KR20000006621U - Encoder of Spindle Motor for Hard Disk Drive Tester - Google Patents

Abstract

An encoder of a spindle motor for a hard disk drive tester is disclosed. The encoder of the spindle motor for a hard disk drive tester disclosed is installed to be rotatable and detachable on a rotation shaft of the spindle motor, and a sensor part is provided at one side thereof, and the spindle motor for the hard disk drive tester constantly adjusts the rotation speed of the spindle motor. An encoder comprising: first and second transparent members having through holes of a predetermined diameter; And a third transparent member of a thin plate bonded to the first and second transparent members and having scale portions formed on the surface thereof at predetermined intervals to provide a predetermined signal to the sensor unit.

Therefore, the spindle motor of the tester for a hard disk drive according to the present invention is improved by the structure of the encoder for adjusting the rotational speed, it is possible to accurately perform the rotational speed adjustment of the spindle motor, and to extend the life of the encoder There are advantages to that.

Description

Encoder of Spindle Motor for Hard Disk Drive Tester

The present invention relates to a spindle motor of a hard disk drive tester, which is a device for measuring electrical characteristics of a head stack assembly of a hard disk drive, and in particular, a hard disk drive tester whose structure is improved to constantly adjust the rotation speed of the spindle motor. For an encoder of a spindle motor.

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 perspective view showing main parts of a magnetic head actuator in FIG. 1.

1, the magnetic disk 110 is rotatably mounted to a spindle motor (not shown) installed in the base frame 100. In order to float the magnetic head h on the disk 110, a magnetic head actuator 200 which is driven to rotate about the pivot axis P is installed. Although not shown, a cover frame coupled to the base frame 100 is provided to protect the disk 110 and the magnetic head actuator 200 and block foreign material from entering. Reference numeral 120 denotes, for example, a circuit driver for signal transmission between a main circuit board (not shown) interfaced with a device body such as a computer and the magnetic head h, and driving control of the magnetic head actuator 200. Referring to FIG. 2, the magnetic head actuator 200 has a lower yoke 211 having a pair of upright bosses 211a and 211b and a pin complementarily coupled to the bosses 211a and 211b. The upper yoke 212 is installed to face the lower yoke 211 by 212a and 212b. A voice coil motor (VCM) 210 having a pair of magnets 211m and 212m provided in the lower yoke 211 and the upper yoke 212 to face each other is installed. Then, as a head stack assembly (HSA), a swing arm 220 is pivoted around the pivot axis P by the voice coil motor 210. Suspension 221 supported by the swing arm 220 and the magnetic head (h) is installed at the distal end, and branched to correspond to the swing arm 220 is located between the magnet (211m) (212m) coil 231 includes a wound bobbin 230. 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 disk. It is to use the principle that the force is generated when the flow through, by applying a current to the coil 231 located between the magnet (211m) (212) by applying a force to the bobbin 230 is rotated. Thus, the swing arm 220 branched to correspond to the bobbin 230 is rotated so that the track can be accessed by flying in the radial direction on the magnetic 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 cross-sectional view showing a tester for a conventional hard disk drive.

Referring to FIG. 3, the magnetic head h of the head stack assembly as described above moves in a radial direction on a rotating magnetic disk 11 to search for and access a track, and access the information to the circuit driver. A hard disk drive tester is shown, which is a device that measures the electrical characteristics of the head stack assembly so that it can be signaled and recorded or output to a computer.

A tester of a conventional hard disk drive is installed on a bed 312 and one side of the bed 312, the spindle motor (not shown) to which the magnetic disk 311 is coupled to the rotating shaft 313 to be rotatable at a constant speed. Is installed. One side of the magnetic disk 311 is provided with a carriage 314 so that the head stack assembly (HSA) 317a, which will be described later, is moved in the radial direction of the magnetic disk 311, and above the carriage 314. A board portion 316 having a carriage adjuster 319 to which the head stack assembly 317a is coupled is provided. Such a conventional hard disk drive tester searches for and accesses a track while flying in a radial direction on the magnetic disk 110 in which the magnetic head h supported at the end of the head stack assembly 317a is rotated at a constant speed. To measure the electrical properties of the head stack assembly 317a. Here, the not shown spindle motor is shown in FIG. 4.

