KR20040072073A - Method and apparatus for controlling spindle motor of disk drive on write mode - Google Patents

Abstract

PURPOSE: A method and an apparatus for controlling a spindle motor in a recording mode of a disk drive are provided to reduce a mechanical noise by reducing rotary speed of a spindle motor in an inner peripheral area while maintaining the maximum speed set in a recording mode. CONSTITUTION: A pick-up(20) is formed of a laser diode, photo diodes, and various lenses for writing a signal on a disk(10) or detecting an optical signal reflected from the disk, and generates a predetermined signal for processing signals and controlling a servo. An R/F(Radio Frequency) signal processor(30) sets a pattern of the signal for processing the signals and converts the signal into a binary signal. A digital signal processor(60) receives the binary signal for processing the binary signal and separating header information included in the inputted signal. A memory(70) stores a spindle motor rotary speed look-up table by positions differently setting target rotary speed of a spindle motor(110) by areas. If a recording command is inputted from a host computer, a system control unit(80) judges the current position by using the header information, and decides the target rotary speed information of the spindle motor corresponding to the judged position, and generates a spindle motor control signal for controlling the spindle motor at the decided target rotary speed. A servo control unit(90) generates a spindle motor control voltage corresponding to the spindle motor control signal. A driving unit(100) generates a driving current corresponding to the spindle motor control voltage.

Description

Method and apparatus for controlling spindle motor in disk drive on write mode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling a disk drive, and more particularly, to a spindle motor in a recording mode of a disk drive that controls the rotational speed of the spindle motor to reduce mechanical noise while maintaining the highest product speed in the high speed recording mode. A control method and apparatus are provided.

There are two methods of controlling the disk rotation speed of the disk drive: Constant Linear Velocity (CLV) and Constant Angular Velocity (CAV).

The CLV control method is a control method in which the pickup maintains a constant linear speed at which the track tracks. The recording and playback speeds are the same at the inner and outer circumferences of the disk, and the rpm of the spindle motor that rotates the disk at the inner circumference of the disk is maximum. The revolution per minute (rpm) of the spindle motor decreases toward the outer circumference.

The CAV control method is a control method that maintains a constant disk rotational angular velocity, so that the rpm of the spindle motor is constant regardless of the internal / external circumference of the disk, so that a difference in recording and reproducing speed occurs in the internal / external circumference of the disk. That is, as shown in Figure 1, the spindle motor has the same rotational speed of about 10,000 rpm in the inner and outer circumference, it is possible to achieve a speed of 22 times at the innermost, 48 times at the outermost.

In general, the disk drive displays the product performance at the maximum speed, so from above 16 times, using ZCLV (Zone CLV) or CAV control method, rather than the CLV control method.

However, according to the related art, when the recording is applied by the CAV control method, the disk drive rotates at a high speed of 10,000 or more at 10,000 rpm in order to realize a high speed performance of 48 times or more. there was.

The technical problem to be achieved in the present invention is to reduce the noise by reducing the rotational speed of the spindle motor in the inner peripheral area while maintaining the maximum speed set in the recording mode of the CAV control method to solve the above problems in the recording mode of the disk drive To provide a spindle motor control method and apparatus.

1 is a graph showing the relationship between the rotational speed and the double speed of the spindle motor for each position of the disk in the CAV control method according to the prior art.

2 is a block diagram of a disk drive to which the present invention is applied.

3 is a flowchart of a spindle motor control method in a recording mode of a disk drive according to a first embodiment of the present invention.

4 is a flowchart of a spindle motor control method in a recording mode of a disk drive according to a second embodiment of the present invention.

5 is a flowchart of a spindle motor control method in a recording mode of a disk drive according to a third embodiment of the present invention.

Figure 6 shows an example of the position-specific spindle motor rotational speed lookup table applied to the present invention.

7 is a graph showing the relationship between the rotational speed and the double speed of the spindle motor for each position of the disk before improvement.

8 is a graph showing the relationship between the rotational speed and the double speed of the spindle motor for each position of the disk when the present invention is applied.

In order to achieve the above technical problem, the spindle motor control method in the recording mode of the disk drive according to the first embodiment of the present invention is a disk drive control method, which (a) is a recording mode by a constant angular velocity (CAV) control method. (B) detecting the current recording position at which the pickup is located in the recording mode according to the constant angular velocity control method as a result of the determination of step (a), and (c) detecting in the step (b) Determining target rotational speed information according to the recording position, and (d) controlling the speed of the spindle motor with the target rotational speed information determined in step (c).

