Apparatus and method for detecting foreign substance based on a difference in reading level of reflected light in a first wavelength range and a second wavelength range
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United States of America Patent
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Nov 22, 2022
Grant Date -
Dec 2, 2021
app pub date -
May 24, 2021
filing date -
May 27, 2020
priority date (Note) -
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Abstract
An image reading apparatus includes a light source to emit at least light in a first wavelength range and light in a second wavelength range, a background member having different light reflectances in the first and second wavelength ranges, an imaging device, and circuitry. The imaging device receives reflected light from the background member irradiated with the light in the first wavelength range, and generates first read information. The imaging device further receives reflected light from the background member irradiated with the light in the second wavelength range, and generates second read information. The circuitry detects presence or absence of a first foreign substance based on a difference in reading level of the first read information generated by the imaging device; and detect presence or absence of a second foreign substance based on a difference in reading level of the second read information generated by the imaging device.
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