JP3165216B2 - Mark edge recording method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mark edge recording method in an optical disk drive or a magneto-optical disk drive and an apparatus therefor.

[0002]

2. Description of the Related Art In general, when data is written on an optical disk, a laser beam is irradiated onto an optical recording medium to apply heat, thereby making a hole in the medium, inverting the magnetization direction of the medium, or writing data on the medium. By changing the crystal state,
The data is recorded.

Here, as one of the recording methods of an optical disk, a code edge bit is made to correspond to each of a front edge and a rear edge of a recording mark so that the length of the recording mark carries information. There is. This recording method is suitable for high-density recording, but requires precise edge positions.

That is, when recording is performed by the mark edge recording method, due to the influence of the residual heat of the recording mark written immediately before,
Since the actual recording mark length is longer than the applied recording pulse or the heat accumulation by the laser beam is insufficient near the leading edge, the mark shape may be irregular as shown in FIG. Therefore, the edge position is shifted from the ideal position,
Jitter increases, and in the worst case, it becomes impossible to reproduce the original data. Therefore, in the mark edge recording method, accurate edge position control is required.

In view of the above, as an edge position control method, the pulse width and power of the recording light pulse are adjusted according to the recording radius of the optical disk or by the density of the recording data pattern (that is, by the blank length immediately before). The correction is disclosed in JP-A-63-53722.

[0006]

However, when recording on a medium having a high thermal conductivity such as a magneto-optical disk, not only the influence of the heat of the recording mark to be written but also the recording mark immediately before writing is obtained. The position of the leading edge and the trailing edge of the recording mark is shifted due to the influence of the residual heat of the recording mark. That is, since the amount of residual heat accumulated on the optical disc differs depending on the difference between the immediately preceding mark length and the blank length, the amount of edge position shift changes depending on the recording data pattern.
For example, as shown in FIG. 12, even if the blank lengths are equal, as in the case of the data pattern a and the data pattern b, the amount of heat accumulated on the optical disc is different if the immediately preceding recording pulse length is different. Of the edge is different. Therefore, when recording on a magneto-optical disk, as in the conventional method, the correction amount of the pulse width and power of the recording pulse is set to be constant, or the correction amount is determined only by the immediately preceding blank length. Position control cannot be performed.

When correcting the irregularity of the mark shape as described above, the degree of non-uniformity of the mark shape differs depending on the recording data pattern for the same reason as described above. In the conventional method in which the value is set to a constant value or determined only by the immediately preceding blank length, the correction of the mark shape becomes incomplete.

[0008]

According to the first aspect of the present invention, information is recorded by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information. In the mark edge recording method described above, the recording pulse length L _{0 to be written} , the blank length L ₁ immediately before the recording pulse, and the immediately preceding recording pulse length L ₂ are calculated, and these lengths L ₀ and L ₁ are calculated. , according to three values of L ₂ set the correction value of the pulse width and the output timing for said write target of the recording pulse, the length by following this correction value
Based on the three values L ₀ , L ₁ and L ₂ , both the rising and falling edge positions of the recording pulse to be written are corrected for recording.

According to the second aspect of the present invention, in addition to the pulse width and the output timing for the recording pulse to be written, the recording power of the rising portion of the recording pulse and a correction value for changing the recording power are set. follow the correction value Ukoto
In was to record to correct the rising and falling both edge positions and mark shape to be written recording pulse based on the length L _0, L _1, 3 one value of L _2.

According to the third aspect of the present invention, the recording pulse length L _{0 to be} written and the blank length L immediately before the recording pulse are set.
In addition to ₁ and the preceding recording pulse length L _2, and to set the correction value by calculating one or more of the blank length and the recording pulse length further prior.

