Leader tape detecting circuit

Details Leader tape detecting circuit Leader tape detecting circuit

1981-02-06

1984-04-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250561, G01N 2186

Patent

active

044450311

ABSTRACT:
A leader tape detecting circuit which accurately detects the presence of a leader of a cassette tape independently of the type of tape or its condition. A light receiving element such as a phototransistor is disposed to detect the quantity of light passing through or reflected by the cassette tape. The output of the light receiving element is coupled directly to one input terminal of a comparator and through an integrator circuit to the other input terminal of the comparator. When the tape confronting the light receiving element changes from magnetizable tape to the leader, the quantity of light detected by the light receiving element changes and the output of the integrator circuit becomes different than that of the light receiving element. The detector produces an output signal representing this difference which is differentiated to produce the final output.

REFERENCES:
patent: 3660670 (1972-05-01), Howard
patent: 3673414 (1972-06-01), Taniguchi et al.
patent: 3812372 (1974-05-01), Wirtz et al.
patent: 3932746 (1976-01-01), Swanson
patent: 4166948 (1979-09-01), Steffan

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