KR100205287B1 - Detecting device and method for the actuator unlatching in a hard disk driver - Google Patents

Abstract

1. Technical field to which the invention described in the claims belongs

The present invention relates to an apparatus and method for detecting an actuator unlatching of a hard disk drive.

2. Technical problem to be solved by invention

The present invention provides an unlatch detection device and method for detecting an unlatch of an actuator in a hard disk drive using a magnet latch method and preventing collision between an outer crash stopper and an iron plate of an actuator.

3. Summary of Solution to Invention

In the latching detection device of a magnet latch type hard disk drive having a head having a head for recording or reproducing data at one end and having an actuator with an iron piece attached to the magnet at the other end, the magnet is attached to the magnet and attached to the hard. A latch iron piece in contact with the iron piece when the disk drive is not in use, an unlatch detecting means for outputting an unlatch detection signal in response to the iron piece being latched, and the actuator in response to receiving the unlatch detection signal. Characterized in that the control means for blocking the driving current being applied to.

4. Important uses of the invention

It can be used to detect the actuator latching of the hard disk drive.

Description

Actuator unlatch detection device and method for a hard disk drive.

1 is a plan view of a conventional hard disk drive using a magnet latch method.

2 is a connection state diagram of an unlatch detection apparatus and a head disk assembly (HDA) according to an embodiment of the present invention.

3 is a control flow diagram of the CPU 22 according to an embodiment of the present invention.

4 is a timing diagram according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

2: disc 4: head

6: Actuator 8: Pivot Bearing

10: VCM (Voice Coil Motor) 12: Iron piece

14: Outer Crash Stopper

16: magnet latch 18: latch iron

The present invention relates to an actuator latch method of a hard disk drive, and more particularly, to an apparatus and method for detecting an actuator unlatching of a hard disk drive using a magnet latch method.

A magnetic disk drive (such as a hard disk drive) is a device for magnetically recording data on a rotating magnetic disk or reproducing data recorded on a magnetic disk, and can access a large amount of data at high speed. Because of this, it is widely used as an auxiliary memory device of a computer system. A disk of the magnetic disk drive apparatus can be generally divided into a data area and a parking area. The data area includes a servo information section for controlling head position and speed, a data section in which actual data is recorded, and a maintenance section in which information such as a defect on a disk is recorded. On the other hand, the parking area is an area where the head is located when the driving power of the magnetic disk drive device is turned off, and is usually located inside the magnetic disk.

In general, the magnetic disk driving device automatically parks the head located in the data area in the parking area when the driving power is turned off to prevent damage to the head and the magnetic disk. At this time, if vibration or shock is applied from the outside, the head is pushed into the data area in contact with the magnetic disk. Therefore, a hard defect occurs on the magnetic disk, which causes data loss and head damage. In order to solve this problem, a hard disk drive, which is a magnetic disk drive device, typically uses one of a magnet latch method, a solenoid latch method, and an air flow latch method. Hereinafter, a magnet latch method widely used in a hard disk drive will be described with reference to FIG. 1.

1 is a plan view of a hard disk drive using a magnet latch method. In FIG. 1, the disc 2 records data transmitted from the host computer in a magnetic form and rotates at a constant speed by the spindle motor. When the disk 2 rotates at a constant speed, the head 4 rises to a certain height on the disk 2 to record or reproduce data, and is attached to one end of the actuator 6. The actuator 6 having the head 4 attached to one end and the iron piece 12 attached to the magnet on the other end is supported by the pivot bearing 8. The actuator 6 also has a VCM 10 that provides support to the pivot bearing 8 to be rotated. The outer crash stopper 14 is mounted on the base to prevent the head 4 from escaping outward on the disk 2, and the magnet 16 is attached to the other end of the actuator 6 when the hard disk drive is not in use. The actuator 6 is fixed by contacting the iron piece 12 which has been made by magnetic force. 1 shows the state in which the actuator 6 is latched by the magnet 16. As shown in FIG. 1, when the power supply is "ON" in a state where the actuator 6 is latched, a constant current is applied to the VCM 10 by the servo controller so that the actuator 6 is unlatched.

