Patent ID: 6133676
Filing Date: 2000-10-17
Classification: H01K

Abstract:
A double-enveloped halogen bulb comprising a tubular halogen bulb having two conductive ends, a hollow glass envelope, and a socket for securing said tubular halogen bulb in said glass envelope such that said two conductive ends are connected electrically with two different portions of said socket, said tubular halogen bulb further having a quartz envelope, a metal filament located in said quartz envelope such that both ends of said metal filament are sealed at both ends of said quartz envelope and electrically connected to said two conductive ends separately, and a halogen mixture contained in said quartz envelope, said glass envelope having a thickness ranging between 2 mm and 8 mm, wherein said glass envelope has a neck provided at one end thereof with an opening and at another end thereof with a head, wherein said socket has a hollow columnar body having an opening at one end, and a closed end member fixedly connected to another end of said hollow columnar body; wherein said opening end of said neck of said glass envelope is received in said hollow columnar body via said opening of said hollow columnar body, wherein one of said two conductive ends or a lead connected to said one of said two conductive ends of said tubular halogen bulb is electrically connected to a first electrode provided on said closed end member of said hollow columnar body, and another one of said two conductive ends of said tubular halogen bulb is electrically connected to a second electrode provided on said hollow columnar body with another lead, and wherein one end of the said another lead is connected to said another end of said two conductive ends of said tubular halogen bulb, and said another end of said another lead is bent over an edge of the opening end of said neck and received in a first groove formed on the outer surface of the neck, so that said tubular halogen bulb is secured in said glass envelope when said opening end of said neck of said glass envelope is received in said hollow columnar body via said opening of said hollow columnar body of said socket, wherein said glass envelope has an outer surface which is opposite to said socket and is provided with a plurality of cylindrical protuberances or striplike protuberances perpendicular to said outer surface having a height ranging between 3 mm and 10 mm.