Patent ID: 7163822

Claim:
An apparatus for luminometric assay, comprising: a sample plate in which a plurality of reaction baths containing a biological sample are arranged one-dimensionally or two-dimensionally; an optical sensor array substrate comprising an optical sensor array in which a plurality of pixels each forming an optical sensor are arranged one-dimensionally or two-dimensionally, and a first pixel selecting circuit and a second pixel selecting circuit for selecting pixels that read out signals; a member fixing the sample plate and the optical sensor array substrate such that the reaction baths and the pixels are in a one-to-one correspondence in a vertical direction; and a single differential amplifier unit which differentially amplifies an output from a first pixel selected by the first pixel selecting circuit and an output from a second pixel selected by the second pixel selecting circuit, wherein the first pixel and the second pixel are used for detecting signals corresponding to a target sample and a control sample so as to generate the outputs, respectively, and lights generated by reactions between the target and control samples with a reagent in reaction baths corresponding to the first and second pixels are received by the optical sensors of the pixels, and the signals from the pixels are read out.