KR100616128B1 - Inspection member and inspectionn method using the same - Google Patents

Abstract

An inspection member formed by laminating an adhesive member on a substrate in order to accurately determine the quality of an optical film, wherein at least one of the substrate and the adhesive member is a light shielding member.

Light blocking member, adhesive member, optical film, base, transparent resin layer

Description

Inspection member for optical film and inspection method using same {INSPECTION MEMBER AND INSPECTIONN METHOD USING THE SAME}

1 is a cross-sectional view showing an example of a state in which an inspection member is bonded to an optical film according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing an inspection method for inspecting the optical film using the inspection member according to an embodiment of the present invention.

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

10: inspection member

11: shading member

11a: one side of the light blocking member 11

12: adhesive member

20: optical film

The present invention relates to an inspection member for an optical film and an inspection method for an optical film.

In recent years, an optical film is used for the surface of the polarizing plate assembled to the front surface, such as a liquid crystal display. This optical film is an anti-glare film or an anti-reflection film, which prevents scratches on a liquid crystal screen, or suppresses reflection and glare caused by light such as sunlight, external light, fluorescent light, or the like. It is used to make the LCD screen easier to see. In addition, an antireflection film for PDP is also used on the surface of glass as an optical film on the foremost surface of a plasma display panel (PDP).

Thus, when using an optical film for a liquid crystal monitor etc., when a bubble and a foreign material exist in the inside of a polarizing film, it will interfere with display characteristics. Therefore, the method of inspecting the abnormality of an optical film is proposed (for example, refer Unexamined-Japanese-Patent No. 6-288927). In the inspection method described in this patent document, an inspection object such as a film is placed on a black plate and light is irradiated to the inspection object. Then, the reflected light of the irradiated light is photographed by the imaging device to detect a defective portion of the object under test.

Moreover, the method of apply | coating black ink to one surface of an optical film, irradiating light from the other surface of an optical film, and observing reflected light is also proposed. Moreover, the method which superimposes a polarizing film so that it may orthogonally cross a polarization axis direction, makes a cross-nicol, bonds to one side of an optical film, and irradiates light similarly and observes reflected light is also proposed.

However, in the inspection method of the film as described in the said patent document, an air layer is formed between a film and a black board, and since extra disturbance light is generated by this air layer, inspection precision falls. On the other hand, when black ink is applied, coating unevenness occurs, and it is difficult to determine whether it is a defect or coating unevenness inside the optical film. In addition, since the optical film is permeated by the solvent of the black ink, long-term storage is impossible. In addition, there is a problem that the site is contaminated by black ink.

On the other hand, when laminating | stacking a polarizing film and bonding to one surface of an optical film, since it is difficult to bond so that it may become cross nicol (cross-nicol), instability will arise in quality. Moreover, since the polarizing film bonded to cross nicol is a single plate normally, it is hard to use because it is large in a dimensional restriction, and the cost required for a test | inspection becomes expensive.

This invention is made | formed in order to solve the said subject, and an object of this invention is to provide the inspection member for optical films and the inspection method of an optical film which can determine the quality of an optical film with high precision.

In order to achieve the above object, the present invention provides the following means.

An inspection member for an optical film of the present invention is an inspection member formed by laminating an adhesive member on a substrate, wherein at least one of the substrate and the adhesive member is a light shielding member.

In the inspection member for optical films of this invention, it is preferable that the said adhesive member is a light-shielding member and contains a coloring component.

In the test | inspection member for optical films of this invention, it is preferable that the said base material is a light-shielding member, and is provided with the thinly-slit metal.

The inspection method of the optical film of this invention is an inspection method which test | inspects an optical film using the said inspection member for optical films, The process of adhering an optical film on the said adhesive member, and irradiating light to the surface of the said optical film And a step of observing the reflected light from the optical film, and a step of determining the quality of the optical film based on the observed reflected light.

Best Mode for Carrying Out the Invention

Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the inspection member 10 for the optical film 20 according to the present embodiment is disposed on the light blocking member 11 that blocks light transmission and on one surface 11a of the light blocking member 11. And the adhesive member 12 which adheres the optical film 20 and the light shielding member 11 to each other.

The light shielding member 11 is a resin film and consists of black polyethylene terephthalate (henceforth simply black PET) material. As a result, the cross nicol state is simulated. Moreover, since the cross nicol state is the most preferable as the light shielding member 11, it is preferable that it is a member which is black and can shield light. Therefore, although the light shielding member 11 was made to be a resin film, it is not limited to this, It may be black plate shape, such as an iron plate.

In the adhesive member 12, it is preferable that the acrylic resin is colored with a black dye. In addition, when the coloring agent which colors the adhesive member 12 is pigment type, such as carbon black, pigment particle may be reflected by light, and it is hard to observe defects, such as a foreign material, when examining an optical film. For this reason, a black dye-based colorant is preferable. The adhesive member colored in this manner is preferable because the scattered light on the surface of the optical film can be suppressed and the inspection accuracy can be improved.

