Mitsubishi Denki Kabushiki Kaisha

Yoshiteru Taniguchi

Hiroshi Ito

Hitoshi Yamazaki

Jun Imai

Takao Takeda

Norihiko Tanaka

Minoru Uchida

A process is disclosed which prepares a low pressure mercury vapor discharge lamp having a bulb and an end plate connected to the bottom of the bulb. The steps involve the application of an adhesive on one surface of the end plate, and the subsequent insertion of an exhaust tube into the end plate in such a way that an enlarged diameter portion of the exhust tube has an adhesive formed on this portion. As a result of the location and the structure of the steps, it is possible to provide a single step method of heating which functions to perform the essential bonding of all parts.

Low pressure mercury vapor discharge lamp and preparation thereof

A low pressure mercury vapor discharge lamp forms an electric discharge path by the use of a bulb placed on an end plate and the bulb is formed by a process which results in the connecting outer side surfaces of juxtaposed glass tubes through communication holes formed in the outer side surfaces respectively. The process involves placing the juxtaposed glass tubes so that their outer surfaces are opposed in a contacting state. A portion of each of the glass tubes is heated in order to form a communication hole through the utilization of a burner inserted through an open end into the interior of each of the glass tubes in order to cause fusion of that particular portion in each tube to thereby form the communication hole by wind pressure. A mass of molten glass is then forced outward at the outer peripheral edge of the communication hole whereby these outer peripheral edges of the glass tubes are mutually connected by the mass of molten glass and the open end of the tubes are then closed to form a U-shaped passage between the tubes.

Method for making low pressure mercury vapor discharge lamp

Growing community of inventors

Kamakura, Japan

Yoshiteru Taniguchi