Optical biometric sensor having diffractive optical elements
AssigneeSynaptics Incorporated
InventorsBob Lee Mackey, Richard Andrew Klenkler
Life of this patent
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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.
Claims21
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 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.
An optical fingerprint sensor for imaging a fingerprint, wherein the optical fingerprint sensor comprises:
- 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 the plurality of diffractive optical elements of the optical layer are configured to direct light from the fingerprint to the plurality of sensing elements.
A system for imaging a biometric object, the system comprising:
- 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 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;
- 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.
Dependencies are inferred from the claim text.