Sughrue, Mion, Zinn, Macpeack and Seas
High pressure discharge lamp
 A high pressure discharge lamp in which the restriking voltage and time are significantly decreased. A pair of electrodes are sealably disposed in a tube containing an appropriate amount of mercury. Means is provided for heating at least one of the electrodes for starting the lamp if it has been recently turned off and the mercury vapor pressure inside the tube is high. The heating means is preferably a filament made of a thermally stable material. One terminal of the filament may be connected to one of the electrodes. 
Mitsubishi Denki Kabushiki Kaisha
H
H01J
inventional
Ryo Heiji Masato Michihiro
Suzuki Watanabe Saito Tsuchihashi