Patent ID: 6142632
Filing Date: 2000-11-07
Classification: G03B

Abstract:
A film position detection apparatus for detecting a position of a film-shaped object transported comprising:means for generating electrostatic capacitance in response to the position of said film-shaped object transported, located near a place where said film-shaped object is transported;means for detecting the position of said film-shaped object based on a change in the electrostatic capacitance generated by said means for generating electrostatic capacitance; andmeans for suppressing an erroneous variation in the electrostatic capacitance generated by said means for generating electrostatic capacitance, located near said means for generating electrostatic capacitance, and being maintained at an electric potential different from that of said means for generating electrostatic capacitance, the ratio of the electric potentials of said means for suppressing an erroneous variation in the electrostatic capacitance and said means for generating electrostatic capacitance being selected so as to best suppress an erroneous variation in the electrostatic capacitance generated by said means for generating electrostatic capacitance.