| 摘要 |
PURPOSE:To make a stepping motor used both as a driving source for a lens and for a shutter, and to shorten a time lag in a mechanism capable of performing lens driving by normal rotating operation and shutter driving by reverse rotating operation. CONSTITUTION:A switch 28a works on the first step of a shutter button, and a switch 28b works on the second step. A driving member 2 normally rotates as the switch 28a works, and a lens driving member 5 normally rotates in accordance with the member 2. After the member 2 reversely rotates, a member 3 stops at a focusing position by being locked by a locking lever 6. When the switch 28b works, a shutter blade performs opening and closing work by the series of reverse rotation of the driving member 2; however, the time lag occurs a little from a time when the blade is released to be opened to the time when a pin-hole is formed. When the switch 28b does not work and the switch 28a stops working, the driving member 2 finishes performing reverse rotation work in the time lag, so that the member 2 returns to an initial position without performing real opening. Consequently, sequence can be progressed to the time just before the shutter works, so that the time lag after the switch 28b works can be decreased by the work of the switch 28a. |
