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A focus detecting device in a camera having an optical member or an optical system for obtaining two images from an object and an optical member for displacing said two images in opposite directions or displacing one of said two images. Two minute photoelectric conversion element groups are used for

A focus detecting device in a camera having an optical member or an optical system for obtaining two images from an object and an optical member for displacing said two images in opposite directions or displacing one of said two images. Two minute photoelectric conversion element groups are used for converting variations in light quantity of portions of the object into electrical signals. A photographing lens projects the image of the object onto the minute photoelectric conversion element groups. A circuit calculates outputs [Figure] from the outputs of minute photoelectric conversion elements forming the minute photoelectric conversion element groups. A circuit which has a first calculation function for calculating Vout-3=Vout-1+Vout-2 and a second calculation function for calculating Vout-4=Vout-1-Vout-2 so that when Vout-3 becomes higher than a predetermined value, different outputs are produced under conditions that Vout-4>e1, e1≥Vout-4 ≥e2, and e2>Vout-4. A display produces different displays according to the different outputs where n is the number of the minute photoelectric conversion elements forming each of the two minute photoelectric conversion element groups, m is a number of a minute photoelectric conversion element, i is the output of a minute photoelectric conversion element in one of the two minute photoelectric conversion element groups, i′is the output of a minute photoelectric conversion element in the other minute photoelectric conversion element group, e1 and e2 are predetermined constants.

대표청구항 ▼

A camera focus detecting system comprising; optical means for obtaining two images from an object; an optical member for displacing at least one of said two images relative to each other; means including photoelectric conversion elements forming two groups for converting variations in light quantity

A camera focus detecting system comprising; optical means for obtaining two images from an object; an optical member for displacing at least one of said two images relative to each other; means including photoelectric conversion elements forming two groups for converting variations in light quantity of portions of said object into electrical output signals; a photographing lens for projecting the image of said object onto said photoelectric conversion element means; circuit means for calculating outputs [Figure] from the outputs of the photoelectric conversion elements forming said photoelectric conversion element means; calculation circuit means having a first calculation function for calculating Vout-3=Vout-1+Vout-2 and a second calculation function for calculating Vout-4=Vout-1-Vout-2, so that when Vout-3 becomes higher than a predetermined value, different outputs are produced under conditions that Vout-4>e1, e1≥Vout-4≥e2, and e2>Vout-4; and a display means for effectuating different displays according to said different outputs, wherein: n is the number of said photoelectric conversion elements forming each of said two photoelectric conversion element groups, m is a discrete number of a photoelectric conversion element, i is the output of a photoelectric conversion element in one of said two photoelectric conversion element groups, i′is the output of a photoelectric conversion element the second photoelectric conversion group and e1 and e2 are predetermined constants.