As the adhesive member 12, not only acrylic resin but adhesive materials, such as EVA type, an olefin type, polyester type, silicone type, urethane type, are mentioned, for example. Among these, acrylic resins having the same refractive index as the base 22 and good transparency are preferable.

In the optical film 20 inspected by the inspection member 10 of the present invention, the transparent resin layer 21 and the base 22 in contact with the transparent resin layer 21 disposed on one end 22a side are laminated. It is made up of. And the surface by the other end 22b side of the base | substrate 22 is adhere | attached on the adhesive member 12. As shown in FIG.

Moreover, although resin which comprises this transparent resin layer 21 is optically transparent resin, if light is permeate | transmitted, even if it is a non-transparent state, it can be used. In general, the higher the transparency of these resins, the better. The light transmittance (JIS C6714) is preferably 80% or more, more preferably 85% or more. Moreover, as this transparent resin, when light transmittance is high, resin itself can be colored, and even if it colored with dye or a pigment, it can test | inspect.

Examples of the material that satisfies this property include a so-called pressure-sensitive adhesive having continuous adhesiveness, but in addition to this, the adhesiveness is exhibited at the time of heating, the adhesiveness is shown by including a solvent, and the material is cured by light or heat. The previous state can be used.

Examples of these resins include resins such as polyesters, polyamides, polyvinyl alcohols, polyurethanes, polystyrenes, polyacetals, polycarbonates, acrylics, epoxies, silicones, celluloses, and various derivatives thereof, but are not limited thereto. It is not.

In addition, in order to obtain high light transmittance, it is preferable that the refractive index of the transparent resin layer 21 exists in the range of 1.40-1.70.

As the base 22, a transparent film can be generally used. As long as light is transmitted, the non-transparent one can be used. However, the higher the transparency of these light-transmissive substrates is, the better, the light transmittance (JIS C6714) is 80% or more, more preferably 85% or more, And haze value (JIS K7105) is 3.0 or less, More preferably, it is 1.0 or less, Most preferably, 0.5 or less, Furthermore, what has a refractive index of 1.40-1.80 can be used suitably. Specifically, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), triacetyl cellulose (TAC), polyarylate, polyimide, polyether, polycarbonate, polyether sulfone, polyether sulfone, cellophane, polyamide , Various resin films made of polyethylene, polypropylene, polyvinyl alcohol and the like can be used.

In addition, the refractive index of the adhesive member 12 is preferably equivalent to the substrate 22 in order to prevent reflection of the interface between the substrate 22 and the adhesive member 12.

As shown in FIG. 2, the inspection apparatus 30 for inspecting the optical film 20 is flat and at the same time the base 31 on which the optical film 20 can be mounted, and the optical film 20 is lighted to the optical film 20. The light irradiation part 32 which irradiates this is provided. As this light irradiation part 32, although it is a fluorescent lamp of three wavelengths generally, tungsten lamp light, a green lamp, a solar lamp etc. can be used according to a use.

Next, the method to test the optical film 20 using the inspection member 10 of the present Example which consists of the above structure is demonstrated below.

First, the surface of the other end 22b side of the base body 22 of the optical film 20 is adhered on the adhesive member 12.

Then, as shown in FIG. 2, the optical film 20 which adhere | attached the inspection member 10 is mounted in the base 31 so that the inspection member 10 may be located in the base 31 side. And light is irradiated to the surface of the optical film 20 from the light irradiation part 32, and the reflected light from the optical film 20 is visually observed. Next, the quality of the optical film 20 is judged based on haze unevenness or color tone of the reflected light observed with the naked eye.

In addition, this Example is not limited to visual observation, You may judge the quality of the optical film 20 by a spectrophotometer, a haze meta, etc. by the deviation of a spectral spectrum, a haze value, or the like.

According to the inspection member 10 for the optical film 20 according to the present embodiment, since the adhesive member 12 is colored with black dye on the acrylic resin, the refractive index inside the adhesive member 12 becomes uniform. It becomes possible to suppress the diffuse reflection in the inside. Moreover, since the light shielding member 11 is a resin film, since the inspection member 10 can be made into roll shape, when the optical film 20 is a roll, it is very convenient.

<Example>

Next, the Example which actualized this invention further is demonstrated.

[First Production Example]

A low antireflection film (optical-film) 20 is produced that includes all of streaks, color spots, short spots, and spot defects. The manufacturing method of this low reflection prevention film 20 is manufactured using a coating apparatus (not shown).

Second Production Example

In the manufacturing method of the test | inspection member 10, first, 4.5 mass parts of black dyes are added to an optical use acrylic adhesive with respect to adhesive solid content, and it stirs with a stirrer for 20 minutes. And the black adhesive produced using the applicator (not shown) is apply | coated to peeling PET (not shown), and it puts in 80 degreeC oven (not shown) for 2 minutes. After heating in an oven, the peeling PET is peeled from the black pressure sensitive adhesive sheet (adhesive member) 12. The obtained black adhesive sheet 12 is bonded to the black PET 11, and the test | inspection member 10 is produced.

[First Comparative Example]

A black cloth (MIYUKITEX M700) is laid on the base 31, the low reflection prevention film 20 is mounted on it, and the surface inspection of the low reflection prevention film is performed.

Second Comparative Example

Black ink is dripped on the back surface of the low reflection prevention film 20, and ink is apply | coated with a dedicated brush and an evaluation sample is produced. And the low reflection prevention film 20 is mounted on the base 31, and the surface inspection of the low reflection prevention film 20 is performed.

Third Comparative Example

After bonding polarizing plate (HLC2-5618) so that it may become a cross nicol state, a polarizing plate and the low reflection prevention film 20 are bonded together using a laminator. And the low reflection prevention film 20 is mounted on the base 31, and the surface inspection of the low reflection prevention film 20 is performed.

 [First Embodiment]

Using the laminator, the low reflection prevention film 20 and the test | inspection member 10 produced by the 2nd manufacture example are bonded together, and the evaluation sample as shown in FIG. 1 is produced. And the low reflection prevention film 20 is mounted on the base 31, and the surface inspection of the low reflection prevention film 20 is performed.

About each of the low reflection prevention films 20 of the said 1st-3rd comparative example and 1st Example, as shown in FIG. 2, the low reflection prevention film 20 is visually observed under 3 wavelength fluorescent lamps. The external reference level of the low reflection prevention film 20 was evaluated based on the following reference | standard.

The results are shown in Table 1.

Evaluation stripe Color blotches Sweet stain Point defect Comparative Example 1 Black cloth × × × ○ 2nd comparative example Black ink ○ × × ○ Third Comparative Example Polarizer ○ ○ × ○ First embodiment Black PET ○ ○ ○ ○

Criteria:

Stripe ○: Stripe visible ×: Stripe not visible

Color stain ○: Color stain visible ×: Color stain not visible

Stage stain ○: Stage stain visible ×: Stage stain not visible

Defects ○: Defects visible ×: Defects not visible

As is clear from Table 1, when the inspection methods of the first to third comparative examples are used, any one of stripes, color unevenness, and sweet unevenness is not visible, so that the defective product cannot be reliably determined to be defective, so the measurement accuracy is poor. . That is, in the inspection method using the inspection member 10 of the present invention, it is possible to recognize all of stripes, color unevenness, short unevenness, and spot defects, so that it is possible to judge the quality of the low reflection prevention film 20 with high accuracy. Become.

In addition, the technical scope of this invention is not limited to the said Example, A various change can be added in the range which does not deviate from the meaning of this invention.

Since the inspection member for optical films which concerns on this invention is a structure provided with the light shielding member which interrupts the transmission of light, and the adhesive member arrange | positioned at one side of the said light shielding member, and adhere | attaches an optical film and a light shielding member, The optical film and the light blocking member can be brought into close contact with each other, whereby extra disturbance light can be suppressed. Thus, only light reflected from the optical film can be detected. Further, the use of the light shielding member prevents coating unevenness as in the prior art, so that inspection accuracy can be improved because the light can be completely blocked and inspected. Moreover, since it is a simple structure, it is also possible to reduce the cost required for inspection.

Another inspection member for an optical film according to the present invention has a substrate and a light shielding member having adhesiveness that is disposed on one side of the substrate and can adhere the optical film and the member. It can make a close contact and can suppress an extra disturbance light by this. Thus, only light reflected from the optical film can be detected.

Moreover, according to the inspection method of the optical film which concerns on this invention, the process of adhering an optical film on an adhesive member, the process of irradiating light to the surface of an optical film, the process of observing the reflected light from an optical film, and observation Since it is equipped with the process of judging the quality of an optical film based on the reflected light, it becomes possible to inspect the quality of an optical film with high precision, and since it is a simple inspection process, the inspection efficiency of an optical film is also improved.

Claims (10)

As an inspection member formed by laminating an adhesive member on a substrate, At least one of the said base material and an adhesive member is a light shielding member, The inspection member for optical films characterized by the above-mentioned. The method of claim 1, The said adhesive member is a light-shielding member containing a coloring component, The inspection member for optical films characterized by the above-mentioned. The method of claim 2, The said coloring component is black, The inspection member for optical films characterized by the above-mentioned. The method of claim 3, The said black color is colored by dye, The inspection member for optical films characterized by the above-mentioned. The method of claim 1, The said adhesive member is an acrylic resin as a main component, The inspection member for optical films characterized by the above-mentioned. The method of claim 1, The said base material is a resin film, The inspection member for optical films characterized by the above-mentioned. The method of claim 6, The resin film is a polyethylene terephthalate film, the inspection member for an optical film. The method of claim 1, A protective layer is formed on the surface of the said adhesive member, The inspection member for optical films characterized by the above-mentioned. The method according to claim 1 or 6, The said base material is a light-shielding member, and is equipped with metal foil, The inspection member for optical films characterized by the above-mentioned. As the inspection method of an optical film using the inspection member for optical films of Claim 1, Adhering an optical film on the adhesive member; Irradiating light onto the surface of the optical film; Observing the reflected light from the optical film; And determining the quality of the optical film based on the observed reflected light.

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