JPH08203205A - Recording of reproducing apparatus - Google Patents

Abstract

PURPOSE: To obtain a recording or reproducing apparatus by which the effect of reducing power consumption is obtained even when a stand-by period and a write/read period are changed over frequently by stopping power supply to a required part and changing over the servo control of a spindle motor, during a period for which a stand-by mode is set according to the capacity of a buffer memory in a recording/reproducing operation. CONSTITUTION: According to the capacity of a RAM 12 as a buffer memory, a system controller 11 sets a stand-by mode. Then, during a stand-by period, power supply to a magnetic head driver 6, a magnetic head 6a, an optical head 4, a threading mechanism 5 which moves a head to the radial direction of a disk 1, and RF amplifier 7, an encoding/decoding part 10a and the like, is stopped, a spindle motor 2 is changed over to a rough constant speed control operation via an FG 36, and a large power consumption is prevented when a recording/reproducing mode is restored. By this constitution, even when a stand-by period and a write/read period are changed over fine, it is possible to obtain the reduction effect of a power consumption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device or reproducing device capable of recording or reproducing data on, for example, a disc-shaped recording medium.

[0002]

2. Description of the Related Art For example, a magneto-optical disk (MO disk)
In a reproducing device and a recording device that use an optical disc as a recording medium, there is a demand to reduce power consumption as much as possible. This demand is particularly great for small portable devices that supply power from an internal battery.

Here, in a reproducing apparatus using a mini disk or a compact disk as a recording medium, for example, the data read from the recording medium by the optical head is temporarily stored in a buffer memory, the data is read from the buffer memory at a predetermined timing, and the data is read. There is one that is adapted to be converted into a reproduced sound signal and output.

In such a configuration, the bit rate for supplying the data read from the optical head to the buffer memory is set higher than the bit rate for reading the data from the buffer memory. That is, in this case, although the data writing to the buffer memory is executed at a high speed, the data reading from the buffer memory is always executed, but the optical head is always read to some extent in the buffer memory during the reproducing operation. This means that the data has been accumulated. As a result, even if the data reading operation from the recording medium by the optical head is temporarily disabled due to, for example, a track jump caused by disturbance or the like, the reproduced sound is continuously output without interruption.

In such a reproducing apparatus, the operation of the optical head and the signal system from the optical head to the buffer memory is
Even if data is written to the buffer memory at a high rate, the data is intermittently supplied so as not to supply more data than the remaining writable capacity of the buffer memory. And
While the data is not actually supplied to the buffer memory, the optical head is controlled in a so-called pause (temporary stop) state and stands by until the next data read timing.

While the optical head is not reading data from the disk, the optical head, the servo system, the demodulation system up to the buffer memory, etc. may be turned off even if the optical head is not always waiting in the pause state. I do not care. Therefore, considering the reduction of power consumption as described above, when the optical head, the servo system, the demodulation system up to the buffer memory, etc. are in the standby state according to the storage capacity of the buffer memory, the power supply to these parts is reduced. It is preferable to execute power saving processing such as stop of supply and stop of operation clock.

[0007]

By the way, a power saving mode is provided as a system operation, and power saving processing is executed for an optical head, a servo system, a demodulation system up to the buffer memory, etc. according to the storage capacity of the buffer memory. If set to, the following problems will occur.

In order to save power, when performing power saving processing during standby in intermittent operation, it is meaningless unless the power saving period is continued for a certain time. Therefore, it is necessary to set the waiting period to some extent longer. However, this means that it is not possible to perform fine data reading because the amount of storage in the buffer memory is close to the full capacity at almost all times. That is, since the data storage amount may be considerably reduced in each power saving period, the risk of stability of the reproduction operation (continuous audio output operation) increases.

