Damping material to increase a damping ratio
OwnerHajime Eguchi, Naoaki Kanadainventors
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Abstract
A damping material to increase a damping ratio is disclosed. In one embodiment, an actuator arm assembly of a hard-disk drive (HDD) comprises an actuator arm. A viscoelastic layer is coupled with the actuator arm. A constraining layer is coupled with the viscoelastic layer on a side of the viscoelastic layer opposite the actuator arm. The coupling of the actuator arm, the viscoelastic layer, and the constraining layer occurs over an area which is a fraction of the area between the constraining layer and the actuator arm.
Claims25
An actuator arm assembly for a hard-disk drive (HDD) comprising:
- an actuator arm;
- a viscoelastic layer coupled with said actuator arm;
- and
- a constraining layer coupled with said viscoelastic layer on a side of said viscoelastic layer opposite said actuator arm and wherein the coupling of said actuator arm, said viscoelastic layer, and said constraining layer is performed over an area which is a fraction of the total area between said constraining layer and said actuator arm.
A disk drive comprising:
- at least one data storage disk rotatably mounted in said disk drive;
- and
- a rotary actuator comprising at least one actuator arm, said at least one actuator arm having a read-write head, said at least one actuator arm further comprising;
- a viscoelastic layer coupled with said actuator arm;
- and
- a constraining layer coupled with said viscoelastic layer on a side of said viscoelastic layer opposite said actuator arm and wherein the coupling of said actuator arm, said viscoelastic layer, and said constraining layer is performed over an area which is a fraction of the total area between said constraining layer and said actuator arm.
A hard-disk drive (HDD) including an actuator arm configured with a damping material to increase a damping ratio, said HDD comprising:
- a magnetic-recording disk;
- a disk enclosure comprising a disk-enclosure base;
- a spindle motor affixed in said disk-enclosure base, for rotating said magnetic-recording disk;
- an actuator arm configured with a viscoelastic layer coupled with said actuator arm and a constraining layer coupled with said viscoelastic layer on a side of said viscoelastic layer opposite said actuator arm and wherein the coupling of said actuator arm, said viscoelastic layer, and said constraining layer is performed over an area which is a fraction of the total area between said constraining layer and said actuator arm;
- and
- a HGA attached to said actuator arm, said HGA comprising:
- a gimbal;
- a head-slider coupled with said gimbal, comprising:
- a slider;
- a magnetic-recording head coupled with said slider, said magnetic-recording head comprising:
- a write element configured to write data to said magnetic-recording disk;
- and
- a read element configured to read data from said magnetic-recording disk.
Dependencies are inferred from the claim text.