According to a fourth aspect of the present invention, a recording pulse length L _{0 to be written} , and blank lengths L ₁ and L ₁ immediately before the recording pulse are used.
One prior recorded data pattern identifying means for calculating a recording pulse length L ₂ arranged in, these lengths L _0, L _1, of the L ₂ 3 two
The correction value setting means for setting a correction value of the pulse width and the output timing for said write target of the recording pulse in accordance with the value provided, follow Ukoto the correction value by the correction value setting means
And a recording pulse correction means for correcting both the rising and falling edge positions of the recording pulse to be written based on the three values of the lengths L ₀ , L ₁ and L ₂ .

According to a fifth aspect of the present invention, in the fourth aspect of the invention, there is provided a recording data pattern identifying means for calculating a recording pulse length and a blank length by a counter.

At this time, in the invention according to claim 6, a counter for counting the recording pulse length and a counter for counting the blank length are separately provided.

Further, in these inventions, the invention according to claim 7 is a correction value setting means comprising a ROM in which the correction values of the recording pulses corresponding to the lengths L ₀ , L ₁ , L ₂ information are stored in advance. .

According to the present invention, the discriminating means for discriminating the type of the optical recording medium and the correction value of the recording pulse corresponding to the information of the lengths L ₀ , L ₁ , L ₂ are previously determined for each type of the optical recording medium. And a selection means for selecting a corresponding ROM according to the result of the determination by the determination means.

According to the ninth aspect of the present invention, the discriminating means for discriminating the type of the optical recording medium, and the recording pulse corresponding to the length L ₀ , L ₁ , L ₂ information suitable for the discriminated type of the optical recording medium. And a write control means for writing the correction value to the RAM.

In this case, according to the tenth aspect of the present invention, the optical recording
A recording pulse correction value suitable for the type is stored in a designated area of the recording medium, and the write pulse correction value read from the designated area is written to the RAM by the write control means.

According to the eleventh aspect of the present invention, when the power is turned on, before data is recorded, or when the apparatus is idle,
Writing control means for writing to M is used.

According to a twelfth aspect of the present invention, in the fourth aspect of the invention, the pulses indicating the leading edge position information and the trailing edge position information of the recording data pattern are each delayed based on the correction value of the recording pulse by the correction value setting means. And a pulse train delayed by the delay
A recording pulse correcting means including a generating means for generating a recording pulse based on the RZI code.

[0020] Similarly, in the invention of claim 13, wherein, in the fourth aspect of the invention, a pulse train separating means for separating the pulses indicating the pulse and trailing edge position information indicating the front edge position information of the recorded data pattern, Delay means for delaying each of the separated pulse trains based on the correction value of the recording pulse by the correction value setting means; and generating means for generating a recording pulse by the NRZI code from each pulse train delayed by the delay means. Recording pulse correction means was used.

[0021] In the invention of claim 14, claim 12 also
In the invention according to the thirteenth aspect , the toggle operation is repeated every time a pulse indicating the leading edge position information and a pulse indicating the trailing edge position information, which are respectively delayed based on the correction value of the recording pulse, are input, and the recording pulse based on the NRZI code is repeated. Is generated by a toggle-type flip-flop for generating the data.

According to a fifteenth aspect of the present invention, in accordance with the thirteenth aspect of the present invention, there is provided a front generation means for generating an NRZI code in which only the pulse train indicating the front edge position information is corrected, and only a pulse train indicating the rear edge position information. Corrected N
The generating means includes a generating means for generating the RZI code, and an AND gate to which the outputs of the generating means for the front and the generating means for the input are input.

[0023]

According to the first and fourth aspects of the present invention, when performing mark edge recording, the recording pulse length L ₀ , the immediately preceding blank length L _1, and the immediately preceding recording pulse length to be written are to be written. since so as to correct the pulse width and output timing of recording pulses to be written in response to L _2, not only the effect of immediately preceding blank length, also becomes correction considering the influence of the remaining heat about the previous recording mark, The edge position of the recording mark is accurately controlled.

According to the second aspect of the present invention, as the correction value of the recording pulse, in addition to the pulse width and the output timing of the recording pulse, the power of the rising portion of the recording pulse and the length of changing the power are also corrected. As a result, not only the edge position of the recording mark but also the shape of the mark is accurately controlled.

