| 摘要 |
A focus detection device comprises a micro lens array disposed near an estimated focal plane of an image forming optical system and formed by arraying a plurality of micro lenses, a light receiving device provided in correspondence to each of the plurality of micro lenses, which includes three or more light receiving portions disposed along a direction in which the plurality of micro lenses are arrayed, and a focus detection circuit that detects a focal adjustment state with the image forming optical system based upon a signal output from the light receiving device.
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