Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1987-04-07
1989-08-29
Faber, Alan
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 7702, 360 66, 358342, 358906, 358909, 369 44, H04N 5781, G11B 2110
Patent
active
048622940
ABSTRACT:
In an electronic still camera system, a plurality of circular tracks are performed on a magnetic disc and the magnetic head 1 is used for both reproduction and erasing of the disc. When any one of the tracks is selectively erased, the reproducing operation is set by a control circuit 16 and tracking control of the magnetic head 1 is performed by a tracking servo circuit 5 of a Dither system. The DC component of a tracking control signal in an on-track state, that is, a signal DC' showing the average trace position of the magnetic head 1 on the disc is held in a sample and hold circuit 8. In addition, an oscillator 10 generates an AC signal AC' with an amplitude which moves the magnetic head 1 by the predetermined maximum amount d of track deviation. After a lapse of a predetermined period, tracking control of the magnetic head 1 is performed by a combined signal of the DC signal DC' and the AC signal AC' and reproduction operation is switched into erasing operation, so that the target track is erased.
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"An Electronic Still Camera System", IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, Aug., 1986, pp. 345-354.
Mihara Yoshikazu
Nakashima Hiroshi
Faber Alan
Sanyo Electric Co,. Ltd.
Young W. R.
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