KR20140111483A - Apparatus for inspecting polarizing film - Google Patents

Apparatus for inspecting polarizing film Download PDF

Info

Publication number
KR20140111483A
KR20140111483A KR1020130025694A KR20130025694A KR20140111483A KR 20140111483 A KR20140111483 A KR 20140111483A KR 1020130025694 A KR1020130025694 A KR 1020130025694A KR 20130025694 A KR20130025694 A KR 20130025694A KR 20140111483 A KR20140111483 A KR 20140111483A
Authority
KR
South Korea
Prior art keywords
light
polarizing film
unit
irradiation
light guide
Prior art date
Application number
KR1020130025694A
Other languages
Korean (ko)
Inventor
허재영
박재현
Original Assignee
동우 화인켐 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 동우 화인켐 주식회사 filed Critical 동우 화인켐 주식회사
Priority to KR1020130025694A priority Critical patent/KR20140111483A/en
Publication of KR20140111483A publication Critical patent/KR20140111483A/en

Links

Images

Classifications

    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8422—Investigating thin films, e.g. matrix isolation method
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens

Landscapes

  • 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)
  • Mathematical Physics (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Polarising Elements (AREA)

Abstract

A polarizing film inspection apparatus is disclosed. The apparatus for inspecting a polarizing film according to an embodiment of the present invention includes a plurality of light sources, an irradiating unit for irradiating light generated from a light source with a polarizing film at a lower portion of the polarizing film, a plurality of light sources and irradiating units And a plurality of optical fibers connecting the light source and one side of the irradiation unit inside the light transmission unit and connected to the other side of the irradiation unit from inside the irradiation unit.

Figure P1020130025694

Description

[0001] APPARATUS FOR INSPECTING POLARIZING FILM [0002]

An embodiment of the present invention relates to a polarizing film inspection apparatus, and more particularly, to a polarizing film inspection apparatus capable of accurately checking whether a polarizing film is defective.

A polarizing film is for polarizing light in a specific direction. The polarizing film is used, for example, to adhere to both surfaces of a liquid crystal cell in a liquid crystal display (LCD) to form a liquid crystal panel. In theory, the polarizing film should be free of light passing through the polarizing film when two polarizing films are stacked orthogonally (that is, when the transmission axes of the two polarizing films are stacked so as to be perpendicular to each other). In this case, the image of the polarizing film is cut off and black is displayed, which is called a black mode of the polarizing film.

Generally, in a black mode state of a polarizing film, when two polarizing films stacked in an orthogonal state from a light source provided on one side are irradiated with light, the camera installed on the other side photographs and inspects the polarizing film. In the black mode state of the polarizing film, the light does not pass through the polarizing film, so that the entire image taken of the polarizing film must be black. However, in the course of producing the polarizing film, defects (for example, If there is uneven dyeing, poor adhesion, surface scratches, foreign matter, etc.), the light is not 100% blocked and a brightness difference occurs in the image of the polarizing film. At this time, the defect of the polarizing film is detected through the brightness difference shown in the photographed image.

1 is a view showing a conventional polarizing film inspection apparatus.

1, the polarizing film inspection apparatus 10 includes a light source 12, a light transmitting portion 14, an irradiating portion 16, a polarizing film 18, a cross filter 20, and a photographing portion 22 . The light transmitting unit 14 is connected to the side surface of the irradiating unit 16 and transmits the light generated by the light source 12 to the irradiating unit 16.

The conventional polarizing film inspection apparatus 10 can not connect a large number of light sources 12 to the irradiation unit 16 because the light transmission unit 14 is connected to the side surface of the irradiation unit 16, The amount of light to be irradiated is reduced. When the amount of light irradiated to the polarizing film 18 in the irradiating unit 16 is small, there is a problem that defects such as fine spots or small scratches of the polarizing film 18 are not detected well in the image taken by the photographing unit 22 .

An embodiment of the present invention is intended to provide a polarizing film inspection apparatus which can accurately detect micro-defects of a polarizing film.

1. A polarizing film inspection apparatus according to an embodiment of the present invention includes: a plurality of light sources; An irradiating unit for irradiating light generated from the light source with the polarizing film at a lower portion of the polarizing film; A plurality of light transmission parts formed at the lower part of the irradiation part and connecting the plurality of light sources and the irradiation part respectively and transmitting light generated from the light source to the irradiation part; And a plurality of optical fibers connecting the light source and one side of the irradiation unit inside the light transmission unit and connected to the other side of the irradiation unit inside the irradiation unit.

