Patent ID: 7423246

Claim:
An analysis apparatus for emitting detection light to an analysis optical disc and reading a state of an analysis object disposed in a part of the analysis optical disc, wherein the analysis apparatus comprises a control unit as a power control system of a laser device for generating laser light emitted to the analysis optical disc, wherein the control unit has a first switching state in which an output of the laser light is detected by a monitor light-receiving element and feedback is performed in such a way that the monitor light-receiving element has a constant value, and a second switching state in which feedback is performed in such a way that a detection signal of laser light has a constant average value, the laser light having been emitted to the analysis optical disc and reflected thereon or passed therethrough, and the control unit switches the power control system to the first switching state until a reading position of the analysis object in the analysis optical disc is detected, and switches the power control system to the second switching state at the reading position of the analysis object in the analysis optical disc.