Consider, for example, a case where the buffer memory is 4 Mbits in the mini disk system. To ensure that the buffer memory is as close to full capacity as possible during playback, and to take advantage of the seismic resistance function that prevents so-called sound interruption, for example, read the data from the disk for about 0.5 seconds and store it in the buffer memory. It is preferable to repeat the operation of turning on and off for about 1.5 seconds. However, if the optical head, servo system, etc. are powered off each time the standby period of about 1.5 seconds is reached in such an operation, the power consumption of these parts at startup will be the power saved during the standby period. It exceeds the amount and is wasted.

When power saving processing is performed during the standby period,
The actual power saving is realized only when the optical head, the servo system, etc., repeats the operation period of about 2 seconds and the stop of about 10 seconds, which is longer than the operation cycle. However, in this case, considering that the buffer memory is 4 Mbits, if it is stopped for 10 seconds, most of the data accumulated in the full capacity will be read out, and in reality, the seismic function is almost invalid. Will be. Further, in order to maintain the seismic resistance function in this method, at least 16 Mbits or more of buffer memory is required, which results in a great increase in cost.

[0011]

In view of these problems, the present invention provides a power saving process during the stop period, for example, in an operation cycle of reading data from a disk for about 0.5 seconds and stopping for about 1.5 seconds. By doing so, power saving is actually realized. In other words, it is an object of the present invention to realize power saving while retaining the earthquake resistance function without using a large capacity buffer memory means.

For this reason, the data transfer system has a storage means for temporarily storing the data, and is a storage means at the time of recording or reproducing the data, which corresponds to the data storage amount.
In a recording or reproducing apparatus in which a data writing operation or a data reading operation with respect to a disc-shaped recording medium is performed intermittently, a spindle motor rotation is performed by using information read from the disc-shaped recording medium. The first control for keeping the constant linear velocity can be executed, and the second control for keeping the spindle motor rotation substantially constant can be executed by using information from the rotation detecting means attached to the spindle motor. A spindle servo means is provided. Then, during the data recording or reproducing operation and during the writing / reading period during which the data writing operation or the data reading operation is performed on the disk-shaped recording medium, the spindle servo means is subjected to the first control. On the other hand, during the data recording or reproducing operation, and during the standby period in which the data writing operation or the data reading operation to the disc-shaped recording medium is not executed, the power consumption is reduced for a predetermined part. The control means for controlling the operation for controlling the spindle servo means is provided.

Further, in this configuration, the information from the rotation detecting means is used for setting the timing of activating a predetermined portion where the power consumption reducing operation is performed and shifting from the standby period to the writing / reading period. To do.

Further, at the time of shifting from the writing / reading period to the waiting period, the required servo operation value is stored and then the power consumption reducing operation of the predetermined portion is executed and the power consumption reducing operation is performed. When the predetermined portion is activated and the standby period is shifted to the writing / reading period, control is performed using the stored servo operation value.

[0015]

In the standby period, the power consumption is reduced by performing the power consumption reducing operation in which the predetermined portion is turned off. Here, for spindle rotation that consumes a large amount of power at startup, the spindle startup power is unnecessary by rotating the spindle motor roughly at a predetermined speed during the standby time, and the standby period and the write / read period are finely switched. Even in this case, the effect of reducing the power consumption can be obtained. Further, by setting the start and end timings of the standby period (power off) by the rotation detection means and storing the servo operation value at power off, the servo pull-in at power on can be performed quickly. Moreover, it can be done efficiently.

[0016]

Embodiments of the present invention will be described below with reference to FIGS. This embodiment is a recording / reproducing apparatus using a magneto-optical disk as a recording medium, and FIG. 1 shows a block diagram of a main part of the recording / reproducing apparatus.

Reference numeral 1 denotes, for example, a magneto-optical disk on which audio data is recorded, and the disk 1 is a spindle motor 2
It is loaded so as to be rotationally driven by. Reference numeral 3 is an optical head for irradiating the disk 1 with a laser beam during recording / reproducing, which provides a high level laser output for heating the recording track to the Curie temperature during recording, and a reflected light due to the magnetic Kerr effect during reproducing. Provides a relatively low level laser power for detecting data from the. Therefore, the optical head 3 is equipped with a laser diode as a laser output means, an optical system including a polarization beam splitter, an objective lens 3a, and the like, and a detector for detecting reflected light. The objective lens 3a is held by the biaxial mechanism 4 so as to be displaceable in the disc radial direction and the direction in which the disc moves toward and away from the disc.

