Title:
【発明の名称】近接センサ
Document Type and Number:
Japanese Patent JP2003505675
Kind Code:
A
Abstract:
A sense electrode (12) is driven by a first oscillatory signal (26) and at least one control electrode (14) is driven by a second oscillatory signal (30). In first (38) and second (40) states (36), the second oscillatory signal (30) respectively has a first and second phase with respect to the first oscillatory signal (26). The proximity of an electric-field-influencing media (20) to the proximity sensor (10) is responsive to the difference of third (50) and fourth (52) signals that are respectively measured when the second oscillatory signal (30) is in respective first (38) and second (40) states. The proximity sensor (10) is calibrated with a known capacitance operatively coupled to the sense electrode (12) with a plurality of switches (S1, S2) adapted so that the switches (S1, S2) have a relatively small effect on the capacitance of the sense electrode (12).
Inventors:
McDonnell, Judson Gee.
Stanley, James G.
Stanley, James G.
Application Number:
JP2001511650A
Publication Date:
February 12, 2003
Filing Date:
July 17, 2000
Export Citation:
Assignee:
Automotive Systems Laboratory Inc.
International Classes:
G01B7/00; B60N2/00; B60N2/28; B60R21/01; G01B7/02; G01R27/26; G01V3/08; G08B13/26; H01H36/00; H03K17/955; B60R21/015; (IPC1-7): G01B7/00; G01R27/26; H01H36/00
Domestic Patent References:
| JPS62277517A | 1987-12-02 | |||
| JPS6459010A | 1989-03-06 | |||
| JPH0658967A | 1994-03-04 | |||
| JPH0729467A | 1995-01-31 | |||
| JPH08159705A | 1996-06-21 | |||
| JPH09280806A | 1997-10-31 | |||
| JPH10103913A | 1998-04-24 | |||
| JPH10508944A | 1998-09-02 | |||
| JP2000048694A | 2000-02-18 | |||
| JP2000505550A | 2000-05-09 | |||
| JP2000513864A | 2000-10-17 | |||
| JP2000515253A | 2000-11-14 |
Foreign References:
| WO1997047976A2 | 1997-12-18 | |||
| DE4006119A1 | 1991-08-29 |
Attorney, Agent or Firm:
Kiyokazu