U.S. patent application number 16/676091 was filed with the patent office on 2021-05-06 for air turbulence control for actuators.
The applicant listed for this patent is Seagate Technology LLC. Invention is credited to Xiong Liu, Yichao Ma, Yimin Niu, Lionel Young.
Application Number | 20210134331 16/676091 |
Document ID | / |
Family ID | 1000005535267 |
Filed Date | 2021-05-06 |
![](/patent/app/20210134331/US20210134331A1-20210506\US20210134331A1-2021050)
United States Patent
Application |
20210134331 |
Kind Code |
A1 |
Ma; Yichao ; et al. |
May 6, 2021 |
AIR TURBULENCE CONTROL FOR ACTUATORS
Abstract
A hard disk drive includes a base deck and a load/unload ramp
component. The base deck includes a floor and sidewalls. The
load/unload ramp component is coupled to the floor of the base
deck. At least one of the sidewalls includes an arcuate extension
portion that extends to contact the load/unload ramp component.
Inventors: |
Ma; Yichao; (Singapore,
SG) ; Niu; Yimin; (Eden Prairie, MN) ; Liu;
Xiong; (Singapore, SG) ; Young; Lionel;
(Singapore, SG) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Seagate Technology LLC |
Cupertion |
CA |
US |
|
|
Family ID: |
1000005535267 |
Appl. No.: |
16/676091 |
Filed: |
November 6, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G11B 25/043 20130101;
G11B 33/148 20130101 |
International
Class: |
G11B 33/14 20060101
G11B033/14; G11B 25/04 20060101 G11B025/04 |
Claims
1. A hard disk drive comprising: a base deck including a floor and
sidewalls; and a load/unload ramp component coupled to the floor of
the base deck, at least one of the sidewalls including an arcuate
extension portion extending to contact the load/unload ramp
component.
2. The hard disk drive of claim 1, wherein the arcuate extension
portion extends to contact the load/unload ramp component such that
there is no gap between the arcuate extension portion and the
load/unload ramp component.
3. The hard disk drive of claim 1, wherein a distal end of the
arcuate extension portion contacts the load/unload ramp
component.
4. The hard disk drive of claim 1, wherein the arcuate extension
portion blocks air from passing between the at least one of the
sidewalls and the load/unload ramp component.
5. The hard disk drive of claim 1, wherein the arcuate extension
portion includes a first arcuate surface and a second arcuate
surface opposite the first arcuate surface.
6. The hard disk drive of claim 1, wherein the arcuate extension
portion is thinner than a thickness of the sidewalls.
7. The hard disk drive of claim 1, wherein the floor includes an
arcuate slope portion that extends between a lower section of the
floor and an upper section of the floor.
8. The hard disk drive of claim 7, wherein an initial transition
line of the arcuate slope portion is 0.50-0.75 inches from a travel
path of a distal end of an actuator assembly.
9. The hard disk drive of claim 8, wherein the initial transition
line is shaped substantially similar to the travel path.
10. The hard disk drive of claim 7, wherein the arcuate slope
portion extends from the lower section to the upper section along
the arcuate extension portion.
11. The hard disk drive of claim 1, wherein the arcuate slope
portion extends between a spindle motor and the arcuate extension
portion.
12. The hard disk drive of claim 1, further comprising: a cover
coupled to the base deck such that a gap exists between a top of
the arcuate extension portion and the cover.
13. The hard disk drive of claim 12, wherein the gap ranges from
0.025-0.075 inches.
14. A base deck comprising: a floor including an arcuate slope
portion that extends between a lower section of the floor and an
upper section of the floor; and sidewalls extending around a
periphery of the floor, at least one of the sidewalls including an
extension that extends from the at least one sidewall, wherein the
arcuate slope portion transitions from the lower section to the
upper section along the extension.
15. The base deck of claim 14, wherein the extension is thinner
than a thickness of the sidewalls.
16. The base deck of claim 14, wherein the arcuate slope portion
begins at an initial transition line adjacent the extension.
