JP2000260126A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time required to start sounding by inhibiting the driving stop of a spindle motor for a fixed time after a user operates the device and immediately storing data in a shock-proof memory without waiting the activation of the spindle motor when the user performs operation such as access designation again. SOLUTION: In this disk reproducing device, a spindle motor 102 is ordinarily stopped for a sleep term and when there is the operation of the user from an operation input part 114, the stop of the spindle motor 102 is inhibited for following fixed time by a system control means 113 while using a timer means 116 so that the user can quickly access the designated track of a disk 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus such as a mini disc.

[0002]

2. Description of the Related Art A first conventional example of a disk reproducing apparatus will be described below with reference to FIGS.
In this conventional example, a mini disk system will be described as an example. The configuration of the mini disk system is described in Nikkei Electronics No. 535, 1991.9.2, pages 127 to 141.

FIG. 9 shows a configuration of a conventional example of a disk reproducing apparatus. In FIG. 9, a disk 101 is a magneto-optical disk or an optical disk. Spindle motor 102
Is a spindle motor for rotating the disk 101,
Driven by a servo unit 106 via a motor driver 105. The signal recorded on the disk 101 is read by the optical pickup 103 and supplied to the reproduction amplifier 107. The optical pickup 103 includes the motor driver 10
5 is driven by the servo unit 106. The position of the optical pickup 103 on the disk is controlled by a traverse motor 104. The traverse motor 104 is connected to the servo unit 10 via a motor driver 105.
6 driven.

[0004] The reproduction amplifier 107 includes an optical pickup 103.
The current-to-voltage conversion is performed on the reproduced signal reproduced in step (1), the waveform is equalized, and the resulting signal is supplied to the signal demodulation unit 108. The reproduction amplifier 107
Supplies a signal demodulation unit 108 with current-voltage conversion of an ADIP (Address Implement Groove) signal reproduced by the optical pickup 103. A method of separating a reproduction signal and an ADIP signal from an optical pickup is described in Nikkei Electronics No. 535, 1991.9.2 No. 127-
It is published on page 141. Also, the reproduction amplifier 107
After current-voltage conversion of the signal reproduced by the optical pickup 103, a signal for servo is generated and supplied to the servo unit 106.

[0005] The signal demodulation unit 108 includes a system control unit 11.
When 3 instructs demodulation, a clock is extracted from the reproduction signal supplied from the reproduction amplifier 107, data is detected based on the extracted clock, and EFM (8-14 modulation) modulated data is demodulated. Clock extraction is performed by PLL (Ph
ase Locked Loop) circuit. Thereafter, the signal demodulation unit 108 detects the frame synchronization signal, performs error correction using the error correction code included in the demodulated data,
The corrected data is sent to the shock proof memory 109. The signal demodulation unit 108 also outputs the frame clock (about 7.35 kHz) detected during demodulation to the servo unit 10.
6 The frame clock is a clock having the same frequency as the reproduced frame, and is generated by the signal demodulation unit 108 based on the frame synchronization signal. Also, the signal demodulation unit 108 controls the ADI recorded on the magneto-optical disk.
The P signal is demodulated, a bit clock is generated, and the servo unit 1
06, and detects an address signal recorded in ADIP and sends it to the system control unit 113. The shock proof memory 109 includes the signal demodulation unit 10
8 is a memory for storing corrected data output from the memory 8. T
The OC memory 115 is a memory that stores a set of a track (music) head address of a track read out by the signal demodulation unit 108 and recorded on a disk.

[0006] The servo unit 106 controls the rotation speed of the disk 101 in accordance with the frame clock supplied from the demodulation unit 109 during reproduction of the optical disk. Servo unit 106
Controls the rotation speed of the disk 101 by the bit clock of the ADIP signal generated by the demodulation unit 108 during reproduction or recording of the magneto-optical disk.

[0007] The memory control unit 110, based on the amount of data stored in the shockproof memory 109, when the amount of data stored in the shockproof memory 109 reaches the upper limit of the memory capacity, the memory full flag M
F is set, and when the data amount becomes equal to or less than (the upper limit of the memory capacity−4 sectors), the memory full flag MF is released.

The memory control unit 110 sets a memory empty flag ME when the amount of data stored in the shock proof memory 109 reaches 0, and sets a memory empty flag ME when the amount of data exceeds 4 sectors. To release.

The system control unit 113 includes a memory full flag MF supplied from the memory control unit 110 according to a system mode (recording mode or reproduction mode),
Based on the memory empty flag ME, the servo unit 10
6. The control of the signal demodulation unit 108, the memory control unit 110, and the audio decompression unit 111 is performed.

The voice expanding section 111 is a data reading section for reading data from the shock proof memory 109.
When the system control unit 113 instructs the reproduction mode, data is read from the shock proof memory 109 at a constant rate, and the compressed audio data is expanded. As a result, 16-bit data for two channels is output at a rate of 44.1 kHz for each channel. This data is D
Via an AC (digital-to-analog converter) 112,
It is output as an audio output signal for two channels.

[0011] The operation input unit 114 is a part for receiving instructions such as start of reproduction by the user and access to the head of a specific track, and sends these instructions to the system control unit 113.

Next, the operation of the conventional disk reproducing apparatus will be described with reference to the drawings. FIG. 10 is a timing chart showing the operation of the conventional disk reproducing apparatus. In FIG. 10, MS indicates the data storage state of the shock proof memory 109, and the full on the vertical axis indicates the state where the shock proof memory 109 is full, and (full-
M) indicates that the free space of the shock proof memory 109 is M
(M = 4) states of sectors, and (empty + N) indicates a state in which data of N (N = 4) sectors is stored in the shock proof memory 109. Empty indicates that the shock proof memory 109 is empty.

MF is a memory full flag sent by the memory control unit 110. The memory control unit 110 sets a memory full flag MF when the amount of data stored in the shock proof memory 109 is full, and sets a memory when the free space of the shock proof memory 109 becomes M (M = 4) sectors. The full flag MF is cleared. The horizontal axis indicates the passage of time.

When playback is instructed by the operation input unit 114, playback starts at a constant rate X from time when the shock proof memory 109 is empty at time A, and the shock proof memory 109 becomes full at time B. System control unit 1
13 indicates that when the memory full flag MF is turned on at time B, the signal
Writing of corrected data to 9 is prohibited. That is,
The flag DEMEN indicating signal demodulation and the data transfer instruction SPMWE to the shock proof memory 109 are turned off.

At time B, the system control unit 113 prohibits writing of corrected data from the signal demodulation unit 108 to the shockproof memory 109, and then instructs the servo unit 106 to perform a track jump to the next sector. Normally,
By the time B, the access to the next sector of the shock proof memory 109 is instructed. When the access is completed, the tracking signal TRON supplied from the servo unit 106 to the system control unit 113 turns ON.

Thereafter, data is not written into the shock proof memory 109 until time C. The audio expansion unit 111 reads data from the shock proof memory 109 at a rate of X / 5.

Next, at time C, the shock-proof memory 1
When the data amount of 09 becomes (full-M), the system control unit 113 turns on DEMEN.

Next, the system control unit 113 compares the ADIP address sent from the signal demodulation unit 108 with the signal demodulation unit 1.
After confirming that the address data transmitted from the address 08 is the address indicating the sector immediately before the sector to be taken in next, the data transfer command is sent to the signal demodulation unit 108 at time D.
SPMWEN is activated and data transfer to the shock proof memory 109 is instructed.

Next, when the memory full flag MF is turned on at time E, the writing of corrected data from the signal demodulation unit 108 to the shock proof memory 109 is prohibited. Thereafter, the system control unit 113 repeats the same processing as that from time B to time E.

By performing the above control, the normal (full-M) data is stored in the shockproof memory 109.
Even if the above corrected data is stored and demodulation cannot be performed due to vibration or the like, voice expansion processing can be continued using the corrected data in the shock proof memory 109, so that a system with high seismic performance can be realized. Can be.

On the other hand, in the case of a mini-disc, the demand is high even for a portable because the disc is small. In portable disk reproducing devices, the length of battery life is very important for ease of use, and it is necessary to reduce the power of the reproducing device in order to extend the battery life.

As described in the first prior art example, the mini disc system employs a system in which reproduction is performed intermittently and data is stored in the shock proof memory 109.
When the reproduction is not performed, the reproduction system block before the shock proof memory 109 does not need to operate. That is, the rotation of the disk 101 may be stopped during the period in which reproduction is stopped and data is read from the shock proof memory 109 only. Taking advantage of such characteristics of the mini disc, the spindle motor 102
A disk reproducing apparatus capable of stopping the driving of the optical disk and reducing power consumption is disclosed in Japanese Patent Application No. 9-310288, entitled "optical disk reproducing apparatus".

[0023]

However, in the disk reproducing apparatus as in the above-mentioned conventional example, the drive of the spindle motor 102 happens to be stopped and the rotation of the spindle motor 102 is stopped or stopped in order to reduce power consumption. If the user gives an instruction to access another track from the currently playing track while the number is decreasing, it is not possible to use the data stored in the shock proof memory 109 until then. Unable to access the newly designated track by driving the servo unit 106,
Since it is necessary to load desired data into the shock proof memory 109, the sound of the sound of the track after skipping may be delayed.

The present invention solves the above-mentioned conventional problems, in which the stop of the driving of the spindle motor is prohibited for a certain period after the user performs the operation, and the user again performs an operation such as an access instruction. The object of the present invention is to provide a disk reproducing apparatus capable of immediately accumulating data in a shock-proof memory without waiting for the start of a spindle motor when performing the operation, and shortening the time until sound generation. I do.

Further, the present invention is generally applied to a case where the user instructs to access another track from the currently reproduced track while the rotation of the spindle motor is stopped or the number of rotations is decreasing. By starting playback at a rotation speed lower than the rotation speed of the spindle motor corresponding to the linear speed of, the startup time of the spindle motor is reduced,
It is an object of the present invention to provide a disk reproducing apparatus capable of immediately storing data in a shock-proof memory and shortening the time until sound generation.

[0026]

According to a first aspect of the present invention, there is provided a disk reproducing apparatus comprising: a spindle motor for rotating a disk; a pickup for reproducing a signal from the disk; a traverse motor for transferring the pickup; a spindle motor; A servo unit for controlling the traverse motor, a signal demodulation unit for demodulating a signal reproduced from the pickup, a shock-proof memory for storing data demodulated by the signal demodulation unit, and a memory control unit for controlling the shock-proof memory, A data reading unit for reading data from the shock proof memory, an operation input unit for instructing an operation by a user, and a servo unit, a signal demodulation unit, and a memory control unit based on an input from the operation input unit. System that outputs an operation input flag when there is an input from the operation unit. A control unit, and timer means for outputting an operation input period flag until a predetermined time elapses after receiving the operation input flag sent from the system control unit.The system control unit includes a servo unit, a signal After the demodulation unit and the memory control unit are controlled to store a predetermined amount of data on the disk in the shock proof memory, if the operation input period flag is not set, the drive of the spindle motor is stopped and the operation input is stopped. The drive of the spindle motor is not stopped when the period flag is set, and then, when the remaining amount of data in the shock proof memory becomes equal to or less than a predetermined amount, the spindle motor is stopped or the rotation speed corresponding to a predetermined linear speed or less. Is turned on, the spindle motor is started, the data on the disk is stored in the shock-proof memory, When Rumota is in speed corresponding to the predetermined linear velocity is characterized in that immediately start storing the shock-proof memory of the data on the disk.

According to the first aspect of the present invention, the stop of the driving of the spindle motor is prohibited for a certain period after the user performs the operation, and the user can again give an access instruction or the like within the certain period. When the above operation is performed, the data can be immediately stored in the shock proof memory without waiting for the activation of the spindle motor, and the time until sound generation can be reduced.

