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Magnetic disk drive and soldering method of feed-through

A technology for disk drives and magnetic disks, used in instruments, poor vibration/sound insulation/absorption, sealing gaskets, etc., can solve problems such as poor sealing ability, large diffusion coefficient, and small helium gas, and achieve improved leakage service life, reliable Solder bonding, the effect of preventing deterioration

Inactive Publication Date: 2008-10-22
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since helium gas has a very small molecular size and has a large diffusion coefficient, casings used for general magnetic disk drives inevitably have the problem that helium gas easily leaks due to poor sealing ability, resulting in Difficulty maintaining drive performance

Method used

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  • Magnetic disk drive and soldering method of feed-through
  • Magnetic disk drive and soldering method of feed-through
  • Magnetic disk drive and soldering method of feed-through

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] refer to figure 1 and figure 2 to describe the structure of the base. figure 1 A cross-sectional view of the joint portion between the base and the lead is shown. figure 2 The relationship between the periphery of the opening showing the base, the leads, and the solder prior to bonding is shown. An opening 20 for mounting the lead wire 30 is provided at the bottom of the base 10 , and a stepped portion 22 is provided inside the periphery forming the opening 20 . The stepped portion 22 is composed of three-level stepped surfaces, wherein a stepped surface 24 facing the opening 20 has an edge opposite to the opening 20, and a flange 32 of the lead wire 30 is placed on the stepped surface 24, and has The ramp 26 extends to the outside of the base 10 .

[0056] Next, refer to Figures 1 to 4 A description will be made of a process of manufacturing a hermetically sealed magnetic disk drive in which the base 10 is bonded to the leads 30 by welding to seal the low-den...

Embodiment 2

[0072] Figure 6 A cross-section of the joint portion between the base and the leads of the sealed magnetic disk drive according to Embodiment 2 is shown. The base 10 corresponds to the 90° product base in Embodiment 1. Leads 30 include as Figure 6(a) A lead shown in which a bump 35 having a width of 0.2 mm and a height of 0.3 mm is formed on the surface edge of the flange portion not requiring solder wetting, and includes such as Figure 6 (b) A lead shown in which a groove 36 having a width of 0.2 mm and a depth of 0.3 mm is formed on its edge.

[0073] As in Embodiment 1, two solder pressing pieces 40 are used, each of which is composed of Sn-3Ag-0.5Cu (mass percentage), has a width of 1.0 mm and a thickness of 1.0 mm, and is elliptical shape. According to the same procedure as in Embodiment 1, the base 10 and the lead 30 were bonded by soldering. Then, as in Embodiment 1, the components of the disk drive are mounted on the base 10, and then the base and the seal are ...

Embodiment 3

[0079] Figure 7 A section of a joint portion between a base and leads of a sealed magnetic disk drive according to Embodiment 3 is shown. The base 10 corresponds to the 90° product base in Embodiment 1. In the leads 30 , portions that do not require solder wetting are covered with a solder resist 37 , or a masking tape 38 is attached.

[0080] As in Embodiment 1, two solder pressing pieces 40 are used, each of which is composed of Sn-3Ag-0.5Cu (mass percentage), has a width of 1.0 mm and a thickness of 1.0 mm, and is elliptical shape. According to the same procedure as in Embodiment 1, the base 10 and the lead 30 were bonded by soldering. Then, as in Embodiment 1, the components of the disk drive are mounted on the base 10, and then the base and the seal are joined, so that the low-density gas is sealed in the housing.

[0081] In order to evaluate the lifetime of the low density gas seal for each sealed disk drive, a temperature cycling test as in Example 1 was performed...

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Abstract

The invention provides a solder connecting structure with high reliability, characterized in that, even if the flange of lead wire of sealed disk driver is made of kovar that is an iron-based material, the low density gas may almost not leak out; and a base of the driver is made of aluminium-based alloy. The base 10 has a step-shaped portion 22 located inside the periphery of an opening 20; a bevel 26 extending out of the base 10 is formed at the edge of a surface 24 of the step-shaped portion; a flange 32 of the lead wire 30 is placed on the bevel 26; therefore, a round corner of the solder 42 is not only formed inside of the base 10, but also formed outside of the same, when the step-shaped portion 22 of base is connected with the flange 32 of lead wire by welding.

Description

technical field [0001] The present invention relates to disk drives, and more particularly, to hermetically sealed disk drives adapted to seal a low density gas, such as helium, inside the drive. Background technique [0002] In recent magnetic disk drives, a magnetic disk is rotated at a high speed and a head suspension assembly is driven at a high speed in order to satisfy demands for large capacity and high recording density. Therefore, there is a high possibility that air turbulence (wind turbulence) causes vibration of the magnetic disk or the head suspension assembly. Wind turbulent vibrations can significantly hinder the positioning of the magnetic head on the track of a magnetic disk undergoing high-density recording. The reason is that since wind turbulence is caused by air turbulence, which occurs randomly, the magnitude or period of wind turbulence is almost impossible to predict, and therefore when trying to control the positioning of the head quickly and accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B33/14
CPCG11B33/1466G11B33/08G11B33/122G11B33/148
Inventor 中塚哲也青柳彰彦中宫光裕河野敬进藤仁
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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