According to the third aspect of the present invention, not only the immediately preceding blank length and recording pulse length but also the preceding blank length and recording pulse length are taken into account, and the correction is performed.
The correction is made in consideration of the influence of the residual heat accumulated around the optical recording medium, and the edge position of the recording mark is more accurately controlled.

According to the fifth aspect of the present invention, since the recording data pattern identifying means is constituted by a counter, the required recording pulse length and blank length can be reliably calculated with a simple configuration.

According to the sixth aspect of the present invention, the recording pulse length and the blank length are calculated by separate counters, which is suitable for high-speed recording.

According to the seventh aspect of the present invention, since the correction value setting means is constituted by the ROM in which the correction values are stored in advance, the correction values for the recording marks can be set very easily.

In the present invention, a plurality of ROMs are provided as the correction value setting means, and the ROM is selected according to the type of the optical recording medium. If different, it can be appropriately dealt with.

In the ninth aspect of the present invention, the correction value setting means has a RAM configuration, and the correction value of the recording pulse is written according to the type of the optical recording medium. Can be properly dealt with even if the values are different.

In this case, in the invention according to the tenth aspect, a correction value suitable for the optical recording medium is stored in a designated area, and the correction value is read and written to the RAM. This makes it possible to correct the recording pulse suitable for each optical recording medium by using a capacity, and to precisely control the edge position.

Further, in the invention according to the eleventh aspect, since the writing of the correction value to the RAM is performed at a timing such as when the power is turned on, the processing is performed without obstructing the original recording / reproducing operation. it can.

According to the twelfth aspect of the present invention, the pulses indicating the leading edge position information and the trailing edge position information of the recording data pattern are each delayed according to the correction value, and the recording pulse of the NRZI code is generated from the delayed pulse train. Therefore, a recording pulse based on the correction value can be obtained extremely simply.

According to the thirteenth aspect of the present invention, the pulses indicating the leading edge position information and the trailing edge position information of such a recording data pattern are separated by the separating means, and the NRZI code recording pulse is generated through delay processing. This makes it possible to cope with high-speed recording.

In the fourteenth aspect of the present invention, since such a recording pulse generating means is constituted by a toggle flip-flop, it is possible to extremely easily generate a recording pulse based on a correction value.

According to the fifteenth aspect of the present invention, the NRZI code in which only the pulse indicating the leading edge position information is corrected, and the NRZI code in which only the pulse indicating the trailing edge position information is corrected
Since the ZI code and the ZI code are generated separately and the recording pulse is generated by taking the AND of both, a high-speed operation can be supported.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The present embodiment corrects the pulse width of the recording pulse, the output timing, the power at the rising edge of the recording pulse, and the length at which the recording power is changed according to the recording data pattern, so that the edge position of the recording mark, Further, the mark shape is controlled with high precision, and the correction method will be described with reference to FIG.

First, when writing data by the mark edge recording method, the data is written in NRZI code (Non Return t
o If the data is converted to Zero Inverted code and recorded without correction, the recording mark will be written longer than the ideal state as described above. Shown). Therefore, in the present embodiment, such a recording pulse is corrected according to the recording data pattern, and control is performed so that the edge position of the recording mark comes to an ideal position. For example, the pulse length of a recording pulse to be written to be written is L
₀ , when the blank length immediately before this recording pulse is L ₁ and the preceding recording pulse length is L ₂ , these lengths L ₀ ,
L _1, L ₂ is calculated, and the calculated of these lengths L _0,
The pulse width and output timing of the recording pulse to be written are corrected according to L ₁ and L ₂ to control the edge position of the recording mark.

Such a correction method is achieved by a configuration as shown in FIG. Broadly speaking, it comprises a recording data pattern identification means 1, a correction value setting means 2, and a recording pulse correction means 3. First, as a premise, input data sent from a controller (not shown) is modulated by a modulator (not shown) to be modulated data. This modulation scheme may be any scheme, for example, (2,7) RLL code (Run Length Limited code).
And (1, 7) RLL codes. Here, in this embodiment, is not directly outputs the NRZI code from the modulator, and outputs the modulated data NR Z code,
With this as an input, correction according to the data pattern of the modulation data is performed, and a recording pulse of the NRZI code is output.