Referring to FIG. 4, a plurality of magnetic disks 311 are rotatably installed on the body of the spindle motor 323, that is, the upper rotation shaft 313 in the housing 313a. An encoder which extends to the upper rotary shaft 313 and which is rotatable and detachable and is provided with a sensor unit (not shown) on one side thereof to constantly adjust the rotational speed and the rotational speed of the spindle motor 323 ( 315 is installed on the lower rotary shaft 313.

Referring to FIG. 5, the encoder 315 as described above is a transparent member 315a made of a glass material and a scale portion 315b printed in a straight line so as to be kept at a predetermined interval from each other in the direction of the center of rotation on the transparent member 315a. And, formed on one side of the encoder 315 is provided with a sensor unit 315c for constantly adjusting the rotational speed and rotational speed of the spindle motor 323.

The encoder 315 is coupled to the rotating shaft 313 of the spindle motor 323 to rotate, the interval change of the scale unit 315b according to the rotational speed, and to the sensor unit 315c by adjusting the change The rotation speed and the rotation speed of the spindle motor 323 are controlled by a predetermined signal transmission. That is, the faster the rotational speed is, the narrower the interval of each scale part 315b is, and the slower the rotational speed, the more the interval of each scale part 315b is relatively wider than when the rotational speed is fast. This is provided as a predetermined signal to the sensor unit 315c provided on one side of the encoder 315, so that the rotational speed and rotational speed of the spindle motor 323 is constantly adjusted.

However, since the encoder 315 rotates at a rotational speed of about 4500 to 5400 RPM, when used for a long time, contaminants come into contact with the surface of the rotating encoder 315. Then, friction with contaminants is generated by its high speed rotation speed, so that the scale portion 315b printed on the surface of the transparent member 315a is erased to constantly adjust the rotation speed and rotation speed of the spindle motor 323. It becomes impossible. As a result, the work efficiency of the hard disk drive tester is reduced, and the life of the encoder 315 is shortened.

An object of the present invention is to provide an encoder of a spindle motor for a hard disk drive tester having an improved structure of an encoder for adjusting a rotational speed of a spindle motor.

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

Figure 2 is a schematic perspective view showing the main portion of the magnetic head actuator in Figure 1,

3 is a schematic perspective view showing a tester for a conventional hard disk drive,

4 is a schematic cross-sectional view showing the spindle motor of FIG. 3,

FIG. 5 is a schematic perspective view illustrating the encoder of FIG. 4;

6 is a schematic cross-sectional view showing a spindle motor of the hard disk drive tester according to the present invention,

7 is a schematic perspective view illustrating the encoder of FIG. 6.

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

100 ... base frame 110,311 ... magnetic disk

200 ... magnetic head actuator 210 ... boy coil motor

211 Lower York 212 Upper York

220 swing arm 221 suspension

230 ... bobbin 231 ... coil

M ... magnet 312 ... bed

Spindle motor shaft 313a Spindle motor housing

314 ... carriage 315,425 ... encoder

315a ... transparent member 315b, 427 scale part

315c ... Sensor section 323,423 ... Spindle motor

316 ... Board section 317a, 317b ... Head stack assembly (HSA)

319 Carriage adjustment part 425a ... 1st transparent member

425b ... the second transparent member 426 ... the third transparent member

In order to achieve the above object, the encoder of the spindle motor for a hard disk drive tester according to the present invention is installed to be rotatable and detachable on a rotating shaft of the spindle motor, and a sensor part is provided at one side thereof to increase the rotational speed of the spindle motor. In the encoder of the spindle motor for the hard disk drive tester which adjusts uniformly,

First and second transparent members having through holes of a predetermined diameter; And a third transparent member of a thin plate bonded to the first and second transparent members and having scale portions formed on the surface thereof at predetermined intervals to provide a predetermined signal to the sensor unit.

According to the present invention, the third transparent member is preferably made of a film material.

Therefore, the encoder of the spindle motor for a hard disk drive tester according to the present invention is improved in the structure of the encoder for adjusting the rotational speed, it is possible to accurately perform the rotational speed and rotational speed of the spindle motor, and extend the life of the encoder There are advantages to doing it.

Hereinafter, an encoder of a spindle motor for a hard disk drive tester according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 6 is a schematic cross-sectional view showing a spindle motor of the hard disk drive tester according to the present invention, Figure 7 is a schematic perspective view showing the encoder of FIG. Here, the same reference numerals in the drawings shown above indicate the same components.

