| 摘要 |
PURPOSE:To eliminate the need for any driving source for focus control mechanism and make operation easy by accumulating the driving force of a film feed driving mechanism as the spring extending force of the driving mechanism for the lens and morale mirror of the automatic focus control mechanism. CONSTITUTION:When a lock pawl 18 is disengaged from a rack rod 14 connected to a lens by a release operation, it is moved by the force of a spring 15 to move the lens for the purpose of focusing. At this time, gears 26 and 2c are disengaged by means of a cam 2d. The movement of the rack rod 14 causes a movable mirror 22 to be deflected by a pinion 19 and a cam 23. When the focus is matched, an electromagnetic member 17 is operated by the focusing signal and its pawl 18 engages the tooth of the rack rod to stop the rack rod 14, thereby maintaining the focusing. When the film is fed, the cam 2d is rotated together with a wheel train 2 by a motor 1 and the gears 26 and 2c are meshed by a spring 25 and cause the cam rod 14 to retreat while stretching the spring 15, and to be fixed by the pawl 16. The spring 15 becomes a driving source for the focusing device and the operation becomes easy as well. |
