EP 1072173 A1 20010131 - FLAT LIGHTING DEVICE AND METHOD FOR OPERATING
Title (en)
FLAT LIGHTING DEVICE AND METHOD FOR OPERATING
Title (de)
FLACHE BELEUCHTUNGSVORRICHTUNG UND BETRIEBSVERFAHREN
Title (fr)
DISPOSITIF D'ECLAIRAGE PLAT ET PROCEDE POUR LE FAIRE FONCTIONNER
Publication
Application
Priority
- DE 9903591 W 19991111
- DE 19858810 A 19981221
Abstract (en)
[origin: DE19858810A1] The invention relates to a flat lighting device (1) comprising a light-conducting plate (2) and at least two electrical light sources (3, 4) which can be used to couple light into a light-conducting plate (2). A first light source (3) is adjacent to the light-conducting plate (2) and a second light source (4) is arranged behind the first light source (3), as seen from the light-conducting plate (2), in such a way that the light which is emitted from the second light source (4) during operation can enter at least partially the light-conducting plate (2) by traversing the first light source (3). In dimming operation, the first light source (3) which is closest to the light-conducting plate (2) is switched off and softens the light flux which is to be coupled from the second light source (4) into the light-conducting plate (2). In this way, extreme dimming is possible without the light source changing its electrical or luminous characteristics.
IPC 1-7
IPC 8 full level
F21V 8/00 (2006.01); H01J 61/16 (2006.01); H01J 61/30 (2006.01); H01J 65/00 (2006.01); F21Y 103/37 (2016.01)
CPC (source: EP KR US)
G02B 6/0071 (2013.01 - EP US); H05B 41/392 (2013.01 - KR)
Citation (search report)
See references of WO 0038482A1
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL
DOCDB simple family (publication)
DE 19858810 A1 20000629; CA 2320760 A1 20000629; EP 1072173 A1 20010131; JP 2002533885 A 20021008; KR 20010041166 A 20010515; TW 522207 B 20030301; US 6390637 B1 20020521; WO 0038482 A1 20000629
DOCDB simple family (application)
DE 19858810 A 19981221; CA 2320760 A 19991111; DE 9903591 W 19991111; EP 99960894 A 19991111; JP 2000590436 A 19991111; KR 20007009216 A 20000821; TW 88120726 A 19991126; US 62247600 A 20000817