Device for optical reading and magnetic writing on a data carrie

Details Device for optical reading and magnetic writing on a data carrie Device for optical reading and magnetic writing on a data carrie

1988-10-04

1991-09-17

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 369110, G11B 1110, G11B 1304

Patent

active

050501437

ABSTRACT:
An optical reading and magnetic writing device for data on a magnetooptic recording carrier including a writing transducer (TRI) of data on the carrier disposed on a flying head (PATI), a light source (SLI) emitting a beam of polarized incident light (F.sub.i) onto the surface of the carrier, a holographic lens (LHI) for focusing the incident beam (F.sub.i) onto the surface of the carrier, affixed to the head, a separator element (ESI) separating the incident beam from the reflected beam, and a detector (MDKI) for detecting the angle of rotation of the plane of polarization of the light. According to the invention, the optical reading and magnetic writing device is characterized in that the light source (FLI) is disposed and fixed on the head (PATI). The invention is applicable to magnetooptic disk memories.

REFERENCES:
patent: 4029944 (1977-06-01), Trenhamp
patent: 4893207 (1989-01-01), Maury et al.
Patent Abstracts of Japan, vol. 7, No. 245 (P-233)(1390), Oct. 29, 1983; & JP-A-58 130 458 (Sharp K.K.) 03-08-1983.
Patent Abstracts of Japan, vol. 10, No. 143 (P-459)(2200), May 27, 1986; & JP-A-60 261 052 (Fujitsu K.K.) 24-12-1985.
Patent Abstracts of Japan, vol. 8, No. 211 (P-303)(1648), Sep. 26, 1984; & JP-A-59 94 257 (Olympus Kogaku Kogyo K.K.) 30-05-1984.

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