JP2612632B2 - Information recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and / or reproducing information on a recording medium such as an optical disk, and more particularly, to recording information by a different recording method. The present invention relates to an information recording / reproducing apparatus which can handle the information.

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

As a file memory of this type, an optical disk file has features 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, so that its storage device is required to be highly resistant to vibration and to be highly portable.

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.

By the way, in order to improve the storage capacity of an optical disk file and the data transfer speed, 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 disc, a physical change state formed on a recording medium,
For example, there is a so-called pit position (spot) recording method in which one of the components of a code that describes information at the center position of a spot-like change state such as a pit or a magnetic domain corresponds to, for example, “1”.

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

FIG. 14 shows the principle of pit position recording (spot recording) and pit edge recording (width recording), which are typical recording methods.

In the figure, 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 pit presence (or absence) to pit absence (or presence), and in pit position recording, information is recorded at the center of the pit. On the other hand, in pit edge recording, information is recorded at both edge positions 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, the above-mentioned optical disk apparatus has adopted a method in which the rotation speed of the optical disk is constant and the recording frequency and the reproduction frequency are constant regardless of the access position. This method is called CAV (Constant Angular Velocity) method.

On the other hand, a new recording method has been proposed and practically used to increase the capacity. That is, the rotation speed of the optical disc is kept constant, and the recording frequency,
The reproduction frequency is switched to realize a large capacity.
This method is called MCAV (Modified Constant Angular Velocit).
y) Called the method.

In the conventional CAV system, the recording density on the outer periphery of the optical disk is lower than that on the inner periphery, whereas in the MCAV system, the recording density is generally almost the same on the inner periphery and the outer periphery.

[Problems to be Solved by the Invention] By the way, recently, in order to increase the recording capacity, the pit position recording method MCAV method and the pit edge recording method CA
An information recording / reproducing device adopting the V system is being developed.

On the other hand, as described above, the standardization of rewritable optical disks and the like has been established due to the demand for portability of recording media. From the standardization standard, the recording system is a pit position recording system, and the CAV system is the mainstream.

However, in order to realize high-density and large-capacity recording, a pit edge recording method is preferable to a pit position recording method, and a MCAV method is more preferable than a 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, for optical disk devices, for example,
Various systems such as the pit position recording system CAV system and the pit edge recording system MCAV 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, do not consider the compatibility with other recording methods. There is a problem that is not.

For this reason, the information recording / reproducing apparatus using one method cannot read information recorded on the recording medium using the other method, which may cause a problem in compatibility of the recording medium.

Although it is conceivable to provide an information recording / reproducing apparatus of each system, 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 method of the information managed by the user to one of the methods, for example, the MCAV method by the pit edge recording method, the information recorded by the CAV method in the previous pit position recording method is used. This will cause problems in handling.

For this reason, compatible information recording /
Developing a playback device is a new challenge for optical disc devices. This is considered to be the same for a reproduction-only device and a recording-only device. It is also considered that it is necessary to support the pit edge recording method CAV method and the pit position recording method MCAV method which are located between the two.

An object of the present invention is to record information by at least two of the pit position recording method, the pit edge recording method, the CAV method, and the MCAV method. Information reproducing apparatus, information recording apparatus, and information recording / reproducing apparatus capable of reproducing information even when recording by the method of
A playback device is provided.

Means for Solving the Problems 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 identification provided from outside. Based on the information or the identification information detected from the recording medium, select the spot recording method or width recording method, and
A control circuit having a selection function of selecting the system from the MCAV system, and a detection signal from the reproduction head, a system selected from the spot recording system and the width recording system, and a CAV system and an MCAV system. And a reproducing circuit having a function of performing reproduction by a method selected from the above.

The present invention also provides a medium rotating means for rotating a recording medium, a recording head for recording information on the recording medium, and a spot based on identification information given from the outside or identification information detected from the recording medium. A control circuit having a selection function of selecting a recording method or a width recording method, and selecting a CAV method or an MCAV method, and a method selected from a spot recording method and a width recording method, and 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 recording medium by a method selected from the CAV method and the MCAV method.

Further, the present invention provides a medium rotating means for driving a recording medium to rotate, a recording / reproducing head for recording / reproducing information on / from the recording medium, identification information given from outside or identification information detected from the recording medium. Select the spot recording method or width recording method based on the
A control circuit having a selection function of selecting the V method,
A reproduction provided with a function of reproducing the detection symbols from the reproduction head 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. Circuit and a function of generating recording information to be written to a recording medium 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. An information recording / reproducing apparatus provided with a recording information generation circuit provided.

