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US 2010/0073683 A1Published application
Reflective photoelectric sensor and object detecting method
AssigneeYamatake Corporation
InventorTatsuya Ueno
Life of this patent
Estimating the term…
Abstract
To reduce the probability of incorrect determination to detect an object reliably. A reflective photoelectric sensor is provided with: a light projecting device for emitting light; a light receiving device for receiving the optical feedback of the light that is emitted from the light projecting device; a determining portion for determining whether or not an object exists in the direction in which the light is emitted from the light projecting device, based on the optical feedback; and a reflection preventing plate of a moth-eye structure, disposed at a position that is on the optical path of the light that is emitted from the light projecting device at a position that is more distant than the location wherein the object is anticipated to appear.
Claims14
A reflective photoelectric sensor comprising:
- light projector emitting light;
- light receiver receiving optical feedback from the light emitted from the light projector;
- evaluator determining whether or not an object exists in the direction in which the light is emitted from the light projector, based on the optical feedback;
- and
- a reflection preventing plate having a moth-eye structure, disposed at a position on the optical path of the light that is emitted from the light projecting means at a position that is more distant than the location at which the object is anticipated to appear.
2 more elements
A reflective photoelectric sensor comprising:
- a semiconductor laser emitting a laser light;
- a laser driver driving the semiconductor laser;
- light receiver for converting into an electric signal the laser light that is emitted from the semiconductor laser and an optical feedback from this laser light;
- distance determination processor for calculating the distance of the point of reflection of the optical feedback, based on information for an interference waveform that is generated by the laser light and the optical feedback, included in the output information of the light receiver, to determine that an object exists in the direction in which the laser light is emitted, if this distance is closer than a predetermined reference distance;
- and
- a reflection preventing plate having an amorphous structure, disposed at a position on the optical path of the laser light that is emitted from the semiconductor laser at a position that is more distant than the location at which the object is anticipated to appear.
3 more elements
A reflective collector sensor comprising:
- a semiconductor laser emitting a laser light;
- a laser driver driving the semiconductor laser;
- detector detecting an electric signal that includes an interference waveform that is produced through the self-coupling effect between the laser light that is emitted from the semiconductor laser and optical feedback of this laser light;
- distance determination processor transmitting the distance of the point of reflection of the optical feedback, based on the interference waveform information that is included in the output signal from the detector, to determine that an object exists in the direction of the emission of the laser light if the distance is closer than a predetermined reference distance;
- and
- a reflection preventing plate having an amorphous structure, disposed at a position on the optical path of the laser light that is emitted from the semiconductor laser at a position that is more distant than the location at which the object is anticipated to appear.
3 more elements
An object detecting method comprising the steps of:
- emitting light based on a light projecting procedure;
- receiving optical feedback of the light emitted in the light projecting procedure based on a light receiving procedure;
- and
- determining whether or not an object exists in the direction in which light is emitted in the light projecting procedure, based on the optical feedback based on a determining procedure;
- wherein:
- a reflection preventing plate of a moth-eye structure is disposed at a position on the optical path of the light that is emitted in the light projecting procedure at a position that is more distant than the location at which the object is anticipated to appear.
3 more elements
An object detecting method comprising the steps of:
- supplying a driving electric current to a semiconductor laser to cause the semiconductor laser to operate based on an oscillating procedure;
- converting into an electric signal the laser light emitted from the semiconductor laser and the optical feedback of that laser light based on a light receiving procedure;
- and
- calculating the distance of the point of reflection of the optical feedback based on interference waveform information generated by the laser light and the optical feedback included in the output signal obtained from the light receiving procedure to determine that an object exists in the direction in which the laser light is emitted when this distance is closer than a predetermined reference distance based on a distance determination processing procedure;
- wherein
- a reflection preventing plate of a moth-eye structure is disposed at a position on the optical path of the laser light that is emitted from the semiconductor laser at a position that is more distant than the location at which the object is anticipated to appear.
3 more elements
An object detecting method, comprising the steps of:
- supplying a driving electric current to a semiconductor laser to cause the semiconductor laser to operate based on an oscillating procedure;
- detecting an electric signal including an interference waveform produced through the self-coupling effect of the laser light that is emitted from the semiconductor laser and the optical feedback from the laser light based on a detecting procedure;
- and
- calculating the distance of the point of reflection of the optical feedback based on interference waveform information included in the output signal obtained in the detecting procedure to determine that an object exists in the direction in which the laser light is emitted when this distance is closer than a predetermined reference distance based on a distance determination processing procedure;
- wherein:
- a reflection preventing plate of a moth-eye structure is disposed at a position on the optical path of the laser light that is emitted from the semiconductor laser at a position that is more distant than the location at which the object is anticipated to appear.
3 more elements
Dependencies are inferred from the claim text.