In 2.1, the irradiation unit includes a light guide part having one surface connected to the light transmission part; And a lens unit formed on the light guide unit. The plurality of optical fibers are randomly dispersed and connected to the other surface of the light guide unit in the light guide unit.

In 3.2, the irradiation unit further includes a diffusion unit formed between the light guide unit and the lens unit.

In 4.1, the polarizing film inspection apparatus comprises: a cross filter formed on the polarizing film and having a transmission axis perpendicular to the transmission axis of the polarizing film; And a photographing unit for photographing the polarizing film at an upper portion of the cross filter.

According to the embodiment of the present invention, light emitted from a plurality of light sources can be transmitted by connecting a light transmitting portion to a lower portion of the irradiating portion, thereby increasing the amount of light irradiated from the irradiating portion to the polarizing film. By randomly dispersing the optical fibers in the light guide portion and connecting the optical fibers to the other surface of the light guide portion, light can be uniformly irradiated over the entire area of the irradiation portion, and the amount of light irradiated by the irradiation portion can be maximized. In this case, the imaging unit can accurately detect defects such as fine spots and fine scratches of the polarizing film on the image of the polarizing film.

1 is a view showing a conventional polarizing film inspection apparatus.
2 illustrates a polarizing film inspection apparatus according to an embodiment of the present invention.
3 is a view showing a light transmitting portion and an irradiating portion in a polarizing film testing apparatus according to an embodiment of the present invention.
4 is a plan view showing optical fibers randomly dispersed on the other surface of a light guide portion in a polarizing film inspection apparatus according to an embodiment of the present invention.
FIG. 5 is a graph comparing brightness graphs of images and photographed images taken by a polarizing film testing apparatus of the related art, and brightness graphs of images taken by a polarizing film testing apparatus according to an embodiment of the present invention.

Hereinafter, a specific embodiment of the polarizing film inspection apparatus of the present invention will be described with reference to FIGS. 2 to 5. FIG. However, this is an exemplary embodiment only and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for efficiently describing the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

2 is a view showing a polarizing film inspection apparatus according to an embodiment of the present invention.

2, the polarizing film inspection apparatus 100 includes a light source 102, a light transmitting unit 104, an irradiating unit 106, a polarizing film 108, a cross filter 110, and a photographing unit 112 .

The light source 102 serves to generate light. As the light source 102, for example, a metal halide lamp, an LED lamp (Light Emitting Diode Lamp), or the like may be used, but the present invention is not limited thereto, and various other light sources may be used. In the polarizing film inspection apparatus 100, a plurality of light sources 102 are used.

The light transmission unit 104 connects each of the plurality of light sources 102 to the irradiation unit 106. For example, one side of the light transmitting portion 104 may be connected to the lower portion of the irradiation portion 106, and the other side of the light transmitting portion 104 may be connected to the light source 102. As described above, when one side of the light transmitting portion 104 is connected to the lower portion of the irradiating portion 106, a large number of light sources 102 can be connected to the irradiating portion 106 through the light transmitting portion 104. A plurality of optical fibers may be formed in each light transmitting portion 104 by connecting the light source 102 and the irradiating portion 106. In this case, the light generated by the light source 102 is transmitted to the irradiation unit 106 through the optical fiber in the light transmission unit 104.

The irradiating unit 106 serves to irradiate light with the polarizing film 108. Since the irradiation unit 106 irradiates the light received from the plurality of light sources 102 with the polarizing film 108, it is possible to irradiate a large amount of light with the polarizing film 108. At this time, the irradiation unit 106 uniformly disperses the light received from the plurality of light sources 102, and irradiates the polarized light 108 with the polarized light. Details of the configuration of the examination unit 106 will be described later with reference to Fig.

The cross filter 110 is located on the top of the polarizing film 108. The transmission axis of the cross filter 110 is formed to be perpendicular to the transmission axis of the polarizing film 108. For example, when the transmission axis of the polarizing film 108 is formed in the transverse direction (-), the transmission axis of the cross filter 110 is formed so as to be in the vertical direction (). By forming the transmission axis of the cross filter 110 so as to be perpendicular to the transmission axis of the polarizing film 108, the black mode of the polarizing film 108 can be realized and defects of the polarizing film 108 (for example, Adhesion, adhesion failure, surface scratch, foreign matter, etc.) can be detected.

The photographing unit 112 is located above the cross filter 110. At this time, the photographing section 112 photographs the polarizing film 108 in the direction opposite to the irradiating section 106. The photographing unit 112 detects a defect in the polarizing film 108 by using the image of the polarizing film 108 taken.

3 is a view showing a light transmitting part and an irradiating part in the apparatus for inspecting a polarizing film according to an embodiment of the present invention.

