Search position encoder
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United States of America Patent
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Oct 26, 1993
Issued Date -
N/A
app pub date -
Feb 20, 1990
filing date -
May 26, 1988
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Abstract
The search position encoder includes a generally planar medium, a search probe and a device for moving the probe generally parallel to the surface of the planar medium, and indexing device for locating the actual position of the probe relative to a fixed location on the generally planar medium. A plurality of gratings consisting of alternating strips of conducting and non-conducting materials are arranged on or adjacent to the medium parallel to orthogonal axes of the medium, and a device for sensing the movement of the probe in a plane parallel to the gratings. The location of the probe may then be determined based upon the sensing of the passage of the probe relative to the gratings.
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