JPH08315500A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE: To obtain an information recording and reproducing device capable of reproducing processing already recorded information without stopping (interrupting) recording processing in the midst of the recording processing of information on a disk. CONSTITUTION: The device is equipped with a disk 1 capable of recording and erasing, such respectively independently controllable heads as a recording optical head 3, a recording magnetic head 4 and a reproducing optical head 11 and a system control microcomputer 20 for controlling the individual heads, controlling rotation of the disk and controlling the system. At the time of concurrently performing recording and reproducing, recording and reproducing are performed in a linear velocity invariable system by controlling the revolving speed of the disk 1 so that the linear velocity on a basis of a recording position of the recording optical head 3 should be >=R2/R1 times the actual linear velocity (R1 is a recordable innermost circumferential value and R2 is a recordable outermost circumferential value of the disk), while the linear velocity on a basis of reproducing position at the time of reproduction only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording / reproducing information on / from a disc-shaped recording medium, and particularly for reproducing the recording without stopping the recording even during the recording. And an information recording / reproducing apparatus capable of

[0002]

2. Description of the Related Art Compact discs (hereinafter referred to as CDs) are widely used as storage media using discs. There are CD-DA's for music and CD-ROM's for digital data, and their read-only devices have already been commercialized. Recently, a video CD has been commercialized, which is capable of compressing and recording a moving image and a sound on the CD and reproducing a video and a sound for 74 minutes.

Further, a CD-WO (W
write-once), CD-MO (Magneto Optics) capable of recording and erasing by magneto-optical, and a phase-change disc capable of recording and erasing by reversible change of crystalline and amorphous. The range of use is expanding.

Conventionally, as a recordable storage medium, a VTR (Video Tape) using a magnetic tape is used.
Recorder) is widely used. But V
In TR, it is impossible to reproduce already recorded information during recording. For example, during timer recording,
We could not meet the demand to watch the program that is currently being recorded from the beginning. In this case, it is necessary to perform the reproduction process without stopping the recording process, and as an example of a recording / reproduction device that realizes this, an optical disk device disclosed in Japanese Patent Laid-Open No. 3-263672 has been proposed. This apparatus is provided with a plurality of independently controllable optical heads for one disk and an input / output requesting means for designating which optical head is to perform recording / reproducing, thereby providing a plurality of optical heads. The configuration allows simultaneous recording and reproduction.

[0005]

However, in the above-mentioned conventional optical disk device, when a plurality of optical heads are simultaneously recording / reproducing on / from one disk, which optical head is to be recorded / reproduced at the same position. Even if they are different, the CAV recording / reproducing system is used in which the disc rotation speed is always controlled to be constant.

On the other hand, CLV considering long-time recording
There is a recording / reproducing system such as recording. In this method, the number of rotations of the disc is changed according to the radial position of the disc to be recorded / reproduced for recording / reproduction. The above-mentioned conventional optical disc device is a CAV in which the number of revolutions of the disc is constant.
It is compatible with the system, and is not considered to be compatible with the recording / reproducing like the CLV system.

An object of the present invention is to solve the above-mentioned problems of the prior art, and in consideration of long-time recording, in the CLV system, while recording is performed from the inner circumference to the outer circumference by the recording head, the reproduction is performed simultaneously. It is an object of the present invention to provide an information recording / reproducing apparatus capable of reproducing information with a recording head.

[0008]

In order to achieve the above object, according to the present invention, recording means capable of writing information to a recording medium by controlling independently and information from the recording medium by controlling independently. Reproducing means capable of reading out the data, first storage means for temporarily storing a recording signal,
The second storage means for temporarily storing the reproduction signal and R2 /
Linear velocity equal to or higher than R1 (here, R1 is the innermost circumference of the recording surface of the recording medium, and R2 is the outermost circumference of the recording surface of the recording medium.)
And a first rotation control means for controlling the rotation of the recording medium.

As another means for achieving the above object, the present invention is provided with position detecting means for detecting the positions of the recording means and the reproducing means, and the linear velocity depending on the position of the recording or reproducing means on the inner circumference side of the recording medium. A second rotation control means for controlling the rotation of the recording medium is provided so that

As another means for achieving the above object, the present invention is provided with position detecting means for detecting the positions of the recording means and the reproducing means, and the linear velocity depending on the position of the recording or reproducing means on the outer peripheral side of the recording medium. R2 / R1 times or more (where R
1 is the innermost circumference of the recording surface of the recording medium, and R2 is the outermost circumference of the recording surface of the recording medium. (3) is provided with a third rotation control means for controlling the rotation of the recording medium so that the linear velocity becomes.

As another means for achieving the above object, in the present invention, the recording means, the reproducing means, a third storing means for temporarily storing a recording signal, and a first writing means for writing information in the first storing means. One write control means, a second read control means for reading information from the third storage means, and a first storage amount detection means for detecting the storage amount of the third storage means are provided. When the amount becomes less than or equal to a predetermined amount, reading from the third storage means is stopped, and at the same time, the recording means for writing information to the recording medium is moved one position from the position to the inner peripheral side, And control for restarting the reading from the first storage means after returning to the position immediately before the movement of the recording means after the recording medium makes one round, and for restarting the writing of information to the recording medium. And means for further reproduction Is temporarily stored, a second write control means for writing information to the fourth storage means, a second read control means for reading information from the fourth storage means, and a fourth read control means for reading information from the fourth storage means. Second storage amount detecting means for detecting the storage amount of the storage means is provided, and when the storage amount exceeds a predetermined amount, writing to the fourth storage means is stopped, and at the same time, the recording medium The information is read from the reproducing means by moving the reproducing means one position toward the inner circumference side, and after the recording medium makes one round and returns to the position just before the reproducing means moves, writing to the fourth storage means. And a control means for controlling so that the reading of information from the storage medium is restarted.

[0012]

Since the recording means and the reproducing means can be controlled independently of each other, the recorded signal can be read by the reproducing means even during the recording by the recording means.

The first rotation control means always maintains R2 / R1.
The rotation of the recording medium is controlled so that the linear velocity is double or more (here, R1 is the innermost circumferential value of the recording surface of the recording medium, and R2 is the outermost circumferential value of the recording surface of the recording medium). Since recording and reproduction are performed at a speed higher than the normal linear velocity, by providing the first storage means and the second storage means, it is possible to perform recording and reproduction at the same time without loss of information. Become.

The second rotation control means detects the positions of the recording means and the reproducing means by the position detecting means, detects which one is located on the inner circumference side based on the detection result, and detects the position on the inner circumference side. The rotation of the recording medium is controlled so that the linear velocity of the recording medium is adjusted to the linear velocity of the other side. At this time, since the recording or reproducing means located on the outer peripheral side is recording and reproducing at a speed higher than the normal linear velocity, By providing the storage means and the second storage means, recording and reproduction can be performed at the same time without loss of information.

The third rotation control means detects the positions of the recording means and the reproducing means by the position detecting means, detects which is located on the outer peripheral side based on the detection result, and determines which one is on the outer peripheral side. The recording medium is rotated so that the linear velocity becomes equal to or higher than R2 / R1 times (where R1 is the innermost circumferential value of the recording surface of the recording medium and R2 is the outermost circumferential value of the recording surface of the recording medium). At this time, the recording or reproducing means located on the inner peripheral side is controlled to record and reproduce at a speed higher than the normal linear velocity. Therefore, by providing the first storing means and the second storing means, It is possible to perform recording and reproduction at the same time without any omission.

The first writing means writes the recording signal in the third storage means at a rate according to the transfer rate of the recording signal, and the first reading control means always writes the recording signal in the recording medium at the third rate. Since the recording signal is read from the storage means, it is possible to record a signal having a different transfer rate of the recording signal for each period on the recording medium.

The first accumulated amount detecting means detects the accumulated amount of the third storage means, and the first read control means interrupts the reading when the accumulated amount becomes less than a predetermined amount, Further, the recording means on the recording medium is moved to the inner circumference side and after waiting for a period of one round of the recording medium, the reading from the third storage means is restarted, so that the underflow of the third storage means is prevented. Can be avoided. Further, since the time required for the recording medium to make one round becomes the longest when the recording means for the recording medium is at the outermost circumference of the recording medium, it is written at the time of making one round at the transfer rate written to the recording medium. As long as it has a capacity larger than the amount of information, overflow of the third storage means can be avoided.

The second writing control means writes the reproduction signal in the fourth storage means at a transfer rate from the recording medium,
The second read control means can read the reproduction signal from the fourth storage means at a rate corresponding to the reproduction signal having a different transfer rate for each period.

The second accumulated amount detecting means detects the accumulated amount of the fourth storage means, and the second write control means interrupts the writing when the accumulated amount exceeds a predetermined amount, Further, the reading means from the recording medium is restarted after moving the reproducing means to the recording medium toward the inner circumference side and waiting for a period of one round of the recording medium, so that overflow of the fourth storage means can be avoided. . Furthermore, since the time required for the recording medium to make one round becomes the longest when the reproducing means for the recording medium is at the outermost circumference of the recording medium, it is read at the time of making one round at the transfer rate read from the recording medium. As long as it has a capacity equal to or more than the amount of information, underflow of the fourth storage means can be avoided.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings.

This embodiment will be described by taking a magnetic field modulation type magneto-optical disk recording / reproducing apparatus as an example, but the present invention is not limited to this. For example, a phase change type optical disk recording / reproducing apparatus, a laser power intensity modulation type magneto-optical disk. It can also be applied to a recording / reproducing device.

First, a first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a block diagram showing the configuration of a first embodiment of an information recording / reproducing apparatus according to the present invention.

Reference numeral 1 is a disk which is a magnetic recording medium, and is rotated by a motor 2 which is a disk rotating means. In the disk 1, the guide groove is slightly wobbled at an arbitrary interval in the track radius direction by pre-groove modulation in consideration of CLV recording. Three
Is an optical head for recording. Reference numeral 4 denotes a magnetic head, which is attached at a position facing the recording optical head 3 with the disk 1 interposed therebetween. The magnetic head 4 is moved together with the recording optical head 3 in the disk radial direction.

The recording signal is temporarily held in the buffer memory 5 and sent out at the rate at which it is recorded on the disc 1. A scramble circuit 6 performs scramble processing on the recording signal. Reference numeral 7 denotes a digital signal processing circuit, which performs signal processing according to the recording format of the disc 1, such as addition of error correction code, interleaving, and modulation, on the scrambled recording signal, and outputs the modulated signal 101. Reference numeral 8 denotes a magnetic head control circuit, which controls the magnetic head 4 according to the modulation signal 101 during recording.
Is driven to apply a modulation magnetic field to the disk 1.

Reference numeral 9 is a recording system signal processing circuit, and a focus error signal and a tracking error signal 1 for controlling the recording optical head 3 from the input reflected light signal 102.
03 and the linear velocity controlling clock signal 104 generated from the wobbling signal for controlling the motor 2. 10 is a focus and tracking control circuit,
Based on a control signal 103 for controlling the recording optical head 3, each control of focus, tracking control and transfer control is performed.

Reference numeral 11 is a reproducing optical head, which is a reflected light signal 10 obtained from the reflected light from the disk 1 during reproduction.
5 is output. Reference numeral 12 is a reproduction system signal processing circuit, which is a linear velocity control for generating a control signal 106 such as a focus error signal and a tracking error signal for controlling the reproduction optical head 11 from a wobbling signal for controlling the motor 2. Clock signal 107 and reproduction signal 108
Is output.

A focus / tracking control circuit 13 performs focus, tracking control, and transfer control based on a control signal 106 for controlling the reproducing optical head 11. A switching circuit 14 selects a linear velocity control clock signal 104 output from the recording system signal processing circuit 9 and performs only reproduction according to a command from the system control microcomputer when recording and simultaneously performing recording and reproduction. At this time, the linear velocity control clock signal 107 output from the reproduction system signal processing circuit 12 is selected and output to the motor control circuit 15 as the rotation control signal 109. The rotation speed of the disk 1 is controlled by a control signal from the motor control circuit 15.

