JPH09167348A - Optical disc recording method, recording device, reproducing method, and reproducing device - Google Patents

Abstract

(57) [PROBLEMS] To increase recording density and transfer rate by changing recording / reproducing conditions depending on whether data is recorded / reproduced on a land or a groove. An optical disk recording apparatus for recording data by irradiating an optical disk having a land and a groove with a light beam to form a mark representing the data on the optical disk, wherein the size of the mark representing the data is A means for changing the irradiation condition of the light beam is provided according to whether the position where the mark is to be formed is a land or a groove so that the groove is the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording method, recording device, reproducing method and reproducing device. In particular, the present invention relates to a rewritable optical disc recording method, recording device, reproducing method, and reproducing device.

[0002]

2. Description of the Related Art Optical discs are known as large-capacity recording media, but with the recent increase in the amount of data and recording of large-capacity data such as video signals, the present recording capacity is becoming insufficient. .

The optical disc is usually provided with a groove for guiding a light spot. Since it is technically easy in a conventional optical disc, data is recorded only on one of a land (groove portion) and a groove (between grooves). It was However, with the demand for higher density, land / groove recording, which records data on both lands and grooves, has begun to attract attention.

Conventional land / groove recording uses the same recording method, assuming that the land and groove characteristics are the same, although the land and groove recording characteristics are actually different. When reproducing data from a disc on which data is recorded, the same reproducing method is used. In other words, the same recording circuit and reproducing circuit and recording circuit and reproducing circuit having the same characteristics are used for recording and reproducing the land and the groove.

[0005]

However, the above-mentioned prior art has the following problems. That is, the land and the groove are actually different in C / N ratio (power ratio of carrier and noise), recording sensitivity and frequency characteristics. In the conventional land / groove recording, recording / reproducing is performed in exactly the same manner for the land and the groove. When recording is performed on lands and grooves having different C / N ratios by the same recording method, for example, the recording density is set according to the characteristics of the lands having a small C / N ratio. As a result, the recording density of the groove having a large C / N ratio has an unnecessary margin, and the recording density in the groove cannot be maximized. Therefore, in the entire disc, the recording density and the recordable data capacity cannot be maximized.

Further, the land and the groove having different recording sensitivities are recorded by the same recording method. For example,
If the recording method adapted to the land is used, the groove cannot be recorded under the optimum condition. As a result, the bit error rate in the groove increases, and recording cannot be performed at a sufficient recording density.

Even during reproduction, equalization (correction) of frequency components such as high-frequency emphasis is performed using the same frequency characteristic. However, the frequency characteristics of the reproduced signal are different between the land and the groove. Therefore, if the signals reproduced from the land and the groove are equalized with the same frequency characteristic, the frequency characteristic of the signal reproduced from the land and the groove cannot be properly equalized.

The present invention has been made to solve the above problems, and an object of the present invention is to perform recording / reproducing in accordance with recording sensitivity of land and groove, C / N ratio and frequency characteristic. Accordingly, it is an object of the present invention to provide an optical disc recording method, recording device, reproducing method, and reproducing device capable of increasing the recording capacity of an optical disc, improving the transfer rate, and improving the quality of a reproduced signal.

[0009]

An optical disk recording method according to the present invention is an optical disk for recording data by irradiating an optical disk having lands and grooves with a light beam to form marks representing the data on the optical disk. A recording method, wherein the size of the mark representing the data is the same in the land and the groove, and the light is output depending on whether the position where the mark is formed is the land or the groove. The irradiation conditions of the beam are changed so that the above-mentioned object is achieved.

In one embodiment, depending on whether the land or the groove is irradiated with the light beam,
Irradiate a light beam with different intensities.

In one embodiment, the land is irradiated with the light beam with an intensity higher than that of the groove.

An optical disk recording apparatus according to the present invention is an optical disk recording apparatus for recording data by irradiating an optical disk having lands and grooves with a light beam to form marks representing the data on the optical disk. The irradiation condition of the light beam is changed depending on whether the position where the mark is to be formed is the land or the groove so that the size of the mark representing the data is the same in the land and the groove. Means are provided by which the above objectives are achieved.

In one embodiment, depending on whether the land or the groove is irradiated with the light beam,
Means are provided for recording the data by irradiating light beams of different intensities.

In one embodiment, the data is recorded on the land by irradiating the land with the light beam having an intensity higher than that of the groove.

In one embodiment, means for generating land / groove position information indicating which of the land and the groove the spot of the light beam is located on, and a means of different intensity depending on the land / groove position information. Means for irradiating the light beam.

In one embodiment, the input data is first
Data dividing means for dividing into data and second data,
A first light beam generating means for recording the first data on the land by irradiating it with a light beam of a first intensity, and recording the second data in the groove by irradiating a light beam of a second intensity. Second light beam generating means.

In one embodiment, the optical disc includes a phase change recording layer.

In one embodiment, depending on which of the land and the groove is irradiated with the light beam,
The irradiation time of the light beam is changed.

In one embodiment, the land is irradiated with the light beam for a longer period of time than the groove.

In one embodiment, the step of irradiating the light beam n times (n is an integer of 2 or more) in order to form the mark, wherein either the land or the groove is irradiated with the light beam. The timings of the first irradiation and the n-th irradiation are changed depending on whether or not.

In one embodiment, an interval between the first irradiation and the n-th irradiation on the land is wider than an interval between the first irradiation and the n-th irradiation on the groove.

In one embodiment, means for generating land / groove position information indicating whether the spot of the light beam is located on the land or the groove, and the light beam n for forming the mark. Times (n is 2
The above-mentioned integer) irradiating means, and means for changing the timing of the first irradiation and the n-th irradiation depending on which of the land and the groove is irradiated with the light beam. There is.

In one embodiment, the interval between the first irradiation and the n-th irradiation on the land is wider than the interval between the first irradiation and the n-th irradiation on the groove.

An optical disk recording method according to the present invention is an optical disk recording method for recording data by irradiating an optical disk having lands and grooves with a light beam to form marks representing the data on the optical disk. The data recording condition is changed depending on which of the land and the groove is irradiated with the light beam, thereby achieving the above object.

In one embodiment, depending on whether the land or the groove is irradiated with the light beam,
Record data of different densities.

In one embodiment, data having a density lower than that of the groove is recorded on the land.

An optical disk reproducing method according to the present invention is an optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, the data being the land and the land. If the data recording density is different depending on which one of the grooves is recorded, the method includes the step of combining the data having different transfer rates reproduced from the land and the groove. The above object is achieved by the above.

An optical disk reproducing method according to the present invention is an optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk. If it is lower than the data recording density of the groove, it includes the step of combining the data having different transfer rates reproduced from the land and the groove, thereby achieving the above object.

In one embodiment, depending on whether the land or the groove is irradiated with the light beam,
Recording the data with different modulation schemes.

In one embodiment, data is recorded on the land by a modulation method having a density ratio lower than that of the groove.

An optical disk reproducing method according to the present invention is an optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, the data being the land and the land. If the modulation method is different depending on which of the grooves is recorded, it includes the step of demodulating by a different method depending on which data is reproduced from which of the land and the groove, Thereby, the above object is achieved.

An optical disk reproducing method according to the present invention is an optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, and the density of a modulation method of the land. If the ratio is lower than the density ratio of the modulation method of the groove,
It includes the step of demodulating by different methods depending on whether the data is reproduced from the land or the groove, thereby achieving the above object.

The optical disk reproducing method according to the present invention is an optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, the data being the land and the land. It includes the step of equalizing the reproduced data with different frequency characteristics depending on which of the grooves is recorded, which achieves the above object.

In one embodiment, the high frequency component of the data reproduced from the land is amplified by a gain larger than the high frequency component of the data reproduced from the groove.

An optical disk reproducing apparatus according to the present invention is an optical disk reproducing apparatus for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, the data being the land and the land. Means for equalizing the reproduced data with different frequency characteristics depending on which of the grooves is recorded is provided, thereby achieving the above object.

In one embodiment, the high frequency component of the data reproduced from the land is amplified by a gain larger than that of the high frequency component of the data reproduced from the groove.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION According to the optical disc recording method, recording apparatus, reproducing method, and reproducing apparatus of the present invention, different laser powers are used depending on whether recording or reproducing is performed on a land or a groove of the optical disk. , Recording / reproduction is performed by using recording compensation, recording density, modulation method or frequency characteristic.

Embodiments of the present invention will be described in detail below with reference to the drawings. The same reference numerals in the drawings
Represents the same component.

In the present specification, the term "recording device" also includes a recording device including a device for reproducing data.
Similarly, the term "reproduction device" also includes a reproduction device including a device for recording data.

(Embodiment 1) FIG. 1 is a diagram showing the relationship between the position on the optical disk and the laser beam intensity in the first embodiment of the optical disk recording method according to the present invention.
The optical disc 11 is a disc-shaped recording medium, and at least one surface thereof has a land 1 for recording data.
2 and a groove 13 are provided. Optical disk 1
1 has a substrate 15 containing polycarbonate, a reflective layer 16 containing aluminum and a recording layer 17 containing an alloy of germanium, tellurium and antimony. This optical disk 11 is used in all the following embodiments. The land 12 and the groove 13 are the optical disc 1
The land 12 is spirally formed on the surface of
Digital data is recorded in the groove 13.
Hereinafter, for simplicity, recording data on both the land 12 and the groove 13 is referred to as "land / groove recording". The optical disk 11 is an optical disk capable of land / groove recording. Data recording,
When performing reproduction and erasure, the laser beam (not shown) irradiates the land or groove with the laser beam 14.

The optical disk 11 is, for example, a phase change type optical disk. In this case, a strong laser beam is irradiated for a short time at the time of recording data. As a result, the portion irradiated with the laser beam (the spot of the laser beam) is
It is heated to a temperature above the melting point of the material of the disk 11 and then rapidly cooled to become an amorphous phase. This amorphous phase portion is recorded as a "mark" on a land or groove on the disc. To erase this mark,
The mark is heated above the crystallization temperature and gradually cooled. As a result, the mark returns to the crystalline phase and can be erased. To reproduce data, the disk 11 is irradiated with a laser beam weaker than that during recording. Since the amorphous phase (marked portion) and the crystalline phase (non-marked portion) have different reflectances, it can be discriminated whether it is a mark or not by the intensity of reflected light.

In the present specification, a portion protruding toward the light incident side is called a "groove", and a portion protruding toward the light incident side is called a "land". In the optical disc 11 having the structure shown in FIG. 1, when the land 12 and the groove 13 have the same width, the groove 13 has a higher recording sensitivity due to a difference in heat radiation condition. The "recording sensitivity" is determined by the recording laser power and the erasing laser power (hereinafter referred to as "optimum recording power" and "optimum erasing power", respectively) for obtaining the C / N ratio of 50 dB and the erasing rate of 25 dB during recording and reproduction. . It can be said that the smaller the optimum recording power and the optimum erasing power, the higher the recording sensitivity. The phase change type optical disk is made of the above-mentioned materials, and the land width WL and the groove width WG are 0.74
μm, track pitch TP is 1.48 μm, depth D is λ
/ 6 (λ = 680 nm), when the circumferential linear velocity of the spot of the laser beam is 6.0 m / s (these parameters do not change in all the examples below).
The optimum recording power in the land is 11 mW, the optimum erasing power is 5.5 mW, the optimum recording power in the groove is 10 mW, and the optimum erasing power is 5.0 mW.
Since the recording sensitivity of the groove 13 is higher than that of the land 12 here,
Data can be recorded in the groove 13 with a smaller laser power.

In the first embodiment, when land / groove recording is performed on the optical disk 11, recording is performed on the land 12 and recording on the groove 13 depending on the difference in recording sensitivity between the land 12 and the groove 13. , The laser power used is changed. Specifically, as shown in FIG. 1, recording is performed on the land 12 with laser power having a peak value PL and on the groove 13 with laser power having a peak value PG. At this time, if the formed marks have the same length, the width of the pulse for driving the laser diode is the same when recording on the land 12 and on the groove 13. As a result, proper recording can be performed on each of the land and the groove. If recording is performed on the highly sensitive groove 13 with the laser power having the peak value PL, the width and length of the mark portion recorded on the groove 13 becomes larger than a desired value, and as a result, at the time of reproduction. Bit error rate increases. Conversely, if the land 12 having low sensitivity is recorded with the laser power having the peak value PG, the width and length of the mark portion recorded on the land 12 becomes smaller than the desired value, and as a result, After all, the bit error rate at the time of reproduction becomes large.

FIG. 1B is a diagram showing a land recording pulse and a groove recording pulse and recorded marks in the first embodiment. The amplitude IL of the pulse for recording on the land is larger than the amplitude IG of the pulse for recording on the groove.

FIG. 2 is a block diagram of a first embodiment of an optical disk recording apparatus according to the present invention. Digital data is recorded on the phase-change optical disk 11 for land / groove recording by mark edge recording. This mark edge recording is a recording method that represents digital data by the position of the edge of the mark portion recorded on the disc in the circumferential direction of the disc. In the optical disc 11, the recording sensitivity of the groove is higher than the recording sensitivity of the land. The spindle motor 22 rotates the optical disc 11. As a result, the optical head 2 that emits two beams
3 can trace spiral lands and grooves. Since the optical head 23 irradiates one beam on the land and the other beam on the groove, it is possible to simultaneously record on the land and the groove. The servo circuit 24 focuses the laser beam of the optical head 23 on the land and the groove, and
Perform tracking.

