Magnetic-tape cassette with tape counting roller

Details Magnetic-tape cassette with tape counting roller Magnetic-tape cassette with tape counting roller

1978-12-04

1981-09-15

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 746, G11B 1518, G11B 1548

Patent

active

042900891

ABSTRACT:
A magnetic tape transport system with a magnetic tape cassette is provided with a tape transport measuring device which comprises a rotary pulse device which cooperates with a light source and a light-sensitive cell, the pulse device being rotated during transport of the magnetic tape and the number of pulses detected by the photo-cell being counted and displayed with the aid of a read-out device, such as a digital display device. In order to obtain a correct linear relationship between the length of tape which has been transported and the number of counted pulses, a tape guide roller in the cassette is used as pulse device, the cassette housing locally being provided with a light-transmitting portion, such as openings or transparent portions.

REFERENCES:
patent: 3037290 (1962-06-01), Dolby
patent: 3728685 (1973-04-01), Stalnert
patent: 3739276 (1973-06-01), Dornberger
patent: 3820101 (1974-06-01), Bolick
patent: 4001552 (1977-01-01), Muller
patent: 4167787 (1979-09-01), Satoh
patent: 4172231 (1979-10-01), d'Alayer de Costemore

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