According to a second aspect of the present invention, there is provided a disk reproducing apparatus comprising: a spindle motor for rotating a disk; a pickup for reproducing a signal from the disk; a traverse motor for transferring the pickup; a spindle motor; and a servo for controlling the pickup and the traverse motor. Unit, a signal demodulation unit for demodulating a signal reproduced from the pickup, a shock proof memory for storing data demodulated by the signal demodulation unit, a memory control unit for controlling the shock proof memory, and a data for the shock proof memory. A data reading unit to be read, an operation input unit for a user to instruct an operation, and a servo unit, a signal demodulation unit, and a memory control unit are controlled based on an input from the operation input unit. A system control unit that outputs an operation input flag when an A timer means for outputting an operation input period flag until a predetermined time elapses after receiving the operation input flag sent by the system control unit, wherein the system control unit includes a servo unit, a signal demodulation unit, and a memory. After controlling the control unit and storing a predetermined amount of data on the disk in the shock proof memory, when the operation input period flag is not set, the drive of the spindle motor is stopped,
The drive of the spindle motor is not stopped when the operation input period flag is set, and then when the track input is instructed from the operation input unit, the spindle motor is stopped.
Or, when the rotation speed is equal to or less than the predetermined linear velocity, after starting the spindle motor, the storage of the data on the disk to the shockproof memory is started,
When the number of revolutions of the spindle motor has reached a predetermined linear speed, storage of data on the disk in the shockproof memory is started immediately.

According to the disk reproducing apparatus of the second aspect, when the spindle motor is stopped or when the track input is issued from the operation input unit at a rotation speed at which the linear velocity becomes lower than a predetermined value, the spindle motor is rotated. The servo unit, the signal demodulation unit, and the memory control unit are controlled by the rotation speed of the spindle motor at which the linear velocity becomes lower than that during normal reproduction, and the data on the disk is transferred to the shockproof memory. By configuring to start storing,
If the user instructs to skip from the currently playing track to another track while the rotation of the spindle motor is stopped or the number of rotations is decreasing, the spindle motor corresponding to the normal linear velocity By starting reproduction at a rotation speed lower than the rotation speed, the start-up time of the spindle motor can be shortened, data can be immediately stored in the shock proof memory, and the time until sound generation can be shortened.

According to the third aspect of the present invention, there is provided a disk drive according to the first aspect.
The system control unit according to claim 2, wherein the system control unit controls the servo unit, the signal demodulation unit, and the memory control unit to store a predetermined amount of data on the disk in the shock proof memory, and then controls the servo unit, When the operation of the demodulation unit is stopped and the remaining amount of data in the shock proof memory becomes equal to or less than a predetermined amount, the operations of the servo unit and the signal demodulation unit are started,
The storage of the data on the disk in the shockproof memory is started.

According to the disk device of the third aspect, the same effects as those of the first or second aspect can be obtained.

According to a fourth aspect of the present invention, there is provided a disk drive, comprising: a spindle motor for rotating the disk; a pickup for reproducing a signal from the disk; a traverse motor for transferring the pickup; a spindle motor; and a servo unit for controlling the pickup and the traverse motor. A signal demodulator for demodulating a signal reproduced from the pickup, a shock proof memory for storing data demodulated by the signal demodulator, a memory controller for controlling the shock proof memory, and reading data from the shock proof memory A data readout unit, an operation input unit for a user to instruct an operation, and a servo unit based on an input from the operation input unit.
The system control unit controls a signal demodulation unit and a memory control unit. When an access instruction is issued, the spindle motor is started via the servo unit, and the servo unit, the signal demodulation unit, and the memory control unit are operated at the rotation speed of the spindle motor at a linear velocity lower than that during normal reproduction. The storage of the data on the disk in the shock proof memory is started under control.

According to the disk device of the fourth aspect, at the time of access, the reproduction is started as soon as possible immediately after the start of the spindle motor, thereby shortening the time until the data is started to be loaded into the shock proof memory. As a result, it is possible to reduce a delay in starting sound reproduction after access.

According to a fifth aspect of the present invention, there is provided a disk drive, comprising: a spindle motor for rotating the disk; a pickup for reproducing a signal from the disk; a traverse motor for transferring the pickup; a spindle motor; and a servo unit for controlling the pickup and the traverse motor. A signal demodulator for demodulating a signal reproduced from the pickup, a shock proof memory for storing data demodulated by the signal demodulator, a memory controller for controlling the shock proof memory, and reading data from the shock proof memory A data readout unit, an operation input unit for a user to instruct an operation, and a servo unit based on an input from the operation input unit.
A signal control unit that controls the signal demodulation unit and the memory control unit, wherein the system control unit determines that the remaining amount of data in the shock proof memory is less than or equal to a predetermined amount when the spindle motor is stopped or in a free-run state. When the spindle motor is started via the servo unit, the signal demodulation unit and the memory control unit are controlled to start storing data on the disk in the shock proof memory, and thereafter, the servo unit, the signal demodulation unit And controlling the memory controller to increase the rotation speed of the spindle motor until the rotation speed reaches a predetermined linear speed or a predetermined rotation speed of the spindle motor.

According to the disk device of the fifth aspect, by starting the reproduction as soon as possible immediately after the start of the spindle motor, the time required to start loading the data into the shock proof memory can be shortened. As a result, it is possible to reduce the delay of the sound reproduction start after the access, and since the start of the reproduction, the reproduction period can be shortened by increasing the rotation speed of the spindle motor. ,
The average power consumption of the servo unit and the optical pickup can be reduced.

According to a sixth aspect of the present invention, there is provided a disk device, wherein a spindle motor for rotating the disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, a spindle motor, and a servo unit for controlling the pickup and the traverse motor. A signal demodulator for demodulating a signal reproduced from the pickup, a shock proof memory for storing data demodulated by the signal demodulator, a memory controller for controlling the shock proof memory, and reading data from the shock proof memory A data readout unit, an operation input unit for a user to instruct an operation, and a servo unit based on an input from the operation input unit.
A signal control unit for controlling a signal demodulation unit and a memory control unit, wherein the system control unit controls the spindle motor via a servo unit when a track access instruction is issued when the spindle motor is stopped or in a free-run state. The spindle motor is started, the signal demodulation unit and the memory control unit are controlled to start storing the data on the disk in the shock-proof memory, and then the servo unit, the signal demodulation unit and the memory control unit are started. Under control, the rotation speed of the spindle motor is increased until a predetermined linear speed or a predetermined spindle motor rotation speed is reached.

According to the disk device of the sixth aspect, at the time of access, the reproduction is started as soon as possible immediately after the start of the spindle motor, thereby shortening the time until the data is started to be loaded into the shockproof memory. As a result, it is possible to shorten the delay of the sound reproduction start after access, and to shorten the reproduction period by increasing the rotation speed of the spindle motor after the reproduction start, so that the reproduction amplifier, The average power consumption of the signal demodulation unit, the servo unit, and the optical pickup can be reduced.

