Base plate having filter fixing protrusion for hard disk drive and hard disk drive including the same

A base plate for a hard disk drive including a disk accommodating part on which a disk having data stored therein is disposed; a head seating part formed to be lower than a position of the disk accommodating part and including a head driver disposed thereon providing driving force to a read-write head reading the data stored on the disk and writing data thereto; a filter seated on the disk accommodating part and collecting foreign objects from air flowing during rotation of the disk; and a filter fixing protrusion formed by exerting pressure on a bottom surface of the disk accommodating part in a predetermined position to allow the predetermined position to protrude, and fixing the filter.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Korean Patent Application No. 10-2011-0133468 filed on Dec. 13, 2011, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a base plate for a hard disk drive and a hard disk drive including the same, and more particularly, to a base plate for a hard disk drive having an improved filter assembly structure so that the structure may be applied to a base plate manufactured in a pressing process or a forging method, and a hard disk drive including the same.

2. Description of the Related Art

In general, a hard disk drive (HDD), a computer information storage device, reads data stored on a disk or writes data to the disk by using a read-write head.

In a hard disk drive, a base plate is commonly provided with a head driver, that is, ahead stack assembly (HSA), capable of moving the read-write head across the disk. The read-write head performs its function while moving to a desired position in a state in which it is suspended at a predetermined height above a writing surface of the disk by the head driver.

According to the related art, in manufacturing the base plate provided in the hard disk drive, a post-processing scheme of die-casting aluminum (Al) and then removing burrs or the like generated due to the die-casting, has been used.

However, in the die-casting scheme according to the related art, since a process of injecting aluminum (Al) for forging in a molten state to form a form is performed, high temperatures and high pressures are required, such that a large amount of energy is required in the process and processing time may be increased.

Further, in terms of a lifespan of a die-casting mold, there is a limitation in manufacturing a large number of base plates using a single mold, and a base plate manufactured by the die-casting process may have poor dimensional precision.

Therefore, in order to solve defects in the die-casting process, the base has been manufactured using a pressing process or forging method. However, in the case of manufacturing the base plate using a press processing or forging method, the base plate can be provided with a uniform thickness, such that a precise shape thereof may be difficult to implement.

Particularly, in the hard disk drive, foreign objects present in air flowing during rotation of the disk are collected by a filter, such that the inflow of foreign objects such as fine particles into a read-write head is prevented. Here, since the filter has a relatively thin shape, a structure for fixing the filter to the base plate is required.

However, in the case of using a pressing process or forging method, it may be difficult to implement a structure for fixing the filter, such that reliability of the hard disk drive may be deteriorated.

Therefore, research into technology for improving a filter assembly structure so as to firmly fix the filter, even in the case of using a press processing or forging method, has been urgently demanded.

SUMMARY OF THE INVENTION

An aspect of the present invention provides a base plate for a hard disk drive capable of firmly fixing a filter even in the case of using a pressing process or forging method, and a hard disk drive including the same.

According to an aspect of the present invention, there is provided a base plate for a hard disk drive, including: a disk accommodating part on which a disk having data stored therein is disposed; a head seating part formed to be lower than a position of the disk accommodating part and including a head driver disposed thereon providing driving force to a read-write head reading the data stored on the disk and writing data thereto; a filter seated on the disk accommodating part and collecting foreign objects from air flowing during rotation of the disk; and a filter fixing part formed by punching a portion of the disk accommodating part and vertically raising the portion of the disk accommodating part, and fixing the filter.

The disk accommodating part may include a seating groove formed in a predetermined position thereof, on which the filter is fixedly seated.

The base plate for a hard disk drive may further include a side wall part formed outside of the disk accommodating part to enclose an outer peripheral surface of the disk.

The side wall part may include a groove formed therein, and one side of the filter may be seated in the groove.

The base plate for a hard disk drive may further include a sealing member sealing a punched portion of the disk accommodating part.

According to another aspect of the present invention, there is provided a base plate for a hard disk drive, including: a disk accommodating part on which a disk having data stored therein is disposed; a head seating part formed to be lower than a position of the disk accommodating part and including a head driver disposed thereon providing driving force to a read-write head reading the data stored on the disk and writing data thereto; a filter seated on the disk accommodating part and collecting foreign objects from air flowing during rotation of the disk; and a filter fixing protrusion formed by exerting pressure on a bottom surface of the disk accommodating part in a predetermined position to allow the predetermined position to protrude, and fixing the filter.

The base plate for a hard disk drive may further include a side wall part formed outside of the disk accommodating part to enclose an outer peripheral surface of the disk.

The side wall part may include a groove formed therein, and one side of the filter may be seated in the groove.

According to another aspect of the present invention, there is provided a hard disk drive, including: the base plate for a hard disk drive as described above; a spindle motor coupled to the base plate for a hard disk drive to rotate a disk; a read-write head reading data from and writing data to the disk; and a head driver moving the read-write head to a predetermined position on the disk.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the drawings, the shapes and dimensions of elements maybe exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like elements.

FIG. 1is a schematic exploded perspective view showing a hard disk drive according to an embodiment of the present invention.

Referring toFIG. 1, the hard disk drive according to the embodiment of the present invention may include a base plate100for a hard disk drive (hereinafter, referred to as a base plate), a spindle motor200, a head driver300, and a filter400.

The base plate100may be a housing forming an outer casing together with a cover plate190in the hard disk drive according to the embodiment of the present invention and may include a disk accommodating part110, a head seating part120, a side wall part130, and a filter fixing part140.

Here, the base plate100and the cover plate190may be coupled to each other using a plurality of screws195to be inserted into holes112formed in the base plate100.

The disk accommodating part110, a part on which a disk500coupled to a spindle motor200to be described below is disposed, may have the disk500positioned thereon, wherein the disk500has data stored thereon.

In the disk accommodating part110, the filter fixing part140or a filter fixing protrusion170may formed so that a filter400to be described below is fixed, and a seating groove150on which the filter400is seated may be formed. A description thereof will be provided below through various embodiments.

The disk accommodating part110may be formed to have a generally circular shape so as to correspond to a shape of the disk500, and a portion of the disk accommodating part110may be stepped to configure the head seating part120on which a head driver300to be described below is disposed.

Here, the reason for which the head seating part120is positioned to be lower than the disk accommodating part110is to provide a space in which the head driver300may be repeatedly rotated so as to allow data to be read from and written to the disk500.

That is, the reason is to secure a space in which the head driver300provides driving force to a read-write head (not shown) to insert the read-write head (not shown) into the disk500, thereby reading data from and writing data to the disk500.

The side wall part130may be formed outside of the disk accommodating part110so as to enclose an outer peripheral surface of the disk500.

A groove160may be formed in the side wall part130in a predetermined position therein, so that one side of a filter400to be described below may be seated therein.

The spindle motor200, provided to rotate the disk500, may be fixedly installed in the center of the disk accommodating part110. The disk500, coupled to the spindle motor200to rotate together therewith, may have a writing surface on which data can be written.

Here, the spindle motor200may include a clamp210coupled to an upper end portion thereof by a screw215in order to firmly fix the disk500thereto.

In addition, althoughFIGS. 1 and 2show a configuration in which a single disk is mounted on the spindle motor200, this configuration is only an example. That is, one or more disks500may be mounted on the spindle motor200. In the case in which a plurality of disks500are mounted thereon, a circular ring-shaped spacer for maintaining an interval between the disks500may be disposed therebetween.

The head driver300may be known as a head stack assembly (HAS) and may be a component having a read-write head (not shown) mounted thereon and moving the read-write head (not shown) to a predetermined position to write data to the disk500or read data from the disk500.

The head driver300may include a voice coil motor (VCM), a swing arm320, and a suspension330, wherein the suspension330may be fixedly coupled to a front end portion of the swing arm320.

In addition, the head driver300may be coupled to the base plate100so as to be rotatable around a pivot axis180of the head seating part120of the base plate100. When the disk500rotates on the disk accommodating part110of the base plate100at a relatively high speed, the read-write head (not shown) may serve to read the data from the writing surface of the disk500or write data to the writing surface of the disk500.

Here, the VCM, a component providing rotational driving force to the head driver300, may include magnets (not shown) disposed in upper and lower sides of a VCM coil310of the head driver300.

The VCM may be controlled by a servo control system and may rotate the head driver300around the pivot axis180according to Fleming's left hand rule by interaction between current input by the VCM coil310and a magnetic field formed by the magnets (not shown).

Here, when an operation start command is input to the hard disk drive according to the embodiment of the present invention, the disk500starts to rotate, and the VCM rotates the swing arm320in a counterclockwise direction to move the read-write head (not shown) onto the writing surface of the disk500.