The data divider 29 divides one input data string into two output data and outputs it. In particular,
The data divider 29 divides the input data sequence into a land data sequence and a groove data sequence so that the transfer rates of the output data sequences are equal. The land data string is given to the recording signal processor 27, and the groove data string is
It is provided to the recording signal processor 28. In FIG. 2, the input data sequence is represented by "A, B, C, D, E, F", the land data sequence is represented by "A, C, E", and the groove data sequence is represented by "B, D, F". Each is shown schematically.

The recording signal processors 27 and 28 receive the land data sequence and the groove data sequence, respectively, and perform modulation and recording compensation. As a modulation method, for example, EFM (eight to fourteen modulation) is used. As the recording compensation, for example, the generation timing of a multi-pulse which will be described later is changed between the land and the groove. The recording signal processors 27 and 28 output the land recording signal corresponding to the land data string and the groove recording signal corresponding to the groove data string to the laser drive circuits 25 and 26, respectively.

The laser driving circuits 25 and 26 respectively use the land recording signal and the groove recording signal which are input, to generate a laser diode (not shown) of the optical head 23.
Is modulated and output to the optical head 23. The optical head 23 irradiates the optical disc 11 with two laser beams according to the amplified land recording signal and groove recording signal, thereby recording the land data sequence and the groove data sequence on the optical disc 11.

The outputs of the laser drive circuit 25 and the laser drive circuit 26 are set in consideration of the difference in recording sensitivity between the land and the groove described above. That is, the land recording signal has higher power than the groove recording signal. Specifically, when the optical disc 11 having the above-mentioned parameters is used, the peak values PL and PG of FIG.
W and 10 mW. As shown in FIG. 1, the land and groove recording pulses have different current peak values. Although a plurality of pulses are used to form one mark in FIG. 1, the present invention is not limited to this. For example, one pulse may form one mark.

In order to compensate for the difference in recording sensitivity between the land and the groove, (the optimum recording power of the land):
(Optimum recording power of groove) = (Peak value PL):
(Peak value PG) is preferable.

In the first embodiment, as the irradiation condition, the intensity of the laser beam irradiated for recording is changed according to whether the beam spot is located on the land or the groove. Specifically, as described above, the land / groove recording is performed so that the laser power for recording on the land and the laser power for recording on the groove are different according to the difference in recording sensitivity between the land and the groove. Do it. As a result, it is possible to perform recording with power suitable for each of the land and the groove having different recording sensitivities. As a result, there is an effect that the bit error rate when reproducing data from the optical disc can be reduced.

FIG. 3 is a block diagram of the data divider 29 shown in FIG. The switch 33 has an input data string A,
B, C, D, E and F are designated as buffer memories 31 and 32.
Alternately output to. Here, the data A to F forming the input data sequence are data packets having the same data length. The buffer memory 31 receives the data A, C and E, and the buffer memory 32 receives the data B, D.
And F. The frequency of the write clock WCK is twice the frequency of the read clocks RCK1 and RCK2. However, the configuration of the data divider 29 is not limited to that shown in FIG. For example, rather than two buffer memories, a single buffer memory may receive the input data stream. In this case, the switch for distributing the output data is switched according to the address designated at the time of reading.

In the above description, the optical head 23 irradiates the lands and grooves of the optical disk 11 with two laser beams to record the lands and grooves simultaneously. However, recording can also be performed by irradiating the optical disk 11 with a single laser beam.

FIG. 4 is a block diagram of an optical disk recording apparatus using an optical head for irradiating a single laser beam. The laser power control circuit 49 receives the input data string and the land / groove position information from the reproducing circuit 47,
The buffered input data sequence is recorded by the recording signal processor 27.
The laser power control signal to the laser drive circuit 46.
Output to The land / groove position information is recorded by the optical head 4.
It is information indicating whether 3 is located in the land or the groove. This land / groove position information can be obtained from the address data of the sector, for example. That is, the reproducing circuit 47 reads the address data at the same time when reading the data of each sector. Given a sector address, it can also be identified whether the sector is located in a land or a groove. The laser power control signal is applied to the laser drive circuit 46 to change the laser power applied to the optical disc 11. Based on the land / groove position information, the laser power control circuit 49 sets the laser power high when the optical head 43 is located on the land, and sets the laser power low when the optical head 43 is located on the groove. . As shown in FIG. 4, when recording the data A, B and C, the laser power is high because the optical head 43 is located on the land, and when recording the data D, E and F, the optical head 43 moves into the groove. The laser power is low because it is located at. The information on the laser power to be used for the land and the groove is written by pits in a lead-in area located inside the track of the disc, for example.

The optical disk recording apparatus having the structure shown in FIG.
Since the recording signal processor and the laser drive circuit need only be one system, the circuit scale can be reduced.

(Embodiment 2) FIG. 5 is a diagram showing the shapes of pulses used for recording on lands and grooves in the second embodiment of the optical disk recording method according to the present invention. The optical disc used in the second embodiment is the same as the optical disc 11 used in the first embodiment. That is, the land and the groove have the same width, and the recording sensitivity of the groove is higher than the recording sensitivity of the land.

Therefore, when land / groove recording is performed on such an optical disc, the bit error rate at the time of data reproduction can be lowered by performing recording compensation in consideration of the difference in recording sensitivity between the land and the groove. it can. Specifically, the pulse width for forming the mark is changed depending on whether the mark is formed on the land or the groove. As a result, an error is less likely to occur in the edge position of the mark recorded on the land and the groove. As shown in FIG. 5, the land recording mark signal and the groove recording mark signal are pulses having the same peak value P. However, since the recording sensitivity of the land is lower than the recording sensitivity of the groove, the laser power required to form the same mark is higher in the land than in the groove. Therefore, the land recording pulse rises earlier by the time tL than the rising edge of the groove recording pulse, and falls later by the time tT than the falling edge of the groove recording pulse.

FIG. 6 is a block diagram of a second embodiment of an optical disk recording apparatus according to the present invention. Digital data is recorded on the phase-change optical disk 11 for land / groove recording by mark edge recording. The data divider 29 divides one input data string into two output data strings, that is, a land data string and a groove data string, and outputs them, as described in the first embodiment.

The recording signal processor 67 receives the land data string, modulates it, and then outputs a land recording signal corresponding to the land data string to the recording compensation circuit 65.
The recording signal processor 68 receives the groove data sequence, modulates the groove data sequence, and then outputs a groove recording signal corresponding to the groove data sequence to the recording compensation circuit 66. As a modulation method, for example, EFM is used.

The recording compensation circuits 65 and 66 receive the land recording signal and the groove recording signal, respectively, and compensate the edge position of the recorded mark. In particular,
The width of a pulse for recording on a land with low recording sensitivity (hereinafter referred to as "land pulse") is wider than the width of a pulse for recording on a groove with high recording sensitivity (hereinafter referred to as "groove pulse"). The pulse width of the recording signal is set so that The land pulse and the groove pulse have the same amplitude (that is, laser power). When a land and a groove are irradiated with a laser beam with the same pulse width and the same pulse amplitude, the length of the mark formed on the land with low sensitivity becomes shorter than the length of the mark formed on the groove with high sensitivity. Is called "edge shift"). Therefore, by making the width of the land pulse wider than the width of the groove pulse, the edge position of the recorded mark is compensated so that the land and the groove have the same position (that is, no edge shift occurs). Can be done.

The recording compensation circuits 65 and 66 are the same as those in the first embodiment.
It also has the function of the laser drive circuit. Optical head 23
Irradiates the optical disc 11 with two laser beams according to the compensated outputs from the recording compensation circuits 65 and 66, thereby recording the land data sequence and the groove data sequence on the optical disc 11.

In the second embodiment, as the irradiation condition, the width of the pulse used for recording (that is, the positions of the rising edge and the falling edge) depends on whether the beam spot is located on the land or the groove. Changing. If the data is recorded as described above, both the marks recorded on the land and the marks recorded on the groove are recorded without causing edge shift even if the optical sensitivity is different between the land and the groove. be able to.

When the optical disk 11 having the parameters described in the first embodiment is used, the time tL in FIG. 5 is 2 ns, the time tT is 2 ns, and the pulse width WL of the land pulse is 74 n.
s, the pulse width WG of the groove pulse is 70 ns.

As in the first embodiment, an optical head 43 for irradiating a single laser beam may be used instead of the optical head 23 for irradiating two laser beams.

(Embodiment 3) FIG. 7 shows waveforms of a land pulse and a groove pulse in a third embodiment of the optical disc recording method according to the present invention. As shown in FIG. 5, in the second embodiment, when recording one mark, one land pulse or one groove pulse was used. In the third embodiment, a plurality of pulses called multi-pulses are used to record one mark. Here, "one pulse" refers to a waveform that starts with the transition from the first level to the second level and ends with the subsequent transition from the second level to the first level. For example, in FIG. 5, the pulse for recording one mark starts with the transition from the L level to the H level and ends with the subsequent transition from the H level to the L level.

In FIG. 7, the input data for recording a single mark is a single pulse. The land pulse and the groove pulse corresponding to this input data have a leading pulse, an intermediate pulse, and a final pulse, respectively. The input data, the land pulse, and the groove pulse in FIG. 7 are all digital data having a value of 0 or 1. The first pulse is the first pulse of n (where n is 2 or more) pulses, and the last pulse is the nth pulse of the n pulses. When n = 2, the intermediate pulse and the final pulse are the same. In FIG. 7, there are three intermediate pulses between the first pulse and the last pulse.

The leading pulse rises with a predetermined delay time with respect to the rising edge of the input data, and the final pulse falls with a predetermined leading time with respect to the falling edge of the input data. In FIG. 7, the time between the rising edge of the input data and the center of the head pulse of the land pulse is a delay time a, and the time between the rising edge of the input data and the center of the head pulse of the groove pulse is a delay time c. And Also, the time between the falling edge of the input data and the center of the final pulse of the land pulse is the leading time b, and the time between the falling edge of the input data and the center of the last pulse of the groove pulse is the leading time d. And If the recording sensitivity of the groove is higher than the recording sensitivity of the land, the land pulse and the groove pulse are set so that (delay time a) <(delay time c) and (lead time b) <(lead time d) are satisfied. It is necessary to set. This is because the recording sensitivity of the groove is higher than that of the land, so that when the land and the groove are recorded with the pulse of the same shape, the width and the length of the mark recorded in the groove are larger than that of the land. Conversely, if the land recording sensitivity is higher than the groove recording sensitivity,
(Delay time c) <(Delay time a) and (Preceding time d) <
It is necessary to set the land pulse and the groove pulse so as to satisfy (leading time b).

Here, the application of the pulse used for recording and the irradiation of the laser beam are carried out substantially at the same time.
Therefore, in this specification, the "time interval between the irradiation of the laser beam by the leading pulse and the irradiation of the laser beam by the final pulse" is defined by "the time interval between the center of the leading pulse and the center of the final pulse". And Here, the "pulse center" is located at the center between the rising edge and the falling edge of the pulse. As shown in FIG. 7, the time interval between the center of the land leading pulse and the center of the last pulse is longer than the time interval between the center of the groove leading pulse and the center of the last pulse.

The intermediate pulse is a burst-like repetitive pulse, and the land pulse and the groove pulse have the same shape and the same phase position.

FIG. 8 is a block diagram of the third embodiment of the optical disk recording apparatus according to the present invention. The optical disk recording apparatus shown in FIG. 8 uses the land pulse and groove pulse shown in FIG. 7 to record data on an optical disk having different land and groove recording sensitivities.

The optical head 43 and the servo circuit 44 have the same functions as described with reference to FIG. The recording compensation circuit 81 receives the input data to be recorded and modulates it. As a modulation method for mark edge,
EFM is used, but not limited to this, and (1, 7) modulation or (2, 7) modulation may be used, for example. The recording compensating circuit 81 controls the land / output from the reproducing circuit 47.
In accordance with the groove position information, the same land pulse or groove pulse as in FIG. 7 is generated, and the laser drive circuit 8
Output to 2. The land / groove position information may be generated as described with reference to FIG. The laser drive circuit 82 receives the land pulse and the groove pulse, and outputs sufficient power to drive a laser diode (not shown) included in the optical head 43. The laser driving circuit 82 records by modulating the laser diode with the recording power and the erasing power.

When the optimum recording powers of the land and the groove of the optical disk are 10 mW and 5 mW, respectively,
Delay times a and c of 35 ns and 37 ns, respectively
To the leading times b and d of 35 ns and 37, respectively.
If it is ns, in both land and groove,
It is possible to form marks having the same length in the disk circumferential direction.

In the third embodiment, as irradiation conditions, the timings of a plurality of pulses used for recording are changed depending on whether the beam spot is located on the land or the groove. According to the optical disc recording apparatus having the above configuration, even when the recording sensitivity of the land and the recording sensitivity of the groove are different, by using different multi-pulses for recording on the land and recording on the groove, the land and the groove are separated. It is possible to record marks of the same shape. As a result, the quality of the reproduced signal (for example, the bit error rate, the margin and the amount of jitter in servo control) in the land and the groove match. Therefore, since the land and the groove can be recorded with the same recording density, high density recording can be performed as the entire optical disc.

(Embodiment 4) FIG. 9 is a diagram schematically showing division of recorded data and combination of reproduced data in a fourth embodiment of the optical disc recording method and reproducing method according to the present invention.

