Helical scan video tape recorder head start-up

Details Helical scan video tape recorder head start-up Helical scan video tape recorder head start-up

1981-10-28

1983-11-22

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 75, G11B 2104

Patent

active

044172877

ABSTRACT:
A helical scan type video tape recorder, in which the wrap-around angle of the magnetic tape around the revolving drum is relatively large, provides fluctuations to the drum motor start-up torque and the reel motor torque for performing start-up of the revolving head drum with magnetic tape wrapped therearound when the recorder is operated in the stand-by mode. Fluctuations in the drum motor start-up torque and those in the reel motor torque are mutually synchronized in opposite directions, whereby when one is stepped up for increase in the revolving head drum start-up torque, tension in the magnetic tape wrapped around the drum is weakened, and conversely when the revolving head drum torque is decreased, tension in the magnetic tape is strengthened, thereby assuring start-up operations of the revolving head drum even when adherence has occurred between the magnetic tape and the revolving head drum.

REFERENCES:
patent: 3916441 (1975-10-01), Jones
patent: 4011588 (1977-03-01), Yasuda et al.

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