JPH07121973A - Recorder/reproducer - Google Patents

Abstract

PURPOSE:To reduce power of a motor at the time of operating, and shorten a long waiting time up to starting in a power saving type recorder/reproducer used for a personal computer, etc. CONSTITUTION:A motor number-of-revolution controlling unit 55 is provided in a power controller 9 to increase or decrease number of revolutions of a motor 8 based on cache residual information from a cache memory monitor 64. Thus, a recorder/reproducer in which the motor is decelerated to provide high power deleting effect and short starting time is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus using a recording medium.

[0002]

2. Description of the Related Art In recent years, as recording / reproducing devices used for personal computers and the like, those having a power saving function have begun to appear. The conventional method is to stop the rotation of the motor that is rotating at a constant angular velocity when there is no request for data recording and reproduction for a certain period of time, start the motor when there is a request, and rotate it at the set number of revolutions again. Has been. Therefore, when there is a request for recording / reproducing data, it takes 3 inches for a disc with a small diameter of 2 inches from the stop mode to the operation mode.
Since it takes about 5 seconds for a 3.5 inch medium-diameter disk, there is a problem in that a waiting time is required for reading and writing data. In addition, 6000 r. p. There is a problem that recording / reproducing can be performed only at a certain fixed number of revolutions such as m, and power consumption of the motor cannot be reduced during operation.

[0003]

However, in the conventional configuration, since the recording medium is rotated at one constant rotation speed for recording and reproducing, only two modes, that is, a stopped state of the rotation of the motor and a rotated state of being activated are provided. I could not choose. Therefore, not only the power saving range is small, but also recording and reproduction cannot be performed at all until a predetermined number of rotations is reached, and thus there is a problem that a waiting time of several seconds is required from stop to recording and reproduction.

The present invention solves the above-mentioned conventional problems, and has the advantages of both the reduction of motor power in the operating state during recording / reproduction and the reduced waiting time for data reading / writing during power saving operation. An object is to provide a reproducing device.

[0005]

In order to achieve this object, a recording / reproducing apparatus of the present invention has a recording medium, a rotary motor for rotating the recording medium, a recording / reproducing head, a recording / reproducing circuit, and an external input / output unit. When the recording medium is rotated by the rotating motor to record and reproduce a recording signal on the recording medium by the recording / reproducing head, and the state in which the amount of recording / reproducing data to be recorded / reproduced is small for a certain period of time, the rotating motor is rotated. The recording / reproducing apparatus for stopping or starting the power supply has a configuration including a power control unit, a motor rotation speed changing unit, and a recording / reproducing clock reproducing unit.

[0006]

With this configuration, in the power saving mode, the motor rotation speed changing unit lowers the rotation speed of the motor, and the PLL center frequency of the recording / reproducing clock reproduction unit is increased / decreased in conjunction with the rotation speed. It is possible to record and reproduce stably. In this way, it is possible to reduce power consumption during operation as well as to substantially reduce the waiting time before activation, thereby speeding up data access time.

[0007]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a recording / reproducing apparatus of the first embodiment. Although the present invention is effective for both the optical recording device and the magnetic recording / reproducing device, using the configuration diagram of the magnetic recording device,
The principle will be explained.

The recording / reproducing apparatus 1 has therein a recording medium 3 such as a magnetic disk having a recording layer 2 in which information is recorded as a magnetic recording signal 4. This recording medium 3 is a motor drive circuit 7
It is rotated by a rotary motor 8 driven by. The magnetic recording signal 4 is recorded or reproduced by the magnetic head 5. The recording / reproducing unit 6 demodulates the reproduction signal of the magnetic head 5 into a digital output signal, modulates the digital input signal into a magnetic recording signal, and sends it to the magnetic head 5.

The configuration described above includes the same parts as the conventional system. The feature of the present invention is that in the case of a conventional type hard disk, recording / reproducing is performed in a CAV in which a recording medium is rotated at a specific constant rotation speed or a constant linear velocity, or in a zone CAV or zone CLV. The electric power control unit 9 reduces the rotation speed of the rotary motor 8,
The power consumption is greatly reduced by recording / reproducing, lowering or stopping the operation clock frequency of each digital circuit unit in conjunction with deceleration.

In the system in which the slider is simply pushed with a constant spring pressure W _SC as shown in the relationship between the flying height of the slider and the rotation speed of FIG. 6, when the rotation motor 8 is decelerated as shown by the spring characteristic 51b, the landing rotation speed N is reached. _{At L} , the levitation force and spring pressure W _SC become substantially equal, and the levitation distance 11 between the slider 10 and the recording medium 3 becomes extremely narrow. Since the recording medium 3 has irregularities, the magnetic head 5 and the recording medium 3 come into contact with each other, the recording layer 2 is destroyed, and it becomes impossible to record / reproduce data.

On the other hand, in the first embodiment, as a first method, as shown in FIG. 1, the slider flying height control unit 15 is provided together with the recording / reproducing track changing unit 14 in the central control unit 13, and the motor rotation speed is set. The slider flying height is controlled so as to ensure a constant flying height of the slider, even if the value of H is lowered.

According to the spring characteristic 51a of FIG.
The first method is the motor speed N or the head and
The slider flying height control unit as the relative velocity V of the tire decreases.
Slider pressure changer 16 controlled by
Spring pressure W of rider spring 17 _SCCan be lowered. By this
Therefore, the head flying height h₀Decrease of
Is alleviated. Therefore, even if the rotation speed N becomes 1 / n,
The rider 10 levitates, and the recording head 5 moves even at low speed rotation.
It is possible to record and reproduce without contact between the recording layer 1 and the recording layer 1.
It

This state is shown in FIGS. 9 (a) and 9 (b).
(C) (d) (e), R = 1, 1/2, 1/4,
The change in the spring force of the slider spring force and the floating force in the case of 1/8, 0 is shown.

In this case, for example, if the spring pressure W _S shown in the case of R = 1/8 in FIG. 6 is weakened to secure the flying height h ₀ , the spring force due to the flying force and the slider spring force are weak,
It becomes vulnerable to external shocks.

Therefore, in a personal computer such as a notebook computer that can also be used for portable use, when the rotational speed is reduced to 1 / n times to save power, the levitation spring force and slider spring force are weak and the external force is reduced. The impact of the contact of the slider 10 with the recording layer 2 may destroy the data. In the present invention, an external impact force is detected by the G sensor 18, and when a G having a magnitude equal to or higher than the second level is detected, the magnetic head 5 is retracted to the retracting track 12a shown in FIG. Stop the rotation and protect the recording layer.

If G of a magnitude equal to or higher than the first level is detected below the second level, for example, at t = t _8x to t = t _a in FIG. If it is increased from 1/2 to 1/2, the levitation force and the force of the slider spring become stronger, and a moderate external shock can be withstood between t = t _a and t ₁₀ . When the detection signal of the G sensor 18 becomes small and continues for a certain period of time, it is determined that the external impact is reduced, and t = t ₁₁
In, the mode returns to the power saving mode of R = 1/8 again.

The first method for reducing the strength of the slider spring 17 by the slider pressure changer 16 according to the number of revolutions and maintaining the head flying is large because it can deal with wide deceleration of the number of revolutions of the motor. There is a power reduction effect.
Further, by providing the G sensor 18, the support spring force of the slider 10 is strengthened or weakened by changing the rotation speed N according to external vibration, thereby preventing the recording layer 2 from being damaged by the contact of the slider 10. .

Next, the second method will be described. When it is not necessary to set a wide deceleration width of the motor rotation, FIG. 14 (a)
As shown in the slider cross-sectional view and perspective view of (b), a concave negative pressure generating portion 81 is provided on the sliding surface of the slider 10. As a result, as the linear velocity V increases as shown in FIG. 15, even if the linear velocity V is increased as shown by the solid curve 30a, the linear velocity V is increased as compared with the curve 30b shown by the dotted line of a normal positive pressure slider. The flying height of the slider is suppressed by the negative pressure F _N shown in a). Therefore, as indicated by a curve 30a in the relationship diagram between the linear velocity and the slider flying height in FIG. 15, the flying height of the slider is maintained in a substantially constant range with respect to the rotation speed N. Figure 15
In the case of, the reference flying height is set to 0.2 μm, and it is within the range of ± 0.5 μm even when decelerating from 1 × speed to 1/4 × speed, indicating that recording / reproduction is possible. .
Although the deceleration range is slightly narrowed, the use of the negative pressure slider enables deceleration even if the slider is pressed with a constant slider pressure without the slider pressure adjusting portion.

