Photocopying – Projection printing and copying cameras – With developing
Patent
1990-10-25
1991-11-12
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
With developing
355 41, 355 50, 355 77, G03B 2732, G03B 2752
Patent
active
050651781
ABSTRACT:
A photosensitive material detecting apparatus having a single or a plurality of optical sensor(s) disposed at a selected location on a transport path of a photosensitive material and (each) including a light emitter and a light receiver for optically detecting the photosensitive material. This apparatus includes a pulse generator provided for a drive motor associated with the transport path. The pulse generator generates a pulse signal synchronized with rotation of the drive motor. The light emitters emit pulsed light whose intervals between ON periods are controlled on the basis of the pulse signal, such that the pulsed light has short intervals when the photosensitive material is transported at high speed and long intervals when the photosensitive material is transported at low speed.
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Awazu Yasunobu
Masuda Yoshihiro
Nishimura Eiji
Dainippon Screen Mfg. Co,. Ltd.
Wintercorn Richard A.
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