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:
Nov. 09, 1999
Filed:
Nov. 20, 1997
Shigeru Kashiwagi, Noda, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A dynamic focusing apparatus is comprised of a parabaolic voltage generating device for generating a parabolic voltage VpbI across a capacitor 9M by applying a horizontal flyback pulse a series circuit of an inductor 8 and the capacitor, a coupling device 10 for supplying the parabolic voltage to a focus electrode 'f' of a cathode-ray tube, the capacitor which includes a plurality of capacitors 9S, an electronic switching device 11 for selectively connecting some of the plurality of capacitors for a time duration corresponding to an approximate center of a horizontal period and for disconnecting the some of the plurality of capacitors for other duration, and a switching control device for controlling the electronic switching device.