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