Sheet recognition unit and sheet recognition method

Abstract

Provided is a sheet recognition unit including: a light source capable of emitting light having a specific wavelength to a sheet to be recognized, a light sensor that receives light coming from the sheet to be recognized, based on the light from the light source and outputs a light detection signal, and processing circuitry that recognizes the sheet to be recognized, using the light detection signal output from the light receiving unit. The light sensor includes a first light receiving element including a color filter that transmits blue light and infrared light, a second light receiving element including a color filter that transmits green light and infrared light, a third light receiving element including a color filter that transmits red light and infrared light, and a fourth light receiving element including a color filter that transmits only one of blue light, green light, red light, or infrared light.

Dependencies are inferred from the claim text.