The optical disk 11 is a disk capable of land / groove recording as in the first embodiment, and has lands 12 and grooves 13. Land 1
2 has a recording density d1, which means that the land 12 having a unit length can record d1 bits. The groove 13 has a recording density d2, which means that the unit length groove 13 can record d2 bits.

The input recording data 94 is (d1: d
The land recording data 95 and the groove recording data 96 are divided at the ratio of 2). For simplicity, (d1: d2) =
If (1: 2), the recorded data 94 is, for example, 1
Blocks A, C and E having a data length of 6 bits
And blocks B, D and F having a data length of 8 bits. The blocks A, C and E of the recording data 94 are converted into groove recording data 96 (blocks A ′, C ′ and E ′) by performing processing (for example, modulation and formatting) for recording in the groove. After that, it is recorded in the groove 13 of the optical disk 11. The blocks B, D, and F of the recording data 94 are similarly processed for recording on the land and converted into the land recording data 95 (blocks B ′, D ′, and F ′), and then the optical disk 11 of the optical disc 11 is recorded. Recorded on land 12.

The land recording data 95 and the groove recording data 96 are processed through different signal paths. In order to record the land recording data 95 and the groove recording data 96 on the land and the groove, respectively, two laser beams may be simultaneously recorded, or the land and the groove may be alternately recorded by using a single laser beam. May be recorded.

In FIG. 9, the length of block A'is equal to the length of block A. This indicates that the transfer rate of the groove recording data 96 is equal to the transfer rate of the recording data 94. On the other hand, the length of block B'is
It is twice the length of block B. This indicates that the transfer rate of the land recording data 95 is half the transfer rate of the recording data 94. In other words, the land recording data 95 is obtained by expanding a part of the data of the recording data 94 on the time axis.

At the time of reproduction, the land reproduction data 97 (blocks B ', D'and F') reproduced from the land and the groove reproduction data 98 (blocks A ', C'and E') reproduced from the groove are respectively generated. The processing is performed through different signal paths. In order to reproduce the land recording data 95 and the groove recording data 96 from the land and the groove, respectively, they may be reproduced simultaneously by using two laser beams, or by using a single laser beam and alternately from the land and the groove. You may play.
Contrary to the recording operation, the land reproduction data 97 is time-axis compressed and then combined with the groove reproduction data 98.
When the land reproduction data 97 and the groove reproduction data 98 are combined, demodulation and deformatting are performed, and reproduction data 99 is output.

FIG. 10 is a block diagram of the fourth embodiment of the optical disk recording apparatus according to the present invention. The phase-change type optical disk 11 capable of land / groove recording has a land having a recording density d1 and a groove having a recording density d2. Mark edge recording is performed on this optical disk 11. The optical head 23 irradiates the land and the groove with the two laser beams described with reference to FIG.

The data divider 107 inputs the recording data (blocks A to F) input as described with reference to FIG.
Is divided into land recording data (blocks B, D and F) and groove recording data (A, C and E). The data divider 107 divides the input recording data so that (data length of block of land recording data) :( data length of block of groove recording data) = d1: d2. Therefore, (transfer rate of land recording data): (transfer rate of groove recording data) = d1:
It becomes d2.

The recording signal processor 105 receives the land recording data, performs modulation and recording compensation, and outputs the land recording signal to the optical head 23. The recording signal processor 106 receives the groove recording data, performs modulation and recording compensation, and outputs the groove recording signal to the optical head 23. As a modulation method,
EFM is used. As the recording compensation, for example, the generation timing of the above-mentioned multi-pulse is changed between the land and the groove.

The optical head recording apparatus having the above structure can perform recording so that the recording densities of the land and the groove are d1 and d2, respectively. This makes it possible to increase the amount of recordable data for the entire optical disc.

FIG. 11 is a block diagram of the fourth embodiment of the optical disk reproducing apparatus according to the present invention. On the phase-change type optical disk 11, data is recorded on the land and the groove by the mark edge recording method by the optical disk recording apparatus shown in FIG. Land recording density is d
1 and the recording density of the groove is d2. The optical head 23 outputs a land reproduction signal and a groove reproduction signal to the reproduction signal processor 115 and the reproduction signal processor 116, respectively, by irradiating the land and the groove with two laser beams.

Playback signal processors 115 and 116
Respectively receives the land reproduction signal and the groove reproduction signal, generates land reproduction data and groove reproduction data, and outputs them to the data combiner 117. Specifically, the playback signal processors 115 and 116 amplify,
Equalize, binarize, and demodulate. Since the land recording density and the groove recording density are different from each other, the transfer rates of the land reproduction data and the groove reproduction data are also different. For example, when the land recording density is lower than the groove recording density (when d1 <d2)
The transfer rate of the land reproduction data is smaller than the transfer rate of the groove reproduction data.

The data combiner 117 outputs the reproduction data, which is a single data sequence, by receiving and combining the land reproduction data and the groove reproduction data having different transfer rates. Data combiner 117
Has a buffer memory, for example, and sequentially writes the land reproduction data and the groove reproduction data in different areas in the buffer memory. When reading, by alternately moving the pointer of the buffer memory between the two areas, the land reproduction data and the groove reproduction data can be output alternately.

The optical disk reproducing apparatus having the above structure can reproduce the data recorded on the land and the groove with different recording densities by the above operation.

In the fourth embodiment, as the recording condition, the recording density of the data to be recorded is changed depending on whether the beam spot is located on the land or the groove. By using the optical disc recording device and the optical disc reproducing device having the above-mentioned configurations, it is possible to record / reproduce at lands and grooves having different recording densities at recording densities suitable respectively. As a result, the quality of the recorded / reproduced signal (for example, the bit error rate, the servo margin, and the jitter amount) is homogenized between the land and the groove.
As a result, it is possible to increase the density of the optical disc as a whole, as compared with the case where the recording / reproducing characteristics (here, the recording density) are unified for either the land or the groove.

Even when the land and the groove have different frequency characteristics at the time of recording and at the time of reproducing, the recordable recording density is different between the land and the groove. Therefore, also in such a case, the same effect can be obtained.

(Embodiment 5) FIG. 12 is a diagram showing a modulation method used in a land and a groove in a fifth embodiment of the optical disc recording method according to the present invention. The optical disk 11 is an optical disk for land / groove recording having a land 12 and a groove 13. In the optical disk 11 in which the land and the groove are recorded under the same condition, the C / N ratio of the signal reproduced from the groove 13 is higher than the signal reproduced from the land 12. This is due to the difference in recording sensitivity between the land and the groove and the difference in reflectance of the laser beam. For example, the C / N ratio of the reproduction signal is 52 in the land.
While it is dB, it is 55 dB in the groove.

