Method for detecting a focus condition of an imaging optical sys

Details Method for detecting a focus condition of an imaging optical sys Method for detecting a focus condition of an imaging optical sys

1983-05-20

1986-02-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G01J 120

Patent

active

045724768

ABSTRACT:
A method for detecting a focus condition of an objective lens system of a single-lens reflex camera is disclosed. A light flux emanating from the objective lens system is divided into first and second light fluxes by means of a prism array having inclined surfaces whose normal lines make a criticl angle with respect to the optical axis of the imaging optical system. Said first and second light fluxes are transmitted through first and second halves of the objective lens system. The first and second light fluxes are made incident upon first and second light receiving element arrays, respectively, to produce first and second sets of output signals representing light distribution of first and second images formed by the first and second light fluxes. From the first and second sets of output signals, interpolated values are derived to form first and second modified sets of signals composed of the first and second sets of output signals and interpolated values. A correlation between the first and second modified sets of signals is derived to detect the focus condition of the objective lens.

REFERENCES:
patent: 4037958 (1977-07-01), Schmidt et al.
patent: 4203031 (1980-05-01), Kamachi et al.
patent: 4297571 (1981-10-01), Utagawa et al.
patent: 4373791 (1983-02-01), Araki

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