JP2770876B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and / or reproducing information on and from a recording medium such as an optical disk, and more particularly, to an information recording apparatus capable of responding to information recording even if the information is recorded by a different recording method. / Reproducing apparatus.

[0002]

2. Description of the Related Art Various file memories are used for computers as means for storing and retrieving a large amount of information such as image data, image data, and code data at high speed.

[0003] As this kind of file memory, an optical disk file has characteristics such as large capacity and portability, and has recently attracted attention and is expected.

On the other hand, a laptop personal computer or the like, which is one of small personal devices, is premised on being portable. Therefore, the storage device is required to have high resistance to vibrations and high portability of a medium. You.

On the other hand, an optical disk file which is a large-capacity version of a floppy disk device satisfies the demand. Due to the demand for portability, for example, the standardization work of rewritable optical disks (magneto-optical disks) is proceeding at the International Standards Organization.

In order to improve the storage capacity of an optical disk file and the data transfer rate, it is first conceivable to improve the linear recording density. Means for increasing the linear recording density include improving the recording method and miniaturizing the recording laser spot.

Conventionally, as a recording method generally used in an optical disk, information is described in a physical change state formed on a recording medium, for example, a center position of a spot-like change state such as a pit or a magnetic domain. For example, there is a so-called pit position (spot) recording method in which one of the constituent elements of the code, for example, "1" is associated.

On the other hand, as a recording method for improving the linear density recording, a component of a code for describing information is provided at a change boundary position of the physical change state, that is, at a position of a leading edge and a trailing edge of the change state. A so-called pit edge (width) recording method has been proposed in which one of them is used.

FIG. 18 shows the principle of pit position recording (spot recording) and pit edge recording (width recording), which are typical recording methods.

In FIG. 1, the code data is as follows.

"1001001001" In the pit position recording method, information is recorded at the center of the pit by providing a pit at a position where "1" exists.

On the other hand, in pit edge recording, at the position where "1" exists, the state changes from a state with or without pits to a state without or with pits. On the other hand, in pit edge recording, information is recorded at the positions of both edges of an oblong pit. As a result, higher linear recording density can be achieved in pit edge recording than in pit position recording.

By the way, in the above-mentioned optical disk device,
Heretofore, a method has been employed in which the number of revolutions of the optical disk is fixed and the recording frequency and the reproduction frequency are constant regardless of the access position. This method is called CAV (Constant Angular Velocit
y) This is called the method.

On the other hand, a new recording method has been proposed and commercialized to increase the capacity. That is, the rotation speed of the optical disc is kept constant, and the recording frequency and the reproduction frequency are switched according to the access position, thereby realizing a large capacity. This method is called MCAV (Modified Constant Ang
ular Velocity) method.

In the conventional CAV system, the recording density on the outer circumference of the optical disk is lower than that on the inner circumference, while the MCA
In the V system, generally, the recording density is almost the same at the inner circumference and the outer circumference.

[0016]

By the way, recently, in order to increase the recording capacity, a pit position recording type MCA has been used.
An information recording / reproducing apparatus employing a V method or a CAV method of a pit edge recording method is being developed.

On the other hand, as described above,
Due to the demand for portability, standardized standards for rewritable optical disks and the like have been established. From the standardization standard, the recording system is a pit position recording system, and the CAV system is mainly used.

However, in order to realize high-density and large-capacity recording, the pit edge recording method is preferable to the pit position recording method, and the MCAV method is more preferable than the CAV method. Therefore, it is considered that the MCAV method will be adopted for high-density and large-capacity recording in the pit edge recording method in the future.

Therefore, in the future, the optical disk device will be, for example, a pit position recording type CAV system,
Various systems such as the MCAV system of the pit edge recording system coexist.

However, not only the information recording / reproducing apparatus using the conventional pit position recording method but also the large-capacity information recording / reproducing apparatus which is currently being developed are not compatible with other recording methods. There is a problem that no consideration is given.

For this reason, it is considered that the information recording / reproducing apparatus using one method cannot read information recorded on the recording medium using the other method, which causes a problem in compatibility of the recording medium.

It is conceivable to provide an information recording / reproducing apparatus of each system, but it is necessary to provide extra equipment correspondingly, and this imposes a heavy burden on the user, which is not preferable. Also, in a relatively small information processing device such as a laptop computer, it is difficult to employ a recording / reproducing device of each system, contrary to the purpose of miniaturization.

Further, when the user intends to unify the recording system of the information managed by the user into one system, for example, the MCAV system by the pit edge recording system, the information is recorded by the CAV system in the pit position recording system up to that time. This will cause problems in the handling of information.

For this reason, developing an information recording / reproducing apparatus compatible with both types is a new problem in the optical disc apparatus. This is considered to be the same for a reproduction-only device and a recording-only device. Also,
It is considered that it is necessary to support the CAV method of the pit edge recording method and the MCAV method of the pit position recording method which are located between the two.

