Glass substrate for magnetic recording medium, and magnetic recording medium using the glass substrate for magnetic recording medium

A technology for magnetic recording media and glass substrates, which is used in magnetic recording, data recording, recorded information storage, etc., and can solve the problems of insufficient prevention of magnetic head collision, insufficient suppression of flutter displacement, and deterioration of magnetic head floating stability. The effect of preventing head collision, improving reliability, and high reliability

Active Publication Date: 2016-04-27
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the magnetic disks described in Patent Document 1 and Patent Document 2, the deformation of the shape of the magnetic disk mounted on the HDD and the resulting flutter displacement cannot be sufficiently suppressed, so the floating stability of the magnetic head deteriorates and cannot be sufficiently suppressed. Prevent head collision, etc.
In addition, conventional magnetic disks do not have sufficient impact resistance when shocks are applied to the magnetic disk device due to dropping or the like.

Method used

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  • Glass substrate for magnetic recording medium, and magnetic recording medium using the glass substrate for magnetic recording medium
  • Glass substrate for magnetic recording medium, and magnetic recording medium using the glass substrate for magnetic recording medium
  • Glass substrate for magnetic recording medium, and magnetic recording medium using the glass substrate for magnetic recording medium

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Embodiment

[0065] Hereinafter, examples of the present invention will be specifically described, but the present invention is not limited to the examples. In Examples 1 to 13 below, Examples 1 to 8 are examples of the present invention, and Examples 9 to 13 are comparative examples.

example 1～13

[0067] Each process shown below was performed sequentially, and the glass substrate for magnetic recording media was manufactured.

[0068] (circular processing)

[0069]The original glass plate was processed into a disc shape with a hole in the center in such a way that a glass substrate for magnetic recording media with an outer diameter of 65 mm, an inner diameter of 20 mm, and a plate thickness of 0.635 mm was obtained. The glass original plate was formed by a float process. of SiO 2 The original glass plate as the main component.

[0070] (chamfering process)

[0071] The intersection of the inner peripheral side and the upper and lower main planes, and the intersection of the outer peripheral side and the upper and lower main planes of the glass substrate processed into a disc shape with a circular hole in the center to finally obtain a chamfer width of 0.15mm, A magnetic recording medium with a chamfering angle of 45° is chamfered in the form of a glass substrate.

...

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Abstract

The invention provides a glass substrate used for magnetic recording media which suppresses shimmy displacement of the magnetic recording media of a magnetic disc device, and improves impact-resistance. The glass substrate used for magnetic recording media of the invention is a round disk-shaped glass substrate used for magnetic recording media, has a though round hole in the center part and a pair of main planes positioned oppositely. The main plane is characterized by comprising a clamp region of a part secured by a connect element when the magnetic recording media is fixed on a hard-disk drive, wherein the clamp region has a flatness of smaller than 1 [mu]m, and the thickness of plating of the clamp region is small than 0.3 [mu]m.

Description

technical field [0001] The present invention relates to a glass substrate for a magnetic recording medium and a magnetic recording medium. Background technique [0002] In recent years, high-density recording has rapidly progressed in magnetic disk devices. In a magnetic disk device, high-density recording and high-speed access are realized simultaneously by slightly floating and scanning a magnetic head on a magnetic recording medium (magnetic disk) rotating at high speed. At present, the mainstream base material of the magnetic disk is a substrate coated with nickel-phosphorus (Ni-P) on aluminum (Al), but it is harder than an aluminum alloy substrate and has excellent resistance to the impact of the magnetic head and flatness. Glass substrate with excellent properties and smoothness. [0003] In the magnetic disk device, the floating amount of the magnetic head tends to be further reduced in order to increase the recording density. However, along with this, there is an i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/66
Inventor 大塚晴彦
Owner ASAHI GLASS CO LTD
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