KR100493042B1 - Method for controlling motor for rotating disc in search mode and disc drive thereof - Google Patents

Abstract

The present invention is a method for controlling a disk rotation motor by the RPM existing between the current RPM and the target RPM in the search mode of the disk to be rotated by the RPM set for each zone (RPM), and a disk driver suitable therefor.

In the method according to the present invention, when the disc drive is set to the search mode, the rotation speed of the disc assigned to the current position of the pickup provided in the disc drive is detected as the current rotation speed. Then, the rotation speed of the disk assigned to the target position of the disk to be searched by the search mode is detected as the target rotation speed. Then, one rotation speed is detected by calculating the current rotation speed and the target rotation speed. When the pickup is moved to the target position according to the search mode, the disc rotation motor is driven at the detected rotation speed.

As a result, the data read performance of the disk can be reduced by reducing the time required for the disk rotation motor to stabilize and reducing the load that may occur due to the large difference between the current RPM and the target RPM. performance can be improved.

Description

Method for controlling motor for rotating disc in search mode and disc drive suitable for it

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disc rotation motor control in a disc drive, and more particularly, to a disc rotation motor control method and a disc drive suitable therefor in a search mode.

Discs are generally classified into compact discs (CDs) and digital versatile discs (DVDs). CD is divided into CD-ROM, CD-RW (ReWritable), and DVD is divided into DVD-ROM and Random Access Memory (DVD-RAM).

Among such discs, a disc such as a DVD-RAM has a rotational speed per minute (RPM, abbreviated as RPM) for each zone. Therefore, in order to read the data recorded on the disc such as the above-described DVD-RAM, the conventional disc driver rotates the disc by driving the disc rotation motor using the revolutions per minute set for each zone. Let's do it.

In the search mode for the rotating disk as described above, the conventional disk driver drives the disk rotation motor at an RPM (hereinafter referred to as a target RPM) set in the region of the disk where the target is located. Therefore, when there is a difference between the RPM set in the region of the disk where the pickup is currently located (hereinafter referred to as current RPM) and the target RPM, the rotation speed of the disk rotation motor should be increased or decreased by the difference so that the operation of the disk rotation motor may be stopped. Some time is required to stabilize.

If the pickup reaches the target position before the disc rotation motor is stabilized, the data recorded on the disc may not be read normally. As described above, the case where the pickup reaches the target position before the operation of the disk rotating motor is stabilized is likely to occur when the difference between the current RPM and the target RPM is large.

In addition, when the search mode in which the difference between the current RPM and the target RPM is large lasts for a long time, the device for driving the disk rotating motor may be overloaded.

The present invention has been proposed to solve the above-described problems, in the search mode of the disk to be rotated by the RPM set per minute (RPM), the disk rotation motor is controlled by the RPM existing between the current RPM and the target RPM It is an object of the present invention to provide a method and a disk drive suitable for the same.

In order to achieve the above objects, a method according to the present invention comprises the steps of: detecting the rotational speed of a disk assigned to a current position of a pickup provided in the disk driving as the current rotational speed when the disk driving device is set to a search mode; Detecting the number of revolutions of the disc assigned to the target position of the disc to be searched by the search mode as a target number of revolutions; Detecting one rotational speed by calculating the current rotational speed and the target rotational speed; Preferably, when the pickup is moved to the target position according to the search mode, driving the disk rotating motor at the detected rotation speed.

Preferably, the one rotational speed is an approximation of the average rotational speed of the current rotational speed and the target rotational speed. It is preferable that the said rotation speed is the rotation speed per minute.

Disc drive according to the present invention to achieve the above objects, the pickup unit for picking up the data recorded on the disc; An amplifier for amplifying the high frequency signal output from the pickup unit; A decoder for converting and decoding the signal output from the amplifier into a digital signal; A motor for rotating the disk; When the search mode for the disc is started, the number of revolutions of the disc assigned to the current position of the pickup unit is detected as the current number of revolutions based on the current position information of the pickup unit provided from the decoder, and the target of the disc to be searched is detected. The rotation speed of the disk assigned to the target position is detected as the target rotation speed based on the positional information, and the one rotation speed is detected by calculating the detected current rotation speed and the target rotation speed, and the detected one rotation speed It is preferable to include a system control unit for controlling the motor to be driven.