An object of the present invention is to provide a pit position recording method, a pit edge recording method, a CAV method, and an MC method.
An information reproducing apparatus, which can record information by at least two of the combinations with the AV system, and can reproduce information by any of the systems, An object of the present invention is to provide an information recording device and an information recording / reproducing device.

[0026]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a medium rotating means for rotating a recording medium, a reproducing head for detecting recording information from the recording medium, and an externally provided identification. A control circuit having a selection function of selecting between a spot recording method or a width recording method and selecting between a CAV method and an MCAV method based on information or identification information detected from a recording medium; A detection circuit for reproducing the detection signal by a method selected from the spot recording method and the width recording method, and by a method selected from the CAV method and the MCAV method; A playback device is provided.

According to the present invention, there is provided a medium rotating means for rotating a recording medium, a recording head for recording information on the recording medium, and an externally provided identification information or identification information detected from the recording medium. Based on the selection of the spot recording method or the width recording method, the CAV method or M
A control circuit having a selection function of selecting the CAV method, a recording method using a method selected from the spot recording method and the width recording method, and a method selected from the CAV method and the MCAV method. There is provided an information recording apparatus including a recording information generation circuit having a function of generating recording information to be written on a medium.

Further, the present invention provides a medium rotating means for rotating and driving a recording medium, a recording / reproducing head for recording / reproducing information on / from the recording medium, and identification information provided from outside or detected from the recording medium. Based on the identification information, select the spot recording method or width recording method,
A control circuit having a selection function of selecting the CAV method or the MCAV method; a method selected from the spot recording method and the width recording method; and a method selected from the CAV method and the MCAV method A reproducing circuit having a function of reproducing a detection signal from the reproducing head, a method selected from a spot recording method and a width recording method, and a method selected from a CAV method and an MCAV method. The present invention provides an information recording / reproducing apparatus including a recording information generation circuit having a function of generating recording information to be written on a recording medium by the method described above.

In the reproducing circuit, for example, the leading edge and the trailing edge of the signal pulse read from the recording medium are detected, and when the width recording method is selected, the leading edge and the trailing edge are used. When the spot recording method is selected, a function of reproducing data using one of the leading edge and the trailing edge is provided.

According to the present invention, the data reproduced by the reproducing circuit is temporarily stored, and the data is converted by the recording information generating circuit into recording information of a recording system different from that used during reproduction. Can be realized.

[0031]

According to the present invention, the CAV system or the MCAV system in the spot recording system and the CAV system or the MCA system in the width recording system are used.
By making it possible to reproduce at least two of the V systems, it is clear that the recording system of the recorded data is any of the CAV system or MCAV system of the spot recording system and the CAV system or MCAV system of the width recording system. In such a case, the reproduction method can be selected by instructing the apparatus to identify the recording system.

If it is unknown, the recording system is determined based on the reproduction data from a specific track provided on the recording medium, and the data is reproduced or recorded by the corresponding recording system. . As a result, the recording system can be automatically detected, and when reproducing the recording medium, the user can record / reproduce data without being aware of the difference in the recording system.

Therefore, according to the present invention, the CAV method of the pit position recording method and the MC of the pit edge recording method are used.
Even in the case where different recording methods coexist, such as the AV method, one device can cope with the problem, and device compatibility with a recording medium can be ensured.

[0034]

Embodiments of the present invention will be described below with reference to the drawings.

In each of the following embodiments, an example of an information recording / reproducing apparatus will be described. However, the information recording apparatus and the information reproducing apparatus are configured in the same manner as the respective embodiments by omitting unnecessary functions. be able to. Further, in the following embodiment, an example in which a pit position recording method and a pit edge recording method are adopted is shown. However, only the pits are used, as in the case of using a recording medium for recording information according to a physical change state other than the pits. The present invention is also applicable to spot recording or width recording that cannot be performed.

In each of the embodiments, the same or common components are denoted by the same reference numerals to avoid duplication of description.

FIG. 1 shows the configuration of an embodiment in which the information recording / reproducing device of the present invention is applied to an optical disk file device.

The information recording / reproducing apparatus according to the embodiment shown in FIG. 3 includes a spindle motor 22 functioning as a means for rotating a recording medium 26, an optical head 5 for writing and reproducing information on and from the recording medium 26, A recording information generating circuit 1a for generating information to be written by the optical head 5, a reproducing circuit 1b for reproducing information from a detection signal from the head 5, and a spindle motor 22 for rotating the recording medium 26; A drive control circuit 1e for driving, a head access control circuit 1d for performing drive control and focus control of an actuator 19 for moving the optical head 5 to a target access position, a recording information generation circuit 1a, a reproduction circuit 1b, and a head The entire device including the operation control of the access control circuit 1d and the drive control circuit 1e is controlled. Constructed and a Cormorant control circuit 1c.

The optical head 5 is appropriately selected according to the properties of the target recording medium. The optical head 5 has both functions of a recording head and a reproducing head, and includes, for example, a laser light emitting element as a light beam source, an optical system, and a driving device for the optical system. Of course, the present invention is not limited to this, and an optical head applicable to a rewritable recording medium, for example, a magneto-optical disk or the like can be used.

