Lens barrel

Details Lens barrel Lens barrel

1998-06-02

1999-12-14

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359696, G02B 1514

Patent

active

060025328

ABSTRACT:
There is disclosed a lens barrel which comprises a supporting frame for supporting lens groups, a cam barrel to be rotated around the optical axis to move the supporting frame in the direction of the optical axis in a predetermined range, a manual focusing ring to which the operator supplies a manual power, a manual power transmission mechanism to be moved by the manual power supplied to the manual focusing ring to rotate the cam barrel, a first limitation member for inhibiting the power transmission from the manual focusing ring to the cam barrel by limiting the movement of the manual power transmission mechanism when the supporting frame is moved to a vicinity of one end of the predetermined range by the rotation of the cam barrel, a motor power transmission mechanism for transmitting the motive power supplied from the motor to the cam barrel so as to rotate the cam barrel, and a second limitation member for limiting the rotation of the cam barrel, wherein the second limitation member is provided at a position for limiting the rotation of the cam barrel at the same time as or after the first limitation member limits the movement of the manual power transmission mechanism while the supporting frame is moving toward one end of the predetermined range.

REFERENCES:
patent: 4796045 (1989-01-01), Hamanishi et al.
patent: 5229800 (1993-07-01), Kanno et al.

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