SPECTRAL CHARACTERISTIC OBTAINING APPARATUS, IMAGE EVALUATION APPARATUS AND IMAGE FORMING APPARATUS

摘要

A spectral characteristic obtaining apparatus including a light irradiation unit configured to emit light onto a reading object; a spectroscopic unit configured to separate at least a part of diffused reflected light from the light emitted onto the reading object by the light irradiation unit into a spectrum; and a light receiving unit configured to receive the diffused reflected light separated into the spectrum by the spectroscopic unit and to obtain a spectral characteristic. The light receiving unit is configured to be a spectroscopic sensor array including plural spectroscopic sensors arranged in a direction, and the spectroscopic sensors include a predetermined number of pixels arranged in the direction to receive lights with different spectral characteristics from each other.

主权项

1. A spectral characteristic obtaining apparatus comprising:
a spectroscopic unit configured to separate reflected light from light emitted onto an object by a light irradiation unit, into a plurality of diffracted lights; a light receiving unit including a plurality of pixels configured to receive the plurality of diffracted lights with different spectral characteristics, the light receiving unit being configured to simultaneously receive only all of n-order diffraction light among the plurality of diffracted lights with the different spectral characteristics; a diffraction unit configured to lead lights with different wavelength characteristics to a number of pixels constituting the spectroscopic unit, the diffraction unit being positioned such that a diffraction direction has an angle with respect to an array direction of the plurality of pixels of the light receiving unit in a plane perpendicular to a light axis of the light receiving unit, the angle is set based on a product of a height and a width of each of the plurality of pixels, and a number of plurality of pixels included in each spectroscopic sensor of the light receiving unit.