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Position detecting apparatus

  • US 6,070,132 A
  • Filed: 10/28/1997
  • Issued: 05/30/2000
  • Est. Priority Date: 10/28/1996
  • Status: Expired due to Fees
First Claim
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1. A position detecting apparatus comprising:

  • a single scale having graduation lines marked at predetermined pitches;

    a sensor displaceable with respect to said single scale and detecting periodic signals indicative of cycles corresponding to the pitches of the graduation lines; and

    a plurality of interpolating means for interpolating the periodic signals, the plurality of interpolation means including a first interpolation means for outputting a first integer number of first interpolation signals, and a second interpolation means for outputting a second integer number of second interpolation signals, the first interpolation signals differing in phase from each other by a first predetermined angle, the second interpolation signals differing in phase from each other by a second predetermined angle.

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