By combining the negative pressure slider system and the power saving system in this way, the slider 10 does not come into contact with the recording medium even if the rotation speed of the motor is reduced, and the power of the motor can be reduced. it can.

As a third method, a negative pressure slider 10 having a negative pressure generating portion as shown in FIG.
A more stable flying height h ₀ of the slider 10 can be obtained by combining the slider pressing changer 16 shown in FIG. With this method, even if the value of n of R = 1 / n, that is, the reduction ratio is large, the fluctuation of the slider flying height is small. For this reason, recording / reproduction can be performed without the slider 10 coming into contact with the recording medium 3 even when rotating at a low speed of 1/8 times speed or 1/10 times speed. Therefore, since the recording / reproducing can be performed at a low rotation speed, the power consumption can be further reduced.

Here, a method of changing the pressing force of the slider will be described. As shown in the perspective view of the system of FIG. 11, the four sliders 10a, 10b, 10c, and 10d are attached to the head arms 20a, 20b, 20c, and 20d, and tracking control is performed by the track drive unit 19. The track drive unit 19 includes a tracking motor 19
a As shown in FIG. 12, the slider pressing changer 16 is provided, and when the arm elevating shaft 23 is rotated clockwise in the direction of arrow 24, the arm elevating parts 21a and 21c move upward, and the arrows 24a and 24c. The slider arm 20a, 20c is pushed by the force in the direction, and the slider pushing force is reduced. On the other hand, the arm elevating parts 21b and 21d move downward, and the slider arms 20b and 20d are respectively provided with arrows 24b,
The force in the 24d direction is applied, and the slider arms 20b, 20
The slider pressing force of d is similarly reduced. On the other hand, when the slider pressing changer 16 is turned in the opposite direction, the slider pressing force increases. In this way, the slider pressure can be controlled to an arbitrary value.

Recording and reproduction will be described next. Recording signal M
In the case of the R head, the detected signal is as shown in FIG. On the other hand, in the case of a ring head, it becomes as shown in FIG. The detected signal is reproduced by the reproducing circuit 25 of the recording / reproducing unit 9.
2 and the reproduced clock signal as shown in FIG. 2E is reproduced by the PLL 27 in the clock reproduction unit 26. Based on the reproduced clock signal, the punching section 38 of the demodulator 28 punches out a digital signal as shown in FIG.

In the case of the first embodiment, the rotational speed during recording / reproduction has a very wide range of 1, 1/2, 1/4 and 1/8. For this reason, the recording / reproducing clock also fluctuates greatly as shown in FIG. In the first embodiment, since the pull-in range of the PLL 27 of the recording / reproducing clock reproducing unit 26 of the reproducing circuit 25 is widened, the reproduced clock is rapidly reproduced. The sync pulse recorded in the address area is reproduced, or the rotation pulse corresponding to the rotation speed of the recording medium is obtained from the motor rotation pulse from the rotation pulse generator 8a of the motor 8 and shown in FIG. The pull-in center frequency 34 of the reference clock signal generator 2a is set to an appropriate value according to the rotation speed of the recording medium. For example, as shown in FIG. 3B, when the rotation is ⅛, the pull-in center frequency is f _n = f ₈
controlled to be b f _1/8. Specifically, the pull-in center frequency control unit 29 controls the VCO 30 according to the recording medium rotation pulse corresponding to the recording medium rotation speed. Frequency divider 3
After passing through 1, f _n = f ₈ . R = 1/8, 1/4, 1 /
PLL pull-in center frequency 34d in the case of 2 and 3
As shown in FIG. 3B, 4c, 34b, and 34a are set to optimum values according to the rotation speed of the recording medium 3. Even if the number of revolutions changes continuously, as shown in Fig. 5, PL
Since the L pull-in center frequency f _n is continuously set to the optimum value according to the recording medium rotation speed, there is an effect that the read / write clock is pulled in and generated from the read signal in a short time.

During recording, the recording / reproducing clock reproducing unit 26 similarly obtains a recording / reproducing clock corresponding to the number of revolutions. Therefore, even if the number of revolutions is continuously changed, the recording medium 3 has the set recording wavelength. The recording signal is recorded in. In this way, basically, recording is performed even while the number of revolutions is continuously changed. Since the entire time the motor is rotating can be used for recording, the time utilization efficiency is high and the power saving effect is high.

