JP2001297436A - Information recording method, information recorder and information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording method capable of recording in uniform signal characteristics over the whole area of an optical disk medium by using a simple driving method of Constant Angular Velocity while maintaining compatibility with the recording formats of conventional reproduction dedicated media. SOLUTION: In rotary drive by a constant angular velocity mode, the front edge position of a head heating pulse, the back edge position of a tail end heating pulse, and each set value of a recording power Pw are updated at a prescribed interval according to a desired recording linear velocity so as to change together a ratio Ttop with respect to the recording clock period T of the pulse width of a head heating pulse, a ratio Ttail with respect to the recording clock period T of the pulse width of a tail end heating pulse, and the ratio ρ (=Pw/Pwmin) with a recording power Pwmin in the innermost peripheral position of a recording power Pw. Thereby, recording with a uniform characteristic is attained over the whole area crossing from the innermost peripheral position to the outermost peripheral position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video DVD (D
digital Video or Versatile Disk) or DVD-RO
DVD-R (Recodable) or DVD-
The present invention relates to an information recording method, an information recording device, and an information processing device using this device on an optical disc medium such as an RW (ReWritable) disc.

[0002]

2. Description of the Related Art With the spread of multimedia, video D
Read-only media such as VD and DVD-ROM, and information recording media such as write-once DVD-R using a dye material as a recording layer and rewritable DVD-RW using a phase change material have been developed. .

Information (sectors in this example) recorded on these DVD media has a format as shown in FIG. In such a format,
As shown in FIG. 12D, data (sectors) are continuously recorded at a constant linear density on all tracks of the medium.

In order to provide an information recording medium having a format compatible with the read-only medium, a method of controlling the rotation speed of the information recording medium (media) has conventionally been used as shown in FIG.
As shown in (b), CLV (Constant Linear Velocit)
y: constant linear velocity) method, controlling the rotational speed of the media so that the rotational speed becomes inversely proportional to the track radius, and keeping the linear velocity of the track constant while maintaining the information at a constant recording channel clock frequency. We are recording.

However, in order to control the rotational speed by the CLV method, it is necessary to change the rotational speed of the medium in order to keep the track linear velocity constant. That is, since the rotation of the spindle motor for rotating the medium is accompanied, a large rotation torque is required, and a large-sized and high-cost motor is required. Also, at the time of seeking, it takes a long time to complete the shifting of the spindle motor, so compared to HDDs and MO drives,
There is a disadvantage that it takes a lot of access time.

In view of the above, in order to perform recording on the medium while keeping the rotation speed of the medium constant without performing speed change control, the format of information recorded on the medium is as shown in FIG. It is also considered. That is, as shown in FIG. 13C, the frequency of the channel clock to be recorded on the medium is made smaller on the inner circumference side and increased on the outer circumference side in proportion to the radial position of the track. In this case, since the recording linear velocity becomes smaller on the inner peripheral side and increases on the outer peripheral side, the recording linear density is constant as shown in FIG. Further, it is possible to record information on the medium by keeping the number of rotations (rotation speed) of the medium constant as shown in FIG. 13B, that is, by using a CAV (Constant Angular Velocity) method.

[0007] This eliminates the need for rotational speed change control of the spindle motor that rotationally drives the medium.
A low-rotation torque is sufficient, and a small and low-cost motor can be used. Further, since no shift is performed, a shift waiting time during seeking is not required, and the access time can be greatly reduced.

However, dye-based DVD-Rs in which pits (marks) are generally formed in a heat mode
Media and phase-change type RW media optimize the pulse width and recording power of a recording pulse train generated by laser emission at the time of recording at a specific recording linear velocity, and the state of marks and spaces formed at different recording linear velocities is reduced. Change. In other words, a shortage of heat capacity occurs due to the first heating pulse necessary for forming a mark, the heating temperature reached with respect to the optimum decomposition temperature varies, the average length of the mark varies, and the pulse width of the optimum last pulse increases. Therefore, a uniform mark width cannot be obtained, and a thicker or thinner (a so-called tear-shaped mark) occurs depending on the mark length, thereby deteriorating jitter characteristics.

In this respect, for example, according to Japanese Patent Application Laid-Open No. 5-225570, at least two test recording areas are required in order to determine the optimum recording light amount corresponding to the entire recordable area of each optical disc in a relatively short time. The optimum recording light amount is obtained at a recording linear velocity equal to the position, and the optimum recording light amount is obtained by an interpolation routine.
By performing an interpolation process or an extrapolation process on the optimum recording light quantity at one recording linear velocity, the optimum recording light quantity at all the recording linear velocities is obtained.

According to Japanese Patent Application Laid-Open No. Hei 5-274678, in order to reduce the laser power required for recording without deteriorating the jitter characteristics, the optical disk is rotated at a constant number of rotations, and is different depending on the area. In a method of recording information at a higher frequency in an outer peripheral region than in an inner peripheral region by irradiating a light beam intensity-modulated according to an information signal based on a reference clock, the light beam is referred to in each region. A light beam that periodically emits pulses at a frequency that is an integral multiple of the clock frequency, and
When the light beam is applied to the outer peripheral region, the duty ratio of the pulse emission is set to be larger than when the light beam is applied to the inner peripheral region.

According to Japanese Patent Application Laid-Open No. 10-106008, an optical disk, an optical head, a synchronizing signal generation means, a VCO, a phase comparison means, A controller and a recording signal generating means are provided, and by changing the pulse height and width of the recording signal in accordance with the recording linear velocity, recording can always be performed under the best recording conditions.

[0012]

That is, in the case of these publications, in the CAV system, control is performed such that the set value of any element of the recording pulse such as the duty ratio of pulse emission is varied according to the recording linear velocity. However, these controls have only a qualitative effect on an optical disk medium, and are insufficient particularly on a DVD recording medium. That is, recording information (RF signal) such as jitter characteristics
Because multiple factors interact with each other to change the characteristics of
The recording methods described in these publications are inadequate and cannot always be recorded with uniform signal characteristics over the entire surface of the optical disk medium, and the desired effects cannot always be obtained. Even if the set value of the recording pulse is changed, how to change the set value has not been quantitatively studied.

[0013] Also, when changing each set value of the recording pulse consisting of the first heating pulse and the subsequent heating pulse,
Before and after the setting is changed, the modulation degree and asymmetry of the reproduced signal change, and the slice level for binarization cannot be followed, resulting in deterioration of jitter.

Therefore, the present invention provides a method for recording information using a recording pulse train composed of a head heating pulse and a subsequent heating pulse while driving an optical disk medium, without controlling the rotational speed of the optical disk medium. Further, an information recording method and an information recording apparatus capable of recording with uniform signal characteristics over the entire surface of an optical disk medium using a simple method while maintaining compatibility with a recording format of a conventional read-only medium. The purpose is to provide.

Further, the present invention provides an information recording method and an information recording apparatus in which the variation of the binarization with respect to the slice level is suppressed, the jitter characteristic is prevented from deteriorating, and the PLL of the reproduced clock is also operated stably. With the goal.

Further, according to the present invention, even when recording is performed by CAV control, the edge shift of a mark due to the effect of heat storage is corrected for all recording linear velocities, and recording with low jitter is performed over the entire optical disk medium. An object of the present invention is to provide an information recording method and an information recording device that can be performed.

[0017]

According to a first aspect of the present invention, there is provided an information recording method for recording information on an optical disk medium having a recording layer on which information is recorded by a laser beam having an emission waveform by a recording pulse train composed of a plurality of heating pulses. When performing the recording, the recording clock cycle T is changed in accordance with the change in the recording linear velocity to perform recording so that the recording linear density becomes substantially constant, and the front edge position of the head heating pulse in the recording pulse train; The pulse width and recording power of each heating pulse are changed so that the trailing edge position of the last heating pulse and the recording power of the heating pulse portion are both changed at a substantially constant rate in accordance with the desired recording linear velocity. Each set value is updated at a predetermined interval.

