US 2021/0239609 A1 · WATER CONTENT SENSOR

Abstract

A water content sensor for a recording medium includes a single light emitting part, a wavelength separation device and a detector device. The single light emitting part emits infrared light in a wavelength range including an absorption wavelength of water along one incident light path toward the recording medium. The wavelength separation device separates infrared light, either reflected from or transmitted through the recording medium, into a first light in a first wavelength range including the absorption wavelength of water and a second light in a second wavelength range excluding the first wavelength range. The detector device receives the first light in the first wavelength range and the second light in the second wavelength range, and generates a first output corresponding to an intensity of the first light received and a second output corresponding to an intensity of the second light received, respectively.

Claims15

Dependent claims

A water content sensor to determine a water content ratio of a recording medium, comprising:

a single light emitting part to emit infrared light in a wavelength range including an absorption wavelength of water along one incident light path toward the recording medium;
a wavelength separation device to separate one of infrared light reflected from the recording medium along a reflection light path and infrared light transmitted through the recording medium along a transmission light path, into a first light in a first wavelength range including the absorption wavelength of water and a second light in a second wavelength range excluding the first wavelength range;
and
a detector device to receive the first light in the first wavelength range and the second light in the second wavelength range, and to generate a first output corresponding to an intensity of the first light received and a second output corresponding to an intensity of the second light received, respectively.

1 more element

A water content sensor to determine a water content ratio of a recording medium, comprising:

a single light emitting part to emit infrared light in a wavelength range including an absorption wavelength of water along one incident light path to the recording medium;
a filter switching device comprising:
a filter portion having, as a passband, a predetermined wavelength range including the absorption wavelength of water in received infrared light corresponding to one of infrared light reflected from the recording medium along one reflection light path and infrared light transmitted through the recording medium along one transmission light path;
and a light transmissive portion to transmit light in an entire wavelength range, including the predetermined wavelength range, of the received infrared light;
and
a detector to receive light transmitted through the filter portion and the light transmissive portion of the filter switching device to generate an output corresponding to an intensity of the received light,
the filter switching device to alternately position the filter portion and the light transmissive portion at a predetermined position to receive the received infrared light, and
the filter switching device being disposed relative to the detector so that:
when the filter portion is disposed in the predetermined position, light transmitted through the filter portion, of the received infrared light received by the filter portion, is sent to the detector;
and when the light transmissive portion is disposed in the predetermined position, light transmitted through the light transmissive portion, of the received infrared light received by the light transmissive portion, is sent to the detector.

7 more elements

An image forming device having a sensor to determine a water content ratio of a recording medium, comprising:

a single light emitting part to emit infrared light in a wavelength range including an absorption wavelength of water along one incident light path toward the recording medium;
a wavelength separation device to separate one of infrared light reflected from the recording medium along one reflection light path and infrared light transmitted through the recording medium along one transmission light path, into a first light in a first wavelength range including the absorption wavelength of water and a second light in a second wavelength range excluding the first wavelength range;
and
a detector device to receive the first light in the first wavelength range and the second light in the second wavelength range, and to generate a first output corresponding to an intensity of the first light received and a second output corresponding to an intensity of the second light received, respectively.

1 more element

Dependencies are inferred from the claim text.

Water content sensor

Life of this patent

Water content sensor

Life of this patent

Abstract

Claims15