Apparatus for generating magnetic field varying in response to a

Details Apparatus for generating magnetic field varying in response to a Apparatus for generating magnetic field varying in response to a

1991-02-05

1992-05-05

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 13, 369 14, 360 59, 360 60, 360 66, 360114, G11B 1100, G11B 1300, G11B 502, G11B 1504

Patent

active

051114410

ABSTRACT:
An apparatus for generating a magnetic field varying in response to an information signal, which comprises a base plate made of electrical insulating material, a magnetic core mounted on one of opposite surfaces of the base plate, the magnetic core having a central leg portion extending through a hole formed in the base plate so as to cause its end face to appear on the other of the opposite surfaces of the base plate, a coil member wound on the central leg portion of the magnetic core to be supplied with a current varying in response to the information signal, and a capacitance detecting electrode formed with a thin conductive layer mounted on the other of the opposite surfaces of the base plate to be opposite to a recording medium having a conductive layer, the capacitance detecting electrode being provided with a cutout for restraining eddy current loss caused in the capacitance detecting electrode.

REFERENCES:
patent: 4639906 (1987-01-01), Goto
patent: 4837758 (1989-06-01), Motoyama et al.
patent: 4843600 (1989-06-01), Miyajima et al.

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