If the servo control unit does not recognize the unlatching of the actuator 6, it causes the outer crash stopper 14 and the iron piece 12 to collide by continuously applying current to the VCM 10. At this time, the servo control unit of the hard disk drive using the solenoid latch method and the error-flow latch method directly or indirectly recognizes the unlatching moment of the actuator to prevent the collision between the outer crash stopper 14 and the iron piece 12 in advance. However, in the hard disk drive using the magnet latch method, the actuator 6 cannot know whether the actuator 6 is unlatched until the prescribed servo signal is input from the track of the designated data area. If a defect occurs in the designated data area or an error is included in the servo signal read from the designated data area, the servo controller cannot determine whether the actuator 6 is unlatched. Therefore, a current is continuously applied to the VCM 10, and as a result, the outer crash stopper 14 and the iron piece 12 collide with each other, thereby causing a problem that the disk 2 and the head 4 are damaged.

Accordingly, an object of the present invention is to provide an unlatch detection apparatus and method capable of preventing collision of an outer crash stopper and an actuator by detecting an unlatch of an actuator in a hard disk drive using a magnet latch method.

The present invention for achieving the above object is provided with a head for recording or reproducing data at one end, and the other end of the magnet latch latch type hard disk drive having an actuator attached to the iron sticks to stick to the magnet well And a latching iron piece attached to the magnet, the latch iron piece being at least partially in contact with the iron piece when the hard disk drive is not in use, power supply means for supplying a predetermined level of power when driving power of the hard disk drive is input, and the iron piece; Unlatch detection means for outputting an unlatch detection signal according to a prescribed level input from the power supply means in response to the latch iron piece being detached, and an unlatch current being applied to the actuator in response to receiving the unlatch detection signal. Characterized in that the control means for blocking the.

Hereinafter, exemplary operations of the present invention will be described in detail with reference to the accompanying drawings. Many specific details are set forth in order to provide a more thorough understanding of the present invention, such as the location and specific processing flow of the outer crash stopper and magnet described in the following description and accompanying drawings. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a diagram illustrating a connection state between the unlatch detection apparatus and the HDA according to an embodiment of the present invention. In FIG. 2, the iron piece 12 attached to the other end of the actuator 6 is grounded in a circuit, and a latch iron piece 18 is positioned between the iron piece 12 and the magnet 16. At this time, the latch iron piece 18 must be mechanically designed to be in contact with the iron piece 12 when the actuator 6 is latched, and at the same time, the connection point P between the resistors R1 and R2 constituting the unlatch detection unit 20. Must be connected to the circuit). On the other hand, the unlatch detection unit 20 is composed of a resistor R1 (10 [KΩ]) and R2 (5 [KΩ]) connected in series between the input power supply side and the ground side, and the connection point P between the resistors R1 and R2. Is also connected to the P1 terminal of the CPU 22 which performs servo control of the hard disk drive. The unlatch detection unit 20 generates an unlatch detection signal according to the input power source 5 [V] when the iron piece 12 attached to the other end of the actuator 6 is separated from the latch iron piece 18. Output to CPU22. The CPU 22 outputs a control signal to the VCM driver 24 for unlatching the actuator 6 when the driving power is input to the hard disk drive. On the other hand, when the CPU 22 receives the unlatch detection signal according to the input power through the P1 terminal, the CPU 22 outputs a control signal for cutting off the current applied to the VCM 10. The VCM driver 24 generates a driving current I corresponding to the control signal input from the CPU 22 and applies it to the VCM 10. The VCM 10 horizontally moves the actuator 6 in correspondence with the direction and level of the drive current input from the VCM driver 24.

3 is a control flow chart of the CPU 22 according to an embodiment of the present invention, and FIG. 4 is a timing chart according to an embodiment of the present invention. In FIG. 4, Vcc is a timing diagram for showing that the drive power of the hard disk drive is applied at the time T1, and Ready is driven under the control of the CPU 22 after the time T1, and is switched to the ready state at the time T2. A timing diagram for showing a ready section of the spindle motor is shown, I is a timing diagram of the current level applied to the VCM 10 by the control of the CPU 22 after the time T2.

