Glass Substrate for Information Recording Medium and Method for Producing the Same
a technology of information recording medium and glass substrate, which is applied in the direction of manufacturing tools, lapping machines, abrasive surface conditioning devices, etc., can solve the problems of troublesome tasks and requiring a long period of time increas
Inactive Publication Date: 2008-09-11
HOYA CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, as the steps related to polishing become divided into many steps, tasks that are troublesome and that require a long period of time increase.
Method used
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Examples
Experimental program
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Effect test
example 1
[0067]The pad dressing process was performed on a sponge-like hard polisher made of polyurethane using the pad dresser 11 shown in FIG. 2, and the first polishing process was performed on a raw material glass plate with this hard polisher. In the first polishing process, the raw material glass plate was roughly polished by performing pre-polishing for 30 minutes under a load of 150 g / cm2 and then performing post-polishing for a predetermined time under a load of 40 g / cm2. The raw material glass plate was used as the sample for example 1. The mesh size of the pad dresser 11 was #600, and the size of the circular plate 12 was the same size as the raw material glass plate in which the thickness was 0.6 mm, the outer diameter was 65 mm, and the inner diameter was 20 mm.
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Abstract
A glass substrate for an information recording medium is manufactured by polishing the surface of a raw material glass plate. The polishing of the raw material glass plate is divided into a step for performing a first polishing process to roughly polish the surface of the raw material glass plate to be smooth and a step for performing a second polishing process to finely polish the surface of the roughly polished raw material glass plate to be smoother. The first polishing process uses a polishing pad made of a synthetic resin foam and slides the polishing pad on the raw material glass plate surface while supplying a polishing agent to roughly polish the surface. A pad dressing process is performed on the polishing pad before being used in the first polishing process. The pad dressing process polishes the surface of the polishing pad by sliding the polishing pad on a pad dresser including abrasive grains.
Description
TECHNICAL FIELD[0001]The present invention relates to a glass substrate for an information recording medium used in a magnetic disc, which is a magnetic recording medium for an information recording device such as a hard disc, a magneto-optical disc, and an optical disc or the like, and a method for manufacturing the same.BACKGROUND ART[0002]Conventionally, a glass substrate for an information recording medium must have a surface that is as smooth as possible to enable recording of information with high density. Thus, the surface of the glass substrate is ground and polished in plural stages during manufacturing to suppress the formation of microscopic protuberances (refer to, for example, Japanese Laid-Open Patent Publication No. 11-154325). That is, the glass substrate is ground and polished in steps divided into rough grinding, fine grinding, first polishing, and second polishing (final polishing).[0003]The first polishing is a step using a polishing device to polish the surface ...
Claims
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IPC IPC(8): B24B41/06B24B53/007B24B53/017B24B53/02C03C19/00G11B5/73G11B5/84
CPCB24B37/042G11B5/8404B24B53/017
Inventor MINAMI, AKIHIDESUZUKI, KOICHIHORISAKA, TAMAKI
Owner HOYA CORP