The reproducing circuit detects, for example, a leading edge and a trailing edge of a signal pulse read from a recording medium, and uses a leading edge and a trailing edge when a width recording method is selected, and uses a spot recording method. Is selected, a function is provided for reproducing data using either the leading edge or the trailing edge.

Further, according to the present invention, there is provided a function of temporarily storing data reproduced by the reproducing circuit, and then converting the data into recording information of a recording method different from that used during reproduction by the recording information generating circuit. An information recording / reproducing device can also be realized.

[Operation] The present invention provides that the spot recording system can reproduce at least two of the CAV system or MCAV system and the width recording system of at least two of the CAV system or MCAV system. Spot recording CAV
Method or MCAV method and CAV method or MCAV of width recording method
When any one of the methods is clear, the reproducing method can be selected by instructing the device to identify the recording method.

If 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 according to 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, even when different recording methods coexist, such as the CAV method of the pit position recording method and the MCAV method of the pit edge recording method, it is possible to cope with one apparatus, and Device compatibility can be ensured.

Example An example 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 can be configured in the same manner as the respective embodiments by omitting unnecessary functions. . 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 apparatus of the present invention is applied to an optical disk file device.

The information recording / reproducing apparatus of the embodiment shown in FIG.
Spindle motor that functions as a means to rotate 26
22, an optical head 5 for writing and reproducing information on and from a recording medium 26, a recording information generating circuit 1a for generating information to be written by the optical head 5, and reproducing information from a detection signal from the head 5. Playback circuit
1b and a spindle motor for rotating the recording medium 26
A drive control circuit 1e for driving the optical head 22, a head access control circuit 1d for driving the actuator 19 for moving the optical head 5 to a target access position, focus control, and the like; a recording information generation circuit 1a and a reproduction circuit 1b for these; ,
And a control circuit 1c for controlling the entire apparatus including operation control of the head access control circuit 1d and the drive control circuit 1e.

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 invention is not limited to this,
An optical head applicable to a rewritable recording medium, for example, a magneto-optical disk or the like can be used.

Here, two types of recording methods, for example, a pit edge recording method for achieving a large capacity and a high speed, are used for MCAV.
A main circuit for supporting the CAV system in the pit position recording system for achieving the device compatibility with the system will be described below.

The recording information generation circuit 1a selects either the MCAV method for the pit edge recording method or the CAV method for the pit position recording method based on the identification information given from the outside or the identification information detected from the recording medium, and records the recording information. Is generated. The recording information generation circuit 1a converts a write data into a code string composed of (2,7) codes, and supplies a (2,7) code conversion circuit 10 and a write clock to the (2,7) code conversion circuit 10. Write clock generation circuit 11 for generating a write pulse from a (2,7) code sequence
12, a laser driver 13 for driving the optical head 5 by a write pulse from the write pulse generation circuit 12, and a write power switching circuit 18 for switching a current applied to the laser driver 13 according to an access position. Is done.

In the case of the pit edge recording system and the MCAV system, zone information is supplied from a drive MPU (micro processing unit) 17 to a write clock generation circuit 11 and a write power switching circuit 18 in order to switch a writing frequency and a write power according to an access position. . On the other hand, when the pit position recording method is the CAV 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 performs the pit edge recording method in the MCAV method and the pit position recording method based on the identification information given from the outside or the identification information detected from the recording medium.
The CAV method is selected to reproduce the detection signal. The reproducing 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. And a phase synchronization circuit 8 for extracting a clock from a phase synchronized with the obtained signal, and demodulating the waveform-shaped signal from the (2,7) code to NRZ data (2,7).
7) It comprises a code demodulation circuit 9 and an identification information detection circuit 14.

In the case of the pit edge recording method and the MCAV method, the drive control MP is used to switch the reproduction frequency according to the access position.
The zone information is provided from U17 to the phase synchronization circuit 8. on the other hand,
In the case of the CAV method as the pit position recording method, the reproduction frequency is constant regardless of the access position.

The head access control circuit 1d includes a seek control circuit 21 for moving the optical head 5 to an access position 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 number detection circuit 23, a rotation number control circuit 24, and a drive circuit 25 in order to rotate the recording medium 26 at a constant speed.

