Position detection encoder having plural light receiving and light emitting elements
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United States of America Patent
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Jun 30, 1992
Grant Date -
N/A
app pub date -
Oct 25, 1990
filing date -
Oct 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A position detection encoder includes a code plate having a plurality of slots formed therein, a first light emitting element and a first light receiving element disposed on one side of the code plate, and a second light emitting element and a second light receiving element disposed on another side of the code plate. A first light beam emitted from the first light emitting element and received by the second light receiving element passes simultaneously through a same one of the plurality of slits of the code plate as does a second light beam emitted from the second light emitting element and received by the first light emitting element. Detection signals having differing phases are respectively obtained from the first and second light receiving elements.
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