Head disk assembly including ramp having pivoting locational features
US6344950B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1999 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Sep 27, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A head disk assembly includes a disk, a head stack assembly and a ramp-defining structure. The disk has a recording surface surrounded by an outer circumference and the head stack assembly has an actuator pivot axis and a head gimbal assembly. The head gimbal assembly includes a gimbal defining a gimbal axis parallel to and spaced a first distance from the actuator pivot axis, and a lift tab having a lift-surface portion spaced a second, larger distance from the actuator pivot axis. The ramp-defining structure includes a wall extending parallel to the actuator pivot axis, an axis-defining portion defining a retraction pivot axis and a shelf projecting from the wall to define a bearing surface against which the lift-surface portion slides during unloading and loading operations. The bearing surface has a meandering and undulating shape to define a retention portion and a cam portion, the retention portion defining an arc relative to the retraction pivot axis, and the cam portion defining an arc elative to the actuator pivot axis. The ramp-defining structure is releasably secured relative to the disk such that in a secured condition the cam portion overlies the outer circumference an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.