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:
Sep. 11, 2012
Filed:
Feb. 02, 2010
Tetsuo Terashima, Chino, JP;
Kazuo Okawa, Matsumoto, JP;
Tetsuo Terashima, Chino, JP;
Kazuo Okawa, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
In at least one embodiment of the disclosure, a discharge lamp lighting device includes a discharge lamp driving unit that drives a discharge lamp by supplying an AC driving current to the discharge lamp. A memory unit is configured to store driving parameters for the AC driving current. A control unit is configured to control the discharge lamp driving unit based on the driving parameters stored in the memory unit. The driving parameters comprise a range of holding time values, each holding time value representing a time period in which the AC driving current is to be continuously maintained at a same polarity. Upon a predetermined time condition, the control unit selects one of the holding time values based on a predetermined probability and controls the discharge lamp driving unit based on the selected holding time value.