Such modulation data is input to the recording data pattern identification means 1 and the above-mentioned lengths L ₀ , L ₁ , L
₂ is calculated. The calculated data of the lengths L ₀ , L ₁ , L ₂ are inputted to the correction value setting means 2, and the pulse width of the recording pulse and the correction value of the output timing are set according to the recording data pattern based on these data. Is done. For example, the output timing of the leading edge and the output timing of the trailing edge of the recording pulse are set, and the pulse width is determined from these two timings. Based on such a correction value,
The recording pulse correction means 3 corrects the recording pulse, sends out the corrected recording pulse information to a laser drive circuit (not shown), and blinks a semiconductor laser (not shown) to form a recording mark on the optical recording medium. Is done.

The structure and operation will be described in more detail. First, the recording data pattern identification means 1 receives modulation data as input, and as the pattern data, the pulse length L _{0 of} the recording pulse to be written, the blank length L ₁ immediately before the recording pulse, and the recording pulse length immediately before the recording pulse. it is intended to determine the L _2. Here, the recording pulse length and the blank length are sequentially counted by the counter 4 based on the modulation data, and the count values are stored in the registers 5, 6, and 7, respectively. The register 5 is for the pulse length L ₀ of the recording pulse to be written, and the register 6 is for the immediately preceding blank length L ₁
Use, register 7 is for recording pulse length L ₂ of the previous one.
When the data of these lengths L ₀ , L ₁ , L ₂ are available, they are output to the correction value setting means 2. In addition, not only the data of these lengths L ₀ , L ₁ , L ₂ but also the preceding 1
It is also easy to configure such that data of one or a plurality of blank lengths and recording pulse lengths is obtained.

Next, the correction value setting means 2 of the present embodiment
OM8. That is, the data of the lengths L ₀ , L ₁ , and L ₂ calculated by the recording data pattern identification means 1 are used as the address input of the ROM 8, and the length L
The optimum value of the correction value of the recording pulse corresponding to the data of ₀ , L ₁ and L ₂ is stored in advance, and the output of the ROM 8 is used as the correction data of the recording pulse to be written. As such correction data, the output timing of the leading edge and the output timing of the trailing edge of the recording pulse may be stored. Incidentally, the pulse width is determined by these two output timings. Further, in addition to these pulse widths and output timings, if the correction value of the power of the rising portion of the recording pulse and the length of change in the power are stored in the ROM 8 as correction data, the mark shape can be corrected. Gain. The length L _0, L _1, of L ₂ input to ROM8
The value is set by the address latch function of the ROM 8 as necessary.
May be held .

The recording pulse correction means 3 corrects the recording pulse based on the correction value output from the correction value setting means 2, and in the present embodiment, the delay element 9 serving as the delay means
, A selector 10 and a toggle flip-flop 11 serving as a generating means are connected in cascade, and the selection operation of the selector 10 is controlled by the output of the ROM 8. First,
As shown in FIG. 3, in the modulation data, a leading edge pulse for determining the rising edge of the recording pulse and a trailing edge pulse for determining the falling edge are alternately arranged. When this is input to the toggle flip-flop 11, the NRZI code is obtained. It is converted and its output becomes a recording pulse. Therefore, the correction value setting means 2
While the correction data obtained by the ROM 8 is used as a select signal, each pulse is delayed by the delay element 9 and input to the selector 10 to select one of them. By the way, when shortening the recording pulse width, it is necessary to advance the trailing edge pulse, but since there is no element that actually advances the pulse, here, by receiving the modulation data a predetermined time earlier, The leading and trailing edge pulses are each delayed. When the pulse train delayed based on the correction data is input to the toggle flip-flop 11, the output Q of the toggle flip-flop 11 becomes a recording pulse corrected according to the recording data pattern.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as the parts shown in the above-mentioned embodiment are denoted by the same reference numerals (the same applies to the following embodiments). This embodiment corresponds to the sixth aspect of the present invention. In the recording data pattern identification means 1, two counters 12 and 13 are provided instead of the counter 4, and the counter 12 is dedicated to the recording pulse length. Is used exclusively for the blank length. For this reason, the enable signal is applied to the counter 12 only when calculating the recording pulse length, and the enable signal is applied to the counter 13 only when calculating the blank length. By separately calculating the recording pulse length and the blank length in this manner, high-speed recording can be handled.

A third embodiment of the present invention will be described with reference to FIGS. This embodiment corresponds to the thirteenth aspect of the present invention. In the recording pulse correcting means 14 of the present embodiment, first, a demultiplexer 15 is provided as a pulse train separating means for separating the input modulated data into a front edge pulse for determining the rising edge of the recording pulse and a rear edge pulse for determining the falling edge. Have been. At the subsequent stage of the demultiplexer 15, a delay element 16 serving as delay means for a front edge pulse and a selector 17 are provided, and a delay element 18 serving as delay means for a rear edge pulse is provided.
And a selector 19 are provided. The leading edge pulse delay data select signal in the correction data from the correction value setting means 2 is applied to the selector 17 and the delay element 1
One of the leading edge pulses delayed by 6 is selected by the selector 17. Similarly, a trailing edge pulse delay data select signal in the correction data from the correction value setting means 2 is applied to the selector 19, and one of the trailing edge pulses delayed by the delay element 18 is selected by the selector 19. Configuration. An SR flip-flop 20 is provided as a generation unit that uses the output of the selector 17 as a set signal and the output of the selector 19 as a reset signal. Therefore, the output Q of the SR flip-flop 20 becomes a recording pulse corrected according to the recording data pattern as shown in FIG.

According to this embodiment, since the delay processing and the generation processing of the recording pulse of the NRZI code are performed separately for the front edge pulse and the rear edge pulse, it is possible to cope with high-speed recording.

A fourth embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the invention described in claim 15, and is a modification of the above embodiment. That is,
An NRZI code in which only the front edge position is corrected from the front edge pulse delayed based on the correction data is generated by a flip-flop, while an NRZ code in which only the rear edge position is corrected from the rear edge pulse delayed based on the correction data.
A ZI code is generated by a flip-flop, and these two NRZI codes are input to an AND gate (not shown) to perform an AND operation. As a result, a recording pulse corrected according to a recording data pattern is obtained as an AND gate output. It is intended to be. Also in the case of this embodiment, it is possible to cope with high-speed recording as in the above-described embodiment.

Further, a fifth embodiment of the present invention will be described with reference to FIG. This example relates to claim 8 corresponds to the invention described, the correction value setting means 21 for the optimal value of more correction value on the type of the optical recording medium is assumed that different.
In other words, instead of the correction value setting means 2 constituted by one ROM 8 shown in FIG.
In No. 1, a plurality of ROMs 22a, 22b,..., 22n storing optimum correction values for each type of optical recording medium, and a selector 23 as a selecting means for selecting one of the ROMs 22a, 22b,. It is composed of The selector 23 performs a selecting operation in response to a select signal from a CPU (not shown) as a discriminating means for discriminating the type of the optical recording medium.

Therefore, when the optimum value of the correction value differs depending on the type of the optical recording medium, the type is determined, and one of the ROMs 22a, 22b,..., 22n is selected and used according to the type. What is necessary is just to change the correction value. Here, as a method for determining the type of the optical recording medium, for example, data indicating the type of the medium is previously recorded in a designated area of the optical recording medium, and when power is turned on, before data recording, or when the drive device is idle, The type information of the optical recording medium may be read, or the type information may be input by a switch operation by the user. As the designated area of the optical recording medium, for example, an SFP (Standard Formed P
art) is used. According to this embodiment, it is possible to appropriately cope with the case where the correction value differs depending on the type of the optical recording medium.

