Ushio Denki Kabushiki Kaisha

Shinkichi Morimoto

Toshiyuki Shima

Masanori Sugihara

Akiyasu Yamaguchi

Osamu Inoue

Kiyotada Nakamura

Keisuke Ookubo

A short arc lamp in which cylindrical retaining bodies can be easily and reliably attached in upholding parts of the electrodes on a temporary basis and in which also the disadvantages which are caused by an anomalous discharge immediately after starting of lamp operation can be eliminated are achieved in a short arc lamp in which a cathode and an anode opposite one another in an arc tube having side parts on opposite sides, in which the upholding parts of the cathode and anode electrodes are inserted and held in cylindrical retaining bodies, and in which the cylindrical retaining bodies are supported in the shrunken regions of the side tubes by the upholding parts of the electrodes being wound with coil components which border the faces of the cylindrical retaining bodies that face the electrodes, and by the cylindrical retaining bodies being temporarily attached by these coil components. Furthermore, as the coil components, a coil wound which is formed of a flexible foil lead that has been bent in the middle region of the flexible coil lead and wound so that the two ends of the flexible coil lead are located on the side closest to the electrode.

Short arc lamp with crack-preventing electric mounting arrangement

A discharge lamp of the short arc type with good light intensity stability in which arc fluctuation is suppressed is achieved, according to the invention by providing a discharge lamp of the short arc type which has an arc tube which surrounds the discharge space, hermetically sealed portions on the two ends of the arc tube, a cathode and an anode which are arranged opposite one another in the arc tube and which is operated such that the cathode is pointed upward, in by the cathode being supported by an inner lead which is held securely by the hermetically sealed portion, the outside diameter of the cathode being greater than the outside diameter of the inner lead, and by the relationship L.gtoreq.2.5D being satisfied, where D is the outside diameter of the cathode (mm) and L is the axial length of the cathode (mm).

Cathode structure for short arc type discharge lamp

A lamp in which a stable, long-term luminous operation can be accomplished is achieved by the fact that, in a mercury lamp of the short arc type in which a cathode and an anode located next to one another within an arc tube and in which both ends of the arc tube are provided with hermetically sealed portions, the cathode is installed on the tip of a rod-shaped component which extends from a respective one of the hermetically sealed portions, the cathode having a greater outer diameter than the rod-shaped component on which it is installed, and the rear end of the cathode tapering toward the respective hermetically sealed portion.

Growing community of inventors

Himeji, Japan

Shinkichi Morimoto