Reference numeral 16 is a clock generation circuit, which generates a clock for the digital signal processing circuit 7, a clock for the digital signal processing circuit 17, a clock 111 for the motor control circuit 15 and the like with reference to the system clock 110. Output.

Reference numeral 17 denotes a digital signal processing circuit, which performs signal processing such as error correction on the reproduced signal 108 in accordance with the recording format of the disk 1. Reference numeral 18 denotes a descramble circuit, which detects a sync signal in the digital signal processed signal and descrambles the signal, and outputs the signal as a reproduced signal. Reference numeral 19 denotes a buffer memory, which temporarily holds the reproduction signal and outputs it at a rate suitable for the reproduction signal.

Reference numeral 20 is a system control microcomputer, and the buffer memories 5 and 6 are controlled by control signals 112 to 121.
Write / read control, focus control, tracking control circuits 10 and 13, motor control circuit 15 and switching circuit 14, and system control of the information recording / reproducing apparatus.

Next, the disc rotation control operation of the information recording / reproducing apparatus according to the first embodiment shown in FIG. 1 will be described with reference to FIG.

FIG. 2 is a diagram showing a case where the recording optical head 3 is located at the outermost circumference and the reproducing optical head 11 is located at the innermost circumference. The fan-shaped drawing shown at the bottom of the disk 1 in the drawing shows the disk surface of the disk 1.

When it is considered to control the number of rotations of the disc 1 so that the linear velocity is constant with reference to the recording side, the difference in the number of rotations of the disc is that the recording optical head is at the outermost periphery and the reproduction optical It becomes the largest when the head is at the innermost circumference, and the ratio is the innermost circumference position R1; 50 of the recording surface of the disk 1.
mm, outermost position of recording surface R2; 116 mm to 116
/ 50 (= 2.32) can be obtained. That is, the rotation speed of the disk at the innermost circumference is 2.32 times the rotation speed of the disk at the outermost circumference. Therefore, when the recording head is at the outermost circumference and the reproducing head is at the innermost circumference, the linear velocity at which the reproduced signal can be reproduced without interruption is 116/50 of the linear velocity based on the position of the recording optical head.
(= 2.32) times. Therefore, it is necessary to control the rotational speed of the disk 1 so that the linear velocity as described above is obtained.

Generally, the rotation control of the disc is performed by the linear velocity control clock signal 1 output from the recording system signal processing circuit 9.
04 and the motor control clock signal 111 output from the clock generation circuit 16. The motor control circuit 15 counts the motor control clock signal 111 within one cycle of the linear velocity control clock signal 104, and controls the voltage supplied to the motor 2 so that the counted number becomes a predetermined value. Control the rotation speed of the disc.

Therefore, in order to control the rotational speed of the disc as described above, the linear velocity control clock signal output from the recording system signal circuit 9 is divided into three (116 /
The value is 50 = 2.32 or more, for example, 3. ) And output it as a new linear velocity control clock signal 104, the motor control circuit 15 always outputs the actual linear velocity of 3
The number of rotations of the disk 1 is controlled so as to double the number.

As another example, the clock generation circuit 1
The motor control clock signal output from 6 is tripled (1
A value of 16/50 = 2.32 or more, for example, 3 is set. ) And output it as a new motor control clock signal 111, the motor control circuit 15 controls the rotation speed of the disk 1 so that it is always three times the actual linear velocity.

The manner of recording and reproduction when the rotation speed of the disk 1 is controlled in this way will be described with reference to FIG.

The magnetic head 4 and the recording optical head 3 are A
The reproducing optical head 11 is located at the position B, and the recording and reproducing processes are performed respectively. As described above, the rotation control of the disc 1 is controlled to three times the actual linear velocity. When the recording signal is the information from the disk surface a to b, the rotation amount of the disk 1 is from a to c, which is three times as large as from a to b. System control microcomputer 20
Controls the recording signal to continuously record from the disk surface a to b, and waits (pauses) the magnetic head 4 and the recording optical head 3 at the position b from the disk surface b to c. And the reproduction signal is controlled so as to continuously reproduce from the disk surface d to e (the data amount is equal to a to b), and the reproduction optical head 11 is reproduced from the disk surface f to g. Wait at position f (pause)
The write control to the buffer memory 19 is prohibited.

The magnetic head 4 and the recording optical head 3 are
The same operation is performed when it is located on the inner side of the reproducing optical head 11.

As described above, according to the first embodiment of the present invention, the rotational speed of the disk in the information recording / reproducing apparatus for recording / reproducing at a constant linear velocity is always R2 / R1 of the linear velocity with reference to the recording position. The positions of the recording optical head and the reproducing optical head are controlled by controlling the linear velocity to be equal to or more than twice (where R1: the recordable innermost peripheral value of the disc, R2: the recordable outermost peripheral value of the disc). The reproduction process can be performed without stopping the recording process regardless of the recording process.
In addition, recording / reproducing by the constant linear velocity method enables recording / reproducing for a longer time than that by the constant angular velocity method.

Next, a second embodiment of the present invention will be described in detail with reference to FIG. FIG. 4 is a block diagram showing the configuration of an information recording / reproducing apparatus according to the second embodiment of the present invention. The same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 122 is a recording time code signal indicating the recording position of the recording optical head 3, and is generated from the reflected light signal 102 in the recording system signal processing circuit 9. A reproduction time code signal 123 indicates the reproduction position of the reproduction optical head 11 and is generated from the reflected light signal 105 in the reproduction system signal processing circuit 12.

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

The system control microcomputer 20 determines from the recording time code signal 122 and the reproduction time code signal 123 that
Which of the recording optical head 3 and the reproducing optical head 11 is located on the inner peripheral side is detected. Then, a control signal 120 is output to the switching circuit 14 so that the motor control clock signal output from the signal processing circuit located on the inner peripheral side becomes the motor rotation control signal 109.

The above operation will be described with reference to FIG.

The case where the reproducing optical head 11 is located on the inner circumference side of the magnetic head 4 and the recording optical head 3 is taken as an example. The reproducing optical head 11 is located at the position A of the disk 1, and the magnetic head 4 and the recording optical head 3 are located at the position B. First, the system control microcomputer 20
Detects which optical head is on the inner circumference side from the above-mentioned time code signal. In this case, it is detected that the reproducing optical head is on the inner peripheral side, and the linear velocity controlling clock signal 1 output from the reproducing system signal processing circuit 12 is detected.
The switching circuit 14 is controlled so that 07 becomes the rotation control signal 109 of the motor, and the disc 1 is rotated at the linear velocity according to the reproducing position on the inner peripheral side. By performing such control, the reproducing optical head 11 located at the position A is controlled so as to continuously reproduce the disk surfaces a to b, and the recording optical head 3 located at the position B is located at the disk surface. Recording is continuously performed from c to d, and during the period from d to e, it is controlled to stand by (pause) at the position of d, and the reading from the buffer memory 5 is prohibited.

The magnetic head 4 and the recording optical head 3 are
The same operation is performed when it is located on the inner side of the reproducing optical head 11.

As described above, according to the second embodiment of the present invention, the rotational speed of the disk in the information recording / reproducing apparatus for recording / reproducing at a constant linear velocity is set so that which optical head is always located on the inner peripheral side. By detecting whether there is an optical head and controlling it so that the linear velocity is based on the optical head located on the inner circumference side, recording processing can be performed during recording regardless of the positions of the recording optical head and the reproducing optical head. Reproduction processing can be performed without stopping. In addition, recording / reproducing by the constant linear velocity method enables recording / reproducing for a longer time than that by the constant angular velocity method.

Next, a third embodiment of the present invention will be described in detail with reference to FIG. The block diagram of the information recording / reproducing apparatus according to the third embodiment of the present invention is the same as that of the second embodiment.
The difference from the second embodiment is the method of controlling the rotational speed of the disk.

In the third embodiment of the present invention, the disc 1 is always rotated with the optical head located on the outer peripheral side of the disc as a reference, and the linear velocity is controlled to be constant. The operation will be described in detail below.

The system control microcomputer 20 determines from the recording time code signal 122 and the reproduction time code signal 123 that
Which of the recording optical head 3 and the reproducing optical head 11 is located on the outer peripheral side is detected. Then, the control signal 120 is output to the switching circuit 14 so that the motor control clock signal output from the signal processing circuit located on the outer peripheral side becomes the motor rotation control signal 109. At this time, similar to the first embodiment, when the recording optical head is at the outermost circumference and the reproducing optical head is at the innermost circumference, the linear velocity at which the reproduced signal can be reproduced without interruption is
A linear velocity of 11 relative to the position of the recording optical head
It becomes 6/50 (= 2.32) times, and it is necessary to control the number of rotations of the disk 1 so as to obtain such a linear velocity.

Therefore, in order to control the rotational speed of the disk as described above, as an example, the linear velocity control clock signal output from the signal processing circuit located on the outer peripheral side is divided by 3 (116/50). = 2.32 or more, for example, 3) and output it as a new linear velocity control clock signal, so that the motor control circuit 15 can always make the disc linear velocity 3 times the actual linear velocity. Control the rotation speed of.

As another example, the clock generation circuit 1
The motor control clock signal output from 6 is tripled (1
A value of 16/50 = 2.32 or more, for example, 3 is set. ) And output it as a new motor control clock signal 111, the motor control circuit 15 controls the rotation speed of the disk 1 so that it is always three times the actual linear velocity.

As described above, according to the third embodiment of the present invention, which optical head is always positioned on the outer peripheral side is the rotation number of the disk in the information recording / reproducing apparatus for recording / reproducing at a constant linear velocity. Is detected, and R2 / R1 times or more of the linear velocity based on the optical head located on the outer peripheral side (here,
(R1: recordable innermost circumference value of the disc, R2: recordable outermost circumference value of the disc) so that the linear velocity is controlled so that recording is performed regardless of the positions of the recording optical head and the reproducing optical head. Also in the above, the reproducing process can be performed without stopping the recording process. In addition, recording / reproducing by the constant linear velocity method enables recording / reproducing for a longer time than that by the constant angular velocity method.

The above-described embodiments have all assumed the case of a fixed transfer rate. In the following embodiments, a case will be described in which a signal having a variable transfer rate, which has a different transfer rate for each period, is considered.

The fourth embodiment of the present invention will be described in detail with reference to FIG. FIG. 6 is a block diagram showing the configuration of the fourth embodiment of the information recording / reproducing apparatus according to the present invention. The parts corresponding to those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 30 denotes a buffer memory, which controls the input / output of the recording signal by the write address by the write control circuit 31 and the read address by the read control circuit 32. Reference numeral 31 denotes a write control circuit, which generates a write address according to the rate of a recording signal having a transfer rate different for each period, and a variable transfer rate rb.
Writing to the buffer memory 30 is controlled by [bits / sec]. Reference numeral 32 denotes a read control circuit, which generates a read address according to the transfer rate rd [bits / sec] for recording on the disc 1 and stores the read address in the buffer memory 30.
Control the reading of the recording signal from the.

Reference numeral 33 is a storage amount detection circuit, which detects the storage amount of the buffer memory 30 from the addresses of the write control circuit 31 and the read control circuit 32. Reference numeral 34 denotes a buffer memory, which controls the input / output of the reproduction signal by the write address by the write control circuit 35 and the read address by the read control circuit 36. 35
Is a write control circuit, which generates a write address and controls writing of a reproduction signal to the buffer memory 34. Reference numeral 36 denotes a read control circuit, which generates a read address according to the rate of the reproduction signal having a transfer rate that differs for each period, and controls the readout of the reproduction signal from the buffer memory 34.

Reference numeral 37 is a storage amount detection circuit, which detects the storage amount of the buffer memory 34 from the addresses of the write control circuit 35 and the read control circuit 36. Reference numeral 38 is a system control microcomputer, and based on the control signals thereof, a write control circuit 31, a read control circuit 32 on the recording signal side, and a write control circuit 35, a read control circuit 36 on the reproduction signal side
Control and focus / tracking control circuit 10,
13, control of the motor control circuit 15 and the switching circuit 14,
And system control of the information recording / reproducing apparatus.

FIG. 7 shows an example of the recording signal of the fourth embodiment. As shown in the figure, the fixed transfer rate signal is a signal whose transfer rate is always constant for each predetermined period, whereas the variable transfer rate signal is a signal whose transfer rate changes for each predetermined period. Therefore, it is necessary to absorb the fluctuation of the transfer rate by some means. Hereinafter, recording of the variable transfer rate signal in the fourth embodiment,
The reproduction operation will be described in detail with reference to the drawings. Regarding the specific method of this, the present inventors have filed Japanese Patent Application No. 6-1305.
No. 50 and Japanese Patent Application No. 6-174994 have already been applied. The recording operation will be described with reference to FIG. First, the case of recording the data shown in FIG. 8 on the disc 1 will be described. Since the recording on the disk 1 is performed at the fixed transfer rate rd, the variable transfer rate rb of the recording signal needs to satisfy the condition of rb ≦ rd. For example, when rd = r2 (maximum rate during that period), the buffer memory 30 underflows during periods t1 to t2 and t3 to t4, as is clear from the figure. Therefore, the storage amount detection circuit 33 monitors the storage amount of the buffer memory 30 based on the addresses from the write control circuit 31 and the read control circuit 32.
Then, the system control microcomputer 38 controls the focus / tracking control circuit 10 which controls the recording optical head 3 based on the accumulated amount, whereby the buffer memory 3 is controlled.
Avoid 0 underflow.

9 and 10 are diagrams for explaining the above operation in detail. FIG. 9 is a diagram showing a state of tracks formed on the disk 1, which are (m-1), m, and (m +).
1), ..., (m + n), (m + n + 1) (where
m and n are natural numbers. ) Represents each writing unit, and P1
To P3 represent the write position of the head. FIG. 10 is a diagram showing how data is input / output to / from the buffer memory.

In FIG. 9, the recording optical head 3 moves on the disk 1 from P1 to P3 to record a signal, and the signal is continuously recorded in order from m. When recording a variable transfer rate signal, the input rate rb to the buffer memory 30 and the output rate rd from the buffer memory 30 are different, and the buffer memory 30 underflows at a certain time point t5 (see FIG. )).
Therefore, the accumulation amount detection circuit 33 outputs an underflow signal (FIG. 10B) of the buffer memory 30 to the system control microcomputer 38, and the system control microcomputer 38 interrupts the reading of the recording signal from the buffer memory 30. The focus / tracking control circuit 10 is controlled so that the recording optical head 3 jumps to the inner side of one track. At this time, the recording optical head 3 is P
Jump 1 track from 3 to P1 again P1-P2-P
Move to 3 (Recording to disc 1 is not performed). Then, when the recording optical head 3 returns to the position P3 again (time t6), reading of data from the buffer memory 30 is started again. Buffer memory 3
0 may have a capacity that does not cause an overflow while the recording optical head 3 jumps one track.

Next, the operation during reproduction will be described with reference to FIG. First, the case of reproducing the data shown in FIG. 11 from the disc 1 will be described. Since the reproduction from the disc 1 is performed at the fixed transfer rate rd, the variable transfer rate rb of the reproduction signal needs to satisfy the condition of rb ≦ rd. For example, when rd = r2 (maximum rate during that period), as is clear from the figure, the periods t1 to t
The buffer memory 34 overflows from 2 and from t3 to t4. Therefore, the accumulated amount detection circuit 37
Monitors the storage amount of the buffer memory 34 by the addresses from the write control circuit 37 and the read control circuit 38. Then, the system control microcomputer 38 avoids the underflow of the buffer memory 34 by controlling the focus / tracking control circuit 13 which controls the reproducing optical head 11 from the accumulated amount.

Similar to the recording operation, the above operation will be described in detail with reference to FIGS. 9 and 11.

In FIG. 11, the reproducing optical head 11 is used.
Moves from P1 to P3 on the disk 1 to reproduce a signal, and the signal is continuously reproduced in order from m. When trying to reproduce the variable transfer rate signal, the buffer memory 3
4 and the output rate rb from the buffer memory 34 are different, and the buffer memory 34 overflows at a certain time point t5 (see FIG. 11).
(D)). Therefore, the accumulation amount detection circuit 37 outputs an overflow signal (FIG. 11B) of the buffer memory 34 to the system control microcomputer 38, and the system control microcomputer 3
Reference numeral 8 controls so as to interrupt the writing of the reproduction signal from the buffer memory 34, and further controls the focus / tracking control circuit 13 so that the reproduction optical head 11 jumps inward by one track. At this time, the reproducing optical head 11 jumps one track from P3 to P1 and moves again to P1-P2-P3. Then, when the reproducing optical head 11 returns to the position P3 again (time t6), writing of data to the buffer memory 34 is started again. Further, the buffer memory 34 should have a capacity that does not cause underflow while the reproducing optical head 11 jumps one track.

As described above, the operation for recording and reproducing the variable transfer rate signal has been described. Next, the disk rotation control operation will be described.

In the rotation control of the disc 1 in the fourth embodiment, the rotation speed of the disc 1 is controlled so that the linear velocity becomes constant with reference to the recording side, as in the first embodiment of the present invention.

Therefore, as in the first embodiment, the linear velocity control clock signal output from the recording system signal circuit 9 is set to 3 times.
By dividing the frequency (116/50 = 2.32 or more, for example, 3) and outputting as a new linear velocity control clock signal 104, the motor control circuit 15 always outputs the actual linear velocity 3 times. The number of rotations of the disk 1 is controlled so as to double the number.

Alternatively, the motor control clock signal output from the clock generation circuit 16 is tripled (116/50 =
The value is 2.32 or more, for example, 3. ) And output it as a new motor control clock signal 111, the motor control circuit 15 controls the rotation speed of the disk 1 so that it is always three times the actual linear velocity.

As described above, according to the fourth embodiment of the present invention, when the variable transfer rate information is recorded / reproduced, the amount of data stored in the buffer memory is monitored to control the writing / reading of data to / from the disk. And ensuring a sufficient capacity for performing these controls, it is possible to avoid overflow and underflow of the buffer memory. Further, the number of rotations of the disc in the information recording / reproducing apparatus for recording / reproducing at a constant linear velocity is always R2 / R1 times or more of the linear velocity based on the recording position (where R1:
By controlling the linear velocity of the recordable innermost peripheral value of the disc and R2: the recordable outermost peripheral value of the disc), the recording optical head and the reproducing optical head are controlled in the same manner as in the first embodiment. The reproduction process can be performed without stopping the recording process during recording regardless of the position. In addition, recording / reproducing by the constant linear velocity method enables recording / reproducing for a longer time than that by the constant angular velocity method.

Next, a fifth embodiment of the present invention will be described in detail with reference to FIG. FIG. 12 is a block diagram showing the structure of an information recording / reproducing apparatus according to the fifth embodiment of the present invention. The same parts as those in the fifth embodiment shown in FIG. 6 are designated by the same reference numerals and the description thereof will be omitted.

A recording time code signal 122 indicates the recording position of the recording optical head 3, and is generated from the reflected light signal 102 in the recording system signal processing circuit 9. A reproduction time code signal 123 indicates the reproduction position of the reproduction optical head 11 and is generated from the reflected light signal 105 in the reproduction system signal processing circuit 12.

The rotation control of the disk 1 in the fifth embodiment detects, similarly to the second embodiment of the present invention, which of the optical heads is located on the inner circumference side of the disk, and the inner circumference side is detected. The number of rotations of the disk 1 is controlled so that the linear velocity becomes constant on the basis of which one is present. That is, the recording optical head 3
Is located on the inner peripheral side, the switching circuit 14 is controlled so that the linear velocity control clock signal 104 is output as the motor control signal 109, and the reproduction optical head 11 is produced.
Is located on the inner peripheral side, the switching circuit 14 is controlled so that the linear velocity control clock signal 107 is output as the motor control signal 109.

As described above, according to the fifth embodiment of the present invention, similarly to the fourth embodiment, the storage amount of the buffer memory is monitored to control the writing and reading of data to the disk, In addition, by ensuring a sufficient capacity for performing these controls, it is possible to avoid overflow and underflow of the buffer memory. In addition, the number of rotations of the disk in an information recording / reproducing apparatus that records and reproduces at a constant linear velocity is detected by always detecting which optical head is located on the inner circumference side, and a line based on the optical head located on the inner circumference side By controlling the speed so that the second
Similar to the embodiment described above, the reproducing process can be performed without stopping the recording process during recording regardless of the positions of the recording optical head and the reproducing optical head. In addition, recording / reproducing by the constant linear velocity method enables recording / reproducing for a longer time than that by the constant angular velocity method.

Next, a sixth embodiment of the present invention will be described in detail with reference to FIG. The block diagram of the information recording / reproducing apparatus according to the sixth embodiment of the present invention is the same as that of the fifth embodiment. The difference from the fifth embodiment is the method of controlling the rotational speed of the disk.

In the rotation control of the disk 1 in the sixth embodiment, as in the case of the third embodiment of the present invention, which one of the optical heads is located on the outer peripheral side of the disk is detected and the one on the outer peripheral side is detected. The rotational speed of the disk 1 is controlled so that the linear velocity becomes constant on the basis of.

That is, similarly to the third embodiment, which of the optical heads is located on the outer peripheral side is detected from the time code signals 122 and 123, and the signal processing circuit on the outer peripheral side is detected. A control signal 120 is output to the switching circuit 14 so that the output motor control clock signal becomes the motor rotation control signal 109. At this time, as in the first embodiment, when the recording optical head is at the outermost circumference and the reproducing optical head is at the innermost circumference, the linear velocity at which the reproduced signal can be reproduced without interruption is the same as that of the recording optical head. The linear velocity is 116/50 (= 2.32) times the linear velocity based on the position of, and it is necessary to control the rotation number of the disk 1 so that the linear velocity becomes such a linear velocity.

Therefore, in order to control the rotational speed of the disk as described above, the linear velocity control clock signal output from the signal processing circuit located on the outer peripheral side is divided by 3 (11).
A value of 6/50 = 2.32 or more, for example, 3 is set. ) And output as a new linear velocity control clock signal, the motor control circuit 15 controls the rotational speed of the disk 1 so that it is always three times the actual linear velocity.

Alternatively, the motor control clock signal output from the clock generation circuit 16 is tripled (116/50 =
The value is 2.32 or more, for example, 3. ) And output it as a new motor control clock signal 111, the motor control circuit 15 controls the rotation speed of the disk 1 so that it is always three times the actual linear velocity.

As described above, according to the sixth embodiment of the present invention, similarly to the fourth embodiment, the storage amount of the buffer memory is monitored to control the writing and reading of data to the disk, In addition, by ensuring a sufficient capacity for performing these controls, it is possible to avoid overflow and underflow of the buffer memory. In addition, the number of rotations of the disk in the information recording / reproducing apparatus for recording / reproducing at a constant linear velocity is detected by always detecting which optical head is located on the outer peripheral side, and determining the linear velocity based on the optical head located on the outer peripheral side. By controlling the linear velocity to be R2 / R1 times or more (here, R1: the recordable innermost circumference value of the disc, R2: the recordable outermost circumference value of the disc),
Similar to the third embodiment, the reproducing process can be performed without stopping the recording process during recording regardless of the positions of the recording optical head and the reproducing optical head. In addition, recording / reproducing by the constant linear velocity method enables recording / reproducing for a longer time than that by the constant angular velocity method.

