JP2002170235A - Recording method and recording device for optical information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording method for optical information for forming recording marks of desired lengths with high accuracy. SOLUTION: An optical driving waveform 4041 is so constituted as to delay the driving start time by B18 (2, 2) with respect to a reference signal 4100 and to end the driving end time earlier by E18(1, 4). B18(2, 2) is determined as a function of the certain power length T4101 of a non-recording segment immediately before and the certain power length T4102 of the recording mark in such a manner than the thermal state in the beginning end segment of the mark is made constant regardless of recording pattern. E18(2, 4) is determined as a function of the certain power length T4102 of the recording mark and the certain power length T4103 of the non-recording segment right behind in such a manner than the thermal state in the terminal segment of the mark is made constant regardless of recording patterns. Accordingly, both the beginning end and terminal of the mark are formable in desired positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for recording optical information for optically recording and reproducing.

[0002]

2. Description of the Related Art Optical discs for recording information using a laser beam have already been put to practical use, but higher densities are required. PWM for giving information to edges of recording marks as a means for higher density
(Pulse width modulation) recording has been proposed.

FIG. 57 shows a conventional recording method. The laser is driven with the same drive waveform (48b) in response to the recording signal (48a).

[0004]

However, the conventional method has the following problems.

In the conventional method, the rise and fall of the optical drive waveform (48b) coincide with the rise and fall of the recording signal (48a). The length W5701 of the range (48c) irradiated with the light spot is the desired time T5.
701.

Accordingly, the formed recording mark (48d)
, The mark start end portion is d570 from the desired position.
The mark end portion is longer than the desired position by d5702.

When recording a recording signal T5702 having a different length, d570 is similarly applied at the mark start end.
3. The length of the mark is longer by d5704 at the end of the mark, but at the start of the mark, the heat history at the start of the mark, particularly the cooling condition after the temperature rises, differs depending on the length of the mark.
3 ≠ d5701, and since the heat accumulation at the end of the mark varies depending on the mark length, d5704 ≠ d5702
Becomes

Further, even with a recording signal T5703 having the same length as T5701, the interval from the previous mark is different (B57).
03 ≠ B5701), and the influence of heat on the mark start end of the current recording power is different from the previous recording power, so the mark start end elongation is different (d5705 ≠ d5701).
The distance from the next mark is different (A5703 @ A570
Since the thermal history at the end of the mark differs from that of 1), the extension of the end of the mark is different. (D5706 ≠ d5702) As described above, in the conventional method, a recording mark having a length different from a desired length is formed, and the amount of the difference varies depending on the length of the mark and the interval between the preceding and following marks. Had.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a method and apparatus for recording optical information for forming a recording mark of a desired length at a desired position with high accuracy.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention records optical information by forming a large number of recording marks on a recording medium by irradiating light from a light source such as a laser. In this case, the configuration is as follows.

In the first invention, when forming one current recording mark, the driving of the light source at the recording power of the light source for forming the current recording mark is started in accordance with the length of the current recording mark. Change the time.

As a means for realizing the first invention, a first measuring means for measuring a current recording signal output period, and a delay for delaying a current recording signal in accordance with a measurement result of the first measuring means. Means for driving the light source with the recording power from the rise of the recording signal delayed by the delay means to the fall of the recording signal before the delay.

In the second invention, when forming one recording mark at this time, the light source is driven by the recording power a plurality of times in a time-division manner. At this time, at least the first drive start time of the plurality of drives of the light source is changed according to the length of the current recording mark to be recorded.

According to a second aspect of the present invention, there is provided a pulse train signal converting means for converting each recording signal for recording optical information into a pulse train signal comprising a plurality of pulses. First measuring means for measuring, and delay means for delaying at least the first pulse of each pulse included in the pulse train signal obtained by the pulse train signal converting means in accordance with the measurement result of the first measuring means And driving means for driving the light source with recording power based on a pulse train signal including a pulse delayed by the delay means.

In the third invention, when one recording mark is formed this time, according to the length of the area of the non-recording portion immediately before the current recording mark and the length of the current recording mark, The drive start time at the recording power of the light source for forming the current recording mark is changed.

According to a third aspect of the present invention, there is provided a first measurement for measuring a no-signal period between a previous recording signal output and a current recording signal output for recording optical information. Means, a second measuring means for measuring a current recording signal output period, a delay means for delaying a current recording signal in accordance with both measurement results of the first and second measuring means, and a delay means And driving means for driving the light source with the recording power from the rising of the recording signal after the delay to the falling of the recording signal before the delay.

According to a fourth aspect of the present invention, when forming one recording mark at this time, the light source is driven with a recording power a plurality of times in a time-division manner. At this time, at least the first drive of the plurality of driving of the light source depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. Change the start time.

As a means for realizing the fourth invention, a pulse train signal converting means for converting each one recording signal for recording optical information into a pulse train signal composed of a plurality of pulses, and one previous recording signal output First measuring means for measuring a no-signal period between the current recording signal output and the current recording signal output, second measuring means for measuring the current recording signal output period, and the first and second measurements Delay means for delaying at least the first pulse of each pulse included in the pulse train signal obtained by the pulse train signal conversion means in accordance with both measurement results of the means, and a pulse train including the pulse delayed by the delay means Driving means for driving the light source with recording power based on the signal.

In the fifth invention, when one recording mark is formed this time, the length of the area of the non-recording part immediately before the recording mark and the recording of the previous formation positioned so as to sandwich the non-recording part are performed. The drive start time at the recording power of the light source for forming the current recording mark is changed according to the length of the mark and the length of the current recording mark.

As a means for realizing the fifth invention, a first measurement for measuring a no-signal period sandwiched between a previous output of one recording signal and a current output of a recording signal for recording optical information. Means, a second measuring means for measuring the output period of the previous recording signal immediately before the no-signal period, a third measuring means for measuring the output period of the present recording signal,
Delay means for delaying the current recording signal in accordance with the measurement results of the second and third measuring means; and the light source from the rising of the delayed recording signal to the falling of the recording signal before the delay by the delay means. Driving means for driving with recording power.

According to a sixth aspect of the present invention, when forming one recording mark this time, the light source is driven by the recording power a plurality of times in a time-division manner. Also, at this time, the length of the area of the non-recording part immediately before the current recording mark, the length of the recording mark of the previous formation positioned sandwiching the non-recording part, and the length of the current recording mark At least the first drive start time of the plurality of drives of the light source is changed according to the desired length.

As a means for realizing the sixth invention, a pulse train signal converting means for converting each one recording signal for recording optical information into a pulse train signal composed of a plurality of pulses, and one previous recording signal output A first measuring means for measuring a no-signal period sandwiched between the current recording signal output and a current recording signal output; a second measuring means for measuring a previous recording signal output period immediately before the no-signal period; Third measuring means for measuring the output period of the recording signal, and each pulse included in the pulse train signal obtained by the pulse train signal converting means according to the measurement results of the first, second, and third measuring means. And delay means for driving the light source with recording power based on a pulse train signal including the pulse delayed by the delay means.

In the seventh invention, when one recording mark is formed this time, the drive end time of the light source for forming the current recording mark is changed according to the length of the recording mark.

As a means for realizing the seventh invention, a first measuring means for measuring the output period of the current recording signal, and the present recording signal is delayed according to the measurement result of the first measuring means. A delay unit; and a driving unit that drives the light source with the recording power from the rising of the recording signal before the delay to the falling of the recording signal after the delay by the delay unit.

In the eighth invention, when forming one recording mark this time, the light source is driven by the recording power a plurality of times in a time-division manner. At this time, at least the last drive end time of the plurality of drives of the light source is changed according to the length of the current recording mark.

According to an eighth aspect of the present invention, there is provided a pulse train signal converting means for converting each recording signal for recording optical information into a pulse train signal comprising a plurality of pulses, and an output period of the present recording signal. And a delay for delaying at least the last pulse of each pulse included in the pulse train signal obtained by the pulse train signal converting means according to the measurement result of the first measuring means. Means, and driving means for driving the light source with recording power based on a pulse train signal including a pulse delayed by the delay means.

In the ninth invention, when forming one current recording mark, the length of the current recording mark and the length of the non-recording area immediately after the current recording mark are determined according to the desired length. The drive end time at the recording power of the light source for forming the current recording mark is changed.

As a means for realizing the ninth invention, a first measuring means for measuring the output period of the current recording signal, a second measuring means for measuring a no-signal period immediately after the current recording signal, A delay unit for delaying the current recording signal in accordance with both the measurement results of the first and second measuring units; and a delay unit from a rising edge of the recording signal before the delay to a falling edge of the recording signal after the delay by the delay unit. Driving means for driving the light source with the recording power.

In the tenth aspect, when forming one recording mark this time, the light source is driven with recording power a plurality of times in a time-division manner. At this time, at least the last driving of the plurality of driving of the light source depends on the length of the current recording mark and the length of the non-recording area immediately after the current recording mark. Change the end time.

As a means for realizing the tenth invention, a pulse train signal converting means for converting each one recording signal for recording optical information into a pulse train signal comprising a plurality of pulses, and an output period of the present recording signal , A second measuring means for measuring a no-signal period immediately after the current recording signal, and the pulse train signal in accordance with both measurement results of the first and second measuring means. A delay unit for delaying at least the last pulse of each pulse included in the pulse train signal obtained by the conversion unit; and driving the light source with the recording power based on the pulse train signal including the pulse delayed by the delay unit. And driving means for performing the driving.

In the eleventh invention, when forming one recording mark this time, the driving of the light source at the recording power of the light source for forming the current recording mark is started in accordance with the length of the current recording mark. The time is changed, and the drive end time at the recording power of the light source for forming the current recording mark is changed according to the length of the current recording mark.

As a means for realizing the eleventh invention, a first measuring means for measuring the output period of the present recording signal, and the present recording signal is delayed according to the measurement result of the first measuring means. A first delay unit, a second delay unit that delays a current recording signal in accordance with a measurement result of the first measurement unit, and a second delay unit that delays a rising edge of the recording signal after the delay by the first delay unit. And a driving unit for driving the light source with the recording power until the fall of the recording signal after the delay by the second delay unit.

In the twelfth aspect, when forming one recording mark this time, the light source is driven by the recording power a plurality of times in a time-division manner. Further, at that time, according to the length of the current recording mark, at least the first drive start time of the plurality of drives of the light source is changed, and
At least the last drive end time of the plurality of drives of the light source is changed according to the length of the current recording mark.

As a means for realizing the twelfth invention, a pulse train signal converting means for converting each recording signal for recording optical information into a pulse train signal composed of a plurality of pulses, and an output period of the present recording signal And a first delaying means for delaying at least a first pulse of each pulse included in the pulse train signal obtained by the pulse train signal converting means according to a measurement result of the first measuring means. According to the measurement result of the first measuring means,
Second delay means for delaying at least the last pulse of each pulse included in the pulse train signal obtained by the pulse train signal conversion means, and a pulse train including the pulses delayed by the first and second delay means Driving means for driving the light source with recording power based on the signal.

In the thirteenth aspect, when forming one recording mark this time, the driving of the light source at the recording power of the light source for forming the current recording mark is started in accordance with the length of the current recording mark. The time is changed, and the light source for forming the current recording mark is formed in accordance with the length of the current recording mark and the length of the non-recording area immediately after the current recording mark. Change the drive end time at the recording power.

As a means for realizing the thirteenth invention, a first measuring means for measuring the output period of the current recording signal, a second measuring means for measuring a non-signal period immediately after the current recording signal, First delay means for delaying the current recording signal in accordance with the measurement result of the first measurement means, and delaying the current recording signal in response to both measurement results of the first and second measurement means Second delay means for causing the light source to drive with the recording power from the rising edge of the recording signal after the delay by the first delay means to the falling edge of the recording signal after the delay by the second delay means. Is provided.

In the fourteenth aspect, when forming one recording mark this time, the light source is driven with the recording power a plurality of times in a time-division manner. Further, at that time, according to the length of the current recording mark, at least the first drive start time of the plurality of drives of the light source is changed, and
According to the desired length of the current recording mark and the desired length of the non-recording area immediately after the current recording mark,
At least the last drive end time of the plurality of drives of the light source is changed.

As a means for realizing the fourteenth invention, a pulse train signal converting means for converting one recording signal for recording optical information into a pulse train signal composed of a plurality of pulses, and an output period of the present recording signal , A second measuring means for measuring a no-signal period immediately after the current recording signal, and the pulse train signal converting means according to the measurement result of the first measuring means. A first delay unit for delaying at least the first pulse of each pulse included in the pulse train signal, and a pulse train signal conversion unit obtained in accordance with the measurement results of the first and second measurement units. A second delay unit that delays at least the last pulse of each pulse included in the pulse train signal; and a pulse train signal including the pulse delayed by the first and second delay units. Providing driving means for driving the light source by the recording power.

In the fifteenth aspect, when forming one current recording mark, the length of the area of the non-recording portion immediately before the current recording mark and the length of the current recording mark should be determined according to the length. The drive start time at the recording power of the light source for forming the current recording mark is changed, and the light source for forming the current recording mark is formed according to the length of the current recording mark. Change the drive end time at the recording power.

As a means for realizing the fifteenth invention, a first measuring means for measuring a non-signal period between a previous recording signal output and a current recording signal output, and a current recording signal A second measuring means for measuring an output period, a first delay means for delaying a current recording signal in accordance with both measurement results of the first and second measuring means, and a second measuring means for measuring the output period. A second delay unit for delaying the current recording signal in accordance with the measurement result; and a falling edge of the recording signal after the delay by the second delay unit from a rising edge of the recording signal after the delay by the first delay unit. And driving means for driving the light source with recording power.

In the sixteenth aspect, when forming one recording mark this time, the light source is driven by the recording power a plurality of times in a time-division manner. At this time, at least the first drive of the plurality of driving of the light source depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. Change the start time, and according to the length of the current recording mark,
At least the last drive end time of the plurality of drives of the light source is changed.

As a means for realizing the sixteenth invention, a pulse train signal converting means for converting one recording signal for recording optical information into a pulse train signal composed of a plurality of pulses, A first measuring means for measuring a no-signal period sandwiched before the output of the recording signal, a second measuring means for measuring an output period of the current recording signal, and the first and second measurements First delay means for delaying at least the first pulse of each pulse included in the pulse train signal obtained by the pulse train signal conversion means in accordance with both measurement results of the means, and measurement results of the second measurement means A second delay means for delaying at least the last pulse of each pulse included in the pulse train signal obtained by the pulse train signal conversion means,
Driving means for driving the light source with recording power based on a pulse train signal including a pulse delayed by the delay means.

According to the seventeenth aspect, when forming one recording mark this time, the length of the area of the non-recording portion immediately before the current recording mark and the length of the current recording mark should be determined according to the length. The drive start time at the recording power of the light source for forming the current recording mark is changed, and the length of the current recording mark and the area of the non-recording portion immediately after the current recording mark should be present. The drive end time at the recording power of the light source for forming the current recording mark is changed according to the length.

As a means for realizing the seventeenth invention, a first measuring means for measuring a non-signal period between a previous recording signal output and a current recording signal output, and a current recording signal A second measuring means for measuring an output period, a third measuring means for measuring a non-signal period between a current recording signal output and a next recording signal output, and the first and second measurement means. A first delay means for delaying the current recording signal in accordance with both measurement results of the measurement means, and a second delay means for delaying the current recording signal in accordance with both measurement results of the second and third measurement means. And delay means for driving the light source with the recording power from the rise of the recording signal after the delay by the first delay means to the fall of the recording signal after the delay by the second delay means. .

In the eighteenth aspect, when forming one recording mark this time, the light source is driven with recording power a plurality of times in a time-division manner. At this time, at least the first drive of the plurality of driving of the light source depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. The start time is changed, and at least the last drive of the plurality of drives of the light source is performed according to the length of the current recording mark and the length of the non-recording area immediately after the current recording mark. Change the end time.

As means for realizing the eighteenth aspect of the invention, a pulse train signal converting means for converting one recording signal for recording optical information into a pulse train signal comprising a plurality of pulses, A first measuring means for measuring a no-signal period sandwiched between the output of the recording signal, a second measuring means for measuring the output period of the current recording signal, and According to the third measuring means for measuring the no-signal period sandwiched between the output of the recording signal and the measurement results of the first and second measuring means,
The first delay means for delaying at least the first pulse of each pulse included in the pulse train signal obtained by the pulse train signal converting means, and the second and third measuring means, Second delay means for delaying at least the last pulse of each pulse included in the pulse train signal obtained by the pulse train signal conversion means;
And driving means for driving the light source with recording power based on a pulse train signal including a pulse delayed by the second delay means.

According to the nineteenth aspect, a recording waveform for forming a recording mark corresponding to an inversion interval T of modulation data is
First pulse followed by (T-Tmin) / T
It is composed of a plurality of pulse trains composed of w (Tmin is the minimum inversion interval, Tw is the detection window width) subsequent pulses, and the interval between the rising edge of the modulation data and the rising edge of the first pulse is x (0 <x ), The interval between the rise of the modulation data and the fall of the first pulse is Tmi
When n + y (y <0.5 Tw), x is set so that a mark with a maximum inversion interval is formed to a desired length, and a mark with a minimum inversion interval is formed to a desired length. The y is set as described above.

As means for realizing the nineteenth invention, a clock generator for generating a clock having a period of a detection window width, a modulator for modulating input data, and a pulse having a minimum inversion interval from the output of the modulator A first delay circuit that outputs a pulse obtained by delaying a rising edge of an output pulse of the pulse generation circuit; and a pulse that delays a falling edge of an output pulse of the first delay circuit. A second delay circuit that outputs a signal; a multi-pulse generation circuit that outputs a plurality of pulse trains using the output of the modulator, the output of the pulse generation circuit, and the clock; and an output of the second delay circuit and the multi-pulse. A logical sum circuit for outputting a logical sum with an output of the pulse generating circuit, a laser drive circuit for driving a laser of the optical head using an output of the logical sum circuit, By The driving circuit, and an optical head for recording signals on an optical disc having a recordable area.

In the first invention, when forming the current recording mark, the start time of light irradiation for forming the current recording mark is changed according to the length of the current recording mark. As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the length of the recording mark, so that the start end portion of the record mark can be formed at a correct position.

According to the second aspect of the present invention, since the light source such as a laser emits a pulse, when forming the current recording mark, the thermal effect at the time of forming the previous recording mark is reduced and the current recording mark is formed. The start time of at least the first pulse in the pulse emission for forming the current recording mark is changed in accordance with the length of the target recording mark. as a result,
Since the difference in the thermal history at the mark start part due to the length of the recording mark can be corrected, the start part of the record mark can be formed at a correct position.

According to the third aspect of the present invention, when forming the current recording mark, the current recording mark is determined according to the length of the non-recording portion immediately before the current recording mark and the length of the current recording mark. The start time of light irradiation for forming a mark is changed. As a result, it is possible to correct the influence of the heat at the time of forming the previous recording mark on the start end of the current recording mark, and to correct the difference in the heat history at the mark start end depending on the length of the current recording mark.
It is possible to form the starting end of the current recording mark at the correct position.

In the fourth aspect of the present invention, since the light source such as a laser emits a pulse, when forming the current recording mark, the thermal effect at the time of forming the previous recording mark is reduced and the current recording mark is formed. The start time of at least the first pulse in the pulse emission for forming the current recording mark is changed according to the desired length of the area of the non-recording portion immediately before and the desired length of the current recording mark. .
As a result, it is possible to correct the influence of the heat at the time of forming the previous recording mark on the start end of the current recording mark, and to correct the difference in the heat history at the mark start end depending on the length of the current recording mark. It is possible to form the starting end of the current recording mark at the correct position.

In the fifth invention, when forming the current recording mark, the length of the non-recording area immediately before the current recording mark, the length of the previous recording mark, and the current recording mark The start time of the light irradiation when the current recording mark is formed is changed according to the length that should be. As a result, it is possible to correct the influence of the heat at the time of forming the previous recording mark on the start end of the current recording mark, and to correct the difference in the heat history at the mark start end depending on the length of the current recording mark. It is possible to form the starting end of the current recording mark at the correct position.

According to the sixth aspect of the present invention, since the light source such as a laser emits a pulse light, when forming the current recording mark, the thermal effect at the time of forming the previous recording mark is reduced and the current recording mark is formed. In accordance with the desired length of the area of the non-recording portion immediately before and the desired length of the previous recording mark and the desired length of the current recording mark, at least the pulse emission for forming the current recording mark The start time of the first pulse is changed. As a result, it is possible to correct the influence of the heat at the time of forming the previous recording mark on the start end of the current recording mark, and to correct the difference in the heat history at the mark start end depending on the length of the current recording mark. It is possible to form the starting end of the current recording mark at the correct position.

In the seventh aspect, when forming the current recording mark, the end time of the light irradiation in forming the current recording mark is changed according to the length of the recording mark. As a result, it is possible to correct the difference in heat accumulation at the end of the mark due to the length of the recording mark, so that the end of the current recording mark can be formed at a correct position.

In the eighth aspect, since the light source such as a laser emits a pulse, the influence of heat upon forming the previous recording mark is reduced when forming the current recording mark, and the current recording mark is formed. The end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the desired length of the recording mark. as a result,
Since the difference in heat accumulation at the end of the mark due to the length of the recording mark can be corrected, the end of the current recording mark can be formed at the correct position.

According to the ninth aspect, when forming the current recording mark, the present recording mark is determined in accordance with the desired length of the current recording mark and the desired length of the non-recording area immediately after the current recording mark. The end time of the light irradiation when the recording mark is formed is changed. As a result, the difference in heat accumulation at the mark end due to the length of the recording mark and the difference in heat history at the mark end due to the distance to the next recording mark can be corrected. It becomes possible to form parts.

In the tenth aspect of the present invention, since the light source such as a laser emits a pulse light, when forming the current recording mark, the thermal effect at the time of forming the previous recording mark is reduced and the current recording mark is formed. The end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the desired length of the current recording mark and the desired length of the non-recording area immediately after the current recording mark. . As a result, the difference in heat accumulation at the mark end due to the length of the recording mark and the difference in heat history at the mark end due to the distance to the next recording mark can be corrected. It becomes possible to form parts.

In the eleventh invention, when forming the current recording mark, the length of the current recording mark should be
The start time of light irradiation when forming the current recording mark is changed, and the end time of light irradiation when forming the current recording mark is changed according to the length of the current recording mark. You. As a result, it is possible to correct the difference in heat history at the mark start end portion due to the length of the recording mark, and to correct the difference in heat accumulation at the mark end portion due to the length of the recording mark. The start and end portions can be formed.

In the twelfth aspect, since the light source such as a laser emits a pulse light, when forming the current recording mark, the thermal effect at the time of forming the previous recording mark is reduced and the current recording mark is formed. The start time of at least the first pulse in the pulse emission for forming the current recording mark is changed according to the desired length of the current recording mark, and the current recording time is changed according to the desired length of the current recording mark. The end time of at least the last pulse in the pulse emission for forming a mark is changed. As a result, it is possible to correct the difference in heat history at the mark start end portion due to the length of the recording mark, and to correct the difference in heat accumulation at the mark end portion due to the length of the recording mark. The start and end portions can be formed.

According to the thirteenth aspect, when forming the current recording mark, the length of the current recording mark should be
The start time of light irradiation when forming the current recording mark is changed, and according to the length of the current recording mark and the length of the non-recording area immediately after the current recording mark. Then, the end time of light irradiation for forming the current recording mark is changed. As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the length of the recording mark, and to correct the difference in the heat accumulation at the mark end portion due to the length of the recording mark, and the distance from the next recording mark. Can correct the difference in the thermal history at the mark end portion, so that the start and end portions of the current recording mark can be formed at the correct positions.

According to the fourteenth aspect, since the light source such as a laser emits a pulse light, when forming the current recording mark, the thermal effect at the time of forming the previous recording mark is reduced and the current recording mark is formed. The start time of at least the first pulse in the pulse emission for forming the current recording mark is changed according to the desired length of the current recording mark, and the desired length of the current recording mark and immediately after the current recording mark The end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the desired length of the non-recorded area. As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the length of the recording mark, and to correct the difference in the heat accumulation at the mark end portion due to the length of the recording mark, and the distance from the next recording mark. Can correct the difference in the thermal history at the mark end portion, so that the start and end portions of the current recording mark can be formed at the correct positions.

According to the fifteenth aspect, when forming the current recording mark, the present recording mark is determined according to the desired length of the area of the non-recording portion immediately before the current recording mark and the desired length of the current recording mark. The start time of light irradiation when forming the recording mark is changed, and the end time of light irradiation when forming the current recording mark is changed according to the length of the current recording mark. . As a result, it is possible to correct the thermal effect on the starting end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark starting end due to the length of the recording mark, and Since the difference in heat accumulation at the end of the mark due to the length of the mark can be corrected, the start and end of the current recording mark can be formed at the correct positions.

According to the sixteenth aspect, since the light source such as a laser emits a pulse, the thermal effect when the recording mark immediately before the current recording mark is formed is reduced when the current recording mark is formed. At the same time, at least the first pulse of the pulse emission for forming the current recording mark depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. The start time is changed, and the end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the length of the current recording mark. As a result, it is possible to correct the thermal effect on the starting end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark starting end due to the length of the recording mark, and Since the difference in heat accumulation at the end of the mark due to the length of the mark can be corrected, the start and end of the current recording mark can be formed at the correct positions.

In the seventeenth aspect, when the current recording mark is formed, the current recording mark is formed according to the desired length of the non-recording area immediately before the current recording mark and the desired length of the current recording mark. The start time of light irradiation when forming a recording mark is changed, and according to the length of the current recording mark and the length of the non-recording area immediately after the current recording mark, The end time of the light irradiation for forming the current recording mark is changed. As a result, it is possible to correct the thermal effect on the start end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark start end due to the length of the recording mark,
In addition, the difference in heat accumulation at the end of the mark due to the length of the recording mark can be corrected, and the difference in the heat history at the end of the mark due to the distance to the next mark can be corrected. Can be formed.

In the eighteenth aspect, since the light source such as a laser emits a pulse, when forming the current recording mark, the thermal effect when the recording mark immediately before the recording mark is formed is reduced. At the same time, at least the first pulse of the pulse emission for forming the current recording mark depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. The start time is changed, and pulse emission for forming the current recording mark is performed according to the desired length of the current recording mark and the desired length of the non-recording area immediately after the current recording mark. At least the end time of the last pulse is changed. As a result, it is possible to correct the thermal effect on the starting end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark starting end due to the length of the recording mark, and The difference between the heat accumulation at the end of the mark due to the length of the mark and the difference in the heat history at the end of the mark due to the distance to the next mark can be corrected. It becomes possible to form parts.

According to the nineteenth aspect, by delaying the rising edge of the first pulse, a recording mark corresponding to the maximum inversion interval can be formed to a desired length, and the falling edge of the first pulse is delayed. Thereby, a recording mark corresponding to the minimum inversion interval can be formed to a desired length.

[0068]

(Embodiment 1) Optical drive waveform 1 shown in FIG.
Reference numeral 16 denotes an optical drive waveform according to the first embodiment of the present invention.

The drive start time of the optical drive waveform 116 is delayed with respect to the recording signal 106.

In the case of (1, 7) modulation as an example, the delay amount is determined according to the length of the recording mark as shown in Table 1.

[0071]

[Table 1]

For example, the desired length of the recording mark 201 is T201 = 2Tw (Tw is the detection window width).
It is delayed by d1 (2) and the length of the recording mark 202 should be T202 = 8Tw, so it is delayed by d1 (8).

The shorter the recording mark length is, the easier it is to obtain the rapid cooling condition at the start of the mark. Therefore, when using a phase change medium that forms an amorphous mark by rapidly cooling after raising the temperature, the shorter the mark is, the shorter the starting mark is. The growth of is large. Therefore, d1 (2)> d
2 (3) >> ... d1 (8).

As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the recording mark length, and to correct the recording marks 201,
02 is formed at the correct position.

Here, the optical driving waveform 116 is driven between the recording power and the erasing power, but the light driving waveform 116 is driven between the recording power and the reproducing power or between the recording power and 0.
What is necessary is just to drive according to a recording medium.

FIG. 1 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to the first embodiment of the present invention.

In FIG. 1, reference numeral 101 denotes a clock generation circuit,
102, a channel clock signal; 103, a recording signal generation circuit; 104, a recording signal output from the recording signal generation circuit 103; 105, an H-level period length measurement circuit; Signal, 1
Reference numeral 07 denotes an H level period measurement result output, and reference numeral 108 denotes a delay circuit, which includes a memory 109 and a variable delay unit 111. 1
12 is a delay circuit output, 113 is an AND circuit, 114 is its output, 115 is a laser drive circuit, and 116 is an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 101 outputs a channel clock 102 having a cycle of the detection window width Tw. duty
(Duty) is variable.

The recording signal 104 output from the recording signal generating circuit 103 is input to the H level period length measuring circuit 105 in synchronization with the rising of the channel clock signal 102 from the clock generating circuit 101. The H-level period length measuring circuit 105 measures the length of the H-level period of the recording signal 104 and re-records the recording signal 106 and the measurement result 10.
7 is output. The measurement result 107 is output at the rise of the measured H level of the recording signal 106. That is,
If the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T201 is 2, and the measurement result 107 becomes 2 at the rise of T201. The length of the H level period T202 is 8, and the measurement result 107 becomes 8 at the rise of T202.

Then, the measurement result 107 is transmitted to the delay circuit 10
Enter 8

In the delay circuit 108, the measurement result 107 is input to the memory 109, and the memory output 1 is output from the memory 109.
10 is output. Here, as shown in Table 1, a value corresponding to the mark length to be recorded is stored in the memory 109, and a stored value corresponding to the measurement result 107 is output.

The variable delay unit 111 outputs the signal 112 by delaying the recording signal 106 in accordance with the memory output 110.

The recording signal 106 and the signal 112 are input to an AND circuit 113 and output as a signal 114.

The output signal 114 is output from the laser drive circuit 1
15, the light source is driven, and the light drive waveform 116
Thus, recording marks 201 and 202 are formed.

As described above, in the first embodiment, when the recording mark 201 or 202 is formed, the drive start time at the recording power of the light source is delayed according to the length of the recording mark to be recorded. The difference in the thermal history of the mark start part due to the length of the mark can be corrected,
The start end of the recording mark can be formed at a correct position.

In this case, the optical driving waveform is driven between the recording power and the erasing power. Good.

Embodiment 2 The optical drive waveform 323 in FIG.
9 is an optical drive waveform according to the second embodiment of the present invention.

The optical drive waveform 323 is composed of a plurality of pulses of a leading pulse and a multi-pulse. Further, the optical driving waveform 3
The start time of the first 23 pulses is delayed with respect to the recording signal 306.

The delay amount is determined according to the length of the recording mark, as shown in Table 2, in the case of (1, 7) modulation.

[0091]

[Table 2]

For example, the desired length of the recording mark 401 is T401 = 2Tw (Tw is the width of the detection window).
Since the length of the recording mark 402 should be T402 = 8Tw, the recording mark 402 is delayed by d2 (8).

The shorter the length of the mark to be recorded, the easier it is to obtain the quenching condition at the beginning of the mark. The start elongation is larger as it is. Therefore d2
(2)> d2 (3)>...> D2 (8).

As a result, it is possible to correct the difference in the thermal history of the mark start end portion due to the recording mark length, and to correct the recording marks 401 and 4.
02 is formed at the correct position.

Although the optical driving waveform is driven between the recording power and the erasing power here, it may be driven according to the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, and the like.

FIG. 3 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to the second embodiment of the present invention.

In FIG. 3, reference numeral 301 denotes a clock generation circuit,
302 is a channel clock signal, 303 is a recording signal generation circuit, 304 is a recording signal output from the recording signal generation circuit 303, 305 is an H level period length measurement circuit, and 306 is a recording after passing through the H level period length measurement circuit 305. Signal, 3
07 is an H level period length measurement result output, 308 is a delay circuit, 309 is a memory, 310 is a memory output, 311 is a variable delay device, 312 is a pulse division circuit, 313 is a leading pulse signal, 314 is a latter pulse signal, and 315 is a latter pulse signal. The multi-pulse generation circuit includes an inversion circuit 316 and an AND circuit 317 in this example. 318 is a multi-pulse signal, 3
19 is the output of the delay circuit 308, 320 is the OR circuit, 32
1 is an output signal, 322 is a laser drive circuit, and 323 is an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 301 outputs a clock 302 whose cycle is the detection window width Tw. The duty is variable.

