Patent US5757278A successfully refreshed from Google Patents.
US5757278A
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US
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Personal verification system
Assignee: Toshiba Corp
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Filing: 1995-12-18
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Granted: 1998-05-26
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Expires: 2015-12-18
Abstract
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.
Inventors
- 👤 Kazuhiro Itsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:11
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/13; G06V40/1306
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
75 words
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.
Claim 2
Dependent Claim
75 words
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.
Claim 3
Dependent Claim
29 words
A personal verification system according to claim 1, wherein the detector serially detects values of resistance between two of the linear electrodes along a longitudinal direction of the finger.
Claim 4
Dependent Claim
20 words
A personal verification system according to claim 2, wherein the two of the linear electrodes are adjacent to each other.
Claim 5
Dependent Claim
23 words
A personal verification system according to claim 1, wherein the porous film has a mark on which the finger is to be placed.
Claim 6
Dependent Claim
29 words
A personal verification system according to claim 1, wherein the porous film is formed of an organic material selected from a group including of fluoroplastics, polycarbonate and cellulose acetate.
Claim 7
Dependent Claim
35 words
A personal verification system according to claim 1, wherein the porous film covers a predetermined portion of the linear electrodes, and has a portion which does not transmit water vapor except for the predetermined portion.
Claim 8
Dependent Claim
37 words
A personal verification system according to claim 6, wherein the detector detects the change in resistance across the linear electrodes with reference to resistance across linear electrodes covered by the portion which does not transmit water vapor.
Claim 9
Dependent Claim
17 words
A personal verification system according to claim 1, wherein the porous film is formed of antibacterial material.
Claim 10
Dependent Claim
41 words
A personal verification system according to claim 1, wherein the porous film includes pores which are formed between a surface of the porous film and at least one of the linear electrodes, and formed between adjacent two of the linear electrodes.
Claim 11
Dependent Claim
118 words
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; 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 μm.
Claim 12
Dependent Claim
118 words
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; 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 μm.
Claim 13
Dependent Claim
29 words
A personal verification system according to claim 10, wherein the detector serially detects values of resistance between two of the linear electrodes along a longitudinal direction of the finger.
Claim 14
Dependent Claim
20 words
A personal verification system according to claim 11, wherein the two of the linear electrodes are adjacent to each other.
Claim 15
Dependent Claim
23 words
A personal verification system according to claim 10, wherein the porous film has a mark on which the finger is to be placed.
Claim 16
Dependent Claim
29 words
A personal verification system according to claim 10, wherein the porous film is formed of an organic material selected from the group consisting of fluoroplastics, polycarbonates and cellulose acetates.
Claim 17
Dependent Claim
35 words
A personal verification system according to claim 10, wherein the porous film covers a predetermined portion of the linear electrodes, and has a portion which does not transmit water vapor except for the predetermined portion.
Claim 18
Dependent Claim
37 words
A personal verification system according to claim 15, wherein the detector detects the change in resistance across the linear electrodes with reference to resistance across linear electrodes covered by the portion which does not transmit water vapor.
Claim 19
Dependent Claim
17 words
A personal verification system according to claim 10, wherein the porous film is formed of antibacterial material.
Claim 20
Dependent Claim
41 words
A personal verification system according to claim 10, wherein the porous film includes pores which are formed between a surface of the porous film and at least one of the linear electrodes, and formed between adjacent two of the linear electrodes.
Claim 21
Dependent Claim
87 words
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 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.
Claim 22
Dependent Claim
87 words
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 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.
Claim 23
Dependent Claim
29 words
A personal verification system according to claim 19, wherein the detector serially detects values of resistance between two of the linear electrodes along a longitudinal direction of the finger.
Claim 24
Dependent Claim
20 words
A personal verification system according to claim 20, wherein the two of the linear electrodes are adjacent to each other.
Claim 25
Dependent Claim
23 words
A personal verification system according to claim 19, wherein the porous film has a mark on which the finger is to be placed.
Claim 26
Dependent Claim
29 words
A personal verification system according to claim 19, wherein the porous film is formed of an organic material selected from the group consisting of fluoroplastics, polycarbonates and cellulose acetates.
Claim 27
Dependent Claim
35 words
A personal verification system according to claim 19, wherein the porous film covers a predetermined portion of the linear electrodes, and has a portion which does not transmit water vapor except for the predetermined portion.
Claim 28
Dependent Claim
37 words
A personal verification system according to claim 24, wherein the detector detects the change in resistance across the linear electrodes with reference to resistance across linear electrodes covered by the portion which does not transmit water vapor.
Claim 29
Dependent Claim
17 words
A personal verification system according to claim 19, wherein the porous film is formed of antibacterial material.
Claim 30
Dependent Claim
41 words
A personal verification system according to claim 19, wherein the porous film includes pores which are formed between a surface of the porous film and at least one of the linear electrodes, and formed between adjacent two of the linear electrodes.
Claim 31
Dependent Claim
50 words
A personal verification system according to claim 19, wherein the porous film includes pores which have a diameter equal to or smaller than 1 mm, the pore ratio of the porous film 5 to 50%, and a thickness of the porous film is equal to or less than 100 μm.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |