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:
Mar. 01, 1988
Filed:
Feb. 13, 1987
Shinpei Koshigoe, Fukaya, JP;
Takeshi Fujiwara, Kumagaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A color cathode ray tube apparatus having an electron gun assembly including a device for modulating a scanning velocity of electron beams at an auxiliary lens section for clarifying an image projected to a screen is disclosed. The color cathode ray tube apparatus comprises an enclosure having a panel section, a funnel section and a neck section, an electron gun assembly, including rear electrodes disposed in front of three cathodes for emitting electron beams, each having three through-holes for passing the beams for forming an auxiliary lens for preliminarily focusing the beams, and a front electrode located in front of the rear electrodes for forming a main lens in cooperation with one electrode thereof for further focusing the beams and converging the beams. The rear electrodes have a pair of electrode members having three beam through-holes defined by cylindrical projections, oblique surfaces opposed at a predetermined interval, formed of the cylindrical projections, each surface crossing perpendicularly to a horizontal plane for scanning the beams and having a predetermined angle with respect to a plane perpendicular to the axis of an electron beam path. The scanning velocity modulating device is connected with the pair of electrode members for supplying a modulating voltage thereto, when luminance values of a video signal arrive at a predetermined level.