Next, a sixth embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the ninth aspect of the present invention, wherein the correction value setting means is constituted by a RAM. In this case, a discriminating means for discriminating the type of the optical recording medium is provided similarly to the above embodiment. Then, when the power is turned on or before data recording, the CP
U is used as a write control unit to write a write pulse correction value suitable for an optical recording medium of the type determined in advance in the RAM. Thereafter, as in the case of using the ROM, the lengths L ₀ , L ₁ , L ₁ calculated by the recording data pattern identification means 1 are used.
_{The two} information may be input to the address of the RAM, and the output of the RAM may be set as a correction value of the recording pulse.
FIG. 9 is a flowchart showing a process of writing a correction value to the RAM.

Therefore, according to the present embodiment, it is possible to perform the optimum correction according to the type of the optical recording medium.

Further, a seventh embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the tenth aspect of the present invention, in which the correction value setting means is constituted by a RAM, and the correction value is written in the RAM by using an optical recording medium, as in the above embodiment. It was made. That is, the designated area of the optical recording medium (such as the SFP described above)
The correction value itself suitable for the optical recording medium is recorded in advance, and at power-on or before data recording, the correction value data recorded in the designated area is read, and the correction value data is stored in the RAM. It is intended to be written. FIG. 10 is a flowchart showing such a process of writing correction value data to the RAM. Subsequent processing may be performed in the same manner as in the above embodiment.

In the case of this embodiment, as in the above embodiment, even if the correction differs depending on the type of the optical recording medium, it is possible to cope with a small memory capacity using only one RAM, There is no need to store the correction values for each type on the controller side on which is mounted, and the memory capacity in the controller can be reduced.

In the embodiment using these RAMs, the writing of the correction value data into the RAM is performed at the time of turning on the power supply, before the data recording, and when the drive device is in an idle state. The original operations such as recording / reproduction of the apparatus are not hindered.

[0055]

According to the first and fourth aspects of the present invention, when performing mark edge recording, the recording pulse length L ₀ to be written from now on and the blank lengths L ₁ and L ₁ just before writing to be written.
Since so as to correct the pulse width and output timing of recording pulses to be written in accordance with the recording pulse length L ₂ of the front One, not only the influence of the immediately preceding blank length, the influence of the remaining heat about the previous recording mark And the position of the edge of the recording mark can be accurately controlled.

According to the second aspect of the present invention, as the correction value of the recording pulse, in addition to the pulse width and output timing of the recording pulse, the power of the rising portion of the recording pulse and the length of changing the power are also determined. Since the correction is performed, not only the control of the edge position of the recording mark but also the control of the mark shape can be performed accurately.

According to the third aspect of the present invention, the correction is made in consideration of not only the immediately preceding blank length and recording pulse length but also the preceding blank length and recording pulse length. The correction is made in consideration of the influence of the accumulated residual heat, and the edge position of the recording mark can be controlled more accurately.

According to the fifth aspect of the present invention, since the recording data pattern identification means is constituted by a counter, the required recording pulse length and blank length can be reliably calculated with a simple configuration.

According to the sixth aspect of the present invention, the recording pulse length and the blank length are calculated by separate counters, so that the recording pulse length and the blank length are suitable for high-speed recording.

According to the seventh aspect of the present invention, the correction value setting means is constituted by the ROM in which the correction values are stored in advance, so that the correction values for the recording marks can be set very easily.

According to the present invention, a plurality of ROMs are provided as the correction value setting means, and the ROM is selected according to the type of the optical recording medium. Can be appropriately dealt with even if the values are different.

According to the ninth aspect of the present invention, the correction value setting means has a RAM configuration, and the correction value of the recording pulse is written according to the type of the optical recording medium.
, And it is possible to appropriately cope with the case where the correction value differs depending on the type of the optical recording medium.

