Flexure, head gimbal assembly and disk drive unit with the same, and manufacturing method thereof

Abstract

A flexure for a suspension of a head gimbal assembly includes a substrate layer, a dielectric layer formed thereon, a conducting layer formed on the dielectric layer, and an insulating cover layer covered on the conducting layer, wherein at least one window is configured at a surface of the insulating cover layer thereby a portion of the conducting layer is exposed, and an antistatic adhesive is adhered to at least one side wall of the window and contacted with the conducting layer. The new structure of the flexure can avoid or eliminate electro-static discharges enduringly without dipping water. A head gimbal assembly and a disk drive unit with the same, a manufacturing method for the flexure are also disclosed.

Description

FIELD OF THE INVENTION[0001]The present invention relates in general to information recording disk drive, and more particularly to a flexure, a head gimbal assembly (HGA) and a disk drive unit with the same, and a manufacturing method of a flexure.BACKGROUND OF THE INVENTION[0002]Electro-static charge is an undesired event and a major problem during the production of electronic components. Electro-static discharge (ESD) is vital to the manufacture of electronic components that are sensitive to static electricity, such as hard disk drives (HDD), semiconductors and electronic assemblies packaging. ESD may bring shorting-circuit, opening-circuit, loss of function, or disqualification of parameter to the electronic components, and thereby resulting in losing operational capability or performance reduction of them. ESD is regarded as the biggest potential killer to the quality of the electronic components, thus electro-static protection becomes a key content of controlling the quality of...

AI Technical Summary

Benefits of technology

The present invention relates to a flexure, a manufacturing method for it, a head gimbal assembly with it, and a disk drive unit with it. The invention aims to prevent or eliminate ESD (electro-static discharge) without dipping water. The solution involves configuring a window on the insulating cover layer and adding an antistatic adhesive to the window and the conducting layer to ground the conducting layer and prevent or reduce the generation of electro-static charges on the flexure. This adhesive can take effect enduringly without dipping water and any corrosion.

Problems solved by technology

Electro-static charge is an undesired event and a major problem during the production of electronic components.

ESD may bring shorting-circuit, opening-circuit, loss of function, or disqualification of parameter to the electronic components, and thereby resulting in losing operational capability or performance reduction of them.

PI material as a plastic is a good electrical insulator, tending to acquire a strong electro-static charge which may result in ESD and cause damage and malfunction in the manufacturing or operational process of the flexure 20′.

However, the dipping water has some disadvantages.

First, ultra-pure water used in the process of dipping water has high resistivity and is unstable for duration, the flexure may again generate static charges and damage itself Second, water is easy to breed bacteria, harmful to the health of employees or consumers.

Third, water may erode the components, which reduces the lifetime of the flexure.

In addition, the method of dipping water for preventing ESD takes effect only in the manufacturing process, but can not work in the operational process when the flexure has been mounted on the HDD.

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