Method and apparatus for high-density reproduction

Details Method and apparatus for high-density reproduction Method and apparatus for high-density reproduction

1994-12-28

1998-01-06

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369120, G11B 700

Patent

active

057062633

ABSTRACT:
A method and apparatus for high-density reproduction of information recorded on an optical disk by increasing the optical resolution during reproduction. The apparatus focuses an optical beam reflected from the optical disk using a lens, and receives the focused reflected optical beam using a photodetector having an optical area whose width is smaller than the diameter of an optical spot formed thereon. As a result, jitter caused by interfering light, that is, light reflected from the circumference such as a recording portion adjacent to the optical disk, can be solved. Also, high-density reproduction can be performed by increasing the optical resolution during reproduction. The apparatus can be applied to an optical pickup for high-density recording.

REFERENCES:
patent: 5144006 (1992-09-01), Kadowaki
patent: 5287338 (1994-02-01), Sato
patent: 5315574 (1994-05-01), Saimi et al.
patent: 5473586 (1995-12-01), Furuhata
"High density recording by superresolution in an optical disk memory system," Yamanaka, et al. Applied Optics, 29:20, 3046-3051, Jul. 10, 1990.

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