POLARIZING PLATE AND METHOD FOR PRODUCING SAME

• US 20180120488A1
• Filed: 03/10/2016
• Published: 05/03/2018
• Est. Priority Date: 04/17/2015
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Takada, Katsunori, Nakai, Kota, Higuchi, Naotaka, Kimura, Keisuke, Kitamura, Yoshitsugu, Kuramoto, Hiroki
• Granted Patent: US 10,585,224 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133528 Polarisers

Abstract

There is provided a polarizing plate excellent in durability. A polarizing plate 100 according to one embodiment of the present invention includes a polarizer 10; and a pair of protective films 21, 22 respectively arranged on both main surfaces of the polarizer 10, wherein the polarizing plate 100 has a polarizer void portion 30 formed by positioning of an end surface 10a of the polarizer 10 inward in a plane direction relative to each of end surfaces 21a, 22a of the protective films 21, 22.

Claims

1. A polarizing plate, comprising:

a polarizer; and

a pair of protective films respectively arranged on both main surfaces of the polarizer,

wherein the polarizing plate has a polarizer void portion formed by positioning of an end surface of the polarizer inward in a plane direction relative to each of end surfaces of the protective films.

2. The polarizing plate according to claim 1, wherein the polarizer void portion is formed in a region ranging from each of the end surfaces of the protective films to a position distant therefrom by 15 μ

m or more inward in the plane direction.

3. The polarizing plate according to claim 1, wherein the polarizer void portion is formed in an end portion in an absorption axis direction.

4. The polarizing plate according to claim 1, wherein the polarizing plate has formed therein a through-hole and the polarizer void portion is formed in a peripheral edge portion of the through-hole.

5. The polarizing plate according to claim 1, wherein the polarizer void portion is formed in an outer edge portion.

6. The polarizing plate according to claim 5, wherein the outer edge portion includes a site that forms a substantially V-shape that is convex inward in the plane direction.

7. A production method for the polarizing plate of claim 1, comprising a step of bringing a treatment liquid into contact with a laminate obtained by laminating a protective film on each of both main surfaces of a polarizer.

8. The production method according to claim 7, wherein the treatment liquid contains water.

9. The production method according to claim 7, wherein the treatment liquid has a liquid temperature of 50°

C. or more.

10. The production method according to claim 7, further comprising a step of forming the laminate into a desired shape through cutting and/or punching processing.

11. The production method according to claim 10, wherein the cutting and/or the punching processing is performed by laser light irradiation.

12. The production method according to claim 11, wherein the laser light comprises CO₂ laser light.