The recording signal 304 output from the recording signal generating circuit 303 is input to the H level period length measuring circuit 305 in synchronization with the rise of the channel clock signal 302 from the clock generating circuit 301. The H-level period length measuring circuit 305 measures the length of the H-level period of the recording signal 304 and re-records the recording signal 306 and the measurement result 30.
7 is output. The measurement result 307 is output at the rise of the measured H level of the recording signal 306. That is,
If the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T401 is 2, and the measurement result 307 becomes 2 at the rise of T401. The length of the H level period T402 is 8, and the measurement result 307 becomes 8 at the rise of T402.

Then, the measurement result 307 is
Enter 8

In the delay circuit 308, the measurement result 307 is input to the memory 309, and is output from the memory 309 to the memory output 3
10 is output. Here, as shown in Table 2, the memory 309 stores a value corresponding to the length of the recording mark, and outputs a stored value corresponding to the measurement result 307.

The memory output 310 is input to the variable delay 311.

On the other hand, the recording signal 306 output from the H level period length measuring circuit 305 is input to the pulse dividing circuit 312, and the leading pulse signal 313 and the latter half pulse signal 3
14 is divided.

The head pulse 313 is a signal which rises at the rise of the recording signal 306 and falls after Tw.

The second half pulse 314 is a signal which rises Tw after the rise of the recording signal 306 and falls at the fall of the recording signal 306.

The leading pulse signal 313 is input to the delay unit 311, delayed and output as a signal 319.

The second half pulse signal 314 is input to the multi-pulse generation circuit 315, and is output as a multi-pulse 318.

The signal 319 and the multi-pulse 318 are added by the OR circuit 320 and output as a signal 321.

The signal 321 is input to the laser drive circuit 322 to form an optical drive waveform 323, and the recording marks 401, 4
02 is formed.

As described above, in the second embodiment, when forming the recording marks 401 and 402, the light source emits a pulse light a plurality of times, and the pulse light emission is performed a plurality of times according to the length of the recording mark. Since the time of the first pulse emission is delayed, the difference in heat history at the mark start end portion due to the length of the recording mark can be corrected, and the start end portion of the recording mark can be formed at a correct position. In addition, since light is emitted in a pulsed form, the heat load applied to the medium is reduced, and there is an effect that deterioration due to repeated recording is reduced.

(Embodiment 3) The optical drive waveform 518 in FIG.
9 is an optical drive waveform according to a third embodiment of the present invention.

The drive start time of the optical drive waveform 518 is delayed with respect to the recording signal 508.

As shown in Table 3, if the (1, 7) modulation is taken as an example, the delay amount is a combination of the desired length of the current recording mark and the desired length of the non-recording portion immediately before. Determined accordingly.

[0115]

[Table 3]

For example, the desired length of the mark 601 is T602 = 5Tw (Tw is the detection window width), and the immediately preceding non-recording period is T601 = 2Tw. Therefore, the light drive waveform is d3 (2,5) only. The length of the mark 602 should be T604 = 8Tw, and the immediately preceding non-recording period is T60.
Since 3 = 6Tw, the optical drive waveform is delayed by d3 (6, 8).

If the length of the mark to be recorded is the same, the smaller the length of the immediately preceding non-recorded portion, the greater the thermal effect of the previous recording power, and the more likely the temperature at the beginning of the mark to rise. Becomes larger. Therefore, d3
(2, N)> d3 (3, N) >> ... d3 (8, N)
(N is an integer of 2 to 8).

If the length of the immediately preceding non-recording portion is the same, the shorter the mark length to be recorded this time, the easier it is to obtain the rapid cooling condition at the mark start end portion. When a phase change medium that forms an amorphous mark is used, the shorter the mark, the greater the extension of the starting end. Therefore d
3 (N, 2)> d3 (N, 3) >>...> d3 (N,
8) (N is an integer from 2 to 8).

As a result, it is possible to correct the difference in the thermal effect of the recording power having formed the immediately preceding recording mark on the start end of the current recording mark due to the length of the immediately preceding non-recording portion, and to improve the mark by the recording mark length. The difference in the thermal history of the start portions can also be corrected, and the start portions of the recording marks 601 and 602 are formed at correct positions.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

FIG. 5 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to the third embodiment of the present invention.

In FIG. 5, reference numeral 501 denotes a clock generation circuit,
502 is a channel clock signal, 503 is a recording signal generation circuit, 504 is a recording signal output from the recording signal generation circuit 503, 505 is an L level period length measurement circuit, 506 is a measurement result output, 507 is an H level period length measurement circuit,
508 is a recording signal after passing through the H level period length measuring circuit 507, 509 is an H level period length measurement result output, 510 is a delay circuit, 511 is a memory, 512 is a memory output, 51
3 is a variable delay, 514 is a delay output, 515 is an AND circuit, 516 is its output, 517 is a laser drive circuit, 5
Reference numeral 18 denotes an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 501 outputs a channel clock 502 having a cycle of the detection window width Tw. dut
y is variable.

In synchronization with the rise of the channel clock signal 502 from the clock generation circuit 501, the recording signal 504 output from the recording signal generation circuit 503 includes an L level period length measurement circuit 505 and an H level period length measurement circuit 5
07.

The L level period length measuring circuit 505 measures the L level period length of the recording signal 504, and outputs a measurement result 506 at the rise of the H level following the measured L level. That is, if the length of the L-level period is represented by the number of channel clocks, the L-level period T601
Is 2 and the measurement result 5 at the rise of T602
06 becomes 2, the length of the L-level period T603 is 6, and the measurement result 506 becomes 6 at the rise of T604.

The H level period length measuring circuit 507 measures the H level period length of the recording signal 504, and outputs a measurement result 509 at the rise of the measured H level. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T602 is 5
At the rise of T602, the measurement result 509 becomes 5, the length of the H level period T604 is 8, and
At the rise of 4, the measurement result 509 becomes 8.

The measurement results 506 and 509 are input to the delay circuit 510.

In the delay circuit 510, the measurement results 506, 5
09 is input to the memory 511, and the memory 511 outputs a memory output 512. Here, as shown in Table 3, the memory 511 corresponds to the combination of the length of the immediately preceding non-recorded portion (corresponding to the measurement result 506) and the length of the current recording mark (corresponding to the measurement result 509). And the corresponding stored value is output.

The variable delay unit 513 delays the recording signal 508 according to the memory output 512 and outputs a signal 514.

The recording signal 508 and the signal 514 are input to an AND circuit 515 and output as a signal 516.

This output signal 516 is output from the laser drive circuit 5.
17, the light source is driven, and the light drive waveform 518 is input.
Thus, recording marks 601 and 602 are formed.

As described above, in the third embodiment, when the recording mark 601 or 602 is formed, the recording of the light source is performed in accordance with the length of the non-recording portion that should be immediately before and the recording length of the current recording mark. Delay the drive start time by power. As a result, it is possible to correct the difference in the thermal effect of the recording power having formed the immediately preceding recording mark on the starting end of the current recording mark due to the length of the immediately preceding non-recording portion, and also to correct the difference between the mark starting end due to the recording mark length. The difference between the thermal histories can also be corrected, and the start ends of the recording marks 601 and 602 are formed at correct positions.

In this case, the optical drive waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 4) The optical drive waveform 725 of FIG.
14 is an optical drive waveform in Example 4 of the present invention.

The optical drive waveform 725 includes a leading pulse and a multi-pulse. Further, the drive start time is determined by the recording signal 70.
Late from 8. In the case of (1, 7) modulation as an example, the delay amount corresponds to the combination of the desired length of the current recording mark and the desired length of the non-recording portion immediately before, as shown in Table 4. I can decide.

[0137]

[Table 4]

For example, the desired length of the mark 801 is T802 = 5Tw (Tw is the detection window width), and the last non-recording period is T801 = 2Tw, so that the optical drive waveform is only d4 (2,5). The length of the mark 802 should be T804 = 8Tw, and the immediately preceding non-recording period is T80.
Since 3 = 6Tw, the optical drive waveform is delayed by d4 (6, 8).

If the length of the mark to be recorded is the same, the smaller the length of the immediately preceding non-recorded portion, the greater the thermal effect of the previous recording power and the more likely the temperature to rise at the beginning of the mark. Becomes larger. Therefore, d4
(2, N)> d4 (3, N) >>...> d4 (8, N)
(N is an integer from 2 to 8).

If the length of the immediately preceding non-recorded portion is the same, the shorter the mark length to be recorded this time, the easier it is to obtain the rapid cooling condition at the mark start end portion. When a phase change medium that forms an amorphous mark is used, the shorter the mark, the greater the extension of the starting end. Therefore d
4 (N, 2)> d4 (N, 3) >> ... d4 (N,
8).

As a result, it is possible to correct the difference in the thermal effect of the recording power having formed the immediately preceding recording mark on the start end portion of the current recording mark due to the length of the immediately preceding non-recording portion, and the mark due to the recording mark length. The difference in the thermal history at the start ends can also be corrected, and the start ends of the recording marks 801 and 802 are formed at the correct positions.

In this case, the optical drive waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

FIG. 7 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 4 of the present invention.

In FIG. 7, reference numeral 701 denotes a clock generation circuit,
702 is a channel clock signal, 703 is a recording signal generation circuit, 704 is a recording signal output from the recording signal generation circuit 703, 705 is an L level period length measuring circuit, 706 is a measurement result output, 707 is an H level period length measurement circuit,
708 is a recording signal after passing through the H level period length measuring circuit 707, 709 is an H level period length measurement result output, 710 is a delay circuit block, 711 is a memory, 712 is a memory output, 713 is a variable delay device, and 714 is a pulse. Dividing circuit, 7
15 is the first pulse signal, 716 is the second pulse signal, 71
Reference numeral 7 denotes a multi-pulse generation circuit, which includes an inversion circuit 718 and an AND circuit 719.

Reference numeral 720 denotes a multi-pulse, 721 denotes a delay unit output, 722 denotes an OR circuit, 723 denotes its output, 724 denotes a laser drive circuit, and 725 denotes an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 701 outputs a channel clock 702 having a cycle of the detection window width Tw. duty
Is variable.

In synchronization with the rise of the channel clock signal 702 from the clock generation circuit 701, the recording signal 704 output from the recording signal generation circuit 703 includes an L level period length measurement circuit 705 and an H level period length measurement circuit 7
07.

The H-level period length measuring circuit 707 outputs a recording signal 708 again.

The L level period length measuring circuit 705 measures the L level period length of the recording signal 704, and outputs a measurement result 706 at the rise of the H level following the measured L level. That is, if the length of the L-level period is represented by the number of channel clocks, the L-level period T801
Is 2 and the measurement result 7 at the rise of T802
06 becomes 2, the length of the L level period T803 is 6, and the measurement result 706 becomes 6 at the rise of T804.

The H level period length measuring circuit 707 measures the H level period length of the recording signal 704, and outputs a measurement result 709 at the measured rise of the H level. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T802 is 5
At the rise of T802, the measurement result 709 becomes 5, the length of the H level period T804 is 8, and
At the rise of 4, the measurement result 709 becomes 8.

The measurement results 706 and 709 are input to the delay circuit 710.

In the delay circuit 710, the measurement results 706, 7
09 is input to the memory 711, and the memory 711 outputs a memory output 712. Here, as shown in Table 4, the memory 711 corresponds to the combination of the length of the immediately preceding non-recorded portion (corresponding to the measurement result 706) and the length of the current recording mark (corresponding to the measurement result 709). And the corresponding stored value is output.

On the other hand, the recording signal 708 is input to the pulse dividing circuit 714, and the first pulse 715 having the pulse width Tw is supplied.
Is divided into the latter half pulse 716.

The leading pulse 715 is delayed by the variable delay 713 in accordance with the memory output 712, and becomes a signal 721.

The second half pulse signal 716 is input to the multi-pulse generation circuit 717, and becomes a multi-pulse 720.

The signal 721 and the multipulse 720 are input to an OR circuit 722 and output as a signal 723.

This output signal 723 is output from the laser drive circuit 7.
24, the light source is driven, and the light drive waveform 725
Thus, recording marks 801 and 802 are formed.

As described above, in the fourth embodiment, when forming the recording mark 801 or 802, the recording power is driven in the form of a plurality of pulses consisting of a leading pulse and a multi-pulse, and the length of the non-recording portion that should be immediately before is recorded. The drive start time of the first pulse is delayed according to the length of the current recording mark to be recorded. As a result, it is possible to correct the difference in the thermal effect of the recording power having formed the immediately preceding recording mark on the starting end of the current recording mark due to the length of the immediately preceding non-recording part, and to correct the difference between the mark starting end due to the recording mark length. Differences in heat history can be corrected, and recording marks 801 and 8
02 is formed at the correct position. Further, by driving in a pulse shape, the heat load applied to the medium is reduced, and there is an effect that deterioration due to repeated recording is reduced.

In this case, the optical drive waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 5) Optical drive waveform 920 of FIG.
7 shows an optical drive waveform according to the fifth embodiment of the present invention.

The drive start time of the optical drive waveform 920 is delayed with respect to the recording signal 910.

As shown in Table 5, when the (1, 7) modulation is taken as an example, the delay amount is the length of the last recorded mark and the length of the non-recorded portion immediately before the current mark. And the length of the current recording mark.

[0164]

[Table 5]

For example, the desired length of the mark 1001 is T1003 = 5Tw (Tw is the detection window width), the immediately preceding non-recording period is T1002 = 2Tw, and the previous recording mark is T1001 = 3Tw. The optical drive waveform is delayed by d5 (3, 2, 5), the desired length of the mark 1002 is T1005 = 8Tw, the immediately preceding non-recording period is T1004 = 6Tw, and the previous recording mark is T1.
Since 003 = 5Tw, the optical driving waveform is d5 (5,5
6, 8).

If the length of the mark to be recorded is the same and the length of the immediately preceding non-recording portion is the same, the larger the previous recording mark, the greater the thermal effect of the previous recording power, and the temperature at the mark start end rises. Easy, the elongation of the starting end becomes large. Therefore, d5 (8, N, M)> d5 (7, N,
M) >> ... d5 (2, N, M) (N and M are 2 to 8
Is an integer).

If the length of the mark to be recorded is the same and the length of the previous recording mark is the same, the smaller the length of the immediately preceding non-recording portion, the greater the thermal effect due to the previous recording power, and Since the temperature easily rises, the start of the mark this time has a large extension. Therefore, d5 (N, 2, M)
> D5 (N, 3, M) >> ... d5 (N, 8, M)
(N and M are integers from 2 to 8).

If the length of the previous recorded mark is the same and the length of the immediately preceding non-recorded portion is the same, the shorter the length of the mark to be recorded this time, the easier it is to obtain the rapid cooling condition at the start of the mark. When a phase change medium that forms an amorphous mark by quenching after temperature rise is used, the shorter the mark, the greater the extension of the starting end. Therefore, d5 (N, M, 2)> d5 (N,
M, 3) >> ... d5 (N, M, 8), (N, M is 2
To an integer of 8).

As a result, it is possible to correct the difference between the length of the previous recording mark and the difference between the length of the previous non-recording portion and the difference in the thermal effect of the recording power having formed the previous recording mark on the start end of the current recording mark. In addition, it is possible to correct the difference in the thermal history of the mark start end portion due to the recording mark length, and the start end portions of the recording marks 1001 and 1002 are formed at correct positions.

In this case, the optical driving waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

FIG. 9 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 5 of the present invention.

In FIG. 9, reference numeral 901 denotes a clock generation circuit;
902 is a channel clock signal, 903 is a recording signal generation circuit, 904 is a recording signal output from the recording signal generation circuit 903, 905 is an H level period length measurement circuit 1, 906
Is the measurement result output, 907 is the L level period length measurement circuit, 908 is the measurement result output, 909 is the H level period length measurement circuit 2, 910 is the recording signal after passing through the H level period length measurement circuit 2, 911 is The measurement result output of the H level period length measurement circuit 2, 912 is a delay circuit, 913 is a memory, 9
14 is a memory output, 915 is a variable delay, 916 is its output, 917 is an AND circuit, 918 is its output, 919
Denotes a laser drive circuit, and 920 denotes an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 901 outputs a channel clock 902 having a cycle of the detection window width Tw. duty
Is variable.

The recording signal 904 output from the recording signal generation circuit 903 in synchronization with the rise of the channel clock signal 902 from the clock generation circuit 901 is supplied to the H level period length measurement circuit 1 (905) and the L level period length. It is input to the measurement circuit 907 and the H level period length measurement circuit 2 (909).

The H-level period length measuring circuit 1 (905)
The H level period length of the recording signal 904 is measured, and the result 906
At the next rising of the H level. That is, H
If the length of the level period is represented by the number of channel clocks, the length of the H-level period T1001 is 3, 3 is output at the next rising edge of the H-level period T1003, and the length of the H-level period T1003 Is 5, and 5 is output at the rise of the next H-level period T1005.

The L-level period length measuring circuit 907 measures the L-level period length of the recording signal 904, and outputs the result 908 to the L level.
The signal is output at the rising of the H level following the level. That is, if the length of the L-level period is represented by the number of channel clocks, the length of the L-level period T1002 is 2, and 2 is output at the next rise of the H-level period T1003, and the L-level period T1004 Has a length of 6
And 6 at the rise of the next H level period T1005.
Is output.

The H level period length measurement circuit 2 (909)
The H level period length of the recording signal 904 was measured, and the result 911
At the rise of the H level. That is, H
If the length of the level period is represented by the number of channel clocks, the length of the H level period T1003 is 5, and 5 is output at the rise of the H level period T1003, and the length of the H level period T1005 is 8 is output at the rise of the H-level period T1005.

The measurement results 906, 908, and 911 are input to the delay circuit 912.

In the delay circuit 912, the measurement results 906, 9
08 and 911 are input to the memory 913,
Outputs a memory output 914. Here the memory 91
In Table 3, as shown in Table 5, the length of the previous recording mark (corresponding to the measurement result 906) and the length of the non-recording portion immediately before the current recording mark (corresponding to the measurement result 908)
A value is stored corresponding to a combination of the desired length of the current recording mark (corresponding to the measurement result 911), and the corresponding stored value is output.

The variable delay unit 915 delays the recording signal 910 according to the memory output 914 and outputs a signal 916.

A recording signal 910 and a signal 916 are input to an AND circuit 917 and output as a signal 918.

The output signal 918 is output from the laser drive circuit 9
19, the light source is driven, and the light drive waveform 920
Thus, recording marks 1001 and 1002 are formed.

As described above, in the fifth embodiment, when the recording mark 1001 or 1002 is formed, the length of the previous recording mark, the length of the non-recording portion immediately before the current recording mark, and the current recording mark The drive start time at the recording power of the light source is delayed according to the combination of the lengths of the marks to be recorded. As a result, it is possible to correct the difference between the previous mark length and the difference between the length of the non-recording portion immediately before the current recording mark, and the difference in the thermal effect of the recording power that formed the previous recording mark on the start end of the current recording mark. In addition, since the difference in the thermal history of the mark start end portion due to the recording mark length can be corrected, the recording marks 1001,
The starting portion of 1002 is formed in the correct position.

In this case, the optical drive waveform is driven between the recording power and the erasing power. However, if it is driven according to the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 6) Optical drive waveform 1127 shown in FIG.
8 shows an optical driving waveform according to the sixth embodiment of the present invention.

The light drive waveform 1127 is composed of a leading pulse and a multi-pulse. Further, in the optical drive waveform 1127, the drive start time is delayed with respect to the recording signal 1110.

In the case of (1, 7) modulation as an example, as shown in Table 6, the delay amount should be the length of the previous recording mark and the length of the non-recording portion immediately before the current mark. And the length of the current recording mark.

[0189]

[Table 6]

For example, the desired length of the mark 1201 is T1203 = 5Tw (Tw is the detection window width), the immediately preceding non-recording period is T1202 = 2Tw, and the previous recording mark is T1201 = 3Tw. The optical drive waveform is delayed by d6 (3, 2, 5), the desired length of the mark 1202 is T1205 = 8Tw, the immediately preceding non-recording period is T1204 = 6Tw, and the previous recording mark is T1.
Since 203 = 5Tw, the optical drive waveform is d6 (5,
6, 8).

If the length of the mark to be recorded is the same and the length of the immediately preceding non-recorded portion is the same, the larger the previous recorded mark, the greater the thermal effect of the previous recording power, and the temperature at the mark start end rises. Easy, the elongation of the starting end becomes large. Therefore, d6 (8, N, M)> d6 (7, N,
M) >> ... d6 (2, N, M) (N and M are 2 to 8
Integer).

If the length of the mark to be recorded is the same and the length of the previous recorded mark is the same, the smaller the length of the immediately preceding non-recorded portion, the greater the thermal effect of the previous recording power, and the larger the mark start end. Since the temperature easily rises, the start of the mark this time has a large extension. Therefore, d6 (N, 2, M)
> D6 (N, 3, M) >> ... d6 (N, 8, M)
(N and M are integers from 2 to 8).

If the length of the previous recorded mark is the same and the length of the immediately preceding non-recorded portion is the same, the shorter the length of the mark to be recorded this time, the easier it is to obtain the rapid cooling condition at the mark start end. When a phase change medium that forms an amorphous mark by quenching after temperature rise is used, the shorter the mark, the greater the extension of the starting end. Therefore, d6 (N, M, 2)> d6 (N,
M, 3) >> ... d6 (N, M, 8).

As a result, it is possible to correct the difference between the length of the previous recording mark and the difference between the length of the immediately preceding non-recording portion and the difference in the thermal effect of the recording power having formed the previous recording mark on the start end of the current recording mark. In addition, it is possible to correct the difference in the thermal history of the mark start end portion due to the recording mark length, and the start end portions of the recording marks 1001 and 1002 are formed at correct positions.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

FIG. 11 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 6 of the present invention.

In FIG. 11, reference numeral 1101 denotes a clock generation circuit; 1102, a channel clock signal; 1103, a recording signal generation circuit; 1104, a recording signal output from the recording signal generation circuit 1103; Is a measurement result output, 1107 is an L level period length measurement circuit, 1108 is a measurement result output, 1
Reference numeral 109 denotes an H-level period length measurement circuit 2; 1110, a recording signal after passing through the H-level period length measurement circuit 2;
The measurement result output of the level period length measurement circuit 2, 1112 is a delay circuit, 1113 is a memory, 1114 is a memory output,
115 is a variable delay device, 1116 is a pulse division circuit, 11
17 is the first pulse signal, 1118 is the latter pulse signal, 1
Reference numeral 119 denotes a multi-pulse generation circuit, and the inversion circuit 112
0 and an AND circuit 1121.

Reference numeral 1122 denotes a multipulse, 1123 denotes a variable delay output, 1124 denotes an OR circuit, 1125 denotes its output, 1126 denotes a laser drive circuit, and 1127 denotes an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 1101 outputs a channel clock 1102 having a cycle of the detection window width Tw. du
ty is variable.

The recording signal 1104 output from the recording signal generation circuit 1103 in synchronization with the rise of the channel clock signal 1102 from the clock generation circuit 1101
Are input to the H-level period length measurement circuit 1 (1105), the L-level period length measurement circuit 1107, and the H-level period length measurement circuit 2 (1109).

H level period length measuring circuit 1 (1105)
Measures the length of the H level period of the recording signal 1104, and outputs the result 1106 at the next rising of the H level. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T1201 is 3, and 3 is output at the next rising of the H-level period T1203, and the H-level period T1203 is output. Is 5, and is output at the rising edge of the next H-level period T1205.

The L level period length measuring circuit 1107 measures the L level period length of the recording signal 1104, and outputs the result 1108 at the rising of the H level following the L level. That is, if the length of the L-level period is represented by the number of channel clocks, the L-level period T120
The length of 2 is 2, 2 is output at the rising edge of the next H-level period T1203, and the length of L-level period T1204 is 6, and 6 is output at the rising edge of the next H-level period T1205.

H level period length measuring circuit 2 (1109)
Measures the length of the H level period of the recording signal 1104, and outputs the result 1111 in synchronization with the rise of the H level. That is, if the length of the H-level period is represented by the number of channel clocks, the H-level period T120
The length of 3 is 5, and 5 is output at the rise of the H-level period T1203. The length of the H-level period T1205 is 8, and 8 is output at the rise of the H-level period T1205.

Then, the measurement results 1106, 1108, 11
11 is input to the delay circuit 1112.

In the delay circuit 1112, the measurement result 110
6, 1108 and 1111 are input to the memory 1113,
The memory output 1114 is output from the memory 1113.
As shown in Table 6, the memory 1113 stores the length of the previous recording mark (corresponding to the measurement result 1106) and the length of the non-recording portion immediately before the current recording mark (corresponding to the measurement result 1108). A value is stored corresponding to a combination of the corresponding recording mark and the length of the current recording mark (corresponding to the measurement result 1111), and the corresponding stored value is output.

On the other hand, the recording signal 1110 is divided into a first pulse 1117 and a second half pulse 1118 by a pulse dividing circuit 1116.
Is divided into

The first pulse is a signal which rises at the rise of the recording signal 1110 and falls after Tw, and the second half pulse is a signal which rises Tw after the rise of the recording signal 1110 and falls at the fall of the recording signal 1110.

[0209] The latter half pulse 1118 is input to the multi-pulse generation circuit 1119, and the multi-pulse 1122 is output.

The leading pulse 1117 is supplied to the variable delay unit 111
5, the delayed signal 112 according to the memory output 1114.
It becomes 3.

The multi-pulse 1122 and the signal 1123 are O
The signal is input to an R circuit 1124 and output as a signal 1125.

The output signal 1125 is input to the laser drive circuit 1126 to drive the light source and generate the light drive waveform 1
127, and recording marks 1201 and 1202 are formed.

As described above, in the sixth embodiment, when the recording mark 1201 or 1202 is formed, the light source emits light in a pulse shape, and the length of the previous recording mark and the length of the previous recording mark should be determined. The drive start time of the leading pulse is delayed according to the combination of the length of the recording portion and the length of the current recording mark to be recorded. As a result, it is possible to correct the difference between the previous mark length and the difference between the length of the non-recording portion immediately before the current recording mark, and the difference in the thermal effect of the recording power that formed the previous recording mark on the start end of the current recording mark. In addition, since the difference in the thermal history of the mark start end portion due to the recording mark length can be corrected, the start end portions of the recording marks 1201 and 1202 are formed at correct positions. Further, by driving in a pulse shape, the heat load applied to the medium can be reduced, and there is an effect that deterioration due to repeated recording is reduced.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 7) Optical drive waveform 1318 in FIG.
7 shows an optical driving waveform according to the seventh embodiment of the present invention.

The optical drive waveform 1318 is the same as the recording signal 1306
Is delayed by a fixed amount K with respect to a reference signal 1314,
The drive end time is earlier.

The change amount is determined according to the length of a recording mark to be recorded as shown in Table 7 in the case of (1, 7) modulation as an example.

[0218]

[Table 7]

For example, the length of the recording mark 1401 to be recorded is T1401 = 2 Tw (Tw is the width of the detection window).
2 is the length to be recorded is T1402 = 8Tw,
The processing ends earlier by d7 (8).

As the length of a mark to be recorded is longer, the influence of heat accumulation at the end of the mark is greater, and the extension of the end is greater. Therefore, d7 (8)> d7 (7) >> ... d
7 (2).

As a result, it is possible to correct the difference in heat accumulation at the end of the mark due to the length of the recording mark.
The end portion of 1402 is formed in the correct position.

Although the optical driving waveform 1318 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 13 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 7 of the present invention.

In FIG. 13, reference numeral 1301 denotes a clock generation circuit; 1302, a clock signal; 1303, a recording signal generation circuit; 1304, a recording signal output from the recording signal generation circuit 1303;
306 is a recording signal after passing through the H level period length measuring circuit 1305, 1307 is an H level period measurement result output, 130
8 is a delay circuit, 1309 is a memory, 1310 is a memory output, 1311 is a variable delay, 1312 is a variable delay output, 1313 is a fixed delay, 1314 is its output, 1313
Reference numeral 15 denotes an AND circuit, 1316 denotes its output, 1317 denotes a laser drive circuit, and 1318 denotes an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 1301 outputs a channel clock 1302 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 1304 output from the recording signal generating circuit 1303 in synchronization with the rise of the channel clock signal 1302 from the clock generating circuit 1301
Is input to the H-level period length measurement circuit 1305. H
The level period length measurement circuit 1305 detects the H level of the recording signal 1304.
The length of the level period is measured, and the recording signal 130 is renewed.
6 and the measurement result 1307 are output. Measurement result 1307
Is output in synchronization with the rising of the measured H level of the recording signal 1306. That is, if the length of the H level period is expressed by the number of channel clocks, H
The length of the level period T1401 is 2, and the measurement result 13
07 is 2 at the rise of the H-level period T1401, the length of the H-level period T1402 is 8, and the measurement result 1307 is 8 at the rise of the H-level period T1402.

The measurement result 1307 indicates that the delay circuit 1
Input to 308.

In delay circuit 1308, measurement result 1307
Is input to the memory 1309, and the memory 1309 outputs a memory output 1310. Here, as shown in Table 7, a value corresponding to the length of the current recording mark (corresponding to the measurement result 1307) is stored in the memory 1309, and the stored value corresponding to the measurement result 1307 is output. Is done.

The variable delay unit 1311 has a memory output 1310
, The recording signal 1306 is delayed and a signal 1312 is output.

On the other hand, the recording signal 1306 passes through a fixed delay unit 1313 having a delay amount K, and an output 131 delayed by K
It becomes 4.

The output 1312 and the output 1314 are input to an AND circuit 1315 and output as a signal 1316.

The output signal 1316 is input to the laser drive circuit 1317 to drive the light source and generate the light drive waveform 1
318, and recording marks 1401 and 1402 are formed.

As described above, in the seventh embodiment, when the recording mark 1401 or 1402 is formed, the drive with the recording power of the light source is terminated early according to the length of the recording mark to be recorded. The difference in heat accumulation at the end of the mark due to the length of the mark can be corrected,
The end portion of the recording mark can be formed at a correct position.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, for example, between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 8) Optical drive waveform 1538 in FIG.
8 shows an optical drive waveform according to the eighth embodiment of the present invention.

[0237] The light drive waveform 1538 is composed of a plurality of pulses. Further, the optical drive waveform 1538 has the drive end time of the last pulse earlier with reference to the signal 1600 obtained by delaying the recording signal 1506 by a fixed amount K.

The change amount is determined in correspondence with the length of a recording mark to be recorded, as shown in Table 8, in the case of (1, 7) modulation as an example.

[0239]

[Table 8]

For example, since the length of the recording mark 1601 to be recorded is T1601 = 2 Tw (Tw is the width of the detection window), only d8 (2) ends quickly, and the recording mark 1601 ends.
Since the length to be recorded in No. 2 is T1602 = 8Tw,
The processing ends earlier by d8 (8).

As the length of a mark to be recorded is longer, the influence of heat accumulation at the end of the mark is greater, and the extension of the end is greater. Therefore, d8 (8)> d8 (7) >> ... d
8 (2).

As a result, the difference in heat accumulation at the end of the mark due to the recording mark length can be corrected.
The terminal portion of 1602 is formed in the correct position.

Although the optical driving waveform 1538 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 15 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 8 of the present invention.

In FIG. 15, reference numeral 1501 denotes a clock generation circuit; 1502, a clock signal; 1503, a recording signal generation circuit; 1504, a recording signal output from the recording signal generation circuit 1503;
506 is a recording signal after passing through the H level period length measuring circuit 1505, 1507 is an H level period measurement result output, 150
8 is a pulse dividing circuit, 1509 is a leading pulse, 1510
Is an intermediate pulse, 1511 is a last pulse, 1512 is a fixed delay, 1513 is its output, 1514 is a multi-pulse generation circuit, 1515 is an inversion circuit, 1516 is an AND circuit, 1517 is an intermediate multi-pulse, 1518 is a fixed delay, 1519 Is the output, 1520 is a multi-pulse generation circuit, 1521 is an inversion circuit, 1522 is an AND circuit,
523 is a last multi circuit, 1524 is a selector, 15
25 is its output, 1526 is a delay circuit, 1527 is a memory, 1528 is a memory output, 1529 is a variable delay, 1
530 is its output, 1531 is its OR circuit, 1532 is its output, 1533 is its AND circuit, 1534 is its output,
1535 is a selector, 1536 is its output, 1537 is a laser drive circuit, 1538 is an optical drive waveform, 1539 is a gate generation circuit, 1540 is its output, 1541 is a switch, and 1542 is a select signal. Here, the selectors 1524 and 1535 select and output the X input when the select signal 1542 is at the L level, and select and output the Y input when the select signal 1542 is at the H level.

First, the operation when switch 1541 is OFF, that is, when select signal 1542 is at L level will be described with reference to the timing chart of FIG.

The clock generation circuit 1501 outputs a channel clock 1502 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 1504 output from the recording signal generation circuit 1503 in synchronization with the rise of the channel clock signal 1502 from the clock generation circuit 1501
Is input to the H-level period length measurement circuit 1505. H
The level period length measuring circuit 1505 detects the H level of the recording signal 1504.
The length of the level period is measured, and the recording signal 150 is renewed.
6 and the measurement result 1507 are output. Measurement result 1507
Is output in synchronization with the rising of the measured H level of the recording signal 1506. That is, if the length of the H level period is expressed by the number of channel clocks, H
The length of the level period T1601 is 2, and the measurement result 15
07 is 2 at the rise of the H-level period T1601, the length of the H-level period T1602 is 8, and the measurement result 1507 is 8 at the rise of the H-level period T1602.

The measurement result 1507 indicates that the delay circuit 1
526 is input. Measurement result 1 in delay circuit 1526
507 is input to the memory 1527, and a memory output 1528 is output from the memory 1527. Here memory 15
27 stores a value corresponding to the length of the current recording mark (corresponding to the measurement result 1507) as shown in Table 8, and the stored value corresponding to the measurement result 1507 is output.

On the other hand, the recording signal 1506 is divided by a pulse dividing circuit 1508 into a leading pulse 1509 and an intermediate pulse 151.
It is divided into 0 and the last pulse 1511. In this example, the first pulse 1509 rises at the rise of the recording signal 1506 and falls after Tw, and the intermediate pulse 1510 rises Tw after the rise of the recording signal 1506 and falls Tw before the fall of the recording signal 1506. The last pulse 1511 is a signal which rises Tw before the fall of the recording signal 1506 and falls at the fall of the recording signal 1506. When the H level period of the recording signal 1506 is 2 Tw, no intermediate pulse is generated.

The first pulse 1509 is delayed by a fixed delay unit 1512 having a delay amount K to become a signal 1513.

The intermediate pulse 1510 is input to a multi-pulse generation circuit 1514, becomes an intermediate multi-pulse 1517, is delayed by a fixed delay unit 1518 having a delay amount K, and
519.

The last pulse 1511 becomes the last multi-pulse 1523 in the multi-pulse generation circuit 1520.
The signal 1525 is selected by the selector 1524, and is delayed by the variable delay unit 1529 according to the memory output 1528 to become the signal 1530.

Signal 1519, signal 1513 and signal 153
The output 1532 from the OR circuit 1531 of 0 is the selector 1
Selected at 535, input to the laser drive circuit 1537,
The light source is driven to have an optical drive waveform 1538, and recording marks 1601 and 1602 are formed.

Next, the case where the switch 1541 is ON will be described with reference to FIG.

The gate generation circuit 1539 obtains the measurement result 15
H level is output only when 07 is 2. Therefore, when the select signal 1542 is 2 when the measurement result 1507 is 2,
It becomes H level, and the selectors 1524 and 1535 select and output the Y input. Therefore, the last pulse 1511
Is input to the variable delay unit 1529 and is delayed, and the signal 153
0, and the signal 1513 and the signal 1530
An output 1534 from the D circuit 1533 is guided to the laser drive circuit 1537. Therefore, when the mark to be recorded is 2 Tw, a pulse width equal to or smaller than Tw can be created, and smaller marks can be handled.

When the measurement result 1507 is other than 2, it is the same as when the switch 1541 is OFF.

As described above, in the eighth embodiment, when forming the recording mark 1601 or 1602, the driving is performed by a plurality of pulses, and the driving of the last pulse is terminated early according to the length of the recording mark to be recorded. Therefore, it is possible to correct a difference in heat accumulation at the end of the mark due to the length of the recording mark, and to form the end of the recording mark at a correct position. Further, by driving in a plurality of pulses, the heat load applied to the medium can be reduced, and there is also an effect of reducing deterioration due to repeated recording.

By changing the method of dividing the leading pulse, intermediate pulse and last pulse by the pulse dividing circuit, it is possible to cope with various pulse patterns.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 9) Optical drive waveform 1820 in FIG.
Is an optical drive waveform according to the ninth embodiment of the present invention.

The optical drive waveform 1820 corresponds to the recording signal 1806.
Is delayed by a fixed amount K, the drive end time is earlier than the reference signal 1816.

The amount of change corresponds to the combination of the length of the recording mark to be recorded and the length of the non-recording portion to be recorded immediately after (1, 7) modulation, as shown in Table 9. Can be determined.

[0264]

[Table 9]

For example, the length of the recording mark 1901 to be recorded is T1901 = 5Tw (Tw is the detection window width), and the length of the non-recording portion immediately after is T1902 = 6Tw. Only (5, 6) ends quickly, and the recording length of the recording mark 1902 is T1
903 = 8 Tw, and the length of the non-recorded portion immediately after is T1
Since 904 = 2Tw, the processing ends earlier by d9 (8, 2).

If the length of the non-recorded portion immediately after is the same,
The longer the length of the mark to be recorded, the greater the effect of heat accumulation at the end of the mark, and the greater the extension of the end. Therefore, d9 (8, N)> d9 (7, N) >> ... d9
(2, N).

If the length of the recording mark is the same, as the length of the immediately following non-recording portion is smaller, the temperature of the end portion of the mark is less likely to decrease, and the extension of the end is increased. Therefore, d9 (N, 2)> d9 (N, 3) >> ... d9
(N, 8).

As a result, it is possible to correct the difference in heat accumulation at the end of the mark due to the length of the recording mark and the difference in the thermal history at the end of the mark due to the length of the immediately following unrecorded portion. Formed in the correct position.

Although the optical driving waveform 1820 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 18 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 9 of the present invention.

In FIG. 18, 1801 is a clock generation circuit, 1802 is a clock signal, 1803 is a recording signal generation circuit, 1804 is a recording signal output from the recording signal generation circuit 1803, 1805 is an H level period length measuring circuit,
Reference numeral 806 denotes a recording signal after passing through the H level period length measurement circuit 1805, 1807 denotes an H level period measurement result output, and 180
8 is an L level period length measurement circuit, 1809 is the output of the measurement result, 1810 is a delay circuit, 1811 is a memory, 181
2 is a memory output, 1813 is a variable delay, 1814 is a variable delay output, 1815 is a fixed delay, 1816 is its output, 1817 is an AND circuit, 1818 is its output,
819 is a laser drive circuit, and 1820 is an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 1801 outputs a channel clock 1802 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 1804 output from the recording signal generation circuit 1803 in synchronization with the rise of the channel clock signal 1802 from the clock generation circuit 1801
Is input to the H-level period length measurement circuit 1805. H
The level period length measuring circuit 1805 detects the H level of the recording signal 1804.
The length of the level period is measured, and the recording signal 180 is renewed.
6 and the measurement result 1807 are output. Measurement result 1807
Is output in synchronization with the rising of the measured H level of the recording signal 1806. That is, if the length of the H level period is expressed by the number of channel clocks, H
The length of the level period T1901 is 5, and the measurement result 18
07 is 5 at the rise of the H-level period T1901, the length of the H-level period T1903 is 8, and the measurement result 1807 is 8 at the rise of the H-level period T1903.

The recording signal 1804 is input to the L level period length measuring circuit 1808. The L level period length measuring circuit 1808 measures the length of the L level period of the recording signal 1804, and outputs a measurement result 1809. Measurement result 18
09 is output in synchronization with the rise of the H level immediately before the measured L level. That is, if the length of the L-level period is represented by the number of channel clocks, the length of the L-level period T1902 is 6, and the measurement result 1809 becomes 6 at the rising edge of the immediately preceding H-level period T1901, The length of the L level period T1904 is 8, and the measurement result 1809 indicates the immediately preceding H level period T19.
It becomes 8 at the rise of 03.

The measurement results 1807 and 1809 are
Input to the delay circuit 1810.

In delay circuit 1810, measurement result 180
7 and 1809 are input to the memory 1811 and
11 outputs a memory output 1812. Here, as shown in Table 9, the memory 1811 stores the combination of the length of the current recording mark (corresponding to the measurement result 1807) and the length of the immediately non-recorded portion (corresponding to the measurement result 1809). The corresponding value is stored, and the corresponding stored value is output.

The variable delay unit 1813 has a memory output 1812
, The recording signal 1806 is delayed and a signal 1814 is output.

On the other hand, the recording signal 1806 passes through a fixed delay unit 1815 having a delay amount K, and a signal 181 delayed by K
It becomes 6.

[0280] The signals 1814 and 1816 are input to an AND circuit 1817 and output as a signal 1818.

The output signal 1818 is input to the laser drive circuit 1819, which drives the light source and generates the light drive waveform 1
820, and recording marks 1901 and 1902 are formed.

As described above, in the ninth embodiment, when forming the recording marks 1901 and 1902, the recording of the light source is performed in accordance with the combination of the length of the recording mark to be recorded and the length of the non-recording portion immediately after. Since the drive with power is terminated early, the difference in heat accumulation at the end of the mark due to the length of the recording mark can be corrected, and the difference in the heat history at the end of the mark due to the length of the immediately unrecorded portion. Can be corrected, so that the end portion of the recording mark can be formed at a correct position.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 10) Optical drive waveform 203 shown in FIG.
8 is an optical drive waveform in Example 10 of the present invention.

[0285] The light drive waveform 2038 is composed of a plurality of pulses. Further, with respect to the optical drive waveform 2038, the drive end time of the last pulse is earlier with respect to the signal 2100 obtained by delaying the recording signal 2006 by a fixed amount K.

The amount of change corresponds to the combination of the length of the recording mark to be recorded and the length of the immediately following non-recording portion, as shown in Table 10, in the case of (1, 7) modulation. It is decided.

[0287]

[Table 10]

For example, the length of the recording mark 2101 to be recorded is T2101 = 2 Tw (Tw is the width of the detection window), and the length of the immediately non-recording portion is T2102 = 4.
Since it is Tw, only d10 (2, 4) ends quickly,
The length of the recording mark 2102 to be recorded is T2103 = 8
Tw, and the length of the non-recording portion immediately after should be T21.
Since 04 = 3Tw, the processing ends earlier by d10 (8,3).

If the length of the unrecorded portion immediately after is the same, the longer the length of the mark to be recorded, the greater the effect of heat accumulation at the end of the mark and the greater the extension of the end. Therefore, d10 (8, N)> d10 (7, N)>.
> D10 (2, N) (N is an integer of 2 to 8).

If the mark length to be recorded is the same,
The shorter the length of the immediately following non-recording portion, the more difficult it is for the temperature at the mark end portion to decrease, and the larger the end extension.
Therefore, d10 (N, 2)> d10 (N, 3)>
..> D10 (N, 8) (N is an integer of 2 to 8).

As a result, it is possible to correct the difference in the heat accumulation at the end of the mark due to the length of the recording mark, and also to correct the difference in the thermal history at the end of the mark due to the length of the non-recording portion immediately after. Is formed in the correct position.

Although the optical drive waveform 2038 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 20 is a block diagram of a recording system of an optical disc device capable of obtaining an optical drive waveform according to Embodiment 10 of the present invention.

In FIG. 20, 2001 is a clock generation circuit, 2002 is a clock signal, 2003 is a recording signal generation circuit, 2004 is a recording signal output from the recording signal generation circuit 2003, 2005 is an H level period length measurement circuit,
006 is a recording signal after passing through the H-level period length measurement circuit 2005, 2007 is an H-level period measurement result output, 200
8 is a pulse dividing circuit, 2009 is a leading pulse, 2010
Is an intermediate pulse, 2011 is a last pulse, 2012 is a fixed delay device, 2013 is its output, 2014 is a multi-pulse generation circuit, 2015 is an inversion circuit, 2016 is an AND circuit, 2017 is an intermediate multi-pulse, 2018 is a fixed delay device, and 2019 is a fixed delay device. Is its output, 2020 is a multi-pulse generation circuit, 2021 is an inversion circuit, 2022 is an AND circuit,
023 is a last multi circuit, 2024 is a selector, 20
25 is its output, 2026 is a delay circuit, 2027 is a memory, 2028 is a memory output, 2029 is a variable delay device,
030 is its output, 2031 is its OR circuit, 2032 is its output, 2033 is its AND circuit, 2034 is its output,
2035 is a selector, 2036 is its output, 2037 is a laser drive circuit, 2038 is an optical drive waveform, 2039 is a gate generation circuit, 2040 is its output, 2041 is a switch, and 2042 is a select signal. Here, the selectors 2024 and 2035 select and output the X input when the select signal 2042 is at the L level, and select and output the Y input when the select signal 2042 is at the H level. Reference numeral 2043 denotes an L-level period length measurement circuit, and reference numeral 2044 denotes a measurement result output.

First, the operation when switch 2041 is OFF, that is, when select signal 2042 is at L level, will be described with reference to the timing chart of FIG.

Clock generation circuit 2001 outputs a channel clock 2002 having a period of detection window width Tw. du
ty is variable.

The recording signal 2004 output from the recording signal generation circuit 2003 in synchronization with the rise of the channel clock signal 2002 from the clock generation circuit 2001.
Is input to the H-level period length measurement circuit 2005 and the L-level period length measurement circuit 2043.

The H level period length measuring circuit 2005 measures the length of the H level period of the recording signal 2004, and outputs the recording signal 2006 and the measurement result 2007 again. The measurement result 2007 is output in synchronization with the rise of the measured H level of the recording signal 2006. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T2101 is 2, and the measurement result 2007 becomes 2 at the rise of the H-level period T2101. The length of T2103 is 8, and the measurement result 2007 indicates the H level period T2.
It becomes 8 at the rise of 103.

The L-level period length measuring circuit 2043 measures the length of the L-level period of the recording signal 2004, and the measurement result 2
044 is output. The measurement result 2044 is the recording signal 20
06 is output in synchronization with the rise of the H level immediately before the measured L level. That is, if the length of the L level period is expressed by the number of channel clocks, L
The length of the level period T2102 is 4, and the measurement result 20
44 is 4 at the rise of the immediately preceding H level period T2101, the length of the L level period T2104 is 3, and the measurement result 2044 is 3 at the rise of the immediately preceding H level period T2103.

Then, the measurement results 2007 and 2044 are
Input to the delay circuit 2026. In the delay circuit 2026,
The measurement results 2007 and 2044 are input to the memory 2027, and the memory 2027 outputs a memory output 2028. Here, as shown in Table 10, the memory 2027 stores the length of the current recording mark (corresponding to the measurement result 2007) and the length of the immediately non-recorded portion (corresponding to the measurement result 20).
44 (corresponding to 44), and the corresponding stored value is output.

On the other hand, the recording signal 2006 is divided by a pulse dividing circuit 2008 into a leading pulse 2009 and an intermediate pulse 201.
It is divided into 0 and the last pulse 2011. In this example, the leading pulse 2009 is a signal that rises at the rise of the recording signal 2006 and falls after Tw, and the intermediate pulse 2010 rises Tw after the rise of the recording signal 2006 and falls before Tw, the fall of the recording signal 2006. The last pulse 2011 is a signal which rises before Tw of the fall of the recording signal 2006 and falls at the fall of the recording signal 2006. When the H level period of the recording signal 2006 is 2 Tw, no intermediate pulse is generated.

[0302] The leading pulse 2009 is delayed by the fixed delay unit 2012 of the delay amount K to become a signal 2013.

The intermediate pulse 2010 is input to the multi-pulse generation circuit 2014, becomes an intermediate multi-pulse 2017, is delayed by the fixed delay unit 2018 having the delay amount K, and
019.

The last pulse 2011 becomes the last multi-pulse 2023 in the multi-pulse generation circuit 2020.
The signal is selected by the selector 2024 and becomes a signal 2025, and is delayed by the variable delay unit 2029 according to the memory output 2028 to become a signal 2030.

Signal 2019, signal 2013 and signal 203
The output 2032 from the OR circuit 2031 of 0 is the selector 2
035, input to the laser drive circuit 2037,
The light source is driven to have an optical drive waveform 2038, and recording marks 2101 and 2102 are formed.

Next, the case where the switch 2041 is ON will be described with reference to FIG.

The gate generation circuit 2039 calculates the measurement result 20
H level is output only when 07 is 2. Therefore, when the select signal 2042 indicates that the measurement result 2007 is 2,
It becomes H level, and the selectors 2024 and 2035 select and output the Y input. Therefore, the last pulse 2011
Is input to the variable delay unit 2029 and is delayed, and the signal 203
0, and the signal 2013 and the signal 2030
An output 2034 from the D circuit 2033 is guided to the laser drive circuit 2037. Therefore, when the mark to be recorded is 2 Tw, a pulse width equal to or smaller than Tw can be created, and smaller marks can be handled.

When the measurement result 2007 is other than 2, the operation is the same as when the switch 2041 is OFF.

Thus, in the tenth embodiment, when forming the recording mark 2101 or 2102,
Driving with a plurality of pulses, the drive of the last pulse is terminated early according to the combination of the length of the recording mark to be recorded and the length of the non-recording part immediately after. It is possible to correct the difference in heat accumulation at the end part and also to correct the difference in heat history at the mark end part due to the length of the non-recording part immediately after, so that the end part of the recording mark is formed at the correct position. Can be. Further, by driving in a plurality of pulses, the heat load applied to the medium can be reduced, and there is also an effect of reducing deterioration due to repeated recording.

By changing the method of dividing the leading pulse, intermediate pulse, and last pulse by the pulse dividing circuit, various pulse patterns can be handled.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 11) Optical drive waveform 232 in FIG.
Reference numeral 1 denotes an optical drive waveform according to the eleventh embodiment of the present invention.
In the optical drive waveform 2321, the drive start time at the recording power is delayed and the drive end time is earlier than the reference signal 2400 obtained by delaying the recording signal 2306 by a fixed amount K.

The amount of delay in the drive start time and the amount of change in the drive end time (how fast the process ends) are (1, 7)
Taking modulation as an example, as shown in Table 11, it is determined according to the length of a recording mark to be recorded.

[0314]

[Table 11]

For example, since the length of the recording mark 2401 to be recorded is T2401 = 2 Tw (Tw is the width of the detection window), the driving start time of the recording power of the optical driving waveform 2321 is delayed by B11 (2), and the operation ends. The time ends quickly only for E11 (2). Since the length of the recording mark 2402 to be recorded is T2402 = 8Tw, the optical drive waveform 232
The drive start time of the recording power of 1 is delayed by B11 (8), and the end time ends quickly only by E11 (8).

The shorter the length of the mark to be recorded, the easier it is to obtain the quenching condition after the temperature rise at the mark start end portion. Therefore, when a phase change medium is used, the mark start end elongation increases. Therefore, B11 (2)> B11 (3) >> ... B1
It tends to be 1 (8).

As the length of a mark to be recorded is longer, the influence of heat accumulation at the end of the mark is greater, and the extension of the end is greater. Therefore, E11 (8)> E11 (7)>...
> E11 (2).

As a result, it is possible to correct a difference in heat history at the mark start end portion due to the recording mark length and a difference in heat accumulation at the mark end portion due to the recording mark length.
The start and end portions of 1, 2402 are formed at the correct positions.

Although the optical driving waveform 2321 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 23 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 11 of the present invention.

In FIG. 23, reference numeral 2301 denotes a clock generation circuit; 2302, a clock signal; 2303, a recording signal generation circuit; 2304, a recording signal output from the recording signal generation circuit 2303;
306 is a recording signal after passing through the H level period length measuring circuit 2305, 2307 is an H level period measurement result output, 230
8 is a first delay circuit, 2309 is a first memory, 2310 is a first memory output, 2311 is a first variable delay, 2312
Is its output, 2313 is the second delay circuit, and 2314 is the second delay circuit.
Memory, 2315 is a second memory output, 2316 is a second variable delay, 2317 is its output, 2318 is an AND circuit, 2319 is its output, 2320 is a laser drive circuit,
Reference numeral 2321 denotes an optical drive waveform.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 2301 outputs a channel clock 2302 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 2304 output from the recording signal generation circuit 2303 is synchronized with the rise of the channel clock signal 2302 from the clock generation circuit 2301.
Is input to the H-level period length measurement circuit 2305. H
The level period length measuring circuit 2305 detects the H level of the recording signal 2304.
The length of the level period is measured, and the recording signal 230 is renewed.
6 and the measurement result 2307 are output. Measurement result 2307
Is output in synchronization with the rising of the measured H level of the recording signal 2306. That is, if the length of the H level period is expressed by the number of channel clocks, H
The length of the level period T2401 is 2, and the measurement result 23
07 is 2 at the rise of the H-level period T2401, the length of the H-level period T2402 is 8, and the measurement result 2307 is 8 at the rise of the H-level period T2402.

Then, the measurement result 2307 is input to the first delay circuit 2308 and the second delay circuit 2313.

In the first delay circuit 2308, the measurement result 23
07 is input to the first memory 2309 and the first memory 23
From 09, a first memory output 2310 is output. Here, as shown in Table 11, a value corresponding to the length of the current recording mark (corresponding to the measurement result 2307) is stored in the memory 2309, and the corresponding stored value is output.
The first variable delay unit 2311 delays the recording signal 2306 and outputs a signal 2312 according to the first memory output 2310.

In the second delay circuit 2313, the measurement result 2307 is input to the second memory 2314, and the second memory 2314 outputs the second memory output 2315.
Here, as shown in Table 11, the second memory 2314 stores a value corresponding to the length of the current recording mark (corresponding to the measurement result 2307), and the corresponding stored value is output. . The second variable delay 2316 delays the recording signal 2306 in accordance with the second memory output
317 is output.

[0328] The signal 2312 and the signal 2317 are input to an AND circuit 2318 and output as a signal 2319.

The output signal 2319 is input to the laser drive circuit 2320, which drives the light source and outputs the light drive waveform 2
321, and recording marks 2401 and 2402 are formed.

As described above, in the eleventh embodiment, when forming the recording marks 2401 and 2402, the drive start time at the recording power is delayed according to the length of the recording marks to be recorded. Since the difference in the thermal history at the start of the mark due to the length is corrected, and the drive end time at the recording power is ended earlier, the difference in the heat accumulation at the end of the mark due to the length of the recording mark is corrected. The start and end portions of the mark can be formed at correct positions.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 12) Optical drive waveform 254 shown in FIG.
Reference numeral 1 denotes an optical drive waveform according to the twelfth embodiment of the present invention.

[0333] The optical drive waveform 2541 is composed of a plurality of pulses. Furthermore, the optical drive waveform 2541 has a drive start time of the first pulse delayed and a drive end time of the last pulse advanced with respect to the signal 2600 obtained by delaying the recording signal 2506 by a fixed amount K. .

The delay amount is determined according to the length of a recording mark to be recorded as shown in Table 12 in the case of (1, 7) modulation.

[0335]

[Table 12]

For example, since the length of the recording mark 2601 to be recorded is T2601 = 2 Tw (Tw is the detection window width), the recording start time is delayed by B12 (2), and the end time is only E12 (2). finish. Record mark 26
Since the recording length of 02 is T2602 = 8Tw, the recording start time is delayed by B12 (8), and the end time is ended only by E12 (8).

The shorter the length of the mark to be recorded, the easier the quenching condition is at the start of the mark. In the case of a phase change medium in which a mark is formed by rapid cooling after temperature rise, the extension of the start of the mark is large. Therefore, B12 (2)> B12
(3) >> B12 (8).

The longer the mark length to be recorded, the greater the effect of heat accumulation at the end of the mark, and the greater the extension of the end. Therefore, E12 (8)> E12 (7)> ...
> E12 (2).

As a result, it is possible to correct the difference in the heat history at the mark start end portion due to the recording mark length, and also to correct the difference in the heat accumulation at the mark end portion due to the record mark length, so that the start end portions of the recording marks 2601 and 2602 can be corrected. , The end portion is formed in the correct position.

Although the optical driving waveform 2541 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power, or between the recording power and 0. It only has to be driven.

FIG. 25 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 12 of the present invention.

In FIG. 25, reference numeral 2501 denotes a clock generation circuit; 2502, a clock signal; 2503, a recording signal generation circuit; 2504, a recording signal output from the recording signal generation circuit 2503;
506 is a recording signal after passing through the H level period length measuring circuit 2505, 2507 is an H level period measurement result output, and 250
8 is a pulse dividing circuit, 2509 is a leading pulse, 2510
Is an intermediate pulse, 2511 is a last pulse, 2512 is a first delay circuit, 2513 is a first memory, 2514 is a first memory output, 2515 is a first variable delay, 2516 is its output, 2517 is a second delay circuit, 2518 Is a second memory, 2519 is a second memory output, 2520 is a second variable delay, 2521 is its output, 2522 is a multi-pulse generation circuit, 2523 is an inversion circuit, 2524 is an AND circuit,
2525 is an intermediate multi-pulse, 2526 is a fixed delay unit,
2527 is its output, 2528 is a multi-pulse generation circuit, 2529 is an inversion circuit, 2530 is an AND circuit,
31 is the last multipulse, 2532 is a selector, 25
33 is its output, 2534 is an OR circuit, 2535 is its output, 2536 is an AND circuit, 2537 is its output,
538 is a selector, 2539 is its output, 2540 is a laser drive circuit, 2541 is an optical drive waveform, 2542 is a gate generation circuit, 2543 is its output, 2544 is a switch, and 2545 is a select signal. Here, the selectors 2532 and 2538 select and output the X input when the select signal 2545 is at the L level, and select and output the Y input when the select signal 2545 is at the H level.

First, the operation when switch 2544 is OFF, that is, when select signal 2545 is at L level, will be described with reference to the timing chart of FIG.

The clock generation circuit 2501 outputs a channel clock 2502 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 2504 output from the recording signal generation circuit 2503 in synchronization with the rise of the channel clock signal 2502 from the clock generation circuit 2501
Is input to the H-level period length measurement circuit 2505.

The H level period length measuring circuit 2505 measures the length of the H level period of the recording signal 2504, and outputs the recording signal 2506 and the measurement result 2507 again. The measurement result 2507 is output in synchronization with the rising of the measured H level of the recording signal 2506. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T2601 is 2, the measurement result 2507 becomes 2 at the rise of the H-level period T2601, and The length of T2602 is 8, and the measurement result 2507 indicates the H level period T2.
It becomes 8 at the rise of 602.

Then, the measurement result 2507 is input to the first delay circuit 2512 and the second delay circuit 2517.

In the first delay circuit 2512, the measurement result 25
07 is input to the first memory 2513,
13 outputs a first memory output 2514. Here, as shown in Table 12, the first memory 2513 stores a value corresponding to the length of the current recording mark (corresponding to the measurement result 2507), and the corresponding stored value is output. .

In the second delay circuit 2517, the measurement result 25
07 is input to the second memory 2518 and the second memory 2518
18 outputs a second memory output 2519. Here, as shown in Table 12, the second memory 2518 stores a value corresponding to the length of the current recording mark (corresponding to the measurement result 2507), and the corresponding stored value is output. .

On the other hand, the recording signal 2506 is divided by a pulse dividing circuit 2508 into a leading pulse 2509 and an intermediate pulse 251.
It is divided into 0 and the last pulse 2511. In this example, the first pulse 2509 rises at the rise of the recording signal 2506 and falls after Tw, and the intermediate pulse 2510 rises Tw after the rise of the recording signal 2506 and falls before Tw before the fall of the recording signal 2506. The last pulse 2511 is a signal which rises Tw before the fall of the recording signal 2506 and falls at the fall of the recording signal 2506. When the H level period of the recording signal 2506 is 2 Tw, no intermediate pulse is generated.

The first pulse 2509 is supplied to the first variable delay 2
At 515, the first memory output 2514 is delayed and the signal 2
516.

The intermediate pulse 2510 is input to the multi-pulse generation circuit 2522, becomes an intermediate multi-pulse 2525, is delayed by a fixed delay unit 2526 having a delay amount K, and
527.

The last pulse 2511 becomes the last multi-pulse 2531 in the multi-pulse generation circuit 2528.
The signal 2533 is selected by the selector 2532, and is delayed by the second variable delay 2520 according to the second memory output 2519 to become the signal 2521.

Signals 2516, 2527 and 252
1 2OR output from the OR circuit 2534 is the selector 2
Selected at 538 and input to the laser drive circuit 2540,
The light source is driven to have an optical drive waveform 2541, and recording marks 2601 and 2602 are formed.

Next, the case where the switch 2544 is ON will be described with reference to FIG.

The gate generation circuit 2542 calculates the measurement result 25
H level is output only when 07 is 2. Therefore, when the select signal 2545 indicates that the measurement result 2507 is 2,
It becomes H level, and the selectors 2532 and 2538 select and output the Y input. Therefore, the last pulse 2511
Is input to the second variable delay device 2520, is delayed, and the signal 2
521, and the output 2537 of the signal 2521 and the signal 2516 by the AND circuit 2536 is guided to the laser drive circuit 2540. Therefore, when the mark to be recorded is 2 Tw, a pulse width smaller than Tw can be created,
Can handle even smaller marks.

When the measurement result 2507 is other than 2, it is the same as when the switch 2544 is OFF.

As described above, in the twelfth embodiment, when forming the recording mark 2601 or 2602,
It is driven by a plurality of pulses, and according to the length of the recording mark to be recorded, the driving start time of the first pulse is delayed to correct the difference in the thermal history of the mark start part due to the recording mark length. Can be formed at the correct position, and according to the length of the recording mark to be recorded, the drive of the last pulse is terminated early to correct the difference in heat accumulation at the end of the mark due to the length of the recording mark. The end portion of the recording mark can also be formed at a correct position. Further, by driving in a plurality of pulses, the heat load applied to the medium can be reduced, and there is also an effect of reducing deterioration due to repeated recording.

By changing the method of dividing the leading pulse, the intermediate pulse, and the last pulse by the pulse dividing circuit, it is possible to cope with various pulse patterns.

In this case, the optical drive waveform is driven between the recording power and the erasing power. However, if it is driven according to the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 13) Optical drive waveform 282 in FIG. 29
Reference numeral 1 denotes an optical drive waveform according to the thirteenth embodiment of the present invention.
In the optical drive waveform 2821, the drive start time at the recording power is delayed and the drive end time is earlier than the reference signal 2900 obtained by delaying the recording signal 2806 by a fixed amount K.

The delay amount of the drive start time is determined according to the length of a recording mark to be recorded, as shown in Table 13 (a), in the case of (1, 7) modulation as an example.

[0363]

[Table 13]

For example, since the length of the recording mark 2901 to be recorded is T2901 = 2 Tw (Tw is the detection window width), the driving start time of the recording power of the optical driving waveform 2821 is delayed by B13 (2), and the recording is started. Since the length of the mark 2902 to be recorded is T2903 = 8Tw, the drive start time of the recording power of the optical drive waveform 2821 is B13 (8).
Just delay.

In the case of the (1, 7) modulation as an example, the delay amount of the drive end time is, as shown in Table 13 (b), the length of the recording mark to be recorded and the length of the non-recording portion immediately after it. It is determined according to the combination with

For example, the length of the recording mark 2901 to be recorded is T2901 = 2 Tw (Tw is the width of the detection window), and the length of the immediately non-recorded portion is T2902 = 4.
Tw, the drive end time of the recording power of the optical drive waveform 2821 ends earlier by E13 (2, 4), the length of the recording mark 2902 to be recorded is T2903 = 8Tw, and The expected length is T2904 =
Since it is 3 Tw, the drive end time of the recording power of the optical drive waveform 2821 ends earlier by E13 (8, 3).

The shorter the length of the mark to be recorded, the easier it is to obtain the quenching condition after the temperature rise at the mark start end portion. Therefore, when the phase change medium is used, the mark start end elongation increases. Therefore, B13 (2)> B13 (3) >> ... B1
It tends to be 3 (8).

If the length of the non-recorded portion immediately after is the same,
The longer the length of the mark to be recorded, the greater the effect of heat accumulation at the end of the mark, and the greater the extension of the end. Therefore, E13 (8, N)> E13 (7, N) >> ... E
13 (2, N). (N is an integer from 2 to 8) If the length of the mark to be recorded is the same, the shorter the length of the immediately unrecorded portion, the more difficult it is for the temperature of the mark end portion to decrease, and the larger the end extension. Therefore, E13 (N,
2)> E13 (N, 3) >>...> E13 (N, 8). (N is an integer from 2 to 8) As a result, the difference in the thermal history at the mark start end portion due to the recording mark length can be corrected, and the mark start end portion is formed at a correct position. Also, the difference in heat accumulation at the end of the mark due to the length of the recording mark can be corrected, and the difference in the heat history at the end of the mark due to the length of the immediately following unrecorded portion can be corrected.
The mark end portion is formed at a correct position.

Although the optical driving waveform 2821 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 28 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 13 of the present invention.

In FIG. 28, reference numeral 2801 denotes a clock generation circuit, 2802 denotes a clock signal, 2803 denotes a recording signal generation circuit, 2804 denotes a recording signal output from the recording signal generation circuit 2803, 2805 denotes an H level period length measurement circuit,
806 is a recording signal after passing through the H level period length measuring circuit 2805, 2807 is an H level period measurement result output, 280
8 is a first delay circuit, 2809 is a first memory, 2810 is a first memory output, 2811 is a first variable delay, 2812
Is its output, 2813 is the second delay circuit, 2814 is the second delay circuit
A memory, 2815 is a second memory output, 2816 is a second variable delay, 2817 is its output, 2818 is an AND circuit, 2819 is its output, 2820 is a laser drive circuit,
Reference numeral 2821 denotes an optical drive waveform, 2822 denotes an L-level period length measurement circuit, and 2823 denotes a measurement result output.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 2801 outputs a channel clock 2802 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 2804 output from the recording signal generation circuit 2803 in synchronization with the rise of the channel clock signal 2802 from the clock generation circuit 2801.
Is input to the H-level period length measurement circuit 2805 and the L-level period length measurement circuit 2822.

The H level period length measuring circuit 2805 measures the length of the H level period of the recording signal 2804, and outputs the recording signal 2806 and the measurement result 2807 again. The measurement result 2807 is output in synchronization with the rise of the measured H level of the recording signal 2806. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T2901 is 2, and the measurement result 2807 becomes 2 at the rise of the H-level period T2901, and The length of T2903 is 8, and the measurement result 2807 indicates the H level period T2.
It becomes 8 at the rise of 903.

The measurement result 2807 is input to the first delay circuit 2808 and the second delay circuit 2813.

The L level period length measuring circuit 2822 measures the length of the L level period of the recording signal 2804, and the measurement result 2
823 is output. The measurement result 2823 is the recording signal 28
06 is output in synchronization with the rise of the H level immediately before the measured L level. That is, if the length of the L level period is expressed by the number of channel clocks, L
The length of the level period T2902 is 4, and the measurement result 28
23 is an H level period T290 immediately before the L level period.
At the rise of 1, it becomes 4 and the length of the L level period T2904 is 3, and the measurement result 2823 becomes 3 at the rise of the immediately preceding H level period T2903.

The measurement result 2823 is input to the second delay circuit 2813.

In the first delay circuit 2808, the measurement result 28
07 is input to the first memory 2809 and the first memory 28
09 outputs a first memory output 2810. Here, as shown in Table 13 (a), a value corresponding to the length of the current recording mark (corresponding to the measurement result 2807) is stored in the memory 2809, and the corresponding stored value is output. You. The first variable delay 2811 has a first memory output 281
0, the recording signal 2806 is delayed and the signal 2812 is delayed.
Is output.

In the second delay circuit 2813, the measurement results 2807 and 2823 are input to the second memory 2814, and the second memory 2814 outputs the second memory output 2815. Here, the second memory 2814 has
As shown in (b), the value corresponding to the combination of the desired length of the current recording mark (corresponding to the measurement result 2807) and the desired length of the immediately non-recorded portion (corresponding to the measurement result 2823) Stored, and the corresponding stored value is output. The second variable delay 2816 has a second memory output 2815
, The recording signal 2806 is delayed and a signal 2817 is output.

[0381] The signal 2812 and the signal 2817 are input to an AND circuit 2818, and output as a signal 2819.

The output signal 2819 is input to the laser drive circuit 2820 to drive the light source and generate the light drive waveform 2
821, and recording marks 2901 and 2902 are formed.

As described above, in the thirteenth embodiment, when forming the recording marks 2901 and 2902, the drive start time at the recording power is delayed according to the length of the recording marks to be recorded. Since the difference in the thermal history of the mark start end portion due to the length is corrected, the start end of the recording mark can be formed at a correct position. In addition, according to the combination of the length of the recording mark to be recorded and the length of the non-recording portion immediately after the recording mark, the drive end time at the recording power is ended earlier, and the heat at the end of the mark due to the length of the recording mark is reduced. Since the difference in the accumulation is corrected and the difference in the thermal history at the end of the mark due to the length of the non-recorded portion immediately after is corrected, the end of the recorded mark can be formed at the correct position.

In this case, the optical driving waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 14) Optical drive waveform 304 shown in FIG.
Reference numeral 1 denotes an optical drive waveform in Example 14 of the present invention.

[0386] The light drive waveform 3041 is composed of a plurality of pulses. Further, with respect to the optical drive waveform 3041, the drive start time of the first pulse is delayed and the drive end time of the last pulse is earlier with respect to the signal 3100 obtained by delaying the recording signal 3006 by a fixed amount K. .

The drive start delay amount of the first pulse is (1,
7) Taking modulation as an example, as shown in Table 14 (a), it is determined according to the length of a recording mark to be recorded.

[0388]

[Table 14]

For example, since the recording length of the recording mark 3101 is T3101 = 2 Tw (Tw is the detection window width), the recording start time is delayed by B14 (2), and the recording length of the recording mark 3102 is Is T3103 = 8Tw, the recording start time is delayed by B14 (8).

The driving end delay amount of the last pulse is (1,
7) Taking modulation as an example, as shown in Table 14 (b), it is determined according to the combination of the length of a recording mark to be recorded and the length of a non-recording portion immediately after it.

For example, the length of the recording mark 3101 to be recorded is T3101 = 2 Tw (Tw is the detection window width), and the length of the non-recording portion immediately after is T3102 = 4.
Since it is Tw, the end time is advanced by E14 (2, 4), and the recording length of the recording mark 3102 is T310.
3 = 8Tw, and the desired length of the non-recording portion immediately after is T3104 = 3Tw, so the end time is E14
Go faster by (8, 3)

The shorter the length of the mark to be recorded, the easier it is to obtain the rapid cooling condition at the beginning of the mark. In the case of a phase change medium in which the mark is formed by rapid cooling after temperature rise, the extension of the beginning of the mark is large. Therefore, B14 (2)> B14
(3) >> B14 (8).

If the length of the non-recorded portion immediately after is the same,
The longer the length of the mark to be recorded, the greater the effect of heat accumulation at the end of the mark, and the greater the extension of the end. Therefore, E14 (8, N)> E14 (7, N) >> ... E
14 (2, N) (N is an integer from 2 to 8).

If the length of the mark to be recorded is the same, the shorter the length of the immediately unrecorded portion, the more difficult it is for the temperature at the end portion of the mark to decrease, and the greater the extension of the end portion. Therefore,
E14 (N, 2)> E14 (N, 3) >> ... E14
(N, 8) (N is an integer from 2 to 8).

As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the recording mark length, and to correct the difference in the heat accumulation at the mark end portion due to the recording mark length. Since the thermal history at the mark end portion can also be corrected, the start and end portions of the recording marks 3101 and 3102 are formed at correct positions.

Although the optical driving waveform 3041 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 30 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 14 of the present invention.

In FIG. 30, reference numeral 3001 denotes a clock generation circuit; 3002, a clock signal; 3003, a recording signal generation circuit; 3004, a recording signal output from the recording signal generation circuit 3003;
006 is a recording signal after passing through the H level period length measuring circuit 3005, 3007 is an H level period measurement result output, 300
8 is a pulse dividing circuit, 3009 is a leading pulse, 3010
Is an intermediate pulse, 3011 is a last pulse, 3012 is a first delay circuit, 3013 is a first memory, 3014 is a first memory output, 3015 is a first variable delay device, 3016 is its output, 3017 is a second delay circuit, 3018 Is a second memory, 3019 is a second memory output, 3020 is a second variable delay, 3021 is its output, 3022 is a multi-pulse generation circuit, 3023 is an inversion circuit, 3024 is an AND circuit,
3025 is an intermediate multipulse, 3026 is a fixed delay,
3027 is its output, 3028 is a multi-pulse generation circuit, 3029 is an inversion circuit, 3030 is an AND circuit,
31 is the last multipulse, 3032 is the selector, 30
33 is its output, 3034 is its OR circuit, 3035 is its output, 3036 is its AND circuit, 3037 is its output,
038 is a selector, 3039 is its output, 3040 is a laser drive circuit, 3041 is an optical drive waveform, 3042 is a gate generation circuit, 3043 is its output, 3044 is a switch, and 3045 is a select signal. Here, the selectors 3032 and 3038 select and output the X input when the select signal 3045 is at the L level, and select and output the Y input when the select signal 3045 is at the H level. Further, reference numeral 3046 denotes an L-level period length detection circuit, and reference numeral 3047 denotes an output of the measurement result.

First, the operation when switch 3044 is OFF, that is, when select signal 3045 is at L level, will be described with reference to the timing chart of FIG.

The clock generation circuit 3001 outputs a channel clock 3002 having a cycle of the detection window width Tw. du
ty is variable.

The recording signal 3004 output from the recording signal generation circuit 3003 in synchronization with the rise of the channel clock signal 3002 from the clock generation circuit 3001
Is input to the H-level period length measurement circuit 3005 and the L-level period length measurement circuit 3046.

The H level period length measuring circuit 3005 measures the length of the H level period of the recording signal 3004, and outputs the recording signal 3006 and the measurement result 3007 again. The measurement result 3007 is output in synchronization with the measured rise of the H level of the recording signal 3006. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T3101 is 2, and the measurement result 3007 becomes 2 at the rise of the H-level period T3101. The length of T3103 is 8, and the measurement result 3007 indicates the H level period T3.
It becomes 8 at the rise of 103.

The measurement result 3007 is input to the first delay circuit 3012 and the second delay circuit 3017.

The L-level period length measuring circuit 3046 measures the length of the L-level period of the recording signal 3004, and the measurement result 3
047 is output. The measurement result 3047 is the recording signal 30
06 is output in synchronization with the rise of the H level immediately before the measured L level. That is, if the length of the L level period is expressed by the number of channel clocks, L
The length of the level period T3102 is 4, and the measurement result 30
47 is 4 at the rise of the H level period T3101 immediately before the L level, the length of the L level period T3104 is 3, and the measurement result 3047 is the immediately preceding H level period T3101.
It becomes 3 at the rise of 103.

Then, the measurement result 3047 is input to the second delay circuit 3017.

In the first delay circuit 3012, the measurement result 30
07 is input to the first memory 3013 and the first memory 30
13 outputs a first memory output 3014. Here, as shown in Table 14 (a), the first memory 3013 stores a value corresponding to the length of the current recording mark (corresponding to the measurement result 3007). Is output.

In the second delay circuit 3017, the measurement result 30
07 and 3047 are input to the second memory 3018, and the second
A second memory output 3019 is output from the memory 3018. Here, as shown in Table 14 (b), the length of the current recording mark (the measurement result 30) is stored in the second memory 3018.
07 (corresponding to the measurement result 3047) and the length of the non-recorded portion immediately after (corresponding to the measurement result 3047), and the corresponding stored value is output.

On the other hand, the recording signal 3006 is divided by a pulse dividing circuit 3008 into a leading pulse 3009 and an intermediate pulse 301.
It is divided into 0 and the last pulse 3011. In this example, the first pulse 3009 rises at the rise of the recording signal 3006 and falls after Tw, and the intermediate pulse 3010 rises Tw after the rise of the recording signal 3006 and falls Tw before the fall of the recording signal 3006. The last pulse 3011 is a signal which rises before Tw of the fall of the recording signal 3006 and falls at the fall of the recording signal 3006. When the H level period of the recording signal 3006 is 2 Tw, no intermediate pulse is generated.

The first pulse 3009 is supplied to the first variable delay 3
At 015, the first memory output 3014 is delayed and the signal 3
016.

[0410] The intermediate pulse 3010 is input to the multi-pulse generation circuit 3022, becomes an intermediate multi-pulse 3025, is delayed by the fixed delay unit 3026 having the delay amount K, and
027.

[0411] The last pulse 3011 becomes the last multipulse 3031 in the multipulse generation circuit 3028.
The signal 3033 is selected by the selector 3032 and delayed by the second variable delay 3020 in accordance with the second memory output 3019 to become the signal 3021.

Signal 3016, signal 3027, and signal 302
The output 3035 of the OR circuit 3034 of the selector 1 is the selector 3
038, input to the laser drive circuit 3040,
When the light source is driven, an optical drive waveform 3041 is formed, and recording marks 3101 and 3102 are formed.

Next, the case where the switch 3044 is ON will be described with reference to FIG.

The gate generation circuit 3042 calculates the measurement result 30
H level is output only when 07 is 2. Therefore, when the select signal 3045 indicates that the measurement result 3007 is 2,
It becomes H level, and the selectors 3032 and 3038 select and output the Y input. Therefore, the last pulse 3011
Is input to the second variable delay device 3020, is delayed, and the signal 3
021 and the output 3037 of the signal 3021 and the signal 3016 by the AND circuit 3036 is guided to the laser drive circuit 3040. Therefore, when the mark to be recorded is 2 Tw, a pulse width smaller than Tw can be created,
Can handle even smaller marks.

When the measurement result 3007 is other than 2, it is the same as when the switch 3044 is OFF.

As described above, in the fourteenth embodiment, when the recording mark 3101 or 3102 is formed,
It is driven by a plurality of pulses, and according to the length of the recording mark to be recorded, the driving start time of the first pulse is delayed to correct the difference in the thermal history of the mark start part due to the recording mark length. Can be formed at the correct position, and according to the combination of the length of the recording mark to be recorded and the length of the non-recording portion immediately after, the driving of the last pulse is terminated early, and the length of the recording mark depends on the length. Since the difference in the heat accumulation at the mark end portion and the difference in the thermal history at the mark end portion due to the length of the non-recording portion immediately after are corrected, the end portion of the recording mark can also be formed at the correct position. Further, by driving in a plurality of pulses, the heat load applied to the medium can be reduced, and there is also an effect of reducing deterioration due to repeated recording.

[0417] Various pulse patterns can be handled by changing the method of dividing the leading pulse, the intermediate pulse, and the last pulse by the pulse dividing circuit.

[0418] Here, the optical drive waveform is driven between the recording power and the erasing power, but if it is driven in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 15) Optical drive waveform 332 in FIG.
Reference numeral 1 denotes an optical drive waveform according to Embodiment 15 of the present invention.
In the optical drive waveform 3321, the drive start time at the recording power is delayed and the drive end time is earlier than the reference signal 3400 obtained by delaying the recording signal 3306 by a fixed amount K.

In the case of (1, 7) modulation as an example, the delay amount of the drive start time is, as shown in Table 15 (a), the length of the recording mark to be recorded and the length of the immediately preceding non-recording portion. It is determined according to the combination of the sizes.

[0421]

[Table 15]

For example, the length of the non-recording portion immediately before the recording mark 3401 should be T3401 = 3Tw,
Since the length to be recorded is T3402 = 2 Tw (Tw is the detection window width), the driving start time of the recording power of the optical driving waveform 3321 is delayed by B15 (3, 2), and the non-recording immediately before the recording mark 3402 is performed. The length of the part should be T340
3 = 4Tw, and the length to be recorded is T3404 = 8T
Since it is w, the drive start time of the recording power of the optical drive waveform 3321 is delayed by B15 (4, 8).

The delay amount of the drive end time is determined according to the length of a recording mark to be recorded, as shown in Table 15 (b), in the case of (1,7) modulation as an example.

For example, since the recording length of the recording mark 3401 is T3402 = 2 Tw (Tw is the width of the detection window), the driving end time of the recording power of the optical driving waveform 3321 ends earlier by E15 (2). Since the recording length of the recording mark 3402 is T3404 = 8Tw, the driving end time of the recording power of the optical driving waveform 3321 is E15.
(8) End early.

If the length of the mark to be recorded is the same, the shorter the length of the immediately preceding non-recorded portion is, the greater the thermal effect of the previous recording power on the current mark start end is,
The extension of the mark start becomes large. Therefore, B15
(2, N)> B15 (3, N) >>...> B15 (8,
N) (N is an integer from 2 to 8).

If the length of the immediately preceding non-recording portion is the same, the shorter the length of the mark to be recorded, the easier it is to obtain the rapid cooling condition after the temperature rise at the start portion of the mark. , The extension of the mark start end becomes large. Therefore, B15 (N, 2)> B15 (N, 3)>.
B15 (N, 8) (N is an integer from 2 to 8).

The longer the mark length to be recorded, the greater the effect of heat accumulation at the end of the mark, and the greater the extension of the end. Therefore, E15 (8)> E15 (7)> ...
> E15 (2).

