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:
May. 22, 2012
Filed:
Jun. 09, 2009
Toshio Yoshizawa, Gyoda, JP;
Katsuhiro Okabe, Gyoda, JP;
Makoto Ohkahara, Gyoda, JP;
Nobuo Fukuda, Gyoda, JP;
Shigeharu Sato, Gyoda, JP;
Shinichi Takemasa, Gyoda, JP;
Toshio Yoshizawa, Gyoda, JP;
Katsuhiro Okabe, Gyoda, JP;
Makoto Ohkahara, Gyoda, JP;
Nobuo Fukuda, Gyoda, JP;
Shigeharu Sato, Gyoda, JP;
Shinichi Takemasa, Gyoda, JP;
Iwasaki Electric Co., Ltd., Chuo-ku, Tokyo, JP;
Abstract
Provided is a manufacturing method to prevent devitrification of a bulb in a high pressure discharge lamp used for a projector. The method is for manufacturing a high pressure discharge lamp which uses, as a light source, a bulb made of fused quartz and including a tungsten electrode, and which is horizontally installed when the lamp is driven for actual use. The method includes the step of initially driving the bulb with an optical axis thereof being set horizontally before the high pressure discharge lamp is shipped. In the initial driving step, the rotation angle around the optical axis of the bulb is offset by 45° or more and 135° or less relative to the rotation angle around the optical axis of the bulb when the lamp is driven for actual use.