At this time, according to the tenth aspect of the present invention,
A correction value suitable for the optical recording medium is stored in a designated area of the optical recording medium, and the correction value is read and written into the RAM. Correction can be performed, and accurate control of the edge position becomes possible.

Further, according to the invention of claim 11,
Since the writing of the correction value into the RAM is performed at a timing such as when the power is turned on, the processing can be performed without obstructing the original recording / reproducing operation.

According to the twelfth aspect of the invention, the pulses indicating the leading edge position information and the trailing edge position information of the recording data pattern are each delayed according to the correction value, and the recording pulse of the NRZI code is generated from the delayed pulse train. As a result, a recording pulse based on the correction value can be obtained extremely simply.

According to the thirteenth aspect of the present invention, the pulses indicating the leading edge position information and the trailing edge position information of such a recording data pattern are separated by the separating means, and the NRZI code recording pulse is passed through each delay processing. Since it is generated, it is possible to cope with high-speed recording.

According to the fourteenth aspect of the present invention, since such a recording pulse generating means is constituted by a toggle flip-flop, it is possible to extremely easily generate a recording pulse based on a correction value.

According to the fifteenth aspect, the NRZI code in which only the pulse indicating the leading edge position information is corrected and the NRZI code in which only the pulse indicating the trailing edge position information is corrected
Since the ZI code and the ZI code are generated separately and the recording pulse is generated by taking the AND of both, a high-speed operation can be supported.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a correction method according to a first embodiment of the present invention.

FIG. 2 is a block diagram.

FIG. 3 is an explanatory diagram showing an operation of a recording pulse correction unit.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a block diagram showing a third embodiment of the present invention.

FIG. 6 is a timing chart showing the operation.

FIG. 7 is a timing chart showing a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing a fifth embodiment of the present invention.

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

FIG. 10 is a flowchart showing a seventh embodiment of the present invention.

FIG. 11 is an explanatory diagram showing an irregular shape of a recording mark according to a conventional method.

FIG. 12 is an explanatory diagram showing an edge position shift according to a conventional method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 recording data pattern identification means 2 correction value setting means 3 recording pulse correction means 4 counter 8 ROM 9 delay means 10 selection means 11 generation means = toggle flip-flop 12 counter 13 counter 14 recording data pattern identification means 15 separation means 16 delay means 18 delay means 20 generation means 21 correction value setting means 22 ROM 23 selection means

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-137224 (JP, A) JP-A-5-135363 (JP, A) JP-A-5-197957 (JP, A) JP-A-3-1979 22223 (JP, A) Hiroshi Ide, et al., “Edge misalignment characteristics of magneto-optical disks”, IEICE Spring Conference, Spring 1991, p. 4-392 H. Sugiyama, et al., “Study of analysis method for pit edge recording / playback characteristics (III)”, IEICE Autumn National Assembly, Autumn 1990, p. 4-365 (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/125

Claims (15)

(57) [Claims] 1. A mark edge recording method in which information is recorded by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information. The recording pulse length L ₀ , the blank length L ₁ immediately before the recording pulse, and the immediately preceding recording pulse length L ₂ are calculated, and the writing is performed according to the three values L ₀ , L ₁ , and L _2. set the correction value of the pulse width and the output timing for the target of the recording pulse, intends follow the correction value
That it has to be recorded by correcting the length L _0, L _1, et <br/> Tsu di positions of both rising and falling of the write target of the recording pulse based on the three values of L ₂ by Characteristic mark edge recording method. 2. A mark edge recording method in which information is recorded by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information. The recording pulse length L ₀ , the blank length L ₁ immediately before the recording pulse, and the immediately preceding recording pulse length L ₂ are calculated, and the writing is performed according to the three values L ₀ , L ₁ , and L _2. The pulse width for the recording pulse of interest,
Output timing, to set the correction value of the recording power and the length of changing the recording power of the recording pulse rising portion, the three values of the length L _0, L _1, L ₂ By following this correction value
Rise and rise of the recording pulse to be written
Mark edge recording method characterized by the falling both edge positions and mark shape so as to record the corrected. 3. A recording pulse length to be written L _0, just before the recording pulse blank length L ₁ and the preceding recording pulse length L ₂
2. The mark edge recording method according to claim 1, further comprising calculating one or more preceding blank lengths and recording pulse lengths and setting a correction value. 4. A mark edge recording apparatus in which information is recorded by irradiating an intensity-modulated laser beam onto an optical recording medium to form a recording mark whose length carries the information. A recording data pattern identifying means for calculating the recording pulse length L ₀ , the blank length L ₁ immediately before the recording pulse, and the immediately preceding recording pulse length L ₂ is provided, and these three lengths L ₀ , L ₁ , and L ₂ are provided. One of the correction value setting means for setting a correction value of the pulse width and the output timing for said write target of the recording pulse is provided in response to the value, the length L ₀ by following the correction value by the correction value setting means, L ₁ , L
The rising of the recording pulse to be written based on the three values of ₂
A mark edge recording apparatus comprising recording pulse correction means for correcting both rising and falling edge positions. 5. The mark edge recording apparatus according to claim 4, wherein said recording data pattern identification means calculates a recording pulse length and a blank length by a counter. 6. The mark edge recording apparatus according to claim 5, wherein a counter for counting a recording pulse length and a counter for counting a blank length are separately provided. 7. A correction value setting means comprising a ROM in which correction values of recording pulses corresponding to lengths L ₀ , L ₁ , and L ₂ information are stored in advance. Mark edge recording device. 8. A discriminating means for discriminating the type of the optical recording medium, and a plurality of discriminating means in which correction values of recording pulses corresponding to lengths L ₀ , L ₁ and L _{2 are} stored in advance for each type of the optical recording medium. ROM
7. A mark edge recording apparatus according to claim 4, wherein the correction value setting means comprises: a selection means for selecting a corresponding ROM according to a result of the determination by the determination means. 9. A discriminating means for discriminating the type of the optical recording medium, and a length L ₀ ,
L _1, L ₂ and RAM in which the correction value of the recording pulse are written in accordance with the information, claim 4 and 5, characterized in that it has a more becomes the correction value setting means and write control means for the RAM
Or the mark edge recording device according to 6. 10. A recording pulse correction value suitable for the type is stored in a designated area of the optical recording medium, and the write pulse correction value read from the designated area by the write control means is set to R.
10. The recording medium according to claim 9, wherein the data is written to the AM.
The mark edge recording device according to the above. 11. A writing control means for writing data to a RAM when power is turned on, before data is recorded, or when the apparatus is in an idle state.
0 mark edge recording device. 12. A delay unit for delaying pulses indicating front edge position information and rear edge position information of a recording data pattern based on a correction value of a recording pulse by a correction value setting unit, and a pulse train delayed by the delay unit. N
5. The mark edge recording apparatus according to claim 4, wherein said recording pulse correcting means comprises a generating means for generating a recording pulse based on an RZI code. 13. A pulse train separating means for separating a pulse indicating front edge position information and a pulse indicating rear edge position information of a recording data pattern, and a correction value of a recording pulse by a correction value setting means for each separated pulse train. 5. The mark according to claim 4, wherein the recording pulse correction means comprises: delay means for delaying each of the pulse trains on the basis of the pulse train; and generating means for generating a recording pulse based on the NRZI code from each pulse train delayed by the delay means. Edge recording device. 14. A toggle operation is repeated each time a pulse indicating front edge position information and a pulse indicating rear edge position information delayed based on a correction value of a recording pulse are input, to generate a recording pulse based on an NRZI code. 14. The mark edge recording apparatus according to claim 12, wherein the generating means comprises a toggle flip-flop. 15. A pre-generation unit for generating an NRZI code in which only a pulse train indicating front edge position information is corrected,
NRZ corrected only pulse train indicating trailing edge position information
14. A generating means comprising: a generating means for generating an I code; and an AND gate to which outputs of the generating means for the front and the generating means are inputted.
The mark edge recording device according to the above.