Abstract: The invention relates to aqueous polymer dispersions comprising polymerized units issued from the following monomers with related weight proportions based on 100 parts of weight of a)+b): a) 50 to 90% of a monoethylenically unsaturated non-ionic monomer, b) 10 to 50% of vinyl aromatic monomer or methyl methacrylate, c) 1 to 5% of a hydroxy-containing (meth)acrylate, d) 0.1 to 3% of acid monomer selected from d1) acid monomer selected from monocarboxylic or dicarboxylic acid monomers and d2) acid monomer selected from phosphorous-based or sulfur-based strong acid monomers or/and their salts, or from the mixtures of d1) and d2), e) 0.001 to 0.5% of chain transfer agent, and f) 0 to 1% one of internal crosslinker bearing at least two copolymerisable ethylenic unsaturations, the polymer having a Tg measured by DSC from ?30 to 0° C. and a gel content of 0 to 60%, formed during polymerization.

Abstract: A suspension comprises a flexure and a plurality of electrical traces. The flexure has a leading portion and a tailing portion, and has a laminated structure comprising a substrate layer, a dielectric layer, and a grounding layer sandwiched therebetween. The electrical traces comprise at least one pair of write traces, each write trace has a bonding pad positioned on the leading portion, a terminal pad positioned on the tailing portion, and a write wire connecting the bonding pad and the terminal pad, the write wire has at least one portion being furcated into at least two sub wires. The present invention can lower the impedance and decrease the signal transmission loss, and widen the frequency bandwidth simultaneously. The invention also discloses a HGA and a disk drive unit.

Abstract: A suspension comprises a flexure and a plurality of electrical traces. The flexure has a leading portion and a tailing portion, and has a laminated structure comprising a substrate layer, a dielectric layer, and a grounding layer sandwiched therebetween. The electrical traces comprise at least one pair of write traces, each write trace has a bonding pad positioned on the leading portion, a terminal pad positioned on the tailing portion, and a write wire connecting the bonding pad and the terminal pad, the write wire has at least one portion being furcated into at least two sub wires. The present invention can lower the impedance and decrease the signal transmission loss, and widen the frequency bandwidth simultaneously. The invention also discloses a HGA and a disk drive unit.

Abstract: A method is provided for reclaiming a suspension from a disk drive head gimbal assembly (HGA). An ultrasonic probe is applied to the HGA's read/write head slider on a side opposite that of its solder balls. Ultrasonic oscillations are transmitted through the ceramic slider to the side with the solder balls. The oscillations break the brittle intermetallic compound of the slider balls and free the slider. The ultrasonic energy also weakens the epoxy adhesive between the slider and suspension. The method can be used with heat to further weaken the solder balls and adhesive.

Abstract: A head gimbal assembly, including a slider, a suspension having a slider holding plate, and an accessory plate mounted on the suspension having a dimple to partially hold the slider holder plate.

Abstract: A slider touch-down preventing system for a head stack assembly, which includes a weight load to reduce the slider's movement; and a weight holder connecting with a suspension of the head stack assembly to hold the weight load. The weight holder is positioned at an opposite side of slider loading part of the suspension which has a structure to absorb vibration energy and is positioned beyond a middle portion of the suspension. The invention also discloses a HSA and a disk drive unit having such a slider touch-down preventing system.

Abstract: A head gimbal assembly includes a slider, a suspension to support the slider, and a flexible printed circuit provided to the suspension. The flexible printed circuit includes multiple traces to electrically connect the slider to a conductive tab and a test tab. The flexible printed circuit includes a grounding trace to ground the flexible printed circuit at the test tab.

Abstract: A head arm assembly comprises a slider, a drive arm, a trace; and a load beam having a hinge portion and a slider mounting portion; wherein the slider mounting portion has a slider support portion to support flying attitude of the slider. The slider support portion has a slider mounting frame with a flexible lifter to maintain the slider position in a predetermined position. In the present invention, the flexible lifter has a spring structure. The load beam may further comprise a stiffener formed in a longitudinal direction of the head arm assembly. The invention also discloses a head stack assembly and a disk drive using the head arm assembly.

Abstract: A micro-actuator for a head gimbal assembly includes a fixed portion connectable to a suspension of the head gimbal assembly and a movable portion connectable to a slider of the head gimbal assembly. A pair of frame ribs interconnect the fixed portion and the movable portion. A PZT element is mounted to each of the frame ribs. Each PZT element is excitable to cause selective movement of the frame ribs which causes movement of the movable portion to cause movement of the slider. A tongue is fixed to and extends from the fixed portion. The tongue is engagable with a pivot provided on the suspension of the head gimbal assembly. The tongue forms a gap between the movable portion and itself.

