发明授权
- 专利标题: Retardation film, process for producing the same, optical film, image display, liquid crystal panel and liquid crystal display
- 专利标题(中): 延迟膜,其制造方法,光学膜,图像显示器,液晶面板和液晶显示器
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申请号: US11491255申请日: 2006-07-24
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公开(公告)号: US07391935B2公开(公告)日: 2008-06-24
- 发明人: Satoru Kawahara , Masaki Hayashi , Shuuji Yano , Kenji Yoda , Kentarou Kobayashi
- 申请人: Satoru Kawahara , Masaki Hayashi , Shuuji Yano , Kenji Yoda , Kentarou Kobayashi
- 申请人地址: JP Ibaraki-shi, Osaka
- 专利权人: Nitto Denko Corporation
- 当前专利权人: Nitto Denko Corporation
- 当前专利权人地址: JP Ibaraki-shi, Osaka
- 代理机构: Westerman, Hattori, Daniels & Adrian, LLP.
- 优先权: JP2004-229565 20040805; JP2005-123874 20050421
- 主分类号: G02B6/00
- IPC分类号: G02B6/00 ; G02F1/1335
摘要:
A retardation film of the present invention comprises a stretched film of a polymer film containing a norbornene-based resin, wherein the stretched film satisfies the following equation (1) and the equation (2); 100 nm≦(nx−ny)·d≦350 nm, (1) 0.1≦(nx−nz)/(nx−ny)≦0.9, (2) where the refractive indices in the slow axis direction, the fast axis direction and the thickness direction of the film are nx, ny and nz, respectively, d(nm) is thickness of the film, and the slow axis direction is a direction that the refractive index in film plane is maximum. The retardation film is hard to cause a shift or an unevenness of a retardation value due to a stress.