Referring to FIG. 3, ten light sources 102-1 through 102-10 are connected to the irradiating unit 106 through the light transmitting unit 104. FIG. In this case, since the light generated by the ten light sources 102-1 to 102-10 is transmitted to the irradiation unit 106, the amount of light irradiated to the polarizing film 108 in the irradiation unit 106 can be increased. Although the ten light sources 102-1 through 102-10 are illustrated as being connected to the irradiating unit 106 through the light transmitting unit 104, the present invention is not limited thereto, and various other light sources 102 may be used. And may be connected to the irradiation unit 106 through the light transmitting unit 104. A plurality of optical fibers 120 may be formed in each light transmitting portion 104 by connecting the light source 102 and the irradiating portion 106. At this time, for example, tens to hundreds of optical fibers 120 may be formed in the light transmitting portion 104, but the number of the optical fibers 120 is not limited thereto.

The irradiation section 106 includes a light guide section 111, a diffusing section 114, and a lens section 117. One surface of the light guide portion 111 is connected to one side of the light transmitting portion 104. The optical fibers 120 of the light transmitting portions 104 are dispersed and connected to the other surface of the light guide portion 111 in the light guide portion 111. [ In this case, light is directly emitted from the other surface of the light guide part 111 through the optical fibers 120. Thereby minimizing the loss of light in the irradiating unit 106. At this time, the optical fibers 120 of each light transmitting portion 104 may be randomly dispersed and connected from one surface of the light guide portion 111 to the other surface. That is, one end of each optical fiber 120 is connected to the light source 102, and the other end of each optical fiber 120 can be connected to the other side of the light guide unit 111. This will be described with reference to FIG.

4 is a plan view showing optical fibers randomly dispersed on the other surface of a light guide part in a polarizing film inspection apparatus according to an embodiment of the present invention.

4, a first optical fiber 1 connected to the first light source 102-1 and a second optical fiber 2 connected to the second light source 102-2 are formed on the other surface of the light guide unit 111, A third optical fiber 3 connected to the third light source 102-3, a fourth optical fiber 4 connected to the fourth light source 102-4, a fifth optical fiber 4 connected to the fifth light source 102-5, The sixth optical fiber 6 connected to the sixth optical source 102-6, the seventh optical fiber 7 connected to the seventh optical source 102-7, the eighth optical source 102-8, The ninth optical fiber 9 connected to the eighth optical fiber 8 connected to the ninth optical source 102-9 and the tenth optical fiber 10 connected to the tenth optical source 102-10 are randomly dispersed You can see the connection.

If the optical fibers 120 are randomly dispersed in the light guide part 111 and connected to the other surface of the light guide part 111, light can be directly transmitted from the other side of the light guide part 111 through the optical fibers 120 The amount of light irradiated by the irradiation unit 106 can be maximized. Even if an error occurs in any one of the ten light sources 102-1 to 102-10, the amount of light irradiated from the entire area of the light guide unit 111 can be made uniform.

Referring again to FIG. 3, the diffusion part 114 is formed on the upper part of the light guide part 111. The diffusion part 114 disperses the light emitted from the optical fibers 120 connected to the other surface of the light guide part 111 upward. As the diffusion portion 114, for example, a light diffusion sheet may be used, but the present invention is not limited thereto.

The lens portion 117 is formed on the upper portion of the diffusion portion 114. The lens unit 117 serves to condense the light dispersed in the diffusion unit 114 into the polarizing film 108. The lens unit 117 may be, for example, at least one lenticular pattern or a plurality of hemispherical lenses, but the present invention is not limited thereto, and various other lenses may be used.

Here, the irradiation unit 106 includes the light guide unit 111, the diffusion unit 114, and the lens unit 117, but the present invention is not limited thereto, and the irradiation unit 106 may be implemented without the diffusion unit 114 .

According to the embodiment of the present invention, the light transmitting portion 104 may be connected to the lower portion of the irradiating portion 106 to receive light generated from the plurality of light sources 102, ) Can be increased. The optical fibers 120 are randomly dispersed in the light guide part 111 and are connected to the other surface of the light guide part 111 so that light can be uniformly irradiated over the entire area of the irradiation part 106, It is possible to maximize the quantity of light irradiated by the light source 106. In this case, the imaging unit 112 can accurately detect defects such as fine spots and fine scratches of the polarizing film 108 on the image of the polarizing film 108. [

FIG. 5 is a graph comparing a brightness graph of an image and a photographed image captured by a conventional polarizing film inspection apparatus, and a brightness graph of an image and a photographed image captured by a polarizing film inspection apparatus according to an embodiment of the present invention.

