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Film Supply Indicator Disclosure Number: IPCOM000049544D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09

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Yarrington, JC [+details]


The amount of film remaining on a supply spool 1 is computed electronically by comparing the ratio of steps taken by stepper motor 2 to the ratio of steps of a capstan 3 taken by a drive stepper motor 4. When the supply of film on spool 1 is nearly exhausted, an indicator 5 will be activated in response to this detection.