EP 0402740 B1 19950111 - Reflector for a lamp and method to determine the shape of a reflector.
Title (en)
Reflector for a lamp and method to determine the shape of a reflector.
Title (de)
Reflektor für eine Leuchte und Verfahren zum Bestimmen der Form eines Reflektors.
Title (fr)
Réflecteur pour lampe et procédé pour déterminer sa forme.
Publication
Application
Priority
DE 3919334 A 19890613
Abstract (en)
[origin: JPH0330204A] PURPOSE:To obtain the desired luminous intensity distribution and unify the illuminance distribution in a pattern to be irradiated by forming the sectional form of a reflector with a no-conic curve. CONSTITUTION:A sectional curve R is obtained by connecting multiple coordinate points obtained on the basis of a distance between intersections of two conic curves E1, E2 crossing a straight line 2 and a distance function, and thereafter, the sectional curve R is dislocated three dimensionally to obtain a solid shape, and the sectional form of a reflector is formed with no-conic curve. The reflection characteristic thereof is thereby different from a conventional reflector using a conic curve, and the illuminance distribution of an irradiated pattern is unified, and furthermore, a boundary of the pattern is appeared clear.
IPC 1-7
IPC 8 full level
F21V 7/00 (2006.01); F21V 7/04 (2006.01); F21V 7/09 (2006.01); G02B 5/10 (2006.01)
CPC (source: EP US)
F21V 7/04 (2013.01 - EP US); F21V 7/09 (2013.01 - EP US); Y10S 359/90 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0402740 A2 19901219; EP 0402740 A3 19911211; EP 0402740 B1 19950111; EP 0402740 B2 19980715; DE 3919334 A1 19901220; DE 59008220 D1 19950223; JP H0330204 A 19910208; JP H0738285 B2 19950426; US 5136491 A 19920804
DOCDB simple family (application)
EP 90110622 A 19900605; DE 3919334 A 19890613; DE 59008220 T 19900605; JP 15254690 A 19900613; US 53642390 A 19900612