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. 13, 2005
Filed:
Apr. 06, 2001
Yukio Yamanaka, Osaka, JP;
Nobukazu Miki, Osaka, JP;
Tadahiro Kono, Osaka, JP;
Toshihiro Nishida, Osaka, JP;
Yoshikazu Kado, Osaka, JP;
Yukio Yamanaka, Osaka, JP;
Nobukazu Miki, Osaka, JP;
Tadahiro Kono, Osaka, JP;
Toshihiro Nishida, Osaka, JP;
Yoshikazu Kado, Osaka, JP;
Matsushita Electric Works, Ltd., Kadoma, JP;
Abstract
An electronic ballast for a discharge lamp has a compact arrangement of electric parts. The ballast includes an AC-DC converter and an inverter giving a high frequency output voltage for operating the lamp. The inverter includes switching elements, a control circuit, and an output transformer for connection with the lamp. A single circuit board mounts the electric parts forming the converter and the inverter. The circuit board is accommodated within a tubular casing together with a dielectric sheet which is provided for insulating the circuit board as well as the electric parts from the casing. The output transformer is mounted on a top surface of the circuit board together with some of the other electric parts. The ballast includes chip components forming a detection circuit for lamp condition, and the circuit board mounts the chip components on a bottom surface at a location immediately opposite of the output transformer.