Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1992-09-23
1994-04-26
Pascal, Robert J.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, 365122, G11B 1100
Patent
active
053073282
ABSTRACT:
A device for writing, reading or erasing a record carrier has a coil with a winding arranged between an objective lens and the record carrier. Optical radiation is focused to a spot, the converging beam passing through the coil opening. A core of a transparent material, having an index of refraction which significantly decreases vergence of the focused beam, is placed in the winding opening. As a result the diameter of the coil can be reduced, and permit increase of the generated magnetic field.
REFERENCES:
patent: 3781905 (1973-12-01), Bernal et al.
patent: 4890178 (1989-12-01), Ichihara
patent: 5124961 (1992-06-01), Yamaguchi et al.
Jacobs Bernardus A. J.
Snijders Wilfred A. M.
Spruit Johannes H. M.
Van Grinsven Petrus A. M.
Neyzari Ali
Pascal Robert J.
Treacy David R.
U.S. Philips Corporation
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