Camera having a finger detecting device

摘要

Detection electrodes formed from a thin metal plate are attached to rear faces of a lens barrier, a lens barrel and a decorative sheet. The detection electrodes are respectively connected to phase-difference detection circuits used for the lens barrier and the lens barrel. High-frequency pulse signals of a detection side and a reference side are inputted into the phase-difference detection circuits. When a finger touches the lens barrier or the lens barrel, a phase of the detection-side pulse signal is delayed relative to a phase of the reference-side pulse signal by influence of capacitance applied to the detection electrodes. The phase-difference detection circuit detects the overlap of a finger from the delay of the detection-side pulse signal.