Global Patent Index - EP 0888612 A1

EP 0888612 A1 19990107 - APPARATUS AND METHODS FOR FORMING AND USE WITH VARIABLE PIT DEPTH OPTICAL RECORDING MEDIA

Title (en)

APPARATUS AND METHODS FOR FORMING AND USE WITH VARIABLE PIT DEPTH OPTICAL RECORDING MEDIA

Title (de)

VORRICHTUNG UND VERFAHREN ZUR HERSTELLUNG UND VERWENDUNG EINES MIT LÖCHERN UNTERSCHIEDLICHEN TIEFEN OPTISCHEN DATENTRÄGERS

Title (fr)

DISPOSITIF ET PROCEDES DE CREATION ET D'UTILISATION D'UN SUPPORT D'ENREGISTREMENT OPTIQUE COMPORTANT DES PUITS A PROFONDEURS VARIABLES

Publication

EP 0888612 A1 19990107 (EN)

Application

EP 97917035 A 19970324

Priority

  • US 9704941 W 19970324
  • US 62019696 A 19960322

Abstract (en)

[origin: WO9735304A1] An apparatus (figure 2) and method for forming a digital optical disc master from a disc having a substrate (300) coated with a photoresist coating (320). The method includes irradiating the surface of the photoresist material (320) with a laser beam (310) at a multiplicity of pit locations over the substrate (300) causing the photoresist material (320) to react to the laser radiation (310) to form at least three different discrete levels at the multiplicity of pit locations relative to the surface of the substrate (300) due to the dose of radiation applied being calculated to react with the photoresist to a depth equivalent to the discrete levels. The exposed photoresist is then developed to achieve the pits having the different discrete levels. A further method is disclosed for equalization and compensation for intersymbol interference between adjacent pits.

IPC 1-7

G11B 7/007; G11B 7/00; G11B 3/70; G11B 20/18

IPC 8 full level

G11B 7/005 (2006.01); G11B 20/10 (2006.01); G11B 20/14 (2006.01); G11B 27/10 (2006.01); G11B 27/30 (2006.01); G11B 27/36 (2006.01)

CPC (source: EP)

G11B 7/0052 (2013.01); G11B 20/10009 (2013.01); G11B 20/1403 (2013.01); G11B 20/1496 (2013.01); G11B 27/10 (2013.01); G11B 27/3027 (2013.01); G11B 27/36 (2013.01)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

WO 9735304 A1 19970925; AU 2549397 A 19971010; AU 707392 B2 19990708; CA 2249403 A1 19970925; CA 2249403 C 20010109; EP 0888612 A1 19990107; EP 0888612 A4 19991229

DOCDB simple family (application)

US 9704941 W 19970324; AU 2549397 A 19970324; CA 2249403 A 19970324; EP 97917035 A 19970324