The number of rotations of the spindle motor 22 is determined by the pit edge recording method of the MCAV method and the pit position recording method by the CAV method.
The method may be the same or different.
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 a SCSI (Small Computer System Interface) that exchanges data between a host computer (hereinafter abbreviated as a host) (not shown) and the device.
e) a controller 15, a buffer memory 2 for temporarily storing data, a buffer controller 3 for controlling input / output of data to / from the buffer memory 2, a disk controller 4 for controlling recording / reproduction of data, and this control device. The controller control MPU 16 to function, the recording information generation circuit 1a, the reproduction circuit 1b, the head access control circuit 1d,
A drive control MPU 17 for causing the drive control circuit 1e to function.

FIG. 2A 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 11
a, N divider 11b, phase frequency comparator 11c, charge pump 11d, loop filter 11e, voltage controlled oscillator 11f, variable M divider 11g, division ratio setting circuit 11h, center frequency switching circuit
11i.

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

The center frequency switching circuit 11i switches the center frequency and the gain in order to prevent a circuit loss of the PLL including the voltage controlled oscillator, and the analog switch SW11
a, It can be easily configured by the resistors R11a and R11b. Here, two center frequencies and a gain are obtained by turning on and off the analog switch SW11a. 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 includes a write power setting circuit 18
a, 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. 3A 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, a gate generation circuit 7c, a differentiator 7d, a pulse generation circuit 7e, a filter setting circuit 7f, and a low-pass filter LPF (1 ) 7g and low-pass filter (2) 7h,
It comprises analog switches SW7a to SW7e.

In order to support the MCAV method, low-pass filters LPF7g and 7h having different cutoff frequencies can be selected according to the access position. Here, for example, two LPFs have been described, but the number of LPFs is not limited to two.

Identification information detection circuit 14 includes a low-pass filter 14a composed of a resistor R14 and a capacitor C14 Prefecture, and a comparator 14b, performs a comparison between the output voltage and the reference voltage V _Z of the AGC amplifier 7b, the pit position recording system Is detected.

FIG. 3B is a waveform diagram of a read signal in the pit position recording method. FIG. 3C shows a waveform diagram of a read signal in the pit edge recording method.

FIG. 4 is an operation timing chart for explaining a conventional phase locked loop circuit (not shown).

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. The INC 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, DEC
The 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 method, 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. 5 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 locked loop 8 includes a frequency phase comparator 8a, a charge pump 8b, a loop filter 8c, a voltage controlled oscillator 8d,
Phase comparator 8e, T / I converter 8f, center frequency switching circuit 8
g.

In the present embodiment, a frequency phase comparator 8a and a phase comparator 8e are devised in order to support the MCAV method. Further, switching of the center frequency and the gain of the voltage controlled oscillator 8d can be realized by the same concept as the write clock generation circuit 11 described above. Here, for example, it is configured to include an analog switch SW8 and resistors R8a and R8b. Further, 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. 7 shows a circuit configuration of the frequency phase comparator 8a, and FIG. 8 shows an operation timing chart of the frequency phase comparator 8a.

The frequency / phase comparator 8a includes flip-flops 17a-1 to 17a-1.
7a-3, a divide-by-4 circuit 8a-4, a NAND gate 8a-5,
And an AND gate 8a-6. Since the (2,7) sign-in data pattern 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 divide-by-4 VCO clock. The DEC signal changes to high level at the rising edge of the divided-by-4 VCO clock and changes to low level 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. 9 shows the circuit configuration of the phase comparator 8e, and FIG. 10 shows the T / I
FIG. 11 shows an operation timing chart of the phase comparator 8e and the T / I converter 8f.

The phase comparator 8e includes flip-flops 8e-1 to 8e-4.
AND gates 8e-5 to 8e-7 and an inverter gate 8e
-8, 8e-9.

The output T _C of the AND gate 8e-5 is a period high level from rising edge of the read pulse to the rising edge of the immediately following VCO clock. The half period high level to a rising edge from the output T _S falling edge of the VCO clock immediately following the AND gate 8e-6. Output T _d of AND gate 8e-7
Consists rising edge of the VCO clock just after T _S and a half period high level until the falling edge.

