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. 25, 2007
Filed:
Nov. 22, 2006
Shinji Sugioka, Hyogo, JP;
Shinji Sugioka, Hyogo, JP;
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A discharge lamp lighting apparatus for supplying high frequency high voltage to an excimer discharge lamp comprises a boasting transformer having a core, a secondary side coil and a pair of primary side coils; a DC power source; and switching elements, wherein a duty ratio of an electrically conductive period to an operational cycle of each of the switching elements is 30% or less, a turn ratio of the secondary side coil to each of the primary side coils is 25 or less, a difference between a first length of a first axial direction area where each of the primary side coils are wound, and a second length of a second axial direction area where the secondary side coil is wound, is 18% or less of the first length or the second length, and a leakage inductance associated with magnetic coupling between the primary side coils and the secondary coil is 0.2% to 0.7% of a primary side coil inductance.