Optical film roll

Patent metadata

Field	Value
Publication number	US-9977167-B2
Application number	US-201314373788-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Mar 14, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

An optical film roll is disclosed capable of realizing excellent display characteristics while maintaining manufacturing efficiency. The optical film roll has a width corresponding to a pair of opposite sides of a liquid crystal cell and is used by being cut to a length corresponding to another pair of opposite sides of the liquid crystal cell to be continuously attached to a surface of the liquid crystal cell. The optical film roll includes a long optical film wound into a roll shape, the long optical film being obtained by subjecting a long optical raw film, which is produced by laminating a polarizing film having an absorption axis in its width direction, and a reflective polarizing film having a reflection axis in its width direction, to a slitting process in a machine direction while conveying the long optical raw film in its lengthwise direction.

First claim

The invention claimed is:

1. A manufacturing method for an optical film roll having a width corresponding to a pair of opposite sides of a liquid crystal cell, and used by being cut to a length corresponding to another pair of opposite sides of the liquid crystal cell to be continuously attached to a surface of the liquid crystal cell,
the manufacturing method comprising the steps of:
producing a long optical raw film by laminating a polarizing film having an absorption axis in its width direction, and a reflective polarizing film having a reflection axis in its width direction in the stated order;
subjecting the optical raw film to a slitting process in a direction parallel to a lengthwise direction of the optical raw film to a width corresponding to the pair of opposite sides of the liquid crystal cell; and
winding a long optical film obtained in the slitting step into a roll shape; and

the polarizing film has a thickness of less than 10 μm, and the long optical raw film has a total thickness of 231 μm or more but less than 935 μm,
wherein the optical raw film includes a release film, a pressure-sensitive adhesive layer, the polarizing film, and the reflective polarizing film, which are laminated in the stated order.

Assignees

• Nitto Denko Corp

Inventors

• Hirata Satoshi
• Kondo Seiji
• Hada Kazuya

Classifications

• G02B5/3058 Primary

  comprising electrically conductive elements, e.g. wire grids, conductive particles · CPC title

• B32B2038/045

  Slitting · CPC title

• B32B38/04

  Punching, slitting or perforating · CPC title

• B29K2995/0034

  Polarising · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title