OPTICAL SENSOR
First Claim
1. A photodetector having a photosensitive region in which pixels are arranged in a two-dimensional array, wherein each pixel is constructed of a plurality of photosensitive portions each of which outputs an electric current according to an intensity of incident light and which are arranged adjacent to each other within an identical plane, wherein across a plurality of pixels arrayed in a first direction in the two-dimensional array, photosensitive portions on one side out of the plurality of photosensitive portions forming each of said pixels are electrically connected to each other, wherein across a plurality of pixels arrayed in a second direction in the two-dimensional array, photosensitive portions on another side out of the plurality of photosensitive portions forming each of said pixels are electrically connected to each other, the photodetector comprising a signal processing circuit for reading electric currents from groups of photosensitive portions on the one side electrically connected among the plurality of pixels arrayed in the first direction and electric currents from groups of photosensitive portions on the another side electrically connected among the plurality of pixels arrayed in the second direction, and for detecting luminance profiles in the first direction and in the second direction in the two-dimensional array on the basis of the electric currents.
1 Assignment
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Accused Products
Abstract
A signal processing circuit 20 has switches 21, a shift register 22, and an integrating circuit 23, and outputs voltages Vout indicating luminance profiles in a second direction and in a first direction of light incident to a photosensitive region 10. The switches 21 are provided corresponding to groups of photosensitive portions on one side electrically connected among a plurality of pixels arrayed in the first direction and corresponding to groups of photosensitive portions on another side electrically connected among a plurality of pixels arrayed in the second direction. The shift register 22 is an element for sequentially reading electric currents from the groups of photosensitive portions on one side in the second direction and for sequentially reading electric currents from the groups of photosensitive portions on another side in the first direction. The integrating circuit 23 sequentially imports the electric currents from the groups of photosensitive portions on one side and the groups of photosensitive portions on another side sequentially read by the shift register 22, and converts the electric currents into voltages.
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Citations
6 Claims
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1. A photodetector having a photosensitive region in which pixels are arranged in a two-dimensional array,
wherein each pixel is constructed of a plurality of photosensitive portions each of which outputs an electric current according to an intensity of incident light and which are arranged adjacent to each other within an identical plane, wherein across a plurality of pixels arrayed in a first direction in the two-dimensional array, photosensitive portions on one side out of the plurality of photosensitive portions forming each of said pixels are electrically connected to each other, wherein across a plurality of pixels arrayed in a second direction in the two-dimensional array, photosensitive portions on another side out of the plurality of photosensitive portions forming each of said pixels are electrically connected to each other, the photodetector comprising a signal processing circuit for reading electric currents from groups of photosensitive portions on the one side electrically connected among the plurality of pixels arrayed in the first direction and electric currents from groups of photosensitive portions on the another side electrically connected among the plurality of pixels arrayed in the second direction, and for detecting luminance profiles in the first direction and in the second direction in the two-dimensional array on the basis of the electric currents.
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4. A photodetector having a photosensitive region,
wherein the photosensitive region comprises a plurality of first photosensitive portions electrically connected to each other in a first direction and a plurality of second photosensitive portions electrically connected in a second direction intersecting with the first direction, wherein the plurality of first photosensitive portions and the plurality of second photosensitive portions are arrayed in a two-dimensionally mixed state within an identical plane, and the photodetector comprising a signal processing circuit for reading electric currents from groups of first photosensitive portions electrically connected to each other in the first direction and electric currents from groups of second photosensitive portions electrically connected to each other in the second direction, and for detecting luminance profiles in the first direction and in the second direction in the two-dimensional array on the basis of the electric currents.
Specification