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:
Jun. 19, 1990
Filed:
Mar. 15, 1989
Taketoshi Shimoma, Isesaki, JP;
Shinpei Koshigoe, Fukaya, JP;
Takahiro Hasegawa, Gyoda, JP;
Masakazu Takaki, Fukaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an electron gun assembly, three electron beams emitted from cathodes are passed through an electrode arrangement in which two intermediate electrodes are arranged between focusing are accelerating electrodes. A focusing voltage which is varied depending on an deflection of the electron beam is applied to the focusing electrode and an accelerating voltage is applied to the accelerating electrode. A resistor is connected between the accelerating electrode and the earth through a variable resistor and intermediate points of the resistor are connected to the intermediate electrodes. Thus, convergent and divergent lenses are formed between the focusing electrode and the intermediate electrode and between the accelerating electrode and the intermediate electrode. The lens powers of the convergent and divergent lenses are varied in accordance with the adjustment of the variable resistor.