Toshiba Lighting & Technology Corporation

Mamoru Furuya

Hiromichi Kawashima

Kazuo Honda

Yasuki Mori

Masakazu Shibuya

Ichiro Tanaka

Yasuhiro Iwafuji

Youichiro Mitsuyuki

Nanao Murase

A DC glow discharge lamp is disclosed, in which one the pinch seal portions of an arc tube of quartz glass with an anode and a cathode arranged therein in opposed relation to each other is bonded to a base by means of a ceramic adhesive containing a binder, and a conductive member connected around the cathode-side pinch seal portion is mounted in such a manner as to assume the same potential as the cathode. Even in the case where the binder mixed in the ceramic adhesive for improving the bonding strength is vaporized, it attaches to the conductive member and assumes a negative potential and thus is prevented from attaching to the cathode-side pinch seal portion. The devitrification of the pinch seal portion or the leakage therefrom which otherwise might occur due to the binder are thus suppressed, thereby providing a DC glow discharge lamp with an improved service life.

DC glow discharge lamp, and ignition apparatus, flood-light apparatus

High intensity spotlight

A prescribed amount of tin halide is sealed in the arc tube of a metal halide lamp wherein a given amount of metal halide including a target amount of halogen and at least a predetermined amount of rare earth metal is sealed in the arc tube thereof to maintain a high lumen maintenance factor for an extended operation period. The prescribed amount of tin halide is preferably within 4.6.about.234 mol % of the predetermined amount of rare earth metal.

Metal halide lamp maintaining a high lumen maintenance factor over an

Growing community of inventors

Miura, Japan

Mamoru Furuya