Title:
静電容量式変位検出システムおよび方法に使用される信号平衡シールド電極構成
Document Type and Number:
Japanese Patent JP4495163
Kind Code:
B2
Abstract:
A capacitive encoder includes a signal-balanced shield electrode configuration that does not require electrical ground connection or active sensing and control in order to maintain the shield electrode(s) at a sufficiently constant voltage during capacitive position measurements. The shield electrode configuration is positioned in a capacitive coupling gap between transmitter electrodes and receiver electrodes during operation. The shield electrode configuration is patterned in a manner that complements the layout of the transmitter electrodes, such that the shield electrode configuration inherently floats at a nominally constant electrical potential when coupled to the signals present on the transmitter electrodes. The resulting capacitive encoder is thus more economical to build, convenient to install, and reliable during operation than capacitive encoders which use an electrical connection, compensation drive circuitry, or grounding in order to control the potential of a shield member that operates at a potential that is not inherently constant.
Inventors:
Undermo, Nils E.
Application Number:
JP2006538464A
Publication Date:
June 30, 2010
Filing Date:
November 03, 2004
Export Citation:
Assignee:
Undermotion Technologies Limited Liability Company
International Classes:
G01D5/24; G01D5/241; G01L1/12; G01L1/20; G01L3/02
Domestic Patent References:
| JP2001517314A | ||||
| JP11304411A | ||||
| JP755500A |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Koichi Itsubo
Kurachi Yasuyuki
Jun Tsuruta
Tetsuro Shimada
Koichi Itsubo
Kurachi Yasuyuki