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:
Aug. 07, 1984
Filed:
May. 20, 1982
Junichi Yamanaka, Sagamihara, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A focusing current or voltage applied to a focusing coil or focusing electrode to focus an electron beam on a target of a camera tube is modulated by a modulation signal so that the focusing current or voltage varies between a maximum value and a minimum value with its average value as the center. The focusing states of the electron beam at the maximum and minimum values of the modulated focusing current or voltage are detected by a video signal from the pickup tube. Based on this detection of focusing states of the electron beam, the average value of the modulated focusing current or voltage is corrected in such a way that the focusing states of the electron beam become equal to each other which correspond to the maximum and minimum values of the modulated focusing current or voltage. The correcting operation is carried out until the focusing states of the electron beam become equal at the maximum and minimum values, and the electron beam is then focused by the focusing current or voltage corresponding to the average value in the state.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile