Optical apparatus

Details Optical apparatus Optical apparatus

1997-02-05

1998-12-01

Perkey, W. B.

Photography

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

Temperature compensating

G03B 1336

Patent

active

058451595

ABSTRACT:
An optical apparatus has an imaging optical system including an optical element system which undergoes changes in shape and refractive index by temperature or humidity. This optical apparatus is provided with at least one set of a light-emitting element and a light-receiving element so that a beam of light emitted from the light-emitting element is received by said light-receiving element, and has a function of presuming a shift of an imaging position caused by the changes in shape and refractive index of the imaging optical system from an output of the light-receiving element.

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patent: 5278699 (1994-01-01), Ito et al.
patent: 5424871 (1995-06-01), Ito et al.

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