Here, there are two types of recording systems, for example, an MCAV system for a pit edge recording system for achieving high capacity and high speed, and a CAV system for a pit position recording system for achieving device compatibility. The main circuit for dealing with this will be described below.

The recording information generating circuit 1a selects one of the MCAV method for the pit edge recording method and the CAV method for the pit position recording method based on identification information given from outside or identification information detected from the recording medium. Then, the recording information is generated. This recording information generation circuit 1
a is a (2,7) code conversion circuit 10 for converting write data into a code string composed of (2,7) codes;
7) a write clock generation circuit 11 for supplying a write clock to the code conversion circuit 10, a write pulse generation circuit 12 for generating a write pulse from the (2, 7) code sequence, and an optical system based on the write pulse from the write pulse generation circuit 12. A laser driver 13 for driving the head 5 and a write power switching circuit 18 for switching a current applied to the laser driver 13 according to an access position are provided.

In the case of the pit edge recording system and the MCAV system, in order to switch the writing frequency and the write power according to the access position, the drive MPU (micro processing unit) 17 sends the zone information to the write clock generation circuit 11 and the write power switching circuit 18. Given to. On the other hand, in the case of the CAV method as the pit position recording method, the writing frequency is constant regardless of the access position. Further, the write power may be switched according to the access position.

The reproducing circuit 1b is adapted to perform the following operations based on identification information given from the outside or identification information detected from a recording medium.
The detection signal is reproduced by selecting either the MCAV method for the pit edge recording method or the CAV method for the pit position recording method. The reproduction circuit 1b amplifies a detection signal from the optical head 5 and extracts a signal necessary for reproducing information, a waveform shaping circuit 7 for shaping the waveform of the detected original signal, and a waveform shaping circuit 7 for shaping the waveform of the detected original signal. A phase synchronization circuit 8 for extracting a clock from a phase synchronized with the synchronized signal, and converting the waveform-shaped signal to (2,7) code by N
It comprises a (2,7) code demodulation circuit 9 for demodulating to RZ data, and an identification information detection circuit 14.

In the case of the MCAV method in the pit edge recording method, the reproduction frequency is switched according to the access position.
The zone information is supplied from the drive control MPU 17 to the phase synchronization circuit 8. On the other hand, CAV in the pit position recording method
In the case of the method, the reproduction frequency is constant regardless of the access position.

The head access control circuit 1d includes a seek control circuit 2 for moving the optical head 5 to the access position.
1 and a tracking focus control circuit 20 for performing tracking and focus control of the optical system.

The drive control circuit 1e includes a rotation speed detection circuit 23, a rotation speed control circuit 24, and a drive circuit 25 in order to rotate the recording medium 26 at a constant speed.

The number of revolutions of the spindle motor 22 may be the same or different depending on whether the pit edge recording method is the MCAV method or the pit position recording method is the CAV method. Here, in the pit position recording method, it is desirable to be 1800 rpm in conformity with the ISO standard, and in the pit edge recording method, it is desirable to be 1800 rpm or more in order to achieve a higher data transfer speed.

The control circuit 1c is provided with a SCSI (Small Computer Sys.) For exchanging data between a host computer (hereinafter abbreviated as a host) (not shown) and the apparatus.
temInterface) controller 15, a buffer memory 2 for temporarily storing data, a buffer controller 3 for controlling input and output of data to and from the buffer memory 2,
Disk controller 4 for controlling data recording / reproduction
And a controller control MPU that causes this control device to function.
16 and a drive control MPU 17 for operating the recording information generation circuit 1a, the reproduction circuit 1b, the head access control circuit 1d, and the drive control circuit 1e.

FIG. 2 shows an example of the write clock generation circuit 11 and the write power switching circuit 18 constituting the recording information generation circuit 1a.

The write clock generation circuit 11 includes a reference clock generator 11a, an N frequency divider 11b, a phase frequency comparator 11c, a charge pump 11d, a loop filter 11
e, a voltage controlled oscillator 11f, a variable M frequency divider 11g, a frequency division ratio setting circuit 11h, and a center frequency switching circuit 11i.

According to the identification information, the variable M frequency divider 11g
The frequency division ratio is set by the drive control MPU 17 via the frequency division ratio setting circuit 11h. Here, the dividing ratio setting circuit 1
1h can be composed of, for example, a three-state bus buffer and a flip-flop, and the frequency division ratio can be set according to the access position.

The center frequency switching circuit 11i switches a center frequency and a gain in order to prevent a circuit loss of a PLL including a voltage controlled oscillator, and is simply constituted by an analog switch SW11a and resistors R11a and R11b. it can. Here, the analog switch SW11
By turning on and off a, two center frequencies and a gain are obtained. In the case of the MCAV method, the center frequency is lower on the inner circumference side than on the outer circumference side.

The write power switching circuit 18 can be composed of a write power setting circuit 18a, a D / A converter 18b, and the like. The write power setting circuit 18a can be constituted by a circuit similar to the frequency division ratio setting circuit 11h.

FIG. 4 shows an embodiment of the waveform shaping circuit 7 of the reproducing circuit 1b.

The waveform shaping circuit 7 includes a differentiator 7a, an AGC
(Automatic control gain) Amplifier 7b and gate generation circuit 7c
, A differentiator 7d, a pulse generation circuit 7e, a filter setting circuit 7f, a low-pass filter LPF (1) 7g, a low-pass filter (2) 7h, and an analog switch SW7a.
To SW7e.

In order to support the MCAV system, low-pass filters LPGs 7g and 7h having different cutoff frequencies can be selected according to the access position. Here, for example, 2
Although one LPF has been described, the number of LPFs is not limited to two.

The identification information detection circuit 14 includes a low-pass filter 14a including a resistor R14 and a capacitor C14,
And a comparator 14b, performs a comparison between the output voltage and the reference voltage V ₂ of the AGC amplifier 7b, detecting identification information for identifying the pit position recording system.

FIG. 5 is a waveform diagram of a read signal in the pit position recording method. FIG. 6 shows a waveform diagram of a read signal in the pit edge recording method.

FIG. 8 shows a conventional phase locked loop circuit (not shown).
5 is an operation timing chart for explaining the operation.

When the VCO clock is input to the phase comparator at the timing shown in the figure with respect to the read pulse, the phase comparator outputs an INC signal and a DEC signal. INC
The signal goes low at the rising edge of the read pulse and goes high at the falling edge of the VCO clock. On the other hand, the DEC signal corresponds to a read pulse having a constant pulse width depending on the data transfer speed. The read pulse is generated using a delay line. A charge current and a discharge current are output according to the INC signal and the DEC signal. The magnitudes of the charge current and the discharge current are different between the phase synchronization period, that is, the normal gain period, and the phase pull-in period, that is, the high gain period.

In order to apply this phase synchronization circuit to the MCAV system, the data transfer rate changes according to the access position, so that it is necessary to set the read pulse width stepwise. That is, a large number of delay lines for setting the read pulse width are required, which is a major problem in terms of cost and mounting on a board.

FIG. 9 illustrates the internal circuit configuration of one embodiment of the phase locked loop 8 suitable for the present invention, and the operation of the phase locked loop 8 will be described with reference to FIG.

The phase synchronization circuit 8 includes a frequency phase comparator 8a
, Charge pump 8b, loop filter 8c, voltage controlled oscillator 8d, phase comparator 8e, T / I converter 8
f and a center frequency switching circuit 8g.

In this embodiment, the frequency phase comparator 8a and the phase comparator 8e are devised in order to support the MCAV system. Switching between the center frequency and the gain of the voltage controlled oscillator 8d is performed by the write clock generation circuit 11 described above.
It can be realized by the same idea as described above. Here, for example, it is configured to include an analog switch SW8 and resistors R8a and R8b. In order to optimize the PLL system,
The gain of the charge pump 8b is set according to the access position.

The phase synchronization circuit 8 sets the loop gain higher in the high gain period than in the normal gain period in order to perform high-speed pull-in. At the time of frequency phase comparison, the state becomes a high gain state, and at the time of phase comparison, the state becomes a normal gain state. When the read enable signal is in the disabled state, the VCO clock is compared with the write clock to increase the speed of following the read pulse when the state changes.

FIG. 11 shows a circuit configuration of the frequency phase comparator 8a, and FIG. 12 shows an operation timing chart of the frequency phase comparator 8a.

The frequency / phase comparator 8a includes flip-flops 17a-1 to 17a-3, a divide-by-4 circuit 8a-4,
It comprises a NAND gate 8a-5 and an AND gate 8a-6. Since the pull-in data pattern of the (2, 7) code is 1000100010..., The divide-by-4 circuit 8a-4 is used here.

The INC signal goes high at the rising edge of the read pulse and changes to low level at the rising edge of the divided-by-4 VCO clock. The DEC signal goes high at the rising edge of the divided-by-4 VCO clock and goes low at the rising of the read pulse. Therefore, in the present method, it is not necessary to set the width of the read pulse according to the access position also in the MCAV method.

FIG. 13 shows a circuit configuration of the phase comparator 8e.
FIG. 14 shows a circuit configuration of the T / I converter 8f, and FIG. 15 shows an operation timing chart of the phase comparator 8e and the T / I converter 8f.

The phase comparator 8e includes a flip-flop 8e
-1 to 8e-4 and AND gates 8e-5 to 8e-7
And inverter gates 8e-8 and 8e-9.

The output Tc of the AND gate 8e-5 is at the high level during the period from the rising edge of the read pulse to the rising edge of the VCO clock immediately after that. It becomes a high level for a half cycle from the falling edge to the rising edge of the VCO clock immediately after the output Ts of the AND gate 8e-6. The output Td of the AND gate 8e-7 is equal to the VC immediately after Ts.
It becomes a high level for a half cycle from the rising edge to the falling edge of the O clock.

