Biometric sensor with diverging optical element
AssigneeSynaptics Incorporated
InventorsYoung Seen Lee, Paul Wickboldt, Robert John Gove, Bob Lee Mackey
Life of this patent
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Abstract
An optical biometric sensor includes an array of light sensing elements, an array of diverging optical elements, and an array of apertures disposed between the array of light sensing elements and the array of diverging optical elements. Light incident on the diverging optical elements within a limited acceptance angle passes through the apertures and towards the light sensing elements and light incident on the diverging optical elements outside of the limited acceptance angle diverges away from the apertures.
Claims35
An optical biometric sensor, comprising:
- an array of light sensing elements;
- an array of diverging optical elements;
- and
- an array of apertures disposed between the array of light sensing elements and the array of diverging optical elements,
- wherein light incident on the diverging optical elements within a limited acceptance angle passes through the apertures and towards the light sensing elements and wherein light incident on the diverging optical elements outside of the limited acceptance angle diverges away from the apertures.
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A method for making an optical biometric sensor, comprising:
- forming an array of light sensing elements in a substrate;
- forming an array of apertures on the substrate;
- forming an array of diverging optical elements on the array of apertures, wherein the array of apertures is disposed between the array of light sensing elements and the array of diverging optical elements,
- wherein the array of diverging optical elements is arranged such that light incident on the diverging optical elements within a limited acceptance angle passes through the apertures and towards the light sensing elements and such that light incident on the diverging optical elements outside of the limited acceptance angle diverges away from the apertures.
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An input device for imaging a biometric object, comprising:
- an input surface;
- an optical image sensor for sensing a biometric object at the input surface;
- and
- a display cover lens positioned between the optical image sensor and the input surface;
- wherein the optical image sensor comprises:
- an array of light sensing elements;
- an array of diverging optical elements;
- and
- an array of apertures disposed between the array of light sensing elements and the array of diverging optical elements,
- wherein light incident on the diverging optical elements from the input surface within a limited acceptance angle passes through the apertures and towards the light sensing elements and wherein light incident on the diverging optical elements from the input surface outside of the limited acceptance angle diverges away from the apertures.
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Dependencies are inferred from the claim text.