Hereinafter, referring to FIGS. 2 to 4, the process of preventing the collision between the outer crash stopper 14 and the iron piece 12 by detecting the unlatching of the actuator 6 by the CPU 22 will be described. do. First, when the drive power is "on" (time T1) while the hard disk drive is not in use (i.e., the actuator 6 is latched), the CPU 22 performs an initialization process according to the initialization program in step 30 of FIG. Then proceed to step 32. At this time, the spindle motor starts to run as part of the initialization program. On the other hand, as the driving power of the hard disk drive is "on" at the time T1, a predetermined level (for example, 5 [V]) is input from the power supply (not shown) between the input power side and the ground side of the unlatch detection unit 20. ) Is applied. At this time, since the actuator 6 is in a latched state, the current due to the voltage applied to the unlatch detecting unit 20 is grounded through the latch iron piece 18 and the iron piece 12. Therefore, the unlatch detection signal received through the P1 terminal of the CPU 22 maintains the "low" level until the actuator 6 is unlatched. On the other hand, in step 32, the CPU 22 checks whether the spindle motor driven during the initialization process is ready. If the spindle motor rotates in the ready state at the time T2 of FIG. 4, the CPU 22 proceeds to step 34 and applies the unlatching current to the VCM 10, and then proceeds to step 36. At this time, the unlatching current applied to the VCM 10 under the control of the CPU 22 has a current level that gradually increases after the time T2, as shown in the current timing diagram I shown in FIG. Then, if the actuator 6 is unlatched by the unlatching current I applied to the VCM 10 at the time T3, the iron piece 12 attached to the other end of the actuator 6 is separated from the latch iron piece 18. . As a result, the contact P of the unlatch detection unit 20 maintains the potential of the "high" level by the pull-up resistor R1. On the other hand, the CPU 22 checks whether an unlatch detection signal having a "high" level is received from the unlatch detection unit 20 through the P1 terminal in step 36. As a result of the inspection, when an unlatch detection signal having a "high" level is received, the CPU 22 proceeds to step 38 to block the unlatching current applied to the VCM 10, and then enters the drive ready mode. ) Detects whether the actuator 6 is unlatching by receiving an unlatch detection signal having a "high" level from the unlatch detecting unit 20, and in response, cuts off the unlatching current applied to the VCM 10. The collision of the crash stopper 14 and the iron piece 12 is prevented beforehand.

As described above, the present invention detects whether the actuator is unlatched in the hard disk drive using the magnet latch method, and prevents the crash of the outer crash stop and the iron pieces attached to the other end of the actuator, thereby preventing damage to the head and the disk. There is an advantage to avoid.

Claims (4)

In the latching detection device of a magnet latch type hard disk drive having a head having a head for recording or reproducing data at one end and having an actuator with an iron piece attached to the magnet at the other end, the magnet is attached to the magnet and attached to the hard. A latch iron piece in which at least a portion of the iron piece is in contact with the iron piece when the disk drive is not in use, a power supply means for supplying a predetermined level of power when the driving power of the hard disk drive is input, and in response to the iron piece and the latch iron piece being separated And an unlatch detection means for outputting an unlatch detection signal according to a prescribed level input from the power supply means, and a control means for blocking an unlatch current applied to the actuator in response to receiving the unlatch detection signal. Actuator unlatch detection device. 2. The actuator unlatching detection device according to claim 1, wherein the iron piece attached to the other end of the actuator is grounded in a circuit. 3. The latching piece and the control means according to claim 2, wherein the unlatching detecting means comprises a first resistor and a second resistor connected in series between the power supply means and the ground. Actuator unlatch detection device, characterized in that connected to. An actuator having a head for recording or reproducing data at one end, and an actuator having iron pieces attached to the magnet at the other end, a latch iron piece attached to the magnet and contacting at least a portion of the iron piece when latching the actuator, and the iron piece And a latching means for outputting an actuator unlatching detection signal in response to a case where the latch piece is separated from the latch piece, wherein the actuator latching detection method of the magnet latch type hard disk drive includes: A process of applying an unlatching current for unlatching an actuator, a process of checking whether an unlatching detection signal is received from the unlatching detecting means when the unlatching current is applied, and a result of receiving the unlatching detection signal In response to the current Actuator unlatching detection method comprising the step of blocking the unlatching current in response to the input of the unlatching detection signal according to the input power when the iron piece of the liquid-phase actuator is separated from the magnet.