Method and apparatus for correcting position errors using writable encoders
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United States of America Patent
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Aug 21, 1990
Grant Date -
N/A
app pub date -
Jul 13, 1988
filing date -
Jul 13, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for correcting position errors, both linear and rotary is disclosed. In this method a blank encoder is mounted on the system and the position of the part to be controlled is measured. Lines are written on the blank encoder corresponding to equal increments of the position of the controlled part rather than equal increments on the encoder. In this method many of the system positional errors are cancelled. The blank encoder is made of laser recordable material and the writing is achieved by forming a beam of a laser diode into a line. Reading is achieved using the same optical system at a lower power level.
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