Head drum forming an air film between an outer surface thereof a

Details Head drum forming an air film between an outer surface thereof a Head drum forming an air film between an outer surface thereof a

1990-02-15

1991-08-20

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Head accessory

360 85, G11B 1560

Patent

active

050419374

ABSTRACT:
A head drum for a recording and/or reproducing apparatus is provided. The head drum includes a rotary drum, a stationary drum, and a plurality of magnetic heads for recording and/or reproducing signals on a magnetic tape. A chamber is provided which includes a first circumferentially extending recessed portion formed on the rotary drum and a second circumferentially extending recessed portion formed in the stationary drum. A plurality of grooves are formed in a surface of the rotary drum which communicates between the chamber and the exterior of the head drum. In a first embodiment, the second recessed portion is eccentrically arranged to extend closer to a first position on an exterior surface of the head drum where the magnetic tape starts to wrap about the head drum than at a second position on said exterior surface. In an alternative embodiment, the second circular recessed portion has a greater depth from the first circular recessed portion at the first position than at the second position. The recesses are provided to form a uniform air film between the magnetic tape and the head drum in cooperation with circumambient air introduced therebetween.

REFERENCES:
patent: 4040109 (1977-08-01), Kryltsov
patent: 4517615 (1985-05-01), Hino

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