Etching a substrate: processes – Forming or treating optical article
Reexamination Certificate
2006-10-10
2006-10-10
Ahmed, Shamim (Department: 1765)
Etching a substrate: processes
Forming or treating optical article
C216S011000, C216S058000, C216S088000, C430S321000, C369S275100, C428S064400, C264S001330, C264S002500
Reexamination Certificate
active
07118681
ABSTRACT:
A method for fabricating an optical disk master including fabricating a precursor formed from a substrate including at least one layer of metallic material and having at least one protuberance or indentation guiding track; preparing the precursor by superposing on the substrate at least one layer of a first material and a second material different from the first material; eroding at least a portion of a surface of one of the materials to only allow to subsist one of the materials at a site of the guiding tracks; depositing on the surface a reactive resin; personalizing the precursor by structuring the reactive surface as a function of information specific to the master to locally eliminate the reactive resin; performing etching zones of the second material at a site of unmasked guiding tracks; and eliminating subsisting deposits of resin and the first material outside of the zones where it is covered by the second material.
REFERENCES:
patent: 5622815 (1997-04-01), Ledieu
patent: 6288998 (2001-09-01), Taira
patent: 6352656 (2002-03-01), Kimura et al.
patent: 198 30 293 (1999-01-01), None
patent: WO 99/18572 (1999-04-01), None
Ahmed Shamim
DLA Piper
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