KR100505620B1 - Base frame of the hard disk drive - Google Patents

Abstract

The base frame of the hard disk drive according to the present invention is a base frame of a hard disk drive provided with a voice coil motor assembly having a yoke, wherein the yoke is formed with through holes at predetermined intervals at portions corresponding to each other. First and second threaded holes are formed in the portion of the body corresponding to the ball through which the through-holes are fastened, and a cylindrical boss portion through which the screw passes is formed on the first threaded hole. It is done.

Therefore, by improving the boss of the base frame where the voice coil motor is installed to a cylindrical shape without tabs, product defects caused by foreign substances caused by tap wear and tap wear of the screw holes due to unbalance of the assembly torque. It is advantageous in that it can reduce the time required and the work time.

Description

Base frame of the hard disk drive

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive used as an auxiliary storage device of a computer, and more particularly, to a base frame of a hard disk drive in which a boss of a base frame in which a voice coil motor is installed is improved.

In general, a hard disk drive (HDD), which is capable of recording / reproducing information by a user, is mainly used as an auxiliary storage device of a personal computer, and the storage capacity is rapidly increased due to recent advances in technology. On the other hand, the standard is becoming more and more compact.

1 is a schematic perspective view showing an open state of a cover frame of a conventional hard disk drive, and FIG. 2 is a schematic exploded perspective view showing an extract of the magnetic head actuator of FIG. 1.

Here, the same reference numerals in the drawings shown above indicate the same components.

1 and 2, a plurality of hard disks 110 are rotatably mounted to a spindle motor (not shown) installed in a base frame 100, and the magnetic head is mounted on the hard disk 110. (h) to protect the hard disk 110 and the magnetic head actuator 200 and the magnetic head actuator 200, which is rotated about the pivot shaft P, but not shown, while blocking the inflow of foreign substances. It is configured to include a cover frame (cover frame) coupled to the base frame 100 to. In addition, the spacer member 130b is interposed on the hub 111 to be firmly fixed to the upper surface of the top hard disk 110 so as to maintain a predetermined distance between the clamp disk 140 and the top hard disk 110. Reference numeral 120 denotes, for example, a circuit driver for signal transmission between a main circuit board (not shown) interfaced with a main body of a device such as a computer and the magnetic head h, and driving control of the magnetic head actuator 200.

The magnetic head actuator 200 is a head stack assembly (HSA), a swing arm (220) rotated about a pivot axis (P) by a voice coil motor (VCM) assembly, and the swing arm. The coil 231 positioned between the magnet (M in FIG. 2) to be described later to rotate 220 is configured to include a bobbin 230 wound up.

Here, the voice coil motor 210 is a driving motor that rotates the swing arm 220 to move the magnetic head h to a desired position on the hard disk 110. It is based on the principle that a force is generated when a current flows through a conductor in a continuum. The voice coil motor 210 assembly includes a lower yoke 211 having a pair of upright bosses 211a and 211b and a screw 212a that is complementarily coupled to the bosses 211a and 211b ( 212b) upper yoke 212 provided to face the lower yoke 211, through-holes 213a and 213b formed at predetermined intervals at mutually corresponding portions of the upper and lower yokes 211 and 212, and It has a pair of magnets (M in FIG. 2) provided in the lower yoke 211 and the upper yoke 212 so as to face each other. That is, the magnetic head actuator 200 is rotated by applying a force to the bobbin 230 by applying a current to the coil 231 positioned between the magnets M. As a result, the swing arm 220 branched to correspond to the bobbin 230 is rotated so that the track can be searched and accessed while flying in the radial direction on the hard disk 110 on which the magnetic head h supported at its end is rotated. And the accessed information is signal-processed by the circuit driver 120 to be recorded or output to, for example, a computer.

3 is a schematic perspective view illustrating the base frame of FIG. 1, and FIG. 4 is a cross-sectional view of the base frame of FIG. Here, the same reference numerals in the drawings shown above indicate the same components.

3 and 4, the base frame of the hard disk drive assembly having the configuration as described above generally includes a spindle motor 130, a hub 111 provided on the spindle motor 130, and the spindle motor ( And a base frame 100 supporting 130.

The spindle motor 130 installed in the base frame 100 is fixed to the base frame 100 by bolts 113, and a plurality of hard disks 110 are fixed to the hub 111.

Here, reference numeral 114 denotes a reinforcing rib for improving the mechanical strength of the hard disk drive base frame 100 by effectively suppressing deformation of the portion in which the spindle motor 130 is mounted.

The voice coil motor (VCM) 210 having a lower yoke 211 and an upper yoke 212 to which a pair of magnets (M in FIG. 2) are attached to face each other may pass through holes 213a and 213b formed in upper and lower yokes. The passed screws 212a and 212b are fastened and fixed to the first screw hole 241a and the second screw hole 242 of the base frame 100.

In addition, a boss 241 having a predetermined height protruding from the first screw hole 241a and having the same tap as the first screw hole 241a is formed above the first screw hole 241a. . The boss 241 serves to fix the voice coil motor 210. The boss 241 protruding in this way is coupled to the through hole 213a formed at one side of the voice coil motor 210. In addition, at one side of the second screw hole 242, when the voice coil motor 210 is assembled, the boss 241 coupled to the through hole 213a of the voice coil motor 210 is pivoted about an axis of the base frame 100. A locking portion 243 is installed to stop on the second screw hole 242.

However, referring to FIG. 4, the tab-shaped boss 241 as described above has a thread-shaped tap formed in the first screw hole 241a and is formed to be extended to the inside of the boss 241 so that the tab-shaped boss 241 is formed of the tab-shaped boss 241. It is different from the tap length of the two screw holes 242.

When the screws of the same size (M2 × 14) (212a, 212b in FIG. 3) are fastened to the first screw hole 241a and the second screw hole 242 with a torque of about 4.5 kg, Since the fastening areas of the screws 212a and 212b fastened to the screw holes 241a are relatively larger than the fastening areas of the screws 212a and 212b fastened to the second screw holes 242, the first screw holes 241a. The fastening force of the second screw hole 242 with respect to the fastening force of is biased toward the first screw hole 241a, resulting in an unbalance of the assembly torque.

Due to the imbalance of the assembly torque, foreign matters caused by tap wear and tap wear of the screw holes 241a and 242 are caused in the assembly process, causing assembly defects, and a long time is required.

The present invention has been made to solve the above problems, and an object thereof is to provide a base frame of a hard disk drive in which a tab-type boss of a base frame in which a voice coil motor is installed is improved.

In order to achieve the above object, a base frame of a hard disk drive according to the present invention is a base frame of a hard disk drive provided with a voice coil motor having a yoke, wherein the yoke is spaced at a portion corresponding to each other. A through hole is formed, and first and second screw holes are formed in the portion of the body corresponding to the through hole to fasten the screw passing through the through holes, and a cylindrical portion through which the screw passes is formed on the first screw hole. The boss portion is formed.

Therefore, by improving the boss of the base frame on which the voice coil motor is installed to a cylindrical shape without a tab, product defects caused by foreign substances caused by tap wear and tap wear of the screw holes due to unbalance of the assembly torque. It has the advantage of reducing the time required for work.

Hereinafter, a base frame of a hard disk drive according to the present invention will be described in detail with reference to the accompanying drawings.

5 is a schematic perspective view showing a base frame of a hard disk drive according to the present invention, Figure 6 is a cross-sectional view showing the main part according to the present invention shown in B 5B 'of FIG. Here, the same reference numerals in the drawings shown above indicate the same components.

Referring to FIG. 5, the structure of the hard disk drive according to the present invention is the same as in the related art.

The base frame 100 of the hard disk drive assembly according to the present invention generally includes a spindle motor 130, a hub 111 provided on the spindle motor 130, and the spindle motor 130. It includes a base frame 100 for supporting). The spindle motor 130 installed on the base frame 100 is fixed to the base frame 100 by bolts 113, and a plurality of hard disks 110 are fixed to the hub 111. The magnetic head actuator 200 includes a swing arm 220 which is rotated about a pivot axis P by a voice coil motor (VCM) 210 as a head stack assembly (HSA), and the swing arm. The coil 231 located between the voice coil motor 210 magnet (M of FIG. 2), which will be described later, so that the 220 is rotated, is configured to include a bobbin 230 wound up. The voice coil motor (VCM) assembly as described above has a lower yoke 211 having a pair of upright bosses 211a and 211b and a screw complementarily coupled to the bosses 211a and 211b. Through-holes 213a and 213b formed at predetermined intervals on the upper yoke 212 provided to face the lower yoke 211 and the corresponding portions of the upper and lower yokes 211 and 212 by (212a) and 212b. ) And a pair of magnets (M in FIG. 2) provided in the lower yoke 211 and the upper yoke 212 to face each other. That is, the magnetic head actuator 200 is rotated by applying a force to the bobbin 230 by applying a current to the coil 231 positioned between the magnets M.

The features of the hard disk drive base frame according to the invention will then be described in detail.

