Birefringent film with n.sub.x >n.sub.z >n.sub.y, process

Details Birefringent film with n.sub.x >n.sub.z >n.sub.y, process Birefringent film with n.sub.x >n.sub.z >n.sub.y, process

1991-10-23

1993-09-14

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359494, 359500, G02F 11333, G02B 530

Patent

active

052454568

ABSTRACT:
A birefringent film in which molecules oriented in a direction parallel to the film plane and molecules oriented in the direction of the thickness of the film are present in a mixed state. Also, a process for producing the birefringent film, which comprises laminating a resin film on one or both sides thereof with a shrinkable film, thereby preparing a laminate, and then heat stretching the laminate, thereby performing stretching treatment of the resin film while imparting to the resin film the ability to shrink in the direction crossing the stretching direction. A retardation film is formed by using at least one birefringent film and has refractive indexes, n.sub.x and n.sub.y, in two directions parallel to the plate plane and crossing each other at right angles and a refractive index, n.sub.z, in the direction of the thickness of the plate, said refractive indexes n.sub.x, n.sub.y, and n.sub.z satisfying the following equation:

REFERENCES:
patent: 5042924 (1991-08-01), Terasaki et al.
patent: 5093739 (1992-03-01), Aida et al.
patent: 5179456 (1993-01-01), Aizawa et al.
Patent Abstracts of Japan, vol. 14, No. 289 (P-1065), Jun. 21, 1990, Abstract of JP-2089006, published Mar. 29, 1990.

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