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US 5,344,513 AGranted
Method of manufacturing laminated transparent substrate having birefringence
AssigneeStanley Electric Co., Ltd.
InventorShunji Takenaka
Life of this patent
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Abstract
A method of manufacturing a laminated transparent substrate comprising the steps of sandwiching between transparent glass substrates ionomer resin formed by bridging ethylenemetacryl acid copolymars with sodium ions, to form a laminated structure and sealing it in a reduced pressure atmosphere; applying heat and pressure to said laminated structure; rapidly decreasing the pressure applied to said laminated structure; and then rapidly decreasing the temperature of said laminated structure.
Claims7
A method of manufacturing an optical compensator having a negative anisotropy comprising the successive steps of:
- (a) sandwiching between a pair of transparent substrates an ionomer resin, to form an optical compensator having a negative anisotropy and sealing it in a reduced pressure atmosphere;
- (b) applying heat to and increasing the pressure on said optical compensator;
- (c) while maintaining said optical compensator at a high temperature rapidly decreasing the pressure applied to said optical compensator;
- and thereafter
- (d) quenching and rapidly decreasing the temperature of said optical compensator thereby providing negative anisotropy to said optical compensator.
2 more elements
Dependencies are inferred from the claim text.