EP 1722400 A1 20061115 - LAMP BULB, LAMP BULB WITH REFLECTING MIRROR, AND LIGHTING SYSTEM
Title (en)
LAMP BULB, LAMP BULB WITH REFLECTING MIRROR, AND LIGHTING SYSTEM
Title (de)
LAMPENBIRNE, LAPENBIRNE MIT REFLEXIONSSPIEGEL UND BELEUCHTUNGSSYSTEM
Title (fr)
AMPOULE DE LAMPE, AMPOULE DE LAMPE AVEC MIROIR REFLECHISSANT ET SYSTEME D'ECLARAGE
Publication
Application
Priority
- JP 2005020976 W 20051115
- JP 2004331537 A 20041116
- JP 2004361188 A 20041214
- JP 2005193386 A 20050701
Abstract (en)
To make a filament assembly compact and improve converging efficiency, a lamp to be built into a reflection mirror or a reflection-mirror-equipped lamp of the present invention includes a filament assembly including a plurality of filament elements each formed with a single wound coil. A central filament element is placed such that a coil axis thereof is the same as an optical axis of the reflection mirror, and peripheral filament elements are placed such that winding axes thereof are parallel to the coil axis of the central filament element. An outline of each filament element is substantially noncircular. Also, to improve central luminance and light distribution properties, 0.2‰¤L S /L C ‰¤0.9 is satisfied, where L C is a length of the central filament element and L S is a length of the peripheral filament element. Further, to realize a long life, 0.25‰¤r/R‰¤0.75 is satisfied, where R is a maximum inner diameter of the bulb and r is a maximum outer diameter of the filament assembly.
IPC 8 full level
H01K 1/18 (2006.01); F21Y 101/00 (2016.01)
CPC (source: EP)
H01K 1/14 (2013.01); H01K 1/18 (2013.01); H01K 7/02 (2013.01)
Citation (search report)
See references of WO 2006054563A1
Designated contracting state (EPC)
DE FR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
EP 1722400 A1 20061115; JP 2008288218 A 20081127; JP 4197035 B2 20081217; JP WO2006054563 A1 20080529; WO 2006054563 A1 20060526
DOCDB simple family (application)
EP 05806860 A 20051115; JP 2005020976 W 20051115; JP 2006545076 A 20051115; JP 2008190913 A 20080724