JP2731673B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive provided with a motor for rotating a disk recording medium and a motor for moving a head, and more particularly to starting and accelerating a motor when a replaceable optical disk is mounted. The present invention relates to a disk device which performs initialization control during writing and sets a writable / readable state after reaching a specified speed.

An optical disk device has a very large storage capacity, and is expected to be effectively used as a large-capacity storage device of a computer system, and at the same time, to be downsized. Among them, it is desired that a replaceable optical disk device is limited in size and cost so as to eliminate the need for using a power supply having a large current capacity by limiting the maximum current consumption of the disk device.

[0003]

2. Description of the Related Art In a conventional optical disk drive capable of changing optical disks, when a medium such as an optical disk or a magneto-optical disk is changed by a loading mechanism while a motor is stopped, a spindle motor is controlled based on a detection signal of completion of loading. Start.

[0004] The spindle motor is, for example, 3600 rpm.
The rotation is started up to a constant speed, and after reaching the specified rotation, the light emission adjustment for adjusting the laser diode LD of the head so that the specified read power and write power can be obtained, and further, the objective lens is set within a predetermined range. To perform focus adjustment to pull in the focus servo by performing a search movement, and to perform writing / writing after the series of initialization adjustment processing is completed.
It is in a readable ready state.

However, if a series of initialization adjustment processes such as a laser diode light emission adjustment and a focus pull-in adjustment are performed after the medium reaches the specified rotation after the medium is replaced, writing / reading can be performed in a ready state. There is a problem that a processing time, which is obtained by adding the initialization processing time to the rise time of the motor rotation, is required, and the waiting time until ready becomes long.

In order to reduce the waiting time from the change of the medium to the ready state in which writing / reading is possible as much as possible, the inventors of the present invention adjusted the light emission of the laser diode during startup of the motor rotation. There has been proposed a disk device in which initialization control such as focus servo pull-in adjustment is performed (Japanese Patent Application Laid-Open No. 3-104020).

[0007]

However, in such a conventional disk drive, a voice coil motor (to be referred to as a motor hereinafter) for moving a head is included in initialization adjustment processing performed during motor rotation startup. "VCM")
Are simultaneously driven, and a control current of the VCM flows in addition to the control current of the spindle motor. Therefore, when the spindle motor and the VCM are simultaneously driven, a considerable current flows when viewed from the entire apparatus. For example, in the case of a 5-inch optical disk, the peak current reaches about 5A.

As a result, the peak value of the current consumption of the entire disk device becomes large, and it is necessary to use a power supply having a large current capacity, which hinders downsizing and cost reduction. Was. SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has as its object to provide a disk device capable of limiting a peak value of current consumption during initialization adjustment processing during a motor rotation start-up time. Aim.

Another object of the present invention is to provide a disk drive which suppresses the peak value of current consumption by limiting the drive current of one of the motors when two motors are simultaneously driven during initialization adjustment. Another object of the present invention is to limit the drive current of the medium rotation motor during acceleration and reduce the consumption current when the medium rotation motor and the head drive motor are driven simultaneously during initialization adjustment. Provided is a disk device that suppresses a peak value.

Another object of the present invention is to provide a disk drive that suppresses the peak value of current consumption by setting the drive current of a motor for rotating a medium to zero. Another object of the present invention is to provide a disk drive for suppressing the drive current by limiting the maximum value of the duty ratio control of the medium rotating motor. Another object of the present invention is to provide a disk device that suppresses a drive current by changing the sensitivity of a rotation detection signal in feedback ratio control of a medium rotation motor.

Another object of the present invention is to provide a disk drive which suppresses a drive current by changing a sensitivity so that a rotation detection signal in feedback ratio control of a medium rotation motor becomes larger than an actual rotation speed. Another object of the present invention is to provide a disk device that suppresses a drive current by converting a rotation detection signal in feedback ratio control of a medium rotation motor by multiplying by a coefficient so as to be larger than an actual rotation speed.

[0012]

FIG. 1 is a diagram illustrating the principle of the present invention. First, the present invention provides a spindle motor (first motor) 12 for rotating and driving the recording medium 10, a VCM (second motor) 16 for positioning and driving the head 14, a first motor control means 18 for controlling the spindle motor 12, ,
Second motor control means 20 for controlling the second motor 16,
At the start of use, the spindle motor 12 is started by the first motor control means 18, and after the recording medium 10 reaches a predetermined rotation speed, the VCM 16 is driven by the second motor control means 20 to move the head 14 to a desired position on the recording medium 10. And a disk control means 22 which enables writing or reading of information by moving to a predetermined position, and further performs an initialization for performing a predetermined initialization adjustment during a motor rotation rising time until the spindle motor 12 is started and reaches a predetermined speed. A disk device provided with the conversion control means 24 is targeted.

According to the present invention, when the VCM 16 is driven simultaneously with the spindle motor 12 during the initialization adjustment by the initialization control means 24,
It is characterized in that motor drive limiting means 26 for limiting the drive current of the spindle motor 12 is provided. Here, the motor drive limiting means 26 sets the drive current of the spindle motor 12 to zero, drives the spindle motor 12 with the drive current reduced to a predetermined value, and controls the duty ratio of the motor drive current.
If the maximum duty ratio is limited to a predetermined value, and if the motor drive current is under feedback control, the detection sensitivity of the detection signal indicating the motor drive current is increased,
A feedback of a detection signal indicating a higher drive current than the actual value. If the motor drive current is feedback-controlled, a current detection signal indicating the motor rotation speed is multiplied by one or more coefficients to detect a higher current value than the actual value. The drive current of the spindle motor 12 can be limited by either of the following:

In the actual initialization control, after the spindle motor 12 is started, the first specified rotation speed (2700 rpm)
m), and after a constant speed control at a first specified rotation speed for a predetermined time, a higher second specified rotation speed (54).
00 rpm), and thereafter, constant speed control for maintaining the second specified rotation speed is performed. During the acceleration control to the first specified speed, the head 14 is moved to the innermost medium information area outside the user area of the recording medium 10 by driving the VCM 16, and the head is moved at the first specified speed. During the speed control, the information recorded in advance in the medium information area is read, and during the acceleration control to the second specified speed rotation speed, the light emission is adjusted so that the output power of the laser diode becomes the read power,
After the light emission adjustment, the head 14 is moved to the user area by driving the VCM 16.

Therefore, the motor drive restricting means 26
The drive current of the spindle motor 12 is limited when the head 14 moves to the medium information area by the drive of 16 and when the head 14 moves from the medium information area to the user area.

[0016]

According to the disk device of the present invention having the above-described structure, when the replaceable recording medium 10 is mounted,
The spindle motor 12 is started, an initialization adjustment process is performed during the motor rotation rise until a predetermined rotation is reached and information can be written and read out.
When the CM 16 is driven, the spindle motor 12 is turned off, for example, so that the drive currents of the two motors do not simultaneously flow.

As a result, the peak value of the current consumption of the device can be limited, and a power source having a large current capacity is not required, and the size and cost of the device can be reduced.

[0018]

FIG. 2 is a block diagram showing an embodiment of the present invention, taking an optical disk apparatus as an example. In FIG.
Reference numeral 10 denotes an optical disk as a recording medium, for example, IS
An optical disk cartridge containing a standard 5-inch optical disk of O standard is used. When the optical disk cartridge is set in the optical disk device, it is mounted on a rotating shaft of a spindle motor 12 as a first motor by a loading mechanism (not shown).

The spindle motor 12 is controlled via a motor drive circuit 42 by a motor control unit 18 realized by program control of the MPU 22. That is, the spindle motor 12 is stopped in the loading state of the optical disk, and when the loading of the optical disk 10 is completed, a motor-on signal is output to the motor drive circuit 42 from the motor control unit 18 provided in the MPU 22 functioning as a logic controller. , The spindle motor 12 is started.

As the spindle motor 12, for example, a brushless DC motor is used, and the motor rotation is started up to a predetermined specified rotation speed, for example, 5400 rpm, and when the rotation reaches 5400 rpm, constant speed control is started. Specifically, a reference clock signal giving a rotation cycle of 5400 rpm is compared with an index signal for detecting the actual rotation of the spindle motor 12, and the motor drive current is set so that the delay or advance of the index signal with respect to the reference signal is zero. PWM control is performed.

FIG. 3 is a functional block diagram showing a specific example of the motor control unit 18 shown in FIG.
0, an addition point 52, a duty control unit 54, and a control unit 56. The target rotation speed setting unit 50 sets the target rotation speed N ₀ indicating, for example, 5400 rpm as the target rotation speed at the addition point 52, and extracts a deviation ΔN from the rotation detection signal N indicating the actual rotation of the spindle motor 12. Addition point 52
Is supplied to the duty control unit 54, and the duty ratio of the motor drive current is controlled so that the deviation ΔN becomes zero.

That is, if the deviation ΔN is a positive value, the on-duty of the motor drive current is reduced to reduce the total motor drive current, thereby reducing the rotation speed. When the deviation ΔN is a negative value, the on-duty of the motor drive current is increased to increase the total motor drive current and increase the rotation speed. As described above, the target rotation speed N ₀ in FIG.
A reference clock signal giving a rotation cycle of 00 rpm may be used, and the rotation detection signal N may be an index signal for detecting the actual rotation of the spindle motor 12.

Referring again to FIG. 2, an optical head 14 is provided for the optical disk 10. The optical head 14 is mounted on a carriage, and is moved in the radial direction of the optical disk 10 by a VCM 16 as a second motor. Further, a track actuator 32 and a focus actuator 34 are mounted on the optical head 14. The track actuator 32 can move the light beam in a radial direction within a range of a predetermined number of tracks. The focus actuator 34 moves an objective lens that irradiates a beam spot onto the disk surface in the optical axis direction, and performs focus control so that a specified minute spot on the disk surface is imaged.

The VCM 16 is controlled via a drive circuit 40 by a VCM control unit 20 provided in the MPU 22. The read signal from the optical head 14 is given to a servo signal creation circuit 36, and a focus error signal FES and a track error signal TES are created. Focus error signal FE
S is supplied to the focus servo circuit 30, and drives the focus actuator 26 so as to minimize the focus error signal FES.

The track error signal TES is supplied to the track servo circuit 38, and the track error signal TE
The track actuator 24 is driven so as to minimize S. The MPU 22 operates and deactivates the focus servo circuit 30 and the track servo circuit 38.
Controlled off. Further, the optical head 14 is provided with a laser diode, and the power of the laser diode is controlled by a light emission control circuit 28 so that the light emission amount is different for each of writing, erasing, and reading. The light emission amount of the laser diode is detected by a photodiode or the like provided in the optical head 14 and is fed back to the light emission control circuit 28. The light emission control circuit 28 controls the drive current of the laser diode so that the difference between the preset target light emission amount and the detected light emission amount is minimized.

Further, the read signal read from the optical head 14 is input to the pulse generating circuit 44, and is converted into a digital signal because the input signal is an analog signal. The read pulse obtained from the pulsing circuit is MPU2
2 and the read data is demodulated. A PEP bit detection circuit 46 is provided at the output stage of the pulsing circuit 44. Here, each data at the time of reading, writing, and erasing used for adjusting the light emission of the laser diode is stored in the optical disk 1
PEP (Phase Enc) as a medium information area of 0
Odd Part) zone, which is controlled for a predetermined time to a predetermined rotation speed, for example, a rotation speed of 2700 rpm, which is half of the final specified rotation speed of 5400 rpm, during the rise time of the motor rotation, and a constant speed rotation state of 2700 rpm Read the data in the PEP zone of the optical disk 10 and adjust the light emission of the laser diode based on the data for light emission adjustment obtained from the PEP read data.

