Optical biometric sensor having diffractive optical elements
First Claim
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1. An optical sensor for imaging a biometric object, the optical sensor comprising:
- a cover layer transparent to light reflected off the biometric object;
an optical layer, disposed below the cover layer, having a plurality of diffractive optical elements; and
a sensing layer, having a plurality of sensing elements disposed below the optical layer, each of the sensing elements being configured to detect light from the biometric object;
wherein each of the plurality of diffractive optical elements of the optical layer is configured to diffract and direct light from the biometric object to one or more of the plurality of sensing elements;
wherein the plurality of diffractive optical elements comprises one or more binary zone plates.
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Abstract
An optical sensor for imaging a biometric object includes: a cover layer transparent to light reflected off the biometric object; an optical layer, disposed below the cover layer, having a plurality of diffractive optical elements; and a sensing layer, having a plurality of sensing elements disposed below the optical layer, each of the sensing elements being configured to detect light from the biometric object. The plurality of diffractive optical elements of the optical layer are configured to direct light from the biometric object to the plurality of sensing elements.
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Citations
24 Claims
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1. An optical sensor for imaging a biometric object, the optical sensor comprising:
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a cover layer transparent to light reflected off the biometric object; an optical layer, disposed below the cover layer, having a plurality of diffractive optical elements; and a sensing layer, having a plurality of sensing elements disposed below the optical layer, each of the sensing elements being configured to detect light from the biometric object; wherein each of the plurality of diffractive optical elements of the optical layer is configured to diffract and direct light from the biometric object to one or more of the plurality of sensing elements; wherein the plurality of diffractive optical elements comprises one or more binary zone plates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical fingerprint sensor for imaging a fingerprint, wherein the optical fingerprint sensor comprises:
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a cover layer transparent to light reflected off the fingerprint; an optical layer, disposed below the optical layer, having a plurality of diffractive optical elements; and a sensing layer, having a plurality of sensing elements disposed below the optical layer, wherein each of the plurality of sensing elements are configured to detect light from the fingerprint; wherein each of the plurality of diffractive optical elements of the optical layer is configured to diffract and direct light from the fingerprint to one or more of the plurality of sensing elements; and wherein the plurality of diffractive optical elements comprises one or more binary zone plates. - View Dependent Claims (10, 11)
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12. A system for imaging a biometric object, the system comprising:
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an optical sensor, comprising; a cover layer transparent to light reflected off the biometric object; an optical layer, disposed below the cover layer, having a plurality of diffractive optical elements; and a sensing layer, having a plurality of sensing elements disposed below the optical layer; wherein each of the plurality of diffractive optical elements of the optical layer is configured to diffract and direct light from the biometric object to the plurality of sensing elements, and wherein the plurality of diffractive optical elements comprises one or more binary zone plates; and a processing system, connected to the plurality of sensing elements, configured to obtain image data from the plurality of sensing elements and compare the obtained image data to a reference template. - View Dependent Claims (13, 14, 15, 16)
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17. An optical sensor for imaging a biometric object, the optical sensor comprising:
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a cover layer transparent to light reflected off the biometric object; an optical layer, disposed below the cover layer, having a plurality of diffractive optical elements; and a sensing layer, having a plurality of sensing elements disposed below the optical layer, each of the sensing elements being configured to detect light from the biometric object; wherein each of the plurality of diffractive optical elements of the optical layer is configured to diffract and direct light from the biometric object to one or more of the plurality of sensing elements; wherein the plurality of diffractive optical elements comprises one or more photon sieves. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification