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:
Mar. 18, 2008
Filed:
Jun. 01, 2007
Akihiro Fujii, Shizuoka, JP;
Toru Hirohashi, Shizuoka, JP;
Nobuaki Ito, Shizuoka, JP;
Kiyoshi Hironaka, Shizuoka, JP;
Katsuo Yamada, Shizuoka, JP;
Akihiro Sudo, Aichi, JP;
Kenichiro Suzuki, Shizuoka, JP;
Akihiro Fujii, Shizuoka, JP;
Toru Hirohashi, Shizuoka, JP;
Nobuaki Ito, Shizuoka, JP;
Kiyoshi Hironaka, Shizuoka, JP;
Katsuo Yamada, Shizuoka, JP;
Akihiro Sudo, Aichi, JP;
Kenichiro Suzuki, Shizuoka, JP;
FDK Corporation, Tokyo, JP;
Abstract
Variation in inductance and leakage inductance between the secondary windings is reduced thereby making lamp currents uniform and thus preventing the occurrence of uneven brightness. A two-output inverter transformer comprises a bobbin having a primary winding wound around the middle and secondary windings wound on both sides thereof and having a pole-like core inserted into its winding shaft. A rectangle frame-like core is placed to surround the primary and secondary windings such that the pole-like core is opposite the rectangle frame-like core with a gap sheet interposed at either end. Their sizes are set such that L−L2 t, where Lis the length of the rectangle frame-like core, Lis the length of the pole-like core, and t is the thickness of the gap sheet, and they are so combined that the pole-like core protrudes evenly from the opposite ends of the rectangle frame-like core.