The T / I converter 8f shown in FIG. 10 includes current sources 8f-4 and 8f-6 whose current values are set by a resistor R8, and a variable current source
8f-3 and 8f-5, switches SW8a and SW8b, an inverter 8f-1, a capacitor C8a connected in parallel to the inverter 8f-1, a switch SW8b and a capacitor C8b forming a sample and hold circuit, An operational amplifier 8f-2 for controlling the output current of the variable current sources 8f-3 and 8f-5 according to the output of the sample and hold circuit is provided.

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

The T _C signal, pull the charge current I _TC from the capacitor C8a, voltage V _C1 is increased. Next, the T _S signal, voltage 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 T _d signal returns to the initial state, the position comparison operation cycle is completed.

Charge current I _TC and I _D are constant current set by the resistor R8, I _TD and I _C are variable current that varies in accordance with V _c2. Therefore, the output current I _D 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. 12 shows a rotation speed detection circuit 23 and a rotation speed control circuit 24.
1 shows a circuit configuration.

The rotation number detection circuit 23 is a rotation detector 23 such as a Hall element.
a and a pulsing circuit 23b. The rotation speed control circuit 24 includes an N frequency divider 24a, a reference clock generator 24b, a variable M frequency divider 24c, a speed comparator 24d, an integrator 24e, and a frequency division ratio setting circuit 24f. It is configured with. 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) is stored in the buffer memory 2 via the SCSI controller 15. And
The data stored in the buffer memory 2 is read by the buffer controller 3 and is read by the disk controller 4.
The write control is performed by the (2,7) code modulation circuit 1
Sent to 0. Write data is a (2,7) code modulation circuit
According to 10, the NRZ data is converted into (2,7) code data.

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

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 synchronization circuit 8, and demodulated (2,7) code. Sent to the circuit. The (2,7) code read 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 is output as a differential output (6-P, 6-N).
The original reproduced signal of the signal output 6-P is as shown in FIGS. 3B and 3C.

Next, an embodiment in the case of recording and reproducing data using the above-described information recording / reproducing apparatus will be described.

First, an embodiment in which the recording method is known in advance will be described with reference to FIGS. 1 to 3C.

If the identification method is already known for the recording medium to be used, in the above-described apparatus, identification information indicating which recording method is input to the apparatus of the present embodiment by a keyboard, switch, or other means (not shown). I do. In response to the input of this information, the drive control MPU 17 outputs the identification control information, so that 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 a differentiator 7a, and the first-order differentiated reproduced signals 7a-P, 7a-N are converted to an AGC amplifier 7b.
To enter. That differentiates to detect the pit position is held constant signal amplitude V _pp that signal by the AGC amplifier 7b. The first-order differential reproduction signals 7b-P and 7b-N are input to the next-stage gate generation circuit 7c and differentiator 7d, and the gate signal 7c
-P, 7c-N and second-order differential reproduction signals 7d-P, 7d-N are generated.

The gate signal is generated based on the magnitude of the amplitude level of the first-order differential reproduction signal with respect to the gate generation level. In the pit position recording method, since 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 obtained when the gate signal 7c-P is at the high level and the second-order differential is performed. Generated only when the reproduction signal is at zero level.

As described above with reference to FIGS. 3A and 3B, the recording pit and the read pulse signal are associated with each other, and the read pulse signal is connected to the phase synchronization circuit 8 (see FIG. 1) at the subsequent stage.
Sent to 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 by 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. 3C.

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

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

When recording with the pit position recording method, (2,7)
The (2,7) code write data output from the code modulation circuit 10 is sent to the write clock generation circuit 11 by the timing circuit 12a.
Synchronized by the clock from. The write synchronization data is delayed by 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 the optical head 5 records information.

On the other hand, when recording is performed by the pit edge recording method, the 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 switch 12d selects the output of the frequency divider 12b or the output of the constant pulse width generator 12c 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. 1 and 2A.

First, according to the identification control information, the switch SW7a is turned on,
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, and the AGC amplifier output 7b-
P, the signal amplitude V _pp of 7b-N, as shown in FIG. 3D, is kept constant.

Part of the output of the AGC amplifier 7b is sent to the identification information detection circuit 14. Here, the low-pass filter consisting of resistor R14 and capacitor C14 Prefecture, the average voltage V _x is produced.
By inputting this DC voltage to the comparator 14b, detection identification information is obtained. Note that 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 V _pp / 2
taller than. In the latter case, since the V _x is about V _pp / 2, the comparison voltage V _z of the comparator is higher than V _pp / 2, and is set lower than V _x of the pit position recording system .
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 select the output of the differentiator 7a in accordance with the identification control information and the identification information, and at the same time, select and unselect the output 7c-N of the gate generation circuit 7c by the switch SW7e. Make a selection.

