JPH10293960A - Disk driving method and disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk driving method and a disk device with low power consumption by reducing the power consumption of a spindle motor. SOLUTION: This method is provided with the spindle motor 12 revolving with the mounted disk 11, a spindle controller 14 having the gain changeover function capable of changing over the control gain while controlling the revolution, a spindle driver 13 for driving the spindle motor 12, a revolution detector 17 for detecting the number of revolution, and a signal processor 15 for calculating the revolving fluctuation coefficient based on the revolving command and an output of the revolution detector 17 and further obtaining the corresponding optimum gain setting ratio to output the changeover command of the control gain and also managing the process of the whole device. In this case, by setting the optimum control gain corresponding to the weight (moment of inertia) of the disk, the playability performance is satisfied and also the spindle is driven by the absolute minimum power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive method and a disk drive for recording and reproducing data by connecting to a computer or the like.

[0002]

2. Description of the Related Art As a recording medium for a computer having a high recording density and capable of large-capacity recording, a magneto-optical disk drive for recording / reproducing data at a constant angular velocity, and data recording at a constant linear velocity as a central part of multimedia. CD to play
-ROM devices have become widespread, and DVD drive devices have attracted attention as large-capacity disk devices that will replace them in the future. In recent years, many of these disk devices have been built in notebook computers, and developments for miniaturization and reduction in power consumption have been actively conducted.

[0003] The configuration of a spindle motor control system for rotating a disk will be described below with reference to the drawings using a CD-ROM drive as an example. FIG.
FIG. 2 is a block diagram of a spindle control of a conventional disk drive. In FIG. 6, reference numeral 21 denotes a disk on which information signals are recorded at a constant linear velocity; 22, a spindle motor on which the disk 21 is mounted to rotate; and 23, a spindle motor 22 according to a control signal from a spindle controller 24 described later.
, A spindle controller 24 for controlling the rotation of the spindle motor 22 to a constant linear velocity with a fixed gain, and a signal processor 25 for controlling the processing of the entire disk drive.

[0004] In the conventional disk drive configured as described above, the sequence at the time of initial startup after loading the disk is shown in the flow chart of FIG.
The operation of each block will be described with reference to (reading and starting at 6 × speed). FIG. 7 is a flowchart at the time of starting the conventional disk device.

First, an optical reading and offset adjustment relating to a signal reproducing circuit are performed (S1), and a semiconductor laser as a light source is turned on (S2). In order to focus the laser light on the signal recording surface of the disk 21, the optical reading system performs focus pull-in (S3).

Next, in order to perform the TOC read at the standard speed (1 × speed), the servo gain G is set to G10, and the control mode of the rotation speed of the spindle motor 22 is changed to the standard speed CLV.
The mode is set (S4). Further, the track balance is adjusted for tracking control, and the track is pulled in by the tracking servo (S5). Further, the focus balance is adjusted for focus control, the gain of the focus servo is adjusted (S6), and the gain of the tracking servo is adjusted (S7). Thus, TO
The C area is accessed and the TOC read is performed (S8).

Next, for example, in order to perform reproduction at 6 × speed, the servo gain G is set to G60, and the control mode of the rotational speed of the spindle motor 22 is set to 6 × CLV mode (S9). Thus, the reproduction operation of the target area in the 6 × speed mode is started (S10).

During steps 1 to 10 described above,
As for the focus servo system and the track servo system, since the light utilization efficiency of the optical system and the signal characteristics of the disk 21 vary greatly, the function of auto gain control is used to correct the loop gain variation due to these factors, and the playability characteristics are improved. Make settings that satisfy.

The spindle controller 24 receives a start command from the signal processor 25 when the spindle is started or when the rotation mode is switched (for example, standard speed → double speed → quadruple speed).
The control gain G according to the rotation mode (for example, standard speed, double speed, quadruple speed, etc.) and the reference clock for signal processing are set, and the phase between the frame synchronization signal reproduced from the disk 21 and the aforementioned reference clock is set. A drive command is output to the spindle driver 23 so as to match.

Here, in order to obtain a prescribed number of revolutions at the time of steady rotation at each of the standard speed and the 6-times speed, and to satisfy the playability characteristics, the control gain G is set to G10, G60 according to each speed. Set to. The rotation of the spindle motor 22 is controlled in response to a drive signal from the spindle driver 23. Thus, a constant linear velocity control that satisfies the required number of revolutions in a steady state for each set rotation mode is performed.

[0011]

However, in the above-mentioned conventional configuration, the variation in the gain of the spindle servo system is caused by the variation in the driving force of the spindle driver and the variation in the motor sensitivity, mainly due to the variation in the disk weight. Even if included, the auto gain control function was not used because it was considerably less than the focus servo and track servo systems. That is, the aforementioned control gain G
Is the disk weight, the driving force of the spindle drive and
The specified rotation is obtained at the steady state of each of the standard speed and the 6-times speed in consideration of variations in the motor sensitivity and the like, and is derived and set as a necessary gain for satisfying the playability characteristics.

In a conventional low rotation mode (standard to about four times speed), the variation in current consumption in the spindle servo system is insignificant when viewed from the current consumption of the entire apparatus, and does not cause much problem. .

However, the high rotation mode (6
(Approximately 20 times speed), there is a problem that excessive large current is consumed when the gain is set more than necessary, including at the time of motor acceleration and steady rotation, with respect to variations in disk weight. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a disk drive method and a disk device which reduce power consumption of a spindle motor and consume less power.

[0015]

In order to achieve this object, a disk drive according to the present invention comprises a rotating means for mounting and rotating a disk, and a driving means for operating the rotating means in response to a signal for controlling the rotation. A rotation control unit that servo-controls the rotation unit to a predetermined rotation speed and variably controls the amplification degree of the servo amplification; a rotation speed detection unit that detects the rotation speed of the rotation unit; Signal processing means for controlling the degree of amplification of the rotation control means.The signal processing means operates the rotation means for a predetermined time by the driving means, and controls the rotation based on a change in the rotation speed detected by the rotation speed detection means. The apparatus has an amplification degree calculating means for calculating the amplification degree of the means, and controls the amplification degree of the rotation control means according to the calculation result of the amplification degree calculating means.

As described above, there is an effect that the playability characteristics can be satisfied and the drive can be performed with the minimum necessary current consumption according to the weight of the loaded disc.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a rotation driving step of a disk for mounting and rotating a disk, and a rotation of the disk for mounting and controlling the rotation by a predetermined servo control. A control step, a rotation speed variation calculating step of executing the rotation step, detecting a rotation speed and calculating a change in the rotation speed, and a control gain switching step of switching a control gain based on the rotation speed variation calculation step. A disk drive method, comprising: performing a drive step for a predetermined time and performing a rotation speed variation calculation step, then performing a control gain switching step, and performing a disk rotation control step at a predetermined rotation speed. At the initial start-up after mounting, start the spindle motor and detect fluctuations in its rotation to Indexing the amount (moment of inertia) ratio has the effect of setting an optimum control gain commensurate with the disc weight.

According to a second aspect of the present invention, there is provided a rotating means for mounting and rotating a disk, a driving means for operating the rotating means in accordance with a signal for controlling the rotation, and a rotating means for rotating the rotating means at a predetermined rotational speed. Rotation control means for performing servo control and variably controlling the amplification degree of servo amplification, rotation number detection means for detecting the rotation number of the rotation means, and adjusting the amplification degree of the rotation control means based on the detection result of the rotation number detection means. Signal processing means for controlling, the signal processing means having amplification calculating means for calculating the amplification degree of the rotation control means based on the change in the rotation speed detected by the rotation speed detection means, The disk device is characterized in that the means is operated for a predetermined time to control the amplification of the rotation control means in accordance with the calculation result of the amplification calculation means.

