Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2011-01-04
2011-01-04
Epps, Georgia Y (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S221000
Reexamination Certificate
active
07863550
ABSTRACT:
A focus detection device comprises: an image shift detection unit that detects a relative shift amount of a pair of images formed by a pair of light fluxes having passed through an optical system; and a conversion unit that converts the shift amount to a defocus amount based upon dimensional information of an exit pupil corresponding to an aperture restricting light flux in the optical system and distance information of the exit pupil indicating distance to the exit pupil from a predetermined imaging plane of the optical system.
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Bui-Pho Pascal M
Epps Georgia Y
Nikon Corporation
Oliff & Berridg,e PLC
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