INTERCHANGEABLE LENS

PURPOSE:To prevent an electronic circuit from breaking or malfunctioning by providing the signal earth wire and connection terminal of the electronic circuit and the earth wire and connection terminal of a motor to both a lens and a body side independently. CONSTITUTION:A power source and an electronic circuit 1 are incorporated on the body side and a driving motor for focusing and an electronic circuit 10 connected to the circuit are built in on the lens side. Then, a signal earth wire which connects the negative electrode of the motor 9 to the negative electrode of the power source 2 and a signal earth wire which connects the earth terminal of the circuit 10 to the negative electrode of the power source 2 are provided on the lens side independently. Further, a connection terminal for power grounding connected to the power earth wire and a connection terminal for signal grounding connected to the signal earth wire are provided in the inner peripheral area of the mount 5 of an interchangeable lens for camera fitting. Consequently, the earth potential of the circuit 10 never varies owing to a current flowing to the motor 9 to cause the circuit 10 from breaking or malfunctioning.