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. 15, 2014
Filed:
May. 22, 2012
Toru Kontani, Hyogo, JP;
Takashi Yamashita, Hyogo, JP;
Toru Kontani, Hyogo, JP;
Takashi Yamashita, Hyogo, JP;
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a discharge lamp lighting apparatus comprising a short arc type discharge lamp and a power supply unit, a relation of the natural frequency f(Hz) of the electrodes, the ripple frequency f(Hz) of the alternating current that is supplied to the discharge lamp, and the ripple power Pr (W) of the alternating current, satisfies a formula: wherein the volume of the electrode head portion is represented as Vh and the volume of the segment of the electrode axis portion that projects into the arc tube is represented as Va. When the alternating current supplied to the discharge lamp satisfies the formula, it is possible to prevent or control damage in the electrode axis portion, since vibration produced in the electrodes during lighting of the discharge lamp is small even if the discharge lamp is lighted for a long time.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile