| 摘要 |
A phase contrast plate comprising one sheet of cellulose ester film, characterized as exhibiting a Re450, which is a retardation value as measured at a wave length of 450 nm, of 100 to 125 nm and a Re590, which is a retardation value as measured at a wave length of 590 nm, of 120 to 160 nm, with the proviso that the two values satisfy the relationship: Re590 - Re450≥2nm. In order to satisfy lambda /4 in such a wide region of wave length, an aromatic compound having at least two aromatic rings is added to the cellulose ester film as a retardation-increasing agent. In a same manner, lambda /2 can be satisfied in a wide region of wave length. <IMAGE> |