Referring to Figure 6, the spindle motor 423 of the hard disk drive tester, which is provided for testing the electrical properties of the head stack assembly for the hard disk drive, is located on top of the rotating shaft 313 installed in the housing 313a of the body. Magnetic disk 311 is rotatably installed. In addition, the encoder 425 is installed to be detachably fixed to the lower rotating shaft 313 to which the magnetic disk 311 is coupled to the corresponding lower rotating shaft 313 through its through hole.

Referring to FIG. 7, the encoder 425 as described above is detachably fixed to the lower rotating shaft 313 and rotates so that the first and second transparent members having a predetermined thickness having through-holes having a predetermined diameter in the center thereof ( 425a, 425b. A thin third transparent member 426 of a film material is provided between the first and second transparent members 425a and 425b so as to be adhered to the first and second transparent members 425a and 425b. In addition, a sensor unit 315c is installed at one side of the encoder 425 so that the rotation speed and the rotation speed of the spindle motor can be constantly adjusted by a predetermined signal of the scale unit 427 which will be described later. The shape of the third transparent member 426 is the same as that of the first and second transparent members 425a and 425b. In addition, it is formed on the surface of the third transparent member 426 at a predetermined interval from each other, and transmitted to the sensor unit 315c to provide a schedule for providing a predetermined signal for constantly adjusting the rotational speed and rotational speed of the spindle motor A portion 427, that is, a scale is printed in a straight line in the direction of the center of rotation of the third transparent member 426.

The encoder 425 as described above is coupled to the lower rotation shaft 313 of the spindle motor 423 to rotate, the scale portion 427 formed on the upper surface of the third transparent member 426 of a thin film made of a spindle The interval varies depending on the rotational speed and the rotational speed of the motor 423. That is, the faster the rotational speed is, the narrower the scale portion 427 becomes, and the slower the rotational speed becomes, the wider the interval between the scale portions 427 is, the relatively wider than when the rotational speed is high. As such, a predetermined signal according to the adjustment of the change in the interval of the scale unit 427 with respect to the rotational speed is provided and transmitted to the sensor unit 315c installed at one side of the encoder 425, thereby rotating the already programmed spindle motor 423. The number and rotation speed can be adjusted constantly. Here, the first and second transparent members 425a and 425b serve to protect the scale 427 formed on the surface of the third transparent member 426 from contaminants. That is, when the encoder 425 is rotated at a high speed of 4500 to 5400 RPM for a long time by the spindle motor, the contaminants touch the surface of the encoder 425, and the contaminants are separated from the scale 427 by the rotational speed thereof. Friction is to prevent the printed scale portion 427 is erased from each other.

More specifically, the encoder 425 of the spindle motor for a hard disk drive tester according to the present invention, unlike the prior art, the sensor unit 315c by a predetermined signal to control the rotational speed and the rotational speed of the spindle motor constant The third transparent member 426 of the film material is adhered to the glass first and second transparent members 425a and 425b to protect the scale part 427 provided by the contaminants during the high speed rotation of the encoder 425. By preventing the scale portion 427 printed on the surface from being erased, it is possible to constantly adjust the rotation speed and the rotation speed of the spindle motor. Accordingly, the work efficiency of the hard disk drive tester is improved, and the life of the encoder 425 can be extended.

As described above, the spindle motor of the tester for a hard disk drive according to the present invention is improved by the structure of the encoder for adjusting the rotational speed, it is possible to accurately perform the rotational speed adjustment of the spindle motor, the life of the encoder The advantage is that it can be extended.

Claims (2)

In the encoder of the spindle motor for a hard disk drive tester which is installed on the rotating shaft of the spindle motor so as to be detachable, the sensor unit is provided on one side thereof to constantly adjust the rotational speed of the spindle motor. First and second transparent members having through holes of a predetermined diameter; And And a third transparent member made of a thin plate which is adhered between the first and second transparent members and has scale portions formed on the surface thereof at regular intervals to provide a predetermined signal to the sensor unit. Encoder of spindle motor for drive tester. The method of claim 1, The third transparent member is an encoder of the spindle motor for a hard disk drive tester, characterized in that made of a film material.