Automatic focusing apparatus for microscope

Details Automatic focusing apparatus for microscope Automatic focusing apparatus for microscope

1998-12-30

2000-10-03

Spyrou, Cassandra

Optical: systems and elements

Compound lens system

Microscope

359392, 2502013, G02B 2100

Patent

active

061281298

ABSTRACT:
An optical-path-difference automatic focusing apparatus for a microscope uses four automatic focusing control modes including an object search mode in which an object to be observed is searched for, a rough focus mode in which the object is brought to a roughly focused position with a lower accuracy of focusing, a front and back defocus sensing mode in which the degrees of front and back focusing of the object in at least a front and a back place with respect to the roughly focused position in the rough focus mode, and a fine focus mode in which the degree of focusing of the object with a higher accuracy of focusing is approximated linearly on the basis of the degrees of front and back focusing determined in the front and back defocus sensing mode and the object is brought to the focused position. Use of those modes realizes a highly reliable automatic focusing apparatus for a microscope capable of achieving a higher accuracy of focusing, regardless of the change of the optical condition.

REFERENCES:
patent: 4803352 (1989-02-01), Bierleutgeb
patent: 5672861 (1997-09-01), Fairley et al.
patent: 5790710 (1998-08-01), Price et al.

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