Title:
ELECTRON GUN, CATHODE-RAY TUBE AND PROJECTOR
Document Type and Number:
WIPO Patent Application WO/2002/073649
Kind Code:
A1
Abstract:
A cathode-ray tube having an electron gun for emitting a plurality of electron beams to scan different positions, in witch the velocities of these electron beams can be separately modulated. The cathode-ray tube is provided with a first velocity modulating coil (9) for generating a magnetic field H¿1? to exert a force F¿1? on a first electron beam I¿1? and a second velocity modulating coil (10) for generating a magnetic field H¿2? to exert a force F¿2? different from the force F¿1? on a second electron beam I¿2?. In the cathode-ray tube, the sharpness of the picture can be improved without deteriorating the quality of the picture by modulating the velocities of the electron beams I¿1? and I¿2? separately. A projector having such a cathode-ray tube, the luminance can be improved, and the sharpness of the picture can be improved without deteriorating the quality of the picture.
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Inventors:
TAKUMA HIROKAZU (JP)
Application Number:
PCT/JP2002/002041
Publication Date:
September 19, 2002
Filing Date:
March 05, 2002
Export Citation:
Assignee:
SONY CORP (JP)
TAKUMA HIROKAZU (JP)
TAKUMA HIROKAZU (JP)
International Classes:
H01J29/48; H01J29/52; H01J29/70; H01J29/76; H04N3/32; (IPC1-7): H01J29/52; H01J29/76; H01J31/10
Foreign References:
| JP2000123762A | 2000-04-28 | |||
| EP0233575A2 | 1987-08-26 | |||
| JPH05217517A | 1993-08-27 | |||
| JPH0177253U | 1989-05-24 |
Attorney, Agent or Firm:
Yamaguchi, Kunio (Hirayama Building 15-2, Uchikanda 1-chom, Chiyoda-ku Tokyo, JP)
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