In the above fourth, fifth, and sixth embodiments, the configuration has been described in which the recording head or the reproducing head is controlled when the buffer memory is in the empty or full state. Set a certain threshold,
It may be configured to monitor and control the storage amount of the buffer memory.

In all of the above embodiments, the case where recording and reproduction are performed at the same time has been described as an example.
In the case where only reproduction is performed, the present invention is not limited to this. For example, the linear velocity control clock signal 107 output from the reproduction system signal processing circuit 12 may be the motor control signal 1
The system control microcomputers 20 and 38 are configured so as to control the switching circuit 14 so as to be 09.

Furthermore, in all of the above embodiments, the case where the data is recorded by forming the tracks on the spiral has been described, but the present invention is not limited to this.
For example, the present invention can be applied to the case of a hard disk (magnetic disk) where data is recorded and reproduced by forming a plurality of concentric tracks.

In all of the above embodiments, the information recording / reproducing apparatus of the CLV system in which the linear velocity is constant has been described. However, this is not limited to this, for example, the disc is divided into areas, and the areas are divided into areas. The present invention can also be applied to an information recording / reproducing apparatus of the zone CAV method in which the angular velocity is controlled to be constant.

Furthermore, in all of the above embodiments, one recording head and one reproducing head are provided, but the present invention is not limited to this, and information recording having a plurality of recording heads and a plurality of reproducing heads. The present invention can be applied to a reproducing device.

[0086]

As described above, according to the present invention,
By providing a recording optical head and a reproducing optical head that can be controlled independently of each other, and controlling the number of rotations of the disk so that the linear velocity becomes constant based on the recording optical head or the position of the optical head. Even during the recording process, the reproducing process can be performed without stopping the recording process.

Further, according to the present invention, the buffer memory is provided, the data is written at the transfer rate according to the recording signal, the data is read at the fixed transfer rate and recorded on the disk, so that the transfer rate can be obtained every period. Different variable transfer rate signals can be recorded. Furthermore,
By providing a buffer memory to read and write data from the disk at a fixed transfer rate, and read from the buffer memory at a transfer rate according to a reproduction signal, it is possible to reproduce a variable transfer rate signal having a different transfer rate for each period.

Further, according to the present invention, since the recording / reproducing is performed by the CLV system so that the linear velocity becomes constant, the data recording / reproducing time can be extended.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a ratio of rotation speeds of an inner peripheral side and an outer peripheral side of the disk 1.

FIG. 3 is a diagram for explaining the operation of the recording optical head and the reproducing optical head of the example.

FIG. 4 is a block diagram showing an information recording / reproducing apparatus according to second and third embodiments of the present invention.

FIG. 5 is a diagram for explaining operations of a recording optical head and a reproducing optical head according to a second embodiment.

FIG. 6 is a block diagram showing an information recording / reproducing apparatus according to a fourth embodiment.

FIG. 7 is a diagram showing an example of a variable transfer rate signal.

FIG. 8 is a diagram showing a change in transfer rate of a variable transfer rate signal.

FIG. 9 is a diagram showing an example of tracks formed on a disc.

FIG. 10 is a diagram for explaining how data is written to the disc and data is input / output to / from the buffer memory during recording.

FIG. 11 is a diagram for explaining how data is written to the disc and data is input / output to / from the buffer memory during reproduction.

FIG. 12 is a block diagram showing an information recording / reproducing apparatus according to fifth and sixth embodiments.

[Explanation of symbols]

1 Disk 2 Motor 3 Recording Optical Head 4 Magnetic Head 5, 19, 30, 34 Buffer Memory 6 Scramble Circuit 7, 17 Digital Signal Processing Circuit 8 Magnetic Head Control Circuit 9 Recording System Signal Processing Circuit 10, 13 Focus, Tracking Control Circuit 11 reproduction optical head 12 reproduction system signal processing circuit 14 switching circuit 15 motor control circuit 16 clock generation circuit 18 de-scramble circuit 20, 38 system control microcomputer 31, 35 write control circuit 32, 36 read control circuit 33, 37 accumulated amount Detection circuit 101 Modulated signal 102, 105 Reflected light signal 103, 106 Focus error signal, tracking error signal 104, 107 Linear velocity control clock signal 110 System clock 111 Motor control clock signal 112 Control signal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 20/00 G11B 20/00 Z

