Optical elements based on liquid-crystalline substances with no birefringence in a non-perpendicular direction and a process for their preparation

US5359439A · kind A · utility

Assignee

• Consortium für elektrochemische Industrie GmbH · DE

Inventors

• Alfred Miller · Martinsried, DE
• Horst Leigeber · Oberhaching, DE
• Franz-Heinrich Kreuzer · Martinsried, DE

Key dates

• Filing date: Feb 1, 1993
• Grant date: Oct 25, 1994
• Expiry date: Feb 1, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/1337
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to optical elements based on liquid-crystalline substances, and to a process for the production thereof. The optical elements based on liquid-crystalline substances are ones which exhibit no birefringence in a defined direction of incidence, optical elements in which no birefringence occurs perpendicularly to the surface being excepted. The process for preparing the optical elements comprises illuminating a liquid-crystalline substance with unpolarized light of suitable wavelength at a defined angle in such a way that, after illumination, the director of this substance is aligned parallel to the direction of the illuminating light on passing through said substance.