G - Physics – 01 – D
Patent
G - Physics
01
D
234/37, 352/29.0
G01D 15/12 (2006.01) G03G 19/00 (2006.01)
Patent
CA 1189969
DIFFERENTIAL-PERMEABILITY FIELD-CONCENTRATING MAGNETIC WRITING HEAD Abstract of the Disclosure A magnetic-image writing head including inner and outer, substantially co-planar, symmetrically arranged pole portions. In one embodiment, the head is disclosed with the inner pole portion presentinq a substantially full-circular facial expanse, and with the outer pole portion presenting an annular facial expanse surrounding that of the inner pole portion. In another embodiment, each of the two pole portions presents a substantially annular facial expanse. In both embodiments, the inner pole portion has a magnetic permeability which is significantly lower than that of the outer pole portion. An image unit written on a magnetic-image-storage medium by the head takes the form, qenerally, of a dot characterized by an appreciably larger magnetic field intensity adjacent its perimeter than inside the perimeter.
408436
Ferix Corporation
Fetherstonhaugh & Co.
LandOfFree
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