EP 1586813 A1 20051019 - Light box
Title (en)
Light box
Title (de)
Leuchtkasten
Title (fr)
Boîte à lumière
Publication
Application
Priority
EP 04076121 A 20040416
Abstract (en)
A light box (1) is disclosed, comprising an optical cavity (3) and at least one elongated light source (4), the at least one light source (4) being arranged to direct light into the optical cavity (3) from an associated edge thereof, the optical cavity (3) comprising a first major face (5) comprising a prismatic micro-structured transparent material (51) to reflect part of the light from the at least one light source (4) back into the optical cavity (3), and to refract part of the light from the at least one light source (4) out of the light box (1), and an opposed reflective second major face to reflect the light from the at least one light source (4) back into the optical cavity (3), characterized in that said prismatic micro-structured transparent material (51) of the first major face comprises at least two portions (51a-d), the prismatic micro-structures of a first portion being not parallel to the prismatic micro-structures of a second portion. In such a way, control of uniformity of luminosity/illumination and glare can be improved.
IPC 1-7
IPC 8 full level
F21S 8/02 (2006.01); F21S 8/04 (2006.01); F21V 3/00 (2006.01); F21V 5/00 (2006.01); F21V 5/02 (2006.01); F21V 17/10 (2006.01)
CPC (source: EP US)
F21S 8/02 (2013.01 - EP); F21S 8/04 (2013.01 - EP); F21V 3/00 (2013.01 - EP); F21V 5/002 (2013.01 - EP US); F21V 5/02 (2013.01 - EP US); F21V 17/101 (2013.01 - EP); F21Y 2103/00 (2013.01 - EP US); F21Y 2103/10 (2016.07 - EP US); F21Y 2115/10 (2016.07 - EP US)
Citation (applicant)
- EP 0293182 A2 19881130 - MINNESOTA MINING & MFG [US]
- EP 0308828 A2 19890329 - CANON KK [JP]
- EP 0377309 A2 19900711 - MINNESOTA MINING & MFG [US]
- EP 0490279 A2 19920617 - MINNESOTA MINING & MFG [US]
- WO 9429765 A1 19941222 - MINNESOTA MINING & MFG [US]
- WO 0171248 A1 20010927 - 3M INNOVATIVE PROPERTIES CO [US], et al
- GB 2310525 A 19970827 - REVELL RONNIE [GB], et al
- WO 0223084 A1 20020321 - MINNESOTA MINING MFG ITALIA [IT], et al
- Thin Light Box by Minnesota Mining and Manufacturing Company, March 1990 (St.Paul Minnesota, USA)
Citation (search report)
- [A] US 3209137 A 19650928 - STAHLHUT LEO G
- [A] US 2050429 A 19360811 - DOREY WILLIAM A, et al
- [A] US 5530628 A 19960625 - NGAI PETER Y Y [US]
- [A] FR 722673 A 19320323 - HOLOPHANE SA
- [A] US 4462068 A 19840724 - SHADWICK JAN [US]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1586813 A1 20051019; EP 1740880 A1 20070110; WO 2005106321 A1 20051110
DOCDB simple family (application)
EP 04076121 A 20040416; EP 05729222 A 20050314; US 2005008573 W 20050314