| 摘要 |
PURPOSE:To prevent an electronic circuit from breaking or malfunction 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 side and a body side. CONSTITUTION:A driving motor 9 for focusing and an electronic circuit 10 are incorporated on the lens side and an electric circuit 1 and a power source 2 which are connected to the circuit 10 are built in one the body side. Then, a power 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 independently on the body side. 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 independently in the inner peripheral area of a mount 5 for lens fitting on the body side. Consequently, the earth potential of the circuit 10 never varies owing to a current flowing to the motor 9 to cause the circuit 10 to breaking or malfunction. |
