Cholesteric polarizer and the manufacture thereof

Details Cholesteric polarizer and the manufacture thereof Cholesteric polarizer and the manufacture thereof

1994-01-10

1996-04-09

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

2522997, 252585, 359 65, 359105, 359500, G02B 530, G02F 11335, C09K 1936

Patent

active

055067042

ABSTRACT:
A broadband cholesteric polarizer is described, as well as a method of manufacturing such a polarizer. Said polarizer comprises an optically active layer of a polymer material having a cholesteric order, said material being oriented so that the axis of the molecular helix extends transversely to the layer. In accordance with the invention, the polarizer is characterized in that the pitch of the molecular helix in the layer is varied in such a manner that the difference between the maximum pitch and the minimum pitch is at least 100 nm. The optically active layers are preferably provided on substrates which bring about a conversion of circularly polarized light into linearly polarized light. Three different methods of manufacturing such broadband polarizers are described.

REFERENCES:
patent: 4410570 (1983-10-01), Kreuzer et al.
patent: 5132147 (1992-07-01), Takiguchi et al.
patent: 5188760 (1993-02-01), Hikmet et al.
"Polarizing Color Filters Made from Cholesteric LC Silicones" Maurer et al, SID 90 Digests, 1990 pp. 110-113.

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