On the land 12 of the optical disk 11 as described above, (1,7) RLL (run length l) having a low recording density ratio is used.
Recording / reproduction is performed by (imited) modulation (hereinafter abbreviated as “(1,7) modulation”). Groove 1
In (3), recording / reproduction is performed by (2,7) modulation having a high recording density ratio. As a result, recording can be performed with a modulation method suitable for each land and groove.
Here, the recording density ratio refers to the number of bits of information included in the minimum inversion interval (hereinafter referred to as “density ratio”). Assuming that the period of data before modulation is T and the period of data after modulation (detection window width) is Tw, (1,7) modulation: Tw = 2T / 3 (2,7) modulation: Tw = T / 2 is there. The minimum inversion interval Tmin is (1,7) modulation: Tmin = 2Tw (2,7) modulation: Tmin = 3Tw. Therefore, the density ratio is (1,7) modulation: Dr = Tmin / T = 4/3 = 1.33 (2,7) modulation: Dr = Tmin / T = 3/2 = 1.5.

FIG. 13 is a block diagram of the fifth embodiment of the optical disk recording apparatus according to the present invention. Optical disk 1
Reference numeral 1 is a phase change type optical disk for land / groove recording. The optical disk 11 has a land 12 as shown in FIG.
And a groove 13. The C / N ratio of the land 12 is lower than the C / N ratio of the groove 13. Data is recorded on the optical disc 11 by mark edge recording. The optical head 23 has the same structure as that described with reference to FIG.
Irradiate the land and the groove with one laser beam at the same time. This records data.

The data divider 139, like the data divider 107 described with reference to FIG. 10, converts the input digital data (blocks A to F) into land recording data (blocks B, D and F) and grooves. The recording data (A, C, and E) is divided and output to modulators 137 and 138, respectively. Here, the blocks A, C and E have the same data length, and the blocks B, D and F have the same data length. Also (data length of block A):
(Data length of block B) = 1.33: 1.5 holds. The modulator 137 receives the land recording data,
It is modulated by the (1,7) modulation method. Modulator 138
Receives the groove recording data and modulates it by the (2,7) modulation method. Since the data lengths of the blocks input to the modulators 137 and 138 are 1.33: 1.5, the (1,7) -modulated and the (2,7) -modulated 2 are applied.
The minimum inversion intervals of the two data are almost equal.

Recording signal processors 135 and 136
Receives the outputs of the modulators 137 and 138, respectively, and performs recording compensation to output them as a land recording signal and a groove recording signal to the optical head 23. The recording signal processors 135 and 136, for example, perform recording compensation such as changing the generation timing of the above-described multi-pulse, and then perform sufficient amplification to drive a laser diode (not shown) included in the optical head 23.
In response to the signals output from the recording signal processors 135 and 136, the optical head 23 records data on the land and the groove, respectively. As a result, (1,7) -modulated data is recorded on the land, and (2,7) -modulated data is recorded on the groove. Therefore, it is possible to perform recording such that the minimum inversion interval of the land and the groove is substantially equal and the recording density of the land and the groove are different.

FIG. 14 is a block diagram of the fifth embodiment of the optical disk reproducing apparatus according to the present invention. Optical disk 1
1 is a land 12 and a groove 13 as shown in FIG.
Having. Data is recorded on the optical disc 11 by mark edge recording. The (1,7) -modulated data is recorded on the land, and the (2,7) -modulated data is recorded on the groove. As described with reference to FIG. 2, the optical head 23 can simultaneously reproduce the land and the groove by the two laser beams.

The optical head 23 outputs a land reproduction signal and a groove reproduction signal to reproduction signal processors 145 and 146, respectively, according to the data recorded on the land and the groove. The reproduction signal processors 145 and 146 output land reproduction data and groove reproduction data, which are digital data, to the demodulators 147 and 148 by processing the land reproduction signal and the groove reproduction signal, respectively. The reproduction signal processors 145 and 146 specifically perform signal amplification, equalization, and binarization processing.

The demodulators 147 and 148 are (1,7) modulated land reproduction data and (2,
7) The modulated groove reproduction data is received, demodulated, and then output to the data combiner 149. Data combiner 1
49 combines the demodulated land reproduction data and the groove reproduction data and outputs the combined data as a single data sequence.

By the above operation, the land is (1,7)
The data can be reproduced from the optical disc in which the modulated data is recorded and the (2,7) -modulated data is recorded in the groove. In the fifth embodiment, when the C / N ratio of the signal reproduced from the land and the C / N ratio of the signal reproduced from the groove are different, the minimum inversion intervals of the land and the groove are equal and the detection window widths are different. Record the data using. As a result, the quality of recorded / reproduced signals can be homogenized.

Consider a case where the land has a low C / N ratio. In this case, the minimum inversion interval in the land and the groove is the same, and the data is recorded in the land and the groove by the modulation method such that the detection window width in the land is wider than that in the groove. Even if the same amount of jitter occurs when reproducing a signal, the land detection window width is wider than the groove detection window width, so the size of the jitter for the detection window width is smaller for the land than for the groove. Become. By doing this, the land C / N ratio is the groove C / N.
Lower than the ratio can be compensated by changing the modulation method with land and groove. As a result, it is possible to increase the density of the optical disc as a whole, as compared with the case where recording and reproducing are performed on the land and the groove by the same modulation method.

In the fifth embodiment, the recording condition is the modulation method of the recorded data, and the reproduction condition is the demodulation method of the recorded data depending on whether the beam spot is located on the land or the groove. Are changing. Specifically, in a phase-change optical disc in which the land C / N ratio is 52 dB and the groove C / N ratio is 55 dB, (1, 7) modulation is performed for land recording and (2, 7) modulation is performed for groove recording. ) Preference is given to using modulation.

Even if the land and the groove have different frequency characteristics, the fifth embodiment can be applied and the same effect can be obtained.

(Embodiment 6) FIGS. 15A and 15B show a sixth embodiment of the optical disk reproducing method according to the present invention.
It is a figure which shows the frequency-amplitude characteristic of the signal reproduced from the groove and the land, respectively. 15 (c) and (d)
FIG. 11 is a diagram showing frequency characteristics of equalization processing to be performed on signals reproduced from a groove and a land in the sixth embodiment of the optical disc reproducing method according to the present invention.
FIG. 15 (e) shows a sixth example of the optical disc reproducing method according to the present invention.
FIG. 6 is a diagram of an optical disc used in the embodiment of FIG.
In (a) to (d), the horizontal axis represents frequency and the vertical axis represents amplitude.

The optical disk 11 is an optical disk for land / groove recording for recording data on both the land 12 and the groove 13. As shown in FIGS. 15A and 15B, the amplitude of the high frequency component of the signal reproduced from the land 12 is smaller than the amplitude of the high frequency component of the signal reproduced from the groove 13. In other words, the groove has a higher gain in the high range than the land. Specifically, frequency 5M
At Hz, the amplitude of the signal reproduced from the land 12 is 3d greater than the amplitude of the signal reproduced from the groove 13.
B lower. This difference in frequency characteristics results in different beam spots on the land and groove, resulting in different spot sizes and shapes, resulting in blunted signal waveforms even when recording marks of the same shape. caused by.

When performing land / groove recording on such an optical disk 11, the equalization processing (equalizing) is performed on the reproduced signal in consideration of the difference in frequency characteristics of the signal reproduced from the land and the groove. Do it. For example, by emphasizing the high frequency band by the frequency characteristics shown in FIGS. 15C and 15D, the reproduced signal can be equalized so as to have a desired frequency / amplitude characteristic. As a result, the bit error rate of the reproduced signal can be reduced.

FIG. 16 is a block diagram of the sixth embodiment of the optical disk reproducing apparatus according to the present invention. Optical head 23
As described with reference to FIG. 2, reproduces a signal corresponding to the data recorded on the land and the groove, and outputs the reproduced land reproduction signal and the groove reproduction signal to the equalizers 165 and 166, respectively. Here, comparing the frequency / amplitude characteristics of the land reproduction signal and the groove reproduction signal, the amplitude of the groove reproduction signal in the high range is higher than that of the land reproduction signal due to the difference in the frequency characteristics of the land and the groove of the optical disk 11 as described above. Greater than the amplitude in the region. The land reproduction signal is obtained by the equalizer 165, and the groove reproduction signal is obtained by the equalizer 1.
66, each is amplified with a predetermined frequency characteristic,
Output to the reproduction signal processors 167 and 168. The equalizer 165 has a higher gain than the equalizer 166 at high frequencies. As a result, the difference between the frequency and amplitude characteristics of the land reproduction signal and the groove reproduction signal is
Canceled. Reproduction signal processor 167 and 1
68 receives the signals equalized by the equalizers 165 and 166, converts them into digital data, and outputs them to the data combiner 169. Data combiner 169
Has the same function as described with reference to FIG.
The two input digital data are multiplexed on the time axis and output as a single data.

In the sixth embodiment, as the reproduction condition, the frequency characteristic when reproducing the recorded data is changed depending on whether the beam spot is located on the land or the groove. Specifically, as described above, the signals reproduced from the land and the groove are equalized by the equalizers having different frequency characteristics, so that the reproduced signal having a desired frequency component can be obtained. As a result, it is possible to suppress the bit error rate to a low level even for optical discs in which the frequency characteristics of signals reproduced from lands and grooves are different.

For example, when the optical disk 11 having the parameters described in the first embodiment is used, if the gain of the equalizer 165 is 3 dB higher than the gain of the equalizer 166 at the frequency of 5 MHz, the frequency characteristic difference between the land and the groove is canceled. it can. The sixth embodiment can also be applied to the case of reproducing data from the optical disc recorded by the recording method or the recording device described in the first to fifth embodiments. Thereby, the bit error rate can be further reduced.

In Examples 1 to 6, the phase change type optical disk was used as the optical disk, but the present invention can be applied to the magneto-optical disk.

In Examples 1 to 6, the irradiation condition of the laser beam, the recording condition, or the reproducing condition was changed depending on which of the land and the groove was used for recording.
To achieve this, recording may be performed using a single laser beam as described with reference to FIG. 2, or recording may be performed using two laser beams as described with reference to FIG. You may. Further, recording may be performed using three or more laser beams.

In the first to sixth embodiments, a disk-shaped optical disk has been described as an example of the recording medium, but any medium can be used as long as the data can be recorded in the land and the groove, and the recording medium is not limited to this. For example, it may be a card-shaped optical recording medium or a tape-shaped optical recording medium. Further, although the laser diode is used as the means for irradiating the light beam, it is not limited to this. For example, by combining a light emitting element that generates a light beam of a constant intensity and an optical modulator whose transmittance changes according to input data,
You may irradiate with a light beam.

The optical disc recorded by the method and apparatus described in the first to third embodiments can reproduce data by the conventional reproducing method and apparatus.

It is also possible to combine the methods described in the first to sixth embodiments and combine the devices. For example, the method and apparatus for changing the laser power between the land and the groove described in the first embodiment and the method and apparatus for changing the width and timing of the recording pulse described in the second and third embodiments may be combined. By doing this, the size of the marks formed on the lands and grooves in the radial direction of the disc (called the "width" of the mark) and the size in the circumferential direction (called the "length" of the mark) should be set optimally. You can That is, the change in laser power mainly contributes to the change in the mark width, and the pulse width and the pulse timing mainly contribute to the change in the mark length.

[0113]

According to the present invention, a laser beam is emitted with different laser power depending on whether recording is performed on a land or a groove. This has the effect of reducing the bit error rate.

According to the present invention, the laser beam is emitted with different pulse widths depending on whether the land or the groove is recorded. As a result, the edge shift can be reduced, and as a result, the bit error rate can be reduced.

According to the present invention, different recording compensation is performed depending on whether recording is performed on the land or the groove. This homogenizes the quality of the reproduced signal and enables high-density recording.

According to the present invention, recording is performed at different recording densities depending on whether recording is performed on the land or the groove. This enables high density recording.

According to the present invention, recording is performed by different modulation methods depending on which of the land and the groove is used for recording. This enables high density recording.

According to the present invention, the signals reproduced with different frequency characteristics are equalized depending on whether the reproduction is performed from the land or the groove. This can reduce the bit error rate.

[Brief description of the drawings]

1A is a diagram showing a relationship between a position on an optical disc and a laser beam intensity in a first embodiment of an optical disc recording method according to the present invention, and FIG. 1B is a diagram showing the first embodiment. It is a figure which shows the pulse for land recording in the example, the pulse for groove recording, and the recorded mark.

FIG. 2 is a block diagram of a first embodiment of an optical disk recording device according to the present invention.

FIG. 3 is a block diagram of the data divider shown in FIG.

FIG. 4 is a block diagram of an optical disk recording apparatus using an optical head that irradiates a single laser beam.

FIG. 5 is a diagram showing a shape of a pulse used for recording on a land and a groove in the second embodiment of the optical disc recording method according to the present invention.

FIG. 6 is a block diagram of a second embodiment of an optical disk recording device according to the present invention.

FIG. 7 shows waveforms of land pulses and groove pulses in a third embodiment of the optical disc recording method according to the present invention.

FIG. 8 is a block diagram of a third embodiment of an optical disk recording device according to the present invention.

FIG. 9 is a diagram schematically showing division of recorded data and combination of reproduced data in a fourth embodiment of an optical disc recording method and reproducing method according to the present invention.

FIG. 10 is a block diagram of a fourth embodiment of an optical disc recording apparatus according to the present invention.

FIG. 11 is a block diagram of a fourth embodiment of an optical disk reproducing apparatus according to the present invention.

FIG. 12 is a diagram showing a modulation method used for lands and grooves in a fifth embodiment of the optical disc recording method according to the present invention.

