Method and apparatus for reducing the width of marks written in

Details Method and apparatus for reducing the width of marks written in Method and apparatus for reducing the width of marks written in

1997-07-21

1999-11-23

Edun, Muhammad

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 58, 369116, G11B 700

Patent

active

059912529

ABSTRACT:
The present invention includes a method and apparatus for reducing the width of a mark written in optical media. When forming a long mark, the prior art recording methods typically cause blooming at the edges of the mark, resulting in a wide mark pattern which may be sensed by the read focused spot reading an adjacent track causing increased adjacent track crosstalk (ATC). However, by removing every other pulse from the write pulse waveform, the cooling sequence of the writing process is sufficiently increased to allow for additional cooling between pulses. When forming marks with less pulses, the effects of blooming are substantially reduced. Thus, because of the reduction in the effect of blooming, the problems associated with ATC, whereby adjacent track information is recorded, is substantially reduced.

REFERENCES:
patent: 5130971 (1992-07-01), Ohno et al.
patent: 5469422 (1995-11-01), Sohmuta
patent: 5487059 (1996-01-01), Saito et al.

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