Patent ID: 11945214
Assignee: SEIKO EPSON CORPORATION
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A processing device, comprising:
a first light source and a second light source configured to emit light having a peak wavelength from 900 nm to 2,100 nm;
a first light receiving portion configured to receive light emitted from the first light source;
a second light receiving portion configured to receive light emitted from the second light source;
a support portion configured to support a medium to be transported;
a processing portion configured to subject the medium to processing of increasing or reducing an amount of moisture contained in the medium, the processing portion facing the support portion; and
a first light shielding portion configured to block light emitted from the first light source, wherein
the first light source and the first light receiving portion are positioned upstream of the processing portion in a transport direction of the medium to be transported,
the first light source irradiates, with light, the medium before being subjected to processing by the processing portion,
the first light receiving portion receives light reflected by the medium,
the second light source and the second light receiving portion are positioned downstream of the processing portion in the transport direction,
the second light source irradiates, with light, the medium after being subjected to processing by the processing portion,
the second light receiving portion receives light reflected by the medium,
light emitted from the first light source advances through a first detection optical path, along which the light is incident on the first light receiving portion after being reflected by the medium supported by the support portion, or a first reference optical path, along which the light is incident on the first light receiving portion without being reflected by the medium supported by the support portion, and
the first light shielding portion is configured to be switched between:
a first state of shielding the first reference optical path without shielding the first detection optical path; and
a second state of shielding the first detection optical path without shielding the first reference optical path.