Reference numeral 6a denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, and is arranged at a position facing the optical head 3 with the disk 1 in between. The entire optical head 3 and the magnetic head 6
A can be moved in the disk radial direction by the sled mechanism 5.

The information detected from the disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 processes the supplied information,
A reproduction RF signal, a tracking error signal, a focus error signal, etc. are extracted. The output of the RF amplifier 7 is supplied to a predetermined portion through the digital servo circuit 9 and the digital servo circuit 9.

The digital servo circuit 9 receives various tracking servo signals, focus error signals, track jump commands, access commands from the system controller 11 composed of a microcomputer, rotational speed detection information of the spindle motor 2, and other various servo signals. A drive signal is generated and supplied to the servo driver 8 as a PWM signal, for example. The servo driver 8 drives the biaxial mechanism 4 and the sled mechanism 5 with electric power (focus drive voltage V _FD , tracking drive voltage V _TD ) according to the pulse duty of the PWM signal to perform focus and tracking control. The system controller 11 can determine the values of the focus drive voltage V _FD and the tracking drive voltage V _TD .

Further, the servo driver 8 applies electric power corresponding to the PWM signal as the spindle error signal to the motor driver 13. The motor driver 13 is a so-called three-phase switching drive motor. During normal recording / reproduction, the rotation speed detection information of the spindle motor 2 is obtained from the reproduction data. That is, in the digital servo circuit 9, the reproduction clock is extracted from the edge detection of the reproduction RF signal (EFM signal), and this is compared with the reference clock to generate the spindle error signal. The spindle motor 2 is controlled to a constant linear velocity (CLV) based on such a spindle error signal.

In the case of this embodiment, an FG (frequency generator) 36 is attached to the spindle motor 2, and the rotation speed information of the spindle motor 2 can be obtained as an FG pulse. The FG 36 is, for example, the spindle motor 2
It is assumed that 12 pulses are output for each one rotation, that is, 12 points can be detected as the rotation phase position together with the rotation speed of the spindle motor 2. The FG pulse is supplied to the system controller 11. The system controller 11 can obtain a value that is a spindle servo error signal by comparing the FG pulse frequency with a predetermined frequency, which can be supplied to the digital servo circuit 9. As a result, in the case of this embodiment, the spindle motor 2 can be controlled to a constant rotation speed by using the output of the FG 36.

Reference numeral 10 is a signal processor. Signal processing unit 10
Is composed of an encoder / decoder section 10a, a memory control section 10b, and an encoder / decoder section 10c. The reproduced RF signal from the RF amplifier 7 is supplied to the encoder / decoder section 10a and subjected to processing such as EFM demodulation, CIRC processing, and CD-ROM decoding. Then, the memory control unit 10b temporarily buffers R
Written to AM12. The reading of data from the disk 1 by the optical head 3 and the transfer of reproduced data from the optical head 3 to the buffer RAM 12 in the data transmission system are 1.41 Mbit / sec, and are intermittently performed.

The data written in the buffer RAM 12 is read out at the timing when the reproduction data is transferred at 0.3 Mbit / sec, and is supplied to the encoder / decoder section 10c. Then, reproduction signal processing such as decoding processing for audio compression processing is performed to obtain digital audio data in the form of 16-bit quantization and 44.1 KHz sampling. 14
Is a conversion unit, and includes a D / A converter 14a and an A / D converter 1
4b is provided. Encoder / decoder section 10c
The digital audio data output by the audio compression / decoding process is converted into an analog signal by the D / A converter 14 a and output from the line output terminal 15. For example, L,
It is output as an R audio signal. Alternatively, it is supplied to the headphone output terminal 18 via the electronic volume 16 and the headphone amplifier 17.

Address information and subcode data used for control operations during reproduction are extracted by the encoder / decoder section 10a and supplied to the system controller 11 for various control operations. Further, when the headphone to be connected is provided with a remote commander, a signal from the remote commander has a remote control input / output terminal 19 provided in the same portion as the headphone output terminal 18 in a 4-terminal connector form or the like.
Is supplied to the system controller 11. If the remote commander has a display unit, the system controller 11 outputs a display control signal from the remote controller input / output terminal 19.

When a recording operation is performed on the disc 1, an audio signal is supplied from the optical / line input terminal 20 or the microphone input terminal 21. Optical / line input terminal 20
Analog audio signal from MIC input terminal 2
The audio signal that is input from 1 and amplified by the microphone amplifier 22 is transmitted through the AGC circuit 23 and the electronic volume 24 to A
Supplied to the D / D converter 24, 16-bit quantization, 44.1KH
It is considered as digital audio data in the form of z sampling.
Then, it is supplied to the encoder / decoder unit 10c and subjected to audio compression encoding processing. The digital audio signal from the optical / line input terminal 20 is directly supplied to the encoder / decoder unit 10c.

The recording data compressed by the encoder / decoder section 10c is temporarily written in the buffer RAM 12 by the memory control 10b, read out at a predetermined timing and sent to the encoder / decoder section 10a. Then, in the encoder / decoder unit 10a, the CI
After undergoing encoding processing such as RC encoding and EFM modulation, it is supplied to the magnetic head drive circuit 6 via the digital servo circuit 9.

The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6 according to the encoded recording data. That is, the magnetic head 6 applies the magnetic field of N or S to the disk 1. Also,
At this time, the system controller 11 supplies a control signal to the optical head so as to output a laser beam of a recording level. During recording, the digital servo circuit 9 performs position servo with respect to the magnetic head 6a.
The relative distance between the disk 1 and the disk 1 is kept substantially constant. During recording, the spindle servo compares the clock obtained from the groove on the disk 1 with the reference clock to generate a servo error signal, and performs CLV control.

Reference numeral 25 denotes a display unit composed of, for example, a liquid crystal display, and the system controller 11
Based on the control of, the operating status, track number, time information, character information, etc. are displayed. Reference numeral 26 denotes an operation unit provided with keys used for user operation, including a reproduction key,
A recording key, a stop key, an AMS key, a search key and the like are provided so as to be operated by the user.

Reference numeral 27 is a stepper driver, and 28 is a stepper motor, which is a driving portion for raising and lowering the magnetic head 6a. This operation is controlled by the system controller 11. An EEP-ROM 29 holds various servo coefficients in the digital servo system, for example. System controller 11 is EE
The required coefficient is extracted from the P-ROM and supplied to the digital servo circuit 9. The RAM 11a shown in the system controller 11 is a work memory in the system controller 11 and, as will be described later, servo drive voltages (V _FD , V _TD ) for power saving operation.
It is a part that performs a memory operation such as.

Reference numeral 30 denotes a clock section, which constantly counts the year, month, day, hour, minute, and second by small batteries having different operating power sources and the like so that the system controller 11 can always discriminate the current date and time. Reference numeral 31 is a power supply circuit that supplies an operating power supply V _DD to each unit, and uses a battery (dry cell or rechargeable battery) 33 housed as a power supply, and also uses a commercial AC power supply by connecting an AC adapter to the DC-IN terminal 32. be able to. The power supply voltage from the power supply circuit 31 is supplied to the system controller 11 via the microcomputer power supply circuit 35. Further, the DC / DC converter 34 outputs the operating power supply voltage V _DD for each unit.

The power supply voltage V _DD can be individually supplied in the required block units of FIG. 1, and at least the shaded blocks in the figure, the optical head 3, the sled mechanism 5, and the magnetic field. Head 6a, magnetic head drive circuit 6, RF amplifier 7, encoder / decoder unit 10a
With respect to, the power is turned on / off independently of other parts. It should be noted that the shaded blocks in the figure are collectively referred to as the power saving target part.

The operation of writing / reading data to / from the buffer RAM 12 during reproduction will be described. Writing / reading of data to / from the buffer RAM 12 is performed by being addressed by the memory controller 12 under the control of the write pointer and the read pointer. Figure 4 shows buffer R
The operation of writing / reading data to / from the AM 12 is conceptually shown, and it is assumed that addresses 0 to n are provisionally set as areas for data in the buffer RAM 12. In addition, in addition to the audio signal data, TOC data for controlling the recording / reproducing operation is actually stored in the buffer RAM 12, so a storage area other than the audio signal data is also set.

As shown in FIG. 4A, the write pointer W and the read pointer R are sequentially incremented from address 0 to address n, and the address 0 is read again after the address n. It is controlled in a so-called ring form that is reset to. Then, when the reproduction operation is started and the data is read from the disk 1 by the optical head 3 and supplied to the buffer RAM 12, the write pointer W is sequentially incremented as shown in FIG. Data is written to each address accordingly. Further, at almost the same time (or when the data is accumulated to some extent), the read pointer R is also sequentially incremented, and data is read from each address and supplied to the encoder / decoder unit 10c. Go.

Here, the write pointer W is as described above.
The read pointer R is incremented at a timing of 1.41 Mbit / sec, while the read pointer R is incremented at a timing of 0.3 Mbit / sec. Therefore, at a certain point, the address indicated by the write pointer W is read as shown in FIG. It catches up with the address indicated by the pointer R. That is, when the read pointer R is at the address x, the address of the write pointer W becomes x−1, and the buffer RAM 12 is in a state in which the full capacity of data is accumulated. At this time, the increment of the write pointer W is stopped, and the data read operation from the disk 1 by the optical head 3 is also stopped. However, since the read pointer R is continuously incremented, the reproduced voice output is not interrupted.

After that, it is assumed that only the read operation is continued from the buffer RAM 12, and the data storage amount N in the buffer RAM 12 becomes less than or equal to a set predetermined amount at a certain point as shown in FIG. 4D, for example. . Here, the data read operation by the optical head 3 and the increment of the write pointer W are restarted again, and are executed until the address of the write pointer W catches up with the address of the read pointer R again. As described above, the write operation of the read data from the disk 1 to the buffer RAM 12 is performed intermittently.

This operation relationship is shown in FIGS. 3 (a) to 3 (c). As shown in FIGS. 2A and 2B, if the reproducing operation is started at time t ₀ , data reading from the disk 1 and storage in the buffer RAM are started first, and immediately after that, data reading from the buffer RAM 12 is started. And the reproduction output as an audio signal is started. Then, assuming that the data storage amount N of the buffer RAM 12 becomes full at time t ₁ (FIG. 2C), the data reading from the disk 1 and the storage operation to the buffer RAM 12 are stopped at that time, and the data storage thereafter. T ₂ decreases to the level where the quantity is N _1.
Not executed until time point. Then, the data reading operation from the disk 1 and the storage operation in the buffer RAM 12 are executed from the time point t _{2 to the} time t ₃ when the data storage is full again.

Here, the period t ₁ -t ₂ is, for example, about 1.5 seconds,
The period from t _{2 to} t ₃ is, for example, about 0.5 second, and the operation is repeated at such timing as long as the normal operation is performed thereafter. In other words, the power-saving target area, such as the optical head 3, that is shaded in FIG. 1 repeats an operation (writing / reading period) of about 0.5 seconds and an operation suspension (standby period) of about 1.5 seconds. .

