Zoom lens

Details Zoom lens Zoom lens

1997-01-29

1998-08-04

Malley, Daniel P.

Photography

With exposure objective focusing means, focusing aid, or...

Mechanical rangefinder

396 71, 396 79, 396 91, G01J 120

Patent

active

057909024

ABSTRACT:
A device includes a zoom lens having a focusing lens the position of which varies according to a zooming operation, a first moving part arranged to mechanically move the focusing lens according to the zooming operation, and a second moving part arranged to move the focusing lens in such a way as to electrically correct any shift of focus that results from the movement of the focusing lens caused by the first moving part.

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patent: 5352882 (1994-10-01), Koyanagi et al.
patent: 5369461 (1994-11-01), Hirosawa et al.
patent: 5406345 (1995-04-01), Hirasawa

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