| 摘要 |
PURPOSE:To make the constitution of a mounting-dismounting part simple by providing two contacts for instructing the revolving direction and stoppage of a focusing motor, and one switch for infinite and shortest distance connected in parallel. CONSTITUTION:An electric power source device is provided within an interchangeable lens, and two switches for instructing the revolving direction and stoppage of a focusing motor are provided to an interchangeable lens mounting-dismounting part. Further, switches 24, 25 for reverse running the motor in infinite and shortest distance position are provided in parallel. One common contact thereof is provided in the mounting-dismounting part. Inputs are applied to gates 21, 22 via switches 24, 25, gates 37, 38, and a delay circuit 39. When the output Q of an FF 23 is L and the switch 24 or 25 is closed, the FF 23 is inverted through a gate 21, and the focusing motor is run reversely. Since the transmission and reception of the signals are made possible by the three contacts, the constitution of the mounting-dismounting part is made simple. |