FIG. 4 is an explanatory diagram of a recording area of an optical disk having a PEP zone. Referring to FIG.
Is provided with a user zone 58, and a track is formed in the user zone 58 in a spiral shape. A PEP zone 60 is formed inside the user zone 58. Further, two SFPs (Standard) are provided between the user zone 58 and the PEP zone and outside the user zone 58.
(Formed Part) zones 62 and 64 are formed. The SFP zone 64 is the inner SFP zone 62
Will be read when it cannot be read.

When the optical disk 10 is loaded on the disk device, first, the PEP zone 60 is read,
Next, the SFP zone 62 is read, and finally access to the user zone 58 is started. If the SFP zone 62 cannot be read, the outer SFP zone 64 is read. In the PEP zone 60, information necessary for reading the SFP zones 62 and 64 and the user zone 58, for example, the format format and modulation format of the optical disk, the number of bytes of user data in one sector, and reading when reading the SFP zones 62 and 64. The maximum power value equality is recorded. Also, the user zones 5 are stored in the SFP zones 62 and 64.
Information necessary for writing and reading of No. 8 is recorded, and of course, maximum limit values of read power, write power, and erase power necessary for light emission adjustment are recorded.

Further, the PEP zone 60 has a rotation speed 27 which is half the specified rotation speed of 5400 rpm for normal access.
Since the operation of reading the phase modulated data by the MPU 22 at 00 rpm is scheduled, the sector format differs from the user zone 58 and the SFP zones 62 and 64 as shown in FIGS. ing.

As a result, the read data of the PEP zone 60, the user zone 58, and the read data of the SFP zones 62 and 64 cannot be analyzed by the same circuit, and the read data of the PEP zone 60 is analyzed as shown in FIG. A dedicated PEP bit detection circuit 46 for processing is provided. Referring to FIG. 2 again, an inner sensor 48 is provided on the inner side of the optical disc 10. The inner sensor 48 detects the movement of the optical head 14 with respect to the PEP zone 60 shown in FIG. That is, the VCM control unit 20 of the MPU 22
Drives the VCM 16 until the detection output of the inner sensor 48 is obtained when the disk device starts up, and drives the optical head 14
Is moved to the inner side, and the optical head 14 is stopped at the detection position of the inner sensor 48 so that the PEP zone 60 can be read.

Since the PEP zone 60 and the SFP zones 62 and 64 are not spiral shaped like the tracks in the user zone 58 but are circular tracks having a width of 500 μm, tracking control during reading (kick operation) is performed.
Is unnecessary. Further, the MPU 22 is provided with an initialization control unit 24 and a motor drive control unit 26 as functions realized by program control. The initialization control unit 24 loads the optical disc 10 and starts the spindle motor 12, and drives the spindle motor 12 at a specified rotational speed of 5400 rpm.
Until the power is raised to m, initialization adjustment such as light emission adjustment and focus pull-in adjustment of the laser diode provided in the optical head 14 is performed. In the initialization adjustment, when the speed reaches 2700 rpm to read the PEP zone of the optical disk 10, the control is switched to the constant speed control. Therefore, the acceleration control of the spindle motor 12 is performed in two stages.

Further, the initialization control section 24 drives the VCM 16 to move the optical head 14 to the PEP zone of the optical disk 10, and further moves the optical head 14 from the PEP zone to the user zone after reading the PEP zone. The VCM 16 is driven to return. That is, the VCM 16 is driven twice during the initialization adjustment. The motor current limiting unit 26 simultaneously controls the VCM1 during the control by the initialization control unit 24.
When driving the motor 6, the driving of the spindle motor 12 is restricted. Specifically, the ON signal to the motor drive circuit 42 of the spindle motor 12 is switched off immediately before the drive of the VCM 16, and the drive current of the spindle motor 12 is set to zero while the VCM 16 is being driven.

FIG. 7 is a timing chart showing the operation of the embodiment shown in FIG. 2 when the motor starts rotating. FIG.
In, the loading with respect to the spindle motor 12 of the optical disk 10 is completed at time t ₁ to turn on the spindle motor 12, the first prescribed rotational speed 2700rpm
Perform acceleration control to start rotation toward.

The movement during acceleration due to activation of the spindle motor 12 is first subjected to light emission adjustment of the read power of the laser diode LD, the optical head 14 when the light emission adjustment of the read power is terminated to the PEP zone of the optical disk 10 at time t ₂ to turn on the VCM16 at time t ₃ to. Spindle motor 12 is turned off at time t ₂ immediately before turning on the VCM16 at this time t _3.

The optical head 14 starts moving in on the VCM 16 is a detection signal from the inner sensor 48 reaches the position of the inner sensor 48 is obtained, at time t ₄ off the VCM 16, the spindle at time t ₅ immediately thereafter The motor 12 is turned back on. For this reason, during the time t ₃ ~t ₄ is VCM1
6 is operating, the device current is reduced by the amount corresponding to the off-state of the spindle motor 12 to the current of the other circuit parts by VC
M16 current I _max1 next obtained by adding the, it can be suppressed greatly peak current than the current when driving the spindle motor 12 and VCM16 simultaneously.

The time t ₅ in turn on the spindle motor 12 and the focus servo circuit 30 and at the same time on again performs focus servo pull-in adjustments to draw the focus state of the objective lens. Then the rotation speed at time t ₆ and reaches the predetermined rotational speed 2700rpm enters the constant speed control. When the constant speed control is started, data reading of the PEP zone of the optical disk 10 is performed by the optical head 14.

When the data reading of the PEP zone is completed at time t ₇ , the control enters an acceleration control in which the spindle motor 12 is started to rotate to a final specified rotational speed of 5400 rpm. Simultaneously with the start of the acceleration control, the light emission of the laser diode LD is adjusted to the read power for reading the SFP zone based on the read data of the PEP zone.

When the read power emission adjustment is completed at time t ₈ , the VCM 16 is driven at time t ₉ to drive the optical head 14 to the PE.
Move from P zone to user zone side. At this time, V
CM16 off the spindle motor 12 at time t ₈ immediately before turning on the the driving current to zero. Therefore, the driving period VCM16 time t ₉ ~t _10, the driving current of the spindle motor 12 becomes zero, the device current I _max2 decreases by the amount that the zero current of the spindle motor 12, a sufficiently low value of the peak current Can be suppressed.

[0039] When turned off at time t ₁₀ VCM 16, raises the rotation by turning the spindle motor 12 again at time t ₁₁ immediately thereafter. At the same time, the focus servo circuit 30 is turned on to perform the focus servo pull-in operation. Subsequently, the rotation speed is 5400r, which is the final specified rotation speed.
Switch the spindle motor 12 in the constant speed control is reached at time t ₁₂ to pm, and on a track servo circuit 38 at the same time, lead is used in the user zone leading the SFP zone, last, after the light emission adjustment erase and turns on the ready signal indicating that it is now possible to write and read to the upper apparatus at time t _13.

FIGS. 8 and 9 are flowcharts showing the initialization control at the time of starting the rotation of the motor in the embodiment of FIG. In FIG. 8, when loading of the disk cassette into the disk device is completed, the spindle motor 12 is started in step S1. Subsequently, in step S2, the light emission of the read power of the laser diode LD is adjusted, and in step S3, the current flowing through the spindle motor 12 is turned off. Subsequently, in step S4, the optical head 14 is
The VCM 16 is driven for head access to the zone. At this time, since the driving current of the spindle motor 12 is zero, the peak value of the current consumption of the entire apparatus can be greatly reduced.

When the head access to the PEP zone is completed in step S4, that is, when the detection signal from the inner sensor 48 is obtained, the process proceeds to step S5, and the spindle motor 12 is turned on again. At this time, the track servo is turned off. Subsequently, in step S7, the arrival at the set value L ₀ = 2700 rpm, which is the constant speed target speed, is monitored.
When the rotation speed reaches 700 rpm, the control enters the constant speed control in step S8. In step S9, the PE in which the optical head is currently positioned is located.
The data of the P zone is read.

