Focusing method and apparatus for use in an optical system

Details Focusing method and apparatus for use in an optical system Focusing method and apparatus for use in an optical system

1980-03-03

1982-07-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, G01J 120

Patent

active

043408117

ABSTRACT:
A focusing method for use in an optical system and a focusing apparatus used therefor employ an illumination unit. The method comprises effecting photometry of light reflected from an object which is to be observed and which is illuminated only by light from the illumination unit, and causing a movement of the optical system to focus it, the magnitude of the movement being determined by the amount of light measured by the photometric operation.

REFERENCES:
patent: 3783270 (1974-01-01), Kamachi
patent: 4153834 (1979-05-01), Hayamizu
patent: 4163148 (1979-07-01), Fritsche et al.
patent: 4257705 (1981-03-01), Hosoe et al.

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