| 摘要 |
PURPOSE:To stabilize the posture at the time of lens change and to reduce the size, weight and cost of a device by the constitution in which a lens barrel freely turnable with respect to a piece of shaft and a lens barrel freely movable in an optical axis direction are supported on the shaft at respectively long fitting lengths. CONSTITUTION:The lens barrel 3 which supports the focus change lens 2 is pivotally supported freely turnably by the shaft 7 and the lens barrel 4 which supports the single focus lens 2 is movable in the optical axis direction by a projection 5a engaged in a recess 4b and the shaft 7. An operator turns the lens left by a handle 3 to move the same on the photographing optical axis of the lens 2. The lens barrel 3 is supported on the shaft 7 in through-holes 3c, 3e of the fitting length L1 of the arm and the lens barrel 4 is supported in the shaft 7 in through-holes 4f, 4d of the fitting length L2. Since the long fitting length is given in such a manner, the posture of the lens change is stabilized and the size, weight and cost of the device are reduced.
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