| 摘要 |
<p>PURPOSE:To reduce the number of contact pieces to make a camera small-size and light-weight, by providing an area control-system electrochromic diaphragm in the exchange lens side and by transferring aperture information from the camera main body side to the exchange lens side by a pair of electric pieces. CONSTITUTION:An area variable type electrochromic diaphragm is provided in the exchange lens side, and circuits (A) and (B) are installed in the camera main body side and the exchange lens side respectively. SW1 is closed by the first stroke of the shutter button, and electric power is supplied to circuit (A) in the camera main body side and circuit (B) in the exchange lens side from power source batteries BT1 and BT2 respectively. Next, switch SW2 is closed by the second stroke of the shutter button, and an analogue signal corresponding to stop information opeated from output AO of analogue switch 52 is output to circuit (B) in the exchange lens side through contact pieces (a) and (a') during the period up to the shutter back screen running completion, and the electrochromic diaphragm is reduced in area. Thus, the number of contact pieces can be reduced to make the camera small-size and light- weight.</p> |
