Index track support structure
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United States of America Patent
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-
Oct 1, 1991
Grant Date -
N/A
app pub date -
Mar 30, 1990
filing date -
Mar 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical code track supporting structure for providing position data about a moveable object. The encoder has an outside portion and an inside portion connected by a series of evenly spaced spokes which form a clear index track which allows substantially all of a light beam to be transmitted therethrough. The index track also has a single index element located therein which fully blocks the light beam for one brief pulse during one cycle of the moveable object.
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