Method of and apparatus for determining the orientation of film

Details Method of and apparatus for determining the orientation of film Method of and apparatus for determining the orientation of film

1992-05-01

1993-09-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

355 41, G01N 2186

Patent

active

052488870

ABSTRACT:
A length of exposed film has a timing track which extends along one of the longitudinal margins thereof. The timing track includes a begin segment having a first width, an end segment having a different second width and a grating between the segments. The grating consists of alternating light and dark segments having a uniform width different from the widths of the begin and end segments. The two longitudinal margins of the film are scanned by respective sensors as the film advances towards a film processing apparatus. Whenever a segment passes by a sensor, the width of the segment and its position in the timing track are recorded. Since the widths of the begin and end segments differ from the width of the grating segments, the position of the begin or end segment relative to the grating can be established. This information, combined with a knowledge of which sensor detected the timing track, makes it possible to determine the orientation of the film.

REFERENCES:
patent: 4961086 (1990-10-01), Takanaka
patent: 4965628 (1990-10-01), Olliver et al.

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