Patent ID: 8798489
Filing Date: 2014-08-05
Classification: B41J,G03G,H04N

Abstract:
1. A recording-medium detecting device comprising: a reference plate configured to reflect light; an emission unit configured to emit light onto a recording medium and the reference plate; and a receiving unit configured to receive reflected light from the recording medium at a first receiving portion and to receive reflected light from the reference plate at a second receiving portion, wherein the reference plate is used to adjust a light quantity of the emitted light from the emission unit according to a light quantity of reflected light from the reference plate, wherein the reference plate is provided closer to the receiving unit than the recording medium onto which the emission unit emits the light, and wherein a part of the reference plate is provided between both ends of the recording medium onto which the emission unit emits the light in a direction perpendicular to a conveying direction of the recording medium, wherein the first receiving portion and the second receiving portion are capable of simultaneously receiving the reflected light from the recording medium and the reflected light from the reference plate.