Position detecting device for detecting the absolute value of a position of a movable member which has a sensor mounted thereon
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United States of America Patent
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Oct 13, 2009
Grant Date -
Oct 2, 2008
app pub date -
Feb 5, 2008
filing date -
Mar 26, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A position detecting devices includes a scale, a sensor, and a control section. The scale has a plurality of light emitting elements located at spacings along a direction in which a movable member is moved. Mounted on the member, the sensor detects light from at least one of the elements within a predetermined detection range longer than a largest one of the spacings, and outputs a light reception signal according to a position where the light is received within the range. Upon receipt of the signal, the control section retrieves from the storage section information on a located position of one of the light emitting elements that is being driven, and calculates a position of the member based on the retrieved information and the received signal.
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