Title:
PRODUCTION OF PHASE DIFFERENCE PLATE
Document Type and Number:
Japanese Patent JPH05288932
Kind Code:
A
Abstract:
PURPOSE:To provide the process which can easily produce the phase difference plate having phase difference compensation performance uniform and excellent over approximately the entire area of a film and visual field angle characteristic. CONSTITUTION:A polysulfone film p is so molded that the sectional shape in its longitudinal direction has a waveform; in addition, both ends in the transverse direction of this film are fixed in the state of maintaining this waveform shape and thereafter, the film is subjected to a stretching treatment in a transverse uniaxial direction while the free shrinkage in the longitudinal direction exclusive of its fixed parts is permitted, by which the phase difference plate is produced. The film is subjected to the stretching in the state of fixing both ends in the transverse direction of the film while maintaining the waveform shape and, therefore, the partial shrinkage (neck-in) in the transverse direction of the film does not arise and the shrinkage uniform in the longitudinal direction is enabled until the waveform shape attains a flat shape. The reduction rate in the longitudinal direction is thus controlled constant.
Inventors:
TABATA HIRONORI
MATSUMOTO HIDESHI
MATSUMOTO HIDESHI
Application Number:
JP8534492A
Publication Date:
November 05, 1993
Filing Date:
April 07, 1992
Export Citation:
Assignee:
SEKISUI CHEMICAL CO LTD
International Classes:
B29C55/04; G02B5/30; B29L7/00; (IPC1-7): G02B5/30; B29C55/04