EP 1034397 A1 20000913 - FLAT LIGHTING DEVICE
Title (en)
FLAT LIGHTING DEVICE
Title (de)
FLACHE BELEUCHTUNGSVORRICHTUNG
Title (fr)
DISPOSITIF D'ECLAIRAGE PLAT
Publication
Application
Priority
- DE 9902881 W 19990911
- DE 19844921 A 19980930
- DE 19905219 A 19990209
Abstract (en)
[origin: WO0019144A1] The invention relates to a flat lighting device (8; 32) comprising an aperture fluorescent lamp (33), an optical system (10; 34) and a light-conducting plate (11; 35). The optical system (10; 34) influences the distribution of the light to be coupled into the light-conducting plate in a targeted manner such that in the cross-sectional plane of the tubular discharge vessel of the lamp the light distribution has at least one maximum in the angular separation ( beta , in relation to the optical axis A, where said angular separation ( beta satisfies the relationship (I), in which L is the longitudinal dimension of the light-conducting plate (i.e. its dimension in the direction of the optical axis A and d is the thickness of said plate. In this way a high luminance is obtained at the front side (39) of the light-conducting plate.
IPC 1-7
IPC 8 full level
F21V 8/00 (2006.01); G02F 1/13357 (2006.01); G09F 9/00 (2006.01); H01J 65/00 (2006.01); F21Y 103/00 (2006.01); G02B 6/00 (2006.01)
CPC (source: EP KR US)
G02B 6/002 (2013.01 - EP US); G02B 6/0071 (2013.01 - EP US); G02B 27/18 (2013.01 - KR); G02B 6/0031 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FI FR GB IT LI NL
DOCDB simple family (publication)
WO 0019144 A1 20000406; CA 2312225 A1 20000406; CA 2312225 C 20080715; CN 1105855 C 20030416; CN 1287604 A 20010314; DE 19905219 A1 20000831; EP 1034397 A1 20000913; HU 224262 B1 20050728; HU P0004329 A2 20010428; HU P0004329 A3 20030728; JP 2002525837 A 20020813; KR 100389505 B1 20030625; KR 20010032605 A 20010425; TW 518404 B 20030121; US 6454451 B1 20020924
DOCDB simple family (application)
DE 9902881 W 19990911; CA 2312225 A 19990911; CN 99801725 A 19990911; DE 19905219 A 19990209; EP 99969781 A 19990911; HU P0004329 A 19990911; JP 2000572614 A 19990911; KR 20007005880 A 20000530; TW 88116405 A 19990923; US 55504300 A 20000524