According to a third aspect of the present invention, in the amplification degree calculating means according to the second aspect of the present invention, in particular, a rotation fluctuation coefficient calculating means for calculating a rate of change of the rotation speed, and a rotation fluctuation coefficient calculating means. Amplification degree setting means for preliminarily storing the optimum setting ratio of the amplification degree according to the change rate of the rotation number calculated by the calculation means, based on the change rate of the rotation number calculated by the rotation variation coefficient calculation means. A disk apparatus characterized in that an optimum setting ratio of the amplification degree is obtained by referring to the amplification degree setting means, and the amplification degree of the rotation control means is controlled according to the optimum setting ratio.

At the time of initial start-up after loading the disk, the spindle motor is started and its rotation fluctuation is detected to determine a disk weight (moment of inertia) ratio, and to set an optimum control gain corresponding to the disk weight ratio. It has the effect of satisfying playability characteristics, driving with the minimum necessary current consumption according to the weight of the loaded disc, and enabling low power consumption.

According to a third aspect of the present invention, there is provided a disk apparatus according to the second aspect of the present invention, wherein the optimum setting ratio is set based on a plurality of calculations of a rate of change in the number of revolutions. It is.

Even if the weight or shape of the disk includes a large error, it is possible to accurately determine the disk diameter and set the servo gain.

(Embodiment) FIG. 1 is a block diagram showing a spindle control of a disk drive according to an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a disk on which information signals are recorded at a constant linear velocity, 12 denotes a spindle motor on which the disk 11 is mounted and rotates, 16 denotes an encoder that generates an analog rotation signal corresponding to the rotation of the disk 11, and 17 denotes A rotation speed detector 14 for detecting the rotation speed of the spindle motor 12 based on the output of the encoder 16 is a spindle controller, which controls the rotation of the spindle motor 12 at a constant linear velocity and has a function of switching a control gain. . Reference numeral 13 denotes a spindle driver that drives the spindle motor 12 in accordance with a control signal from a spindle controller 14. Reference numeral 15 denotes a signal processor that controls the entire processing of the disk device. It is incorporated as a software program inside.

A description will be given of an example of the rotation mode switching sequence from the standard speed to the 6-times speed of the disk device according to the embodiment of the present invention configured as described above. FIG. 2 is a flowchart at the time of starting the disk device according to the embodiment of the present invention, FIG. 3 is a diagram for explaining rotation fluctuation of the spindle motor 12, and FIG. 4 is a diagram showing a correspondence table between the rotation fluctuation coefficient and the optimal gain setting ratio. . Hereinafter, description will be made with reference to FIGS.

First, the signal processor 15 is connected to the amplification degree calculating means 1.
Based on 5a, an appropriate gain is set in the spindle controller 14 in advance, and a start command is output for a predetermined time Δt (for example, 1 second) (S11).

When the spindle motor 12 is driven by the spindle driver 14, a rotation variation occurs from the initial rotation speed N1 to the rotation speed N2 as shown in FIG. The signal processor 15 calculates a rotation variation coefficient based on the initial rotation speed N1 detected by the rotation speed detector 17 (normally, N1 = 0, that is, starting from a stop) and the rotation speed N2 after time Δt. K = (N2-N1) / [Delta] t is calculated (S12).

In FIG. 4, the gain setting ratio when the maximum gain is required (basic gain) is 1, and
The minimum necessary gain setting ratio (that is, 1.0 or less) Gsp that can satisfy playability characteristics according to the rotation variation coefficient K of the loaded disk including variations in disk weight, power amplifier gain, motor sensitivity, etc. Predetermined
It is stored inside the signal processor 15. Thus, the signal processor 15 selects the setting ratio Gsp according to the measured rotation variation coefficient K with reference to the rotation variation coefficient vs. gain optimum setting ratio correspondence table of FIG. 4 (S13).

Thereafter, in a series of start-up sequences, when setting the gain of the spindle servo control, the signal processor 15 controls the spindle with the gain switching function so that the value obtained by multiplying the basic gain by the set ratio Gsp becomes the control gain. Controller 1
Then, a switching command is output to No. 4 (S14).

Next, the optical reading and offset adjustment relating to the signal reproducing circuit are performed (S15), and the semiconductor laser as the light source is turned on (S16). In order to focus the laser light on the signal recording surface of the disk 11, the optical reading system performs focus pull-in (S17).

