Toshiba Lighting & Technology Corporation

Jyunichi Nakajima

Katsuyuki Ide

Hitoshi Imamura

Shigeru Okada

A discharge lamp comprises a cylindrical lamp casing substantially formed of a metallic material, a transparent glass plate air-tightly fitted to one of the opened end of the lamp casing, a sealing stem air-tightly closing the other opened end of the lamp casing, and a pair of cathode and anode elements sealed in the lamp casing together with discharge gas. The lower portion of the lamp casing may be made in square or circular structure and may be composed of a metallic cylindrical portion extending to a half way of an axial length of the cylindrical lamp casing and a cylindrical transparent glass portion tightly surrounding the outer periphery of the metallic cylindrical portion of the further extending portion and having a front end extending to the sealing stem closing the other end of the lamp casing. The discharge lamp further comprises a member for regulating discharge generated between the paired cathode and anode elements and the interior of the discharge regulating member is divided into a plurality of luminous chambers so that the discharge lamp operates as a fluorescent lamp. The improved structure of the discharge regulating member can improve the light distribution characteristic of the fluorescent lamp.

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Tokyo, Japan

Jyunichi Nakajima