Patent ID: 7534987

Claim:
A light measuring apparatus comprising: a light source configured to emit light to a sample; and a light guide optics system configured to guide light generated as a result of applying the emitted light to the sample, to a photodetector, wherein the light guide optics system is provided in a lightproof unit to interrupt disturbance light, and includes optical elements for guiding the generated light to the photodetector; a positioning part for adjusting a position of at least one of the optical elements; and a position detecting part for detecting a position of at least one of the optical elements by an optical method, and the light measuring apparatus comprises a position adjusting part which adjusts the positions of the optical elements by controlling the positioning part and position detecting part; and a light emission control unit which controls operations of starting light emission of the position detecting part when adjusting a position of at least one of the optical elements, and stopping light emission of the position detecting part when measuring the sample.