Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1988-03-28
1989-09-19
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7713, G11B 5592
Patent
active
048686921
ABSTRACT:
A tracking error signal forming circuit is disclosed, which circuit comprises means for obtaining a reproduction time difference between specified signals, each of which is contained in the reproduced signal reproduced by each of at least two heads having different azimuthal angles and mounted on an electro-mechanical converting element; reference value forming means for forming a reference value for the tracking control, operating means for calculating the difference between the reproduction time difference and the reference value or the sum thereof; displacement means for displacing forcedly the electro-mechanical converting element in the positive or negative direction; and maximum value detecting means for detecting the maximum value of at least one of the reproduced signals; the reference value forming means including means for calculating the difference between the reproduction time difference and the fixed reference value or the sum thereof at the point of time at which the maximum value of the reproduced signal is obtained by the maximum value detecting means.
REFERENCES:
patent: 3964094 (1976-06-01), Hart
patent: 4166282 (1979-08-01), Ragle et al.
patent: 4184181 (1980-01-01), Mijatori/
patent: 4482928 (1984-11-01), Moriya et al.
patent: 4542415 (1985-09-01), Kimura
patent: 4561028 (1985-12-01), Guisinger
Furumoto Mitsunobu
Kubo Kanji
Nakase Hiromi
Taniguchi Hiroshi
Faber Alan
Matsushita Electric - Industrial Co., Ltd.
Robertson David L.
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