Lens guide mechanism of a lens shutter type of camera

摘要

A lens guide mechanism has first and second members positioned adjacent to each other in which the second member supports a lens group. The second member is movable relative to the first member along an optical axis of the lens group. The lens guide mechanism also has a first guide shaft extending from the first member to the second member in a direction of the optical axis, one end of the first guide shaft being secured to the second member, a lens shutter provided on the first member, a first encoder provided on the first member for detecting a size of a diaphragm formed by the lens shutter which includes a first photosensor and a first rotating disk associated with the first photosensor, and a second encoder provided on the first member for detecting an axial position of the lens group which includes a second photosensor and a second rotating disk associated with the second photosensor. The first and second rotating disks are positioned adjacent to the guide shaft where the first guide shaft is positioned between the first and second rotating disks.