Control apparatus for positional control of an optical system

Details Control apparatus for positional control of an optical system Control apparatus for positional control of an optical system

1996-04-26

1998-12-08

Epps, Georgia Y.

Optical: systems and elements

Image stabilization

396 52, 396 55, G02B 2764, G03B 1700

Patent

active

058478744

ABSTRACT:
A control apparatus for controlling quickly and correctly, positions of a group of zoom lenses and a group of focus lenses without being subjected to an attitude of a camera. The control apparatus has a group of zoom lenses, a group of focus lenses, actuators for mechanically driving the group of zoom lenses and the group of focus lenses, drive circuits for driving the actuators, and a position detecting devices for detecting each of the present positions of the group of zoom lenses and focus lenses. The apparatus also includes a target position calculating device for calculating a target position for each group of lenses, a positioning device for respectively positioning the groups of the lenses at their target positions, an evaluation device for evaluating the results of the positioning of the focus group and the zoom group of lenses, and a correction device for outputting corrected values for canceling errors caused by the effect of gravity by referring to the output of the positioning device and that of the evaluation device.

REFERENCES:
patent: 4841325 (1989-06-01), Hoshino et al.
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patent: 5335032 (1994-08-01), Onuki et al.
patent: 5365296 (1994-11-01), Murakami et al.
patent: 5438190 (1995-08-01), Kaneda et al.
patent: 5471296 (1995-11-01), Parker et al.

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