Therefore, the CA for keeping the disk rotation speed constant
Even if the recording linear velocity changes due to the V control, an optimum recording pulse can be set for each recording linear velocity, and uniform characteristics can be recorded over the entire surface of the optical disk medium.

According to a second aspect of the present invention, there is provided an information recording method for recording information on an optical disk medium having a recording layer on which information is recorded by a laser beam having an emission waveform by a recording pulse train composed of a plurality of heating pulses. The recording is performed so that the recording linear density becomes substantially constant by changing the recording clock period T in accordance with the change in speed, and the ratio Ttop of the pulse width of the first heating pulse to the recording clock period T;
All the set values of the ratio Ttail of the pulse width of the last heating pulse to the recording clock cycle T and the recording power Pw of the heating pulse portion are updated so as to increase at predetermined intervals according to the increase in the recording linear velocity. I did it.

Therefore, the CA for keeping the disk rotation speed constant
Even if the recording linear velocity changes due to the V control, an optimum recording pulse can be set for each recording linear velocity, and uniform characteristics can be recorded over the entire surface of the optical disk medium. In particular, since the leading edge position of the first heating pulse and the trailing edge position of the last heating pulse are varied as the pulse width, the control is easy and the processing can be simplified.

According to a third aspect of the present invention, in the information recording method according to the second aspect, the outermost peripheral position of the optical disk medium is set with respect to each set value at the minimum recording linear velocity at the innermost peripheral position of the optical disk medium. And the ratio Ttop of the pulse width of the first heating pulse at the maximum recording linear velocity is in the range of 0.05T to 0.25T as the cumulative increase, and the pulse width of the last heating pulse is Ratio Tta
Each set value is changed in accordance with the increase in the recording linear velocity so that il falls within the range of 0.1T to 0.3T as the cumulative increase.

Therefore, the CA for keeping the disk rotation speed constant
Even if the recording linear velocity changes due to the V control, the optimum pulse width of the recording pulse can be set continuously from the innermost position to the outermost position, and recording with uniform characteristics over the entire surface of the optical disk medium can be performed. It becomes possible.

According to a fourth aspect of the present invention, in the information recording method according to the second aspect, each set value at the minimum recording linear velocity at the innermost peripheral position of the optical disk medium is set at the outermost peripheral position of the optical disk medium. Ratio ρmax = Pwmax / Pwmin of the recording power Pw of the heating pulse portion at the maximum recording linear velocity
However, the set value of the recording power is changed in accordance with the increase in the recording linear velocity so that the cumulative increase falls within the range of 0.3 to 0.6.

Therefore, the CA for keeping the disk rotation speed constant
Even if the recording linear velocity changes due to the V control, the optimum recording power can be continuously set from the innermost position to the outermost position, and recording with uniform characteristics over the entire surface of the optical disk medium becomes possible. .

According to a fifth aspect of the present invention, in the information recording method of the second, third or fourth aspect, when the pulse width of the first heating pulse at the minimum recording linear velocity at the innermost peripheral position of the optical disk medium is set, The pulse width of the first heating pulse with respect to the shortest mark data length (X) T is + 0.02T to +
The front edge position is corrected so as to be longer in the range of 0.06T, and when the space length immediately before the mark to be formed is the shortest length (X) T, the position before the head heating pulse of the mark to be formed is corrected. The edge position is set to -0.02T to -0.0.
It was set to be recorded in the range of 12T and recorded.

Therefore, it is possible to set an optimum recording pulse especially for a dye-based optical disk medium, and the length of the mark and the space becomes almost equal to an integral multiple of the recording clock period over the shortest to the longest data length. It is possible to correct the edge shift of the mark due to the influence of the heat storage depending on the adjacent mark without causing the edge shift depending on the length, and it is possible to perform the recording with the reproduction signal characteristic with low jitter.

The invention according to claim 6 is the invention according to claims 2 to 5
In the information recording method according to any one of the above, when setting the pulse width of the last heating pulse at the minimum recording linear velocity at the innermost peripheral position of the optical disk medium, the space length immediately after the mark to be formed is the shortest. When long (X) T,
The trailing edge position of the last heating pulse of the mark to be formed is set and recorded in the range of -0.02T to -0.12T so that the pulse width of the last heating pulse becomes short. .

Therefore, even when recording is performed on an optical disk medium having different types of dye materials and groove configurations by CAV control in which the disk rotation speed is kept constant, the heat storage that depends on the adjacent mark for all recording linear velocities. The edge shift of the mark due to the influence of the above can be corrected, and recording with low jitter can be performed over the entire surface of the optical disk medium.

[0029] The invention according to claim 7 is the invention according to claims 1 to 6.
In the information recording method according to any one of the above, a difference in asymmetry between the longest data and the shortest data of the recorded information to be reproduced is within 10% before and after updating any set value of the recording pulse. , The amount of change of each set value or the update interval is set.

Therefore, it is possible to suppress the fluctuation of the binarization with respect to the slice level, to perform recording without deteriorating the jitter characteristic and to improve the stability of the PLL of the reproduction clock.

The invention described in claim 8 is the first invention to the seventh invention.
In the information recording method according to any one of the above, based on the optimum setting value for each of a plurality of recording linear velocities of the setting value of the recording pulse pre-formatted on the optical disk medium,
The amount of change or the gradient of the set value of the recording pulse to be updated at the predetermined interval is calculated.

Therefore, the set value of the recording pulse can be updated in accordance with the recording linear velocity by a simple method, and recording can be performed with uniform characteristics over the entire surface of the optical disk medium at a necessary and sufficient update interval. It becomes possible.

The ninth aspect of the present invention provides the first to seventh aspects.
In the information recording method according to any one of the above, based on the optimum setting value for each of a plurality of recording linear velocities of the setting value of the recording pulse included in the disk information recorded earlier in the predetermined area, The change amount or the gradient of the set value of the recording pulse to be updated at intervals of is calculated.

Therefore, the set value of the recording pulse can be updated in accordance with the recording linear velocity by a simple method, and recording can be performed with uniform characteristics over the entire surface of the optical disk medium at a necessary and sufficient update interval. It becomes possible.

According to a tenth aspect of the present invention, in the information recording method according to any one of the first to seventh aspects, an optimum value of the set value of the recording pulse stored in the information recording device in advance for each of a plurality of recording linear velocities is provided. On the basis of the set value, the change amount or the gradient of the set value of the recording pulse to be updated at the predetermined interval is calculated.

Therefore, the set value of the recording pulse can be updated in accordance with the recording linear velocity by a simple method, and recording can be performed with uniform characteristics over the entire surface of the optical disk medium at a necessary and sufficient update interval. It becomes possible.

According to an eleventh aspect of the present invention, in the information recording method according to any one of the first to tenth aspects, address information preformatted on the optical disk medium is detected and updated at the predetermined interval. The set value of the recording pulse corresponding to the address information is calculated from the change amount or the gradient, and the predetermined interval is associated with the range of the address information, so that the set value of the recording pulse according to the address information is calculated. Was calculated.

Therefore, even during recording, it is possible to easily recognize the update of the set value without deviating from the optimum set value of the recording pulse. Therefore, it is possible to update the set value of the recording pulse in the CAV method in which the disk rotation speed is constant, with high accuracy.

According to a twelfth aspect of the present invention, when recording on an optical disk medium having a recording layer on which information is recorded by a laser beam having a light emission waveform by a recording pulse train composed of a plurality of heating pulses, the recording linear velocity changes. An information recording apparatus that performs recording by changing the recording clock cycle T in accordance with the recording linear density so that the recording linear density becomes substantially constant, wherein the pulse width of the first heating pulse, the pulse width of the last heating pulse, The set value of the leading edge position of the first heating pulse, the trailing edge position of the last heating pulse, and the set value of the recording power are changed according to a desired recording linear velocity so that the recording power of the heating pulse portion is changed together. The pulse width and the recording power of the first and last heating pulses corresponding to the detected address information of the optical disk medium are calculated at regular intervals. A controller that changes a leading edge position of the leading heating pulse and a trailing edge position of the trailing heating pulse according to a pulse width of the leading and trailing heating pulses calculated according to the detected address information. A pulse width varying unit; and a driver circuit for updating the amount of light emitted from the laser light source at any time according to the recording power of the heating pulse portion calculated according to the detected address information.

Therefore, the CA for keeping the disk rotation speed constant
Even if the recording linear velocity changes due to the V control, an optimum recording pulse can be set for each recording linear velocity, and uniform characteristics can be recorded over the entire surface of the optical disk medium.

According to a thirteenth aspect of the present invention, when recording on an optical disk medium having a recording layer on which information is recorded by a laser beam having a light emission waveform by a recording pulse composed of a head heating pulse and a subsequent heating pulse, An information recording apparatus for performing recording by changing a recording clock cycle T in accordance with a change in a linear velocity so that a recording linear density becomes substantially constant, wherein the pulse width of the head heating pulse with respect to the recording clock cycle T The ratio Ttop, the ratio Ttail of the pulse width of the last heating pulse to the recording clock cycle T, and the recording power Pw of the heating pulse portion are both changed.
The set values of the leading edge position of the leading heating pulse, the trailing edge position of the trailing end heating pulse, and the recording power of the heating pulse portion are updated as needed at predetermined intervals according to a desired recording linear velocity, and are detected. A controller for calculating the leading edge position of the leading heating pulse, the trailing edge position of the trailing heating pulse, and the recording power of the heating pulse portion corresponding to the address information, and the leading edge position of the leading heating pulse in the recording pulse. , A multi-stage edge signal generation circuit that outputs a front edge signal for changing the edge signal and a rear edge signal for changing the rear edge position of the rearmost heating pulse; From the edge signal and the rear edge signal, the leading edge of the leading heating pulse corresponding to at least the detected address information A selector for selecting a leading edge signal corresponding to the position and a trailing edge signal corresponding to the trailing edge position of the last heating pulse; and the laser light source according to the recording power of the heating pulse portion corresponding to the detected address information. A driver circuit that updates the amount of emitted light as needed.

Therefore, the CA for keeping the disk rotation speed constant
Even if the recording linear velocity changes due to the V control, an optimum recording pulse can be set for each recording linear velocity, and uniform characteristics can be recorded over the entire surface of the optical disk medium. In particular, recording with CAV control is possible with a simple and small circuit configuration.

According to a fourteenth aspect of the present invention, there is provided an information processing apparatus comprising:
An information recording device according to claim 12 or 13 is built in.

Therefore, since the information recording apparatus according to the twelfth or thirteenth aspect is built in, a recording pulse train composed of a plurality of heating pulses including a first heating pulse and a last heating pulse is used while rotating the optical disk medium. When recording information by using the optical disk medium, uniform signal characteristics are recorded over the entire surface of the optical disk medium without controlling the rotation speed of the optical disk medium and maintaining compatibility with the recording format of conventional read-only media. It can be effectively used as a storage device for information.

[0045]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. First, as a setting of a basic recording pulse train used in a dye-based optical disk as an optical disk medium, as shown in FIG. 1, a recording pulse for each mark data length nT is a subsequent heating pulse including a first heating pulse and a last heating pulse. It is composed of pulses.

As a basic setting of the recording pulse train, the number of pulses nx (x is 1 or 2) constituting the recording pulse train for each mark data length nT and the pulse width of the head heating pulse with respect to the recording clock cycle T are set. There are a ratio Ttop, a duty ratio Tmp of a heating pulse of a subsequent intermediate multi-pulse portion, a ratio Ttail of a pulse width of a last heating pulse to a recording clock cycle T, and the like. The setting of the recording power includes a recording power Pw for a heating pulse portion for forming a mark, and a bias power Pb for forming a cooling pulse portion and a space in the mark. Regarding the recording power, the state of mark formation is determined by the recording linear velocity Lv.
It is well known that the optimum value of the recording power increases as the recording linear velocity increases because of the strong correlation.
Here, the ratio ρ = Pw / P of the recording power Pw at any desired radial position (recording linear velocity) to the innermost peripheral position, that is, the optimum recording power Pwmin at the minimum recording linear velocity.
Set wmin. In the present embodiment, among these set values, more detailed settings are made for the ratio Ttop of the pulse width of the first heating pulse, the ratio Ttail of the pulse width of the last heating pulse, and the ratio ρ of the recording power Pw. Is what you do.

In the present embodiment, in addition to the above, the leading edge position of the first heating pulse and the trailing edge position of the last heating pulse according to the length of the mark data to be recorded and the space length immediately before and after are further improved. Make detailed settings.

When recording control is performed on a dye-based DVD disk having a diameter of 120 mm by the CAV method, the recording linear velocity is about 3.5 m / s at the innermost position of the disk and about 8.5 m / s at the outermost position. s, and the recording clock frequency is about 26.2 MHz at the innermost position of the disk and about 63.7 MHz at the outermost position. When such a recording requiring a change in recording linear velocity of about 2.4 times is performed on a dye-based DVD disk, using the same pulse width and recording power set value of the same recording pulse train over the entire area will result in high values. As the recording linear velocity becomes higher (as it becomes closer to the outer circumference), excess or deficiency occurs in the preliminary heating by the first heating pulse, so that the modulation degree of the RF signal varies, and the symmetry (asymmetry) of the RF signal varies. In addition, the optimum value of the pulse width of the last heating pulse in the subsequent multi-pulse portion also deviates, and the recording mark width becomes non-uniform. In the present embodiment,
As described below, the optical disc medium has a uniform signal characteristic from the innermost position to the outermost position of the optical disk medium and enables recording with low jitter.

First, as shown in FIG. 2, at the minimum recording linear velocity at the innermost position, the number of heating pulses constituting the recording pulse train is n-1 (n is the mark data length), and the pulse width of the first heating pulse is The ratio Ttop is 1.30 T, the pulse width ratio Tmp of the subsequent intermediate multi-pulse is 0.65 T,
The ratio Ttail of the pulse width of the tail heating pulse is 0.67T,
The optimum recording power Pwmin of the heating pulse is set to 9.0 mW. These setting values are typical numerical values of a dye-based recording disk, and are different optimum values depending on various tunings and types of recording materials.

Then, as shown in FIG. 2, the set values of the ratios Ttop and Ttail and the ratio ρ = Pw / Pwmin between the recording power Pw and the optimum recording power Pwmin are calculated according to the increase in the recording linear velocity.
By changing each of them to increase, it becomes possible to add an optimal amount of heat to the beginning and end of the mark and to perform recording with an optimal recording power, so that the mark width can be formed uniformly. And good jitter characteristics can be maintained.

As described above, when recording is performed by the CAV method in which the recording linear velocity changes depending on the radial position, good recording can be performed by updating these set values as follows. That is, as a specific setting example, FIG.
As shown in the figure, the ratio Ttop of the pulse width of the first heating pulse to the recording clock cycle T is set to 1.30 at the innermost peripheral position.
1.45T at outermost position from T (≒ 49.7ns)
(≒ 22.8 ns), and the accumulated increment is set to 0.
The set value is updated and changed so as to be 15T longer.