According to a seventh aspect of the present invention, there is provided a disk device, wherein a spindle motor for rotating the disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, a spindle motor, and a servo unit for controlling the pickup and the traverse motor. A signal demodulator for demodulating a signal reproduced from the pickup, a shock proof memory for storing data demodulated by the signal demodulator, a memory controller for controlling the shock proof memory, and reading data from the shock proof memory A data readout unit, an operation input unit for a user to instruct an operation, and a servo unit based on an input from the operation input unit.
The system control unit controls a signal demodulation unit and a memory control unit.The system control unit activates the spindle motor via the servo unit when the spindle motor is stopped or in a free-run state. Output address O
After the K flag becomes OK, the signal control section controls the signal demodulation section and the memory control section to start storing the data on the disk in the shockproof memory, and thereafter, the servo section, the signal demodulation section, and the memory control section. And controlling the rotation speed of the spindle motor until a predetermined linear velocity or a predetermined rotation speed of the spindle motor is reached.

According to the disk device of the seventh aspect, the same effects as those of the sixth aspect are obtained.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. According to the first embodiment of the present invention, the stop of the driving of the spindle motor is prohibited for a certain period after the user performs an operation, and the user performs an operation such as an access instruction again within a certain period. In this case, it is possible to immediately accumulate data in the shock proof memory without waiting for the start of the spindle motor, thereby shortening the time until sound generation.

FIG. 1 shows the configuration of a disk reproducing apparatus according to the first embodiment of the present invention. The difference between FIG. 1 and FIG. 9 showing the configuration of the conventional example is the addition of the timer means 116 and the change of the operation of the system control unit 113. The other parts are the same as in FIG. 9 and will not be described.

In FIG. 1, a timer means 116 outputs an operation input period flag from when the operation input flag transmitted by the system control unit 113 is received until a predetermined time elapses.

FIG. 3 shows the structure of the timer means. Upon receiving the operation input flag KEY output from the system control unit 113, the timer unit 116
Has a function of setting an operation period flag OPF for a certain period based on the count initial value DATA set from the step (b).

In FIG. 3, the clock generation unit 503
Generate a clock with a period of 0.25 seconds. The RS flip-flop 501 is set by the operation input flag KEY output from the system control unit 113, and is reset by the overflow flag OVF output by the counter 502. The counter 502 loads the load data DATA sent from the system control unit 113 when the output of the RS flip-flop 501 is “0”, counts up by the clock CLOCK at other times, and overflows the overflow flag O when it reaches 255.
This is an 8-bit binary counter with a load function that outputs VF.

Therefore, when the operation input flag KEY is input to the counter 502, the RS flip-flop 501 is set.
1 ”and starts counting up.
When it reaches 5 and overflows, the overflow flag OVF rises, the operation period flag OPF becomes “0”, and the counter 502 is loaded with the load data DATA sent from the system control unit 113. For example, when DATA is “0”, the counter 502 overflows after counting up 256 times after the input of the operation input flag KEY. That is, the operation period flag OPF is 256 times the cycle (0.25 seconds) of the clock CLOCK after the operation input flag KEY is input.
In the double period (64 seconds), it becomes "1" and then returns to "0".

The system control unit 113 includes the timer unit 11
6 while the operation period flag OPF is set, the servo unit
Prohibition of suspension.

Next, the operation of the first embodiment of the present invention will be described. FIG. 4 is a flowchart showing an operation at the time of reproduction of the system control unit 113 according to the first embodiment of the present invention. In FIG. 4, a process 601 is performed by the timer 11
6 shows a process of setting an initial value DATA of 6 to 0. Processing 6
02 indicates a process that branches to a process 609 when a track access instruction is given from the operation input unit 114, and otherwise branches to a process 603.

The process 603 is performed in the shock proof memory 1
When the remaining data amount of the data 09 is equal to or more than the lower limit L (empty + N) and equal to or less than the upper limit U (full-M), the process branches to the process 604, and otherwise, the process branches to the process 602.

The process 604 is performed in the shock proof memory 1
When the remaining data amount of the data 09 is equal to or larger than the upper limit U, the process branches to the process 605, and otherwise, the process branches to the process 611.

The process 605 is a process for instructing the reproduction amplifier 107 and the signal demodulation unit 108 to stop reproduction.

The process 606 is performed for the servo unit 106.
PU servo (focus servo, tracking servo,
4 shows a process of instructing the stop of traverse servo).

In step 607, the operation period flag OPF is set to 1
If, the process branches to process 608; otherwise, process 6
The process of branching to 02 is shown.

The process 608 is performed for the servo unit 106.
Instructs the spindle servo to stop, and the spindle motor 1
02 shows a process for making the free run.

Step 609 is for the servo unit 106
PU servo (focus servo, tracking servo,
Traverse servo).

The process 610 is performed for the servo unit 106.
The process of instructing to access the track specified from the operation input unit 114 will be described.

The process 611 is performed for the servo unit 106.
PU servo (focus servo, tracking servo,
Traverse servo).

The process 612 is a process for instructing the servo unit 106 to start the spindle motor 102 and apply CLV (constant linear velocity) spindle servo.

The process 613 indicates a process of branching to the process 614 when the CLV servo lock signal sent from the servo unit 106 is 1, and a process of branching to the process 613 otherwise.

Step 614 is a process for instructing the reproduction amplifier 107 and the signal demodulation unit 108 to start reproduction.

FIG. 2 is a timing chart showing the operation of the first embodiment of the present invention. In FIG.
(1) KEY indicates an operation input flag output from the system control unit 113 via the operation input unit 114 when a user operates a key. (2) OVF indicates an overflow flag OVF which is set when the counter 502 in the timer means 116 overflows. (3) OPF
Indicates an operation period flag OPF which outputs "1" for a period of 64 seconds after the operation input flag KEY is raised.
(4) SPDL indicates the rotation speed of the spindle motor 102. (5) DEM indicates that the reproduction amplifier 107 and the signal demodulation unit 108 are operating. (6) SRV is
Indicates the operation mode of the servo. (7) Indicates audio output from the DAC 112. M indicates a mute period, and track N (N = 1, 2, 3) indicates that sound recorded on track N is being reproduced.

