Global Patent Index - EP 1015812 A1

EP 1015812 A1 2000-07-05 - 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

EP 1015812 A1 (EN)

Application

EP 98938809 A

Priority

  • GB 9802434 W
  • GB 9717267 A

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 (main, further and additional classification)

F21V 9/10; G02F 1/133

IPC 8 full level (invention and additional information)

F21S 8/00 (2006.01); F21V 9/10 (2006.01); F21V 14/00 (2006.01); F21V 29/00 (2006.01); F21V 9/06 (2006.01); F21V 21/30 (2006.01)

CPC (invention and additional information)

F21V 29/70 (2013.01); F21V 9/10 (2013.01); F21V 9/14 (2013.01); F21V 14/003 (2013.01); F21V 29/004 (2013.01); F21V 29/74 (2013.01); F21V 29/85 (2013.01); F21V 9/06 (2013.01); F21V 21/30 (2013.01); F21W 2131/406 (2013.01)

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

EPO simple patent family

WO 9909351 A1 19990225; AU 8740898 A 19990308; EP 1015812 A1 20000705; GB 9717267 D0 19971022

INPADOC legal status


2002-11-06 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020426

2000-11-15 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000928

2000-10-18 [RIN1] INVENTOR (CORRECTION)

- Inventor name: ANDERSON, DAVID

2000-10-18 [RIN1] INVENTOR (CORRECTION)

- Inventor name: HAJTO, JANOS

2000-10-18 [RIN1] INVENTOR (CORRECTION)

- Inventor name: THOMSON, IAN

2000-07-05 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000306

2000-07-05 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE