Title:
【発明の名称】近接センサ
Document Type and Number:
Japanese Patent JP2002538469
Kind Code:
A
Abstract:
A sense electrode (12) and a plurality of control electrodes (14) are located proximate to a region of space (18) for sensing an object (20) therein. A first signal (26) and a plurality of second signals (30) respectively applied to the sense (12) and control (14) electrodes generate an electric field (16) within the region of space (18). The capacitance of the sense electrode (12) is measured for various electric field configurations responsive to the second signals (30) and to the proximity of the object (20). A most likely proximity scenario from a priori proximity scenarios is determined from the plurality of capacitance measurements. A front driven shield (36) is provided between the sense electrode (12) and the region of space (18) for selectively shielding the sense electrode (12) from influence by objects (20) or grounds, so as to provide for calibrating the measurement circuit (32) to compensate for parasitic capacitance and gain drift.
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Inventors:
McDonnell, Judson Gee.
Stanley, James G.
Stanley, James G.
Application Number:
JP2000603002A
Publication Date:
November 12, 2002
Filing Date:
March 06, 2000
Export Citation:
Assignee:
Automotive Systems Laboratory Inc.
International Classes:
B60N2/00; B60N2/28; B60R21/01; G01B7/02; G01V3/08; G08B13/26; H03K17/955; B60R21/015; (IPC1-7): G01V3/08; G01R27/26; H01H36/00; H03K17/955
Domestic Patent References:
| JPH10236267A | 1998-09-08 | |||
| JPH09309373A | 1997-12-02 | |||
| JPH04372437A | 1992-12-25 | |||
| JPH1111256A | 1999-01-19 | |||
| JPH03225719A | 1991-10-04 | |||
| JPH1048346A | 1998-02-20 |
Attorney, Agent or Firm:
Kiyokazu