The T / I converter 8f shown in FIG.
Current sources 8f-4 and 8 whose current values are set by 8
f-6, variable current sources 8f-3 and 8f-5, switches SW8a and SW8b, and an inverter 8f-1.
And a capacitor C connected in parallel to the inverter 8f-1.
8a and a switch SW forming a sample-and-hold circuit
8b and a capacitor C8b, and an operational amplifier 8f-2 for controlling the output currents of the variable current sources 8f-3 and 8f-5 according to the output of the sample and hold circuit.

The T / I converter 8f operates to convert a phase error (time) into a current value.

The [0074] Tc signal, pull the charge current I _TC from the capacitor C8a, voltage V _c1 is increased. Next, T
The s signal, the voltage of V _c1 is sampled and held in the capacitor C8b. The sample hold voltage V _c2 current I _TD in response to the generated, by pouring the discharge current I _TD in capacity C8a by Td signal returns to the initial state, the position comparison operation cycle is completed.

The charge currents _ITC and _ID are connected to the resistor R8
, And I _TD and I _C are variable currents that vary according to V _c2 . Therefore, the output current I _D
It is determined by the difference between I _c and I _d. In the case of the T / I conversion method, since only the rising edge of the read pulse is required, it is possible to easily cope with the MCAV method.

FIG. 16 shows a circuit configuration of the rotation speed detection circuit 23 and the rotation speed control circuit 24.

The rotation speed detection circuit 23 includes a rotation detector 23a such as a Hall element, and a pulsing circuit 23b. The rotation speed control circuit 24 includes an N frequency divider 24.
a, a reference clock generator 24b, and a variable M frequency divider 24
c, a speed comparator 24d, an integrator 24e, and a frequency division ratio setting circuit 24f. The frequency division ratio setting circuit 24f can be composed of, for example, a three-state buffer and a latch circuit.

By changing the frequency division ratio of the variable M frequency divider 24c, the rotation speed of the spindle motor can be set arbitrarily. Here, the frequency division ratio of the variable M frequency divider 24c is set from the drive control MPU 17 via the frequency division ratio setting circuit 24f according to the recording method.

In such a configuration, as shown in FIG. 1, write information from a host (not shown)
The data is stored in the buffer memory 2 via the I controller 15. Then, the data stored in the buffer memory 2 is read out by the buffer controller 3 and write control is performed by the disk controller 4,
(2, 7) Sent to the code modulation circuit 10. The write data is converted from NRZ data to (2,7) code data by the (2,7) code modulation circuit 10.

The (2,7) code modulation circuit 10 outputs (2,7)
7) The code data is written to the optical disk medium 26 by driving the optical head 5 by the laser driver 13 via the write pulse generation circuit 12.

On the other hand, when reproducing the information written on the optical disk medium 26, the read signal from the optical head 5 is amplified by the preamplifier 6, passed through the waveform shaping circuit 7 and the phase synchronizing circuit 8 to (2,7). ) Sent to the code demodulation circuit. And the (2,7) code read data is
The data is converted into NRZ read data by the (2,7) code demodulation circuit 9 and read control is performed by the disk controller 4. The data read by the disk controller 4 is sent to the host via the buffer memory 2 and the SCSI controller 15.

Here, the read signal from the optical head 5 is amplified by the preamplifier 6, and the differential output (6-P, 6-
N). The original reproduced signal of the signal output 6-P is as shown in FIGS.

Next, an embodiment in which data is recorded and reproduced by using the information recording / reproducing apparatus described above will be described.

First, an embodiment in which the recording method is known in advance will be described with reference to FIGS.

If the identification method is already known for the recording medium to be used, in the above-described apparatus, the identification information indicating which recording method is used is input by a keyboard, switch, or other means (not shown) in this embodiment. Input to the device. In response to the input of this information, the drive control MP
U17 outputs the discrimination control information, so that in the waveform shaping circuit 7, the switches SW7a and SW7b select the output of the differentiator 7a and input this to the AGC amplifier 7b. In the case of the pit position recording method, the switch SW7e is turned off according to the identification information. On the other hand, in the case of the pit edge recording method, the switch SW7e
Is turned on.

A case where information recorded by the pit position recording method is reproduced will be described.

The original reproduced signal 6-P (negative phase 6-N) is differentiated by the differentiator 7a, and the first-order differentiated reproduced signals 7a-P, 7a-
N is input to the AGC amplifier 7b. That is, the signal is differentiated to detect the pit position, and the signal is converted to an AGC amplifier 7.
b keeps the signal amplitude constant at V _PP . The first-order differential reproduction signals 7b-P and 7b-N are supplied to a gate generation circuit 7 in the next stage.
c, input to the differentiator 7d, and gate signals 7c-P, 7c-
N and second-order differential reproduction signals 7d-P and 7d-N.

The gate signal corresponds to the gate generation level,
It is generated according to the magnitude of the amplitude level of the first derivative reproduction signal. In the pit position recording method, the switch SW7e
Is turned off, the gate signal 7c-N is not input to the pulse generation circuit 7f.

The read pulse signal is a gate signal 7c-P
Is high level and the second derivative reproduction signal is at a zero level.

As described above with reference to FIGS. 4 and 5, the recording pits and the read pulse signal are associated with each other, and the read pulse signal is transmitted to the subsequent phase synchronization circuit 8 (FIG. 1).
Reference). The phase synchronization circuit 8 generates a clock phase-synchronized with the read pulse signal, and uses this clock to convert the data into NRZ read data in the (2,7) code demodulation circuit 9 and sends it to the disk controller 4.

On the other hand, when reproducing information recorded by the pit edge recording method, the switch SW7e is turned on, and each signal becomes as shown in FIG.

The gate signals 7c-P and 7c-N are both valid and input to the pulse generation circuit 7f. Therefore,
The read pulse signal is the gate signal 7c-P or 7c-
While N is at the high level, the second derivative reproduction signal is generated at the position where it crosses the zero level.

Next, a case where information is written to an optical disk medium will be described.

When recording is performed by the pit position recording method, the output of the (2,7) code modulation circuit 10 is (2,7).
7) The code write data is synchronized with the clock from the write clock generation circuit 11 by the timing circuit 12a. The write synchronization data is delayed for a desired constant time by the delay circuit 12e. A write pulse is obtained by ANDing the delayed write synchronization data and the write synchronization data in the constant pulse width generator 12c. This signal is applied to the laser driver 13 and information is recorded by the optical head 5.

On the other hand, when recording is performed by the pit edge recording method, write synchronization data is frequency-divided by the frequency divider 12b to generate a write pulse. When the write pulse is at a high level, the laser driver 13 is turned on to form a pit.

The output of the frequency divider 12b or the output of the constant pulse width generator 12c is selected by the switch 12d according to the identification information indicating the recording method.

Next, an embodiment in the case where the recording method of the optical disk on which information is recorded is unknown will be described.

In this embodiment, the recording method is determined from the identification information recorded on the identification-dedicated track. The device used is the same as that shown in FIGS.

First, according to the identification control information, the switch SW
7a is turned on, and the preamplifier outputs 6-P and 6-N are selected and input to the AGC amplifier 7b. On the other hand, the output of the differentiator 7a is cut off when the switch SW7b is turned off. The signal amplitude V _PP of the AGC amplifier outputs 7b-P and 7b-N, which are reproduction signals, is kept constant as shown in FIG.

A part of the output of the AGC amplifier 7b is sent to the identification information detecting circuit 14. Here, the low-pass filter consisting of resistor R14 and capacitor C14 Prefecture, the average voltage V _X is produced. This DC voltage is supplied to the comparator 14
By inputting into b, detection identification information is obtained. In addition,
The recorded code data is not limited to “10001000”, but may be any repetition of the same pattern.

In the case of the pit position recording method, in the present circuit configuration, the detection identification information has a high level, and the pit edge recording has a low level. In the former case,
V _X is higher than V _PP / 2. In the latter case, since V _X is about V _PP / 2, the comparison voltage V ₂ of the comparator is
It is set higher than V _PP / 2 and lower than V _{X of the} pit position recording method. As a result, the detection identification information is as described above, and the recording method can be easily determined.

Thereafter, in order to reproduce the information, the switches SW7a and SW7b are used in accordance with the identification control information and the identification information.
Selects the output of the differentiator 7a with the switch SW
At 7e, 7c-N, which is the output of the gate generation circuit 7c, is selected and deselected.

Next, the second embodiment of the information recording / reproducing apparatus of the present invention will be described.
An example will be described.

In this embodiment, the (2,7) code is used for the CAV method in the pit position recording method, and the (1,7) code is used for the MCAV method in the pit edge recording method.

The basic configuration of the information recording / reproducing apparatus of this embodiment is the same as that of the embodiment shown in FIG. That is, as shown in FIG. 17, the recording information generation circuit 1a, the reproduction circuit 1b, the control circuit 1c, and the drive control circuit 1e
And a head access control circuit 1d (not shown);
An optical head 5, an actuator 19 and a spindle motor 22 are provided.

The following description focuses on the differences from the embodiment shown in FIG.

The recording information generating circuit 1a includes a circuit for generating recording information using the (1,7) code, a circuit generating recording information using the (2,7) code, a write clock generating circuit 11, a laser driver 13, , A write power switching circuit 18.

The circuit for generating the recording information based on the (1,7) code includes a switch 31 for selecting whether or not to input the recording data from the disk controller 4 described later, and the recording data into the (1,7) code string. A (1,7) code modulation circuit 101 for conversion, a write pulse generation circuit 121 for generating a write pulse from the (1,7) code string, and a switch for selecting whether or not to output the write pulse to the laser driver 13 33.

The circuit for generating the recording information based on the (2,7) code includes a switch 32 for selecting whether to input the recording data from the disk controller 4 described later, and the recording data into the (2,7) code string. (2,7) code modulation circuit 102 for conversion, write pulse generation circuit 122 for generating a write pulse from (2,7) code string, and switch for selecting whether or not to output this write pulse to laser driver 13 34.

