The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2001
Filed:
Mar. 25, 1999
Hisahi Honda, Yokosuka, JP;
Seiji Ashida, Yokosuka, JP;
Kiyoshi Saita, Yokosuka, JP;
Tatsuo Otabe, Tokyo, JP;
Masuo Shibuya, Yokosuka, JP;
Noriji Watanabe, Yokosuka, JP;
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Abstract
The present invention provides a high-voltage discharge lamp having an internal volume of 0.05 cc or less that is small yet maintains a desirable lifetime and a high luminous efficiency, a high-voltage discharge lamp device using the lamp, and a lighting apparatus using the lamp. The high-voltage discharge lamp comprises a ceramic discharge vessel that has a spherical, bulging section and a pair of small diameter cylindrical sections. The spherical, bulging section surrounds a discharge space. The small diameter cylindrical sections are connected to the ends of the spherical, bulging section. Electrode-integrated power-supplying conductors are used. Each conductor comprises a seal part and a halide-resistant part. The halide-resistant part having a proximal end connected to the distal end of the seal part. The distal end of the halide-resistant part projects into the spherical, bulging section of the translucent ceramic discharge vessel forming an electrode. A narrow gap is provided between the halide-resistant part and the inner surface of the small diameter cylindrical section. A discharge medium containing a metal halide and rare gas are filled in the translucent ceramic discharge vessel. When materials having a high average linear transmittance, such as YAG, are used as light-transmitting ceramics, the luminous efficiency of a small high-voltage discharge lamp will be increased.