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Surveying instrument incorporating a magnetic incremental rotary encoder

  • US 6,629,371 B1
  • Filed: 10/20/2000
  • Issued: 10/07/2003
  • Est. Priority Date: 10/22/1999
  • Status: Expired due to Fees
First Claim
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1. A surveying instrument which incorporates a magnetic incremental rotary encoder, comprising:

  • a rotary magnetic drum having, on an outer peripheral surface, a multi-pole magnetized layer having a plurality of equally-divided magnetized divisions;

    at least one magnetic sensor located so as to face said multi-pole magnetized layer; and

    at least one magnet, positioned in the vicinity of said at least one magnetic sensor, said at least one magnet being configured to reduce an error in detection of said magnetic incremental rotary encoder;

    wherein said at least one magnet is configured and positioned so that primary lines of magnetic force develop substantially parallel to a sensor surface of a corresponding magnetic sensor, and substantially orthogonal to lines of a magnetic field of said multi-pole magnetized layer.

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