| 摘要 |
<p>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 H1 to exert a force F1 on a first electron beam I1 and a second velocity modulating coil (10) for generating a magnetic field H2 to exert a force F2 different from the force F1 on a second electron beam I2. 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 I1 and I2 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.</p> |
