Global Patent Index - EP 1072173 A1

EP 1072173 A1 2001-01-31 - 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

EP 1072173 A1 (DE)

Application

EP 99960894 A

Priority

  • DE 9903591 W
  • DE 19858810 A

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 (main, further and additional classification)

H05B 41/392; F21V 8/00; G09G 3/34

IPC 8 full level (invention and additional information)

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 (invention and additional information)

G02B 6/0071 (2013.01)

Citation (search report)

See references of WO 0038482A1

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI NL

EPO simple patent family

DE 19858810 A1 20000629; CA 2320760 A1 20000629; EP 1072173 A1 20010131; JP 2002533885 A 20021008; TW 522207 B 20030301; US 6390637 B1 20020521; WO 0038482 A1 20000629

INPADOC legal status


2004-05-19 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): AT BE CH DE FR GB IT LI NL

2003-09-10 [18W] WITHDRAWN

- Effective date: 20030710

2003-06-11 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030425

2001-01-31 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000523

2001-01-31 [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