| US 7,583,342 B2 | ||
| Optical resin film and polarizing film and liquid crystal display device using the same | ||
| Yoichi Maruyama, Minami-Ashigara (Japan); Yukito Saitoh, Minami-Ashigara (Japan); Yoshiaki Hisakado, Minami-Ashigara (Japan); and Susumu Sugiyama, Minami-Ashigara (Japan) | ||
| Assigned to Fujifilm Corporation, Minato-Ku, Tokyo (Japan) | ||
| Filed on Aug. 16, 2006, as Appl. No. 11/504,690. | ||
| Claims priority of application No. 2005-236753 (JP), filed on Aug. 17, 2005; and application No. 2006-066459 (JP), filed on Mar. 10, 2006. | ||
| Prior Publication US 2007/0046864 A1, Mar. 01, 2007 | ||
| Int. Cl. G02F 1/1335 (2006.01); G02B 5/30 (2006.01) | ||
| U.S. Cl. 349—117 [359/500] | 8 Claims |
| 1. An optical resin film, which has Re (λ) and Rth (λ) satisfying retardation requirements (A) to (D), and has an in-plane
width direction retardation (Re) variation coefficient of 5% or less and a thickness direction retardation (Rth) variation
coefficient of 10% or less:
(A) 0.1<Re (450)/Re (550)<0.95
(B) 1.03<Re (650)/Re (550)<1.93
(C) 0.4<(Re/Rth (450))/(Re/Rth (550)))<0.95
(D) 1.05<(Re/Rth (650)/(Re/Rth (550))<1.9
wherein Re (λ) represents an in-plane retardation value of the optical resin film with respect to light having a wavelength
of λ nm;
Rth (λ) represents a thickness direction retardation value of the optical resin film with respect to light having a wavelength
of λ nm; and
Re/Rth (λ) represents a ratio of an in-plane retardation value to a thickness direction retardation value of the optical resin
film with respect to light having a wavelength of λ nm (unit: nm).
|