Photocopying – Projection printing and copying cameras – Identifying – composing – or selecting
Patent
1992-05-27
1993-11-09
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Identifying, composing, or selecting
355 50, 355 28, 355 29, G03B 2752
Patent
active
052607402
ABSTRACT:
An image frame detecting apparatus of the present invention is provided with a light emitting portion provided in one of the respective sides of a guide path for a carrying photographic film, and including a light emitting diode (LED) array having a plurality of LEDs disposed in the transverse direction of the photographic film, a light receiving portion provided in the other of the respective sides of the guide path for the photographic film, and receiving light emitted from the light emitting portion, and a detecting portion for detecting an image frame recorded on the photographic film depending upon the quantity of light received by the light receiving portion. The LEDs has a reduced fluctuation and a reduced range of temperature change so that transmission density of the photographic film can be accurately detected. An image frame and a base portion of the photographic film can be surely discriminated. Further, the extended life of the LED allows to reduce a regular exchanging operation required when a cold-cathode tube or a halogen lamp or the like is used for a light source, and to improve a maintenance efficiency.
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Fuji Photo Film Co. , Ltd.
Wintercorn Richard A.
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