Preferably, the system control unit detects the rotational speed approximating the average value of the current rotational speed and the target rotational speed as the one rotational speed.

The disk driver further includes a lookup table storing rotational speed information of each position of the disk for the disk, and the system control unit uses the current positional information and target positional information to display the current rotational speed in the lookup table. And the target rotational speed are preferably detected respectively. Preferably, the lookup table manages the rotation speed information for each zone set in the disk.

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

Referring to FIG. 1, a disk driver according to the present invention may include a host interface 101, a system controller 102, a decoder 103, a table 104, an RF amplifier 105, a pickup 106, and a disk ( 107, the servo unit 108, the driving unit 109, and the spindle motor 110.

The host interface 101 receives a command transmitted from a host not shown, transmits the command to the controller 102, and transmits data read from the disk 107 to the host according to the command. The command includes a read command or target position information.

When the target location information is received from the host interface unit 101, the controller 102 checks whether the current location information matches the target location information. The current location information is provided from the decoder 103. If the current position information and the target position information match, the controller 102 controls the decoder 103 such that the data decoded by the decoder 103 is transmitted to the host through the host interface 101. In this case, the disc driver may be configured such that the decoded data is transmitted to the host interface 101 through a buffer (not shown).

If the target position and the current position information do not match, the controller 102 determines the operation mode of the disk drive as a search mode and starts the search mode. At this time, the system control unit 102 detects the zone number of the disk 107 on which the pickup unit 106 is currently located, based on the current position information transmitted from the decoder 103.

For example, if the location information is a track number, the system control unit 102 detects an area number including the track number. The relationship information between the track number and the zone number may be managed by the system controller 102 by itself or by using the table 104. The relationship information may be defined as, for example, tracks 0 to 5 as zone 0 and tracks 6 to 10 as zone 1. If the relationship information between the track number and the zone number is defined as described above, and the current position information is track 4, the system control unit 102 detects the zone number of the corresponding disk 107 as "0".

The system control unit 102 detects the current revolutions per minute (hereinafter, abbreviated as RPM) using the detected zone number. The RPM per zone number of disk 107 is stored in table 104. Therefore, when the zone number is detected, the system controller 102 reads the corresponding RPM (current RPM) from the table 104 using the detected zone number as an address.

The system control unit 102 then detects the target zone number based on the target location information received from the host interface 101. The method for detecting the target zone number is the same as the method for detecting the current zone number.

The system controller 102 detects the target RPM based on the detected target zone number. That is, the system control unit 102 reads the corresponding RPM (target RPM) from the table 104 using the detected target zone number as an address.

The system controller 102 detects one RPM existing between the current RPM and the target RPM by using the detected current RPM and the target RPM. That is, the system controller 102 calculates the current RPM and the target RPM to detect an average value between the current RPM and the target RPM. The system controller 102 may detect the detected average value as one RPM. At this time, if the detected average value is not an integer, the system control unit 102 may detect an integer approximating the detected average value with one RPM.

The system control unit 102 provides a control signal for rotating the spindle motor 110 at the detected RPM while providing a signal to the servo unit 108 to control the pickup unit 106 to be moved to the target position of the disk 107. To the servo unit 108.

Accordingly, the servo unit 108 drives the pickup unit 106 and the drive unit 109 in the same manner as before. The drive unit 109 drives the spindle motor 110 to rotate the disk 107. Spindle motor 110 is a motor that rotates disk 107.

When the pickup section 106 reaches the target position of the disk 107, the pickup section 106 reads the data recorded on the disk 107 and outputs the data to the RF amplifying section 105.

The RF amplifier 105 amplifies and outputs the RF signal transmitted from the pickup unit 106 to a predetermined value.