Next, a method for further reducing the error rate during recording will be described. Recording requires more accuracy than playback, so recording while the rotation speed is continuously changing is highly power-saving, but for applications that require reliable recording. Is not preferable. Therefore, in such an application, as shown in FIG. 10 (c), reproduction is performed even while the rotation speed is changing, but recording is performed by R = 1/8, 1/4, 1/2,
There is also a second method, which is performed in a constant angular velocity state such as 1. With this method, the power saving effect is slightly reduced, but there is an effect that recording with a lower error rate can be performed.
It is necessary to quickly access the data at the time of reproduction, but at the time of recording, even if the data is recorded later, there is no problem as long as the recording is surely performed. In the first embodiment, the recording cache memory 6
By storing a certain amount of recording data in 3a, the power control unit 9 reduces the number of times that magnetic recording is performed mechanically. The data to be recorded is actually written in the cache memory by the cache memory monitor unit 64 until the recording cache memory 63a reaches the specified amount and before the recording data reaches, but when viewed from the computer unit 100, it is stored in the recording medium 3. It can be treated as recorded. During this period, there is no mechanical power consumption, and the electronic circuit consumes less power, so the overall power consumption is reduced. In this way, mechanical operations for recording several times are omitted.
When the recording cache memory 63a reaches the set value, the data to be recorded stored in the recording cache memory 63a is sent to the recording / reproducing unit 63a and actually recorded on the recording medium 3.

Since the recording cache memory 63a is used as a buffer memory at the time of recording, a constant amount of remaining memory is always secured. This remaining memory is shown in FIG.
As shown in t = t ₁₅ of (c), when recording at R = 1/8, when the data rate of the recording data is higher than the recording transfer data rate of R = 1/8, the data is accumulated in the remaining memory area. By doing so, it is possible to record at a low rotation speed of R = 1/8, and it is not necessary to increase the rotation speed, so power can be saved.
When the data rate of the recording data is too high and the buffer remaining amount is small, the number of rotations is increased to R = 1/4 or R = 1/2 to increase the memory remaining amount. In this way, the power control unit 9 performs fine power saving work to reduce power.
The recording cache memory 63a and the cache memory monitor unit 64 have the effect of reducing the electric power of the motor by lowering the rotation speed during recording and reducing the actual recording frequency. Even if the power of the recording / cache memory 63a is stopped by the memory backup unit 69, the data is surely recorded because the data saved when the power is turned on again is recorded in the recording medium 3 because the data is backed up.

The reproduction cache memory 63b stores data having a high reproduction frequency such as the data of the previously read track. Therefore, when reproducing these data again, it is sufficient to reproduce the data in the cache memory.
Since mechanical reading can be omitted, there is an effect that power can be reduced.

Next, returning to the reproducing method, the reproducing circuit will be described in more detail with reference to FIG. Reproduction circuit 25
Is composed of a recording / reproducing clock unit 26.

The reproduced signal from the head is first sent to the head amplifier.
Cutoff frequency f_cLPF with
The high frequency component is cut by 35. When playing, this
LPF plays an important role. Conventional normal hard disk
In the case of a drive, as shown in Fig. 4 (e), the rotation speed is constant
F is recorded and played back at_cIs fixed. But the book
In the case of the invention, the number of revolutions is greatly changed to save power.
So, for example, if the rotation speed is 1/8, 1/4, or 1/2,
In this case, as shown in FIGS. 4B, 4C, and 4D, f _cF_c
/ 8, f_c/ 4, f_c/ 2 and frequency f_cBy the changer 36
The filter characteristics of the head amplifier are continuously changed. L
By continuously changing the PF35 according to the rotation speed
Filter characteristics are optimized at all speeds.
Therefore, stable signal reproduction is possible even when the rotation speed is changed.
It has the effect of becoming Noh. Head amplifier amplification MR
In the case of a head, the reproduced signal is differentiated by the differentiator 37 and is output.
The punching section 38 punches with a recording / reproducing clock.
Then, the digital signal is demodulated. The signal waveform in this case is
2 (d) and 2 (f).

Next, the reproducing head will be described. As shown in the relationship diagram between the output of the magnetic head and the linear velocity in FIG. 18, the output curve 39 of the ring type magnetic head is
A higher output than the head can be obtained. However, the output gradually decreases as the rotation speed of the recording medium 3 decreases. As shown in FIG. 18, when the rotation speed becomes ⅛, the output voltage also becomes ⅛, and the output voltage drops near 20 dB. If it drops by this amount, the error rate becomes high, and it becomes difficult to reproduce a normal digital signal in computer applications. On the other hand, the magnetic head 5 of the shield type MR head has a lower output than that of the ring type head when the rotational speed is high, as shown by the output curve 40a of the MR type head. However, since the reproduction output does not decrease in principle even when the rotation speed becomes low, the output of the MR head becomes higher than that of the ring head.

