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:
Jan. 30, 1996
Filed:
Apr. 20, 1994
Applicant:
Inventors:
Hidenori Takita, Nagasaki, JP;
Tatsuhiro Hirakawa, Nagasaki, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315370 ; 315-8 ;
Abstract
A color CRT display apparatus in which the polarity and the strength of the external magnetic field in the tube direction of a CRT are detected by a magnet detecting element, and a current corresponding to the strength of the external magnetic field is supplied to a compensating coil which is wound around a funnel portion between a display panel and a deflection yoke and at a place where a purity rotation and a raster rotation by said external magnetic field in said tube direction are simultaneously compensated, thereby both the purity rotation and the raster rotation can be automatically compensated in an optimum state.