Encoder having long length measuring stroke
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United States of America Patent
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Mar 12, 1991
Grant Date -
N/A
app pub date -
May 3, 1989
filing date -
May 10, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An encoder having a long length measuring stroke with a simple construction is provided. The encoder comprises a scale formed with a periodic lattice pattern, first and second reading heads arranged along a moving direction of the scale for reading the scale, and an adder for adding output signals from the first and second reading heads. The encoder further has adjusting mechanism for adjusting such that the phase difference between the output signals from the first and second reading head becomes zero. A continuous periodic signal can be always accurately obtained independently of the position of the scale.
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