In the first embodiment, reproduction is performed with the rotation speed greatly reduced to save power, but since the MR head is used, a high reproduction output can be obtained even if the rotation speed is reduced.
Even in the low speed rotation power saving mode, there is an effect that data reproduction with a low error rate can be performed.

In the first embodiment, as shown in FIG. 18, since the shield type MR head having a higher output than the yoke type MR head is used, more stable reproduction is possible. As shown in the perspective view of the shield type MR head of FIG. 17, in the first embodiment, the MR whose magnetic resistance (MR) changes with the magnetic field.
Since the element 41 is provided perpendicularly to the traveling direction of the medium 5 and the shield type MR head in which the shields 44a and 44b are provided on both sides to eliminate the influence of external noise is used, the reproduction output is high. A magnetic recording signal can be reproduced by measuring the change in the magnetic resistance by applying a current to the MR element 41 by the bias voltage section 42 and measuring the magnetic resistance by the magnetic resistance measuring section 43.

FIGS. 7A and 7B show an MR reproducing head 5a.
2 shows a state where the ring type magnetic head 5b is incorporated in one slider 10. When rotating at high speed, Fig. 7 (a)
As shown in, the flying height h ₀ (1) is large. During low-speed rotation, the flying height h ₀ (1 / n) becomes small even if the flying height is controlled as shown in FIG. 7B. Therefore, since the output of the MR head 5a does not decrease at low speed rotation, the reproduction output is R =
It is a little larger than the case of 1. By thus combining and using the MR head 5a and the ring head, there is an effect that a sufficient reproduction output can be obtained even if the rotation speed is reduced.

At the time of recording, the ring magnetic head 5b is used. If the rotation speed is reduced to 1 / n as described above,
Since the flying height h ₀ (1 / n) is reduced and the space loss is reduced, the recording efficiency is improved. Therefore, the recording circuit 4 of FIG.
Since the magnetic recording can be performed even if the recording current of the recording circuit 47 of No. 5 is reduced, the electric power at the time of recording can be reduced. Particularly in the case of the present invention, as shown in the case of R = 1/4 in FIG. 2E, the recording / reproducing clock frequency becomes low and the power consumption of the digital circuit unit is reduced. It goes down greatly.

The recording / reproducing section 6 has a digital processing section 52 for processing a reproduced digital signal reproduced and a recording digital signal for recording, and performs error checking, error correction of data, correction of time axis, etc. Is going. The digital processing section 52 includes a recording / playback processing section 53 and an interface section 54. Of these, the data rate of the information amount to be processed by the recording / reproducing digital processing unit 53 decreases as the motor rotation speed R = 1, 1/2, 1/4, 1/8 as shown in FIG. 2 (f). Therefore, the power control unit 9 sends a deceleration command to the motor rotation speed changing unit 55 at the time of power saving to reduce the motor rotation speed to set R = 1, 1/2, 1/4, 1/8, and the digital processing unit 53. Among them, the clock of the block that does not need to be operated is stopped, or the clock of the block that needs to be operated, for example, the clock of the recording / reproducing digital processor 53 is
By setting it to 2, 1/4, 1/8, the power consumption of the block of this digital circuit can be surely reduced according to the slowing of the clock. In the analog circuit section of the recording / reproducing section, the power is turned off to save power as shown in FIG. 10C except when recording or reproducing. Since the other interface section 54 exchanges data with other circuit blocks, the internal clock can be lowered, but the external clock cannot be lowered alone. The external clock of this portion is the reference clock generator 5 of the power supply controller 56.
It is necessary to operate in synchronization with the reference clock of the 7 system.

As for the reference clock of the system, the power control unit 9 which has received the start / stop control signal slows down the clock.
Then, this activation suspension control signal is issued by the power control unit 102 in the CPU 101 of the computer unit 100 shown in FIG. 13 or 20 which is connected to the recording / reproducing apparatus 1 by the connection line 106, and in the interface unit 103. From the drive start / pause control signal generator 104, the input / output unit 60 of the interface circuit 59 of the recording / reproducing apparatus 1
Then, it is detected by the start / stop control signal detection unit 61 and sent to the power control unit 9.

Power control section 102 of computer section 100
Drive recording / reproducing data monitor unit 10 provided in
Reference numeral 7 constantly monitors the recording / reproducing data amount and frequency of the recording / reproducing apparatus 1 and the computer unit 100, and when the power control unit 102 determines that the data amount and frequency are low, the drive is stopped or suspended for power saving. , Control signals for standby, speed reduction, and speed increase are sent to the drive activation pause control signal generation unit 104 in the interface unit 103.

Returning to the magnetic recording / reproducing apparatus 1, when the above-mentioned start / stop control signal is received, or when a request for recording data or reproduction data is made from the computer 100, the start / stop signal detecting section 61 informs the power control section 9 of that. The information is transmitted, and the power control unit 9 responds to the start / stop instruction by the cache memory 63.
The remaining cache amounts of a and 63b are monitored. While checking the remaining memory capacity of the cache memory monitor unit 64,
In addition to increasing / decreasing the clock of the reference clock generating unit 57 or the low-speed clock generating unit 58, controlling the motor rotation speed changing unit 55 to increase / decrease the rotation speed of the motor 8 or start / stop each block. Start / pause the circuit, speed up the internal clock of CPU13 /
The power consumption of each part is reduced by performing a slow power-saving control by slowing down or starting / stopping.

The power saving operation of the present invention is shown in FIG.
The conventional type power-saving operation unit of (b) and FIGS.
A description will be given by using the power saving operation diagram of the present invention.

First, in the conventional case shown in FIGS. 10A and 10B, a sleep mode is installed. In sleep mode, the rotation of the motor is stopped and the power consumption of the motor is reduced. However, at the time of start-up, data cannot be recorded / reproduced at all until the rated rotation is reached, so a waiting time of 3 to 10 seconds occurs until the reproduction data is obtained.

On the other hand, in the method of the present invention shown in FIGS. 3C and 3D, the cache memory / data rate monitor unit of FIG. 1 constantly checks the data recording / reproducing amount and reports it to the power control unit 9. There is. Thus, 1/8 at time t = t ₂ after starting at t = t ₁ as shown in FIG. 10 (c)
Playback can be started at double speed and playback data can be accessed. At t = t ₂ , the analog circuit of the recording / playback section is turned on.
Since the digital circuit operates at a low speed clock of 1/4 and the main clock at 1/2, the power of the digital circuit is reduced. At this time, the power control unit 9 reduces the driving force of the track drive unit 19 during the track sheave to save power.
Although the track access speed becomes slower, in the first embodiment, since the reproduction can be performed even at a low rotation speed, there is a power saving effect without substantially increasing the access time. At t = t ₄ , reproduction is ended and recording is started. Recording is terminated at t = t ₅ , the analog circuit of the recording / reproducing unit is turned off, and the clock of the digital circuit is stopped. t = t ₅ ~t ₆ waits in idle state, power Ministry rested the operation of the circuit except for the interface unit. At t = t ₆ , the motor is decelerated to 1/8 and the power is further reduced. Playback is started at t = t ₈ , and if the G sensor 18 detects a shock as shown in the flowchart of FIG. 16 or if the amount of playback data is insufficient, acceleration is performed at t = t ₉ and t = t ₁₁ Full rotation with. When the data reproduction is completed, the motor is decelerated at t = t ₁₂ , the analog circuit is turned off, the clock of the digital circuit is stopped, and R =
Reduce to 1/8. At t = t ₁₄ , the analog circuit is turned on to start reproduction, and at t = t ₁₅ , recording is started. Recording is performed until t = t ₁₆ and the idle mode is entered. When there is no data access, the sleep mode is entered at t = t ₁₇ , the head is retracted to the retracted track, and the motor is completely stopped. When there is no request for a certain period of time, at t = t ₁₉ , the power is turned off except for the interface section.

