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. 22, 1994
Filed:
Nov. 12, 1992
Yukinobu Iguchi, Kanagawa, JP;
Koji Hasegawa, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A cathode-ray tube has an electron gun disposed in its neck in confronting relationship to a phosphor screen through a deflection yoke mounted on the funnel. The electron gun has a cathode assembly for emitting three electron beams, and a main lens for passing the electron beams therethrough. The main lens includes a quadruple lens system responsive to focusing voltages for canceling an astigmatic effect produced on the electron beams when the electron beams are deflected by the deflection yoke, at a peripheral edge of the phosphor screen. The cathode-ray tube also has a first quadruple convergence yoke lens system disposed between the main lens and the deflection yoke for generating an astigmatic effect which is opposite to the deflection-induced astigmatic effect, and a second quadruple convergence yoke lens system disposed between the emitting means and the main lens means for generating an astigmatic effect which is in the same direction as the astigmatic effect generated by the first quadruple convergence yoke lens system.