EP 0547077 A4 19940216 -
Publication
Application
Priority
- US 57722090 A 19900831
- US 59847690 A 19901016
- US 67776991 A 19910329
Abstract (en)
[origin: WO9204653A1] A tunable liquid-crystal etalon filter comprising two dielectric stack mirrors (18, 20) defining an optical cavity into which is filled a liquid crystal (26). Electrodes (14, 16) disposed on the outsides of the mirrors apply an electric field to the liquid crystal, changing its refractive index and thereby changing its optical length. Thereby, the optical pass band of the filter can be electrically changed in a low-powered, compact, rugged, and economical structure.
IPC 1-7
IPC 8 full level
G01J 3/26 (2006.01); G02F 1/01 (2006.01); G02F 1/13 (2006.01); G02F 1/137 (2006.01); G02F 1/21 (2006.01); H04B 10/135 (2006.01); H04B 10/25 (2013.01); G02F 1/139 (2006.01)
CPC (source: EP)
G02F 1/216 (2013.01); H04B 10/25 (2013.01); G02F 1/139 (2013.01); G02F 1/213 (2021.01); G02F 2203/055 (2013.01); G02F 2203/06 (2013.01)
Citation (search report)
- [PYPA] US 4973124 A 19901127 - KAEDE KAZUHISA [JP]
- [A] PATENT ABSTRACTS OF JAPAN vol. 8, no. 242 (P - 311) 7 November 1984 (1984-11-07)
- See references of WO 9204653A1
Designated contracting state (EPC)
FR GB NL
DOCDB simple family (publication)
WO 9204653 A1 19920319; CA 2088372 A1 19920301; CA 2088372 C 19991005; EP 0547077 A1 19930623; EP 0547077 A4 19940216; JP 2587743 B2 19970305; JP H06500408 A 19940113
DOCDB simple family (application)
US 9105609 W 19910807; CA 2088372 A 19910807; EP 91914812 A 19910807; JP 51364791 A 19910807