In the period A of FIG. 2, the operation period flag OPF =
0 indicates a normal reproduction state in which the reproduction data is intermittently written to the shock proof memory 109 in accordance with the data amount of the shock proof memory 109. At this time, the process of the system control unit 113 , Processing 6
02, 603, and 604 and the processes 605, 606, and 607 or the processes 611, 612, 613, and 614 are repeated.

In period A, periods 416 and 417,
The servo unit 106 performs CLV (constant linear velocity) control according to an instruction (process 612) from the system control unit 113.
In FIG. 2, reference numerals 403 and 406 denote states in which the spindle motor 102 is started to increase the rotation speed so that the servo unit 106 starts intermittent reproduction.
(Constant linear velocity) Control, 405, 40
8 shows a state where the CLV control is stopped and the spindle motor 102 is in a free run.

The reproduction amplifier 107 and the signal demodulation unit 10
8 is in the reproducing operation state for the periods 412 and 413 according to the instruction (process 614) of the system control unit 113, and stores the data in the shock proof memory 109. On the other hand, the audio decompression unit 111 continuously reads data from the shock proof memory 109, supplies the data to the DA converter 112, and outputs an audio signal.

Therefore, in the normal reproduction state, the spindle motor 102, the servo unit 106, the reproduction amplifier 107
Thus, the signal demodulation unit 108 has been halted for most of the period, and power consumption during this period can be saved.

In FIG. 2, period B indicates the period of access to track 3, and period C indicates the period of access to track 5. At timing 400, the operation input flag KEY for the first key operation “access the third track and start reproduction” is set, and at timing 401, 2
An operation input flag KEY for the fifth key operation "accessing the fifth track and starting reproduction" is set.

The timer means 116 has an operation input flag KE
After Y rises, the operation period flag OPF is set for 64 seconds. Since the period B is 40 seconds, the operation period flag OPF continues to rise until the timing 401,
At 1, the operation input flag KEY rises again, and 64 seconds after that, the operation period flag OPF falls.

Since the system control unit 113 does not execute the process 608 while the operation period flag is set in the judgment of the process 607, the system control unit 113 does not stop the spindle motor 102 for the servo unit 106. As a result, period B and period C
During this time, the spindle motor 102 continues to rotate.

At timing 400, the system control unit 1
13 receives an instruction of “access the third track and start reproduction” from the operation input unit 114, and in step 610, gives an access instruction to the servo unit 106. At this time, the servo unit 106 receives an instruction from the system control unit 113 (processing 61
In response to 2), the CLV control mode is entered, and the spindle motor 102 is started. However, the system control unit 113 locks the CLV control after the spindle motor 102 reaches the reproducible rotation speed, that is, in the process 613. After confirming that, in the process 614, the reproduction amplifier 107 and
The reproduction is instructed to the signal demodulation unit 108, and the capture of the data into the shock proof memory 109 is restarted. At timing 401, the system control unit 113 executes the processing 602
From the operation input unit 114, "Skip to the 5th track"
In step 610, an access instruction is given to the servo unit 106. At this time, the servo unit 106 is in the CLV control mode in advance, and the spindle motor 102 has already reached the reproducible rotation speed. Therefore, the lock of the CLV control in the process 613 is immediately confirmed, and in the process 614, Immediately, the reproduction amplifier 107 and the signal demodulation unit 108 are instructed to reproduce, and the shock proof memory 1
09 is taken in. Therefore, the access at the timing 401 is completed in a shorter time than the access at the timing 400.

Next, at 402, since the timer means 116 overflows and the operation period flag OPF falls, thereafter, similarly to the period A, during the non-reproduction period, the spindle motor is set to the free-run mode during the non-reproduction period. Playback is performed. As a result, 6
Although power consumption increases during four seconds, track access such as skipping can be performed at high speed, and if there is no user operation for a long time, the spindle motor 102 is set to a free run during a period during which reproduction is not performed. Thus, power consumption can be reduced.

Next, a second embodiment of the present invention will be described.
This will be described with reference to FIGS. Second embodiment of the present invention
In the embodiment of the present invention, when the rotation of the spindle motor 102 is stopped or the number of rotations is reduced, and the user instructs to access another track from the currently playing track, a normal line is displayed. By starting reproduction at a rotation speed lower than the rotation speed of the spindle motor 102 corresponding to the speed, the start-up time of the spindle motor 102 is shortened, so that data can be immediately stored in the shock proof memory 109, and sound is generated. The purpose is to reduce the time until.

The structure of the disk reproducing apparatus according to the second embodiment of the present invention is the same as that of the first embodiment of the present invention shown in FIG. The difference from the first embodiment of the present invention is that the reproduction amplifier 107 and the signal demodulation unit 10
8. The servo unit 106 has a normal linear velocity reproduction mode and a double linear velocity reproduction mode, and the mode is switched by an instruction from the system control unit 113. Therefore, the signal demodulation unit 108 supplies the frame clock (about 7.35 kHz) detected at the time of demodulation to the servo unit 106 in the normal linear speed mode, and the frame demodulation detected at the time of demodulation in the double linear speed mode. The clock (about 14.7 kHz) is supplied to the servo unit 106.

Next, the operation of the second embodiment of the present invention will be described.

FIG. 5 is a flowchart showing an operation at the time of reproduction of the system control unit 113 according to the second embodiment of the present invention. In FIG. 5, steps 601 to 614 are the same as those in the flowchart of FIG. 6 showing the operation of the system control unit according to the first embodiment of the present invention, and a description thereof will be omitted.

The process 615 is performed for the servo unit 106.
PU servo (focus servo, tracking servo,
Traverse servo).

Process 616 is a process for instructing the servo section 106 to start the spindle motor 102 and to apply CLV (constant linear velocity) spindle servo of double linear velocity.

The process 617 is a process of branching to the process 618 when the CLV servo lock signal sent from the servo unit 106 is 1, and branching to the process 617 otherwise.

The process 618 is a process for instructing the reproduction amplifier 107 and the signal demodulation unit 108 to start the reproduction at the double linear velocity.