Subsequently, in step S10, the focus servo circuit 30 is turned off, and in step S11, acceleration control is started toward the high-speed target speed setting value Hi = 5400 rpm. During this acceleration control, the read power of the laser diode LD is adjusted in step S12 based on the read data of the PEP zone. Subsequently, the VCM 16 is driven to move the optical head 14 from the PEP zone to the user zone. Before driving the VCM 16, step S1 is performed.
In step 3, the spindle motor 12 is turned off.
At 14 the VCM 16 is turned on to move the optical head 14 to the user zone. When the movement of the optical head 14 to the user zone is completed, the focus servo circuit 30 is turned on in step S15, and the spindle motor 12 is turned on again in step S16 to start rotation.

Subsequently, the routine proceeds to step S17 in FIG. 9, and when the set value of the high-speed target speed Hi reaches 5400 rpm, the routine proceeds to constant speed control in step S18. Subsequently, in step S19, the track servo circuit 38 is turned on, and in step 20, SF
After reading the Pthorn and performing read, write, and erase light emission adjustments for the user zone in the manufacturer S21,
Finally, in step S22, the state shifts to a ready state in which reading and writing are possible.

Note that the timing chart of FIG.
In the process of the flowchart of FIG. 9, the PEP zone is read at a specified rotation speed of 2700 rpm during the rotation of the motor, read light emission is adjusted, and light emission is adjusted after reaching the next specified rotation speed of 5400 rpm. Although the SFP zone is read with the read power and the light emission of the read power, write power and erase power used for actual reading and writing is adjusted, 2700r
At a constant speed of pm, the read power is adjusted based on the reading of the PEP zone 60, and the read power, write power and erase power of the user zone are adjusted based on the reading of the SFP zone, and then the rotation is started at 5400 rpm. May be.

FIG. 10 is a functional block diagram showing an embodiment of the motor control unit 18 for realizing another current limitation by the motor current limitation unit 26 of FIG. In FIG.
Target rotation setting section 50, addition point 52, duty control section 5
In addition to the control unit 4 and the control unit 56, a sensitivity switching unit 66 is newly provided. Spindle motor 1 for sensitivity switch 66
2, a rotation detection signal N indicating the actual rotation speed is input. The coefficient K is given to the sensitivity switching unit 66 from the motor current limiting unit 26 shown in FIG. The sensitivity switching unit 66 outputs a detection signal (KN) obtained by multiplying the rotation detection signal N by the coefficient K to the addition point 52.

The current limiting section 26 can change the value of the coefficient K for the sensitivity switching section 66. That is, when there is no need to limit the current of the spindle motor 12, the coefficient K
= 1, and outputs the rotation detection signal N to the addition point 52 as it is. On the other hand, if it is desired to limit the current of the spindle motor 12, an appropriate value of 1 or more is set as the coefficient K. For example, a coefficient K = 2 is set.

Therefore, the rotation detection signal N is twice as large as KN = 2N, which means that the rotation detection sensitivity is improved. Therefore, the rotation speed KN = 2N higher than the actual detected rotation N is input to the addition point 52, and when the rotation speed reaches half the target rotation N ₀ , the deviation ΔN becomes zero and the constant speed control is started. Assuming that there is a proportional relationship between the rotational speed and the drive current, the drive current can be limited to K times, that is, 1/2. The limiting amount of the motor drive current can be limited to a smaller value by increasing the coefficient K.

As another embodiment for limiting the current of the spindle motor 12, the maximum value of the on-duty of the motor drive current controlled by the duty control unit 54 is limited by a signal from the motor current limit unit 26. May be. For example, if the maximum on-duty in the duty control unit 54 when the current of the spindle motor 12 does not need to be limited is 80%, the maximum value of the on-duty is required to limit the current by driving the VCM. It is limited from 80% to a lower value, for example, 40%.

If the maximum value of the on-duty is limited as described above, even if the deviation ΔN from the addition point 52 increases as a positive value, PWN control with an on-duty exceeding the limited 40% cannot be performed. The motor drive current saturates at the duty limit value, and can be suppressed to a drive current corresponding to the ON duty limit value.

