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Printed coil unit for small size actuator

  • US 4,658,162 A
  • Filed: 07/23/1985
  • Issued: 04/14/1987
  • Est. Priority Date: 07/23/1984
  • Status: Expired due to Term
First Claim
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1. A printed coil unit for an actuator of a small size comprising at least one printed coil sheet having opposed planar surfaces separated by a defined thickness;

  • a magnet magnetized so as to present at least one magnetic pole in a given plane, said printed coil sheet being disposed in opposition to said magnet and having at least one spiral conductor pattern deposited in said plane,wherein at least one magnetic sensor element having a thickness smaller than said defined thickness of said printed coil sheet, is formed in a region of said printed coil sheet located in the vicinity of and outside of said spiral conductor patterns, said magnetic sensor element being confined within the exposed surfaces of said printed coil sheet.

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