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Voice coil actuator

  • US 5,321,762 A
  • Filed: 08/05/1991
  • Issued: 06/14/1994
  • Est. Priority Date: 08/05/1991
  • Status: Expired due to Term
First Claim
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1. A voice coil actuator comprising:

  • a magnetic flux conductive material core having a first surface and a continuous channel disposed in said first surface, said channel having a first wall and a second opposing wall, said second wall including an anti-fringing groove,a cylindrical magnet disposed in intimate contact with said first wall and spaced from said second wall, so that a gap remains between said magnet and said second wall, said magnet having a first face of a first magnetic polarity facing said first wall and a second face of a second, opposite magnetic polarity facing said gap, said magnet further being spaced from a bottom of said channel so that magnetic flux is substantially normal from said second face across said gap to said second wall; and

    an electrical current conductive coil moveably suspended in said gap such that an electrical current in said coil develops a magnetic force on said coil in a direction substantially normal to said magnetic flux to displace said coil in response to said magnetic force, said coil having a length less than a height of said gap such that said coil remains fully within said gap when displaced within the range of the total stroke of said coil.

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