KR200244057Y1 - F.C Structure of Hard Disk Drive - Google Patents

Abstract

The present invention relates to an FPC structure of a hard disk drive, and in particular, an actuator having a head for reading and reading information on a disk, a VCM formed at a rear end of the actuator to drive the actuator, and controlling the head and the actuator. In the FPC structure of a hard disk drive equipped with a PCBA, patterned on the FPC, the head signal line for electrically connecting the PCBA and the head of the actuator, and is provided outside the FPC, the PCBA and the VCM It relates to an FPC structure of a hard disk drive, characterized in that it comprises a VCM signal line electrically connected.

Description

FPC Structure of Hard Disk Drive

1 is a schematic diagram showing an FPC of a conventional hard disk drive,

2 is a perspective view showing a state in which the FPC of FIG. 1 is mounted on the actuator;

3 is a schematic view showing an FPC according to an embodiment of the present invention,

4 is a perspective view schematically showing a state in which the FPC of FIG. 3 is mounted to an actuator.

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

1: FPC (Flexible Printed Circuit) 2: Head Signal Line Pattern

3: VCM signal line pattern 4: Head wire soldering terminal

5: VCM wire soldering terminal 6: holder

7: Bracket 8: Preamplifier IC

9 connector 10 actuator

11: head gimbal 12: head

13: pivot axis 14: suspension

15: head wire 20: VCM (Voice Coil Moter)

21: bobbin 22: VCM coil wire

23: VCM wire 30: pattern

31: VCM signal line 40: soldering terminal

The present invention relates to a flexible printed circuit (FPC) structure of a hard disk drive. In particular, a hard disk drive in which a signal coil of a voice coil motor (VCM) is installed outside the FPC. Relates to the FPC structure.

In general, an FPC of a hard disk drive refers to a means for electrically connecting a head and a VCM in a printed circuit board assembly (PCBA) and a head disk assembly (HDA), and the signal line on the FPC 1 is a first line. As shown in FIG. 1, a head signal line pattern 2 for transmitting a head signal and a VCM signal line pattern 2 for transmitting a control signal to the VCM are formed.

As shown in FIGS. 1 and 2, the FPC 1 has a bracket 7 fixed to the base (not shown) of the HDD at one end thereof and fixed to the actuator 10 at the other end thereof. The holder 6 is formed, and the soldering terminal 5 connected to the VCM signal line pattern 3 is formed by soldering the VCM wires 23 to the holder 6, and the FPC 1 extending from the holder 6. At the other end of the head), the head wire 15 is soldered to form a solder terminal 4 connected to the head signal line pattern 2.

In addition, the bracket 7 includes a connector 9 connected to a PCBA (not shown), and a preamplifier IC 8 connected to the head signal line pattern 2 between the holder 6 and the soldering terminal 4. Is installed to amplify and transmit the signal read out from the head (12).

In this configuration, the data read from the head 12 is detected by the head 12 attached to the bottom of the head gimbal 11, and the detected signal passes through the head wire tube 15A on the head wire 15. Amplified by the preamplifier IC at the head wire soldering terminal 4, and then connected to the PCBA, which is an assembly of circuits outside the HDA, via the FPC connector 9 via the head signal pattern 2 on the FPC. The path of the (READ) signal is formed.

In addition, when looking at the VCM 20 control current path, windings densely formed inside the bobbin 21, that is, both ends of the VCM coil wire 22 are connected to the VCM wire solder terminal on the FPC through the VCM wire 23 ( 5) After soldering, take the VCM signal line pattern (3) on the FPC (1) and connect it to the corresponding pin of the FPC connector (9) and the VCM control circuit part on the PCBA outside the HDA to connect the servo system firmware (Firmware) and The control current on the VCM signal line generated by the hardware passes to the VCM.

However, the VCM signal has a large signal amplitude and current at several hundred millivolts, and the signal change is large and abrupt according to the VCM operation, whereas the read back signal of the head is a type in which the preamp IC is disposed on the bracket of the FPC. Even in the type where dozens of micro volts and preamp ICs are placed in the FPC holder, the signal difference between the VCM and the head is about 40 to 40000 times, since the signal difference between the VCM and the head is about 40 volts. The quality is deteriorated, which in turn causes an error in the read operation of the head, resulting in a decrease in the read performance of the head.

In order to solve this problem, the gap between the head signal line pattern and the VCM signal line pattern on the FPC is maximized or the ground pattern is inserted to reduce the interference effect. However, this method can effectively reduce the noise. Not only is there a wider range of FPC, it is difficult to cope with the trend of higher capacity, smaller size and thinner HDD.