On the other hand, when an operation stop command is input to the hard disk drive according to the embodiment of the present invention, the VCM rotates the swing arm320in a clockwise direction to allow the read-write head (not shown) to deviate from the disk500.

The read-write head (not shown) deviating from the writing surface of the disk500may be parked in a ramp360provided outside the disk500.

In addition, a corner portion of one side of the base plate100may be provided with a flexible printed board (FPC) bracket370in order to connect a flexible printed circuit (FPC) board (not shown) connected to the head driver300to a main circuit board (not shown) disposed under the base plate100.

The filter400may be a component seated on the disk accommodating part110, collecting foreign objects from air flowing during rotation of the disk500, and preventing inflow of the foreign objects into the read-write head (not shown) to thereby improve reliability of the hard disk drive.

During a hard disk assembly process, foreign objects such as fine particles may remain in the hard disk drive, and when external impact is applied or the disk500starts to rotate or stops, foreign objects may be generated by friction of a surface of the disk500.

As described above, when the foreign objects remain in the hard disk drive, in the case in which the foreign objects on the surface of the disk500and the read-write head (not shown) collide with each other during rotation of the disk500, the read-write head (not shown) and the surface of the disk500may be damaged. Therefore, data writing and reading performance or reliability of the read-write head (not shown) may be deteriorated.

Due to the above-mention reason, the filter400capable of collecting the foreign objects on the hard disk drive may be provided. This filter400may have a structure such as a sponge so as to collect the foreign material and allow air to pass therethrough.

The filter may be fixed to the base plate100by the filter fixing part140or the filter fixing protrusion170provided in the base plate100, which will be described below with reference toFIGS. 2A through 4.

FIGS. 2A through 2Care schematic perspective views of a base plate provided in the hard disk drive according to the embodiment of the present invention.

Referring toFIG. 2A, in a base plate100for a hard disk drive provided in the hard disk drive according to the embodiment of the present invention, a basic configuration may be formed by performing a pressing process or forging process on a plate, that is, a cold rolled steel sheet (SPCC, SPCE, or the like). Then, the entire shape may be completed by performing a post process such as a bending process, a cutting process, and the like.

That is, a primary base plate100including a disk accommodating part110, a head seating part120disposed to be lower than a position of the disk accommodating part110, and a side wall part130formed outside of the disk accommodating part to enclose most of the outer peripheral surface of the disk500may be manufactured.

Here, the pressing process or forging process according to the embodiment of the present invention in order to prevent defects such as large energy consumption and a long processing time in the existing die-casting process may be significantly effective in consideration of process efficiency, but there is a limitation in implementing a separate structure for fixing the above-mentioned filter400due to characteristics of the pressing process or forging process.

Therefore, the filter fixing part140is formed by punching a portion of the disk accommodating part110corresponding to a position at which the filter fixing part140will be formed and then vertically raising the portion of the disk accommodating part, such that the filter400may be fixed thereto.

The filter fixing part140may be formed by cutting another portion using a punch, or the like, except for the portion of the disk accommodating part bent upwardly and folded.

In addition, the filter fixing part140may have the same size and radius of curvature as the side wall part130in consideration of the height and the radius of curvature of the side wall part130in the case in which the filter fixing part140is folded and vertically raised.

Referring toFIG. 2B, after the primary base plate100is formed, a portion of the disk accommodating part110is punched and vertically raised to form the filter fixing part140, such that a secondary base plate100including the filter fixing part may be manufactured.

In the case in which the base plate100is manufactured using the pressing process or forging method, it may be difficult to implement a separate configuration for fixing the filter400, but the portion of the disk accommodating part110is punched and vertically raised to form the filter fixing part140, such that the filter fixing part140may be used for firmly fixing the filter400.

In addition, in order to improve pulling out force of the filter400, the seating groove150may be formed by the pressing process at a predetermined position of the disk accommodating part110on which the filter400is seated, and the filter400may be more firmly fixed by applying an adhesive to the seating groove150.

Further, the groove160may be formed in the side wall part130so that one side of the filter400is seated and supported.

That is, one side of the filter400is seated in the groove160formed in the side wall part130and supported by the groove160, and the other side thereof is supported by the filter fixing part140, such that the filter400may be firmly fixed to the base plate100.

Referring toFIG. 2C, the portion of the disk accommodating part110is punched and then vertically raised to form the filter fixing part140, such that a hole having a size corresponding to the filter fixing part140may be formed in the disk accommodating part110.

