Dynamic magnetic information storage or retrieval – Record transport with head moving during transducing – Tape record
Patent
1977-10-27
1978-09-26
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Record transport with head moving during transducing
Tape record
310268, G11B 2104, G11B 2118, G11B 545
Patent
active
041175190
ABSTRACT:
A guide drum apparatus includes: a stator plate having armature windings fixedly mounted on a surface thereof perpendicular to the axis of a center shaft. Rotary magnets are fixedly supported by the center shaft on a plane perpendicular to the axis of the center shaft and face the armature windings so that the magnetic fluxes from the armature windings cause the rotary magnets to rotate according to the operational principle of a brushless d.c. motor. A stationary hollow cylindrical drum coaxially and rotatably mounts the center shaft. A rotary hollow cylindrical drum coaxially and fixedly mounted on the center shaft and has a rotary head fixedly mounted at an outer peripheral surface thereof. The outer surfaces of the stationary and the rotary drums are arranged on the same cylindrical surface to form a magnetic tape guiding surface, and the hollows of the stationary and the rotary drums form a contiguous bore containing all of the rotary magnets, the armature windings and a rotary transformer therein. This guide drum apparatus can be made compact in size and yet can smoothly rotate the rotary head without disturbing the signals on the magnetic tape.
REFERENCES:
patent: 3435154 (1969-03-01), Kihara
patent: 3666894 (1972-05-01), Prochnow
patent: 4030133 (1977-06-01), Yamada et al.
patent: 4072874 (1978-02-01), Arnold
Koda Minoru
Shioyama Tadao
Eddleman Alfred H.
Matsushita Electric - Industrial Co., Ltd.
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