Focus detection device

Details Focus detection device Focus detection device

1984-05-16

1985-12-31

Perkey, William B.

G03B 300

Patent

active

045617481

ABSTRACT:
An active focus detecting device for use in a camera is provided and includes emitting light that is polarized, and collimated so that the light forms a light bundle which will pass near the optical axis of the objective lens, and then will be projected in a diverging light path after having been focused by the objective lens towards the object. A polarization component is provided for receiving the returning light and directing a component of that light towards a detector for determining a focusing condition.

REFERENCES:
patent: 3936187 (1976-02-01), Momose
patent: 4032934 (1977-06-01), Hendrickson
patent: 4317991 (1982-03-01), Stauffer
patent: 4357085 (1982-11-01), Niwa et al.
patent: 4464038 (1984-08-01), Nanba

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