Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1988-11-14
1990-05-29
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 722, G11B 552, G11B 2118
Patent
active
049300318
ABSTRACT:
An apparatus for recording and reproducing digital signals using a helical scan in which a drum of reduced diameter is employed without changing the tape format. Two heads are mounted on a drum at the same height in opposition to each other with a product of the diameter D of the drum and the wrap-around angle of the tape with respect to the rotary drum being constant while the speed of the drum is increased to a speed N times higher than a predetermined speed. One of the heads is mounted higher than the other by a distance of (1-1/N)P to provide a step, and the other head being is mounted at a position an angle behind the position at which the other head directly opposes the one of the heads, which angle is defined by: ##EQU1## where L is the track length in the tape format used when the rotary drum rotates at the predetermined rotational speed, .THETA. is the track angle, P is the track pitch, and C is a constant dependent on the drum diameter D and the wrap-around angle. Methods for performing high speed searches with this apparatus are also disclosed.
REFERENCES:
patent: 4163262 (1979-07-01), Kaemmerer
patent: 4318143 (1982-03-01), Kubota et al.
Miyake Ichiro
Nagahara Shinichi
Suzuki Tomoyuki
Takahashi Tokihiro
Yamada Tomoyasu
Pioneer Electronic Corporation
Tupper Robert S.
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