Thin, Planar shaped carrier with wiegand wires

Details Thin, Planar shaped carrier with wiegand wires Thin, Planar shaped carrier with wiegand wires

1989-06-15

1990-10-23

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record medium

235440, 365133, G11B 574

Patent

active

049656899

ABSTRACT:
A reader for a disk-shaped carrier with Wiegand wires is described which manages with only two permanent magnets (1, 2). the variation of the magnetic field needed for detecting the Wiegand wires is effected by flux concentrating pieces (3, 4, 7) attached to the permanent magnets (1, 2). In order to be able to read the carrier with the Wiegand wires without change when it is inserted into the reader rotated by 180.degree. round its longitudinal axis coinciding with the direction of insertion (14), the flux concentrating pieces (3, 4, 7) are arranged symmetrically with respect to the longitudinal axis (14) which is a two-fold axis of symmetry. To pick-up the Wiegand pulses, two E-shaped soft magnetic cores (9) are provided which carry on their center leg an electrical sensor winding (17). The free ends of the legs of the E-shaped cores (9) face one another and are also arranged symmetrically with respect to the longitudinal axis (14).

REFERENCES:
patent: 4242789 (1981-01-01), Fox
patent: 4408122 (1983-10-01), Casden
patent: 4593209 (1986-06-01), Sloan

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