The decoder 103 converts the signal output from the RF amplifier 105 into a digital signal and decodes it. At this time, the decoder 103 provides the system control unit 102 with the current position information included in the RF signal picked up from the disk 107. The decoded data is transmitted to the host interface 101.

2 is a flowchart illustrating a method of controlling a disk rotation motor in the search mode according to the present invention.

When the search mode is started because the target position received from the host and the position of the disk 107 of the current pickup unit 106 are different from each other, the system control unit 102 determines whether the current pickup is located in FIG. Detect the current zone number in the same manner as described in

Next, in step 202, the system controller 102 detects the current RPM in the same manner as in FIG. 1 using the detected current zone number.

The system controller 102 detects the target zone number based on the target location information received from the host (not shown) in operation 203.

In operation 204, the system controller 102 detects the target RPM using the target zone number.

In operation 205, the system controller 102 detects an appropriate RPM using the detected current RPM and the detected target RPM. That is, the system controller 102 detects an average value of the current RPM and the target RPM, and sets the detected average value to the one RPM. At this time, if the detected average value is not an integer, the system control unit 102 sets an integer close to the detected average value to one RPM.

In step 206, the system controller 102 controls the spindle motor 110 at the detected RPM while moving the pickup 106 to the target position of the disk 107 according to the search mode.

According to the present invention described above, in the search mode for a disk to be rotated at a revolutions per minute (RPM) set for each zone, the spindle motor as a disk rotation motor at a value close to the average value between the current RPM and the target RPM By searching the target position while driving, it reduces the load that can be generated on the device driving the spindle motor due to the large difference between the current RPM and the target RPM, and reduces the time required for the disk rotation motor to stabilize. By reducing the number of occurrences of pickups reaching the target position of the disk before operation is stabilized, data read performance on the disk can be improved compared to the conventional method.

The present invention is not limited to the above-described embodiments, and variations of the present invention can be made by those skilled in the art within the spirit of the present invention. Therefore, the scope of claims in the present invention will not be defined within the scope of the detailed description will be defined by the claims below.

1 is a functional block diagram of a disk drive according to the present invention.

2 is a flowchart illustrating a method of controlling a disk rotation motor in the search mode according to the present invention.

Claims (7)

In the disk rotation motor control method provided in the disk drive, If the disc driver is set to a search mode, detecting the number of revolutions of the disc assigned to the current position of the pickup provided in the disc driver as the current number of revolutions; Detecting the number of revolutions of the disc assigned to the target position of the disc to be searched by the search mode as a target number of revolutions; Detecting one rotational speed by calculating the current rotational speed and the target rotational speed; Driving the disc rotating motor at the detected rotational speed when the pickup is moved to the target position according to the search mode, And said one rotational speed is an approximation of an average rotational speed of said current rotational speed and said target rotational speed. delete The method of claim 1, wherein the rotation speed is a revolution per minute. In the disk drive for driving the disk, A pickup unit for picking up the data recorded on the disc; An amplifier for amplifying the high frequency signal output from the pickup unit; A decoder for converting and decoding the signal output from the amplifier into a digital signal; A motor for rotating the disk; When the search mode for the disc is started, the number of revolutions of the disc assigned to the current position of the pickup unit is detected as the current number of revolutions based on the current position information of the pickup unit provided from the decoder, and the target of the disc to be searched is detected. The rotation speed of the disk assigned to the target position is detected as the target rotation speed based on the positional information, and the one rotation speed is detected by calculating the detected current rotation speed and the target rotation speed, and the detected one rotation speed And a system control unit for controlling the motor to be driven. And the system controller detects a rotational speed approximating an average of the current rotational speed and the target rotational speed as the one rotational speed. delete The disk drive of claim 4, wherein And a lookup table for storing rotational speed information of the disc for each position of the disc, The system controller detects the current rotational speed and the target rotational speed in the lookup table using the current positional information and the target positional information, respectively. The disk drive of claim 6, wherein the lookup table manages the rotation speed information for each zone set in the disk.