US 6,192,017 B1 · Method and apparatus for reducing the width of marks written in optical media

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.

Claims35

Dependent claims

An apparatus for reducing a width of a mark written into an optical media, comprising:

a convertor configured to convert input signals to a first signal pattern having a plurality of pulses;
a processor configured to remove a predetermined amount of said pulses from said first signal pattern thereby forming a second signal pattern having a reduced number of pulses;
a write pulse generator configured to generate a pulse sequence waveform substantially corresponding to said second signal pattern;
a laser diode driver configured to formulate instructions for implementing said pulse sequence waveform;
and,
a laser configured to create a plurality of marks on the optical media in accordance with said instructions.

3 more elements

Dependencies are inferred from the claim text.

Method and apparatus for reducing the width of marks written in optical media

Life of this patent

Method and apparatus for reducing the width of marks written in optical media

Life of this patent

Abstract

Claims35