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:
Dec. 10, 1996
Filed:
Jun. 07, 1995
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
By providing a plurality of landing correction coil pairs each comprised of a correction coil in the x-axis direction and a correction coil in the y-axis direction at four peripheral corner portions of the cathode ray tube (CRT) and by controlling the direction and magnitude of the resultant vector of the correction magnetic fields generated by the x-axis direction correction coil and the y-axis direction correction coil, the influence of the geomagnetism is canceled to allow a high-accuracy landing correction to be achieved. Furthermore, by detecting the chromaticity and luminance information on the screen to obtain a mislanding quantity and by forming a correction current corresponding to the quantity through the aforementioned correction means to perform an automatic correction to allow a quantitative landing correction to be performed correctly in a short time.