Patent ID: 7705984

Claim:
A spectroscope comprising: a diffraction grating having a plurality of ruled parallel lines; and a plurality of spectroscopic paths, each of which has a collimator for collimating incident light, emits the collimated light to the diffraction grating, converges return light, which returns from the diffraction grating, by the collimator, and emits the converged light through a slit which is provided for wavelength selection and positioned at the focus of the collimator, wherein: measured light is emitted through the plurality of spectroscopic paths so as to extract light which is included in the measured light and has a predetermined wavelength; and the collimators of the spectroscopic paths are arranged so that on the diffraction grating, irradiation areas of light emitted from the collimators are offset from each other at least in a direction along the ruled parallel lines.