Position adjusting apparatus of zoom lens barrel

Details Position adjusting apparatus of zoom lens barrel Position adjusting apparatus of zoom lens barrel

1993-04-16

1994-09-20

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359700, 354485, 354403, 3541951, 35419512, G02B 1514

Patent

active

053494750

ABSTRACT:
An adjusting apparatus of a zoom lens barrel is provided including a zoom mechanism in which the zooming is carried out by a rotation of a rotatable cam ring, a code plate provided on a linearly movable member which is linearly moved in an optical axis direction by the zoom mechanism, and a brush holder having brushes which come into contact with the code plate to detect a focal length thereof. The adjusting apparatus further includes a brush position adjusting mechanism which adjusts the position of the brush holder in the optical axis direction, and a device for confirming that the cam ring, whose reference angular position is varied in accordance with the adjustment of the brush holder by the brush position adjusting mechanism, is located at a predetermined angular position.

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