Ultra compact scanning system for a wide range of speeds, angles and field depth

  • US 5,596,446 A
  • Filed: 10/31/1994
  • Issued: 01/21/1997
  • Est. Priority Date: 11/15/1990
  • Status: Expired due to Term
First Claim
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1. A light beam scanning system for scanning a target to read information therefrom, said system comprising a scan element for receiving a light beam and directing it toward a target as a scanning beam with an angular oscillatory movement of said beam about a neutral axis, said scan element comprising:

  • a coil for carrying electric current, said coil having a coil axis and an opening along said coil axis;

    a shaft having a shaft axis disposed substantially perpendicular to said coil axis;

    a magnetic element mounted for rotation about said shaft axis in response to current in said coil and producing a magnetic field oriented generally perpendicular to said shaft axis;

    a first beam-directing optical element which is coupled to said magnetic element for rotation therewith about said shaft axis; and

    a ferromagnetic circuit including at least one ferromagnetic element disposed with respect to said magnetic element so as to establish a minimum energy rotational orientation of said magnetic element in which said magnetic field of said magnetic element is oriented generally perpendicular to said coil axis.

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