Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-08-21
1982-08-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
G01J 120
Patent
active
043429050
ABSTRACT:
An automatic focusing device of a microscope having an objective lens and a stage on which a specimen is placed comprises distance varying means for varying the relative distance between the objective lens and the stage, distance detecting means for producing a distance output corresponding to said distance, photoelectric detector means for photoelectrically detecting a high frequency component of the space frequency component of the image of the specimen on the stage by the objective lens, judging means for judging whether or not a predetermined peak smaller than a maximum peak exists in the output of the photoelectric detector means within a predetermined distance range from a first distance output of the distance detecting means when the output of the photoelectric detector means assumes said maximum peak and for producing an in-focus output when said predetermined peak exists, and means for determining said relative distance on the basis of said in-focus output.
REFERENCES:
patent: 3970841 (1976-07-01), Green
patent: 4254330 (1981-03-01), Stauffer et al.
patent: 4297571 (1981-10-01), Utagawa et al.
Fujii Norio
Kawahara Atsushi
Sawada Masahiro
Nelms David C.
Nippon Kogaku K.K.
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