Further, the ratio Ttail of the pulse width of the last heating pulse to the recording clock cycle T is from 0.67T (≒ 33.3 ns) at the innermost position to 0.1% at the outermost position.
The setting value is changed to 85T (≒ 19.3 ns), and the set value is updated and changed so that the accumulated value increases by 0.17T. The trailing edge of the head heating pulse and the trailing edge of the middle multi-pulse portion are set to be always synchronized with the recording clock.

Next, regarding the setting of the recording power, the recording power Pw at a desired arbitrary radial position (recording linear velocity) with respect to the innermost circumferential position, that is, the optimum recording power Pwmin of the heating pulse at the minimum recording linear velocity, is set. Ratio ρ = Pw / P
In accordance with the increase in the recording linear velocity, wmin is increased from 1.0 to 1.50, that is, 0.50 in the cumulative increment.
Alternatively, the set value is updated and changed according to the radius position.

When the recording pulses at the innermost position and the outermost position thus set are compared with each other along the time axis, a light emission waveform as shown in FIG. 5 is obtained.
FIG. 5 illustrates the case of 7T mark data as a representative example of data.

That is, in the present embodiment, three ratios Tto
The setting values of the leading edge position of the first heating pulse, the trailing edge position of the last heating pulse, and the recording power Pw thereof are updated according to the recording linear velocity so that p, Ttail, and ε are changed together. More specifically, as shown by the vectors A and B in FIG. 5 (arrows A and B), this corresponds to the minimum pulse width of the first heating pulse, its recording power, and the last heating pulse. This means that the pulse width and the recording power are both changed according to the recording linear velocity, and the pulse shape is updated. Further, as can be seen from the vectors A and B (arrows A and B), the rate and direction in which the pulse width is changed are different.

Incidentally, the present invention is not limited to the change between the leading edge position of the first heating pulse and the trailing edge position of the last heating pulse.
The rear edge position of the first heating pulse may be changed, the front edge position of the last heating pulse may be changed, or the front and rear edge positions of an intermediate multi-pulse may be changed, but as in the present embodiment. According to the method in which these edge positions are fixed with respect to the recording clock and the front edge position of the first heating pulse and the rear edge position of the last heating pulse are changed, control is easy and processing is simplified. obtain.

More specifically, the above-mentioned ratio ρmax is obtained when Pwmin = 9.0 mW is calculated as the optimum recording power by trial writing (OPC) at the minimum recording linear velocity at the innermost peripheral position. = 1.50, the optimum recording power Pwmax at the outermost peripheral position becomes 13.
It is changed to 6 mW.

By using such a recording power setting method, even if the optical disc medium has a different recording sensitivity, the recording power ratio ρ can be changed from the optimum recording power setting value at the innermost position to the ratio ρmax. By setting while updating, the optimum set value can be easily obtained over the entire surface of the optical disc medium, and uniform recording with good jitter characteristics can be performed.

In a DVD, EFM is used as recording data.
A modulation method called a pulse is used, and the shortest data length is 3T and the longest data length is 14T. When the mark data length to be recorded is recorded with the set value as described above, a phenomenon that the front and rear edges of the mark are shifted due to the heat storage action depending on the mark data length is likely to occur. In this edge shift, the mark data length is equal to the light spot diameter (1 /
becomes remarkable when e ²⁾ small relative to the recording data length occurs the maximum edge shift in the case of 3T.

When a dye material is used for the recording layer, the thermal interference between adjacent marks differs depending on the space length immediately before and immediately after the mark to be recorded, and the edge position before and after the mark shifts. This phenomenon is the shortest space length 3
In the case of T, the maximum edge shift occurs.

Therefore, in this embodiment, the edges before and after the recording pulse are corrected so that all the recorded mark lengths and formed space lengths become an integral multiple of the recording clock cycle with high accuracy. Like that.

More specifically, as shown in FIG. 6, at the minimum recording linear velocity (the innermost circumferential position), the head heating pulse is formed with respect to the set value 1.30T of the pulse width of the above-mentioned head heating pulse. The space length immediately before the mark is 4T to 14T, and
When the mark length is the shortest 3T data, the front edge position of the first heating pulse is corrected to be 1.33T by increasing the pulse width of the first heating pulse by + 0.03T,
When the space length immediately before the mark to be formed is the shortest length 3T and the mark length is 4T to 14T data, the leading edge position of the head heating pulse is set so that the pulse width of the head heating pulse is shortened by -0.05T. This is corrected to 1.25T.

At the maximum recording linear velocity (outermost peripheral position), the set value of the pulse width of the above-described head heating pulse is 1.
For 45T, when the space length immediately before the mark to be formed is 4T to 14T and the mark length is the shortest 3T data, the leading edge position of the head heating pulse is similarly set to +0.0
It is corrected so that the pulse width of the first heating pulse is increased by 3T to 1.48T, the space length immediately before the mark to be formed is the shortest 3T, and the mark length is 4T to 4T.
In the case of 14T data, the leading edge position of the first heating pulse is corrected to be 1.38T so that the pulse width of the first heating pulse becomes shorter by -0.07T.

Although the correction of the leading edge position of the head heating pulse varies depending on the type of dye-based recording disk, according to the method of the present embodiment, the combination of the immediately preceding space length sT and the mark length mT to be recorded is used. (ST, mT)
Are (3T, 3T), (3T, 4T), (3T, 5T ~
14T), (4T, 3T), (4T, 4T), (5T ~
14T, 3T), (5T-14T, 4T), (5T-1
By correcting eight types (4T, 5T to 14T), a sufficient edge shift reduction effect can be obtained.

Next, at the minimum recording linear velocity (the innermost peripheral position), the space length immediately after the mark to be formed is the shortest with respect to the above-mentioned pulse width setting value 0.67T of the last heating pulse. When the mark length is 3T and the mark length is 4T to 14T data, the rear edge position of the last heating pulse is set to -0.0.
It is corrected to 0.65T so that the pulse width of the last heating pulse is shortened by 2T.

Further, at the maximum recording linear velocity (outermost peripheral position), the space length immediately after the mark to be formed is 3T, which is the shortest, with respect to the above-mentioned pulse width setting value 0.85T of the last heating pulse. When the mark length is 4T to 14T data, the rear edge position of the last heating pulse is set to -0.0.
The correction is made to be 0.82T so that the pulse width of the last heating pulse becomes shorter by 3T.

The correction of the trailing edge position of the last heating pulse differs depending on the type of the dye-based recording disk. However, according to the method of this embodiment, the space length sT immediately after the recording and the mark length mT to be recorded are determined. Combination (sT, m
T) is (3T, 3T), (3T, 4T), (3T, 5
By correcting the four types of (T-14T) and (4T-14T, 4T-14T), a sufficient edge shift reduction effect can be obtained.

As described above, by correcting the leading and trailing edge positions of the recording pulse according to the mark data length to be recorded,
The mark length-dependent edge shift can be prevented, and the jitter characteristics can be recorded satisfactorily.

The correction for the space length immediately after the pulse width of the last heating pulse can be performed with low jitter over the entire surface of the recording disk even if the same correction amount is used for the change in the recording linear velocity. It becomes possible. However, needless to say, by optimizing the correction amount at each recording linear velocity or optimizing the correction amount for each combination of the space length and the mark length immediately afterward, it is possible to perform recording with lower jitter.

Table 1 shows the set values of the first heating pulse and the last heating pulse adapted to the correction of the front and rear edge positions.

[0071]

[Table 1]

As described above, all the set values of the pulse width and the recording power (the set values of the ratio Ttop, the ratio Ttail, the ratio ρ, and the Pw) are updated and changed so as to be increased toward the outer periphery of the disk. By doing so, the reproduced RF signal has a 14T modulation degree (Modulation) or a 3T modulation degree (Reso
lution) and a change in asymmetry are small, and the increase in jitter is small, so that good recording is possible.

The above set values are typical values for a disk having a specific dye material and groove configuration. However, dye-based recording disks generate optical changes due to thermal decomposition due to laser beam irradiation and accompanying substrate deformation, and information is recorded by forming marks based on the changes. When a mark is formed by such a heat mode, the present embodiment is well suited.
Examples of typical organic dyes include polymethine dyes, cyanine-based, naphthalocyanine-based, phthalocyanine-based, squarylium-based, pyrylium-based, naphthoquinone-based, anthraquinone-based (indanthrene-based), xanthene-based, triphenylmethane-based, and azulene-based. And phenanthrene-based, triphenothiazine-based dyes and azo-based metal complex compounds. These dyes have optical properties, recording sensitivity,
It may be used by mixing or laminating it with another organic dye, a metal, or a metal compound for the purpose of improving signal characteristics and the like. Examples of metals and metal compounds include In, Te, Bi, Se,
Sb, Ge, Sn, Al, Be, TeO ₂ , SnO, A
s, Cd, etc., each of which can be used in the form of dispersion mixing or lamination. The recording layer can be formed by ordinary means such as vapor deposition, sputtering, CVD, or solvent application. When the coating method is used, the above dye or the like can be dissolved in an organic solvent, and the coating can be performed by a conventional coating method such as spraying, roller coating, dipping and spin coating.

In these various dye-based recording disks, the optimum set values are different. However, when performing recording by the CAV method, any of the set values of the pulse width and the recording power (the set values of the ratio Ttop, the ratio Ttail, the ratio ρ, and Pw) of the first heating unit and the subsequent heating unit are not limited. The recording disk can be adapted to the recording linear velocity Lv by similar optimization.

In the example described above, the optimum set value of the recording pulse is shown in the optical disk medium of a general azo dye material. As a result of examining the setting of the recording pulse in detail in an optical disk medium having other typical configurations, the increment of each set value at the outermost position with respect to the innermost position is determined by the recording clock period T of the pulse width of the first heating pulse. Is 0.
It was in the range of 05T to 0.25T, and the ratio Ttail of the pulse width of the last heating pulse was in the range of 0.10T to 0.30T. Further, when such a recording pulse is set, the ratio ρmax = Pwmax / of the recording power Pw of the heating pulse portion at the maximum recording linear velocity at the outermost peripheral position.
The cumulative increase of Pwmin was good in the range of 0.4 to 0.6. By setting such a range, it is possible to perform satisfactory recording on a large number of optical disk media having different recording pulse set values and recording sensitivities (heating power).

Next, regarding the pulse width of the head heating pulse, the pulse width for the shortest mark data length 3T is +0.
When the leading edge position is corrected so as to be longer in the range of 02T to + 0.06T, and the space length immediately before the mark to be formed is the shortest 3T data, the leading edge position of the leading heating pulse is set to- Correction is made to be shorter in the range of 0.02 to -0.12T. Regarding the pulse width of the last heating pulse, when the space length immediately after the mark to be formed is the shortest length 3T, the rear edge position of the last heating pulse of the mark to be formed is determined by the position of the last heating pulse. -0.02T to -0.12 so that the pulse width becomes shorter
Correct within the range of T. By setting such a range, as described above, the influence of thermal interference between adjacent marks differs depending on the dye material, so that good recording can be performed on a large number of optical disk media having different correction amounts. there were.

Hereinafter, each set value will be described in more detail. Generally, when recording is performed on a dye-based recording disk at different recording linear velocities, it is known that the recording power is substantially proportional to the square root of the recording linear velocity (for example, Japanese Patent Application Laid-Open No. H10-106008 described above). reference). That is,
If the recording power is Pw, the recording linear velocity is Lv, and the constant is Klv, the recording power is calculated as Pw = Klv√Lv. However, as described above, the ratio Ttop of the pulse width of the first heating pulse to the recording clock cycle T, the ratio Ttail of the pulse width of the last heating pulse to the recording clock cycle T, and the innermost position of the recording power Pw of the heating pulse portion. Ratio of the recording power Pw at the maximum recording linear velocity at the outermost peripheral position to the minimum recording linear velocity at ρmax = Pwmax / Pw
In the case where all the set values including min are optimized according to the recording linear velocity Lv, if the above-mentioned recording power ratio is ρ and the constant Kpw, the optimum value at the minimum and maximum recording linear velocity is obtained. As for the recording power, the recording power calculated by linear approximation by ρ = Klv × Lv + Kpw shows an appropriate value with respect to the recording linear velocity in the entire region. Also, the ratio Tto
Similarly, by using the set values calculated by linear approximation for p and the ratio Ttail, it is possible to obtain optimum set values for the recording linear velocity over the entire area. In the set values of this embodiment, Ttop = 0.030 × Lv + 1.195 Ttail = 0.036 × Lv + 0.544 Pw = Pwmin × ρ = Pwmin × (0.100 × Lv + 0.
650) is used. In addition to the function of the recording linear velocity, the setting of the recording pulse may be updated as a function of the radial position. Therefore, by using the setting method of updating the set value, it is possible to calculate the optimum set value for an arbitrary recording linear velocity by a simple calculation.

In response to the increase in the recording linear velocity Lv,
As an interval for updating each set value, in the characteristic of the RF signal,
It is desirable to make the steps as small as possible, but the load on the controller increases. However, a difference in asymmetry between the longest data and the shortest data of the RF signal before and after updating the setting value has a great influence on an error rate of reproduced information and the like. Here, asymmetry is a value obtained by normalizing the difference between the average level of the longest data amplitude and the average level of the shortest data amplitude of the RF signal with the longest data amplitude as shown in FIG. Shows sex. In the case of EFM pulse modulation, the 14T space level is I _14H , the 14T mark level is I _14L , 3T
_Assuming that the space level is I _3H and the 3T mark level is I _3L , asymmetry = [(I _14H + I _14L ) / 2− (I _3H +
I _3L) / 2] / become (I _14H -I _{1 4L).}

As shown in FIGS. 7 and 8, the difference in asymmetry before and after the update of the set value is ± 10%.
In the vicinity, the jitter characteristic rapidly deteriorates. Therefore,
The difference in asymmetry must be within ± 10%.
In addition, a slice circuit for binarizing an RF signal of a general DVD reproducing apparatus does not have a time constant that follows this difference in asymmetry, so that accurate binarization cannot be performed, and a large edge occurs in the RF signal. A shift occurs. In some cases, the PLL for generating the reproduced clock may be disconnected. According to a more detailed consideration, the jitter characteristic and PL
In consideration of the L stability, it is desirable to update the above set values so that the difference in asymmetry is within ± 5%.

The above four set values (the pulse width ratio Ttop of the first heating pulse, the pulse width ratio Ttail of the last heating pulse, the recording power ratio ρmax with respect to the inner and outer circumferences, and the set values of the recording power Pw) are respectively Although some effects can be recognized even when used alone, fluctuations in the characteristics of the RF signal have an interaction, so it is desirable to set while updating all four set values.

As described above, it is necessary to determine the interval for updating the set value in consideration of the difference in asymmetry. In this embodiment, the ratio Tto of the pulse width of the first heating pulse
Each of p, the pulse width ratio Ttail of the last heating pulse, and the set value of the recording power ratio ρmax with respect to the inner and outer circumferences is updated stepwise as a step of about 0.35 m / s in the width of the recording linear velocity ( 3 and 4). Although this interval has a considerably large width, it is possible to sufficiently suppress the difference in asymmetry. However, the jitter characteristic also deteriorates due to the deviation of these set values, and therefore it is desirable to frequently update the settings at smaller intervals. Further, in addition to updating the recording linear velocity at a constant width, the recording linear velocity may be updated stepwise at a minimum resolution step in a pulse edge generation circuit such as a multi-stage delay circuit described later.

