| 摘要 |
A cathode-ray tube comprises an evacuated envelope having therein a target and an electron-beam-producing means including a field-emission cathode therein. The beam-producing means comprises a plurality of spaced, pointed protuberances pointing in the same direction. Each protuberance has its own field-emission-producing means, a separate focusing-field-producing means for focusing the electrons emitted from the protuberance into a beam and means for modulating the individual beams in concert. The structure produces a plurality of modulated beams that are projected as a bundle in substantially parallel paths, which may be further operated upon as a single composite beam.
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