Measurement device and printing apparatus

A measurement device comprising:

• a light source that radiates an illumination light directly onto a medium sheet, an optical axis of the illumination light impinging upon a first point on the medium sheet when the medium sheet is positioned at a reference position;
• and
• first and second light receivers configured to receive first and second measurement lights, respectively, created from only an irradiated measurement region of the medium sheet, the first and second light receivers being spaced apart from each other in a first direction, a center of the irradiated measurement region corresponding to a measurement center in a plan view, the first and second measurement lights respectively corresponding to one of:
• first and second reflection lights that are obtained by reflecting the illumination light from the irradiated measurement region of the medium sheet;
• and
• first and second transmitted lights that are obtained by passing the illumination light through the irradiated measurement region of the medium sheet,
• wherein, when the medium sheet is positioned at the reference position, the measurement center is offset from the first point on the medium sheet, and the measurement center and the first point are on a first line extending in the first direction, and
• the light source is sandwiched between the first and second light receivers in the first direction when viewed from a normal direction of the medium sheet.

A printing apparatus comprising:

• an image forming member that forms an image on a medium sheet;
• first and second light sources configured to radiate first and second illumination directly onto the medium sheet, respectively, the first and second light sources being spaced apart from each other in a first direction;
• the first illumination light having a first optical axis at a first light incident angle with respect to the medium sheet;
• the second illumination light having a second optical axis at a second light incident angle with respect to the medium sheet;
• the first and second light incident angles being different from each other;
• and
• the first and second optical axes intersecting each other at a first point on the medium sheet when the medium sheet is located at a reference position;
• and
• a light receiver configured to receive first and second measurement lights created from only an irradiated measurement region of the medium sheet, a center of the irradiated measurement region corresponding to a measurement center in a plan view, the first and second measurement lights respectively corresponding to one of:
• first and second reflection lights that are obtained by reflecting the first and second illumination lights from the irradiated measurement region of the medium sheet;
• and
• first and second transmitted lights that are obtained by passing the first and second illumination lights through the irradiated measurement region of the medium sheet,
• wherein, when the medium sheet is positioned at the reference position, the measurement center is offset from the first point on the medium sheet, and the measurement center and the first point are on a first line extending in the first direction, and
• the light receiver is sandwiched between the first and second light sources in the first direction when viewed from a normal direction of the medium sheet.