Scale reading apparatus
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United States of America Patent
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Aug 11, 2009
Grant Date -
Nov 8, 2007
app pub date -
Jul 6, 2005
filing date -
Jul 6, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Scale reading apparatus having a scale and readhead moveable relative to one another. The scale has a first incremental scale pattern with a fine pitch and a second incremental scale pattern with a coarse pitch. The readhead has a detector to detect each of the incremental scale patterns. The scale reading apparatus can be used for both slow speed and fast speed measurements. The second incremental scale pattern may be provided in a scale track which has a dual function (e.g. limit track or reference mark) and the readhead may be configured to decode the signal to produce an output suitable for the desired function.
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