SPECTRUM MEASUREMENT UNIT, SPECTRUM MEASUREMENT DEVICE, IMAGE FORMING APPARATUS, AND SPECTRUM MEASUREMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a spectrum measurement unit capable of stably measuring the wavelength spectrum of reflection light in the accurate position of a measurement object with high accuracy, without being affected by a vibration caused by a scan operation, feed speed irregularity, an imaging measurement period error, or the like.;SOLUTION: A spectrum measurement device 2 includes an illumination unit 4 and a spectrum measurement unit 6. The spectrum measurement unit 6 includes a beam splitter 8, a reduced-image forming lens 10 as an image formation optical system, spectrum measurement means 12, a reduced-image forming lens 14 as the image formation optical system, and image measurement means 16. The spectrum measurement means 12 is means for receiving the reflection light of light with which a paper sheet 18 as the measurement object is irradiated and obtaining color information. The image measurement means 16 is means having resolution higher than that of the spectrum measurement means 12, receiving the reflection light of the light with which the measurement object is irradiated, and obtaining the positional information of the relation between a spectrum measurement position by the spectrum measurement means 12 and the position of the original data of the measurement object corresponding to the spectrum measurement position.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT