Skin detection sensor
First Claim
Patent Images
1. A device for detecting the presence of skin, comprising:
- an illuminator source for providing a blue LED light source capable of being reflected from skin;
a detector for receiving said light source after said source has contacted said skin and for providing a signal representative of said reflected light source; and
a detector processing unit for comparing said signal with a known value indicating the presence of skin.
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Abstract
A device for detecting the presence of human skin including an illuminator source for providing an IR band at a predetermined frequency known as a blue LED. The IR band frequency ranges from about 400 nanometers (nm) to about 500 nm, and preferably from about 450 nm to about 485 nm. Most preferred is a blue LED with a frequency of about 468 nm. The band is reflected off a target and received by a sensor such as a photo detector. The value for human skin is compared to the signal detected. Other materials that have been used to spoof detectors have different values and thus are distinguished from human skin.
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Citations
18 Claims
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1. A device for detecting the presence of skin, comprising:
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an illuminator source for providing a blue LED light source capable of being reflected from skin; a detector for receiving said light source after said source has contacted said skin and for providing a signal representative of said reflected light source; and a detector processing unit for comparing said signal with a known value indicating the presence of skin. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for detecting the presence of skin, comprising:
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illuminator source means for providing a blue LED light source capable of being reflected from skin; detector means for receiving said light source after said source has contacted said skin and for providing a signal representative of said reflected light source; and detector processing unit means for comparing said signal with a known value indicating the presence of skin. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for detecting the presence of skin, comprising the steps of:
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providing a blue LED light source capable of being reflected from skin; directing said blue LED light source against an object proposed to be human skin; positioning a detector to receive said light source after said source has contacted said skin and providing a signal representative of said reflected light source; and comparing said signal with a known value indicating the presence of skin; whereby values outside said known value indicate the presence of a material other than human skin. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification