Optical apparatus

Details Optical apparatus Optical apparatus

1998-11-04

2000-02-08

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396 97, G03B 1336

Patent

active

060235896

ABSTRACT:
An optical apparatus for forming an object image on an image forming plane by using an optical system including a moving lens group for focus adjustment, includes a lens driving mechanism which drives the moving lens group, a control circuit which drives and controls the lens driving mechanism on the basis of control information provided for driving and controlling the moving lens group, and a temperature and/or humidity detecting sensor for detecting information on temperature and/or humidity, wherein the control circuit computes a correction amount by which a driving limit of the moving lens group toward a nearest-distance end or infinity-distance end for focus adjustment is variable, according to a temperature and/or humidity detection output of the temperature and/or humidity detecting sensor, and drives and controls the lens driving mechanism on the basis of the correction amount and the control information, so that the object image can be formed on the image forming plane of the optical system without shifting due to variations of temperature and/or variations of humidity.

REFERENCES:
patent: 5985129 (1999-04-01), Ohta

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