A second embodiment of the present invention will be described with reference to FIG. Generally, a recording disk such as a CD or a DVD is formed with a groove for obtaining a tracking error signal (push-pull signal), and a wobble signal obtained by meandering the groove is superimposed. At a recording linear velocity of, the information encoded by frequency modulation or phase modulation is detected by a programmable BPF and demodulated so that address information and disc information unique to the disc can be obtained even for an unrecorded disc. ing. It is also known that such information is generated by a cut-off intermittent pit (Land-PrePit signal) in the land portion.

Such disk information includes recommended recording pulses at a plurality of recording linear velocities such as a minimum (innermost) recording linear velocity, a maximum (outermost) recording linear velocity, and an intermediate (middle) recording linear velocity. Ratio Ttop of the pulse width of the first heating pulse and the subsequent heating pulse to the recording clock cycle T
And the ratio Ttail, and set values such as the recommended recording power Pw or the recording power ratio ρmax (the ratio of the recording power at the inner and outer circumferences ρ) are embedded in advance. In the present embodiment,
By reading these recommended setting values from the medium and setting them again in the information recording device (step S1), after obtaining the optimum setting values for the inner and outer peripheries, the recording linear velocity Is calculated (S2).

Note that the amount of change and the gradient may be calculated in accordance with the characteristics of the optical disk medium, and can be calculated with high accuracy by linear approximation or other polynomial approximation. Next, C
The update interval of the appropriate set value is calculated from the range of the recording linear velocity in the AV control (S3) (in the present embodiment, every 0.35 m / s, as in the above-described embodiment). ).

The amount of change in the set value obtained in this way is relative to the recording linear velocity, and in fact, it is necessary to recognize it by address information obtained by demodulating the above-described wobble signal or PLL signal. A specific address is determined from the innermost position to the outermost position, and can be associated with the recording linear velocity. Next, by assigning an interval for updating the set value and a range of addresses corresponding to the interval (S4), the set value can be updated when the address to be updated is reached (S5). During recording by the actual CAV control, the current address is read (S
6) It is determined whether the set value is within the range of updating, that is, within the address range (S7). If the set value is out of the range, the set value is updated to the newly calculated set value (S4, S5). Recording can be performed continuously. If it is within the address range, recording is performed by CAV control as described above (S
8) The same process is repeated until the recording end address is reached (S9). With such a configuration, it is possible to greatly reduce the burden of controlling the recording pulse by the controller.

The recording power Pwm at the minimum recording linear velocity
in and the recording power Pwmax at the maximum recording linear velocity are at least 2 including the minimum and maximum recording linear velocities using one or both of the test writing areas arranged at the innermost peripheral position and the outermost peripheral position.
It is also possible to perform more accurate setting by obtaining an optimum value by trial writing (OPC) at various recording linear velocities, or by replacing or correcting recording power information obtained from a wobble signal. is there.

A third embodiment of the present invention will be described with reference to FIG. In this embodiment, the information recording method described above (the ratio Ttop relating to the pulse width of the first heating pulse, the ratio Ttail relating to the pulse width of the last heating pulse, and the recording power P
update setting of the ratio ρmax of the innermost and outermost circumferences of w) to an information recording apparatus for recording on an optical disk medium.

First, an optical disc medium 1 is provided with a rotation mechanism 3 including a spindle motor 2 for driving the optical disc medium 1 to rotate, and an objective lens for condensing and irradiating the optical disc medium 1 with laser light. An optical head 4 having a light source such as a laser and a semiconductor laser is provided so as to be able to move in a seek direction in the disk radial direction. Optical head 4
Servo mechanism 5 for the objective lens driving device and output system
Is connected. A wobble detector 7 including a programmable BPF 6 is connected to the servo mechanism 5.
The wobble detector 7 is connected to an address demodulation circuit 8 for demodulating an address from the detected wobble signal.
The address demodulation circuit 8 includes a PLL synthesizer circuit 9
Is connected. PL
The drive controller 11 is connected to the L synthesizer circuit 9. The drive controller 11 connected to the system controller 12 includes a rotation mechanism 3, a servo mechanism 5, a wobble detection unit 7, and an address demodulation circuit 8.
Is also connected. An EFM encoder 13 and a recording pulse control unit 14 are connected to the system controller 12. The recording pulse control unit 14 includes a recording pulse generation unit 15 that generates a heating multi-pulse control signal including a first heating pulse and a last heating pulse, an edge selector 16 that is a selector described later, and an edge signal generation unit (edge). Signal generating circuit = pulse width varying means) 17. On the output side of the recording pulse control unit 14, the recording power Pw
An LD driver 19, which is a driver circuit for driving the semiconductor laser in the optical head 4 by switching the respective drive current sources 18 of the laser head and the bias power Pb, is connected.

In such a configuration, the center frequency of the BPF corresponding to the recording linear velocity is
And the address demodulation circuit 8 demodulates the address from the wobble signal detected by the wobble detection unit 7 and the PLL synthesizer circuit 9 in which the basic clock frequency is changed by the drive controller 11, and the arbitrary recording linear velocity Is generated and output to the recording pulse control unit 14.

Next, in order to generate a recording pulse by the semiconductor laser, a recording channel clock and EFM data as recording information are input to the recording pulse controller 14 from the recording pulse controller 14 and the EFM encoder 13, respectively.
The recording pulse generator 15 generates a recording pulse control signal for a recording pulse including a first heating pulse, a last heating pulse, and an intermediate heating multi-pulse. Then, the LD driver 19 switches the drive current sources 18 for the recording power Pw and the bias power Pb. At the time of recording, the bias current source constantly emits the semiconductor laser with the bias power Pb corresponding to the reproducing power, and the recording pulse control signal generated by the recording pulse generating unit 15 generates the recording pulse laser as shown in FIG. An emission waveform can be obtained.

Here, in the present embodiment, the leading edge pulse generator 17 of the head heating pulse in the recording pulse generator 15 is used.
A multi-stage delay circuit using a gate element and having a delay amount of about 0.5 ns is arranged, and after being input to an edge selector 16 having a multiplexer configuration, the front edge position can be changed by an edge pulse selected by the system controller 12. A recording pulse control signal (leading edge signal) of the leading heating pulse to be generated is generated. Similarly, in the edge signal generation unit 17 in the recording pulse generation unit 15 that varies the rear edge position of the last heating pulse, a multi-stage delay element using a gate element and having a delay amount of about 0.5 ns is arranged, and the edge selector After being input to 16, a recording pulse control signal (back edge signal) of the last heating pulse is generated by the edge pulse selected by the system controller 12.

With such a configuration, each set value is determined as in the above-described information recording method, an optimum edge pulse is selected at a desired recording linear velocity, and operation is performed so as to generate a desired recording pulse. ing. When the recording pulse generated in such a configuration is updated at predetermined intervals, each set value changes stepwise as shown in FIG. Therefore, when the multi-stage delay element is used, each pulse width becomes a fixed value during the update period, and the pulse width ratio and the duty are set so as to change according to the change of the recording channel clock.

Next, as another embodiment of the present invention, a phase comparator, a loop filter and a VCO (voltage control) are used in place of the multi-stage delay element for the first heating pulse and the last heating pulse in the recording pulse generator 15. Oscillator) and P using divider
A pulse edge generation unit having an LL configuration may be used. In this configuration, a high-resolution clock obtained by multiplying the recording channel clock by 20 is generated by a PLL, and the pulse edge signal has a resolution of 0.05 T, that is, about 1.9 ns to 0.8 ns. After such multi-stage pulse edge signals are input to the edge selector 16 having a multiplexer configuration, a front edge signal that varies the front edge position of the head heating pulse is generated by the edge pulse selected by the system controller 12. Similarly, in the edge pulse generation circuit in the recording pulse generation unit 15 that varies the rear edge position of the last heating pulse, a pulse edge generation unit having a PLL configuration is arranged, and after being input to the edge selector 16, the system controller A trailing edge signal that varies the trailing edge position of the last heating pulse is generated by the edge pulse selected by 12.

