Apparatus for automatic track registration

Details Apparatus for automatic track registration Apparatus for automatic track registration

1974-02-06

1977-03-22

Konick, Bernard

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 77, 360 70, G11B 1546

Patent

active

040140407

ABSTRACT:
An automatic track searching device for a magnetic video tape recorder/reproducer. Supply and take-up reels, a capstan, a pinch roller are associated with a guide drum. The drums helically encircled at a certain wrap angle by a magnetic tape. One or more video heads rotate in said guide drum and scan the tape in diagonal video tracks through a slot in said guide drum. The guide drum is equipped with a stationary track searching magnetic head within the aforementioned wrap angle. The magnetic gap of the stationary head is flush with the guide drum surface and has a length equal to the width and a direction perpendicular to the direction of the video tracks. The track searching head scans about the center of the magnetic tape in longitudinal direction to produce an amplitude-modulated high-frequency output voltage. The peaks of the output voltage are a measure of the actual position of the video tracks and are phase compared to rated position signals of the rotating video heads to form an error signal. The error signal is fed to the circuitry of a servomechanism cooperating with the capstan driving motor to minimize tracking error between the video heads and video tracks.

REFERENCES:
patent: 2916547 (1959-12-01), Ginsberg
patent: 3549797 (1970-12-01), Dann
patent: 3562427 (1971-02-01), Yano
patent: 3686432 (1972-08-01), Deguchi
patent: 3764755 (1973-10-01), Yamashita

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