Cantilever part, head gimbal assembly and disc driving unit

Abstract

The invention relates to a cantilever part, a head gimbal assembly and a disc driving unit. The invention discloses the cantilever part which comprises a flexible member and a plurality of flexible circuits, wherein the flexible member is provided with a front part and a tail part opposite to the front part; the flexible circuits are formed on the flexible member and extend to the tail part of the flexible member from the front part of the flexible member; each flexible circuit is provided with a multilayer structure; each multilayer structure comprises a lower circuit layer, an upper circuit layer and an insulating layer sandwiched between the lower circuit layer and the upper circuit layer; both each lower circuit layer and each upper circuit layer comprise at least one positive writing circuit and at least one negative writing circuit which are arranged in a staggered way; and each positive writing circuit of each upper circuit layer is over against each negative writing circuit of the corresponding lower circuit layer. In the invention, stronger capacitive coupling can be generated between the positive and negative writing circuits of the upper circuit layers and the lower circuit layers and an electric field is uniformly distributed, so that the signal transmission loss is reduced, and thus, the impedance is reduced and the bandwidth of a frequency is improved.

Description

technical field [0001] The invention relates to an information recording disk drive unit, in particular to a suspension, a head gimbal assembly (HGA) and a disk drive unit. Background technique [0002] A disk drive unit is a common information storage device. Figure 1a is a schematic diagram of a typical disk drive unit 100 . It includes a series of rotatable disks 101 mounted on a spindle motor 102 , and a head stack assembly (HSA) 130 . The HSA 130 includes at least one motor arm 104 and an HGA 150 . Typically, a voice-coil motor (spindling voice-coil motor, VCM) (not shown) is provided to control the movement of the motor arm 104 . [0003] refer to Figure 1b , the HGA 150 includes a magnetic head 103 embedded with a read / write sensor (not shown in the figure) and a suspension member 190 supporting the magnetic head 103 . When the disk drive unit 100 is in operation, the spindle motor 102 rotates the disk 101 at a high speed, and the magnetic head 103 flies above t...

AI Technical Summary

Problems solved by technology

However, this kind of coupling mainly occurs between the positive write line 1241 and the negative write line 1242; accordingly, it will be difficult to realize low impedance, high bandwidth and narrow width write lines at the same time

This is because the capacitive coupling is not strong enough, and the distribution of the electric field is not uniform enough

Eventually, the impedance of the flex circuit becomes larger, which in turn increases the signal transmission loss

On the other hand, this will narrow the frequency bandwidth, so this setting cannot meet actual needs

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