| 摘要 |
A lens system for controlling an exposure value through the lens system at variable focal lengths. The lens system includes a base; a front lens unit which is movably mounted on the base; a rear lens unit which is also movably mounted on the base; a lens mover for moving the front and the rear lens units; a guide shaft member for guiding the front and the rear lens units along the axial direction of the lens system; a operational shaft member which is disposed parallel to the axial direction of the lens system; a cam to rotate the operational shaft member; and a controller, to control the exposure vale, which is slidably connected to the operational shaft member along the shaft in accordance with the movement of the front and the rear lens units, and the controller is rotated in accordance with a rotation of the operational shaft member.
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