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1. WO1998017434 - FLAT GLASS DISKS

Publication Number WO/1998/017434
Publication Date 30.04.1998
International Application No. PCT/IB1997/001324
International Filing Date 22.10.1997
IPC
B23K 26/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
B23K 26/40 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
36Removing material
40taking account of the properties of the material involved
C03B 33/04 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
BMANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
33Severing cooled glass
02Cutting or splitting sheet glass; Apparatus or machines therefor
04Cutting or splitting in curves, especially for making spectacle lenses
G11B 5/73 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
73Base layers
G11B 5/82 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
74Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
82Disk carriers
G11B 23/00 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
23Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus
CPC
C03B 33/04
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
33Severing cooled glass
02Cutting or splitting sheet glass ; or ribbons; Apparatus or machines therefor
04Cutting or splitting in curves, especially for making spectacle lenses
G11B 23/0021
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
23Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
0014record carriers not specifically of filamentary or web form
0021discs
G11B 23/0064
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
23Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
0057Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure
0064mediums or carriers characterised by the selection of the material
G11B 5/7315
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
73Base layers ; , i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
731without bonding agent in the material
7315substrates
G11B 5/82
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
74Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
82Disk carriers
Applicants
  • PTG PRÄZISIONSTECHNOLOGIE GMBH [DE]/[DE] (AllExceptUS)
  • KONDRATENKO, Vladimir Stepanovitch [BY]/[AT] (UsOnly)
  • NIKITIN, Dmitry Gennadyevich [RU]/[AT] (UsOnly)
Inventors
  • KONDRATENKO, Vladimir Stepanovitch
  • NIKITIN, Dmitry Gennadyevich
Agents
  • GALLAFENT, Richard, John
Priority Data
9621989.422.10.1996GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FLAT GLASS DISKS
(FR) DISQUES DE VERRE PLATS
Abstract
(EN)
The performance of data storage devices based on flat glass disks (hard drives) may be materially improved by ensuring flatness of the annular disk over its entire flat surface area. In accordance with the invention, the flatness of the disk faces may extend right up to their edges by grinding and/or polishing flat an oversize blank after the outer edge of the final disk has been defined in the blank by way of a laser-induced blind crack. After grinding and polishing, the portion of the blank outside the desired final edge is split off.
(FR)
On peut améliorer matériellement les performances de dispositifs de stockage de données sous forme de disques de verre plats (unités de disques durs), en assurant la planéité du disque annulaire sur toute sa surface plane. Selon cette invention, on parvient à étendre la planéité des faces du disque jusqu'à leurs bords, en aplanissant par meulage et/ou polissage une ébauche de taille plus grande, après avoir défini le bord extérieur du disque final dans l'ébauche au moyen d'une rainure non traversante produite par laser. Après meulage et polissage, on rompt la partie de l'ébauche se trouvant à l'extérieur du bord final désiré.
Also published as
Latest bibliographic data on file with the International Bureau