FIG. 13 is a block diagram of a fifth embodiment of the optical disc recording apparatus according to the present invention.

FIG. 14 is a block diagram of a fifth embodiment of an optical disk reproducing apparatus according to the present invention.

15A and 15B are diagrams showing frequency / amplitude characteristics of a signal reproduced from a groove and a land in a sixth embodiment of the optical disc reproducing method according to the present invention. (c) and (d) are diagrams showing the frequency characteristics of the equalization processing to be performed on the signals reproduced from the groove and the land, respectively, in the sixth embodiment of the optical disc reproducing method according to the present invention. (e) is a diagram of an optical disk used in a sixth embodiment of the optical disk reproducing method according to the present invention.

FIG. 16 is a block diagram of a sixth embodiment of the optical disc reproducing apparatus according to the present invention.

[Explanation of symbols]

 11 optical disk 22 spindle motor 23 optical head 24 servo circuit 25, 26 laser drive circuit 27, 28 recording signal processor 29 data divider

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Ueoka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (28)

[Claims] 1. An optical disk recording method for recording data by irradiating an optical disk having a land and a groove with a light beam to form a mark representing the data on the optical disk, the mark representing the data. The optical disk recording method in which the irradiation condition of the light beam is changed according to whether the position where the mark is to be formed is in the land or the groove so that the size becomes the same in the land and the groove. 2. The optical disk recording method according to claim 1, wherein the light beam is irradiated with different intensities depending on which of the land and the groove is irradiated with the light beam. 3. The optical disc recording method according to claim 2, wherein the land is irradiated with the light beam with an intensity higher than that of the groove. 4. An optical disk recording apparatus for recording data by irradiating an optical disk having a land and a groove with a light beam to form a mark representing the data on the optical disk, the mark representing the data. Disk recording comprising means for changing the irradiation condition of the light beam depending on whether the position where the mark is to be formed is the land or the groove so that the size of the marks is the same in the land and the groove. apparatus. 5. The optical disk according to claim 4, further comprising means for recording the data by irradiating the land or the groove with a light beam having a different intensity depending on which of the land and the groove is irradiated with the light beam. Recording device. 6. The optical disc recording apparatus according to claim 5, wherein the data is recorded on the land by irradiating the light beam having an intensity higher than that of the groove. 7. A land / position indicating whether the spot of the light beam is located on the land or the groove.
The optical disc recording apparatus according to claim 4, further comprising: a unit for generating groove position information; and a unit for irradiating the light beam having different intensities according to the land / groove position information. 8. A data dividing means for dividing input data into first data and second data, and a first light beam for recording the first data on the land by irradiating a light beam having a first intensity. The optical disc recording device according to claim 4, further comprising: a generating unit; and a second light beam generating unit that records the second data in the groove by irradiating a light beam having a second intensity. 9. The optical disc recording apparatus according to claim 7, wherein the optical disc includes a phase change recording layer. 10. The optical disk recording method according to claim 1, wherein the irradiation time of the light beam is changed depending on which of the land and the groove is irradiated with the light beam. 11. The optical disk recording method according to claim 10, wherein the land is irradiated with the light beam for a longer time than the groove. 12. A step of irradiating the light beam n times (n is an integer of 2 or more) to form the mark, depending on which of the land and the groove is irradiated with the light beam. The optical disc recording method according to claim 1, wherein the timing of the first irradiation and the timing of the nth irradiation are changed. 13. The optical disc according to claim 12, wherein an interval between the first irradiation and the n-th irradiation on the land is wider than an interval between the first irradiation and the n-th irradiation on the groove. Recording method. 14. Means for generating land / groove position information indicating whether the spot of the light beam is located on the land or the groove, and the light beam is formed n times (n times) to form the mark. Is an integer of 2 or more), and means for changing the timing of the first irradiation and the n-th irradiation depending on which of the land and the groove is irradiated with the light beam. The optical disk recording apparatus according to claim 4, which is provided. 15. The optical disc according to claim 14, wherein an interval between the first irradiation and the n-th irradiation on the land is wider than an interval between the first irradiation and the n-th irradiation on the groove. Recording device. 16. An optical disk recording method for recording data by irradiating an optical disk having a land and a groove with a light beam to form a mark representing the data on the optical disk, wherein the land and the groove are recorded. An optical disk recording method in which a data recording condition is changed depending on which side is irradiated with the light beam. 17. The optical disc recording method according to claim 16, wherein data having different densities are recorded depending on which of the land and the groove is irradiated with the light beam. 18. The optical disc recording method according to claim 17, wherein data having a density lower than that of the groove is recorded on the land. 19. An optical disc reproducing method for irradiating an optical disc having a land and a groove with a light beam to reproduce data recorded on the optical disc, wherein the data is recorded on either the land or the groove. If the data recording densities are different, the optical disc reproducing method includes a step of combining data having different transfer rates reproduced from the land and the groove. 20. An optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce the data recorded on the optical disk, wherein the data recording density of the land is the data recording density of the groove. Optical disc reproduction method comprising combining data having different transfer rates reproduced from the land and the groove, if lower. 21. The optical disc recording method according to claim 16, further comprising the step of recording data by different modulation methods depending on which of the land and the groove is irradiated with the light beam. 22. The optical disk recording method according to claim 21, wherein data is recorded on the land by a modulation method having a density ratio lower than that of the groove. 23. An optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, wherein the data is recorded on either the land or the groove. If the modulation method is different depending on whether the data is reproduced, an optical disk reproducing method including a step of demodulating by a different method depending on whether the data is reproduced from the land or the groove. 24. An optical disc reproducing method for irradiating an optical disc having a land and a groove with a light beam to reproduce data recorded on the optical disc, wherein a density ratio of a modulation method of the land is a modulation of the groove. An optical disk reproducing method including a step of demodulating by a different method depending on whether the data is reproduced from the land or the groove when the density ratio is lower than that of the method. 25. An optical disk reproducing method for irradiating an optical disk having a land and a groove with a light beam to reproduce data recorded on the optical disk, wherein the data is recorded on either the land or the groove. An optical disc reproducing method including the step of equalizing reproduced data with different frequency characteristics depending on whether the data is reproduced. 26. The optical disc reproducing method according to claim 25, wherein a high frequency component of data reproduced from the land is amplified by a gain larger than a high frequency component of data reproduced from the groove. 27. An optical disk reproducing apparatus for irradiating an optical disk having a land and a groove with a light beam to reproduce the data recorded on the optical disk, wherein the data is recorded on either the land or the groove. An optical disk reproducing apparatus including means for equalizing reproduced data according to different frequency characteristics depending on whether the data is reproduced. 28. The optical disk reproducing apparatus according to claim 27, wherein the high frequency component of the data reproduced from the land is amplified by a gain larger than that of the high frequency component of the data reproduced from the groove.