WO1999008121A1 - Procede pour determiner de tres faibles capacites et detecteur conçu a cet effet - Google Patents
Procede pour determiner de tres faibles capacites et detecteur conçu a cet effet Download PDFInfo
- Publication number
- WO1999008121A1 WO1999008121A1 PCT/DE1998/002078 DE9802078W WO9908121A1 WO 1999008121 A1 WO1999008121 A1 WO 1999008121A1 DE 9802078 W DE9802078 W DE 9802078W WO 9908121 A1 WO9908121 A1 WO 9908121A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- measuring
- voltage
- capacitors
- metal surfaces
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measuring Fluid Pressure (AREA)
- Image Input (AREA)
Abstract
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA00001276A MXPA00001276A (es) | 1997-08-05 | 1998-07-23 | Procedimiento para la determinacion de capacidades muy pequenas y sensor asi conceptualizado. |
KR1020007001166A KR20010022575A (ko) | 1997-08-05 | 1998-07-23 | 매우 작은 캐패시턴스를 결정하기 위한 방법 및 센서 |
EP98945041A EP1000362A1 (fr) | 1997-08-05 | 1998-07-23 | Procede pour determiner de tres faibles capacites et detecteur con u a cet effet |
BR9811837-4A BR9811837A (pt) | 1997-08-05 | 1998-07-23 | Processo para a determinação de capacidades muito pequenas e sensor assim projetado |
JP2000506535A JP2001512836A (ja) | 1997-08-05 | 1998-07-23 | 非常に小さな容量を求めるための方法およびこれにより構想されたセンサ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19733865 | 1997-08-05 | ||
DE19733865.8 | 1997-08-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999008121A1 true WO1999008121A1 (fr) | 1999-02-18 |
Family
ID=7838065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/002078 WO1999008121A1 (fr) | 1997-08-05 | 1998-07-23 | Procede pour determiner de tres faibles capacites et detecteur conçu a cet effet |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1000362A1 (fr) |
JP (1) | JP2001512836A (fr) |
KR (1) | KR20010022575A (fr) |
CN (1) | CN1266494A (fr) |
BR (1) | BR9811837A (fr) |
MX (1) | MXPA00001276A (fr) |
WO (1) | WO1999008121A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100394202C (zh) * | 2006-01-24 | 2008-06-11 | 东北大学 | 高压交流激励法微小电容测量电路 |
US10275635B2 (en) | 2016-01-04 | 2019-04-30 | Boe Technology Group Co., Ltd. | Fingerprint detection circuit and driving method thereof, and display device |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4511064B2 (ja) * | 2001-03-05 | 2010-07-28 | 三菱電機株式会社 | 凹凸検出センサ |
DE10333154A1 (de) * | 2003-07-22 | 2005-02-24 | Vega Grieshaber Kg | Verfahren und Schaltungsanordnung zum Auswerten einer Messkapazität |
JP4036798B2 (ja) * | 2003-07-29 | 2008-01-23 | アルプス電気株式会社 | 容量検出回路および検出方法並びに指紋センサ |
US7075316B2 (en) * | 2003-10-02 | 2006-07-11 | Alps Electric Co., Ltd. | Capacitance detector circuit, capacitance detection method, and fingerprint sensor using the same |
CN101526989B (zh) * | 2008-03-06 | 2011-02-09 | 奇景光电股份有限公司 | 电容式指纹感应器及其面板 |
FR2938344B1 (fr) * | 2008-11-07 | 2010-11-19 | Continental Automotive France | Dispositif de mesure d'une variation de la capacitance d'une structure capacitive variable |
JP5874505B2 (ja) * | 2012-04-10 | 2016-03-02 | オムロン株式会社 | 振動エネルギー検出装置、振動エネルギー検出システム |
CN103679163B (zh) * | 2012-09-18 | 2017-03-22 | 成都方程式电子有限公司 | 新型电容式指纹图像采集系统 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4039940A (en) * | 1976-07-30 | 1977-08-02 | General Electric Company | Capacitance sensor |
EP0509915A1 (fr) * | 1991-04-18 | 1992-10-21 | Marelli Autronica | Procédé et dispositif de mesure de condensateur |
WO1997017668A1 (fr) * | 1995-11-06 | 1997-05-15 | Dew Engineering & Development Ltd. | Dispositif d'imagerie par contact |
-
1998
- 1998-07-23 EP EP98945041A patent/EP1000362A1/fr not_active Withdrawn
- 1998-07-23 JP JP2000506535A patent/JP2001512836A/ja active Pending
- 1998-07-23 CN CN98808036A patent/CN1266494A/zh active Pending
- 1998-07-23 MX MXPA00001276A patent/MXPA00001276A/es unknown
- 1998-07-23 KR KR1020007001166A patent/KR20010022575A/ko not_active Application Discontinuation
- 1998-07-23 WO PCT/DE1998/002078 patent/WO1999008121A1/fr not_active Application Discontinuation
- 1998-07-23 BR BR9811837-4A patent/BR9811837A/pt not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4039940A (en) * | 1976-07-30 | 1977-08-02 | General Electric Company | Capacitance sensor |
EP0509915A1 (fr) * | 1991-04-18 | 1992-10-21 | Marelli Autronica | Procédé et dispositif de mesure de condensateur |
WO1997017668A1 (fr) * | 1995-11-06 | 1997-05-15 | Dew Engineering & Development Ltd. | Dispositif d'imagerie par contact |
Non-Patent Citations (1)
Title |
---|
TARTAGNI M ET AL: "FP 12.3: A 390DPI LIVE FINGERPRINT IMAGER BASED ON FEEDBACK CAPACITIVE SENSING SCHEME", IEEE INTERNATIONAL SOLID STATE CIRCUITS CONFERENCE, vol. 40, February 1997 (1997-02-01), pages 200/201, 456, XP000753070 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100394202C (zh) * | 2006-01-24 | 2008-06-11 | 东北大学 | 高压交流激励法微小电容测量电路 |
US10275635B2 (en) | 2016-01-04 | 2019-04-30 | Boe Technology Group Co., Ltd. | Fingerprint detection circuit and driving method thereof, and display device |
Also Published As
Publication number | Publication date |
---|---|
BR9811837A (pt) | 2000-08-15 |
KR20010022575A (ko) | 2001-03-26 |
MXPA00001276A (es) | 2002-03-27 |
EP1000362A1 (fr) | 2000-05-17 |
CN1266494A (zh) | 2000-09-13 |
JP2001512836A (ja) | 2001-08-28 |
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