CN1461948A - Method and device for investigating polarization film - Google Patents
Method and device for investigating polarization film Download PDFInfo
- Publication number
- CN1461948A CN1461948A CN03138326A CN03138326A CN1461948A CN 1461948 A CN1461948 A CN 1461948A CN 03138326 A CN03138326 A CN 03138326A CN 03138326 A CN03138326 A CN 03138326A CN 1461948 A CN1461948 A CN 1461948A
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- light source
- film
- polarizing film
- light
- inspection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
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
The present invention particularly checks surface and its inside, the i.e. air blister defect that exists of light polarizing film about a kind of method and device of checking the defective of light polarizing film on the stacked interface of light polarizing film constituent material.
Background technology
Light polarizing film attaches on the two sides of liquid crystal cell and uses, and is used as the part of display panels.Figure 1 shows that the sectional drawing of 1 example of the formation of display panels.Display panels 20 has the formation that light polarizing film of making 1 is fitted in the two sides of liquid crystal cell 21.
Liquid crystal display has can miniaturization, slimming, and the little advantage of power consumption simultaneously is widely used in small-sized video recorder, mobile phone, car steering guidance system, computing machine etc.
The formation of employed light polarizing film has nothing in common with each other according to purposes in the manufacturing that this display panels is used, and for example can be adhesive phase and stacked thereon the lit-par-lit structure of diaphragm are set on the single face of polariscope film itself or two sides.
This light polarizing film is in case on its surface and inner; be that polariscope film, adhesive phase, diaphragm constituent material inside, stacked interface exist bubble; will cause defective, image quality low of image, so be necessary to check such defective in the fabrication phase of light polarizing film.
As the inspection method of the bubble of checking light polarizing film, on the face of light polarizing film to this film along the angle of inclination irradiates light and observe irradiates light on method that its reflected light checks, the face and be well-known from the inspection method that opposing face is observed the light that sees through this film in light polarizing film.
But irradiates light and observe to see through the method that the light of this film is checked, the bubble that exists more detection not go out on a face of light polarizing film from opposing face.And, checking on the position, must light source portion be set at the single face of light polarizing film, and test section be set at its opposing face.So, form the free state of a kind of film therebetween, produce the wave phenomenon, the vibration in the conveyance (rocking) of Width etc., make the precision of image of inspection portion low.Particularly the image quality of LCD improves in recent years, can form bright distinct image.So originally unquestioned little defective also is used as the defective of display.In addition, be so-calledly to have nuclei air bubble to differentiate easily though this method makes bubble around foreign matter and its, have and be difficult to check out that the bubble of not following foreign matter is the problem of so-called no nuclei air bubble.Therefore, need to check out little accuracy of defect in the inspection of light polarizing film, above-mentioned inspection method can not adapt to these requirements.
Relative therewith, on a face of light polarizing film to this film along the angle of inclination irradiates light and observe the method that its reflected light is checked, make no nuclei air bubble by brightness with different former thereby can check out clearly on every side, and in the inspection part of continuously manufactured light polarizing film, a plurality of holes are set as checking substrate on tabular body, slidably attract from inner face, and can suppress rocking, fluctuating of film, improve and check precision.
But this method, in case checking the small gap of generation between substrate and light polarizing film, vacuum suction will be removed comprehensively, generation rocking, fluctuating of film occur and makes the low problem of precision of checking.And there is the problem of causing scar for the film surface in the slip by light polarizing film and inspection substrate.The problem that the width of the vacuum suction that the change of the width that is difficult to the light polarizing film that changes and make accompanies is also arranged in addition.
Summary of the invention
The purpose of this invention is to provide a kind of inspection method and testing fixture; do not followed the influence of the wave phenomenon, the vibration in the conveyance (rocking) etc. of the Width that moves of film; and can check out accurately the polariscope film that moves continuously, adhesive phase, diaphragm the defective, particularly air blister defect of light polarizing film of stacked lit-par-lit structure.
The present invention also provides a kind of inspection method and testing fixture, does not cause scar on the film surface, even there is the change of the width of the light polarizing film of making, also can check out defective accurately.
The present invention is the inspection method that a kind of defective that will be present in the light polarizing film that moves continuously detects according to reflected light.
It is characterized in that: the 2nd light source portion that use the 1st inspection portion have the 1st light source portion that possesses the surface that is configured in this film and the 1st test section and contact the 1st delivery roller of the inner face of supporting this film, possesses the inner face that is configured in this film and the 2nd test section and contact the testing fixture of the 2nd inspection portion of the 2nd delivery roller on the surface of this film of support.On any one light accepting part of the 1st light source portion and the 1st test section, and on any one light accepting part of the 2nd light source portion and the 2nd test section, be provided with to have and check that object is the absorption axes of light polarizing film and the polarisation member that sees through axle that forms crossed nicols.In the 1st inspection portion, light source irradiation by the 1st light source portion is by the light polarizing film of the 1st support that delivery roller contacts, detect its reflected light by the 1st test section, in the 2nd inspection portion, light source irradiation by the 2nd light source portion detects its reflected light by the light polarizing film of the 2nd support that delivery roller contacts by the 2nd test section.
By formation of the present invention, even in the occasion of controlling a plurality of means chien shih testing fixtures actions that light polarizing film transmits, testing fixture is by possessing delivery roller, can not produce the fluctuation of film and rock on the inspection position of film, makes correct defects detection become possibility.
And, check that the light polarizing film of object is checked at the member that is contacted with delivery roller, so, also can carry out the detection of defective accurately even be the very thin crooked light polarizing film of easy generation.
In addition, by on any one light accepting part of the 1st light source portion and the 1st test section, and on any one light accepting part of the 2nd light source portion and the 2nd test section, setting has checks that object is the absorption axes of light polarizing film and the polarisation member that sees through axle that forms crossed nicols, can reduce and even interdict the light that arrives detecting device from the opposition face of the light polarizing film of checking object, prevent from the dust on delivery roller surface, scar etc. are checked out as product defect.
Inspection method of the present invention is carried out to better in the darkroom basically in order to prevent the influence from the scattered light beyond the light source etc.Delivery roller makes the surface ideal for black by reducing the influence of unwanted scattered light at least.
The polarisation member that uses in the testing fixture of the present invention, as long as for obtaining the member of linear polarization light, be not particularly limited the Shi Douke use, but specifically, can exemplifying out polarizing filter, light polarizing film, spreadlight lens, polariscope (polarizer), analyzer (analyzer) etc.
In the present invention, according to the information of the defective of representing to obtain by the 1st test section and the 2nd test section, and the defective locations of mark light polarizing film is preferable.
By above-mentioned formation, can before becoming display, remove the tested rejected region of finding from through the light polarizing film of checking, eliminating in the engineering of bad part.The position of mark also maybe can be with it as the section of least unit and remove except can be when light polarizing film is punched with institute's sizing.
The present invention is a kind of testing fixture in addition, and the defective that is present in the light polarizing film that moves is continuously checked out according to reflected light.
It is characterized in that: have the 1st light source portion that possesses the surface that is configured in this film and the 1st test section and contact the 1st inspection portion, the 2nd light source portion and the 2nd test section that possess the inner face that is configured in this film of the 1st delivery roller of the inner face of supporting this film and contact the 2nd inspection portion of the 2nd delivery roller on the surface of this film of support.
On any one light accepting part of the 1st light source portion and the 1st test section, and on any one light accepting part of the 2nd light source portion and the 2nd test section, be provided with to have and check that object is the absorption axes of light polarizing film and the polarisation member that sees through axle that forms crossed nicols.
The structure that adopts is in the 1st inspection portion, light source irradiation by the 1st light source portion is by the light polarizing film of the 1st support that delivery roller contacts, detect its reflected light by the 1st test section, in the 2nd inspection portion, light source irradiation by the 2nd light source portion detects its reflected light by the light polarizing film of the 2nd support that delivery roller contacts by the 2nd test section.
The use of the testing fixture by above-mentioned formation, even in the occasion of controlling a plurality of means chien shih testing fixtures actions that light polarizing film transmits, testing fixture is by possessing delivery roller, can not produce the fluctuation of film and rock on the inspection position of film, makes correct defects detection become possibility.
And, check that the light polarizing film of object is checked at the member that is contacted with delivery roller, so, also can carry out the detection of defective accurately even be the very thin crooked light polarizing film of easy generation.
Possess the information of with good grounds expression, and the indicia means of the defective locations of mark light polarizing film is preferable by the 1st test section and the resulting defective of the 2nd test section.
Description of drawings
Fig. 1 is the sectional drawing of the configuration example of the expression display panels that uses light polarizing film.
Fig. 2 is the sectional drawing of the example of the formation of light polarizing film of expression 5 layers of structure checking object and defective.
Fig. 3 is the sectional drawing of the example of the formation of light polarizing film of expression 3 layers of structure checking object and defective.
Figure 4 shows that the configuration example of testing fixture of the present invention.
Fig. 5 is the expansion presentation graphs of the inspection portion of testing fixture of the present invention.
1. light polarizing film among the figure, 21. the 1st delivery rollers, 3. light source, 4. slit, 5. polarisation member, 6. detecting device, 12. light polarizing film, 13. diaphragms, 16. adhesive phases, 20. display panels, 21 '. liquid crystal cell, D. test section, E. light source portion.
Embodiment
According to illustrating embodiments of the invention.
In Fig. 2, Fig. 3, about the example of the light polarizing film of lit-par-lit structure and enlarge section, and the air blister defect modelling that should check out is represented.Fig. 2 is the example with light polarizing film 1 of 5 layers of structure that are made of diaphragm 13, adhesive phase 16, polariscope film 12, adhesive phase 16, diaphragm 13.In this film, the air blister defect of light polarizing film that becomes end article and be the defective of display is a, b, c, d.
Fig. 3 is the example with light polarizing film 1 of 3 layers of structure that are made of polariscope film 12, adhesive phase 16, diaphragm 13.In this film, e, f are the tested air blister defect of finding.
Member of formation as light polarizing film is the sub-film of polarisation, can use well-known polariscope film.Be generally the film that dichromatism pigments such as iodine, dichroic dye is adsorbed orientation by the polyvinyl alcohol (PVA) of high polymerization degree specifically.
Generally use triacetyl cellulose (TAC) as diaphragm.Generally use the water soluble resins such as polyvinyl alcohol (PVA) of low polymerization degree etc. as bonding agent.
Figure 4 shows that by by be configured in along the direction of arrow supply with continuously transmission light polarizing film 1 above light source portion E1, the 1st T1 of inspection portion that the delivery roller 21 of test section D1 and contact support below this film 1 forms, by be configured in light polarizing film 1 below light source portion E2, the configuration example of the testing fixture that test section D2 and the 2nd T2 of inspection portion that forms at this delivery roller that contact is supported above film 1 22 constitute.
Check that object is that light polarizing film 1 contacts in the scope of w1 with the 1st delivery roller 21, in the scope of w2, contact with the 2nd delivery roller 22.Light source portion E1 and receives its reflected light by test section D1 on the contact range w1 internal radiation light polarizing film of light polarizing film 1 and the 1st delivery roller 21.Light source portion E2 and receives its reflected light by test section D2 below the contact range w2 internal radiation light polarizing film of light polarizing film 1 and the 2nd delivery roller 22.Light source portion E1, E2 can adopt the formation that suitable slit 4 is set and only shines the necessary inspection area of light polarizing film.
Light source portion E1, E2 are provided with light source 3, and test section D1, D2 are provided with detecting device 6.The type that light source 3 can use fluorescent lamp etc. easily to obtain is if use the big type of width of illuminating part, even then how many film surfaces exists and concavo-convexly also can reduce the influence that brings to check result.The vertical plane angulation θ of the tangent line of light source and light polarizing film 1 is that 30～45 degree are preferable.
By θ being set in above-mentioned scope, even, also can go out defective with extra high accuracy checking using the identical light source portion and the occasion of test section.Test section D1, D2 for example use CCD as detecting device 6, can pass through information from the light of CCD, the detection means that the reflection of light that utilizes bubble is detected as the variation of light and shade and constituting, also can use by information and form image, check out the detection means of bubble, foreign matter by Flame Image Process from the light of CCD.As required, CCD adopts the formation that is provided with many simultaneously and can checks the gamut of Width simultaneously on the Width of film.
