Tape recording apparatus using capacitive detectors as tape posi

Details Tape recording apparatus using capacitive detectors as tape posi Tape recording apparatus using capacitive detectors as tape posi

1979-01-30

1980-12-30

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 71, 360 93, G11B 1506, G11B 2330

Patent

active

042427088

ABSTRACT:
An improved beginning-of-tape/end-of-tape sensor for magnetic recording apparatus includes a metalic foil strip adhered to the reverse side of the magnetic record, the opposite side from the oxide, and positioned at the desired longitudinal positions on the tape. A pair of capacitive detectors are positioned adjacent the oxide surface of the tape to detect a change in capacitance when the metalic foil on the opposite side of the tape effectively bridges the two capacitive detectors. A digital logic comparator is provided for responding to the capacitance change to produce a signal representative of the beginning of tape or end of tape condition.

REFERENCES:
patent: 3566132 (1971-02-01), Walker
patent: 3695550 (1972-10-01), Lennox
patent: 3730453 (1973-05-01), Hotchkiss et al.
patent: 3834648 (1974-09-01), Rose, Jr. et al.
patent: 3834649 (1974-09-01), Papay
patent: 3851116 (1974-11-01), Cannon
patent: 3940790 (1976-02-01), Conroy et al.
patent: 3942190 (1976-03-01), Detwiler
patent: 4003093 (1977-01-01), Satoh
patent: 4044233 (1977-08-01), Sato
patent: 4093149 (1978-06-01), Shroff et al.

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