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. 10, 2003
Filed:
Feb. 09, 2000
Nobuyuki Suzuki, Ohhara-machi, JP;
Yasuo Tanaka, Ichihara, JP;
Other;
Abstract
A projection type cathode ray tube has a panel and an electron gun. The electron gun has a plurality of electrodes including a cathode, a control electrode, an accelerating electrode, a first anode, a focus electrode and a second anode, which electrodes are arranged in a tube axial direction at predetermined intervals. The second anode has a first cylindrical portion at the panel side and a second cylindrical portion at the cathode side, the first cylindrical portion having a larger inner dinner diameter than the inner diameter of the second cylindrical portion. The focus electrode has a panel side cylindrical portion with an inner diameter D and a length L , an intermediate cylindrical portion with an inner diameter D and a length L , and a cathode side cylindrical portion with an inner diameter D and a length L . The inner diameters D , D , and D are different from each other. The focus electrode also has a first funnel like connecting portion between the panel side cylindrical portion and the intermediate cylindrical portion.