Next, a description will be given of a second embodiment of the information recording / reproducing apparatus according to the present invention.

In this embodiment, the (2,7) code is used for the CAV method in the pit position recording method, and the M is used in the pit edge recording method.
The CAV method is an example using a (1,7) code.

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. 13, a recording information generation circuit 1a, a reproduction circuit 1b, a control circuit 1c, a drive control circuit 1e, a head access control circuit 1d (not shown), an optical head 5, an actuator 19 and a spindle motor 22. And

In the following, description will be made focusing on differences from the embodiment shown in FIG.

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

The circuit for generating the recording information by 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,
7) a (1,7) code modulation circuit 101 for converting to a code string;
7) It has a write pulse generation circuit 121 for generating a write pulse from a code string, and a switch 33 for selecting whether or not to output this write pulse to the laser driver 13.

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,
7) a (2,7) code modulation circuit 102 for converting to a code sequence;
7) It has a write pulse generation circuit 122 for generating a write pulse from a code string, and a switch 34 for selecting whether or not to output this write pulse to the laser driver 13.

The reproduction circuit 1b includes a preamplifier 6 for amplifying a signal from the optical head 5, a circuit for reproducing a detection signal with a (1,7) code, and a circuit for reproducing a detection signal with a (2,7) code. I have.

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 37.

The circuit that reproduces the detection signal based on the (2,7) code includes a switch 36, a waveform shaping circuit 72, a phase synchronization circuit 82, a (2,7) code demodulation circuit 92, and a switch 38.

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

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 method indicated by the identification information.

Further, the waveform shaping circuit 71 and the phase synchronizing circuit 81 are configured to operate as the MCAV system in the pit edge recording system. On the other hand, the waveform shaping circuit 72 and 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 signals A and 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 used in the former method, and (1,7) is used in the latter method.
7) The modulation / demodulation circuit is selected.

FIG. 15 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. 16 shows the relationship between the rotation speed and the recording and reproduction range for each recording system.

In the pit edge recording method, high-density recording can be performed about 1.5 times as compared with 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. To make the recording and playback frequency of the CAV method in the pit position recording method of the ISO standard and the MCAV method of the pit edge recording method the same on the inner circumference, the number of rotations must be as much as the high-density recording (about 1.5 times). It is only necessary to increase the height, 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 pit position recording method CAV
Although an example has been described in which compatibility is provided between the case of the pit edge recording method and the case of the MCAV method, the present invention is not limited to this.

For example, including the case of the above embodiment, the following (a) to
Among (d), at least two, and preferably all, 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 Among these various methods, shown in the above embodiment. The other schemes can be realized by using the components 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 recording medium having a pit as a physical form of recording. 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.

Regarding that the above-described embodiment operates as an information recording / reproducing apparatus of the pit position recording method or an information recording / reproducing apparatus of the pit edge recording method, it is possible to use any of the method already developed or the method developed in the future. May be used.

In the above embodiments, 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 can be applied by using any of the apparatuses of the embodiment shown in FIG. 1 and the embodiment shown in FIG. However, a rewritable recording medium is used.

First, the reproduction information is reproduced from the recording medium by the reproduction circuit 1b and stored in the buffer memory 2. And
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.

Note that, from the relationship of the capacity of the buffer memory 2, it is preferable to alternately perform reproduction and recording for each track.

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

In this case, one may be read-only and the other may be record-only. 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, but the present invention is not limited to this, and is applicable to a recording medium that can employ both a spot recording method and a width recording method.

[Effects of the Invention] As described above, the present invention is directed to a CAV system or MCAV system which is a spot recording system, and a CAV system or a MCAV system which is a width recording system.
Information can be recorded by any of at least two of the AV system and the MCAV system, and the information can be reproduced by recording in either system.

