Position detecting device, liquid ejecting apparatus and method of detecting smear of scale
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United States of America Patent
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-
Apr 23, 2013
Grant Date -
Jan 26, 2012
app pub date -
Oct 3, 2011
filing date -
Sep 26, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A position detecting device for detecting a position of an object, includes a light emitting portion that emits light, a light receiving portion that receives the light from the light emitting portion, and a scale that is arranged between the light emitting portion and the light receiving portion, and includes a position detecting pattern and a smear detecting pattern. The position detecting pattern has a first light transmitting portion for transmitting the light from the light emitting portion and a first light interception portion for intercepting the light from the light emitting portion which are alternately arranged in a detection range of the object. The smear detecting pattern for detecting smear of the scale has a second light transmitting portion for transmitting the light from the light emitting portion and a second light interception portion for intercepting the light from the light emitting portion which are alternately arranged.
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