17. The base deck of claim 14, wherein the arcuate slope portion
extends between a spindle motor portion and the extension.
18.-20. (canceled)
21. A base deck comprising: a floor including an arcuate slope
portion that extends between a lower section of the floor and an
upper section of the floor; sidewalls extending around a periphery
of the floor, at least one of the sidewalls including an extension
that extends from the at least one sidewall, wherein the arcuate
slope portion transitions from the lower section to the upper
section along the extension; and a load/unload ramp component
coupled to the floor.
22. The base deck of claim 21, wherein the extension is thinner
than a thickness of the sidewalls.
23. The base deck of claim 21, wherein the arcuate slope portion
begins at an initial transition line adjacent the extension.
Description
SUMMARY
[0001] In certain embodiments, a hard disk drive includes a base
deck and a load/unload ramp component. The base deck includes a
floor and sidewalls. The load/unload ramp component is coupled to
the floor of the base deck, and at least one of the sidewalls
includes an arcuate extension portion that extends to contact the
load/unload ramp component.
[0002] In certain embodiments, a base deck includes a floor and
sidewalls. The floor includes an arcuate slope portion that extends
between a lower section of the floor and an upper section of the
floor. The sidewalls extend around a periphery of the floor, and at
least one of the sidewalls includes an extension that extends from
the at least one sidewall. The arcuate slope portion transitions
from the lower section to the upper section along the
extension.
[0003] In certain embodiments, a method for making a base deck is
disclosed. The method includes forming a floor with an arcuate
slope portion that extends between a lower section of the floor and
an upper section of the floor, forming sidewalls extending around a
periphery of the floor, and forming an extension portion that
extends from one of the sidewalls away from the periphery of the
floor. The arcuate slope portion transitions from the lower section
to the upper section along the extension.
[0004] While multiple embodiments are disclosed, still other
embodiments of the present invention will become apparent to those
skilled in the art from the following detailed description, which
shows and describes illustrative embodiments of the invention.
Accordingly, the drawings and detailed description are to be
regarded as illustrative in nature and not restrictive.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 shows a top view of portions of a hard disk drive, in
accordance with certain embodiments of the present disclosure.
[0006] FIG. 2 shows a perspective view of portions of the hard disk
drive of FIG. 1, in accordance with certain embodiments of the
present disclosure.
[0007] FIG. 3 shows a cut-away, side view of portions of the hard
disk drive of FIG. 1, in accordance with certain embodiments of the
present disclosure.
[0008] FIG. 4 shows a top view of an alternative design of a hard
disk drive.
[0009] FIG. 5 shows a perspective view of portions of the
alternative design of the hard disk drive of FIG. 4.
[0010] FIG. 6 shows a block diagram of a method for making a hard
disk drive, in accordance with certain embodiments of the present
disclosure.
[0011] While the disclosure is amenable to various modifications
and alternative forms, specific embodiments have been shown by way
of example in the drawings and are described in detail below. The
intention, however, is not to limit the disclosure to the
particular embodiments described but instead is intended to cover
all modifications, equivalents, and alternatives falling within the
scope the appended claims.
DETAILED DESCRIPTION
[0012] When hard disk drives operate, air circulates within the
internal cavities of the hard disk drives. Left uncontrolled, this
circulating air can negatively affect stability and performance of
components of the hard disk drives. For example, turbulent air can
cause rotating magnetic recording media to vibrate or "flutter"
and/or sliders to be knocked off track and out of position. These
events can cause errors (e.g., track misregistration errors) when
writing data to or reading data from the rotating magnetic
recording media. The risk and effect of error increases as areal
density continues to increase in hard disk drives. Certain
embodiments of the present disclosure are accordingly directed to
controlling air flow within hard disk drives.
[0013] FIG. 1 shows a hard disk drive 100 including a base deck
102. The base deck 102 includes a base member or a floor 104 with
sidewalls 106 that form an internal cavity in which various hard
disk drive components are positioned. As shown in FIG. 1, the
sidewalls 106 extend around a periphery of the floor 104. When the
hard disk drive 100 is assembled, a cover 107 (shown in FIG. 3) is
coupled to the base deck 102 to enclose the hard disk drive
components within the internal cavity.
