Phase difference detecting type autofocusing device including an optical system having first and second lenses

Claim 1

A phase difference detecting type autofocusing device comprising: an optical system having first and second lenses, said first and second lenses having the same focal length and disposed on a first plane with the optical axes of said lenses being set in parallel; a plurality of first photosensors, having photosensitive regions and being disposed on a second plane in parallel with said first plane, for converting information of images focused by said first lens into electric signals; and a plurality of second photosensors, having photosensitive regions and being disposed on said second plane at positions covered by said second lens, for converting information of images focused by said second lens into electric signals, each of said second photosensors being spaced apart in the same direction by an equal distance from a corresponding one of said plurality of first photosensors, wherein said first and second photosensors are disposed two-dimensionally in a matrix shape and are formed on a single, rectangular semiconductor chip linearly along two opposite sides of said chip, and correlation calculation circuits and a multiplexer are formed on said chip at an area intermediate of said first and second photosensors, so that said photosensitive regions of said first photosensors are spaced apart by a substantial distance from said photosensitive regions of said second photosensors on said single, rectangular semiconductor chip.