Optical system for use in focus detecting apparatus

Details Optical system for use in focus detecting apparatus Optical system for use in focus detecting apparatus

1987-11-18

1989-02-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G01J 120

Patent

active

048088064

ABSTRACT:
In an optical system for use in a focus detection apparatus that includes a pair of diaphragm stops and a pair of optical splitting elements disposed just behind said diaphragm stops. Both pairs are symmetrical with respect to the principal axis of light. The optical system detects the focus position by detecting the relative positional mismatch between the refocused images of an object. The optical axis of each of said optical splitting elements is positioned away from the center of aperture of each of the diaphragm stops with respect to the principal axis of light so as to compensate for any transverse chromatic aberration that may develop in the focus detecting apparatus.

REFERENCES:
patent: 4600830 (1986-07-01), Tokutomi et al.
patent: 4602153 (1986-07-01), Suzuki
patent: 4698492 (1987-10-01), Ohtaka et al.

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