| 摘要 |
A focus detecting device for detecting the focus position of an image forming system comprises plural arrays of small lenses, plural units of photoelectric elements respectively corresponding to the small lenses of the lens arrays and a synthesizing device. Each of the arrays includes plural small lenses arranged in a predetermined direction in the vicinity of a focal plane of the image forming system and the plural lens arrays are positioned mutually parallel. Each of the plural units of photoelectric elements is positioned behind the corresponding one of the small lenses. The synthesizing device synthesizes photoelectric output signals from the units of photoelectric element behind the positionally corresponding small lenses belonging to the plural lens arrays.
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