Next, in order to perform the TOC read at the standard speed (1 × speed), the servo gain G of the spindle controller 14 is set to G10 × Gsp, and the control mode of the rotation speed of the spindle motor 12 is changed to the standard speed CLV mode. (S1
8). Further, the track balance is adjusted for tracking control, and the tracking servo is pulled in the track (S19). Further, the focus balance is adjusted for focus control, and the gain of the focus servo is adjusted (S20). Further, the gain of the tracking servo is adjusted (S21). Thus, the TOC area is accessed and the TOC read is performed (S22).

Next, for example, in order to perform reproduction at 6 × speed, the servo gain G is set to G60 × Gsp, and the control mode of the rotation speed of the spindle motor 12 is set to 6 × CLV mode (S23). Thus, the reproduction operation of the target area in the 6 × speed mode is started (S24).

Here, the effect of reducing the current consumption when the present invention is applied will be described, taking as an example the steady current consumption at the time of reproducing the innermost data of a 6 × -speed CD-ROM drive.
At the innermost circumference of the 6 × speed, the rotation speed reaches about 3000 rpm, and about 30% of the current consumption (500 mA) of the entire apparatus.
(About 150 mA) is consumed by the spindle system (spindle motor 12 and spindle driver 13).
In the case of a commercially available CD, approximately 13 to 17 g (1
(5 g ± 13%). When the present invention is applied, for example, the heaviest disk (17
g disk), the lightest disk (1
The gain at the time of loading 3g disk) is about 0.75 times (about 2.5dB down as the loop gain of spindle system)
Only needs to be done.

At this time, the current consumption of the spindle system is reduced by about 20% (about 30 mA) when the lightest disc is mounted, as compared with when the heaviest disc is mounted. This has the effect of reducing the current consumption by about 6% with respect to the current consumption of the entire optical disc device. In the future, it is expected that the number of revolutions will be increased to about 8 to 20 times speed, but it goes without saying that the effect of the present invention is improved as the number of revolutions is increased.

Therefore, the disk device of the present invention can ensure the same playability characteristics as the conventional one, and can drive the spindle with the minimum necessary current corresponding to the disk weight (moment of inertia). It is possible to reduce power consumption.

Although the present embodiment has been described with respect to the initial start-up when the disc is mounted, the present invention is not limited to the start-up. For example, when the speed is changed from the standard speed to the 6-times speed, the disc rotation is started. May be performed in the middle of the process.

Further, in the present embodiment, it has been described that the gain adjustment is performed once at the time of initial startup.
The invention is not limited to this example at one time. FIG.
9 is a flowchart of a two-stage determination. In FIG. 5, first, the servo gain is set to 12 cm standard speed disk TOK.
It is set for reading (S31 represented by G10) and is activated for a predetermined time (see S11 in FIG. 2, Δt time, S32).
From the number of rotations after Δt time, whether the disc diameter is 8 cm or less,
It is determined whether it is over (see S11 to S12 in FIG. 2, S3
3).

If it is 8 cm or less, the servo gain is further set for 8 cm standard speed disk TOK read (G
08, and is started for a predetermined time (S1 in FIG. 2).
1, Δt time, S35). From the number of rotations after the time Δt, it is determined whether the disk diameter is 8 cm or less or no disk (see S11 to S12 in FIG. 2, S36).

Thus, the disk diameter is 12 cm (S33
) And the disk diameter is 8 cm (S36), a setting ratio Gsp suitable for each diameter is obtained (see S13 in FIG. 2, S37), and a value obtained by multiplying the basic gain by the setting ratio Gsp is controlled. A switching command is output to the spindle controller 14 with a gain switching function as a gain (see S14 in FIG. 2, S38). Subsequent steps are the same as step 15 in FIG.