The reproducing circuit 1b includes a preamplifier 6 for amplifying a signal from the optical head 5, a circuit for reproducing a detection signal based on the (1,7) code, and a circuit for reproducing a detection signal based on the (2,7) code. It has.

The circuit for reproducing the detection signal based on the (1,7) code includes a switch 35, a waveform shaping circuit 71, a phase synchronization circuit 81, a (1,7) code demodulation circuit 91, and a switch 3
7.

The circuit for reproducing the detection signal based on the (2,7) code includes the switch 36, the waveform shaping circuit 72, the phase synchronization circuit 82, the (2,7) code demodulation circuit 92, and the switch 3
Eight.

The above switches 31, 33, 35 and 37
The switches 32, 34, 36, and 38 are selectively controlled by the drive control MPU 17 based on external identification information (or identification information detected from a recording medium), as in the embodiment shown in FIG. Is turned on and off.

Similarly, the write clock generation circuit 11 and the write pulse switching circuit 18 are controlled by the drive control MPU 17 to operate according to the system indicated by the identification information.

The waveform shaping circuit 71 and the phase synchronizing circuit 81 are configured to operate as an MCAV system using a pit edge recording system. On the other hand, the waveform shaping circuit 72
The phase synchronization circuit 82 is configured to operate as a CAV system in a pit position recording system.

The drive control MPU 17 sends out the signal A and the signal B to each circuit in accordance with the identification information in order to select a circuit corresponding to the CAV method in the pit position recording method or a circuit corresponding to the MCAV method in the pit edge recording method. . Here, the (2, 7) modulation / demodulation circuit is selected in the former method, and the (1, 7) modulation / demodulation circuit is selected in the latter method.

FIG. 19 shows the relationship between the recording frequency and the reproduction frequency with respect to the recording and reproduction range for each recording system, and FIG. 20 shows the relationship between the rotation speed and the recording and reproduction range for each recording system.

The pit edge recording method can record about 1.5 times higher density than the pit position recording method. The data transfer speed increases as the recording density increases, and increases as the rotation speed increases. In order to increase the capacity and speed, the MCAV method is indispensable for the pit edge recording method. The recording and reproduction frequency of the CAV method in the pit position recording method of the ISO standard and the MC in the pit edge recording method
In order to make the AV system the same in the inner circumference, it is sufficient to increase the number of revolutions by an amount (about 1.5 times) that allows high-density recording, which is very advantageous in terms of speeding up. Further, in order to realize a large capacity and a high speed, it is only necessary to increase the recording / reproducing frequency and the rotational speed.

In each of the above embodiments, the CAV method is used for the pit position recording method, and the M is used for the pit edge recording method.
Although an example has been described in which compatibility with the case of the CAV method is provided, the present invention is not limited to this.

For example, including the case of the above-described embodiment, at least two, and preferably all of the following (a) to (d) can be reproduced and / or recorded.

(A) Pit position recording method CAV method (b) Pit edge recording method MCAV method (c) Pit position recording method MCAV method (d) Pit edge recording method CAV method The schemes other than those shown in the examples can be realized using each component of the above-described embodiment by slightly changing the circuit configuration, setting parameters, and the like.

In the above embodiments, the pit position recording method and the pit edge recording method have been described. However, the present invention is not limited to the case where the physical form of recording on a recording medium is a pit. That is, regardless of the physical form of the recording medium, the present invention can be widely applied to recording data at spot positions, recording data at the width between edges, and the like.

The fact that the above-described embodiment operates as a pit position recording type information recording / reproducing apparatus or a pit edge recording type information recording / reproducing apparatus will be described.
Either a method already developed or a method developed in the future may be used.

In each of the embodiments described above, examples of the information recording / reproducing apparatus have been described, but these may not be independent apparatuses.
For example, it may be connected to or built into an information processing device and used as an auxiliary storage device.

Next, an embodiment of a recording type converter will be described as an application example of the present invention.

This is the same as the embodiment shown in FIG.
The present invention can be applied to any device of the embodiment shown in FIG. However, a rewritable recording medium is used.

First, recorded information is reproduced from the recording medium by the reproducing circuit 1b and stored in the buffer memory 2. Then, the information stored in the buffer memory 2 is written to the original recording medium by a recording method different from that used during reproduction.

As a result, a recording type converter can be configured.

[0129] In view of the capacity of the buffer memory 2, it is preferable to alternately perform reproduction and recording for each track.

The above embodiment is an example using one information recording / reproducing device, but a plurality of devices may be used.

In this case, one may be dedicated to reproduction and the other may be dedicated to recording. In this case, the original recording medium may not be rewritable.

In each of the above embodiments, an optical recording medium is taken as an example. However, the present invention is not limited to this, and can be applied to a recording medium that can employ both a spot recording method and a width recording method. .

[0133]

As described above, according to the present invention, the spot recording method is a CAV method or an MCAV method.
Information can be recorded by any of the combinations of at least two of the CAV method and the MCAV method, which are width recording methods, and the information can be reproduced by any recording method.

