Personal verification system
First Claim
1. A personal verification system comprising:
- a plurality of linear electrodes arranged on a substrate;
a non-conductive porous film formed of a material which repels water and transmits water vapor arranged on the plurality of linear electrodes; and
detector for detecting a change in resistance across the linear electrodes based on transmitted water vapor, when a finger is placed on the porous film in a direction substantially perpendicular to a longitudinal direction of the linear electrodes.
1 Assignment
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Accused Products
Abstract
A plurality of linear electrodes, which are perpendicular to the longitudinal direction of a finger to be measured, are arranged on a substrate. A porous film is placed on the electrodes. The porous film repels water, such as waterdrop, but transmits water vapor. When the finger is pressed against the porous film, water (sweat) diffused through sweat pores of projected portions of the finger surface is further diffused through holes of the porous film and reaches to the electrode located just under the projected portions of the finger surface. At this time, the resistance of the portion between the electrodes, to which the water reaches, is lowered due to ions existing in the water. Resistances across adjacent electrodes are serially read and synthesized, thereby obtaining fingerprint information.
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Citations
28 Claims
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1. A personal verification system comprising:
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a plurality of linear electrodes arranged on a substrate; a non-conductive porous film formed of a material which repels water and transmits water vapor arranged on the plurality of linear electrodes; and detector for detecting a change in resistance across the linear electrodes based on transmitted water vapor, when a finger is placed on the porous film in a direction substantially perpendicular to a longitudinal direction of the linear electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A personal verification system comprising:
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a plurality of linear electrodes arranged on a substrate; a non-conductive porous film formed of a material which repels water and transmits water vapor arranged on the plurality of linear electrodes; and detector for detecting a change in resistance across the linear electrodes based on transmitted water vapor, when a finger is placed on the porous film in a direction substantially perpendicular to a longitudinal direction of the linear electrodes; wherein the porous film includes pores which have a diameter equal to or smaller than 1 mm, the pore ratio of the porous film is 5 to 50%, and a thickness of the porous film is equal to or less than 100 μ
m. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A personal verification system comprising:
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a plurality of linear electrodes arranged on a substrate; a non-conductive porous film formed of a material which repels water and transmits water vapor arranged on the plurality of linear electrodes and substantially in contact with all of the plurality of linear electrodes; and detector for detecting a change in resistance across the linear electrodes based on transmitted water vapor, when a finger is placed on the porous film in a direction substantially perpendicular to a longitudinal direction of the linear electrodes. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification