Focus detecting device

Details Focus detecting device Focus detecting device

1980-08-19

1982-08-31

Adams, Russell E.

G03B 708

Patent

active

043469701

ABSTRACT:
Disclosed is a TTL (Through-The-Lens) type focus detecting device for use in an interchangeable lens-equipped camera, in which a plurality of lenslets are positioned at or near the prescribed focal plane of the objective lens, each of the lenslets is associated with two or more pairs of photosensitive elements. Upon attachment of an objective lens to the camera body, one of the pairs of photosensitive elements for each lenslet is automatically selected to operate on the basis of the dimensions of the used objective lens. The outputs of the selected pairs of photosensitive elements for all the lenslets are processed to detect whether or not a positional difference between two images of an object formed with light beams from the objective lens at respective virtual exit pupils lying in almost symmetry with respect to the optical axis thereof is present, whereby the detection of whether or not the objective lens is in-focus is indicated.

REFERENCES:
patent: 3844658 (1974-10-01), Gela et al.
patent: 4147417 (1979-04-01), Mandler
patent: 4185191 (1980-01-01), Stauffer
patent: 4220406 (1980-09-01), Schaefer
patent: 4240727 (1980-12-01), Lermann et al.
patent: 4246476 (1981-01-01), Stauffer
patent: 4253752 (1981-03-01), Ichihara
patent: 4258989 (1981-03-01), Tokutomi et al.
patent: 4265520 (1981-05-01), Tokutomi et al.

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