Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1993-08-09
1996-01-16
Sikes, William L.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354406, 354407, 354408, G01J 120, G01C 300
Patent
active
054850010
ABSTRACT:
A focus detecting apparatus has a photo-taking optical system for forming an object image on a prospective focal plane, and a focus detector for detecting the focus adjusted state of the photo-taking optical system in the plurality of areas of the prospective focal plane. The focus detector comprises a plurality of focus detecting units for detecting the focus adjusted states of the plurality of areas. At least two of the plurality of focus detecting units differ in the construction of the focus detecting optical system thereof from each other. Preferably, one of the focus detecting units is a unit of the pupil division re-imaging type including at least one pair of re-imaging optical elements for detecting the focus state of a focus detection area set on the center of the prospective focal plane and a pair of light receiving element arrays for receiving the images thereof, and another one of the focus detecting units is a focus detecting unit of the pupil division non-re-imaging type comprising a set of a plurality of lenslets for deteting the focus state of a focus detection area set on the marginal portion of the prospective focal plane and a pair of light receiving elements corresponding to the respective lenslets.
REFERENCES:
patent: 4562346 (1985-12-01), Hayashi et al.
patent: 4857718 (1989-08-01), Karasaki et al.
Abraham Fetsum
Nikon Corporation
Sikes William L.
LandOfFree
Focus detecting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detecting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-311116