By outputting the reproduced sound signal via the buffer RAM 12 in this way, even if the tracking is missed due to a disturbance or the like, the reproduced sound output is not interrupted and the data accumulation remains. By accessing the correct tracking position and restarting the data reading, the operation can be continued without affecting the reproduction output. That is, the seismic resistance function can be significantly improved. In particular, by the relatively detailed operation of repeating the write / read period of about 0.5 seconds and the standby period of about 1.5 seconds,
As shown in FIG. 3C, writing to the buffer RAM 12 is restarted at the time when the storage amount reaches a relatively large level of N ₁ , and a data amount that is as close as possible to the full capacity is always stored. By setting the state, the performance as the seismic function is always maintained at a certain level or more.

The buffer RAM 12 at the time of recording
In this operation, the data from the encoder / decoder unit 10c is continuously written by the write pointer W, while the read pointer R is intermittently incremented at a high rate. In other words, the operation of the write pointer W and the read pointer R is basically the reverse of that during reproduction, and the buffer RAM is used during the standby period of the power saving target part.
It is a period from when the accumulated amount of 12 reaches zero to a certain value.

The operation related to power saving realized by the embodiment having such a configuration will be described below. As an operation for power saving, the system controller 11 uses the buffer RAM 1 during reproduction / recording as described above.
In the period in which the power saving target part is in the standby period according to the accumulated amount of 2, the power saving target part is controlled to be in the off state.

In terms of reproduction, about 1. shown in FIG.
During the standby period of 5 seconds, the operation of the power saving target parts is unnecessary, so the system controller 11 controls the power down of these parts. As a power-down control method, a switch is provided on the power line for the power saving target part, and this is turned off to stop the power supply,
Alternatively, it is possible to stop the supply of the operation clock to each part of the power saving target part. It should be noted that even during recording, the power-saving target part is powered down during the period in which the part is waiting for operation.

System controller 11 for power saving
FIG. 2 shows the operation processing (at the time of reproduction) by the. Step F100
Indicates a period during which data is written in the buffer RAM 12. Buffer RAM1
When the storage amount N of 2 becomes full, the process of the system controller 11 proceeds from step F101 to step F102, and first, the data for re-locking the servo system in the next (about 1.5 seconds later) write / read period is acquired. It is stored in the RAM 11a. As the data to be stored, the focus drive voltage V _FD , the tracking drive voltage V _TD (= sled drive voltage which is a low frequency component of the tracking drive voltage), the rotation phase of the spindle motor 2 (that is, the FG count value of 0 to 11), And the FG frequency for maintaining the CLV linear velocity at that time. The FG frequency for maintaining the CLV linear velocity can be calculated from the address extracted from the reproduction data up to that point. That is, the current position in the radial direction of the disk is detected from the address, and the linear velocity at that position is determined. Then, the FG frequency according to the linear velocity may be calculated.

Next, in step F103, servo stop processing is performed. That is, the power-off process is performed on the power saving target part. As a result, the laser output and detector output are stopped in the optical head 3, and the amplification / amplification of the RF amplifier 7 is performed.
The arithmetic operation is also stopped. Further, the focus servo, tracking servo, sled servo, and normal spindle servo by the digital servo circuit 9 are stopped, and further the processing in the encode / decode unit 10a is stopped. During recording, in addition to this, the operations of the magnetic head drive circuit 6, the magnetic head 6a, and the magnetic head position servo are also stopped.

Here, in step F104, the system controller 11 uses the FG pulse from the FG 36 as a rotation speed detection signal to execute a constant rotation speed servo on the spindle motor 2. That is, the frequency from the FG 36 is compared with the FG frequency for maintaining the CLV linear velocity stored in step F102 as a reference frequency, and a servo error signal is generated to control the spindle motor 2 to rotate at a constant speed. As a result, the rotation speed before and after the waiting period is maintained during the waiting period. Note that, in practice, strict constant-speed rotation control is not necessary during the standby period, so the system controller 11 appropriately sends the spindle kick and spindle brake control signals to the digital servo circuit 9 according to the calculated servo error value. It is sufficient to output the output to a rough speed.