[0014] FIG. 1 shows the hard disk drive 100 with an actuator
assembly 108, which can rotate around a pivot bearing 110. The
actuator assembly 108 positions read/write heads 112 over data
tracks on rotating magnetic recording media (not shown). During
operation, a spindle motor 114 rotates the magnetic recording media
while the actuator assembly 108 is driven by a voice coil motor
assembly (a coil portion 116 of which is shown in FIG. 1) to pivot
around the pivot bearing 110. The read/write heads 112 write data
to the magnetic recording media by generating and emitting a
magnetic field towards the magnetic recording media which induces
magnetically polarized transitions on the desired data track on the
magnetic recording media. The magnetically polarized transitions
are representative of the data. The read/write heads sense (or
"read") the magnetically polarized transitions with a magnetic
transducer. As the magnetic recording media rotates adjacent the
read/write heads 112, the magnetically polarized transitions induce
a varying magnetic field into a magnetic transducer of the
read/write heads 112. The magnetic transducer converts the varying
magnetic field into a read signal that is delivered to a
preamplifier and then to a read channel for processing to be used
by a host system (e.g., server, laptop computer, desktop
computer).
[0015] When the read/write heads 112 are not positioned over the
magnetic recording media, lift tabs at the distal ends of the
actuator assembly 108 can rest on a load/unload ramp component 118.
The load/unload ramp component 118 is coupled to the floor 104 of
the base deck 102 by a fastener. The load/unload ramp component 118
includes ramp-like surfaces on which the lift tabs of the actuator
assembly 108 slide on when being loaded onto or unloaded from the
load/unload ramp component 118.
[0016] As mentioned above, during operation of the hard disk drive
100, air circulates throughout the internal cavity and around the
components of the hard disk drive 100. This air can affect the
ability of the hard disk drive 100 to accurately write and read
data. FIGS. 1-3 show various features that help reduce the amount
of air turbulence created or existing at vulnerable parts of the
hard disk drive 100 while FIGS. 4 and 5 show an alternative design
of a hard disk drive 200 that does not include the
air-turbulence-reducing features shown in FIGS. 1-3.
[0017] FIGS. 1 and 2 show the sidewall 106 closest to the
load/unload ramp component 118 including an extension portion 120.
In certain embodiments, the extension portion 120 is arcuate-shaped
such that the extension portion 120 extends the shape of the
sidewall 106. For example, the sidewall 106 shown in FIG. 1
includes a wall surface 122 that is arcuate-shaped such that a
distance between the wall surface 122 and the disk-shaped magnetic
recording media remains substantially the same. This type of wall
surface 122 can help maintain stability of the magnetic recording
media and is sometimes referred to as a shroud. As such, in
embodiments where the extension portion 120 extends the shape of
the sidewall 106, the extension portion 120 can include an arcuate
surface 124.
[0018] The extension portion 120 shown in FIGS. 1 and 2 extends
from the sidewall 106 towards the load/unload ramp component 118.
In certain embodiments, the extension portion 120 directly contacts
(e.g., at a distal end of the extension portion 120) the
load/unload ramp component 118 such that there is no gap between
the load/unload ramp component 118 and the extension portion 120.
As such, the extension portion 120 blocks air that would otherwise
pass between the sidewall 106 and the load/unload ramp component
118.
