Patent ID: 7193707

Claim:
A small sized wide wave-range spectroscope comprising: a collimator for changing light for measurement passed through an incident slit into collimated light; a plurality of diffraction gratings with different diffraction constants d supported rotatably around a rotational axis in parallel with the incident slit and disposed side by side in the direction of the rotational axis in an optical path of the collimated light; diffracted-light focusing members for focusing a plurality of diffracted light rays provided by the plurality of diffraction gratings by which the collimated light is diffracted, each of the diffracted-light focusing members being provided in association with each of the plurality of diffraction gratings, and a plurality of filters with different transmission wavelength ranges disposed at the focus positions of the plurality of diffracted light rays, respectively, and light amount detectors for detecting the amounts of light rays transmitted through the plurality of filters, respectively.