With such a configuration, each set value is determined as in the information recording method described above, an optimum edge pulse is selected at a desired recording linear velocity, and operation is performed so as to generate a desired recording pulse. ing. When the recording pulse generated by such a configuration is updated at predetermined intervals, each set value changes to a saw-tooth shape as shown in FIG. Therefore, when the edge pulse generation unit having the PLL configuration is used, the ratio Tto of each pulse width Tto during the update period is used.
p and Ttail are set to be constant values even when the recording clock frequency changes.

It should be noted that the present invention enables uniform recording at the time of CAV recording with any of these configurations.
Various circuit systems can be used as the recording pulse generator.

Therefore, according to the information recording apparatus of this embodiment, the pulse width ratio Ttop of the first heating pulse, the pulse width ratio Ttail of the last heating pulse Ttail, Recording by CAV control using an information recording method involving updating of the set value of the recording power ratio ρ can be performed.

A fourth embodiment of the present invention will be described with reference to FIG. The present embodiment is applied to a personal computer 21 as an information processing apparatus.
In addition to the 5-inch FD drive device 22, the information recording device 23 having the above-described configuration is built in as a DVD-R drive.

According to such a personal computer 21, since the information recording device 23 as described above is built in integrally, the subsequent heating including the first heating pulse and the last heating pulse while rotating the optical disk medium 1 is performed. When recording information using a recording pulse train composed of pulses,
C without controlling the rotation speed of the optical disc medium 1
By using the AV system and maintaining the compatibility with the recording format of the conventional read-only medium, it is possible to record with uniform signal characteristics over the entire surface of the optical disc medium 1, and it is effectively used as an information storage device. Can be used.

[0099]

According to the information recording method of the present invention, even if the recording linear velocity changes due to the CAV control for keeping the disk rotation speed constant, the optimum recording pulse for each recording linear velocity is obtained. Can be set, and uniform characteristics can be recorded over the entire surface of the optical disk medium.

According to the information recording method of the present invention, the optimum recording pulse is set for each recording linear velocity even if the recording linear velocity changes by the CAV control for keeping the disk rotation speed constant. As a result, it is possible to record uniform characteristics over the entire surface of the optical disk medium. In particular, as the variable pulse width, the front edge position of the first heating pulse,
Since the rear edge position of the last heating pulse is varied and the power of the heating pulse is varied as the recording power, the control is easy and the processing can be simplified.

According to the third aspect of the present invention, in the information recording method according to the second aspect, even if the recording linear velocity changes due to the CAV control for keeping the disk rotation speed constant, the innermost position is changed to the outermost position. The optimum pulse width of the recording pulse can be set continuously up to this point, and recording with uniform characteristics can be performed over the entire surface of the optical disk medium.

According to the fourth aspect of the present invention, in the information recording method according to the second aspect, even if the recording linear velocity changes due to the CAV control for keeping the disk rotation speed constant, the innermost position is changed to the outermost position. The optimum recording power can be set continuously up to this point, and recording with uniform characteristics can be performed over the entire surface of the optical disk medium.

According to the fifth aspect of the present invention,
In the information recording method described in 3 or 4, it is possible to set an optimum recording pulse especially for a dye-based optical disk medium, and the length of the mark and the space becomes an integral multiple of the recording clock period over the shortest to the longest data length. The recording becomes almost equal, and recording can be performed with low jitter reproduction signal characteristics without causing a data length-dependent edge shift. Further, the front edge shift of the mark due to the influence of the heat storage depending on the adjacent mark can be corrected for all recording linear velocities, and recording with low jitter can be performed over the entire surface of the optical disk medium.

According to the sixth aspect of the present invention, in the information recording method according to any one of the second to fifth aspects, with respect to optical disk media having different types of dye materials and groove configurations, the disk rotation speed is kept constant. Even when recording is performed by CAV control, it is possible to correct the rear edge shift of the mark due to the influence of heat accumulation depending on the adjacent mark for all recording linear velocities, and it is possible to perform recording with low jitter over the entire optical disk medium. Become.

According to the seventh aspect of the present invention, in the information recording method according to any one of the first to sixth aspects, the difference in asymmetry between the longest data and the shortest data of the recorded information to be reproduced is binary. Therefore, it is possible to perform recording in which fluctuations in the slice level can be suppressed, the jitter characteristics do not deteriorate, and the stability of the PLL of the reproduction clock is improved.

According to an eighth aspect of the present invention, in the information recording method according to any one of the first to seventh aspects, the set value of the recording pulse is updated in accordance with the recording linear velocity by a simple method. It is possible to perform recording with uniform characteristics over the entire surface of the optical disk medium at a necessary and sufficient update interval.

According to the ninth aspect of the present invention, in the information recording method according to any one of the first to seventh aspects, the set value of the recording pulse is updated in accordance with the recording linear velocity by a simple method. It is possible to perform recording with uniform characteristics over the entire surface of the optical disk medium at a necessary and sufficient update interval.

According to the tenth aspect, the first aspect is provided.
In the information recording method according to any one of Items 7 to 7, the set value of the recording pulse can be updated in accordance with the recording linear velocity by a simple method, and the recording pulse can be updated over the entire surface of the optical disk medium at a necessary and sufficient update interval. Recording can be performed with uniform characteristics.

According to the eleventh aspect, the first aspect is provided.
In the information recording method according to any one of Items 1 to 10,
Even during recording, the update of the set value can be easily recognized without deviating from the optimum set value of the write pulse, and the set value of the write pulse in the CAV method in which the disk rotation speed is constant can be accurately determined. Can be updated.

According to the information recording apparatus of the twelfth aspect, even if the recording linear velocity changes by the CAV control for keeping the disk rotation speed constant, an optimum recording pulse is set for each recording linear velocity. As a result, it is possible to record uniform characteristics over the entire surface of the optical disk medium.

According to the information recording apparatus of the thirteenth aspect, even if the recording linear velocity changes by the CAV control for keeping the disk rotation speed constant, the optimum recording pulse is set for each recording linear velocity. It is possible to record uniform characteristics over the entire surface of the optical disk medium.
With a simple and small circuit configuration, recording by CAV control becomes possible.

According to the information processing apparatus of the present invention, since the information recording apparatus according to the twelfth or thirteenth aspect is built in, the first heating pulse and the last heating pulse are generated while rotating the optical disk medium. When recording information using a recording pulse train composed of a subsequent heating pulse including, without controlling the rotation speed of the optical disk medium,
While maintaining compatibility with the recording format of a conventional read-only medium, recording can be performed with uniform signal characteristics over the entire surface of the optical disk medium, and it can be effectively used as an information storage device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a recording pulse train and the like by a first heating pulse and a subsequent heating pulse according to the first embodiment of the present invention.

FIG. 2 is a characteristic diagram of a recording linear velocity versus a pulse width of a recording pulse, a power ratio, and the like.

FIG. 3 is a characteristic diagram showing an example of a method of performing the update.

FIG. 4 is a characteristic diagram showing another example of how to update.

FIG. 5 is a pulse waveform characteristic diagram relatively showing the innermost and outermost recording pulses along the time axis.

FIG. 6 is a pulse waveform characteristic diagram showing an example of correction of a recording pulse according to a space data length and a mark data length immediately before and after.

FIG. 7 is an explanatory diagram for explaining asymmetry according to the first embodiment of the present invention.

