Optical pickup for optical magnetic disc

Details Optical pickup for optical magnetic disc Optical pickup for optical magnetic disc

1995-11-13

1996-12-24

Tran, Thang V.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 4414, 369 4437, G11B 700

Patent

active

055879764

ABSTRACT:
An optical pickup for an optical magnetic disc includes a light source, a grating for diffracting the light into a main light beam and auxiliary light beams, a plurality of magnetic dipole tips arranged above the optical magnetic disc so as to interact with the magnetic signal stored in the optical magnetic disc. Also, a plurality of mirror members each attached to the rear of each magnetic dipole tips are for reflecting the light incident on the mirror member, and a photodetector for detecting track errors and the stored information by receiving the light reflected from the mirror members are provided, thereby detecting the error signal and reproducing information by the interaction with the magnetic dipoles of the disc so that the recording density can be increased without increasing the conventional land and groove areas in the disc.

REFERENCES:
patent: 5151887 (1992-09-01), Miyazaki
patent: 5276672 (1994-01-01), Miyazaki et al.
patent: 5461605 (1995-10-01), Takimoto et al.
patent: 5537372 (1996-07-01), Albrecht et al.

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