Therefore, according to the present invention, information recorded by different recording methods can be reproduced by one device, compatibility of the device with a wide range of recording media can be ensured, and features of an optical disk file device and the like can be ensured. Can be maximized. In addition, since information can be recorded by selecting a different recording method, compatibility of a recording medium such as an optical disk can be achieved, and user convenience can be improved.

The data transfer rate can be increased by increasing the rotation speed of the recording medium.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing details of some of the components in the first embodiment.

FIG. 3 is a block diagram showing details of some of the components in the first embodiment.

FIG. 4 is a block diagram showing details of some of the components in the first embodiment.

FIG. 5 is a waveform chart showing a waveform of a read signal in a pit position recording method.

FIG. 6 is a waveform chart showing a waveform of a read signal in a pit edge recording method.

FIG. 7 is a waveform chart showing an operation of discriminating between a pit position recording method and a pit edge recording method.

FIG. 8 is a timing chart showing the operation of a conventional phase locked loop circuit.

FIG. 9 is a block diagram showing details of some of the components in the first embodiment.

FIG. 10 is an operation timing chart of each circuit in the first embodiment.

FIG. 11 is a block diagram showing details of some of components in the first embodiment.

FIG. 12 is an operation timing chart of each circuit in the first embodiment.

FIG. 13 is a block diagram showing details of some of the components in the first embodiment.

FIG. 14 is a block diagram showing details of some of the components in the first embodiment.

FIG. 15 is an operation timing chart of each circuit in the first embodiment.

FIG. 16 is a block diagram showing details of some of the components in the first embodiment.

FIG. 17 is a block diagram showing the configuration of a second embodiment of the information recording / reproducing apparatus of the present invention.

FIG. 18 is a waveform chart showing the principle of a pit position recording method and a pit edge recording method.

FIG. 19 is a graph showing the relationship between the recording, reproduction frequency, rotation speed, and access position for explaining the effect of the embodiment.

FIG. 20 is a graph illustrating a relationship between an access position and a recording / reproducing frequency and a rotation speed for explaining an effect of the embodiment.

[Explanation of symbols]

1a: recording information generation circuit, 1b: reproduction circuit, 1c: control circuit, 1d: head access control circuit, 1e: drive control circuit, 5: optical head, 6: preamplifier, 7: waveform shaping circuit, 8: phase synchronization circuit , 9 ... (2,7) code demodulation circuit, 10 ... (2,7) code modulation circuit, 11 ... write clock generation circuit, 12 ... write pulse generation circuit, 13 ... laser driver, 14 ... identification information detection circuit, 15 … SCS
I controller, 16 ... Controller control MPU, 17
... Drive control MPU, 18 ... Write power switching circuit.

──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Shinichi Arai 2880 Kozu, Odawara City, Kanagawa Prefecture Inside the Odawara Plant, Hitachi, Ltd. In-house (72) Inventor Shunji Nagata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Video Engineering Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 19/00 G11B 7/00

Claims (4)

(57) [Claims] 1. A medium rotating means for driving a recording medium to rotate, a reproducing head for detecting recorded information from the recording medium, and a device for reproducing recorded information from a detection signal of the reproducing head.
A recording circuit to be reproduced by the reproducing circuit based on the reproducing circuit having the function and the identification information given from the outside or the identification information detected from the recording medium.
A control circuit having a selection function of selecting a method, wherein the reproduction circuit is adapted to the method selected by the control circuit.
Therefore, the detection signal from the reproduction head is recorded information.
Information reproducing apparatus characterized by reproducing the broadcast. 2. A medium rotating means for driving a recording medium to rotate , a recording head for recording information on the recording medium, and a recording to be recorded on the recording medium by the recording head.
A recording information generation circuit having a function of generating information; and a recording information generation circuit configured to record information based on identification information given from outside or identification information detected from a recording medium.
A control circuit having a selection function of selecting a recording method to be used for generating a report, wherein the recording information generation circuit is selected by the control circuit.
Recording information to be written to the recording medium according to the method
An information recording device, which generates the information. 3. A medium rotating means for rotating the recording medium, a recording / reproducing heads <br/> de recording / reproducing information on a recording medium, the reproduction of the recorded information from the detection signal of the reproducing head Machine to do
And a recording to be recorded on the recording medium by the recording head.
A recording information generating circuit having a function of generating information; and a recording to be reproduced by the reproducing circuit based on identification information given from outside or identification information detected from a recording medium.
A control circuit having a selection function of selecting a system, and a recording function to be used for the recording information generation circuit to generate the recording information , and the reproduction circuit is configured to perform the operation based on the system selected by the control circuit.
Therefore, the detection signal from the reproduction head is recorded information.
And the recorded information generating circuit is selected by the control circuit.
Recording information to be written to the recording medium according to the method
An information recording / reproducing apparatus for generating an information. 4. Temporarily storing data reproduced by a reproduction circuit
Then, this data is sent to the recording information generation circuit.
To convert to recording information of a recording system different from that used during playback.
The information recording / reproducing apparatus according to claim 3, wherein the information recording / reproducing apparatus has a function.