In order to achieve the above technical problem, a spindle motor control method in a recording mode of a disk drive according to a second embodiment of the present invention is a disk drive control method employing a constant angular velocity (CAV) control method, which includes: (a) a host; Determining whether a write command is input from a computer, (b) if a write command is input from a host computer as a result of the determination of step (a), determining a size of data to be recorded, (c) said step (b) Determining the recording end position of the disc according to the size of the data to be recorded determined in step (d), (d) determining target rotational speed information corresponding to the recording end position of the disc determined in step (c); e) controlling the speed of the spindle motor with the target rotational speed information determined in step (d).

In order to achieve the above technical problem, the spindle motor control apparatus in the recording mode of the disk drive according to the present invention is a disk drive employing a constant angular velocity control method, which is composed of a laser diode, a photo diode and various lenses, and a disk. A pickup for recording a signal on or detecting an optical signal reflected from the disk, generating a predetermined signal for signal processing and servo control, converting the signal processing signal detected by the pickup into a binary signal after filtering A digital signal processing unit for inputting a binary signal processed by the R / F signal processing unit, a binary signal processed by the R / F signal processing unit, to separate the header information included in the input signal, and a recordable area of the disc. Divide into multiple zones and set the target rotational speed Memory for storing the spindle motor rotational speed lookup table for each position that is set correctly, and when a write command is input from a host computer, the current position is determined using the header information processed by the digital signal processor, and the corresponding position is determined. A system controller configured to determine target rotational speed information of the spindle motor by using a spindle motor rotational speed lookup table stored in the memory and to generate a spindle motor control signal for controlling the spindle motor at the determined target rotational speed; And a driving unit for generating a spindle motor control voltage corresponding to the spindle motor control signal and a driving unit for generating a driving current corresponding to the spindle motor control voltage generated by the servo control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a disc drive to which the present invention is applied includes a disc 10, a pickup 20, an R / F signal processor 30, an optical driver 40, an encoder 50, and a digital signal processor ( DSP 60, memory 70, system controller 80, servo controller 90, driver 100, spindle motor 110 and sled motor 120.

First, the operation of each component is as follows.

The pickup 20 is composed of a laser diode, a plurality of photodiodes, various lenses, and an actuator for moving the lens in a horizontal / vertical direction, and projects the optical signal onto the disk and detects the optical signal reflected from the disk. Run In particular, a plurality of photodiodes are combined, and these signals are combined to generate a tracking error signal T.E and a focus error signal F.E for servo control, and also generate a signal used for signal processing.

The R / F signal processor 30 converts the signal processing signal detected by the pickup 20 into a binary signal and then outputs it to the digital signal processor 60 after converting the signal to a binary signal.

The optical driver 40 outputs a light quantity driving signal according to the input signal in the recording mode, and outputs a driving signal for generating a constant level of laser power in the reproducing mode.

The encoder 50 reconverts the data converted into the recording format by the digital signal processing unit 60 into a bitstream and outputs the data to the optical driver 40.

The digital signal processing unit 60 executes signal processing for restoring the binary signal input from the R / F signal processing unit 30 to the original data with its own phase-locked clock. In the recording mode, the error correction code is input to the digital data input. (ECC) or the like is added to execute signal processing for converting to a recording format. In addition, the header information is separated from the restored data and output to the system controller 80.

The servo controller 90 generates an actuator driving voltage of the pickup 20 for controlling the pickup 20 in the horizontal or vertical direction by using the tracking error signal and the focus error signal, and picks up the target track in the seek mode ( A driving voltage of the sled motor 130 for moving 20 is generated. Then, the spindle motor driving voltage for driving the spindle motor 110 is generated corresponding to the spindle motor target rotational speed determined by the system controller 80.

The driver 100 generates a driving current for driving the spindle motor 110 and the sled motor 120 according to the driving voltage generated by the servo controller 90, and focuses and tracks the optical lens of the pickup 20. To generate an actuator driving current of the pickup 20 for controlling.

In the memory 70, spindle motor rotational speed lookup table information for each position is stored, and spindle motor rotational speed lookup table information for each position divides the recordable area of the disc into a plurality of predetermined areas, and the logical block address LBA for each region is stored. In proportion, the target rotational speed of the spindle motor is increased.

The spindle motor rotational speed lookup table for each position may be designed as shown in FIG. 6 as an example.

