Magneto-optical head for information reading

Details Magneto-optical head for information reading Magneto-optical head for information reading

1997-04-23

2000-03-28

Dinh, Tan

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

360114, 360122, G11B 5127

Patent

active

060440457

ABSTRACT:
The invention relates to the devices for reading the information from magnetic carriers of recording, more detailed, to magneto-optical heads for reproducing the information. The technical result is substantiated in higher resolution, increase of ratio of useful signal to noise, simplification of construction and manufacturing process of the head, extending the service life. Magneto-optical head for reproducing of information consists of underlay 2 made of material characterized by high transparency in the spectral range of the source of the reading polarized light, for example, from a mono-crystalline gadolinium-gallium garnet. On the side of the underlay 2, that is turned towards magnetic medium 4 with the stored information, a magneto-optical transducer 3 is placed in form of a ferrite-garnet film, on the free side of which a reflective mirror layer 6 can be deposited. The opposite side of the underlay 2 in the fragments 11 and 12 lying in the propagation way of the reading light beam, the one entering the underlay 2, as well as the one reflected from film 3, is made convex, with a curvature assuring possibility of enlargement of the domain structure image of the ferrite-garnet film 3. Additionally, the curvatures of the convex fragments 11 and 12 may be different.

REFERENCES:
patent: 3594064 (1971-07-01), Bierlein
patent: 3650601 (1972-03-01), Bierlein
patent: 5392181 (1995-02-01), Lhureau et al.

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