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:
Jul. 05, 2005
Filed:
Jun. 27, 2002
Takashi Itoh, Amagasaki, JP;
Masahide Yamauchi, Kyoto, JP;
Koji Fujii, Kashihara, JP;
Keisuke Koga, Souraku-gun, JP;
Toru Kawase, Katano, JP;
Takashi Itoh, Amagasaki, JP;
Masahide Yamauchi, Kyoto, JP;
Koji Fujii, Kashihara, JP;
Keisuke Koga, Souraku-gun, JP;
Toru Kawase, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A cathode ray tube according to the present invention include a cold cathode electron gun, the cold cathode electron gun including a cold cathode array for emitting electrons through field emission, a gate electrode for controlling the field emission, a first selective electrode provided around the cold cathode array and the gate electrode, and a second selective electrode opposing the first selective electrode, and the second selective electrode is adapted to have a lower potential than the gate electrode and the first selective electrode. In accordance with this configuration, the divergence of electron beams emitted from any positions in the cold cathode array can be converged uniformly upon removing electron beams emitted at a great emission angle. This allows the electron beams thereafter to be made narrower by an electrostatic lens. As a result, the present invention can provide a cathode ray tube capable of forming a high-resolution image.