Method and device for investigating polarization film
A technology of inspection devices and inspection methods, applied in the direction of optical devices, measuring devices, optics, etc., can solve the problems of scars on the film surface, fluctuation inspection accuracy, low and other problems, and achieve the effect of high-precision defect detection
Inactive Publication Date: 2007-09-26
SUMITOMO CHEM CO LTD
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Problems solved by technology
[0009] However, in this method, once a small gap is created between the inspection substrate and the polarizing film, the vacuum adsorption will be completely released, and there will be a problem that the inspection accuracy will be lowered due to the shaking and fluctuation of the film.
Also, there is a problem of scarring the surface of the film by the sliding of the polarizing film and the inspection substrate
In addition, there is also a problem that it is difficult to change the width of the vacuum suction accompanying the change of the width of the polarizing film produced.
Method used
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Embodiment Construction
[0034] Embodiments of the present invention are described based on the drawings.
[0035] In FIG. 2 and FIG. 3 , the cross section of an example of a polarizing film with a laminated structure is enlarged, and a bubble defect to be inspected is modeled and shown. FIG. 2 shows an example of a polarizing film 1 having a five-layer structure including a protective film 13 , an adhesive layer 16 , a polarizer film 12 , an adhesive layer 16 , and a protective film 13 . In this film, the bubble defect of the polarizing film which becomes a defect of a display which is a final product is a, b, c, and d.
[0036] FIG. 3 shows an example of a polarizing film 1 having a three-layer structure including a polarizer film 12 , an adhesive layer 16 , and a protective film 13 . In this film, e and f are bubble defects detected.
[0037] A well-known polarizer film can be used as a polarizer film which is a constituent member of a polarizing film. Specifically, it is generally a film in whi...
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The present invention provides a method and equipment for detecting a defect, especially a bubble, of a polarization film of a multilayer structure moving continuously, with high accuracy without the effect of a waving phenomenon in the widthwise direction accompanying the movement of the film, vibration (fluttering) of the film during carriage, or the like. The inspection equipment having two sets of inspecting sections provided with a light source section and a detecting section disposed, respectively, on the surface side and the back side of the polarization film moving continuously, and a carry roll abutting / supporting the back side of the film is used. Ether one of the light source section and the light receiving section of the detecting section is provided with a polarization member having a transmission axis making cross Nicol with the absorption axis of the polarization film, and at the inspecting section, the polarization film supported by the carry roll while abutting is irradiated with light from the light source at the light source section and its reflected light is detected.
Description
technical field [0001] The present invention relates to a method and device for inspecting defects of a polarizing film, in particular inspecting the surface and interior of the polarizing film, that is, bubble defects existing on the lamination interface of the materials constituting the polarizing film. Background technique [0002] The polarizing film is attached to both sides of the liquid crystal element and used as a part of the liquid crystal display panel. FIG. 1 is a cross-sectional view showing an example of the structure of a liquid crystal display panel. The liquid crystal display panel 20 has a configuration in which a polarizing film 1 is bonded to both surfaces of a liquid crystal element 21 . [0003] Liquid crystal display has the advantages of miniaturization, thinning, and low power consumption, and is widely used in small video recorders, mobile phones, car navigation systems, computers, etc. [0004] The configuration of the polarizing film used in the...
Claims
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IPC IPC(8): G01N21/896G01B5/30G01B11/30G01N21/88G01N21/892G02B5/30G02F1/1335
CPCG01N21/21
Inventor 篠塚淳彦
Owner SUMITOMO CHEM CO LTD