Method of and apparatus for determining frame position

Details Method of and apparatus for determining frame position Method of and apparatus for determining frame position

1986-12-03

1988-04-05

Hix, L. T.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 45, 355 77, 250557, 250561, G03B 2752

Patent

active

047362243

ABSTRACT:
A method of determining the position of a particular frame on a film being moved in its longitudinal direction, the film having blip marks provided thereon for respective frames in advance. In this method, no detection of blip marks is effected during a period of time which begins immediately after the leading end edge of a blip mark has been detected and which ends slightly before the time at which the leading end edge of a subsequent blip mark is expected to be detected. Accordingly, there is no fear of dust attached to the film being misjudged to be a blip mark. Also disclosed is an apparatus which may suitably be employed to carry out the above-described method.

REFERENCES:
patent: 4457008 (1984-06-01), Nakatani et al.

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