Movable head automatic position acquisition circuit and method

Details Movable head automatic position acquisition circuit and method Movable head automatic position acquisition circuit and method

Filed on

1978-03-23

Date issued

1982-03-09

Examiner

Eddleman, Alfred H.

Patent Class

Dynamic magnetic information storage or retrieval

SubClass

Automatic control of a recorder mechanism

SubSubClass

Controlling the head

Other Related Categories

360 10, 360107, G11B 2110

Type

Patent

Status

active

Patent number

043192890

Description

ABSTRACT:
In an apparatus for automatically maintaining a transducing head assembly on the proper track, which is particularly adapted for a helical scan recording and/or reproducing apparatus capable of providing special motion effects, movable head automatic position acquisition circuit and method is disclosed. The apparatus is of the type which utilizes transverse positioning of the transducing head assembly to accurately follow a track during reproducing, and at the completion of the reproduction from the track, to properly position the head in position to either reproduce the next adjacent successive track, reproduce the same track or reproduce another track so that the appropriate special motion effect is achieved. In the still frame motion mode of operation, the head is normally reset to rescan one or more tracks repetitively by a head tracking servo. A missing head reset detector circuit detects the failure of the servo to timely reset the head at the end of the scan of the track or tracks and applies a plurality of properly spaced head reset signals to the movable head assembly to position the head so that the tracking servo can acquire control over head tracking.

REFERENCES:
patent: 3375331 (1968-03-01), Okazaki et al.
patent: 3585291 (1971-06-01), Yamakawa
patent: 3663764 (1972-05-01), Trost et al.
patent: 3699247 (1972-10-01), Mashima
patent: 3905043 (1975-09-01), Frank
patent: 4080636 (1978-03-01), Rauizza
patent: 4093885 (1978-06-01), Brown
patent: 4099211 (1978-07-01), Hathaway

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