Hitachi of Tokyo has received US Patent No. 8,175,809, "Fluorescence analyzing method, fluorescence analyzing apparatus and image detecting method." A surface is provided consisting of different regions containing oligonucleotides spaced apart equidistantly in the vertical and horizontal directions. The patent describes a method of irradiating the surface with light for fluorescence measurement. The light-produced fluorescence is focused to form an image and detected with a two-dimensional sensor.