JP3012333U - Hard disk drive wiring structure - Google Patents

Abstract

(57) [Abstract] [Objective] The flexible printed circuit that connects the actuator and the printed circuit board is improved to suppress the noise of the head signal and suppress the bias force. [Configuration] An actuator 4 rotatably supported,
Regarding a wiring structure of a hard disk drive including a printed circuit board 11 that processes a head signal of the magnetic head 5 and a motor current of a voice coil motor, a flexible printed circuit 12 for a head signal and a flexible printed circuit for a motor current are provided. Wiring is performed with the characteristic printed circuit 13. In addition, the flexible printed circuit 12 is bent and connected to the magnetic head side and the other flexible printed circuit 13 is bent and connected to the voice coil motor side with the shaft 3 of the actuator interposed therebetween. Since the flexible printed circuit can be dedicated for the motor current and the head signal, there is no fear of signal interference. Further, the flexible printed circuits 12 and 13 that are divided into two lines apply bias forces that cancel each other to the actuator 4, so that the bias force that affects the movement of the magnetic head is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hard disk drive (HDD), and more particularly, to a flexible printed circuit (FPC) for wiring between an actuator and a printed circuit board.

[0002]

[Prior art]

 Generally, an HDD used as an auxiliary storage device for a computer or the like is for writing / reading data to / from a disk 2 which rotates at a high speed by a spindle motor 1 and a track of the disk 2, as shown in FIG. And an actuator 4 to which the magnetic head 5 is attached. The actuator 4 is rotatably supported by the shaft 3, and the bobbin 8 and the voice coil motor installed on one end of the actuator 4 cause the magnetic head 5 installed on the other end to move on the disk 2. To write / read data to / from the track of the disk 2.

The magnetic head 5 is mounted via a head gimbal 6 (HEAD GIMBAL), and when it moves on the disk 2, it slightly floats due to the surface air current generated by the high speed rotation of the disk 2 and produces a fine gap. Keep and move. Further, when the HDD is stopped or powered off, the magnetic head 5 is moved to a parking zone provided inside the track portion of the disk 2 and stopped. This is to prevent beforehand the accident that the magnetic head 5 comes into contact with the data surface of the disk 2 and damages the written data.

In the conventional HDD operating as described above, as shown in FIGS. 4 and 5, the signal cable 9 for transmitting the signal of the magnetic head 5 and the current terminal 10 of the voice coil motor are connected to the terminals of the printed circuit board 11. A single flexible printed circuit 20 incorporating wiring features is used to connect to 11a.

However, since there is only one flexible printed circuit 20, the wiring pattern is overcrowded, and the current path pattern 20b of the voice coil motor and the signal path pattern 20a of the magnetic head are close to each other with the ground pattern 20c in between. Therefore, noise is likely to occur due to interference of the head signal by the motor current of the voice coil motor, which has a relatively large value. Further, when the magnetic head 5 is moved, the flexible printed circuit 20 applies a biasing force to the actuator 4 in one direction. Therefore, when searching the track of the magnetic head 5, the current is adjusted in consideration of it. Must. Therefore, the position control capability of the magnetic head 5 is reduced. Nowadays, as the capacity is increased and miniaturization is advanced, these improvements are desired.

[0006]

[Problems to be solved by the device]

 Therefore, the object of the present invention is to improve the flexible printed circuit that connects the actuator and the printed circuit board with respect to the above wiring structure of the actuator, suppress the noise of the head signal, and minimize the bias force. The aim is to be suppressed.

[0007]

[Means for Solving the Problems]

 In the present invention, a flexible printed circuit having a signal path pattern for a head signal and a flexible printed circuit having a current path pattern for a motor current are provided. And a printed circuit. Alternatively, it is characterized in that two flexible printed circuits are provided, and the two flexible printed circuits are connected so as to apply a biasing force to the actuator in directions that cancel each other out. As a specific structure for applying the canceling bias forces as described above, one flexible printed circuit is bent and connected to the magnetic head side with the shaft of the actuator interposed, and the other side is connected to the voice coil motor side. The flexible printed circuit is bent and connected.

[0008]

[Action]

 According to the structure of the present invention, since the flexible printed circuit can be used exclusively for the motor current and the head signal, there is no fear of interference. Further, since the flexible printed circuit divided into two lines applies a biasing force to the actuator to cancel each other, the biasing force which affects the movement of the magnetic head is greatly reduced.

[0009]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. In the figure, the same reference numerals are used for the same parts as the conventional ones.

The signal cable 9 of the magnetic head 5 attached to the actuator 4 via the head gimbal 6 is connected to the printed circuit board 11 by the flexible printed circuit 12 in which the signal path pattern 12a is formed. The current terminal 10 of the voice coil motor is connected to the printed circuit board 11 by the flexible printed circuit 13 having the current path pattern 13a and the ground pattern 13b.