As described above, during the standby period, only the FG servo is executed in the circuit system from the disk 1 to the buffer RAM 12, and the other operations are turned off to save the power consumption. Then, the system controller 11 monitors the storage amount N of the buffer RAM 12 as shown as step F105, and when the storage amount N becomes smaller than N ₁ , the writing / reading period starts again, and therefore, the processing after step F106 is performed. To do. That is, the power supply to the power saving target part is restarted, and each processing of focus relock (F106), tracking relock (F107), and CLV servo on (F108) is performed.
The data reading from the disk 1 and the writing operation to the buffer RAM 12 are restarted.

Focus relocking in step F106 may be performed by searching a minute section in the vicinity of the previous focus drive voltage. The focus drive voltage V _FD at the last point of the previous writing / reading period is stored in step F102. The stored value of the focus drive voltage V _FD is M
In the case of V _FD , as shown in FIG. 5A, the focus drive voltage is forcibly changed in the section of S _C around the lens position by the focus drive voltage MV _FD , and the focus pull-in search is performed. It is a thing. With such a minute section search, focus relocking can be performed quickly. In consideration of the case where the focus servo pull-in cannot be performed in the minute section search due to vibrations or changes in the device posture, as shown in FIG. it is sufficient to perform the focus search in the (P _N to P _F range).

By the way, as the focus re-lock, a method of utilizing the surface deviation of the disk without performing the search can be considered. For this purpose, immediately before the last stop of the laser (that is, step F102), one rotation (12
The focus drive voltage V _FD at each pulse timing) is read, and its center value Vf _ON is stored. And FIG.
As described above, when the focus drive voltage V _FD is the highest value (when the relative distance between the disc 1 and the objective lens 3a is the shortest due to the surface deviation), the FG pulse counter is reset to “0”. After doing this, the focus servo is stopped, and the FG pulse count is continued during the waiting period. And if you want to refocus,
The focus drive voltage V _FD is controlled to be the stored Vf _ON, and the focus S-shaped curve is detected from the timing when the FG pulse counter becomes “0”, and the focus is turned on. That is, since the relative distance changes due to the surface deviation of the disc, the focus can be turned on within a 1/2 cycle (disc half rotation) period. If the focus cannot be turned on, the minute section search, the normal search or the like as described above may be performed.

Tracking relocking in step F107 may be performed as follows. The tracking control is periodically affected by the eccentricity of the disk 1. Therefore, if the rotational phase positions are made to coincide when the servo is off and when the servo is on, the tracking offset value when the servo is off is given when the servo is on. Tracking relocking can be performed well, and access after relocking is unnecessary in some cases. Therefore, as schematically shown in FIG. 7, for example, in step F103, the servo-off process is performed at the timing when the value of the FG pulse counter becomes “0”, and in step F107, the FG pulse is relocked.
The tracking servo ON process is performed at the timing when the value of the pulse counter becomes "0". That is, the servo-off and the servo-on are performed at the same phase position of the spindle motor. Also, before the servo is turned off, the sled drive voltage (low-range component V _TD of the tracking drive voltage)
Therefore, the tracking offset value at the timing when the value of the FG pulse counter becomes “0” is calculated, and the tracking control is performed with the offset value at the time of relocking.

As the CLV servo ON processing in step F108, the system controller 11 may control the digital servo circuit 9 so as to switch from the FG servo until then to the normal CLV servo.

As described above, in the present embodiment, power saving is performed by powering down the power saving target portion in the standby period as shown in FIG. 3, and the spindle motor is roughly rotated at a constant speed by using the FG 36. I'm trying to run. In other words, for spindle rotation that consumes a lot of power during startup, the spindle motor 2
Roughly rotating the spindle at a constant speed eliminates the need for spindle startup power at the end of the standby period. In addition, for focus re-locking and tracking re-locking, the drive voltage immediately before the servo is turned off is used, and the timing is controlled by the FG pulse count. it can. With these things, for example, a waiting period of about 1.5 seconds and
Even if the operation is finely switched such as the write / read period of seconds, the power consumption at the time of startup is not so large, and the effect of reducing the power consumption can be obtained. For example, this has made it possible to extend the battery life by about 15 to 20%. And in this embodiment, a waiting period of about 1.5 seconds and
By the operation of writing / reading period of 0.5 seconds, the buffer R
The AM 12 can always maintain the accumulated amount close to the full capacity, which has an advantage that the shock proof function is not impaired even if the power saving process is executed.