Therefore, when the remaining amount of data in the shock proof memory 109 becomes equal to or smaller than the lower limit L in the process 604, the system control unit 113 according to the second embodiment of the present invention executes the normal line in the processes 611 to 614. When the access is instructed in the process 610, the reproduction at the double linear speed is performed in the processes 615 to 618.

FIG. 6 is a timing chart showing the operation of the second embodiment of the present invention. In FIG. 6, (1) to (7) are the display items as shown in FIG.
Since it is the same as the timing chart showing the operation of the system control unit according to the embodiment, the description of the items is omitted.

The difference from the timing chart of FIG. 2 showing the operation of the system control unit according to the first embodiment of the present invention is as follows.
(4) The spindle motor speed SPDL has increased to a speed at which the linear speed becomes twice the normal linear speed. With this, (5) the reproduction period DEM is reduced by half, and (6) the servo The point is that the CLV control period of the operation SRV is longer.

When the reproduction is performed by doubling the linear velocity, the reproduction period is halved.
8. The average power consumption of the servo unit 106 and the optical pickup 103 can be reduced. On the other hand, when the spindle motor 102 is started and the reproduction is started after the linear speed becomes twice the normal linear speed, the time required to start loading the data into the shock proof memory 109 is long. For example, in a period 409, the spindle motor 102 is started,
When the reproduction is started after the rotation speed of the spindle motor 102 has reached the normal linear speed, the period T is sufficient.
Then, when the spindle motor 102 is started and the reproduction is started after the rotation speed of the spindle motor 102 reaches twice the normal linear speed, it takes 2T time. This delay is not a problem when the data remaining in the shock proof memory 109 is sufficient. However, when the previously acquired data in the shock proof memory 109 becomes invalid, such as when performing track access, sound reproduction is performed. It leads to a delay in starting. In the present embodiment, during normal intermittent playback, playback is performed with the linear velocity doubled.
In order to perform playback at a linear speed of 1x, playback becomes possible after a time T from the access command, but if the playback is started after the linear speed is doubled, 2
It takes time T, and the start of the sound reproduction of the track 3 is delayed by the time T.

Therefore, during normal intermittent reproduction, the average power consumption is reduced by performing reproduction at twice the linear speed, and at the time of access, reproduction is performed at the normal linear speed, thereby delaying the start of audio reproduction. Can be reduced.

Next, a third embodiment of the present invention will be described.
This will be described with reference to FIGS. Third of the present invention
In the embodiment of the present invention, when the rotation of the spindle motor 102 is stopped or the free-run is performed, the data can be read when the user instructs access to another track from the currently reproduced track. At that point, by starting playback, the start-up time of the spindle motor is shortened, data can be immediately stored in the shock proof memory, and the time until sound generation is reduced. An object of the present invention is to reduce the average power consumption of an optical pickup, a reproduction amplifier, a signal processing unit, and a servo unit by increasing a linear velocity and shortening a reproduction time.

The structure of the disk reproducing apparatus according to the third embodiment of the present invention is the same as that of the first embodiment of the present invention shown in FIG. The difference from the first embodiment of the present invention is that the reproduction amplifier 107 and the signal demodulation unit 10
8 has a function of reproducing a signal and storing data in the shock proof memory 109 in accordance with the linear velocity of the signal input from the optical pickup 103 between the 0.5 × linear velocity and the 2 × linear velocity. And the signal demodulation unit 108
When the P (address implement groove) address or the address recorded in the subcode is read, the system has a function of outputting an address OK flag ADOK to the system control unit 113. The function is to increase the number of revolutions of the spindle motor 101 until it reaches the double linear velocity.

Next, the operation of the third embodiment of the present invention will be described. FIG. 7 is a flowchart showing an operation at the time of reproduction of the system control unit 113 according to the third embodiment of the present invention. In FIG. 7, steps 601 to 611 are the same as the flowchart of FIG. 4 showing the operation of the system control unit according to the first embodiment of the present invention, and a description thereof will be omitted.

The process 620 is performed for the servo unit 106.
The process of starting the spindle servo with the double linear velocity as the target value will be described.

The process 621 is performed when the address OK flag ADOK output from the signal demodulation unit 108 is 1,
22 shows the process of branching to step 22;

Process 622 is a process for instructing the reproduction amplifier 107 and the signal demodulation unit 108 to start the reproduction operation.

Therefore, when the remaining amount of data in the shock proof memory 109 becomes equal to or less than the lower limit L in the process 604, the system control unit 113 according to the third embodiment of the present invention executes the process 622 in the process 622 at about 0.5 times speed. The reproduction is started from the linear velocity of, and the rotation speed of the spindle motor 102 gradually increases until the linear velocity reaches twice, so that the reproduction signal rate increases to twice the normal rate. In the case of a mini disc, the reproduction rate is usually 7.35k in terms of frame rate.
Hz, and 14.7 kHz when the linear velocity is doubled.

FIG. 8 is a timing chart showing the operation of the third embodiment of the present invention. In FIG. 8, (1) to (7) are the display items as shown in FIG.
Since it is the same as the timing chart showing the operation of the system control unit according to the embodiment, the description of the items is omitted.

The difference from the timing chart of FIG. 2 showing the operation of the system control unit according to the first embodiment of the present invention is as follows.
(4) The spindle motor speed SPDL is increasing to a speed at which the linear speed becomes twice the normal linear speed. (5) In the playback period DEM, the playback amplifier 107 and the signal demodulation unit 108 Since the signal can be reproduced from the double speed, the address is OK at the timing when the linear speed increases to 0.5 times.
Since the flag ADOK is set, reproduction is started from timing 1019 at which the rotation speed of the spindle motor 102 rises to a speed equivalent to 0.5 times the linear velocity by the processing 621 of the system control unit 113. 1003
1006 and 1009 are states in which the number of revolutions of the spindle motor 102 is gradually increasing to twice the linear velocity,
Reference numeral 1010 denotes a state in which the number of revolutions of the spindle motor 102 keeps twice the linear velocity.
Reference numerals 8 and 1011 denote states where the spindle motor is in a free-run state.

In item (6), 1016, 1017,
Reference numeral 1018 denotes a state in which the servo unit 106 gradually increases the rotation speed of the spindle motor 102 with the target of the double linear speed, and keeps the linear speed when the double linear speed is reached.

