Stanley Electric Co., Ltd

Hiroharu Shimada

Masaaki Muto

Yasuhisa Yaguchi

Isamu Sato

Shinya Omori

Yoshifumi Takao

Toshiyuki Nagahara

Naoyuki Matsubara

Shigeru Shibayama

The invention provides an arc tube with improved chromaticity and start-up characteristics that does not contain mercury, and provides a vehicle headlamp equipped with a metal halide lamp that contains no mercury in the arc tube. Among other improvements, the evaporation of low melting point metal halides is promoted and the start-up characteristics of the arc tube are improved.

Discharge lamp

In a method for manufacturing small tubular lamps, a moving amount of a tube stock is adjusted according to a wall thickness thereof to make the stock-guide amount uniform, and the internal pressure during the stock-guide step is also adjusted so as to produce a suitable dimension of the outside diameter thereof, whereby the working amount in the succeeding step is reduced to decrease errors in dimensional tolerances, particularly in wall thickness and internal volume.

Method for manufacturing small tubular lamps

Growing community of inventors

Tokyo, Japan

Hiroharu Shimada