EP 0580631 B1 19970507 - LAMP COVER, IN PARTICULAR FOR FLUORESCENT LAMPS
Title (en)
LAMP COVER, IN PARTICULAR FOR FLUORESCENT LAMPS
Title (de)
LEUCHTENABDECKUNG, INSBESONDERE FÜR LEUCHTSTOFFLAMPEN
Title (fr)
COUVERCLE DE LAMPE, EN PARTICULIER POUR TUBES FLUORESCENTS
Publication
Application
Priority
- DE 9104316 U 19910410
- EP 9200684 W 19920327
Abstract (en)
[origin: US5486990A] PCT No. PCT/EP92/00684 Sec. 371 Date Dec. 8, 1993 Sec. 102(e) Date Dec. 8, 1993 PCT Filed Mar. 27, 1992 PCT Pub. No. WO92/18805 PCT Pub. Date Oct. 29, 1992.A lamp cover in particular for fluorescent lamps consists of a light-transmitting material which at least on one surface features a structure which affects the rays of light that penetrate the material. The present lamp cover is to achieve a soft-focus effect, i.e. light-impervious elements located in the ray path should not be recognizable from the outside. In addition, the lamp cover should have a light-directing effect whereby in the polar diagram in terms of inensity the direction of the light beam hitting the structure in essence has the same direction as the light beam exiting the structure whereby the exiting light beam features a ray expansion. At least on one side of the lamp cover, the surface features a wavelike structure whereby this wavelike structure stretches perpendicularly to the longitudinal axis of the lamp cover and the number of wave trains is in the neighborhood of at least three, preferably ten and maximum a thousand per lamp width, and whereby the wave trains are constantly changing curves whereby these curves are either sine curves or constantly changing radius curves.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
F21S 8/02 (2013.01 - EP US); F21S 8/04 (2013.01 - EP US); F21V 3/04 (2013.01 - EP US); F21V 5/002 (2013.01 - EP US); F21Y 2103/00 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
US 5486990 A 19960123; AT E152820 T1 19970515; DE 59208463 D1 19970612; DE 9104316 U1 19910613; EP 0580631 A1 19940202; EP 0580631 B1 19970507; WO 9218805 A1 19921029
DOCDB simple family (application)
US 13301693 A 19931208; AT 92907486 T 19920327; DE 59208463 T 19920327; DE 9104316 U 19910410; EP 9200684 W 19920327; EP 92907486 A 19920327