Patent ID: 9304201
Filing Date: 2016-04-05
CPC Classification: G01S,G03G

Claim Text:
1. An image detection device comprising: a light-emitting unit that emits light toward an image holding member in which an image is held on a surface; a first light-receiving unit that is disposed at a position where specular reflected light of the light emitted toward the image holding member is received; a second light-receiving unit that is disposed at a position where diffuse reflected light of the light emitted toward the image holding member is received and detects light having an intensity that is equal to or higher than a predetermined intensity; a light-emission control unit that controls an intensity of the light emitted by the light-emitting unit, controls the intensity of the light emitted by the light-emitting unit to a first intensity that is predetermined in a case where the image held on the image holding member is detected, and controls the intensity of the light emitted by the light-emitting unit to a second intensity that is higher than the first intensity in a case where a reference of a density is detected; and a reference member that is disposed at a position through which light having an intensity that is less than the intensity detectable by the second light-receiving unit passes in a case of the first intensity and through which light having an intensity that is equal to or higher than the intensity detectable by the second light-receiving unit passes in a case of the second intensity, and includes a reference surface that reflects the light emitted by the light-emitting unit toward the second light-receiving unit in the case of the second intensity and has the density that is the predetermined reference, the reference member being rotatably supported centered on a rotation center.