Patent ID: 6435696
Filing Date: 2002-08-20
Classification: F21V,H01J,H01K

Abstract:
An electric light bulb of the type presenting a longitudinal axis and having a longitudinal filament disposed at least approximately on said axis and suitable for emitting light when it is electrically powered, and a glass enclosing the filament and presenting around it at least for the most part an outer peripheral face that is at least approximately circularly cylindrical about the axis,the bulb being characterized in that it further comprises, outside the glass, a mirror having a concave reflecting surface which is placed locally in contact with the glass and via which the mirror is directly secured to the outer peripheral face of the glass, which reflecting surface is defined by longitudinal generator lines and presents a cross-section different from the cross-section of the outer peripheral face of the glass, which section is selected and disposed relative to the axis in such a manner that the reflecting surface is tangential to the outer peripheral face of the glass along a common longitudinal generator line, and relative to the filament in such a manner that the reflecting surface concentrates the light emitted by the filament when it is electrically powered into a beam of predetermined orientation and flare angle.