The system controller 80 collectively controls the disk drive to suit the mode set according to the key input. In particular, when a recording command is input from a host computer (not shown in the figure), the current position of the pickup on the disc is determined using the header information processed by the digital signal processing unit 60, and the corresponding position is determined. Spindle for determining the target rotational speed information of the spindle motor using the spindle motor rotational speed lookup table for each position as shown in FIG. 6 stored in the memory 80 and controlling the spindle motor 110 at the determined target rotational speed. The motor control signal is generated and output to the servo controller 90.

That is, when a write command is input from the host computer, the system controller 80 calculates a logical block address (LBA) from Atip Min (minute), Sec (second), and Frm (frame) information included in the header information. The target rotational speed (rpm) information of the spindle motor corresponding to the calculated LBA is determined using the spindle motor rotational speed lookup table for each position stored in the memory 70, and the spindle motor 110 is controlled at the determined target rotational speed. It generates a spindle motor control signal for output to the servo control unit 90.

As shown in FIG. 6, the spindle motor rotational speed lookup table for each position divides the recordable section of the disk into nine regions (STEP) as an example, sets the rotational speed of the spindle motor differently for each region, and the logic block. It is designed to increase the target rotational speed of the spindle motor in proportion to the address (LBA).

Here, the setting of the target rotation speed may be determined by applying Equation 1 as an example.

Target rpm = 7350 * 2π / (Pn * Lv) * Tp * n * a

Where, Pn: number of FG poles of the spindle motor

Lv: linear velocity of the disk

Tp: Track pitch of the disc

n: LBA of the current recording position

a: ratio of (inner rpm) / (outer rpm)

Then, the servo controller 90 generates a spindle drive voltage corresponding to the spindle motor control signal generated by the system controller 80 and outputs the generated drive voltage to the drive unit 100, and the drive unit 100 outputs the spindle drive voltage to the spindle motor drive current. Is converted to and applied to the spindle motor 110.

Accordingly, the speed of rotation of the spindle motor 110 as an example, as shown in Figure 8, in the outermost circumference of the disk, the spindle motor rotates at about 10,000rpm so as to ensure 48 times the performance specification of the product, As the inner circumference gradually decreases, the rotational speed of the spindle motor decreases to about 9,500 rpm in the innermost circumference to improve mechanical noise.

Different embodiments of the spindle motor control method in the recording mode of the disk drive according to the present invention are shown in the flowcharts of Figs.

First, the spindle motor control method in the recording mode of the disk drive according to the first embodiment of the present invention will be described in detail with reference to the flowchart of FIG. 3.

In a disc drive employing a constant angular velocity (CAV) control method, it is determined whether the current mode is in the recording mode (step 301).

When the determination result of step 301 is in the recording mode, the current recording position where the pickup 20 is located on the disc 10 is detected (step 302). The current recording position is detected by calculating a logical block address (LBA) from Atip Min (minute), Sec (second), and Frm (frame) information included in the header information.

Then, target rpm information of the spindle motor 110 corresponding to the recording position detected in step 302 is determined using the spindle motor rotational speed lookup table for each position as shown in FIG. 6 (step 303).

Then, it is controlled to rotate the spindle motor 110 at the target rpm speed determined in step 303 (step 304).

Accordingly, the rotational speed of the spindle motor in the inner circumference of the disk can be reduced to reduce the mechanical noise.

Next, the spindle motor control method in the recording mode of the disk drive according to the second embodiment of the present invention will be described in detail with reference to the flowchart of FIG.

In step 401, it is determined whether or not a recording command is inputted from a host computer externally connected to the system control unit 80 of the disk drive employing a constant angular velocity (CAV) control method.

When the recording command is input from the host computer as a result of the determination in step 401, the size of data to be recorded is determined (step 402).

The recording end position of the disc is determined according to the size of data to be recorded determined in step 402 (step 403).

Target rotational speed information corresponding to the recording end position of the disc determined in step 403 is determined (step 404). The method for determining the target rotational speed information corresponding to the recording end position of the disc may use the lookup table shown in FIG. 6, but may use a lookup table designed separately. In this case, it is more effective to reduce the rotational speed of the spindle motor than to the lookup table shown in FIG.

Then, the rotation speed of the spindle motor is controlled at the target rotation speed determined in step 404 (step 405).

In the first embodiment of the present invention shown in FIG. 3, the rotational speed of the spindle motor is changed as the position of the disc is changed during the execution of the recording mode, whereas in the second embodiment of the present invention shown in FIG. Once the target rotational speed of the spindle motor is determined in accordance with the size of the data, it is different in that it controls to keep the target rotational speed determined in the recording mode regardless of the area.

Finally, the spindle motor control method in the recording mode of the disk drive according to the third embodiment of the present invention will be described in detail with reference to the flowchart of FIG. 5.

In step 501, it is judged whether or not a recording command is inputted from a host computer externally connected to the system control unit 80 of the disk drive employing a constant angular velocity (CAV) control method.

When the recording command is input from the host computer as a result of the determination in step 501, it is determined whether the size of the data to be recorded is full size data that requires a recording area equal to or greater than the critical area of the disc (step 502). In this case, the threshold region may be determined as a start LBA of 9 steps (regions) when using the lookup table shown in FIG. 6 as an example.

If the determination result of step 502 is full size data, the current recording position where the pickup 20 is located on the disc 10 is detected (step 503). The current recording position is detected by calculating a logical block address (LBA) from Atip Min (minute), Sec (second), and Frm (frame) information included in the header information.

Then, target rpm information of the spindle motor 110 corresponding to the recording position detected in step 503 is determined using the spindle motor rotational speed lookup table for each position as shown in FIG. 6 (step 504).

If the determination result in step 502 is not full size data, the size of data to be recorded is determined (step 505).

Then, the recording end position of the disc is determined according to the size of the data to be recorded determined in step 505, and target rotational speed information corresponding to the determined recording end position of the disc is determined (step 506). The method for determining the target rotational speed information corresponding to the recording end position of the disc may use the lookup table shown in FIG. 6, but may use a lookup table designed separately. In this case, it is more effective to reduce the rotational speed of the spindle motor than to the lookup table shown in FIG.

Then, control is made to rotate the spindle motor 110 at the target rpm speed determined in step 504 or step 506 (step 507).

The third embodiment of the present invention shown in FIG. 5 corresponds to an embodiment combining the first embodiment shown in FIG. 3 and the second embodiment shown in FIG. 4. That is, when the data to be recorded corresponds to the full size, the rotation speed of the spindle motor is controlled by applying the first embodiment, and when not, the rotation speed of the spindle motor is controlled by applying the second embodiment.

Accordingly, according to the related art, although the rotational speed of the spindle motor is the same in the inner and outer circumferences in the CAV recording mode as shown in FIG. 7, the mechanical noise is severe. However, in the present invention, in the outer circumference as shown in FIG. The mechanical noise was improved by lowering the rotational speed of the spindle motor in the inner circumference while maintaining the highest speed specifications.

Of course, according to the present invention, there is a disadvantage in that the recording speed is shortened as compared with the prior art. However, when the size of data to be recorded is 100 MB, for example, when the 52x speed is applied and the 48x speed is applied, Only a few seconds of difference will occur. In comparison, the magnitude of mechanical noise is greatly reduced.

The invention can be practiced as a method, apparatus, system, or the like. When implemented in software, the constituent means of the present invention are code segments that necessarily perform the necessary work. The program or code segments may be stored in a processor readable medium or transmitted by a computer data signal coupled with a carrier on a transmission medium or network. Processor readable media includes any medium that can store or transmit information. Examples of processor-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROM (EROM), floppy disks, optical disks, hard disks, optical fiber media, radio frequency (RF) networks, Etc. Computer data signals include any signal that can propagate over transmission media such as electronic network channels, optical fibers, air, electromagnetic fields, RF networks, and the like.

Specific embodiments shown and described in the accompanying drawings are only to be understood as an example of the present invention, not to limit the scope of the invention, but also within the scope of the technical spirit described in the present invention in the technical field to which the present invention belongs As various other changes may occur, it is obvious that the invention is not limited to the specific constructions and arrangements shown or described.

As described above, according to the present invention, the maximum speed set in the recording mode of the CAV control method is maintained by controlling the rotational speed of the spindle motor for each recording area so as to lower the rotational speed of the spindle motor in the inner circumference compared to the outer circumference in the CAV recording mode. While maintaining, the rotational speed of the spindle motor in the inner circumferential region can be reduced to drastically reduce mechanical noise. In particular, the rotational speed of the spindle motor can be determined differentially according to the size of data to be recorded, resulting in an innovative reduction in mechanical noise when recording a relatively small amount of data.

