Optical pickup apparatus and magneto-optical reproducing system

Details Optical pickup apparatus and magneto-optical reproducing system Optical pickup apparatus and magneto-optical reproducing system

1994-06-13

1995-02-28

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304

Patent

active

053943813

ABSTRACT:
An optical pickup apparatus of the present invention for reading out information signals recorded on an optical recording medium such as magneto-optical disc is adapted to split by means of a light splitting element a light beam emitted from a light source into two light beam travelling in different directions, which are linearly polarized in normally intersecting directions and to convert the phases of the vibrational components along normally intersecting two axes on a plane normally intersecting the traveling directions of the two light beams and to irradiate the recording medium with two light beams which are differently polarized so that two beam spots are partially superimposed with each other on the recording medium. The superimposed beam spot area which is a read out area is made smaller than one of the beam spots in size so that a high resolution read-out is performed.

REFERENCES:
patent: 5043960 (1991-08-01), Nakao et al.
patent: 5084851 (1992-01-01), Noda et al.
patent: 5093822 (1992-03-01), Kugiya et al.
Jenkins et al., "Interference of polarized light", Fundamentals of Optics, textbook, third edition, McGraw-Hill Book Company, Inc., 1957, pp. 554-557.

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