Light pattern detection for film edge following

Details Light pattern detection for film edge following Light pattern detection for film edge following

1992-12-23

1994-09-20

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7703, 369125, 250548, 354106, 356400, G11B 5584, G11B 700, G03B 1724, G01N 2186

Patent

active

053494849

ABSTRACT:
A method of and apparatus for accurately positioning a magnetic read head in relation to a magnetic data track recorded in a magnetic recording medium of a photographic filmstrip. The read head is precisely aligned with one edge of the moving filmstrip through the use of an optical detector and an optical pattern placed below the filmstrip and extending beyond one edge of the filmstrip. The portion of the optical detector field of view corresponding to the optical pattern and the portion corresponding to the filmstrip are detected and the detected signal is processed to provide a control signal for moving the read head with respect to the film edge so as to position the head a precise distance away from the edge of the filmstrip without requiring physical contact with the filmstrip edge.

REFERENCES:
patent: 4176381 (1979-11-01), de Niet et al.
patent: 4558383 (1985-12-01), Johnson
patent: 4816939 (1989-03-01), Ford et al.
patent: 4843494 (1989-06-01), Cronin et al.
patent: 4987505 (1991-01-01), Iwabuchi et al.

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