The flexible printed circuits 12 and 13 are extended from the printed circuit board 11 in a symmetrical direction as shown in FIG. 2, and apply a biasing force to the actuator 4 in a canceling direction. To be connected. That is, as shown in FIG. 1, the flexible printed circuit 12 is connected to the magnetic head 5 side by bending the magnetic head 5 so as to form a semicircle with the axis 3 as a boundary, and the bobbin 8 side. The flexible printed circuit 13 is bent in a semi-circular shape to connect the flexible printed circuit 13 to the bobbin 8 side by an opposing semi-circular shape, or as shown in FIG. After crossing the tip side (actuator 4 side), the flexible printed circuit 13 is connected to the bobbin 8 side by bending the magnetic head 5 so as to make a semicircular shape, and the bobbin 8 makes a semicircular shape. The flexible printed circuit 12 can be connected in a cross-shaped semi-circular shape so that the flexible printed circuit 12 is connected to the magnetic head 5 side. However, it is needless to say that in the case of providing as shown in FIG. 3, the flexible printed circuits 12 and 13 need to be offset from each other.

The flexible printed circuit 12 connected to the signal cable 9 of the magnetic head 5 is dedicated to have only the signal path pattern 12a formed therein, and is flexible to be connected to the current terminal 10 of the voice coil motor. Since only the current path pattern 13a and the ground pattern 13b are formed in the sexual printed circuit 13, there is no fear that the motor current interferes with the head signal to generate noise.

Further, as shown in FIGS. 1 and 3, the flexible printed circuits 12 and 13 are bent symmetrically with respect to the axis 3 and are connected to each other, so that the actuator is moved when the magnetic head 5 is moved. Since the bias forces in the two directions are generated so as to cancel each other across the shaft 3 with respect to the motor 4, the influence of the bias force on the head movement is suppressed as much as possible. At this time, the offsetting effect can be adjusted according to the lengths of the two flexible printed circuits 12 and 13 and the connection position to the actuator 4. In addition, since the size of each of the flexible printed circuits 12 and 13 divided into two is reduced to about half of the conventional size, the value of the generated bias force is considerably reduced.

[0014]

[Effect of device]

 As described above, according to the present invention, the flexible printed circuit is divided into two, one dedicated to the motor current and the other dedicated to the head signal, so that the influence of the voice coil motor current on the head signal is eliminated, and the head signal is eliminated. The signal is very stable. Also, by connecting the two flexible printed circuits so as to apply a biasing force to the actuator in the directions that cancel each other out, the magnetic head can be moved more smoothly and more accurately. Track search and write / read can be performed.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a hard disk drive showing an embodiment of a wiring structure according to the present invention.

FIG. 2 is an explanatory view showing an example of a flexible printed circuit according to the present invention.

FIG. 3 is a schematic plan view of a hard disk drive showing another embodiment of the wiring structure according to the present invention.

FIG. 4 is a schematic plan view of a hard disk drive showing a conventional wiring structure.

FIG. 5 is an explanatory view showing a conventional flexible printed circuit.

[Explanation of symbols]

 4 actuator 5 magnetic head 9 signal cable 10 current terminal 11 printed circuit board 12, 13 flexible printed circuit 12a signal path pattern 13a current path pattern 13b ground pattern

Claims (5)

[Scope of utility model registration request] 1. A voice coil motor on one end side, a magnetic head on the other end side, a rotatably supported actuator, and a printed circuit for processing a head signal of the magnetic head and a motor current of the voice coil motor. A flexible printed circuit having a signal path pattern for a head signal and a flexible printed circuit having a current path pattern for a motor current in a wiring structure of a hard disk drive including a substrate; Wiring structure characterized in that wiring between the magnetic head and the voice coil motor and the printed circuit board is performed by the flexible printed circuit. 2. The wiring structure according to claim 1, wherein the two flexible printed circuits are provided so as to apply a biasing force to the actuator in directions that cancel each other out. 3. A voice coil motor on one end side, a magnetic head on the other end side, an actuator rotatably supported, and a printed circuit for processing a head signal of the magnetic head and a motor current of the voice coil motor. A substrate,
In a wiring structure of a hard disk drive in which a flexible printed circuit is wired between a magnetic head and a voice coil motor and a printed circuit board, two flexible printed circuits are provided, and the two flexible printed circuits are provided. Wiring structure, in which a flexible printed circuit is connected to the actuator so as to apply a biasing force in a mutually canceling direction. 4. The flexible printed circuit is flexibly connected to the magnetic head side and the flexible printed circuit is flexibly connected to the voice coil motor side with the shaft of the actuator interposed therebetween. 3. The wiring structure described in 3. 5. A signal path pattern for a head signal is formed on one of the two flexible printed circuits, and a current path pattern for a motor current is formed on the other.
The wiring structure shown.