Claims (11)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing information from an inner peripheral side to an outer peripheral side of a disk-shaped recording medium, comprising: first storage means for temporarily storing input information;
Recording means for writing information to the disc-shaped recording medium, reproducing means for reading information from the disc-shaped recording medium, second storage means for storing information reproduced from the disc-shaped recording medium, and the disc-shaped recording Rotation control means for controlling the number of rotations of the medium is provided, and the recording means and the reproduction means control recording operation and reproduction operation independently of each other, and the rotation control means, for the disc-shaped recording medium, When the information is recorded by the recording means, the information recorded on the disc-shaped recording medium is reproduced by the reproducing means without stopping the recording means, and the recording and the reproducing can be performed at the same time. An information recording / reproducing apparatus characterized by: 2. The information recording / reproducing apparatus according to claim 1, wherein the rotation control means, when recording and recording and reproduction are performed simultaneously, the speed based on the recording position of the recording means is always the Ratio R2 of the recordable innermost peripheral value R1 of the disc-shaped recording medium and the recordable outermost peripheral value R2 of the disc-shaped recording medium.
The rotational speed of the disk-shaped recording medium is controlled so that the speed is multiplied by / R1 or more, and when only the reproduction is performed, the disk-shaped recording medium is adjusted so that the linear speed is based on the reproduction position. An information recording / reproducing apparatus characterized in that the number of rotations of a recording medium is controlled. 3. The information recording / reproducing apparatus according to claim 1, wherein position detecting means for detecting the positions of the recording means and the reproducing means is provided, and the rotation control means performs recording and recording and reproducing at the same time. The position detecting means detects which of the recording means and the reproducing means is located on the inner circumference side, and rotates the disk-shaped recording medium so that the speed is based on the one on the inner circumference side. Configured to control the number,
An information recording / reproducing apparatus, wherein the number of rotations of the disk-shaped recording medium is controlled so that the linear velocity is based on the reproducing position when only reproducing is performed. 4. The information recording / reproducing apparatus according to claim 1, wherein position detecting means for detecting the positions of the recording means and the reproducing means is provided, and the rotation control means performs recording and recording and reproducing simultaneously. The position detecting means detects which of the recording means and the reproducing means is located on the outer circumference side, and the speed based on the one on the outer circumference side is used as the innermost recordable inner circumference of the disc-shaped recording medium. The number of rotations of the disk-shaped recording medium is controlled so that the speed becomes a value obtained by multiplying the ratio R2 / R1 of the value R1 and the recordable outermost peripheral value R2 of the disk-shaped recording medium, and only the reproduction is performed. In this case, the information recording / reproducing apparatus is characterized in that the rotational speed of the disk-shaped recording medium is controlled so that the linear velocity is based on the reproducing position. 5. An information recording / reproducing apparatus for recording / reproducing information having a different transfer rate for each period from / to the inner peripheral side to the outer peripheral side of a disk-shaped recording medium, and temporarily storing the inputted information. The third storage means, the first writing control means for controlling the information to be written in the third storage means according to the different transfer rate for each period, and the disc from the third storage means. Read-out control means for controlling to read out at a rate according to the disk-shaped recording medium, first accumulated-amount detecting means for detecting an accumulated amount of information in the third storage means, and the disk-shaped recording medium. Fourth storage means for storing the reproduced information, second writing control means for controlling the information to be written in the fourth storage means at a rate according to the disc-shaped recording medium, and for each period Different transfer rates Second read control means for controlling to read at a corresponding rate, second storage amount detecting means for detecting the storage amount of information in the fourth storage means, and recording for writing information on the disc-shaped recording medium. Means, a reproducing means for reading information from the disc-shaped recording medium, and a rotation control means for controlling the number of revolutions of the disc-shaped recording medium, the recording means and the reproducing means independently performing a recording operation and a reproducing operation. When the operation is controlled and the first accumulated amount detecting means detects the accumulated amount less than or equal to the predetermined amount of the third storing means, the first read controlling means stores the data from the third storing means. The reading is stopped, and at the same time, the recording means is moved to the inner peripheral side to interrupt the writing to the disk-shaped recording medium, and when the recording means returns to the position before the movement, the third storage means And read the circle The second write control means, when the second storage amount detecting means detects the storage amount which is equal to or more than a predetermined amount of the fourth storage means. Stops reading from the disk-shaped recording medium, simultaneously moves the reproducing means to the inner peripheral side, and when the reproducing means returns to the position before the movement, reading from the disk-shaped recording medium, The rotation control means is configured to restart writing to the fourth storage means, and the rotation control means stops the recording means when information is recorded on the disc-shaped recording medium by the recording means. The information recording / reproducing apparatus is characterized in that the information recorded on the disk-shaped recording medium is reproduced by the reproducing means without any change, and recording and reproduction of information having a different transfer rate for each period can be performed simultaneously. 6. The information recording / reproducing apparatus according to claim 5, wherein when the recording and the recording and the reproduction are simultaneously performed, the rotation control means always has a speed based on the recording position of the recording means. Ratio R2 of the recordable innermost peripheral value R1 of the disc-shaped recording medium and the recordable outermost peripheral value R2 of the disc-shaped recording medium.
The rotational speed of the disk-shaped recording medium is controlled so that the speed is multiplied by / R1 or more, and when only the reproduction is performed, the disk-shaped recording medium is adjusted so that the linear speed is based on the reproduction position. An information recording / reproducing apparatus characterized in that the number of rotations of a recording medium is controlled. 7. The information recording / reproducing apparatus according to claim 5, wherein position detecting means for detecting the positions of the recording means and the reproducing means is provided, and the rotation control means performs recording and recording and reproducing simultaneously. The position detecting means detects which of the recording means and the reproducing means is located on the inner circumference side, and rotates the disk-shaped recording medium so that the speed is based on the one on the inner circumference side. Configured to control the number,
An information recording / reproducing apparatus, wherein the number of rotations of the disk-shaped recording medium is controlled so that the linear velocity is based on the reproducing position when only reproducing is performed. 8. The information recording / reproducing apparatus according to claim 5, wherein position detecting means for detecting the positions of the recording means and the reproducing means is provided, and the rotation control means performs recording and recording and reproducing at the same time. The position detecting means detects which of the recording means and the reproducing means is located on the outer circumference side, and the speed based on the one on the outer circumference side is used as the innermost recordable inner circumference of the disc-shaped recording medium. The number of rotations of the disk-shaped recording medium is controlled so that the speed becomes a value obtained by multiplying the ratio R2 / R1 of the value R1 and the recordable outermost peripheral value R2 of the disk-shaped recording medium, and only the reproduction is performed. In this case, the information recording / reproducing apparatus is characterized in that the rotational speed of the disk-shaped recording medium is controlled so that the linear velocity is based on the reproducing position. 9. The information recording / reproducing apparatus according to claim 2, 4, 6 or 8, wherein a value obtained by multiplying a reference speed by a recordable innermost circumference value R1 of the disc-shaped recording medium and the disc-shaped recording medium is used. An information recording / reproducing apparatus having an integer value of R2 / R1 or more with respect to a recordable outermost peripheral value R2. 10. The method according to claim 1, 2, 3, 4, 5, 6, 7,
8. The information recording / reproducing apparatus according to 8 or 9, wherein the information recording / reproducing method for the information on the disc-shaped recording medium is a CLV method with a constant linear velocity. 11. The method according to claim 1, 2, 3, 4, 5, 6,
7. The information recording / reproducing apparatus according to 7, 8 or 9, wherein the information recording / reproducing method for the disc-shaped recording medium is a zone CAV method in which an angular velocity is constant in each area.