Mark detection apparatus for a micro-roll film

Details Mark detection apparatus for a micro-roll film Mark detection apparatus for a micro-roll film

1985-04-25

1986-08-26

Hix, L. T.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

250557, 250570, 353 26A, G03B 2752

Patent

active

046079505

ABSTRACT:
A mark detecting apparatus for a micro-roll film including one photoelectric element for detecting marks of different sizes provided on one edge portion of a micro-roll film for respective frames of the film, a pulse generating unit which generates pulses by radial slits formed in a disc adapted to be driven for rotation by contacting the micro-roll film, and a mark size judging circuit which counts the pulses produced from the pulse generating unit during the photoelectric element for the mark is detecting the mark of the film for judging the size of the mark by the counted value.

REFERENCES:
patent: 3744890 (1973-07-01), Suzuki et al.
patent: 4514641 (1985-04-01), Tanaka et al.

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