Although the above embodiment has been described with respect to an example of a replaceable optical disk device as a recording medium, a non-replaceable optical disk device in which an optical disk is fixedly mounted on a spindle motor is also used. At the start, the present invention can be applied as it is. In addition, the present invention can be applied to any appropriate disk device such as a hard disk device and a floppy disk device as long as the initialization is performed at the time of starting the rotation of the motor, as well as the optical disk device.

[0051]

As described above, according to the present invention, in the initialization adjustment processing during motor rotation start-up,
When the driving of the spindle motor and the driving of the VCM are performed at the same time, the peak current of the entire apparatus can be greatly suppressed by limiting the current of the spindle motor, and a power supply having a large current capacity is not required. The size and the price can be reduced.

For example, in the case of an optical disk apparatus using a replaceable 5-inch disk cassette, a conventional apparatus in which the spindle motor and the VCM are simultaneously driven in the initialization adjustment processing during motor rotation start-up. , The peak current of about 5 A was consumed, but the peak current according to the present invention was about 3.5 A, which could be suppressed to 70% or less.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a functional block diagram showing a motor control unit of FIG. 2;

FIG. 4 is an explanatory diagram of a recording area of an optical disk.

FIG. 5 is an explanatory diagram of a sector format of a PEP zone in FIG. 4;

FIG. 6 is an explanatory diagram of a sector format of the user zone in FIG. 4;

FIG. 7 is a timing chart showing initialization control according to the embodiment of FIG. 2;

FIG. 8 is a flowchart showing initialization control according to the embodiment of FIG. 2;

FIG. 9 is a flowchart showing initialization control according to the embodiment of FIG. 2 (continued).

FIG. 10 is a functional block diagram showing another embodiment of the motor control unit of FIG. 2;

[Explanation of symbols]

 10: Recording medium (optical disk) 12: First motor (spindle motor) 14: Head (optical head) 16: Second motor (VCM; voice coil motor) 18: First motor control means (motor control unit) 20: First motor 2 Motor control unit (VCM control unit) 22: Disk control unit (MPU) 24: Initialization control unit (Initialization control unit) 26: Motor current limiting unit (Motor current limiting unit) 28: Light emission control circuit 30: Focus servo Circuit 32: Track actuator 34: Focus actuator 36: Servo signal creation circuit 38: Track servo circuit 40: VCM drive circuit 42: Motor drive circuit 44: Pulsing circuit 46: PEP bit detection circuit 48: Inner sensor 50: Target rotation setting Part 52: addition point 54: duty control part 56: control part 58: user Zazon 60: PEP zone 62,64: SFP zone 66: sensitivity switching unit

Claims (16)