FIG. 8 is an asymmetry-jitter characteristic diagram.

FIG. 9 is a flowchart showing a second embodiment of the present invention.

FIG. 10 is a block diagram showing a third embodiment of the present invention.

FIG. 11 is an external perspective view showing a fifth embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a conventional example of the CLV method.

FIG. 13 is an explanatory diagram showing a conventional example of the CAV method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk medium 12 Controller 16 Selector 17 Edge signal generation circuit 19 Driver circuit 23 Information recording device

Claims (14)

[Claims] When recording on an optical disk medium having a recording layer on which information is recorded by a laser beam having a light emission waveform by a recording pulse train composed of a plurality of heating pulses, a recording clock cycle T changes in accordance with a change in a recording linear velocity. Is changed so that recording is performed so that the recording linear density becomes substantially constant, and the front edge position of the first heating pulse in the recording pulse train, the rear edge position of the last heating pulse, and the recording power of the heating pulse portion. An information recording method in which the set values of the pulse width of each heating pulse and the recording power are updated at predetermined intervals so that both are changed at a substantially constant rate in accordance with the desired recording linear velocity. . 2. When recording on an optical disk medium having a recording layer on which information is recorded by a laser beam having a light emission waveform by a recording pulse train composed of a plurality of heating pulses, a recording clock cycle T according to a change in recording linear velocity. Is changed so that the recording linear density becomes substantially constant, and the ratio Ttop of the pulse width of the first heating pulse to the recording clock cycle T, and the recording clock cycle of the pulse width of the last heating pulse. An information recording method in which all set values of a ratio Ttail to T and a recording power Pw of a heating pulse portion are updated so as to increase at predetermined intervals according to an increase in recording linear velocity. 3. A ratio of a pulse width of the head heating pulse at a maximum recording linear velocity at an outermost peripheral position to each set value at a minimum recording linear velocity at an innermost peripheral position of the optical disk medium. So that Ttop is in the range of 0.05T to 0.25T as the cumulative increase,
Further, each set value is changed in accordance with the increase in the recording linear velocity so that the pulse width ratio Ttail of the last heating pulse falls within the range of 0.1T to 0.3T as the cumulative increase. 3. The information recording method according to claim 2, wherein: 4. The recording power Pw of the heating pulse portion at the maximum recording linear velocity at the outermost peripheral position of the optical disk medium with respect to each set value at the minimum recording linear velocity at the innermost peripheral position of the optical disk medium. Ratio ρmax = Pwmax / Pwm
3. The information according to claim 2, wherein the set value of the recording power is changed in accordance with the increase in the recording linear velocity so that in is in the range of 0.4 to 0.6 as the cumulative increase. Recording method. 5. The pulse width of the head heating pulse at the minimum recording linear velocity at the innermost position of the optical disk medium, wherein the pulse width of the head heating pulse with respect to the shortest mark data length (X) T is +0. The front edge position is corrected to be longer in the range of .02T to + 0.06T, and the space length immediately before the mark to be formed is the shortest length (X) T
, The leading edge position of the head heating pulse of the mark to be formed is set and recorded in the range of -0.02T to -0.12T so that the pulse width of the head heating pulse is shortened. The information recording method according to any one of claims 2 to 4, wherein: 6. When the pulse width of the last heating pulse at the minimum recording linear velocity at the innermost position of the optical disk medium is set, the space length immediately after the mark to be formed is the shortest length (X) T.
, The trailing edge position of the last heating pulse of the mark to be formed is set and recorded in the range of -0.02T to -0.12T so that the pulse width of the last heating pulse is shortened. The information recording method according to any one of claims 2 to 5, wherein the information is recorded. 7. The setting of each set value so that the difference between the asymmetry of the longest data and the shortest data of the record information to be reproduced is within 10% before and after updating any set value of the recording pulse. 7. The information recording method according to claim 1, wherein a change amount or an update interval is set. 8. An amount of change in a set value of a recording pulse to be updated at a predetermined interval based on an optimum set value of the set value of the recording pulse preformatted on the optical disk medium for each of a plurality of recording linear velocities. 8. The information recording method according to claim 1, wherein the gradient is calculated. 9. A recording pulse to be updated at a predetermined interval based on an optimum setting value for each of a plurality of recording linear velocities of a setting value of the recording pulse included in disc information recorded in a predetermined area earlier. The information recording method according to any one of claims 1 to 7, wherein a change amount or a gradient of the set value is calculated. 10. A change amount or gradient of a set value of a recording pulse to be updated at a predetermined interval based on an optimum set value of the set value of the recording pulse stored in advance in an information recording device for each of a plurality of recording linear velocities. The information recording method according to any one of claims 1 to 7, wherein is calculated. 11. Detecting address information preformatted on the optical disk medium, calculating a set value of the recording pulse corresponding to the address information from a change amount or a gradient updated at the predetermined interval, 11. The information recording method according to claim 1, wherein a set value of the recording pulse according to the address information is calculated by associating an interval of the address information with a range of the address information. 12. 12. When recording on an optical disk medium having a recording layer on which information is recorded by a laser beam having a light emission waveform by a recording pulse train composed of a plurality of heating pulses, a recording clock cycle T according to a change in recording linear velocity. And change
An information recording apparatus that performs recording such that a recording linear density becomes substantially constant, wherein a pulse width of the first heating pulse, a pulse width of the last heating pulse, and a recording power of the heating pulse portion are both changed. As described above, the front edge position of the leading heating pulse, the trailing edge position of the last heating pulse, and the set value of the recording power are updated as needed at predetermined intervals according to a desired recording linear velocity, and the detected A controller for calculating a pulse width and a recording power of the first and last heating pulses corresponding to the address information of the optical disc medium; and a pulse width of the first and last heating pulses calculated corresponding to the detected address information. Pulse width varying means for changing the leading edge position of the leading heating pulse and the trailing edge position of the trailing heating pulse in accordance with Information recording apparatus and a driver circuit for continuously updated amount of emitted light of the laser light source in accordance with a recording power of the heating pulse portions which are calculated corresponding to the address information. 13. When recording on an optical disk medium having a recording layer on which information is recorded by a laser beam having a light emission waveform by a recording pulse composed of a first heating pulse and a subsequent heating pulse, the recording pulse varies according to a change in recording linear velocity. An information recording apparatus that performs recording by changing the recording clock cycle T so that the recording linear density becomes substantially constant, wherein the ratio Ttop of the pulse width of the first heating pulse to the recording clock cycle T and the last one. The leading edge position of the first heating pulse and the last edge position of the first heating pulse are changed according to a desired recording linear velocity so as to change both the ratio Ttail of the pulse width of the heating pulse to the recording clock cycle T and the recording power Pw of the heating pulse portion. The set values of the trailing edge position of the tail heating pulse and the recording power of the heating pulse portion are updated as needed at predetermined intervals, and the detected address information is updated. A controller for calculating a corresponding front edge position of the first heating pulse, a rear edge position of the last heating pulse, and a recording power of the heating pulse portion; and for changing a front edge position of the first heating pulse in the recording pulse. A multi-stage edge signal generation circuit for outputting a rear edge signal for changing a front edge signal and a rear edge position of a rearmost heating pulse; and a multi-stage front edge signal and a rear stage output from the edge signal generation circuit. From among the edge signals, a selector for selecting a front edge signal corresponding to the front edge position of the leading heating pulse corresponding to at least the detected address information and a trailing edge signal corresponding to the trailing edge position of the last heating pulse, The power of the laser light source is changed according to the recording power of the heating pulse portion corresponding to the detected address information. Information recording apparatus comprising: a driver circuit for continuously updated the amount of light, a. 14. An information processing device incorporating the information recording device according to claim 12.