The motor rotation speed and operation clock control routine shown in FIG. 16 will be described. Step 70
In a, the routine is started, and in step 70b, the recording / reproducing mode, the remaining amount value of the cache memory 63a, the data rate, and the power saving instruction of the personal computer are checked, and the power saving operation table is checked. ON / OFF of the circuit and the value of the rotation speed R = 1 / n are determined. The rotation speed R is set to 1 / n in step 70c, the motor is rotated in 1 / n in step 70d, the average detection signal amount S _G of the G sensor is calculated in step 70e, and this rotation is performed with S _{G in} step 70f. Number R = 1 / n G
Compared with the reference detection signal amount S _G (1 / n) of the sensor, if S _G is significantly larger than S _G (1 / n) in step 70g, the motor is retracted to the retreat track in step 70j while the motor is retracted. To stop. In step 70k S _G becomes S _G
It is checked whether or not it becomes (1 / n). If NO, continue stopping the motor, and if YES, rotate the motor at R = 1 / n.
Returning to step 70g, if NO, the process proceeds to step 70h, where S _G <S _G (1 / n), that is, the G proof strength at G and its rotational speed is checked, and if NO, 1 / n at step 70i.
To increase the rotation speed and increase the resistance to G.
Then, it is checked again in step 70h. If YES in step 70h, the average file transfer amount D _T required in step 70n is calculated, and step 70p is calculated.
Then, this D _T is compared with the reference transfer amount D _T (1 / n) from the recording medium at the rotation and speed of R = 1 / n while considering the remaining amount of the recording cache, and in step 70q, D _T > D _T ( 1
/ N) is YES, 1 / n is increased in step 70s, the number of rotations is increased to increase the recording / reproducing data rate, and the process returns to step 70q. If NO, the recording / reproducing data rate is sufficient, so the routine proceeds to step 70r, where D _T <D _T (1
/ N), that is, it is checked whether the recording / reproducing data rate is too high. If NO, the amount is not too large, and it is understood that the amount is appropriate, so the process returns to step 70b.

As is apparent from the comparison between FIG. 10 (b) and FIG. 10 (d), it is possible to obtain the effect that the power can be greatly reduced and the access speed can be improved. By using the present invention in a magneto-optical disk drive as shown in FIG. 21, it is possible to reduce the rotational speed and similarly obtain a power saving effect. Particularly in the case of the magnetic field modulation method, the flying slider is levitated by the method of the present invention even at a low speed, and at the same time, the optical output is lowered to perform the recording / reproducing, whereby a great power reduction effect can be obtained. The present invention is applied to the other magneto-optical disk drive, phase change type, CDROM, and dye type optical disk drive shown in FIG. 22 to reduce the rotation speed and reduce the optical output to perform low-speed rotation. With low light output, power saving recording and reproduction can be performed.

[0045]

As described above, recording / reproducing is performed at an arbitrary rotational speed by using the recording / reproducing motor rotational speed changing unit and the slider whose flying height is small even if the rotational speed fluctuates in the electric power control unit. be able to. In this way, it is possible to reduce the power consumption of the motor even during operation,
The data access time from starting the motor to recording / reproducing data can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus and a computer unit according to a first embodiment.

2A is a waveform diagram of a motor rotation pulse in the first embodiment, FIG. 2B is a waveform diagram of a reference clock in the first embodiment, and FIG. 2C is a waveform diagram of a reproduction signal of the MR head in the first embodiment. Is a waveform diagram of the reproduced signal after differentiation in the first embodiment. (E) is a waveform diagram of the recording / reproducing clock in the first embodiment. (F) is a waveform diagram of the demodulated signal in the first embodiment.

3A is a block diagram of a recording / reproducing clock reproducing unit according to the first embodiment, and FIG. 3B is a drawing center frequency arrangement diagram according to the first embodiment.

4A is a block diagram of a reproducing circuit according to the first embodiment, FIG. 4B is a filter characteristic diagram when R = 1/8 in the first embodiment, and FIG. 4C is a filter characteristic when R = 1/4 in the first embodiment. Filter characteristic chart (d) is a filter characteristic chart when R = 1/2 in the first embodiment. (E) is a filter characteristic chart when R = 1 in the first embodiment.

FIG. 5 is a diagram showing the relationship between the PLL pull-in center frequency and the recording medium rotation speed in the first embodiment.

FIG. 6 is a diagram showing the relationship between the flying force of the slider and the motor rotation speed in the first embodiment.

FIG. 7A is a cross-sectional view of the slider portion in the first embodiment. FIG. 7B is a cross-sectional view of the slider portion in the first embodiment.

8A is a diagram showing a motor rotation speed, a slider flying height, and a slider pressing force in the first embodiment. FIG. 8B is a diagram showing a motor rotation speed, a slider flying height, and a slider pressing force in the first embodiment. () Shows the motor rotation speed, slider flying height, and slider pressing force in the first embodiment. (D) shows motor rotation speed, slider flying height, and slider pressing force in the first embodiment. (E) shows that in the first embodiment. Diagram showing motor speed, slider flying height, and slider pressing force

FIG. 9 is a top view of a recording medium track and a slider arm according to the first embodiment.

10A is a time change diagram of the motor rotation speed of the conventional system, FIG. 10B is a time change diagram of the power consumption of the conventional system, and FIG. 10C is a time change diagram of the motor rotation number in the first embodiment. Is a time change diagram of power consumption in Example 1.

FIG. 11 is a perspective view of the recording / reproducing apparatus according to the first embodiment.

FIG. 12 is a cross-sectional view of the track drive unit according to the first embodiment.

FIG. 13 is a perspective view of the personal computer according to the first embodiment.

14A is a cross-sectional view of the slider of the first embodiment, FIG. 14B is a perspective view of the slider of the first embodiment, and FIG. 14C is a perspective view of the slider of the first embodiment.

FIG. 15 is a diagram showing the relationship between the slider flying height ho and the linear velocity μ of the first embodiment.

FIG. 16 is a flowchart of a power saving routine according to the first embodiment.

FIG. 17 is a perspective view of the MR head according to the first embodiment.

FIG. 18 is a diagram showing the relationship between the linear velocity and the output voltage of the MR head of Example 1.

FIG. 19 is a time change chart of the motor rotation speed according to the first embodiment.

FIG. 20 is a perspective view of a computer unit according to the first embodiment.

FIG. 21 is a block diagram of an optical recording type recording / reproducing apparatus of Example 1.

FIG. 22 is a block diagram of an optical recording type recording / reproducing apparatus of Example 1.

[Explanation of symbols]

1 recording / reproducing apparatus (FIG. 1) 2 recording layer 3 recording medium 4 magnetic recording signal 5 magnetic head 5a MR magnetic head 5b ring magnetic head 6 recording / reproducing section 7 motor drive circuit 8 rotary motor 8a rotation generating section 9 power control section 10 slider 11 Flying Distance 12 Recording Track 13 Central Control Section 14 Recording / Reproducing Track Change Section 15 Slider Flying Height Control Section 16 Slider Press Change Section 17 Slider Spring 18 G Sensor 19 Track Drive Section 20 Slider Arm 21 Arm Elevating Section 22 Tracking Motor 23 Arm Elevating Shaft 24 arrow 25 reproducing unit 26 recording / reproducing clock reproducing unit 27 PLL 28 demodulating unit 29 pull-in reference frequency control unit 30 VCO 31 frequency divider 32 phase comparator 33 LPF 34 pull-in reference frequency 35 LPF 36 frequency f _c change Device 37 Differentiator 38 Punching part 39 Ring head output 40 MR head output 41 MR element 42 Bias voltage part 43 Resistance measuring part 44 Shield 45 Recording part 46 Modulator 47 Recording circuit 48 Recording / reproducing clock reproducing part 49 PLL 51 Spring characteristics 52 Digital Processing Section 55 Motor Rotation Speed Changing Section 56 Digital Section Operation Clock Changing Section 57 Reference Clock Generating Section 58 Internal Clock Generating Section 59 Interface Circuit 60 Input / Output Section 62 Filter Characteristics 63 Cashier Memory 64 Cash Memory Monitoring Section 65 Evacuation Track 67 Spring Power 68 Analog section Power control section 69 Memory backup section 100 Computer 101 CPU 102 Power control section 103 Interface section 104 Start / stop signal generating section 105 Keyboard 106 External network 107 Drive recording / playback data monitor

Claims (1)

[Claims] 1. A recording medium, a rotary motor for rotating the recording medium, a recording / reproducing head, a recording / reproducing circuit, and an external input / output unit. The recording medium is rotated by the rotating motor, and the recording medium is reproduced by the recording / reproducing head. In addition to recording and reproducing a recording signal on the recording / reproducing device, in a recording / reproducing apparatus that stops or starts the rotary motor when the amount of recording / reproducing data to be recorded / reproduced continues for a certain period of time, when the recording / reproducing data amount is small, A recording / reproducing apparatus characterized in that recording / reproducing is performed by rotating a motor at a low speed.