Position encoder using a laser scan beam
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United States of America Patent
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Mar 22, 1988
Grant Date -
N/A
app pub date -
Feb 14, 1986
filing date -
Feb 14, 1986
priority date (Note) -
Expired
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Abstract
Known absolute type position encoders have poor resolution due to bits density of tracks formed on an encoding member and mechanical size of sensors opposed to the encoding member for reading absolute position data from the tracks. This invention provides a position encoder comprising a laser scanning type encoding member on which data tracks aligned at equal intervals in a moving direction of a part to be position-measured. A sensor with a single laser beam deflectable along the track is used for reading the position data. High resolution is obtained since it depends upon recorded pitch of tracks. Many data can be recorded on each track, including error correction code for the position code. It improves reliability of the encoder.
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