Helical scan VTR with deflectable head

Details Helical scan VTR with deflectable head Helical scan VTR with deflectable head

1979-08-22

1983-10-18

Konick, Bernard

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 70, 360109, G11B 2110

Patent

active

044109180

ABSTRACT:
A tracking control system used in video reproducing apparatus to keep the signal head on the parallel recorded tracks in spite of speed deviations of the recording medium has a bi-morph leaf to support the head. The bi-morph leaf includes piezo-electric material to which a control voltage can be applied to deform the piezo-electric material to the extent necessary to deflect the leaf in the proper direction and to the proper extent necessary to keep the head mounted on the leaf alignment with the correct track section. When the leaf reaches its maximum permissible deflection, the control voltage is reversed to shift the head in the opposite direction. In so doing the head either skips a track section, if the recording medium is moving too fast, or repeats playback of a section, if the medium is moving too slowly. If the apparatus is reproducing magnetically recorded signals by means of two heads mounted on separate bi-morph leaves to play back alternate track sections, the control voltages can be applied to the leaves to shift each of the heads in the direction of its gap length during an interval when it is not being used to play back a track.

REFERENCES:
patent: 3051797 (1962-08-01), Johnson
patent: 3235670 (1966-02-01), Kihara
patent: 3271622 (1966-09-01), Malagodl
patent: 3526726 (1970-09-01), Corbett
patent: 3588378 (1971-06-01), Protos
patent: 3697676 (1972-10-01), Protos
patent: 3706861 (1972-12-01), Giel
patent: 3764755 (1973-10-01), Yamashita
patent: 3787616 (1974-01-01), Falk
patent: 3821467 (1974-06-01), Iketaki
patent: 4080636 (1978-03-01), Ravizza
patent: 4099211 (1978-07-01), Hathaway
patent: 4151569 (1979-04-01), Hathaway
patent: 4203140 (1980-05-01), Watanabe

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