Method of judging film frame position
Apparatus for writing a data onto photosensitive film
Method of and apparatus for positioning photographic originals in a copying station Patent #: 4947205
ApplicationNo. 889143 filed on 05/27/1992
US Classes:355/41, Including photocell355/28, And film severing355/29, With film severing355/50Original moves continuously
ExaminersPrimary: Wintercorn, Richard A.
Attorney, Agent or Firm
Foreign Patent References
International ClassG03B 027/52
Foreign Application Priority Data1991-05-28 JP
AbstractAn 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.