Claims (13)

In the disk drive control method, (a) determining whether the recording mode is in a constant angular velocity (CAV) control scheme; (b) detecting the current recording position where the pickup is located in the recording mode according to the constant angular velocity control method as a result of the determination of step (a); (c) determining target rotational speed information according to the recording position detected in step (b); And (d) controlling the speed of the spindle motor with the target rotational speed information determined in step (c). 2. The recording mode of claim 1, wherein the recording position is a logical block address (LBA) calculated from Atip Min, Sec, and Frm information recorded in header information. Spindle motor control method. The method of claim 1, wherein the step (c) divides the recordable area of the disc into a plurality of areas, and target rotation using a spindle motor rotational speed lookup table for each position in which the target rotational speed of the spindle motor is set differently for each region. A spindle motor control method in recording mode of a disk drive, characterized in that the speed information is determined. 4. The spindle motor control of the disc drive of claim 3, wherein the spindle motor rotational speed lookup table for each position is designed to increase a target rotational speed of the spindle motor in proportion to a logical block address (LBA). Way. The spindle motor control method of claim 1, wherein the target rotation speed information is target rpm information of the spindle motor. In a disk drive control method employing a constant angular velocity (CAV) control method, (a) determining whether a write command is input from the host computer; (b) determining a size of data to be recorded when a recording command is input from the host computer as a result of the determination of step (a); (c) determining the recording end position of the disc according to the size of the data to be recorded determined in step (b); (d) determining target rotational speed information corresponding to the recording end position of the disc determined in step (c); And (e) controlling the speed of the spindle motor with the target rotational speed information determined in step (d). 7. The method of claim 6, wherein the step (d) divides the recordable area of the disk into a plurality of areas, and uses the spindle motor rotational speed lookup table for each position where the target rotational speed of the spindle motor is set differently for each region. A method of controlling a spindle motor in a recording mode of a disc drive, characterized by determining rotation speed information. 8. The spindle motor control according to claim 7, wherein the spindle motor rotational speed lookup table for each position is designed to increase a target rotational speed of the spindle motor in proportion to the logical block address (LBA). Way. 7. The spindle motor control method of claim 6, wherein the target rotation speed information is target rpm information of the spindle motor. In a disk drive control method employing a constant angular velocity (CAV) control method, (a) determining whether a write command is input from the host computer; (b) determining whether the size of the data to be recorded is full size data to be recorded over a predetermined area of the disk when a recording command is input from the host computer as a result of the step (a); (c) In the case of full size data as a result of the determination of step (b), the target rotational speed is determined for each recording area so that the target rotational speed of the spindle motor is increased in proportion to the logical block address (LBA) for each region. determining target rotational speed information corresponding to the recording end position of the disc according to the size of the data to be recorded if the determination result of step (b) is not full size data; And (d) controlling the speed of the spindle motor with the target rotational speed information determined in step (c). In a disk drive employing a constant angular velocity control system, A pickup consisting of a laser diode, a photodiode and various lenses, for picking up a signal on a disk or detecting an optical signal reflected from the disk, and generating a predetermined signal for signal processing and servo control; An R / F signal processor for converting the signal processing signal detected by the pickup into a binary signal after shaping the filter; A digital signal processing unit for inputting a binary signal processed by the R / F signal processing unit to execute predetermined signal processing and separating header information included in the input signal; A memory for dividing a recordable area of the disc into a plurality of areas and storing a spindle motor rotational speed lookup table for each position in which a target rotational speed of the spindle motor is set differently for each corresponding area; When a write command is input from a host computer, the current position is determined using the header information processed by the digital signal processor, and the target rotational speed information of the spindle motor corresponding to the determined position is stored in the memory for each position. A system controller for determining using a motor rotational speed lookup table and generating a spindle motor control signal for controlling the spindle motor at the determined target rotational speed; A servo controller for generating a spindle motor control voltage corresponding to the spindle motor control signal; And And a drive unit for generating a drive current corresponding to the spindle motor control voltage generated by the servo control unit. The first and second processes of claim 11, wherein the system controller determines whether the size of data to be recorded is full size data to be recorded over a predetermined area of the disk when a recording command is input from a host computer. In the case of full size data, the second process determines by using the spindle motor rotational speed lookup table stored in the memory, and when the first process determines that the data is not full size data, And a third process of determining target rotational speed information corresponding to the recording end position of the disk according to the present invention. The spindle motor rotational speed lookup table for each position is designed to divide the recordable area of the disk into a plurality of areas, and to increase the target rotational speed of the spindle motor in proportion to the logical block address (LBA) for each area. Spindle motor control device in the recording mode of the disk drive, characterized in that.