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:
Jun. 07, 2005
Filed:
Nov. 13, 2001
Yoshitaka Ohshima, Shizuoka, JP;
Shinichi Irisawa, Shizuoka, JP;
Akihiro Nagata, Shizuoka, JP;
Hiroshi Goto, Shizuoka, JP;
Yoshitaka Ohshima, Shizuoka, JP;
Shinichi Irisawa, Shizuoka, JP;
Akihiro Nagata, Shizuoka, JP;
Hiroshi Goto, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
An arc tube bodyand a foil such as molybdenum foilare joined with each other such that a compressive stress of 10N/mor more remains at an ordinary temperature in the arc tube bodyalong a junction surface. The compressive stress is always generated on the arc tube bodyeven if a fluctuation in the stress is caused on the junction surface by the repetition of the ON/OFF of the arc tube (or a tensile stress is caused to have a very small value even if the compressive stress and the tensile stress are alternately generated). Thus, the junction strength of both members may be increased. In one embodiment, a plurality of cracks (intercrystalline cracks) may be generated on the molybdenum foilby a high pressure acting during pinch seal, and quartz glass is caused to enter the cracks so that the junction strength of both members can be increased.