It is therefore an object of the present invention to provide an FPC structure of a hard disk drive in which the VCM signal line is disposed outside the FPC to remove noise from the head signal line on the FPC to improve the read performance of the head.

Another object of the present invention is to minimize the FPC width and to reduce the external force caused by the FPC when operating the actuator to stabilize the servo function, and to provide the FPC structure of the hard disk drive that contributes to the miniaturization and thinning according to the trend of high capacity of the HDD. It is in doing it.

An object of the present invention described above is provided with an actuator having a head for reading / writing information on a disk, a VCM formed at a rear end of the actuator to drive the actuator, and a PCBA for controlling the head and the actuator. In the FPC structure of a hard disk drive, a patterned on the FPC, a head signal line for electrically connecting the head of the PCBA and the actuator, and a VCM installed outside the FPC, and electrically connecting the PCBA and the VCM. It is achieved by providing an FPC structure of a hard disk drive characterized in that it is provided with a signal line.

According to a preferred feature of the present invention, the signal line of the VCM, one end is connected to the coil wire of the VCM, the other end is connected to the connecting means formed on the bracket of the FPC.

Preferably, the connection means, the VCM signal line pattern connected to the connector on the bracket, and formed at the end of the VCM signal line pattern, and is configured to have a soldering terminal connected to the VCM signal line.

Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

Prior to describing the present embodiment, the same reference numerals are used to refer to the same elements as those of the prior art described with reference to FIGS. 1 and 2, and detailed descriptions thereof will not be repeated.

As shown in FIG. 4, the FPC structure of the hard disk drive according to the present embodiment includes an actuator 10 having a head 12 for reading and writing information onto a disc, and a rear end of the actuator 10. As shown in FIG. It is applied to a hard disk drive provided with a VCM 20 formed in the drive unit 10, and the PCBA for controlling the head 12 and the VCM 20.

The FPC structure of the hard disk drive according to the present embodiment, as shown in FIG. 3, is patterned on the FPC 1, and the head signal line 2 electrically connecting the PCBA and the head 12 of the actuator 10 to each other. And a VCM signal line 31 which is installed outside the FPC 1 and electrically connects the PCBA and the VCM 20.

The signal line 31 of the above-described VCM, one end is connected to the VCM coil wire 22, the other end is connected to the connecting means formed in the bracket 7 of the FPC.

In addition, the above-described connection means is formed at the end of the VCM signal line pattern 30 and the VCM signal line pattern 30 connected to the connector 9 to the bracket 7, and is connected to the coil wire 22 of the VCM. The terminal 40 is comprised.

Hereinafter, the operation and effects of the present embodiment configured as described above will be described.

The VCM signal wire 31 connected to one end of the VCM coil wire 22 provided at the rear end of the actuator 10 is connected to the VCM wire solder terminal 40 installed at the bracket 7 of the FPC, as shown in FIG. Is soldered into and connected. Therefore, the length of the VCM signal line 31 should be set slightly longer so that the actuator 10 can move freely within the angle set about the pivot axis 13, but the actual length of the VCM signal line 31 is VCM 20. Is shorter than the previous full length connected to the connector 9 of the bracket via the FPC (1).

Therefore, the VCM control current supplied from the PCBA is directly transmitted to the VCM 20 through the connector 9, the pattern 30 formed in the bracket, the solder terminal 40 and the signal line 31, and the head is connected to the FPC 1. Only the signal line pattern 2 is formed so that the thickness of the FPC becomes thin. Accordingly, as the force to straighten the arc portion of the FPC becomes smaller, the control of the actuator 1 is improved and the servo control becomes easier.

As described above, according to the FPC structure of the hard disk drive according to the present invention, by connecting the VCM signal line to the connector directly from the VCM to the connector to pattern only the head signal line on the FPC, a relatively large current and signal change of the VCM By eliminating the interference of the head signal current generated by the signal current to improve the performance of the equipment, by reducing the thickness of the FPC, there is an effect that contributes to the stabilization of the servo function, miniaturization and thinning of the equipment.

Claims (3)

In the FPC structure of the hard disk drive provided with an actuator having a head for reading and writing information to a disk, a VCM formed at a rear end of the actuator to drive the actuator, and a PCBA for controlling the head and the actuator. A head signal line patterned on the FPC and electrically connecting the PCBA and the head of the actuator; And a VCM signal line installed outside the FPC and electrically connecting the PCBA and the VCM. The FPC structure of a hard disk drive according to claim 1, wherein the signal line of the VCM has one end connected to a coil wire of the VCM, and the other end connected to a connecting means formed on a bracket of the FPC. According to claim 2, The connecting means, VCM signal line pattern connected to the connector to the bracket; And a soldering terminal formed at an end of the VCM signal line pattern, the solder terminal being connected to the VCM signal line.