Method of manufacturing a circular optical storage disc and circular optical storage disc

Number of patents in Portfolio can not be more than 2000

United States of America Patent

APP PUB NO 20010018093A1
SERIAL NO

09773131

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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In the method of manufacturing a circular optical storage disc (10), an extension body (21) is present around the substrate (11) of the optical disc (10) during the spin coating of cover or spacer layers (15). The extension body (21) may consist of one or several pieces. The outer periphery (23) has a circular or polygonal shape. The inner periphery of the extension body is in close circumferential contact with the periphery (13) of the optical disc substrate (11). The surface (22) of the extension body is substantially flush with the surface (12) of the substrate (11) of the optical disc in order not to impede the flow of spin coating liquid during spin coating. The raised edge (16), which usually forms at the periphery (13) of the substrate (11) is now transferred to the outer periphery (23) of the extension body (21). After the coating operation the extension body (21) is removed. By choosing a surface (22) to which the coating (15) adheres poorly, reuse of the extension body (21) is facilitated. The manufactured optical storage disc (10) has no or a very small raised edge (16), and the method causes no extra birefringence.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
KONINKLIJKE PHILIPS ELECTRONICS N.V.EINDHOVEN, NL4300

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Decre, Michel Marcel Jose Eindhoven, NL 32 462

Cited Art Landscape

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
* 5294257 Edge masking spin tool 46 1991
 
SHARP KABUSHIKI KAISHA (1)
* 5250116 Resist film coating apparatus 19 1992
 
SONY CORPORATION (2)
* 6349086 Optical disc and method for manufacturing same 8 1999
* 6613396 Optical disc and method for manufacturing same 7 2000
 
FAS HOLDINGS GROUP, LLC (1)
* 6495205 Linear extrusion coating system and method 4 1998
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
PIONEER CORPORATION (1)
* 2002/0071,909 Film forming apparatus and film forming method 1 2001
 
ORIGIN ELECTRIC COMPANY, LIMITED (4)
7267790 Method and apparatus for treating a disc substrate 0 2002
* 2003/0102,582 Method and apparatus for treating a disc substrate 1 2002
7168940 Method and apparatus for treating a disc substrate 0 2005
* 2005/0129,804 Method and apparatus for treating a disc substrate 0 2005
 
TDK CORPORATION (2)
* 6844045 Method for making optical information medium and optical information medium 2 2003
* 2004/0096,618 Method for making optical information medium and optical information medium 1 2003
 
FUJI PHOTO FILM CO., LTD. (1)
* 2005/0122,892 Optical information recording medium, manufacturing method of optical information recording medium, and optical information recording method 1 2004
 
SAMSUNG ELECTRONICS CO., LTD. (2)
* 7147893 Method of and apparatus for forming transparent layer on disc substrate, and disc therefrom 0 2002
* 2003/0039,797 Method of and apparatus for forming transparent layer on disc substrate, and disc therefrom 0 2002
 
PHOTON DYNAMICS, INC. (3)
* 6866887 Method for manufacturing PDLC-based electro-optic modulator using spin coating 6 2003
7639319 Polymer dispersed liquid crystal formulations for modulator fabrication 1 2005
8801964 Encapsulated polymer network liquid crystal material, device and applications 0 2010
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
* 7101588 Apparatus and method for applying liquid material to form a resin layer 0 2002
* Cited By Examiner