Since the hole needs to be sealed in order to improve performance of the hard disk drive according to the embodiment of the present invention, the hole may be sealed by a sealing member510.

That is, the sealing member510covering the hole may be coupled to the bottom surface of the base plate100, and a member such as tape, or the like, may be used therefor.

Therefore, the hole is sealed using the sealing member510, such that the base plate100is completed. As a result, the base plate100using the pressing process and forging method, including the filter fixing part140, and having reliability may be completed.

FIGS. 3A through 3Care schematic perspective views of a base plate provided in a hard disk drive according to another embodiment of the present invention.

Since a base plate100provided in the hard disk drive according to another embodiment of the present invention is the same as the base plate provided in the hard disk drive according to the embodiment of the present invention described with reference toFIGS. 1 through 2Cexcept that a filter fixing part140is configured of a first filter fixing part142and a second filter fixing part144, a description of other components except for the filter fixing part140will be omitted.

Referring toFIGS. 3A through 3C, the base plate100provided in the hard disk drive according to another embodiment of the present invention may include the first and second filter fixing parts142and144.

The first and second filter fixing parts142and144maybe formed by punching portions of a disk accommodating part110corresponding to positions at which the first and second filter fixing parts142and144will be formed and then vertically raising the portions of the disk accommodating part.

Further, the first and second filter fixing parts142and144may also be formed by cutting other portions of the disk accommodating part by using a puncher, or the like, except for the portions of the disk accommodating part bent upwardly and folded. In addition, the first and second filter fixing parts142and144may have the same size and radius of curvature as those of the side wall part130in consideration of the height and the radius of curvature of the side wall part130in the case in which the filter fixing parts142and144are folded and vertically raised.

One surface of a filter400collecting foreign objects from air flowing during rotation of a disk may be supported by the first filter fixing part142, and the other surface thereof may be supported by the second filter fixing part144.

That is, since at least two surfaces of the filter400may be supported by the first and second filter fixing parts142and144, the filter400may be more firmly fixed to the base plate100.

FIGS. 4A and 4Bare schematic perspective views of a base plate provided in a hard disk drive according to another embodiment of the present invention.

Referring toFIGS. 4A and 4B, a base plate100provided in a hard disk drive according to another embodiment of the present invention may include a filter fixing protrusion170for supporting a filter400.

Since the base plate100provided in the hard disk drive according to another embodiment of the present invention is the same as the base plate provided in the hard disk drive according to the embodiment of the present invention described with reference toFIGS. 1 through 2Cexcept that the filter fixing protrusion170is formed instead of forming the filter fixing part140in order to fix the filter400, a description of other components except for the filter fixing protrusion170will be omitted.

The filter fixing protrusion170may be formed by exerting pressure on a bottom surface of a disk accommodating part110in a predetermined position to allow the predetermined position to protrude and be formed in plural so as to firmly fix the filter400collecting foreign objects from air flowing during rotation of a disk500.

In the plurality of filter fixing protrusions170, a certain amount of protrusions may support one surface of the filter400, and the other protrusions may support the other surface of the filter400, such that the filter400may be fixed. In addition, a seating groove150is formed at a predetermined position of the disk accommodating part110on which the filter400is seated, and an adhesive is applied to the seating groove150, such that the filter400may be more firmly fixed.

Further, one side of the filter400is supported by a groove160formed in a side wall part130, such that the filter400may be firmly fixed to the base plate100.

Through the above-mentioned embodiments, the base plate100for a hard disk drive may be manufactured using the pressing process or forging method, and the base plate100in which defects of the pressing process or forging method are solved may be manufactured by punching the portion of the disk accommodating part110and vertically raising the portion of the disk accommodating part110to form the filter fixing part140or by exerting pressure on the bottom surface of the disk accommodating part110in a predetermined position to form the filter fixing protrusion170, in order to fix the filter400for collecting the foreign objects from air flowing during rotation of the disk500.

Further, the base plate100may be manufactured by the pressing process or forging process to significantly reduce the processing time and the energy consumption, whereby the production capability may be significantly improved.

As set forth above, with the base plate for a hard disk drive and the hard disk drive including the same according to the embodiments of the present invention, the filter may be firmly fixed even in the case of using the pressing process or forging process, whereby reliability of the hard disk drive may be improved.

In addition, since the base plate for a hard disk drive may be manufactured by the forging or pressing process to significantly reduce a processing time and energy consumption, whereby the production capability may be improved.