Method of and apparatus for determining frame position
AssigneeFuji Photo Film Co., Ltd.
InventorsIzumi Watanabe, Keiichi Yamana
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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.
Claims10
A frame position determining method comprising the steps of:
- moving a film in its longitudinal direction, said film having blip marks provided thereon for respective frames in advance;
- and
- detecting blip marks to determine the position of a particular frame on said film in such a manner that 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.
A frame position determining apparatus comprising:
- film feed means rotating two reels having a film wound thereon, said film having blip marks provided thereon at a predetermined regular spacing;
- a photosensor defined by a combination of light-emitting and -receiving elements disposed so as to face each other across said film;
- and
- means for determining the position of a particular frame by detecting blip marks through said photosensor in such a manner that 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.
Dependencies are inferred from the claim text.