Swiped aperture capacitive fingerprint sensing systems and methods
First Claim
1. Image sensing apparatus comprising:
- at least one image pickup plate disposed generally laterally with respect to a direction of movement of an object; and
a plurality of image drive plates in spaced relation to said image pickup plate to define a plurality of sensor gaps, wherein features of the object passing over said sensor gaps produce a change in capacitance between respective image drive plates and said image pickup plate.
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Abstract
A fingerprint sensing system includes an image sensor, a rate sensor and a sensor circuit. The image sensor includes a linear array of capacitive sensors for capacitive sensing of ridge peaks and ridge valleys of a fingerprint on a swiped finger. The rate sensor senses the speed of the finger as it is swiped across the image sensor. The sensor circuit supplies image drive signals to the image sensor and detects image signals in response to the drive signals. The sensor circuit supplies rate drive signals to the rate sensor and detects rate signals in response to the rate drive signals. The sensor circuit further coordinates the image signals and the rate signals to provide a fingerprint image. The image sensor may be configured as an image pickup plate and multiple image drive plates formed on a substrate, such as a flexible printed circuit board or other flexible substrate which may conform to the shape of the finger.
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Citations
78 Claims
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1. Image sensing apparatus comprising:
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at least one image pickup plate disposed generally laterally with respect to a direction of movement of an object; and
a plurality of image drive plates in spaced relation to said image pickup plate to define a plurality of sensor gaps, wherein features of the object passing over said sensor gaps produce a change in capacitance between respective image drive plates and said image pickup plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 69)
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20. Rate sensing apparatus comprising:
two or more object detectors spaced apart along a direction of movement of an object, each of said object detectors including at least one rate drive plate and at least one rate pickup plate, wherein an end of an object passing over each of said object detectors produces a change in capacitance between respective rate drive plates and rate pickup plates. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 70)
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35. A fingerprint sensing system comprising:
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an image sensor comprising a linear array of capacitive sensors for capacitive sensing of ridge peaks and ridge valleys of a fingerprint on a moving finger;
a rate sensor for sensing a speed of the finger as it moves across said image sensor; and
a sensor circuit for excitation of said image sensor with image drive signals and for detection of image signals in response to said image drive signals, for excitation of said rate sensor with rate drive signals and for detection of rate signals in response to said rate drive signals, and for coordinating said image signals and said rate signals to provide a fingerprint image. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 71, 72)
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67. A fingerprint sensing method, comprising the steps of:
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capacitively sensing ridge peaks and ridge valleys of a fingerprint on a swiped finger with a linear array of capacitive sensors and providing image signals representative of a line of the fingerprint; and
acquiring from the linear array of capacitive sensors image signals representative of multiple lines of the fingerprint to provide a fingerprint image.
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68. A fingerprint sensing method, comprising the steps of:
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capacitively sensing ridge peaks and ridge valleys of a fingerprint on a swiped finger with a linear array of capacitive sensors and providing image signals;
sensing a speed of the finger as it is swiped across the linear array of capacitive sensors and providing rate signals; and
coordinating the image signals and the rate signals to provide a fingerprint image.
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73. A capacitive sensor comprising:
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at least one pickup plate; and
a plurality of drive plates in spaced relation to said pickup plate to define an array of sensor gaps, said pickup plate and said plurality of drive plates being substantially coplanar, wherein an object passing above said array of sensor gaps produces a change in capacitance between respective drive plates and said pickup plate. - View Dependent Claims (74, 75, 76, 77, 78)
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Specification