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:
Oct. 07, 1980
Filed:
Jun. 19, 1978
Seiji Fujisawa, Ikoma, JP;
Toshitaka Yukumoto, Ibaraki, JP;
Abstract
In a convergence device for a three primary-color projection type color television system with three cathode-ray tubes, it is known to use two separate cores respectively for dynamic and static convergence correction. In the present invention a single core is used and the core is provided with eight pole pieces aligned along the vertical, horizontal and two diagonal axes, each pole piece having a winding therearound. The vertically and horizontally aligned pole pieces are used to correct horizontal and vertical dynamic convergence respectively. The diagonally aligned pole pieces are used for both the horizontal and vertical static convergence correction by producing magnetic fields horizontally and vertically. The construction is much simpler than the prior art, and the correction of dynamic and static convergence which is required as a result of the difference in incident angles between electron beams projected on a screen can be easily attained.