Patent ID: 8384879

Claim:
An optical position sensor comprising: a single semiconductor body having a top and bottom surface, the body comprising: a first doped surface oriented region of a first conductivity type at the top surface of the body, a second doped surface oriented region of a second conductivity type at the bottom surface of the body substantially opposite to the first doped surface oriented region, the second conductive type different from the first conductivity type, wherein a sensitive area is defined where the first doped surface oriented region overlaps with the second doped surface oriented region; a resistive layer at least partially arranged in the sensitive area; two first electrode contacts; and two second electrode contacts, wherein the first electrode contacts are placed on the resistive layer so as to define a first detection area in the sensitive area between the first electrode contacts, and wherein the second electrode contacts are placed at least partially in the sensitive area on the bottom surface of the body, the surfaces of the second electrodes in the sensitive area defining a second detection area that overlaps with the first detection area.