[0019] In contrast to the hard disk drive 100 of FIG. 1, the hard
disk drive 200 shown in FIGS. 4 and 5 lacks a feature like the
extension portion 120 and therefore allows air to pass between a
sidewall 206 and a load/unload ramp component 218, as indicated by
the arrow 250 shown in FIG. 4. This air can create turbulence that
affects the stability of the read/write heads 112 and the magnetic
recording media. However, for the hard disk drive 100 of FIGS. 1-3,
air that enters the area between the sidewall 106 and the
load/unload ramp component 118 is blocked by the extension portion
120. Put another away, the extension portion 120 helps trap
turbulent air behind the load/unload ramp component 118 to reduce
the negative effects of turbulent air on the read/write heads 112
and the magnetic recording media. Further, the extension portion
120 provides an extension of the shroud sidewall 106. Therefore,
the extension portion 120 shown in FIGS. 1-3 can help mitigate the
negative effect of air on the stability of the read/write heads 112
and the magnetic recording media and overall performance of the
hard disk drive 100.
[0020] In certain embodiments, as shown in FIGS. 1 and 2, the
extension portion 120 is thinner than a thickness of the sidewalls.
In certain embodiments, the extension portion 120 includes a second
arcuate surface 126 that is opposite the arcuate surface 124. This
second arcuate surface 126 may help guide air into and out of the
space created by the sidewall 106, the extension portion 120, and
the load/unload ramp component 118.
[0021] FIG. 3 shows a cut-away view of a portion of the hard disk
drive 100 with the cover 107 coupled to the base deck 102 via a
fastener 128. A gasket 130 is positioned between the cover 107 and
the sidewall 106 to seal the hard disk drive 100 and prevent
contaminants from entering the internal cavity of the hard disk
drive 100. The sidewall 106 includes a raised portion 132 (also
shown in FIGS. 1 and 2), which includes a hole 134 that is shaped
to receive the fastener 128. With the cover 107 directly contacting
the raised portion 132, there is a small gap 136 between the cover
107 and the extension portion 120 that may permit some air to pass
through the gap 136. In certain embodiments, the gap 136 ranges
0.025-0.075 inches. In certain embodiments, the extension portion
120 has a height (measured from the floor 104 of the base deck 102)
that is at least as tall as the height of the load/unload ramp
component 118.
[0022] Additionally or alternatively, the hard disk drive 100 can
include an air-turbulence-reducing feature in the form of a slope
portion 138 that is positioned a farther-than-typical distance away
from the travel path (represented by arrows and reference number
140) of the read/write heads 112. FIGS. 1 and 2 show the floor 104
of the base deck 102 including a lower section 142 and an upper
section 144 with the slope portion 138 extending between the lower
section 142 and the upper section 144 as the floor 104 transitions
between the two sections. For example, as best seen in FIG. 2, the
slope portion 138 starts at an initial transition line 146
(adjacent the extension portion 120) and begins to slope upward to
until reaching a height of the upper section 144 of the floor 104.
This transition from the lower section 142 and the upper section
144 occurs along the extension portion 120 as shown in FIG. 2.
[0023] The slope portion 138 also extends lengthwise between the
extension portion 120 and the spindle motor 114. As the slope
portion 138 extends between the extension portion 120 and the
spindle motor 114, the shape of the slope portion 138 curves (e.g.,
is arcuate-shaped) such that it is substantially similar to the
travel path 140 of the distal end of the actuator assembly 108 near
where the read/write heads 112 are positioned.
[0024] The lower section 142 of the floor 104 allows the hard disk
drive 100 to include more space between the floor 104 and the cover
107. As such, more arms of the actuator assembly 108 (and therefore
more read/write heads 112) can fit into the hard disk drive 100.
However, to create the lower section 142 of the floor 104, the base
deck 102 needs to be thinner at the lower section 142 compared to
the thickness of the base deck 102 at the upper section 144.
Reducing the thickness of the base deck 102 results in the base
deck 102 being less rigid and therefore more susceptible to
deformation and vibration. As a result, the slope portion 138 is
typically positioned such that the lower section 142 allows for
additional read/write heads 112 to be positioned in the hard disk
drive 100 but consumes the least amount of area of the base deck
102 so that rigidity of the base deck 102 is not compromised. For
example, as shown in FIGS. 4 and 5, the slope portion 238 of the
hard disk drive 200 is positioned such that a portion of the
actuator assembly 208 where the read/write heads 212 are positioned
passes over the slope portion 238 during operation. Put another
way, the travel path (represented by arrows and reference number
240) of the read/write heads 212 is along and over the slope
portion 238. This arrangement increases the space between the floor
204 and the cover (not shown in FIGS. 4 and 5) for additional
read/write heads 212, but minimizes the area consumed by a thinner
portion of the base deck 102.
