Auto-focus zoom lens assembly

Details Auto-focus zoom lens assembly Auto-focus zoom lens assembly

1985-03-27

1986-11-11

Corbin, John K.

G02B 711

Patent

active

046219064

ABSTRACT:
A zoom lens assembly with an auto-focus function includes first and second lens groups, and a control device for causing a drive mechanism to rotate a distance-presetting ring which moves one of the lens groups, to adjust a focus in accordance with a signal sent from a light-receiving element for indicating the focused state of a foreground object. A line pattern substrate is arranged to move with the distance-presetting ring. A change in the focal length caused by the rotation of a zoom ring is sensed by a substrate detecting element which informs the control device of that extent to which the distance-presetting ring is to be rotated in order to assure a proper focus notwithstanding the changed focal length. The corrective rotation of the distance-presetting ring is detected by movement of the line pattern substrate relative to the detecting element. The light-receiving element is supplied with a beam of light reflected from the foreground object through the first and second groups of lenses.

REFERENCES:
patent: 4008951 (1977-02-01), Himmelsbach
patent: 4183639 (1980-01-01), Suwa
patent: 4185191 (1980-01-01), Stauffer
patent: 4209241 (1980-06-01), Nanba et al.
patent: 4288152 (1981-09-01), Matsuda
patent: 4351590 (1982-09-01), Hirata et al.
patent: 4357085 (1982-11-01), Niwa et al.

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