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US 4,786,922 AGranted
Electron beam recording and reproducing apparatus
AssigneeHitachi, Ltd.
InventorsShigeyuki Hosoki, Keiji Takata, Toshiyuki Aida, Sumio Hosaka
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Abstract
An electron beam recording and reproducing apparatus which radiates the electron beam emitted from a needle cathode to a disc for recording and reproduction is disclosed. The needle cathode moves on the disc. A magnetic field is applied in the axial direction of the needle cathode in order to converge and radiate the electron beam emitted from the needle cathode to the disc.
Claims8
An electron beam recording and reproducing apparatus comprising:
- a needle cathode;
- a disc disposed in such a manner as to face said needle cathode with a fine gap therebetween;
- means for moving said needle cathode with respect to a surface of said disc;
- means for rotating said disc;
- and
- means for applying a magnetic field in the axial direction of said needle cathode in order to converge an electron beam emitted from said needle cathode onto said disc;
- wherein the electron emitted from said needle cathode to said disc is used as means for recording and reproduction.
4 more elements
Dependencies are inferred from the claim text.