US 5,349,475 A · Position adjusting apparatus of zoom lens barrel

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.

Claims15

Dependent claims

An adjusting apparatus of a zoom lens barrel comprising;

a zoom mechanism in which the zooming is carried out by 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;
a brush holder having brushes which come into contact with the code plate to detect a focal length thereof;
a brush position adjusting mechanism which adjusts position of the brush holder in the optical axis direction;
and,
a confirmation means for confirming that the rotatable 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.

3 more elements

Dependencies are inferred from the claim text.

Position adjusting apparatus of zoom lens barrel

Life of this patent

Position adjusting apparatus of zoom lens barrel

Life of this patent

Abstract

Claims15