Method for adjusting the pitch and roll static torques in a disk drive head suspension assembly
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorQinghua Zeng
Life of this patent
Estimating the term…
Abstract
A method for adjusting the pitch and roll static torques (PST and RST) on a slider in a disk drive head-suspension assembly (HSA) during manufacturing assures that each HSA is manufactured with acceptable PST and RST values. The method includes measuring each slider's pitch and roll static attitudes (PSA and RSA) and determining each HSA's pitch and roll torsional stiffnesses. These values are then used to calculate the required amount of adjustment to PSA and RSA to achieve the desired values of PST and RST for each HSA. The suspension is then adjusted, such as by heating the flexure with a laser.
Claims29
A method for adjusting a static torque on a slider in a head-suspension assembly comprising:
- measuring a static attitude component of the slider;
- determining the attitude component torsional stiffness of the head-suspension assembly by determining the attitude component effective moment-of-inertia of the slider;
- calculating, from the measured static attitude component and the determined torsional stiffness, the adjustment of the static attitude component required to achieve the desired static torque;
- and
- adjusting the static attitude component.
A method for adjusting the pitch static torque on a slider in a head-suspension assembly that includes a load beam, an air-bearing slider supporting a read/write head, and a flexure connecting the slider to the load beam and permitting the slider to pitch about a pitch axis and roll about a roll axis, the method comprising:
- measuring the pitch static attitude of the slider;
- determining the pitch torsional stiffness of the head-suspension assembly by determining the effective moment-of-inertia of the slider about the pitch axis and measuring the pitch natural frequency of the slider;
- calculating, from the measured pitch static attitude and the determined pitch torsional stiffness, the adjustment of the pitch static attitude required to achieve the desired pitch static torque;
- and
- adjusting the pitch static attitude.
A method for adjusting the roll static torque on a slider in a head-suspension assembly that includes a load beam, an air-bearing slider supporting a read/write head, and a flexure connecting the slider to the load beam and permitting the slider to pitch about a pitch axis and roll about a roll axis, the method comprising:
- measuring the roll static attitude of the slider;
- determining the roll torsional stiffness of the head-suspension assembly by determining the effective moment-of-inertia of the slider about the roll axis and measuring the roll natural frequency of the slider;
- calculating, from the measured roll static attitude and the determined roll torsional stiffness, the adjustment of the roll static attitude required to achieve the desired roll static torque;
- and
- adjusting the roll static attitude.
Dependencies are inferred from the claim text.