Planar inductor
Patent 4959631 Issued on September 25, 1990. Estimated Expiration Date: 
September 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3833872 Resonant tag circuits having one or more fusible links Planar inductors Planar coil magnetic transducer Patent #: 4613843 InventorsApplicationNo. 250401 filed on 09/28/1988US Classes:336/83, CORE FORMS CASING336/180, WINDING FORMED OF PLURAL COILS (SERIES OR PARALLEL)336/200, Printed circuit-type coil336/232, Planar type336/234Laminated type (includes bundles of rods or wires)ExaminersPrimary: Kozma, Thomas J.Attorney, Agent or FirmForeign Patent References
International ClassesH01F 015/02H01F 027/30 Foreign Application Priority Data1987-09-29 JPAbstractDisclosed is a planar inductor which has spiral conductor coil means sandwiched between ferromagnetic layers with insulating layers interposed therebetween. The spiral conductor coil means is formed of two spiral conductor coils of the same shape arranged flush with and close to each other. Moreover, the two spiral conductor coils are connected electrically to each other so that currents of different directions flow individually through the conductor coils. Furthermore, the spiral conductor coil means is sandwiched between the two ferromagnetic layers with the insulating layers therebetween, each of the ferromagnetic layers having an area greater than the combined area of the two conductor coils. In the planar inductor according to the present invention, inductance is prevented from lowering while its components are being bonded together, so that the inductance value per unit volume is increased.Other References
Field of SearchPrinted circuit-type coilPlanar type CORE (E.G., COMPRESSED POWDER) Laminated type (includes bundles of rods or wires) CORE FORMS CASING Flexible filament, strip or sheet insulation WINDING FORMED OF PLURAL COILS (SERIES OR PARALLEL) Wound to reduce external magnetic field (i.e., fieldless winding) PLURAL PART CORE | |
