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:
Oct. 27, 1998
Filed:
Jul. 19, 1996
Hiroshi Jitsukata, Yokohama, JP;
Soichi Sakurai, Yokohama, JP;
Hiroshi Yoshioka, Mobara, JP;
Yoshio Sato, Chousei-gun, JP;
Hiroshi Sasaki, Mobara, JP;
Hidetsuyo Baba, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A color cathode ray tube includes a three beam inline electron gun; a deflection device for performing deflection and self-convergence; a static beam convergence device having permanent magnets for generating a magnetic field adjustable to converge three electron beams at a central portion of a phosphor screen; and a dynamic convergence device having coreless electromagnetic coils for generating a magnetic field adjustable to converge three electron beams at peripheral portions of the phosphor screen. The dynamic beam convergence device includes a spiral coil conductor formed on a non-magnetic film. The dynamic beam convergence device also includes two cylindrical holder members having large and small diameters, respectively, made of an insulating material, which are held in such a manner as to be coaxial and overlapped on each other; and a coil member including a plurality of printed coils for generating magnetic fields having an even number of poles contained in a flexible film, the coil member being disposed between the two cylindrical holder members having large and small diameters respectively; wherein a plurality of the printed coils are stacked in the flexible film in such a manner as to be insulated from each other; and printed coils adjacent to each other and having the same diameter are electrically connected to each other in the flexible film.