Patent ID: 11906919
Assignee: KONICA MINOLTA, INC.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC G

Claim 10:
11. A recording medium determination method in which a recording medium determination device is used, the recording medium determination device including a light emitter that emits inspection light to a recording medium, and a light detector that detects incident light including at least one of diffuse reflected light of the inspection light emitted to the recording medium or fluorescent light excited by the inspection light in the recording medium, the recording medium determination method comprising:
making a determination depending on a property of the recording medium based on a detection result of first incident light of the incident light in accordance with first inspection light of the inspection light and second incident light of the incident light in accordance with second inspection light of the inspection light obtained by the light detector,
wherein
the first inspection light has an intensity whose peak wavelength is more than or equal to 750 nm and less than or equal to 1100 nm,
the second inspection light has an intensity whose peak wavelength is shorter than the peak wavelength of the first inspection light, and
wherein
the determination depending on the property is based on a ratio between a first value in accordance with an amount of the first incident light received by the light detector and a second value in accordance with an amount of the second incident light received by the light detector.