Distance or position detecting device
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Sep 3, 1991
filing date -
Sep 3, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A distance or position detecting device has a movable member forming a measuring ruler and a detector in the form of a primary coil and a plurality of secondary coils forming together a stationary member. The measuring ruler is movable coaxially inside a hollow core of the primary coil. The measuring ruler is made of a plurality of sections alternating with one another along the length of the ruler, whereby these sections have different discernible characteristics, for example, magnetic characteristics and nonmagnetic characteristics. The individual ruler sections are assembled along the length of the ruler in such a manner that a respective limited number of neighboring ruler sections are arranged in an encoded form so that the encoding provides an absolute position indication. Such a structure is simple and hence cost effective in any of its operational states. An accurate and absolute position indication is thus possible.
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