Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Reexamination Certificate
1999-04-02
2002-12-10
Letscher, George J. (Department: 2653)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
Reexamination Certificate
active
06493310
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a noise damping device for a rotating body and a disk player, and more particularly, to a noise damping device which has an improved structure so as to dampen noise generated by the flow of ambient air when a rotating body or a disk, disposed in a housing, rotates.
2. Description of the Related Art
In general, in a disk player such as a DVD player, a CD-ROM player, or a hard disk drive, a rotating body such as a hard disk or a compact disk is placed in a housing thereof. While rotating at high speed, such a rotating body generates noise due to fluctuation in the air surrounding the rotating body. Therefore, in the above apparatus, a noise dampening device for damping rotation noise of the rotating body is provided.
FIG. 1
is a partially cut away perspective view schematically illustrating a hard disk drive used as an auxiliary memory device of a computer.
Referring to
FIG. 1
, a hard disk drive is provided with a housing
10
, a hard disk
18
installed in the housing
10
and a noise damping device.
The housing
10
is installed in a computer main body (not shown), and comprises a base frame
12
supporting hard disks
18
and a cover frame
14
attached on the base frame
12
for protecting the hard disks
18
.
While the hard disks
18
are rotated by a driving source such as a spindle motor installed in the housing
10
, data are written to the hard disks
18
or written data are read from the hard disks
18
by a predetermined data writing/reading means (not shown). In addition, there are several hard disks
18
for increased storage capacity.
The noise damping device is attached to the outer surface of the cover frame
14
by an adhesive such as a bond or a double-sided bonding tape, and comprises a damper member
16
usually manufactured in a thin plate structure using stainless steel. The damper member
16
is specifically designed to mainly damp noise in a predetermined frequency range considering the rotation speed of the hard disks
18
. For example, when the hard disks
18
rotate at a rotation speed of about 12 m/s, the damper member
16
is designed to mainly damp noise in the range of around 1,500 Hz corresponding to the rotation speed.
In the hard disk drive having the above structure, when the hard disks
18
are rotated by the spindle motor so as to write data to or read written data from the hard disks
18
, as shown in
FIG. 2
, most of the air within the housing
10
tends to flow in &thgr; and R directions. Here, the air flowing in &thgr; direction is distributed at irregular pressures with respect to R directions, and the air in itself flows irregularly. When the irregular air flow impacts the inner walls of the housing
10
, the housing
10
is vibrated by the impact, and consequently, undesirable noise is generated. Further, when the air flowing in the R directions reaches the inner walls of the housing
10
, the air flow direction is changed to an r direction and the air is mixed with the air flowing in the &thgr; direction. Therefore, the air flow in the &thgr; direction becomes more irregular, and consequently, the noise is increased. Such noise is damped to some extent by the damper member
16
absorbing the vibration of the housing
10
.
However, in the above conventional art, since the damper member
16
for damping noise must be separately attached to the outer surface of the housing
10
, there are problems in that the manufacturing cost is high and more assembling operations are required. In addition, when the temperature within a computer main body and/or the housing
10
rises, the bonding force of the adhesive deteriorates due to the heat generated in the computer main body. Further, the damper member
16
can only control a predetermined frequency band. Thus, noise with various frequency bands, when the rotation speed of the hard disks
18
varies, cannot be effectively dampened.
SUMMARY OF THE INVENTION
The present invention provides a noise damping device for a rotating body capable of effectively dampening noise generated by the rotating body by modifying the structure of a housing.
Also, the present invention provides a noise damping device for a disk player capable of damping noise generated when a disk rotates by modifying the structure of parts installed in a housing.
Accordingly, to achieve the first objective, there is provided a noise damping device for a rotating body for dampening noise due to the air flow within a housing caused by the rotation of a rotating body, wherein an intaglio and/or cameo pattern of a predetermined shape is formed on inner surfaces of the housing.
Here, it is preferable that the housing includes a base on which the rotating body is placed, and a cover frame assembled to the base for covering the rotating body, and the pattern is formed on the upper surface of the base and the inner surface of the cover frame facing the rotating body.
In addition, it is preferable that the pattern is formed on the inner side surfaces of the housing.
In addition, it is preferable that the pattern has a starting point on the rotation axis of the rotating body, and is composed of a plurality of coaxial circles each having a predetermined width, the distances between neighboring circles are the same, and the coaxial circles have respective widths different from each other.
In addition, it is preferable that the pattern has a starting point on the rotation axis of the rotating body, is composed of a spiral having a predetermined width and is capable of guiding the air flow in radial directions from the starting point.
In addition, it is preferable that the pattern has a starting point on the rotation axis of the rotating body, is composed of radially disposed elements each having a predetermined width and is capable of guiding the air flow in radial directions from the starting point, and each of the radially disposed elements has a curved form.
In addition, it is preferable that the pattern is composed of a plurality of circles having a predetermined width and respective radii different from each other. The circles which touch neighboring circles guide the air flow guided by an inner circle toward an outer circle with respect to the rotation axis of the rotating body.
In addition, it is preferable that the pattern is composed of a plurality of dimples having a predetermined width and depth.
In addition, it is preferable that the device includes a vibration absorbing damper member installed on the outer surface of the housing.
To achieve the second objective, there is provided a noise damping device for a disk player for dampening noise due to the air flow within a housing caused by the rotation of a disk, wherein the device includes a disk tray which is movably installed to carry the disk into or out of the housing and is provided with a cameo and/or intaglio pattern of a predetermined shape formed on the surface of the disk tray facing the disk.
Here, it is preferable that the device further includes a clamping member which is installed within the housing for clamping the disk and is provided with a cameo and/or intaglio pattern of a predetermined shape formed on the surface of the clamping member facing the disk.
In addition, it is preferable that the device includes a noise absorbing member installed at the housing.
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Hong Soon-kyo
Kim Seong-hoon
Koh Byeong-cheon
Lee Sung-jin
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