Referring to FIG. 5, it can be seen that defects of the polarizing film 108 appear to be faint to the naked eye in an image taken by a polarizing film inspection apparatus of the prior art. In this case, it can be seen that the brightness level (for example, gray level) in the defective portion of the polarizing film 108 corresponds to 55 in the brightness graph of the photographed image.

On the other hand, in the image taken by the polarizing film inspection apparatus 100 of the present invention, it can be seen that defects of the polarizing film 108 appear more clearly than those of the prior art. In the brightness graph of the photographed image, it can be seen that the brightness level (for example, gray level) is 100 or more in the defective portion of the polarizing film 108.

As described above, according to the polarizing film inspection apparatus 100 of the present invention, by minimizing the amount of light irradiated by the irradiation unit 106, it is possible to accurately detect fine spots and fine scratches generated in the polarizing film 108. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: polarizing film inspection apparatus 102: light source
104: optical transmission unit 106:
108: polarizing film 110: cross filter
112: photographing section 121: light guide section
124: diffusion part 127: lens part
130: optical fiber

Claims (4)

A plurality of light sources;
An irradiating unit for irradiating light generated from the light source with the polarizing film at a lower portion of the polarizing film;
A plurality of light transmission parts formed at the lower part of the irradiation part and connecting the plurality of light sources and the irradiation part respectively and transmitting light generated from the light source to the irradiation part; And
And a plurality of optical fibers connecting the light source and one side of the irradiation unit inside the light transmission unit and connected to the other side of the irradiation unit inside the irradiation unit.
The method according to claim 1,
The irradiation unit
A light guide part having one surface connected to the light transmitting part; And
And a lens unit formed on the light guide unit,
Wherein the plurality of optical fibers are randomly dispersed and connected to the other surface of the light guide portion inside the light guide portion.
3. The method of claim 2,
The irradiation unit
And a diffusing portion formed between the light guide portion and the lens portion.
The method according to claim 1,
Wherein the polarizing film inspection apparatus comprises:
A cross filter formed on the polarizing film and having a transmission axis perpendicular to the transmission axis of the polarizing film; And
And a photographing unit for photographing the polarizing film at an upper portion of the cross filter.
KR1020130025694A 2013-03-11 2013-03-11 Apparatus for inspecting polarizing film KR20140111483A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130025694A KR20140111483A (en) 2013-03-11 2013-03-11 Apparatus for inspecting polarizing film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130025694A KR20140111483A (en) 2013-03-11 2013-03-11 Apparatus for inspecting polarizing film

Publications (1)

Publication Number Publication Date
KR20140111483A true KR20140111483A (en) 2014-09-19

Family

ID=51756952

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130025694A KR20140111483A (en) 2013-03-11 2013-03-11 Apparatus for inspecting polarizing film

Country Status (1)

Country Link
KR (1) KR20140111483A (en)

Similar Documents

Publication Publication Date Title
KR101326455B1 (en) Apparatus and method for characterizing defects in a transparent substrate
CN101876641B (en) Method and device for detecting the defect in a glass plate
US8803968B2 (en) Apparatus for detecting particles in flat glass and detecting method using same
KR101120226B1 (en) Surface inspecting apparatus
KR101207146B1 (en) Apparatus and method for light emitting module's optical axis measuring
TWI553307B (en) Transparent substrate for visual inspection device and appearance inspection method
CA2568260A1 (en) Transparent material inspection system
JP5538220B2 (en) Non-uniformity inspection method for polarizing plate using image analysis, and automatic non-uniformity inspection system for polarizing plate using the same
KR20130103454A (en) Apparatus for inspecting cylinder
CN106092970B (en) A kind of Systems for optical inspection and optical detection apparatus
CN101076720B (en) Apparatus for inspecting backlight unit
KR20190023146A (en) Apparatus for inspecting a blowhole of Lead-Tab
KR101006983B1 (en) detecting apparatus for panel
CN103439812B (en) Liquid crystal glass base 45° angle inspection technique
KR20160117815A (en) Optical Inspection Apparatus
KR20140087585A (en) Apparatus for inspecting polarizing film
TWI470210B (en) Defect inspection method of optical layer part of display device
KR20140111483A (en) Apparatus for inspecting polarizing film
KR20130051874A (en) Glass inspecting device
JP2017187425A (en) Defect inspection device, defect inspection method, and method of manufacturing balloon catheter
KR20140088789A (en) Inspection device for optical film
JP5521283B2 (en) Board inspection equipment
JP2013210245A (en) Film inspection system, and film inspection method
KR20200000221A (en) System for inspecting foreign matter of display unit
KR20220117060A (en) Defect inspection apparatus

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination