Position detector and a detected element having a pattern for generating a position signal formed thereon
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United States of America Patent
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May 31, 2011
Grant Date -
Sep 25, 2008
app pub date -
Sep 16, 2004
filing date -
Mar 22, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
As shown in FIG. 1, a position detector (10) includes: an object to be detected having a pattern (2) formed for generating a position signal; and a sensor (3) for detecting the position signal according to the pattern (2) by receiving an electromagnetic wave generated on the object (1) by light irradiation. The pattern (2) is formed in a gradation shape visibly or invisibly so that an electromagnetic wave having a wavelength continuously different depending on the position on the object (1) can be sent to the sensor (3). This enables detection of an absolute angle of a rotary object and an absolute position on an XY plane with a simpler configuration, simplifies the device assembly, and reduces the device size.
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