A voice coil having a lower yoke 211 and an upper yoke 212 to which a pair of magnets (M in FIG. 2) are attached to the base frame 100 of the hard disk drive so as to face each other on an upper surface of the base frame 100. The motor (VCM) 210 has a predetermined length inserted through a first screw hole 341a formed at one side of the base frame 100 and a second screw hole 242 formed at one side of the first screw hole 341a. Is fixed by screws 212a and 212b. In more detail, through holes 213a and 213b are formed in the upper and lower yokes 211 and 212 at predetermined intervals, and screws 212a and 212b passing through the through holes 213a and 213b are formed. The first screw hole (341a of FIG. 6) and the second screw hole 242 are fastened to the base frame 100. The upper part of the first screw hole 341a is formed with a cylindrical boss through which the screws 212a and 212b pass.

Here, the total lengths of the first screw hole 341a and the second screw hole 242 are preferably equal to each other.

Referring to FIG. 6, an upper portion of the first screw hole 341a extends from the first screw hole 341a to fix the voice coil motor 210 of FIG. 5 including upper and lower yokes 211 and 212. Unlike the conventional one, a cylindrical boss 341 having a predetermined height is not projected without thread tapping. The cylindrical boss 341 is preferably a straight hole having a predetermined diameter formed by drilling.

The cylindrical boss 341 is complementarily coupled to a through hole 213a formed at one side of the lower yoke 212 of the voice coil motor 210 of FIG. 5. At one side of the second screw hole 242, the cylindrical frame 341 coupled to the through hole 213a of the voice coil motor 210 when the voice coil motor 210 is assembled can be pivoted about an axis to the base frame 100. The engaging portion 243 is installed to stop on the second screw hole 242. As such, the boss 341 according to the present invention extends to the upper portion of the first screw hole 341a and is processed into a cylindrical shape, each of the first screw holes for coupling with the voice coil motor 210 of FIG. 341a) and tab lengths of the internal threads of the second screw hole 242 are equal to each other.

This is because when the screws (212a and 212b of FIG. 5) of the same size (M2 × 14) are fastened to the first screw hole 341a and the second screw hole 242, the first screw hole 341a and the second screw Since the tab lengths inside the thread hole 242 coincide with each other, the fastening area of the screw 212a fastened to the first screw hole 341a and the fastening area of the screw 212b fastened to the second screw hole 242 are reduced. Since the tightening force of the second screw hole 242 with respect to the tightening force of the first screw hole (341a) is the same as each other, the assembly torque for the first screw hole (341a) and the second screw hole 242 (torque) Will be balanced.

Due to the balance of the constant assembly torque, unlike the prior art, it is possible to prevent the defect of the product due to the generation of foreign matter, that is, particles (particles) due to the tap wear and tap wear of the screw holes (341a, 242), This has the advantage of reducing the time required for the work.

As described above, the base frame of the hard disk drive according to the present invention improves the boss of the base frame on which the voice coil motor is installed to a cylindrical shape without tabs, thereby resulting in unbalanced assembly torque. There is an advantage in that it is possible to reduce product defects caused by foreign matters caused by tap wear and tap wear of the cavities, and to shorten the work time.

1 is a schematic perspective view showing an open state of a cover frame of a conventional hard disk drive,

FIG. 2 is a schematic exploded perspective view showing the magnetic head actuator of FIG. 1;

3 is a schematic perspective view of the base frame of FIG. 1;

4 is a cross-sectional view of the cutting line AA ′ of FIG. 3;

5 is a schematic perspective view showing a base frame of a hard disk drive according to the present invention;

FIG. 6 is a cross-sectional view illustrating main parts of the present invention, shown by cutting out BB ′ of FIG. 5.

<Description of the symbols for the main parts of the drawings>

100 ... base frame 110 ... hard disk

111 ... Herbs

113,140b ... Bolt 114 ... Reinforced rib

120 ... circuit driver 130 ... spindle motor

130b ... Spacer member 140 ... Clamp disc

140a ... fastener 200 ... magnetic head actuator

210 Boy coil motor 211 Lower yoke

212 Upper York 213a, 213b ... Through-through

220 ... swing arm 230 ... bobbin

231 ... coil 241 ... tapped boss

241a, 341a ... 1st thread 242 ... 2nd thread

341 ... cylindrical boss

Claims (1)

A base frame of a hard disk drive provided with a voice coil motor assembly having a yoke, The yoke is provided with through holes at predetermined intervals at portions corresponding to each other, and first and second screw holes for fastening screws passing through the through holes are formed at portions of the body corresponding to the through holes. The base frame of the hard disk drive, characterized in that a cylindrical boss portion through which the screw passes is formed at an upper portion of the screw hole.