Patent ID: 7773486

Claim:
A two-dimensional photoreceptor array which receives a light spot array that includes plural light spots arranged in a two-dimensional array to detect the light intensity of each light spot, the two-dimensional photoreceptor array comprising: plural photoreceptor cells for detecting intensities of received lights from a light spot array; and a photoreceptor section in which said plural photoreceptor cells for detecting the intensities of received lights are arranged so as to form a photoreceptive area corresponding to the light spot array, wherein said plural photoreceptor cells for detecting the light intensity are arranged to detect the light intensity of each light spot of the light spot array and are determined from within the photoreceptive area, for each light spot, according to an irradiation position of the light spot array onto the photoreceptive area of said photoreceptor section, the light spot array includes light spots for performing information playback which include information to be reproduced, and light spots for position detection which are to be used for detecting the irradiation position of the light spot array, and said photoreceptor section comprises: an information playback photoreceptor section which receives the light spots for performing information playback in the light spot array, and outputs a playback signal including the information; and a position detection photoreceptor section which receives the light spots for position detection in the light spot array, and outputs a position detection signal including position information indicating the irradiation position of the light spot array, wherein the plural photoreceptor cells include photoreceptor cells for receiving the light spots for performing information playback that are determined from within said information playback photoreceptor section on the basis of the position detection signal, said information playback photoreceptor section, plural photoreceptor cells equal to or more than 3 rows×3 columns are assigned to a photoreceptive area corresponding to one light spot in the light sport array.