EP 1015812 A1 20000705 - LIQUID CRYSTAL SHUTTER FOR A LIGHTING FIXTURE
Title (en)
LIQUID CRYSTAL SHUTTER FOR A LIGHTING FIXTURE
Title (de)
FLÜSSIGKRISTALL-LICHTVERSCHLUSS FÜR EINE BELEUCHTUNGSEINRICHTUNG
Title (fr)
OBTURATEUR A CRISTAUX LIQUIDES POUR DISPOSITIF D'ECLAIRAGE
Publication
Application
Priority
- GB 9802434 W 19980813
- GB 9717267 A 19970814
Abstract (en)
[origin: WO9909351A1] The present invention concerns a high intensity luminaire (15) for stage, theatre and architectural illumination, comprising: means for mounting a high intensity light source (35); an optical system for focusing light from a mounted high intensity light source through an exit aperture of the luminaire; a liquid crystal (LC) panel (70) mounted in the optical path of the luminaire; means for applying a variable voltage to said crystal panel; dichroic means (144) adapted to reduce the effect of heat generated in operation by the high light source on the operation of said panel; and means for controlling the contrast ratio of light emitted by said panel in response to variable ambient conditions; said control means comprising means for providing feedback to said panel either in response to the measured temperature of the panel or to measured contrast ratio of light transmitted through the panel.
IPC 1-7
IPC 8 full level
F21S 8/00 (2006.01); F21V 9/10 (2006.01); F21V 9/40 (2018.01); F21V 14/00 (2006.01); F21V 29/00 (2006.01); F21V 9/06 (2006.01); F21V 21/30 (2006.01)
CPC (source: EP US)
F21V 9/14 (2013.01 - EP); F21V 9/40 (2018.01 - EP US); F21V 14/003 (2013.01 - EP); F21V 29/70 (2015.01 - US); F21V 29/74 (2015.01 - EP); F21V 29/85 (2015.01 - EP); F21V 9/06 (2013.01 - EP US); F21V 21/30 (2013.01 - EP); F21W 2131/406 (2013.01 - EP)
Citation (search report)
See references of WO 9909351A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9909351 A1 19990225; AU 8740898 A 19990308; EP 1015812 A1 20000705; GB 9717267 D0 19971022
DOCDB simple family (application)
GB 9802434 W 19980813; AU 8740898 A 19980813; EP 98938809 A 19980813; GB 9717267 A 19970814