Automatic film winding system
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United States of America Patent
Stats
-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Feb 4, 1981
filing date -
Feb 15, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic film winding system comprising in combination, a mechanical film winding or transport system including an electric motor and an optical film-advance sensing system comprising a light source and a light sensor for sensing the length of the film advanced in terms of one or more perforations of the film passed past a predetermined point. In response to the depression of a shutter button, a power supply is automatically connected to the light sensor and then to the electric motor and the light source when one exposure operation has been completed so that the film is advanced or wound. When a predetermined number of perforations has passed past the predetermined point and sensed by the optical sensing system; that is, after the film has been advanced by a predetermined length, the power supply is disconnected from the light sensor, the electric motor and the light source.
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