[0025] However, as air passes along the slope portion 238, the air
can become turbulent. This turbulence can affect positioning of the
read/write heads 212. The effect is most problematic for the
read/write head 212 positioned closest to the floor 204, but the
turbulence will affect positioning of other read/write heads 212 on
the actuator assembly 208. The closer the slope portion 238 is
positioned to the distal end of the actuator assembly 208, the more
likely turbulent air will affect the read/write heads 212.
[0026] As such, the slope portion 138 of the hard disk drive 100 of
FIGS. 1-3 is positioned away from the travel path 140 of the distal
end of the actuator assembly 108. In certain embodiments, the
initial transition line 146 of the slope portion 138 is positioned
0.50-0.75 inches from the travel path 140 of the distal end of the
actuator assembly 108. Positioning the slope portion 138 further
away from the read/write heads 112 reduces the effects of turbulent
air on the read/write heads 112 created by the slope portion 138.
This reduction of turbulent air is particularly effective for the
read/write head 112 positioned closest to the floor 104 of the base
deck 102. Further, it has been found that the increase in the
thinner area of the base deck 102 has a negligible effect on the
overall reduction in stiffness of the base deck 102.
[0027] As described above, FIGS. 1-3 show various features that
help reduce the amount of air turbulence created or existing at
vulnerable parts of the hard disk drive 100. In certain
embodiments, the extension portion 120 helps to block turbulent air
that would otherwise pass between the sidewall 106 and the
load/unload ramp component 118 towards the read/write heads 112 and
the magnetic recording media. Additionally or alternatively, the
hard disk drive 100 can include an air-turbulence-reducing feature
in the form of a slope portion 138 that is positioned a
farther-than-typical distance away from the travel path 140 of the
read/write heads 112. Therefore, the various features shown in
FIGS. 1-3 and described above can help mitigate the negative effect
of air on the stability of the read/write heads 112 and the
magnetic recording media and overall performance of the hard disk
drive 100.
[0028] FIG. 6 shows a block representation of steps of a method 300
for making the base deck 102. The method 300 includes forming the
floor 104 of the base deck 102 with the slope portion 138 that
extends between the lower section of the floor 104 and the upper
section of the floor 104 (block 302 in FIG. 6). The method 300
further includes forming the sidewalls 106 extending around a
periphery of the floor 104 (block 304 in FIG. 6). The method 300
further includes forming the extension portion 120 that extends
from one of the sidewalls 106 away from the periphery of the floor
104 (block 306 in FIG. 6). As shown in FIG. 2, the slope portion
138 transitions from the lower section to the upper section along
the extension.
[0029] In certain embodiments, the forming steps of the method 300
can include machining, casting, and/or forging. For example, the
base deck 102 can be made by first making a casting or forging of
the base deck 102 with the floor 104 and the sidewalls 106. Next,
various features of the base deck 102 (e.g., the extension portion
120, the slope portion 138) can be machined by a material-removal
process. After the features of the base deck 102 are created,
components of the hard disk drive 100 (e.g., the actuator assembly
108, the spindle motor 114, and the like) can be assembled to the
base deck 102. Finally, the cover 107 can be attached to the base
deck 102 to enclose the components.
[0030] Various modifications and additions can be made to the
embodiments disclosed without departing from the scope of this
disclosure. For example, while the embodiments described above
refer to particular features, the scope of this disclosure also
includes embodiments having different combinations of features and
embodiments that do not include all of the described features.
Accordingly, the scope of the present disclosure is intended to
include all such alternatives, modifications, and variations as
falling within the scope of the claims, together with all
equivalents thereof.
* * * * *