(57) [Claims] A first motor for rotating and driving a recording medium; and a second motor for positioning and driving a head.
A first motor control means (18) for controlling the first motor (12); a second motor control means (20) for controlling the second motor (16); The first motor (12) is started by means (18), and after the recording medium (10) reaches a predetermined rotation speed, the second motor control means (2) is started.
0) to drive the second motor (16) to drive the head (1).
Disk control means (22) for moving 4) to a desired position on the recording medium (10) to enable writing or reading of information;
An initialization control unit (24) for performing a predetermined initialization adjustment during a motor rotation rising period until the first motor (12) is activated and reaches a predetermined speed; and the initialization control unit (24). When the second motor (16) is driven simultaneously with the first motor (12) during the initialization adjustment according to (1), a motor drive restricting means (26) for restricting the driving of the first motor (12) is provided. A disk device characterized by the above-mentioned. 2. A disk drive according to claim 1, wherein said motor drive restricting means (26) drives the second motor (16) simultaneously with said first motor (12) during initialization adjustment. A drive current of the first motor (12) is reduced to zero while the disk drive is in operation. 3. The disk drive according to claim 1, wherein said motor drive restricting means (26) drives the second motor (16) simultaneously with said first motor (12) during initialization adjustment. While the drive is in operation, the drive current of the first motor (12) is reduced to a predetermined value to drive the disk drive. 4. A disk drive according to claim 1, wherein said first motor control means (18) calculates a deviation between a target setting signal indicating a target rotation speed and a detection signal indicating a rotation speed of the first motor. Duty ratio control means for controlling the duty ratio of the motor drive current so as to be zero, wherein the motor drive limiting means (26) simultaneously performs the first motor (12) and the second motor (16) during initialization adjustment. A) the drive current of the first motor is suppressed by restricting the maximum duty ratio of the motor drive current controlled by the duty ratio control means to a predetermined value while the drive is performed. 5. The disk drive according to claim 1, wherein the first motor control means (18) is configured to determine a deviation between a target setting signal for determining a target rotation speed and a current detection signal indicating the rotation speed of the first motor. The motor drive limiting means (26) controls the motor drive current so as to make zero the first motor (1) during the initialization adjustment.
2) While driving the second motor (16) at the same time,
A disk device for limiting the drive current of the first motor by increasing the sensitivity of a circuit for detecting a detection signal indicating the drive current of the first motor and feeding back a detection signal indicating a drive current higher than the actual drive current. . 6. A disk drive according to claim 1, wherein said first motor control means (18) calculates a deviation between a target setting signal for determining a target rotation speed and a detection signal indicating the rotation speed of the first motor. Feedback control means for controlling a motor drive current to be zero; the motor drive restriction means (26) controls the first motor (12) during initialization adjustment;
At the same time, while the second motor (16) is being driven, the detection signal indicating the rotation speed of the first motor is multiplied by one or more coefficients to convert the detection signal to a detection signal indicating a rotation speed higher than the actual rotation speed and feed back. A drive current for the first motor. 7. The disk drive according to claim 6, wherein the feedback control means sets a deviation between a target setting signal indicating a target rotation speed and a detection signal indicating a rotation speed of the first motor to zero. A disk device as a duty ratio control means for controlling a duty ratio of a motor drive current. 8. The disk drive according to claim 1, wherein said initialization control means (24) activates said first motor (12) by said first motor control means (18) for a first specified rotation. After performing the acceleration control to the speed, the constant speed control at the first specified rotation speed for a predetermined time, the acceleration control to a higher second specified rotation speed, and thereafter, the constant speed control to maintain the second specified rotation speed. A disk device characterized by performing. 9. The disk drive according to claim 8, wherein said initialization control means (24) controls said second motor control during acceleration control to a first specified speed by said first motor (12). By driving the second motor (16) by means (20), the head (14) is moved to a medium information area outside the user area of the recording medium (10), and a constant speed control at a first specified rotation speed is performed. While the disk control means (22) reads the information recorded in advance in the medium information area during the acceleration control to the second specified rotational speed so as to obtain the write power obtained from the read information. A disk device, which adjusts light emission of a laser diode, and moves the head (14) to a user area by driving the second motor (16) after the light emission adjustment. 10. The disk device according to claim 9, wherein
The motor drive restricting means (26) controls the first motor (12) when the head (14) is moved to the medium information area and when the head (14) is moved from the medium information area to the user area by driving the second motor (16). A disk drive characterized in that the drive current of the disk drive is limited. 11. The disk drive according to claim 9, wherein:
Prior to reading the medium information area, the initialization control means (24) turns on the focus servo means to turn on the head (1).
4) A disk device for controlling the focusing of the objective lens. 12. A disk drive according to claim 9, wherein:
The initialization control means (24) turns on the focus servo means after moving the head from the medium information area to the user area, controls the focus of the objective lens of the head (14), and further sets the rotation speed to the second specified rotational speed. A disk device which, when reached, issues a ready signal in a state where the tracking servo means is turned on and the head (14) is controlled to follow the track of the recording medium (10). 13. The disk device according to claim 1, wherein
A disk drive characterized in that the first motor (12) is started by the motor control means (18) when the loading of the recording medium (10) is completed. 14. A disk drive according to claim 1, wherein:
A disk device using at least an optically readable optical disk as a recording medium (10). 15. The disk drive according to claim 1, wherein
A disk device using an optical disk that can be read and written optically as a recording medium (10). 16. A disk drive according to claim 1, wherein:
The disk device according to claim 1, wherein the first motor (12) is a spindle motor, and the second motor (16) is a voice coil motor.