In the above embodiment, the example in which the present invention is adopted in the recording / reproducing apparatus has been described, but a reproducing only apparatus or a recording only apparatus may be used. Further, the present invention can be adopted not only in the magneto-optical disk but also in a reproducing apparatus compatible with an optical disk such as a CD.

[0053]

As described above, according to the present invention, the power consumption is reduced by performing the power consumption reducing operation in which the predetermined portion is powered off in the standby period.
Especially for spindle rotation that consumes a lot of power during startup, the spindle motor is secondly controlled during the standby period to roughly rotate at a predetermined speed, so that the spindle startup power becomes unnecessary and the standby period and the write / read period Even if the switch is finely switched, the effect of reducing the power consumption can be obtained. Further, for this reason, the buffer memory means can always maintain the storage amount in a state close to the full capacity at the time of reproduction, which has an advantage that the shock proof function is not impaired by the power saving process.

Further, the start and end timings of the waiting period (power off) can be set by the rotation detecting means,
By storing the servo operation value at power-off, the servo pull-in at power-on can be performed quickly and the power consumption at start-up can be further saved, thus promoting power saving. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of a power saving operation of the embodiment.

FIG. 3 is an explanatory diagram of write / read operation timing of the buffer RAM according to the embodiment.

FIG. 4 is an explanatory diagram of a write / read operation of the buffer RAM according to the embodiment.

FIG. 5 is an explanatory diagram of a focus relocking operation according to the embodiment.

FIG. 6 is an explanatory diagram of another operation for focus relocking according to the embodiment.

FIG. 7 is an explanatory diagram of an operation for tracking relocking according to the embodiment.

[Explanation of symbols]

 1 disk 2 spindle motor 3 optical head 3a objective lens 5 sled mechanism 6 magnetic head drive circuit 6a magnetic head 7 RF amplifier 8 servo driver 9 digital servo circuit 10 signal processing unit 10a, 10c encoding / decoding unit 10b memory control unit 11 system controller 11a RAM 12 buffer RAM 13 motor driver 14 converter 32 power supply circuit 33 battery 36 FG

Claims (3)

[Claims] 1. A data transfer system, comprising storage means for temporarily storing data, and data for a disk-shaped recording medium according to a data storage amount in the storage means at the time of data recording or reproducing operation. In a recording or reproducing apparatus in which the writing operation or the reading operation of the disk is performed intermittently, the first control for making the spindle motor rotation a constant linear velocity by using the information read from the disk-shaped recording medium. And a spindle servo means capable of executing a second control for making the rotation of the spindle motor substantially constant by using information from the rotation detecting means attached to the spindle motor; During the reproducing operation, the writing / reading period during which the data writing operation or the data reading operation is performed on the disc-shaped recording medium Is a standby state in which the spindle servo means executes the first control, while the data recording or reproducing operation is being performed, and the data writing operation or the data reading operation with respect to the disk-shaped recording medium is not executed. During the period, the control unit is configured to perform operation control for reducing power consumption to a predetermined portion and to allow the spindle servo unit to execute the second control. Recording or playback device. 2. The information from the rotation detecting means is used for setting the timing of activating a predetermined portion where the power consumption reducing operation is performed and shifting from the waiting period to the writing / reading period. The recording or reproducing apparatus according to claim 1, which is characterized in that. 3. When shifting from the writing / reading period to the standby period, a required servo operation value is stored and then a power consumption reducing operation of a predetermined portion is executed and a power consumption reducing operation is performed. 2. The control using the stored servo operation value is performed when activating a predetermined portion that has been stored and shifting from the waiting period to the writing / reading period. The recording or reproducing apparatus according to Item 2.