By controlling as described above, 8c
Even if there are two types of discs, m and 12 cm, discrimination of the disc is difficult to be accurate due to weight and dimensional errors. Each time disc diameter (rotational moment of inertia) is judged, for example, first, a 12 cm disc is used. If it is determined that a small disc of 8 cm or less is loaded after kicking with the kick gain determined for the disc, the kick is again performed with the kick gain suitable for the small disc and the disc diameter (rotational moment of inertia) is detected. The detection error can be further improved.

[0040]

As described above, the disk device of the present invention
A spindle motor for mounting and rotating a disk, a spindle controller with a gain switching function for controlling the rotation of the spindle motor and having a control gain switching function, a spindle driver for driving the spindle motor according to a control signal, and a spindle A rotation speed detector for detecting the rotation speed of the motor, a rotation variation coefficient calculated based on the rotation command and the output of the rotation speed detector, and a corresponding gain optimum setting ratio determined to output a control gain switching command; Conventionally, it has a signal processor that controls the processing of the entire device, and sets the optimal control gain that matches the disk weight (moment of inertia) by starting the spindle motor and detecting the amount of rotation fluctuation. The same playability characteristics as those of the above can be secured and the disc weight (moment of inertia) It can drive the spindle main minimal current consumption, particularly those capable of providing an excellent disk driving method and a disk device capable of significantly reducing power consumption in a high-speed rotation mode.

[Brief description of the drawings]

FIG. 1 is a block diagram of a spindle control of a disk device according to an embodiment of the present invention.

FIG. 2 is a flowchart at the time of starting the disk device according to the embodiment of the present invention;

FIG. 3 is a diagram illustrating rotation fluctuation of a spindle motor.

FIG. 4 is a diagram showing a correspondence table between a rotation variation coefficient and a gain optimum setting ratio.

FIG. 5 is a flowchart of a two-stage determination.

FIG. 6 is a block diagram of a spindle control of a conventional disk drive.

FIG. 7 is a flowchart at the time of startup of a conventional disk device.

[Explanation of symbols]

 11, 21 Disk 12, 22 Spindle motor 13, 23 Spindle drive 14, 24 Spindle controller 15, 25 Signal processor 15a Amplification calculation means 16 Encoder 17 Revolution detector

Claims (4)

[Claims] 1. A rotation driving step of a disk mounted on a disk and rotationally driven by a predetermined driving force, a rotation control step of mounting the disk and rotation-controlled to a predetermined rotation speed by a predetermined servo control, and A rotational speed fluctuation calculating step of executing a driving step to detect a rotational speed and calculating a change in the rotational speed; and a control gain switching step of switching a control gain based on the rotational speed fluctuation calculating step, wherein the rotational driving step Executing the control gain switching step after executing the rotation speed fluctuation calculating step, and executing the disk rotation control step at a predetermined rotation speed. 2. A rotating means for mounting a disk and rotating by a predetermined driving force, a driving means for operating the rotating means in accordance with a signal for controlling the rotation, and a servo control of the rotating means at a predetermined number of rotations. Rotation control means for variably controlling the amplification degree of the servo amplification, a rotation number detection means for detecting the rotation number of the rotation means, and an amplification degree of the rotation control means based on a detection result of the rotation number detection means. Signal processing means for controlling, the signal processing means having amplification calculating means for calculating the amplification degree of the rotation control means based on a change in the rotation speed detected by the rotation speed detection means, Means for operating the rotation means for a predetermined time by means to control the amplification degree of the rotation control means in accordance with the calculation result of the amplification degree calculation means. 3. An amplification degree calculating means for calculating a change rate of a rotational speed, a rotation variation coefficient calculating means, and an optimal setting of the amplification degree in accordance with the change rate of the rotation number calculated by the rotation fluctuation coefficient calculating means. Amplification degree setting means for predetermining and storing a ratio, and based on the change rate of the rotational speed calculated by the rotation variation coefficient calculation means, referring to the amplification degree setting means, 3. The disk device according to claim 2, wherein an optimum setting ratio is obtained, and said amplification degree of said rotation control means is controlled in accordance with said optimum setting ratio. 4. The disk device according to claim 4, wherein the optimum setting ratio is set based on a plurality of calculations of the rate of change of the rotational speed.