Patent ID: 9513170
Filing Date: 2016-12-06
CPC Classification: G01J

Claim Text:
1. A spectral color sensor comprising: a spectroscopic unit configured to irradiate a measurement target with light from a light source and disperses reflected light from the measurement target; a light detection element that comprises a plurality of pixels and detects the dispersed light from the reflected light; a storage unit configured to store (i) a first correspondence relationship between the plurality of pixels and a wavelength of a dispersed light received by each of the plurality of pixels, (ii) a second correspondence relationship between the plurality of pixels and a stray light component received by each of the plurality of pixels, wherein the stray light component is, of light which is irradiated from the light source and is detected by the light detection element, light which is not the reflected light from the measurement target, and (iii) a third correspondence relationship between the plurality of pixels and a dark output which is output from the light detection element in a state that the light source does not emit a light; a first correction unit configured to, correct the first correspondence relationship between the plurality of pixels and a wavelength of a dispersed light received by each of the plurality of pixels, stored in the storage unit, depending on, of the plurality of pixels, a pixel which receives a specific wavelength of the dispersed light; and a second correction unit configured to, in accordance with a correction result by the first correction unit, correct the second correspondence relationship between the plurality of pixels and the stray light component received by each of the plurality of pixels stored in the storage unit, wherein the second correction unit does not correct the third correspondence relationship, but corrects the second correspondence relationship.