Fingerprint sensor
First Claim
1. A fingerprint sensor for transforming the fingerprint information of a finger under investigation into an electric output signal, comprising in combination:
- (a) a contact device containing a piezoelectric material, said contact device having surfaces including a contact surface for exercising a contact pressure thereon by means of said finger, thereby changing the density of electric charges on said surfaces according to the fingerprint pattern of said finger; and
(b) electrical means for providing the electric output signal in accordance with the distribution of said charges on at least one of said surfaces.
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Accused Products
Abstract
The fingerprint sensor transforms the fingerprint information of a finger under investigation into an electric output signal. The sensor incorporates a contact device or sensor plate of a piezoelectric material. This sensor plate has a contact surface. The finger exercises a contact pressure thereon and changes thereby the distribution of electric charges on the contact surface. The new charge distribution is in accordance with the fingerprint pattern of the finger. The sensor further incorporates an electric device which provides the electric output signal in accordance with the distribution of charges.
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Citations
19 Claims
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1. A fingerprint sensor for transforming the fingerprint information of a finger under investigation into an electric output signal, comprising in combination:
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(a) a contact device containing a piezoelectric material, said contact device having surfaces including a contact surface for exercising a contact pressure thereon by means of said finger, thereby changing the density of electric charges on said surfaces according to the fingerprint pattern of said finger; and (b) electrical means for providing the electric output signal in accordance with the distribution of said charges on at least one of said surfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification