light from the surface, the film holder 1, the surface light generating device 2 and the screen 3, the image detecting means 4, the image displaying means 5, the film separating means 6 and The drive control means 7 is comprised.

Referring to the drawings, first, the polarizing film 9 to be inspected is loaded on the feeding tray 8 of about 200 to 300 sheets.

The film holder 1 fixes the polarizing film 9 conveyed by a conveying means, that is, a film loader, at an inspection position, and is made of a vacuum chuck or an electrostatic chuck.

In this case, the film holder 1 is not shown in the drawing to enable movement in the X direction or the Y direction when photographing by dividing the polarizing film 9 into multiple, preferably provided with a moving means.

The surface light generating device 2 is to make it easy to detect defects of the polarizing film by using the reflected light reflected from the polarizing film by irradiating the coherent surface light on the polarizing film 9, as shown in FIG. 3. The laser light source 21 for generating light having excellent interference characteristics as described above, the beam extension lens 22 for expanding the diameter of the laser beam emitted from the laser light source 21 and emitting it, and from the beam extension lens 22. The objective lens 23 for separating the luminous flux from the emitted laser beam and increasing the divergence angle, and the diffraction of the laser beam by removing the stain and scattering by the dust or foreign matter on the surface of the objective lens 23 or the exit window of the laser beam. The pinhole mount 24 on which the pinhole 241 is formed to smooth the interference fringes by the cutout, and cuts only the required area of the laser beam that has passed through the pinhole 241 or uses the laser beam. It is achieved, including the beam guide (25) for.

When the distance between the surface light generating device 2 and the polarizing film 9 fixed by the polarization holder 1 approaches, the image projected on the screen 3 increases in magnification but decreases in the area of irradiation of surface light. On the contrary, when the distance between the surface light generating device 2 and the polarizing film 9 increases, the irradiation area of the surface light becomes large, but the enlargement ratio becomes small, so that it is appropriately adjusted in the range of 10 to 40 cm.

The screen 3 is provided such that an image reflected from the polarizing film 9 is projected after the reflected light irradiated by the surface light generating device 2 is irradiated onto the polarizing film 9. It is possible to adjust the angle with respect to).

In one embodiment of the present invention, the surface light generating device 2 and the screen 3 are adapted to irradiate the reflected light to the surface of the polarizing film 9 and to reflect the reflected light from the surface of the polarizing film 9. As shown in Fig. 4, the polarizing films 9 should be disposed to be inclined respectively.

At this time, when the placement angle of the surface light generating device 2 and the screen 3 is small with respect to the polarizing film 9 placed at the inspection position, the brightness of the reflected image is bright while the waves unique to the polarizing film 9 are generated. Morphology appears, and the larger the placement angle, the smaller the wave shape, while the darker the brightness, the better the angle in the range of 30 to 60 °.

The image detecting means 4 detects an image by capturing an image projected on the screen 3, a CCD camera 41 for capturing an image projected on the screen 3, and the CCD camera ( And a frame grabber 42 for converting and outputting an analog video signal photographed through 41 into a digital signal that can be processed by a computer 51 described later.

The image display means 5 processes the data output from the frame grabber 42 of the image detection means 4 and displays it visually and identifiably, and comprises a computer 51 and an LCD monitor 52. do.

Here, the warning light 53 is an alarm for warning the worker when a failure occurs or the machine operation abnormality.

The film separating means 6 separates the inspected polarizing film 9 into a regular product and a defective product, and the regular product tray 62, the defective product tray 63, and the polarizing film 9 are fixed to the regular product. It is composed of a film unloader 61 for classifying and conveying to the tray 62 or the defective tray 63.

The drive control means 7 controls the drive of the surface light generating device 2, the screen 3, the image detection means 4, the image display means 5 and the film separation means 6. It consists of a PLC (Power Line Communication) to be synchronized by the computer 51, and communicates through the RS-232C for the synchronization processing function between the PLC and the computer (51).

On the other hand, each part is provided with a position sensor, respectively.

In one embodiment of the present invention, the film separation means 6 may further include a manual operation means 64 for allowing an operator to manually operate a classification operation signal for the polarization film 9 on which the inspection is completed. have.

That is, the operator who visually checks the screen provided through the LCD monitor 52 can operate the manual operation means 64, so that the drive control means 7 generates a drive signal according to the manual operation signal of the operator. It can output and classify a polarizing film.

Alternatively, the computer 51 stores reference image data for the normal polarizing film, receives the image data detected by the image detecting means 4, and determines whether the polarizing film is defective by using an image defect detection algorithm. And outputs the result to the drive control means 7.

Accordingly, the polarizing film is automatically classified according to the output signal of the drive control means 7.

When using the reflection inspection apparatus according to an embodiment of the present invention, it is possible to magnify and observe defects such as crushing, stamping, sliding, etc. generated in the surface light irradiation area of the polarizing film.

The inspection method using the polarizing film inspection apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 as follows.

First, the polarizing film 9 loaded on the feeding tray 8 is transferred to the film holder 1 to be fixed to the film holder 1, and then the position of the film holder 1 is adjusted in the X and Y directions. The film holder 1 is placed at the inspection position.

The position and angle of the surface light generating device 2, the screen 3, and the CCD camera 41 are adjusted based on the polarizing film 9 to obtain desired reflected light from the polarizing film 9.

5 is a block diagram illustrating a basic concept of a polarization film reflection test according to an embodiment of the present invention. Referring to the drawings, surface light is generated based on the polarization film 9 to obtain reflected light from the surface of the polarization film 9. The device 2 and the screen 3 are each configured to have a predetermined angle of inclination, so as to properly adjust the placement angle in the range of 30 to 60 °.

Subsequently, the surface light generator 2 is oscillated to irradiate surface light onto the surface of the polarizing film 9 so that the reflected light from the surface of the polarizing film 9 is projected onto the screen 3, and the screen 3 The image projected on the image is captured by the CCD camera 41.

Then, the image photographed by the CCD camera 41 is detected through the frame grabber 42 and input to the computer 51.

The image input to the computer 51 is image processed and displayed on the LCD monitor 52.

In this case, the classification of the polarizing film according to the detected image is to visually check the image displayed on the LCD monitor 52 by the operator, and according to the result, the administrator operates the manual operation means 64 to classify the polarizing film. Alternatively, the polarizing film may be automatically classified according to a driving signal of the computer 51 that determines whether the corresponding polarizing film is defective by using an image defect detection algorithm on the acquired image.

On the other hand, the operation signal by the operator or the drive signal of the computer synchronizes the drive control means 7, and outputs a drive signal from the drive control means 7 to the film unloader 61 in accordance with the synchronization signal. Thus, the feeder (not shown) provided in the film unloader 71 classifies and transfers the polarizing film to the regular product tray 62 or the defective product tray 63.

As described above, according to the exemplary embodiment of the present invention, the polarizing film is automatically transferred to the inspection position, the polarizing film is irradiated with good coherent surface light, and the reflected light reflected from the polarizing film is projected onto the screen to capture the projected image. And the analysis is displayed easily to the operator's naked eye, and the polarizing film is automatically classified by manual operation of the confirmed operator, or the image defect detection algorithm is used to automatically determine whether the detected image is defective and Accordingly, the polarizing film is automatically classified, thereby improving work efficiency and reliability.

6 is a front perspective view showing the configuration of a polarizing film inspection apparatus according to another embodiment of the present invention, the polarizing film inspection apparatus according to another embodiment of the present invention uses the light transmitted through the polarizing film, the film holder (1) ), The surface light generating device 2 and the screen 3, the image detection means 4, the image display means 5, the film separation means 6, and the drive control means 7. The same configuration as that of the first embodiment of the present invention and a detailed description thereof will be omitted.

7 is a block diagram illustrating a basic concept of a polarization film reflection test according to another embodiment of the present invention. Referring to FIGS. 6 and 7, the surface light generating device 2, the polarizing film 9, and the screen 3 are illustrated in FIG. ) Is arranged on a coaxial line, the surface light generated by the surface light generating device 2 is transmitted to the screen 3 through the polarizing film 9, and thus the image projected on the screen (3) CCD camera By photographing using (41) and analyzing it, defects occurring in the polarizing film 9 are detected.

When performing a transmission test according to another embodiment of the present invention, it is possible to enlarge and observe defects such as foreign matter and bubbles generated in the surface light irradiation area of the polarizing film.

At this time, it is important that the film holder 1 is a polarizing film 9 so that the light irradiated from the surface light generating device 2 disposed coaxially with the polarizing film 9 can pass through the polarizing film 9. As shown in FIG. 6, the through hole 11 is preferably formed to fix only the edge of each side and expose the inspection area.

When the distance between the surface light generating device 2 and the polarizing film 9 fixed by the polarization holder 1 approaches, the image projected on the screen 3 increases in magnification but decreases in the area of irradiation of surface light. On the contrary, when the distance between the surface light generating device 2 and the polarizing film 9 increases, the irradiation area of the surface light becomes large, but the enlargement ratio becomes small, so that it is appropriately adjusted in the range of 10 to 40 cm.

The inspection method using the polarizing film inspection apparatus according to another embodiment of the present invention will be described with reference to FIGS. 1, 6, and 7 as follows.

First, the polarizing film 9 loaded on the feeding tray 8 is transferred to the film holder 1 and fixed to the film holder 1, and then the position of the film holder 1 is adjusted in the X and Y directions. The inspection position is set to be arranged coaxially with respect to the surface light generating device 2 and the screen 3.

Subsequently, the surface light generator 2 is oscillated to irradiate the surface light passing through the polarizing film 9 so that the transmitted light transmitted through the polarizing film 9 is projected onto the screen 3, and the screen 3 Is taken by the CCD camera 41.

Then, the image photographed by the CCD camera 41 is detected through the frame grabber 42 and input to the computer 51.

The image input to the computer 51 is image processed and displayed on the LCD monitor 52.

At this time, the classification of the polarizing film according to the detected image is achieved by a driving signal for outputting after detecting a defect automatically in the manual operation of the operator or inside the computer as in one embodiment of the present invention.

As described above, according to another embodiment of the present invention, the polarized film is automatically transferred to the inspection position, the polarized film is irradiated with coherent surface light, and the transmitted light passing through the polarized film is projected onto the screen to capture the projected image. And the analysis is displayed easily to the operator's naked eye, and the polarizing film is automatically classified by manual operation of the confirmed operator, or the image defect detection algorithm is used to automatically determine whether the detected image is defective and Accordingly, the polarizing film is automatically classified, thereby improving work efficiency and reliability.

As described above, the present invention transmits or reflects a surface light source having excellent coherence to the polarizing film to induce an image in which the polarizing film is enlarged for each region on the screen, and photographs the image induced on the screen using an area camera. Display the captured image to allow the operator to input the classification signal after visual confirmation, or automatically determine whether the polarization film is defective by using an image processing algorithm to output the classification signal, and automatically output the polarization film according to the classification signal. By classifying, automatic inspection and classification of the polarizing film is made.

As a result, the accuracy of the polarizing film inspection is improved to improve the inspection reliability, and to facilitate the determination of the defect by the manager, thereby improving the inspection efficiency and thus improving the productivity.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many different and obvious modifications are possible without departing from the scope of the invention from this description. Therefore, the scope of the invention should be construed by the claims described to include many such variations.

Claims (10)

A film holder (1) for fixing the polarizing film (9) conveyed through the conveying means to an inspection position, A surface light generator 2 for irradiating surface light onto the polarizing film 9; A screen 3 on which an image reflected or transmitted from the polarizing film 9 is projected by the light irradiated by the surface light generating device 2, Image detecting means (4) for detecting an image by taking an image projected on the screen (3); Image display means (5) for displaying an image detected by the image detection means (4), Film separation means (6) for separating the polarizing film (9) into a good product and a defective product, and And a drive control means (7) for controlling the driving means, the surface light generating device (2), the screen (3), the image detection means (4), and the image display means (5) and the film separation means (6). Composed of, The surface light generating device (2) and the screen (3); Polarizing film inspection apparatus, characterized in that arranged to be inclined with respect to the polarizing film (9) in order to irradiate the reflected light on the surface of the polarizing film (9) and to reflect the reflected light from the surface of the polarizing film (9). The method of claim 1, The film holder (1) is a polarizing film inspection device, characterized in that the motor is provided to be movable in the X direction and the Y direction. The method of claim 1, The film separation means 6, After the inspection is completed, the regular product tray 62 and the defective product tray 63 for loading the tray, Polarized light, characterized in that consisting of a film unloader 61 for conveying the polarizing film 9 to the regular product tray 62 or the defective product tray 63 according to the control signal output from the drive control means (7). Film inspection device. The method of claim 3, wherein Said film separating means (6); Polarizing film inspection apparatus, characterized in that it further comprises a manual operation means (64) to receive a signal according to the manual operation of the operator. The method of claim 3, wherein The film separation means 6, Storing reference image data for the normal polarizing film, receiving the image data detected by the image detecting means 4, and determining whether the corresponding polarizing film is defective by using an image defect detection algorithm. And a computer (51) for outputting to 7). delete delete delete delete delete

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