Optical film

Details Optical film Optical film

1992-05-26

1993-09-14

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428212, 428333, 428910, 528205, 359484, 359249, B32B 300

Patent

active

052447138

ABSTRACT:
An optical film having high optical uniformity is disclosed, including a thermoplastic resin film having no periodic thickness variation of sine waveform having a pitch of 50 mm or less and a thickness change of 0.5 .mu.m or more on continuous thickness measurement in the machine direction, and an optical film having a retardation value of 1200 nm or less with a fluctuation of not more than 10% and a rate of change of not more than 1.3%/cm, which is obtained by stretching said thermoplastic resin film. The optical film is laminated on a polarizing sheet to serve as a phase retarder.

REFERENCES:
patent: 4461888 (1984-07-01), Rogers et al.
patent: 4536240 (1985-08-01), Winn

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