As described above, according to the third embodiment of the present invention, at the time of access, the reproduction is started as soon as possible immediately after the spindle motor is started, so that the time until the data is taken into the shock proof memory 109 is started. As a result, it is possible to shorten the delay of the sound reproduction start after the access, and to shorten the reproduction period by increasing the rotation speed of the spindle motor 102 after the start of the reproduction. Therefore, the average power consumption of the reproduction amplifier 107, the signal demodulation unit 108, the servo unit 106, and the optical pickup 103 can be reduced.

In the present embodiment, a case has been described in which the number of revolutions of the spindle motor 102 is controlled with a target of a double linear velocity. However, the number of revolutions of the spindle motor itself may be controlled with a target. To maximize the average value of the reproduction signal, minimize the reproduction period, and minimize the power consumption throughout the disk, the reproduction amplifier 10
7. If the upper limit of the linear velocity of the signal processing system such as the signal demodulation unit 108 becomes a bottleneck, a predetermined linear velocity is controlled as a target,
When the upper limit of the number of revolutions of the spindle motor 102 becomes a bottleneck, it is preferable to target a predetermined number of revolutions of the spindle motor itself.

In this embodiment, the reproduction amplifier 107 and the signal demodulation unit 108 after the spindle motor 102 is started
As an example of the condition for starting the reproduction of the data and for starting the loading into the shock proof memory 109, the address OK flag output from the signal demodulation unit 108 has been described. Anything that shows effectiveness is acceptable.

As for the control of the spindle motor, whether to target a predetermined linear velocity or the spindle motor speed is determined by maximizing the average value of the reproduction signal rate and minimizing the reproduction period throughout the disk. If the upper limit of the linear speed of a signal processing system such as a reproduction amplifier and a signal demodulator is a bottleneck in order to minimize power consumption, a predetermined linear speed is controlled as a target and the upper limit of the rotational speed of the spindle motor is controlled. Is a bottleneck, it is preferable to target a predetermined number of rotations of the spindle motor itself.

[0097]

According to the first aspect of the present invention, the stop of the driving of the spindle motor is prohibited for a certain period after the user performs the operation, and the user can access again within the certain period. When an operation such as an instruction is performed, data can be immediately stored in the shock proof memory without waiting for the start of the spindle motor, and the time until sound generation can be reduced.

According to the disk reproducing apparatus of the present invention, when the spindle motor is stopped or when the track input is issued from the operation input unit at the number of revolutions at which the linear velocity becomes lower than a predetermined value, the spindle motor is rotated. The servo unit, the signal demodulation unit, and the memory control unit are controlled by the rotation speed of the spindle motor at which the linear velocity becomes lower than that during normal reproduction, and the data on the disk is transferred to the shockproof memory. By configuring to start storing,
If the user instructs to skip from the currently playing track to another track while the rotation of the spindle motor is stopped or the number of rotations is decreasing, the spindle motor corresponding to the normal linear velocity By starting reproduction at a rotation speed lower than the rotation speed, the start-up time of the spindle motor can be shortened, data can be immediately stored in the shock proof memory, and the time until sound generation can be shortened.

According to the disk device of the third aspect, the same effects as those of the first or second aspect can be obtained.

According to the disk device of the fourth aspect, at the time of access, the reproduction is started as soon as possible immediately after the start of the spindle motor, thereby shortening the time until the data is started to be loaded into the shock proof memory. As a result, it is possible to reduce a delay in starting sound reproduction after access.

According to the disk device of the fifth aspect, by starting the reproduction as early as possible immediately after the start of the spindle motor, the time until the data is started to be loaded into the shockproof memory can be shortened. As a result, it is possible to reduce the delay of the sound reproduction start after the access, and since the start of the reproduction, the reproduction period can be shortened by increasing the rotation speed of the spindle motor. ,
The average power consumption of the servo unit and the optical pickup can be reduced.

According to the disk device of the sixth aspect, at the time of access, the reproduction is started as soon as possible immediately after the start of the spindle motor, so that the time required to start loading data into the shock proof memory can be shortened. As a result, it is possible to shorten the delay of the sound reproduction start after access, and to shorten the reproduction period by increasing the rotation speed of the spindle motor after the reproduction start, so that the reproduction amplifier, The average power consumption of the signal demodulation unit, the servo unit, and the optical pickup can be reduced.

According to the disk device of the seventh aspect, the same effects as those of the sixth aspect are obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a disc reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing an operation of the disc reproducing apparatus according to the first embodiment.

FIG. 3 is a block diagram illustrating a configuration of a timer unit according to the first embodiment.

FIG. 4 is a flowchart illustrating an operation of a system control unit of the disc reproducing apparatus according to the first embodiment.

FIG. 5 is a flowchart showing an operation of a system control unit of the disk reproducing device according to the second embodiment.

FIG. 6 is a timing chart showing an operation of the disc reproducing apparatus according to the second embodiment.

FIG. 7 is a flowchart illustrating an operation of a system control unit of the disk reproducing device according to the second embodiment.

FIG. 8 is a timing chart showing the operation of the disc reproducing apparatus according to the second embodiment.

FIG. 9 is a block diagram showing the configuration of a conventional disk reproducing apparatus.

FIG. 10 is a timing chart showing the operation of a conventional disk reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 102 Spindle motor 103 Optical pickup 104 Traverse motor 105 Motor driver 106 Servo unit 108 Signal demodulation unit 109 Shock proof memory 110 Memory control unit 111 Audio expansion unit 112 DA converter 113 System control unit 114 Operation input unit 116 Timer means

Claims (7)