Abstract: A head gimbal assembly includes a slider, a suspension to support the slider, and a flexible printed circuit provided to the suspension. The flexible printed circuit includes multiple traces to electrically connect the slider to a conductive tab and a test tab. The flexible printed circuit includes a grounding trace to ground the flexible printed circuit at the test tab.

Abstract: A micro-actuator for a head gimbal assembly includes a fixed portion connectable to a suspension of the head gimbal assembly and a movable portion connectable to a slider of the head gimbal assembly. A pair of frame ribs interconnect the fixed portion and the movable portion. A PZT element is mounted to each of the frame ribs. Each PZT element is excitable to cause selective movement of the frame ribs which causes movement of the movable portion to cause movement of the slider. A tongue is fixed to and extends from the fixed portion. The tongue is engagable with a pivot provided on the suspension of the head gimbal assembly. The tongue forms a gap between the movable portion and itself.

Abstract: A head gimbal assembly, including a slider, a suspension having a slider holding plate, and an accessory plate mounted on the suspension having a dimple to partially hold the slider holder plate.

Abstract: A slider touch-down preventing system for a head stack assembly, which includes a weight load to reduce the slider's movement; and a weight holder connecting with a suspension of the head stack assembly to hold the weight load. The weight holder is positioned at an opposite side of slider loading part of the suspension which has a structure to adsorb vibration energy and is positioned beyond a middle portion of the suspension. The invention also discloses a HSA and a disk drive unit having such an slider touch-down preventing system.

Abstract: A head arm assembly comprises a slider, a drive arm, a trace; and a load beam having a hinge portion and a slider mounting portion; wherein the slider mounting portion has a slider support portion to support flying attitude of the slider. The slider support portion has a slider mounting frame with a flexible lifter to maintain the slider position in a predetermined position. In the present invention, the flexible lifter has a spring structure. The load beam may further comprise a stiffener formed in a longitudinal direction of the head arm assembly. The invention also discloses a head stack assembly and a disk drive using the head arm assembly.

Abstract: A system and a method for increasing suspension resonance frequencies of a head suspension assembly of a disc drive includes, in one example embodiment, attaching a base plate to an actuator arm assembly of the disc drive such that the base plate including the actuator arm assembly are in actuating relationship with a rotating disc of the disc drive. A two-piece suspension member having a first and second pieces is attached to the base plate. A gimbal is attached to the two-piece suspension member such that a predetermined bendable area is formed between the first and second pieces and on the gimbal having a stiffer preload bend radius. A stiffer preload bend radius provides a higher stiffness-to-mass ratio without increasing the spring rate of the head suspension assembly to increase suspension resonance frequencies of the head suspension assembly to fall outside a bandwidth of a servo drive to reduce off-track motion of the head suspension assembly during track follow-and-seek operations of the disc drive.

Abstract: A system and a method for increasing suspension resonance frequencies of a head suspension assembly of a disc drive includes, in one example embodiment, attaching a base plate to an actuator arm assembly of the disc drive such that the base plate including the actuator arm assembly are in actuating relationship with a rotating disc of the disc drive. A two-piece suspension member having a first and second pieces is attached to the base plate. A gimbal is attached to the two-piece suspension member such that a predetermined bendable area is formed between the first and second pieces and on the gimbal having a stiffer preload bend radius. A stiffer preload bend radius provides a higher stiffness-to-mass ratio without increasing the spring rate of the head suspension assembly to increase suspension resonance frequencies of the head suspension assembly to fall outside a bandwidth of a servo drive to reduce off-track motion of the head suspension assembly during track follow-and-seek operations of the disc drive.

Abstract: A head suspension includes a damping structure having at least one unconstrained surface. A reservoir is formed on the head suspension preferably from epoxy resin. Visco-elastic damping material is dispensed into the reservoir to form a damper on the head suspension. The damper and reservoir act to damp resonance mode vibrations of the head suspension.

Abstract: A head suspension includes a damper having a constraint layer formed unitarily with the flexure. The damper is located on the same face of the load beam as the flexure and acts to damp resonance vibrations of the head suspension. The constraint layer overlays the damper and is coupled to the flexure by a narrow neck. In this way, the constraint layer can be aligned and attached to the beam along with the flexure. This facilitates alignment of the constraint layer. Further, the narrowness of the neck coupling the constraint layer to the flexure reduces transmission of vibrations from the load beam to the flexure.