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An automatic focus detecting device for a camera comprises a lens system having an image plane for focusing light transmitted along a light path, at least one self-scanning type photoelectric converting device including a plurality of charged storage type microphotoelectric elements disposed in a mi

An automatic focus detecting device for a camera comprises a lens system having an image plane for focusing light transmitted along a light path, at least one self-scanning type photoelectric converting device including a plurality of charged storage type microphotoelectric elements disposed in a microphotoelectric element row at a position corresponding to the image plane of the lens system, and a scanning circuit for the microphotoelectric element row for detecting the state of focus of the image of the object to generate a photoelectric output, and at least one light detector for monitoring the incident light and including a charge storage type photoelectric element provided near and in the same plane as the microphotoelectric element row for storing a quantity of charge in correspondence to the quantity of incident light, the self-scanning type photoelectric converting device having a charge storage time which is controlled according to the quantity of charge stored in the light detector in correspondence to the quantity of incident features. Further features of the invention include the provision of a contrast detecting circuit for providing peak values of photoelectric output differences between two of the microphotoelectric elements, and a focus judging circuit for providing a focus indication signal when the absolute value of the difference between the two contrast signals is lower than a predetermined focus detection threshold level. Still further features of the invention include the provision of a focus effective region judging circuit, a focus indication circuit, a light splitter, and a contrast compensation circuit.

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An automatic focus detecting device for a camera, said automatic focus detecting device having a light path along which light corresponding to an image of an object is transmitted and is incident, said device comprising: lens means having an image plane for focusing said light transmitted along said

An automatic focus detecting device for a camera, said automatic focus detecting device having a light path along which light corresponding to an image of an object is transmitted and is incident, said device comprising: lens means having an image plane for focusing said light transmitted along said light path; at least one self-scanning type photoelectric converting device including a plurality of charge storage type microphotoelectric elements disposed in a microphotoelectric element array at a position optically corresponding to the image plane of said lens means, and scanning means for said microphotoelectric element array for detecting the state of focus of the image of the object to generate a photoelectric output of said at least one self-scanning type photoelectric converting device; and at least one light detector for monitoring said incident light, which integrates the quantity of light incident upon said microphotoelectric element array and is provided adjacent thereto, so that a position optically corresponding to that of said photographic film surface is retained, and in the same plane as said microphotoelectric element array for storing a quantity of charge in correspondence to the quantity of incident light, said at least one self-scanning type photoelectric converting device having a charge storage time which is controlled according to the quantity of charge stored in said charge storage type photoelectric element of said at least one light detector in correspondence to the quantity of incident light.