[Claims] 1. A spindle motor for rotating a disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, the spindle motor, a servo unit for controlling the pickup and the traverse motor, A signal demodulator for demodulating a reproduced signal; a shock proof memory for storing data demodulated by the signal demodulator; a memory controller for controlling the shock proof memory; and data for reading data from the shock proof memory A reading unit, an operation input unit for a user to instruct an operation, and based on an input from the operation input unit, controlling the servo unit, the signal demodulation unit, and the memory control unit,
When there is an input from the operation unit, a system control unit that outputs an operation input flag, and an operation input period flag until a predetermined time elapses after receiving the operation input flag sent by the system control unit. Timer means for outputting, the system control unit controls the servo unit, the signal demodulation unit, and the memory control unit to store a predetermined amount of data on the disk in the shock proof memory After that, when the operation input period flag is not set, the driving of the spindle motor is stopped, and when the operation input period flag is set, the driving of the spindle motor is not stopped. When the remaining amount of data becomes equal to or less than a predetermined amount, the spindle motor stops or reaches a rotation speed corresponding to a predetermined linear speed or less. When the spindle motor starts, the data on the disk is started to be stored in the shock proof memory after the spindle motor is started, and when the spindle motor has reached the rotation speed corresponding to the predetermined linear velocity, the disk A disk reproducing apparatus, which starts storing the data of the data in the shock proof memory. 2. A spindle motor for rotating a disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, the spindle motor, a servo unit for controlling the pickup and the traverse motor, A signal demodulator for demodulating a reproduced signal; a shock proof memory for storing data demodulated by the signal demodulator; a memory controller for controlling the shock proof memory; and data for reading data from the shock proof memory A reading unit, an operation input unit for a user to instruct an operation, and based on an input from the operation input unit, controlling the servo unit, the signal demodulation unit, and the memory control unit,
When there is an input from the operation unit, a system control unit that outputs an operation input flag, and an operation input period flag until a predetermined time elapses after receiving the operation input flag sent by the system control unit. Timer means for outputting, the system control unit controls the servo unit, the signal demodulation unit, and the memory control unit to store a predetermined amount of data on a disk in the shock proof memory Thereafter, when the operation input period flag is not set, the driving of the spindle motor is stopped, and when the operation input period flag is set, the driving of the spindle motor is not stopped. When the spindle motor is stopped, or when the rotation speed is less than the predetermined linear speed, After the motor is started, the data on the disk is started to be stored in the shock proof memory. When the spindle motor has reached the rotation speed corresponding to the predetermined linear velocity, the data on the disk is immediately stored in the shock proof memory. A disc reproducing apparatus characterized by starting storage in a disc. 3. A system control unit controls a servo unit, a signal demodulation unit, and a memory control unit to store a predetermined amount of data on a disk in a shock-proof memory, and then controls the servo unit, When the operation of the signal demodulation unit is stopped, and when the remaining amount of data in the shock proof memory becomes equal to or less than a predetermined amount, the operation of the servo unit and the signal demodulation unit is started, and the shock proof of the data on the disk is started. 3. The disk reproducing apparatus according to claim 1, wherein storage in the memory is started. 4. A spindle motor for rotating a disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, the spindle motor, a servo unit for controlling the pickup and the traverse motor, A signal demodulator for demodulating a reproduced signal; a shock proof memory for storing data demodulated by the signal demodulator; a memory controller for controlling the shock proof memory; and data for reading data from the shock proof memory A readout unit, an operation input unit for a user to instruct an operation, and a system control unit that controls the servo unit, the signal demodulation unit, and the memory control unit based on an input from the operation input unit. Wherein the system control unit stops the spindle motor. Or at a rotational speed in a state where the linear velocity becomes lower than a predetermined value, in a case where a command of track access from the operation input unit comes, via the servo unit to start the spindle motor, low linear than normal reproduction The servo unit, the signal demodulation unit, and the memory control unit are controlled by the number of rotations of the spindle motor to reach a speed, and storage of data on the disk in the shock proof memory is started. Disc playback device. 5. A spindle motor for rotating a disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, the spindle motor, a servo unit for controlling the pickup and the traverse motor, A signal demodulator for demodulating a reproduced signal; a shock proof memory for storing data demodulated by the signal demodulator; a memory controller for controlling the shock proof memory; and data for reading data from the shock proof memory A readout unit, an operation input unit for a user to instruct an operation, and a system control unit that controls the servo unit, the signal demodulation unit, and the memory control unit based on an input from the operation input unit. The system control unit includes: Stop,
Or, in a free-run state, when the remaining amount of data in the shock proof memory becomes equal to or less than a predetermined amount, the spindle motor is started via the servo unit to control the signal demodulation unit and the memory control unit. To start storing the data on the disk in the shock-proof memory,
Thereafter, the servo unit, the signal demodulation unit, and the memory control unit are controlled to increase the rotation speed of the spindle motor until a predetermined linear speed or a predetermined spindle motor rotation speed is reached. Disk playback device. 6. A spindle motor for rotating a disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, the spindle motor, a servo unit for controlling the pickup and the traverse motor, A signal demodulator for demodulating a reproduced signal; a shock proof memory for storing data demodulated by the signal demodulator; a memory controller for controlling the shock proof memory; and data for reading data from the shock proof memory A readout unit, an operation input unit for a user to instruct an operation, and a system control unit that controls the servo unit, the signal demodulation unit, and the memory control unit based on an input from the operation input unit. Wherein the system control unit stops the spindle motor. Alternatively, when a track access instruction is issued in a free-run state, a spindle motor is started via the servo unit, and the signal demodulation unit and the memory control unit are controlled to read data on the disk. The storage in the shock proof memory is started, and thereafter, the servo unit, the signal demodulation unit, and the memory control unit are controlled to rotate the spindle motor until a predetermined linear speed or a predetermined spindle motor rotation speed is reached. A disc reproducing apparatus characterized by increasing the number of revolutions of a disc. 7. A spindle motor for rotating a disk, a pickup for reproducing a signal from the disk, a traverse motor for transferring the pickup, the spindle motor, a servo unit for controlling the pickup and the traverse motor, A signal demodulator for demodulating a reproduced signal; a shock proof memory for storing data demodulated by the signal demodulator; a memory controller for controlling the shock proof memory; and data for reading data from the shock proof memory A readout unit, an operation input unit for a user to instruct an operation, and a system control unit that controls the servo unit, the signal demodulation unit, and the memory control unit based on an input from the operation input unit. The system control unit includes: In the stop or free-run state, the spindle motor is started via the servo unit, and after the address OK flag output by the signal demodulation unit becomes OK, the signal demodulation unit and the memory control unit are connected. Control to start storing the data on the disk in the shock proof memory, and then control the servo unit, the signal demodulation unit, and the memory control unit to obtain a predetermined linear velocity or a predetermined A disk reproducing apparatus for increasing the rotation speed of a spindle motor until the rotation speed of the spindle motor is reached.