Patent ID: 9723165
Date: 2017-08-01
CPC Classifications: H04N

Claim:
1. An image forming apparatus, comprising: a light emitter configured to radiate light to a recording medium; a light receiver including a plurality of detectors configured to receive a portion of the light radiated to the recording medium and to respectively output independent detection results; and an output determiner configured to determine a change in at least one of a conveying state of the recording medium and a relative arrangement between the light emitter and the light receiver, according to independent detection results respectively output by the plurality of detectors, wherein the light receiver includes at least one of a transmitted light receiver configured to detect an amount of light transmitted by the recording medium from the light radiated by the light emitter, a specularly reflected light receiver configured to detect an amount of light specularly reflected by the recording medium from the light radiated by the light emitter, and a diffusively reflected light receiver configured to detect an amount of light diffusively reflected by the recording medium from the light radiated by the light emitter.