Therefore, according to the present invention, information recorded by different recording methods can be reproduced by a single device, compatibility of the device with a wide range of recording media can be ensured, and the features of an optical disk file device and the like can be maximized. Can be used. 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 speed 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. 2A, FIG. 2B, FIG.
FIG. 7, FIG. 9, FIG. 9, FIG. 10 and FIG. 12 are block diagrams showing details of some of the components in the above embodiment, and FIG. 3B shows the waveform of a read signal in the pit position recording method. FIG. 3C is a waveform diagram showing the waveform of a read signal in the pit edge recording system, FIG. 3D is a waveform diagram showing the discriminating operation between the pit position recording system and the pit edge recording system, and FIG. 4 is a conventional phase diagram. FIGS. 6, 8, and 11 are timing charts showing the operation of the synchronous circuit, FIG. 13 is an operation timing chart of each circuit in the above embodiment, and FIG. 13 is a second block diagram of the information recording / reproducing apparatus of the present invention.
FIG. 14 is a block diagram showing the configuration of the embodiment, FIG. 14 is a waveform diagram showing the principle of the pit position recording system and the pit edge recording system, and FIG. 15 and FIG. 16 are recording and reproduction for explaining the effects of the embodiment. 6 is a graph showing a relationship between a frequency, a rotation speed, and an access position. 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 ... SC
SI controller, 16 …… Controller control MPU, 17 ……
Drive control MPU, 18 Write power switching circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichi Arai 2880 Kozu, Kozuhara, Odawara City, Kanagawa Prefecture Inside the Odawara Plant of Hitachi, Ltd. In-house (72) Inventor Shunji Nagata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Engineering Co., Ltd. (56) References JP-A-3-295068 (JP, A)

Claims (5)

(57) [Claims] 1. A medium rotating means for driving a recording medium to rotate, a reproducing head for detecting recording information from the recording medium, one of a spot recording method and a width recording method, and a CAV method and an MCAV method. Among the recording methods that are combined with either one of the methods, the width recording method and MCAV
A reproduction circuit having a function capable of reproducing the recording information recorded by one or more other recording methods in accordance with the recording method, which is a combination of the recording method and the recording method; A control circuit having a selection function of selecting a recording method to be reproduced by the reproduction circuit based on the identification information detected or the identification information detected from the recording medium, wherein the reproduction circuit has a detection signal from the reproduction head. An information reproducing apparatus, which reproduces the data according to a method selected by the control circuit. 2. A medium rotating means for driving a recording medium to rotate, a recording head for recording information on the recording medium, and a method for generating recording information to be written on the recording medium by using a spot recording method or a width recording method. One method and CAV
Of the combination of the width and MCAV methods, and one or more other types of recording methods. A recording information generation circuit having a function of performing the recording information generation, and a selection of selecting a recording method to be used by the recording information generation circuit to generate the recording information based on identification information given from outside or identification information detected from a recording medium. An information recording device, comprising: a control circuit having a function; wherein the recording information generation circuit generates recording information to be written to the recording medium in accordance with a method selected by the control circuit. 3. A medium rotating means for driving a recording medium to rotate, a recording / reproducing head for recording / reproducing information on / from the recording medium, one of a spot recording method and a width recording method, and a CAV method And MCAV method, the width recording method and MCAV method
A reproduction circuit having a function of performing reproduction in accordance with a recording method according to a recording method composed of a combination of the recording method and one or more other recording methods, and writing to a recording medium. The recording information to be generated is determined by either the spot recording method or the width recording method,
Of the combination of the width and the MCAV, and one or more other types of recording. A recording information generating circuit having a function of performing the recording, and a recording method to be reproduced by the reproducing circuit and a recording information generating circuit for generating the recording information based on identification information given from the outside or identification information detected from a recording medium. A control circuit having a selection function of selecting a recording method to be used, wherein the reproduction circuit reproduces a detection signal from the reproduction head in accordance with the method selected by the control circuit, An information recording / writing unit that generates recording information to be written on the recording medium in accordance with a method selected by the control circuit; Raw devices. 4. A reproducing circuit for detecting a leading edge and a trailing edge of a signal pulse read from a recording medium, and using a leading edge and a trailing edge when a width recording method is selected, to use a spot signal. 4. The information reproducing apparatus according to claim 1, further comprising a function of reproducing data using one of a leading edge and a trailing edge when a recording method is selected. Information recording / reproducing device. 5. A function for temporarily storing data reproduced by a reproduction circuit, and for converting the data into recording information of a recording system different from that used in reproduction by the recording information generating circuit. Or the information recording / reproducing apparatus according to 4.