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A focus detection system including a sensor unit including a plurality of photoelectric conversion elements and a focus detection unit for performing focus adjustment using a pair of signals output from the sensor unit. In the sensor unit, an aperture corresponding to each of the photoelectric conve

A focus detection system including a sensor unit including a plurality of photoelectric conversion elements and a focus detection unit for performing focus adjustment using a pair of signals output from the sensor unit. In the sensor unit, an aperture corresponding to each of the photoelectric conversion elements positioned in the outer area is smaller than an aperture corresponding to each of the photoelectric conversion elements positioned in the central area. In the focus detection unit, the pair of signals is formed by pencils of rays passing through different regions of an exit pupil of an imaging lens.

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What is claimed is: 1. A focus detection system comprising: a sensor unit including, in each of a plurality of focus adjusting regions, a plurality of photoelectric conversion elements each provided with an aperture for a light passing through a re-imaging lens to pass therethrough after passing th

What is claimed is: 1. A focus detection system comprising: a sensor unit including, in each of a plurality of focus adjusting regions, a plurality of photoelectric conversion elements each provided with an aperture for a light passing through a re-imaging lens to pass therethrough after passing through the re-imaging lens, an aperture corresponding to each of the photoelectric conversion elements positioned in an outer area of the sensor unit being smaller than an aperture corresponding to each of the photoelectric conversion elements positioned in a central area of the sensor unit; and a focus detection unit for performing focus adjustment using a pair of signals output from the sensor unit, the pair of signals being formed by respective pencils of rays passing through different regions of an exit pupil of an imaging lens. 2. The focus detection system according to claim 1, wherein the sensor unit includes a first sensor unit for receiving light passing through a first region of the exit pupil of the imaging lens and a second sensor unit for receiving light passing through a second region of the exit pupil of the imaging lens, the second region being different from the first region. 3. The focus detection system according to claim 1, wherein the sensor unit includes circuit units for outputting signals from the plurality of photoelectric conversion elements to an output line, each circuit unit being associated with a plurality of the plurality of photoelectric conversion elements. 4. The focus detection system according to claim 3, wherein the plurality of photoelectric conversion elements outputting a signal to the same circuit unit are arranged in a zigzag fashion. 5. The focus detection system according to claim 1, further comprising a mask disposed between the sensor unit and the imaging lens, wherein the mask has an aperture larger than a region where a pencil of rays corresponding to an outermost distance-measuring point in the position of the mask passes through. 6. A camera comprising a focus detection system according to claim 1. 7. A camera according to claim 6, which is a single-lens-reflex camera. 8. A focus detection system comprising: an imaging lens; a half mirror for dividing light rays from the imaging lens into transmitted rays and reflected rays; a sensor unit including, in each of a plurality of focus adjusting regions, a plurality of photoelectric conversion elements each provided with an aperture for a light passing through a re-imaging lens to pass therethrough after passing through the re-imaging lens, an aperture corresponding to each of the photoelectric conversion elements positioned in an outer area of the sensor unit being smaller than an aperture corresponding to each of the photoelectric conversion elements positioned in a central area of the sensor unit; and a focus detection unit for performing focus adjustment using a pair of signals output from the sensor unit, the pair of signals being formed by respective pencils of rays passing through different regions of an exit pupil of the imaging lens, wherein the reflected rays enter the sensor unit. 9. A camera comprising a focus detection system according to claim 8. 10. A camera according to claim 9, which is a single-lens-reflex camera. 11. A focus detecting device comprising: an imaging lens; a light sensor comprising in each of a plurality of focus adjusting regions a plurality of pixels, each pixel comprising a plurality of microlenses and, corresponding to each microlens of the plurality of microlenses, an aperture and a photoelectric conversion unit, wherein light passes through the microlens and aperture in that order to reach the photoelectric conversion unit; and a re-imaging lens for forming a plurality of second-order images on the light sensor using light from an object, wherein light passes through the microlens and aperture of the light sensor after passing through the re-imaging lens, wherein the apertures of a first plurality of pixels of the light sensor are smaller than the apertures of a second plurality of pixels of the light sensor. 12. A device according to claim 11, wherein for a pixel in an outer region of the light sensor, a microlens of the plurality of microlenses is decentered with respect to the corresponding aperture. 13. A device according to claim 11, wherein an entrance pupil of the re-imaging lens and an exit pupil of the imaging lens are conjugated by a mirror. 14. A device according to claim 11, wherein the first plurality of pixels are in an outer region of the light sensor and the second plurality of pixels are in a central region of the light sensor. 15. A device according to claim 11, wherein the plurality of microlenses for a pixel are not arranged in a straight line. 16. A device according to claim 15, wherein the plurality of microlenses for a pixel are arranged in a zigzag fashion. 17. A camera comprising a focus detecting device according to claim 11. 18. A camera according to claim 17, which is a single-lens-reflex camera. 19. A camera according to claim 17, wherein the re-imaging lens is made of a composite in which niobium oxide nanoparticles are uniformly dispersed in acrylic resin. 20. A camera according to claim 17, wherein an amount of defocus is determined in accordance with a phase difference between the positions of plural second-order images of the plurality of second-order images.