Detection device, detection system and detection method
AssigneeRicoh Company, Ltd.
InventorsMichiaki Shinotsuka, Syuji Kubota
Life of this patent
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Abstract
A detection device configured to detect an object includes a first light source configured to emit infrared as first light in a first direction, a second light source configured to emit second light in a second direction different from the first direction, a shield to shield a portion of an optical path from the second light source, to allow a portion of the second light to pass, a light-receiving device configured to receive the first light reflected from the object and the portion of the second light reflected from the object, and circuitry configured to detect presence or absence of the object based on reception of reflected light by the detector. The second light is different from the first light.
Claims9
A detection device configured to detect an object, the detection device comprising:
- a first light source configured to emit infrared as first light in a first direction;
- a second light source configured to emit second light in a second direction different from the first direction, the second light different from the first light;
- a shield disposed to shield a portion of an optical path from the second light source, to allow a portion of the second light to pass;
- a light receiving detector to detect the first light reflected from the object without the first light being shielded from the detector by the shield and to detect the portion of the second light reflected from the object;
- and
- circuitry configured to detect presence or absence of the object based on reception of reflected light by the detector.
A method for detecting an object, the method comprising:
- emitting, as first light, infrared in a first direction;
- emitting second light in a second direction different from the first direction, the second light different from the first light;
- shielding a part of the second light, to allow a portion of the second light to pass;
- receiving the first light reflected from the object without the first light being shielded and the portion of the second light reflected from the object;
- and
- detecting presence or absence of the object based on reception of reflected light from the object.
A detection device configured to detect an object, the detection device comprising:
- a first light source configured to emit infrared as first light in a first direction;
- a second light source configured to emit second light in a second direction different from the first direction, the second light different from the first light;
- a shield disposed to shield a portion of an optical path from the second light source, to allow a portion of the second light to pass;
- a light receiving detector configured to detect the first light reflected from the object and the portion of the second light reflected from the object;
- circuitry configured to detect presence or absence of the object based on reception of reflected light by the detector;
- and
- a board inclined with respect to a vertical direction, the board including:
- a first face on which the first light source and the second light source are disposed;
- and
- a second face opposite the first face, the second face on which the detector is disposed.
Dependencies are inferred from the claim text.