Method and apparatus for dampening and filtering air flow effects in a hard disk drive
View Patent ↗A hard disk drive is disclosed including at least one air filter mounted on a shroud wall of the base and at least two disk dampers where at least one disk damper covers a fraction of the maximal covering angle configured with the air filter to optimize both the air filter and disk dampening. Methods of manufacturing the hard disk drive are also disclosed.
1. A hard disk drive, comprising:
a base including a shroud wall further including an air filter;
a spindle motor mounted on the base and rotatably coupled to a bottom disk and a top disk;
a first damper mounted to the shroud wall between the bottom disk and the top disk and having a first covering angle of at most a maximal covering angle; and
a second damper mounted to the shroud wall and over the bottom disk and the top disk and having a second covering angle less than the first covering angle.
2. The hard disk drive of claim 1 , wherein said shroud wall further includes a chamber including said air filter.
3. The hard disk drive of claim 2 , wherein said shroud wall further includes a second chamber.
4. The hard disk drive of claim 1 , further comprising:
a middle disk rotatably coupled to the spindle motor and located between the first damper and the top disk; and
a third damper mounted to the shroud wall between the top disk and the middle disk and having a third covering angle greater than or equal to the second covering angle and less than the maximal covering angle.
5. The hard disk drive of claim 1 , wherein the second covering angle is at least thirty percent of the maximal covering angle and the third covering angle is at least fifty percent of the maximal covering angle.
6. The hard disk drive of claim 1 , wherein the shroud wall includes:
an intake, coupled to the air filter, for providing a first entrance for air current generated by the movement of the top disk, the bottom disk, the middle disk, or a combination thereof; and
a second intake, connected to the intake, for creating a pulling force for the air current entering through the intake by providing a second entrance for the air current.
7. The hard disk drive of claim 1 , wherein the shroud wall includes:
an intake, coupled to the air filter, for providing an entrance for air current generated by the movement of the the top disk, the bottom disk, the middle disk, or a combination thereof; and
an outlet channel, connected to the intake and having a smaller cross-section than the intake, for providing an exit for the air current.
8. The hard disk drive of claim 1 , wherein the first covering angle is at most eighty percent of the maximal covering angle.
9. A method of manufacturing a hard disk drive, comprising the steps of:
providing a base including a shroud wall including an air filter;
assembling a first damper between a bottom disk and a top disk with a second damper over the bottom disk and the top disk, all rotating coupled to a spindle motor;
mounting the spindle motor to the base;
mounting the first damper and the second damper to the shroud wall;
wherein assembling includes:
providing the first damper having a first covering angle of at most a maximal covering angle, and
providing the second damper having a second covering angle less than the first covering angle and the maximal covering angle.