The 1st delivery roller the 21, the 2nd delivery roller 22 of testing fixture is a return idler, can produce deflection in case the diameter of delivery roller is too small, makes and checks that precision is low.It is preferable that the external diameter of delivery roller 21,22 is about 100～200 scope.
Fig. 5 represents inspection method expansion of the present invention with modelling.Here be depicted as the 1st inspection portion, check the example of the light polarizing film of 5 layers of structure possessing the formation that has Fig. 2 (adhesive phase omission, on the drawing with 3 layers of expression) at Fig. 4.Also carry out same inspection fully in the 2nd inspection portion.
Checking that from the light that light source portion E1 sends the position is a S position irradiation light polarizing film 1, and the reflected light detected portion D1 from this S position is received.The polariscope film 12 of formation layered polarization film 1 is made of polarisation member 5 and the crossed nicols of test section D1, does not arrive test section so arrive the illumination light on the surface of delivery roller 21.Therefore, bubble P1 (bubble a, b among Fig. 2) though tested finding, the foreign matter on delivery roller surface is not tested to be found.Bubble P3 (bubble c, d among Fig. 2) finds by the 2nd test section is tested.
The mark of defective for example can be enumerated on the transverse direction of light polarizing film with certain spacing a plurality of lettering bodies arranged side by side, and the lettering body that will be equivalent to contain the differentiation of bad part carries out method of lettering etc. by being pressed in the film surface.
Inspection method of the present invention even the protective film of peeling off is stacked in the surface of reflection polarizing plate, also can be checked when the use of the reality of liquid crystal display dish.
As inspection means of the present invention, also can adopt with the formation of light source and a plurality of arrangements of detecting device, with band shape and even the light source of straight tube-like and the formation of a plurality of detector combination of odd number.And, can adopt situation that detecting device is arranged as line sensor and any one of the situation of arranging as area sensor as test section.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002159669A JP2003344302A (en) | 2002-05-31 | 2002-05-31 | Inspection method and inspection equipment for polarizing film |
| JP2002159669 | 2002-05-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1461948A true CN1461948A (en) | 2003-12-17 |
| CN100339700C CN100339700C (en) | 2007-09-26 |
Family
ID=29773962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031383262A Expired - Fee Related CN100339700C (en) | 2002-05-31 | 2003-05-27 | Method and device for investigating polarization film |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2003344302A (en) |
| KR (1) | KR20030093956A (en) |
| CN (1) | CN100339700C (en) |
| TW (1) | TW200307118A (en) |
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| CN100462777C (en) * | 2005-12-05 | 2009-02-18 | 恩富技术株式会社 | Apparatus and method for inspecting polarizing film |
| CN100462778C (en) * | 2005-12-05 | 2009-02-18 | 恩富技术株式会社 | Polarizing film inspecting apparatus and method |
| CN101198859B (en) * | 2005-06-21 | 2012-03-28 | 郡是株式会社 | Film inspection device and film inspection method |
| CN102395919A (en) * | 2010-03-18 | 2012-03-28 | 住友化学株式会社 | Polarizer bonding precision inspection method and bonding precision inspection device |
| TWI456188B (en) * | 2008-03-31 | 2014-10-11 | Sumitomo Chemical Co | System and method for sorting polarization films |
| CN106353332A (en) * | 2015-07-15 | 2017-01-25 | 明眼有限公司 | Polarizing film testing device utilizing pattern light transmittance sheets |
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-
2002
- 2002-05-31 JP JP2002159669A patent/JP2003344302A/en active Pending
-
2003
- 2003-05-08 TW TW092112550A patent/TW200307118A/en unknown
- 2003-05-15 KR KR10-2003-0030806A patent/KR20030093956A/en not_active Application Discontinuation
- 2003-05-27 CN CNB031383262A patent/CN100339700C/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20030093956A (en) | 2003-12-11 |
| CN100339700C (en) | 2007-09-26 |
| JP2003344302A (en) | 2003-12-03 |
| TW200307118A (en) | 2003-12-01 |
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