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US 2003/0214656 A1Published application
Optical object identification device and printing apparatus using the same
AssigneeSharp Kabushiki Kaisha
InventorsAkifumi Yamaguchi, Hisakazu Sugiyama
Life of this patent
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Abstract
An optical object identification device has a light emission element, an optical system condensing light from the light emission element, a photodetector integrated with a mask provided with a pinhole, and an identification unit for identifying a type of a measurement object by an output waveform from the photodetector.
Claims17
An optical object identification device comprising:
- a light emission element;
- an optical system condensing light emitted from the light emission element to cast the light on a measurement object moving in a specified direction and thereby to form a light spot having a specified spot diameter on the measurement object, and condensing light reflected from at least an area of the light spot;
- a mask provided with a pinhole passing at least part of the reflected light condensed by the optical system;
- a photodetector on which the light passed through the pinhole is incident;
- and
- an identification unit for identifying a type of the measurement object on basis of an output waveform from the photodetector.
3 more elements
An optical object identification device comprising:
- a light emission element;
- an optical system condensing light emitted from the light emission element to cast parallel light on a measurement object moving in a specified direction, the parallel light having an axis generally perpendicular to a plane surface of the measurement object, and thereby to form a light spot having a specified spot diameter on the measurement object, and that condensing light reflected from the light spot;
- a two-division photodetector on which the reflected light condensed by the optical system is incident;
- and
- an identification unit for identifying a type of the measurement object on basis of an output waveform from the two-division photodetector.
2 more elements
An optical object identification device comprising:
- a light emission element;
- an optical system condensing light emitted from the light emission element to cast parallel light on a measurement object moving in a specified direction, the parallel light having an axis generally perpendicular to a plane surface of the measurement object, and thereby to form a light spot having a specified spot diameter on the measurement object, and condensing light reflected from the light spot;
- a position sensitive photodetector on which the reflected light condensed by the optical system is incident;
- and
- an identification unit for identifying a type of the measurement object on basis of an output waveform from the position sensitive photodetector.
2 more elements
Dependencies are inferred from the claim text.