Patent ID: 7471603

Claim:
An optical analyzer for optically analyzing a sample located on a part of an analysis disc while rotating the analysis disc, the analysis disc having a track on which address information is recorded, the optical analyzer comprising: a reading diode emitting laser light for reading data concerning address information on the track of the analysis disc; an analyzing diode emitting to the sample laser light with a wavelength different from that of laser light emitted by the reading diode; a first photodetector for reading light emitted from the reading diode or the analyzing diode and reflected by or transmitted through the analysis disc; and a second photodetector for reading light emitted from the reading diode or the analyzing diode and reflected by the analysis disc, wherein position control of the reading diode and the analyzing diode in the direction of radius of the analysis disc is performed according to reading output from the second photodetector, and a result of analysis of the sample is read from reading output from the first photodetector.