US Patent Application No: 2001/0018,093

Number of patents in Portfolio can not be more than 2000

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

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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.EINDHOVEN7441

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Decre, Michel Marcel Jose Eindhoven, NL 43 236

Cited Art Landscape

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
* 5,294,257 Edge masking spin tool 46 1991
 
SHARP KABUSHIKI KAISHA (1)
* 5,250,116 Resist film coating apparatus 19 1992
 
SONY CORPORATION (2)
* 6,349,086 Optical disc and method for manufacturing same 8 1999
* 6,613,396 Optical disc and method for manufacturing same 7 2000
 
FAS HOLDINGS GROUP, LLC (1)
* 6,495,205 Linear extrusion coating system and method 4 1998
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
ORIGIN ELECTRIC COMPANY, LIMITED (2)
7,267,790 Method and apparatus for treating a disc substrate 0 2002
7,168,940 Method and apparatus for treating a disc substrate 0 2005
 
TDK CORPORATION (1)
* 6,844,045 Method for making optical information medium and optical information medium 2 2003
 
SAMSUNG ELECTRONICS CO., LTD. (1)
* 7,147,893 Method of and apparatus for forming transparent layer on disc substrate, and disc therefrom 0 2002
 
PHOTON DYNAMICS, INC. (3)
* 6,866,887 Method for manufacturing PDLC-based electro-optic modulator using spin coating 6 2003
7,639,319 Polymer dispersed liquid crystal formulations for modulator fabrication 1 2005
8,801,964 Encapsulated polymer network liquid crystal material, device and applications 0 2010
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
* 7,101,588 Apparatus and method for applying liquid material to form a resin layer 0 2002
* Cited By Examiner