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:
Sep. 11, 2001
Filed:
Jun. 01, 1999
Hitachi, Ltd., Tokyo, JP;
Abstract
A color cathode-ray tube has a fluorescent body film having picture elements of three colors. A shadow mask provided for the color cathode-ray tube is a color selection electrode and is installed close to the fluorescent face. An electron gun includes a cathode, a first electrode and a second electrode for discharging three electron beams in parallel and in a common plane. Further, the electron gun includes the main lens, which contains several electrodes that focus the three electron beams on the fluorescent face. The average diameter D of the vertical and the horizontal dimensions of the electron beam pass hole in the first electrode, the first electrode thickness T, and the space B between the electron beam pass hole in the first electrode and the electron beam pass hole in the second electrode are defined in an area that is surrounded by four straight lines that are expressed by the following relations, where A=D,/T: 100A=154B+17, 1000A=1420B+17, A=0.6, B=0.08.