As a result, it is possible to correct the difference in the thermal effect of the previous recording power at the start of the mark due to the length of the immediately preceding non-recorded portion and the difference in the thermal history at the start of the mark due to the recording mark length. Formed in the correct position.
Further, since the difference in heat accumulation at the mark end portion due to the recording mark length can be corrected, the mark end portion is formed at a correct position.

Although the optical driving waveform 3321 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 33 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 15 of the present invention.

In FIG. 33, 3301 is a clock generation circuit, 3302 is a clock signal, 3303 is a recording signal generation circuit, 3304 is a recording signal output from the recording signal generation circuit 3303, 3305 is an H level period length measurement circuit,
306 is a recording signal after passing through the H level period length measuring circuit 3305, 3307 is an H level period measurement result output, 330
8 is a first delay circuit, 3309 is a first memory, 3310 is a first memory output, 3311 is a first variable delay, 3312
Is its output, 3313 is the second delay circuit, 3314 is the second delay circuit
Memory, 3315 is a second memory output, 3316 is a second variable delay, 3317 is its output, 3318 is an AND circuit, 3319 is its output, 3320 is a laser drive circuit,
3321 is an optical drive waveform, 3322 is an L level period length measuring circuit, and 3323 is a measurement result output.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 3301 outputs a channel clock 3302 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 3304 output from the recording signal generation circuit 3303 in synchronization with the rise of the channel clock signal 3302 from the clock generation circuit 3301
Is input to the H-level period length measurement circuit 3305 and the L-level period length measurement circuit 3322.

The H level period length measuring circuit 3305 measures the length of the H level period of the recording signal 3304, and outputs the recording signal 3306 and the measurement result 3307 again. The measurement result 3307 is output in synchronization with the rising of the measured H level of the recording signal 3306. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T3402 is 2, and the measurement result 3307 becomes 2 at the rise of the H-level period T3402. The length of T3404 is 8, and the measurement result 3307 indicates the H level period T3.
It becomes 8 at the rise of 404.

The measurement result 3307 is input to the first delay circuit 3308 and the second delay circuit 3313.

The L level period length measuring circuit 3322 measures the length of the L level period of the recording signal 3304, and
323 is output. The measurement result 3323 is a
06 is output in synchronization with the rise of the H level immediately after the measured L level. That is, if the length of the L level period is expressed by the number of channel clocks, L
The length of the level period T3401 is 3, and the measurement result 33
23 is an H level period T340 immediately after the L level period.
It becomes 3 at the rise of 2 and the length of the L level period T3403 is 4, and the measurement result 3323 becomes 4 at the rise of the H level period T3404 immediately after.

Then, the measurement result 3323 is input to the first delay circuit 3308.

In the first delay circuit 3308, the measurement result 33
07, 3323 are input to the first memory 3309, and the first
The memory 3309 outputs a first memory output 3310. Here, as shown in Table 15 (a), the length of the immediately preceding unrecorded portion (the measurement result 332) is stored in the memory 3309.
3) and the length of the current recording mark (corresponding to the measurement result 3307) are stored, and the corresponding stored value is output. The first variable delay unit 3311 delays the recording signal 3306 and outputs a signal 3312 according to the first memory output 3310.

In the second delay circuit 3313, the measurement result 3307 is input to the second memory 3314, and the second memory 3314 outputs the second memory output 3315.
Here, as shown in Table 15 (b), the length of the current recording mark (the measurement result 330
7), and the corresponding stored value is output. The second variable delay unit 3316 delays the recording signal 3306 and outputs a signal 3317 according to the second memory output 3315.

[0441] The signal 3312 and the signal 3317 are input to an AND circuit 3318, and output as a signal 3319.

The output signal 3319 is input to the laser drive circuit 3320 to drive the light source and generate the light drive waveform 3
321 and recording marks 3401 and 3402 are formed.

As described above, in the fifteenth embodiment, when forming the recording marks 3401 and 3402, recording is performed according to the combination of the length of the immediately preceding non-recording portion and the length of the current recording mark. By delaying the drive start time with power, the difference between the thermal effect at the mark start end due to the length of the immediately preceding unrecorded portion and the difference between the thermal history at the mark start end due to the length of the current recorded mark is corrected. ,
The start end of the recording mark can be formed at a correct position. In addition, the drive end time at the recording power is ended earlier according to the length of the recording mark to be recorded, and the difference in heat accumulation at the end of the mark due to the length of the recording mark is corrected. The part can be formed in the correct position.

In this case, the optical driving waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 16) Optical drive waveform 354 in FIG.
Reference numeral 1 denotes an optical drive waveform in Example 16 of the present invention.

[0446] The light drive waveform 3541 is composed of a plurality of pulses. Furthermore, the optical drive waveform 3541 has a drive start time of the first pulse delayed and a drive end time of the last pulse advanced with respect to a signal 3600 obtained by delaying the recording signal 3506 by a fixed amount K. .

The driving start delay amount of the first pulse is (1,
7) Taking modulation as an example, as shown in Table 16 (a), it is determined according to the combination of the length of the immediately preceding non-recording portion and the length of the recording mark to be recorded.

[0448]

[Table 16]

For example, the desired length of the non-recording portion immediately before the recording mark 3601 is T3601 = 2Tw,
Since the length to be recorded is T3602 = 2 Tw (Tw is the detection window width), the recording start time is delayed by B16 (2, 2), and the desired length of the non-recording portion immediately before the recording mark 3602 is T3603. = 4Tw and the length to be recorded is T3604 = 8Tw, so the recording start time is B1
6 (4, 8).

The drive end delay amount of the last pulse is (1,
7) Taking modulation as an example, as shown in Table 16 (b), it is determined according to the length of a recording mark to be recorded.

For example, since the recording length of the recording mark 3601 is T3602 = 2 Tw (Tw is the detection window width), the end time is earlier by E16 (2), and the recording length of the recording mark 3602 is Since T3604 = 8Tw, the end time is advanced by E16 (8).

If the length of the mark to be recorded is the same, the shorter the length of the immediately preceding non-recorded portion, the greater the thermal effect of the previous recording power on the beginning of the current recording mark, and the greater the extension of the beginning of the mark. Become. Therefore, B16
(2, N)> B16 (3, N) >>...> B16 (8,
N) (N is an integer from 2 to 8).

If the length of the immediately preceding unrecorded portion is the same,
The shorter the length of the mark to be recorded, the easier it is to obtain the rapid cooling condition at the start of the mark. In the case of a phase change medium that forms a mark by rapid cooling after temperature rise, the extension of the start of the mark is large. Therefore, B16 (N, 2)> B14 (N,
3) >> B14 (N, 8).

As the length of the mark to be recorded is longer, the influence of heat accumulation at the end of the mark is greater, and the extension of the end is greater. Therefore, E16 (8)> E16 (7)>...
> E16 (2) (N is an integer of 2 to 8).

As a result, it is possible to correct the difference in the thermal effect at the start of the mark due to the length of the immediately preceding non-recorded portion and the difference in the thermal history at the start of the mark due to the length of the recorded mark. Since the difference in heat accumulation can also be corrected, the starting portions of the recording marks 3601, 3602,
The terminal portion is formed in the correct position.

Although the optical driving waveform 3541 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium, such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 35 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 16 of the present invention.

In FIG. 35, reference numeral 3501 denotes a clock generation circuit, 3502 denotes a clock signal, 3503 denotes a recording signal generation circuit, 3504 denotes a recording signal output from the recording signal generation circuit 3503, 3505 denotes an H level period length measurement circuit,
506 is a recording signal after passing through the H level period length measuring circuit 3505, 3507 is an H level period measurement result output, and 350
8 is a pulse dividing circuit, 3509 is a leading pulse, 3510
Is an intermediate pulse, 3511 is a last pulse, 3512 is a first delay circuit, 3513 is a first memory, 3514 is a first memory output, 3515 is a first variable delay, 3516 is its output, 3517 is a second delay circuit, 3518 Is a second memory, 3519 is a second memory output, 3520 is a second variable delay, 3521 is its output, 3522 is a multi-pulse generating circuit, 3523 is an inverting circuit, 3524 is an AND circuit,
3525 is an intermediate multipulse, 3526 is a fixed delay unit,
3527 is its output, 3528 is a multi-pulse generation circuit, 3529 is an inversion circuit, 3530 is an AND circuit,
31 is the last multipulse, 3532 is a selector, 35
33 is its output, 3534 is an OR circuit, 3535 is its output, 3536 is an AND circuit, 3537 is its output,
538 is a selector, 3539 is its output, 3540 is a laser drive circuit, 3541 is an optical drive waveform, 3542 is a gate generation circuit, 3543 is its output, 3544 is a switch, and 3545 is a select signal. Here, the selectors 3532 and 3538 select and output the X input when the select signal 3545 is at the L level, and select and output the Y input when the select signal 3545 is at the H level. Further, reference numeral 3546 denotes an L-level period length detection circuit, and reference numeral 3547 denotes a measurement result output.

First, the operation when the switch 3544 is turned off, that is, when the select signal 3545 is at the L level, will be described with reference to the timing chart of FIG.

The clock generation circuit 3501 outputs a channel clock 3502 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 3504 output from the recording signal generation circuit 3503 in synchronization with the rise of the channel clock signal 3502 from the clock generation circuit 3501
Is input to the H-level period length measurement circuit 3505 and the L-level period length measurement circuit 3546.

The H level period length measuring circuit 3505 measures the length of the H level period of the recording signal 3504, and outputs the recording signal 3506 and the measurement result 3507 again. The measurement result 3507 is output in synchronization with the rise of the measured H level of the recording signal 3506. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T3602 is 2, and the measurement result 3507 becomes 2 at the rise of the H-level period T3602. The length of T3604 is 8, and the measurement result 3507 indicates the H level period T3.
It becomes 8 at the rise of 604.

Then, the measurement result 3507 is input to the first delay circuit 3512 and the second delay circuit 3517.

[0464] The L level period length measuring circuit 3546 measures the length of the L level period of the recording signal 3504, and the measurement result 3
547 is output. The measurement result 3547 is the recording signal 35
06 is output in synchronization with the rise of the H level immediately after the measured L level. That is, if the length of the L level period is expressed by the number of channel clocks, L
The length of the level period T3601 is 2, and the measurement result 35
47 is 2 at the rise of the H-level period T3602 immediately after the L-level, the length of the L-level period T3603 is 4, and the measurement result 3547 is the immediately following H-level period T3.
It becomes 4 at the rise of 604.

Then, the measurement result 3547 is input to the first delay circuit 3512.

In the first delay circuit 3512, the measurement result 35
07, 3547 are input to the first memory 3513, and the first
The memory 3513 outputs a first memory output 3514. Here, as shown in Table 16 (a), the first memory 3513 stores the length of the immediately preceding non-recorded portion (measurement result 35
47) and the length of the current recording mark (corresponding to the measurement result 3507) are stored, and the corresponding stored value is output.

In the second delay circuit 3517, the measurement result 35
07 is input to the second memory 3518 and the second memory 3518
18 outputs a second memory output 3519. Here, as shown in Table 16 (b), the second memory 3518 stores a value corresponding to the length of the current recording mark (corresponding to the measurement result 3007). Is output.

On the other hand, the recording signal 3506 is divided by a pulse dividing circuit 3508 into a leading pulse 3509 and an intermediate pulse 351.
It is divided into 0 and the last pulse 3511. In this example, the leading pulse 3509 rises at the rise of the recording signal 3506 and falls after Tw, and the intermediate pulse 3510 rises Tw after the rise of the recording signal 3506 and falls before Tw of the fall of the recording signal 3506. The last pulse 3511 is a signal that rises Tw before the fall of the recording signal 3506 and falls at the fall of the recording signal 3506. When the H level period of the recording signal 3506 is 2 Tw, no intermediate pulse is generated.

The first pulse 3509 is supplied to the first variable delay 3
At 515, the first memory output 3514 is delayed and the signal 3
516.

The intermediate pulse 3510 is input to a multi-pulse generation circuit 3522, becomes an intermediate multi-pulse 3525, is delayed by a fixed delay unit 3526 having a delay amount K, and
527.

[0471] The last pulse 3511 becomes the last multi-pulse 3531 in the multi-pulse generation circuit 3528.
The signal is selected by the selector 3532 and becomes a signal 3533, and is delayed by the second variable delay device 3520 according to the second memory output 3519 to become a signal 3521.

[0472] Signal 3516, signal 3527, and signal 352
The output 3535 from the OR circuit 3534 of the selector 1 is the selector 3
Selected at 538 and input to the laser drive circuit 3540,
The light source is driven to have an optical drive waveform 3541, and recording marks 3601 and 3602 are formed.

Next, the case where the switch 3544 is ON will be described with reference to FIG.

The gate generation circuit 3542 calculates the measurement result 35
H level is output only when 07 is 2. Therefore, when the select signal 3545 indicates that the measurement result 3507 is 2,
It becomes H level, and the selectors 3532 and 3538 select and output the Y input. Therefore, the last pulse 3511
Is input to the second variable delay device 3520, is delayed, and the signal 3
521, and the output 3537 of the signal 3521 and the signal 3516 by the AND circuit 3536 is guided to the laser drive circuit 3540. Therefore, when the mark to be recorded is 2 Tw, a pulse width smaller than Tw can be created,
Can handle even smaller marks.

When the measurement result 3507 is other than 2, it is the same as when the switch 3544 is OFF.

As described above, in the sixteenth embodiment, when forming the recording mark 3601 or 3602,
Drive by a plurality of pulses, delay the drive start time of the first pulse according to the combination of the length of the previous non-recorded part and the length of the recording mark to be recorded, and shorten the length of the immediately preceding non-recorded part. The difference between the thermal effect of the previous recording power and the difference in the thermal history of the start of the mark due to the length of the recording mark can be corrected.
In addition, the drive of the last pulse is terminated early according to the length of the recording mark to be recorded, and the difference in heat accumulation at the end of the mark due to the length of the recording mark is corrected. It can be formed in the correct position. Further, by driving in a plurality of pulses, the heat load applied to the medium can be reduced, and there is also an effect of reducing deterioration due to repeated recording.

By changing the method of dividing the leading pulse, intermediate pulse, and last pulse by the pulse dividing circuit, various pulse patterns can be handled.

Although the optical driving waveform is driven between the recording power and the erasing power in this case, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 17) Optical drive waveform 382 in FIG. 39
Reference numeral 1 denotes an optical drive waveform according to the seventeenth embodiment of the present invention.
In the optical drive waveform 3821, the drive start time at the recording power is delayed and the drive end time is earlier than the reference signal 3900 obtained by delaying the recording signal 3806 by a fixed amount K.

In the case of the (1, 7) modulation as an example, the delay amount of the drive start time is, as shown in Table 17 (a), the length of the recording mark to be recorded and the length of the immediately preceding non-recording portion. It is determined according to the combination of the sizes.

[0481]

[Table 17]

For example, the desired length of the non-recording portion immediately before the recording mark 3901 is T3901 = 2Tw,
Since the length to be recorded is T3902 = 2 Tw (Tw is the detection window width), the driving start time of the recording power of the optical driving waveform 3821 is delayed by B17 (2, 2), and the non-recording time immediately before the recording mark 3902 is not recorded. The length of the part should be T390
3 = 4Tw, and the length to be recorded is T3904 = 8T
Since it is w, the drive start time of the recording power of the optical drive waveform 3821 is delayed by B17 (4, 8).

In the case of the (1, 7) modulation as an example, the delay amount of the drive end time is, as shown in Table 17 (b), the length of the recording mark to be recorded and the length of the non-recording part immediately after it. It is determined according to the combination of the sizes.

For example, the length of the recording mark 3901 to be recorded is T3902 = 2 Tw (Tw is the width of the detection window), and the length of the immediately following non-recording portion is T3903 = 4.
Tw, the drive end time of the recording power of the optical drive waveform 3821 ends earlier by E17 (2, 4), the length of the recording mark 3902 to be recorded is T3904 = 8Tw, The desired length is T3905 =
Since it is 3 Tw, the drive end time of the recording power of the optical drive waveform 3821 ends earlier by E17 (8, 3).

If the length of the mark to be recorded is the same, the shorter the length of the immediately preceding non-recorded portion is, the greater the thermal effect of the previous recording power on the current mark start end is,
The extension of the mark start becomes large. Therefore, B17
(2, N)> B17 (3, N) >> ... B17 (8,
N) (N is an integer from 2 to 8).

If the length of the immediately preceding non-recording portion is the same, the shorter the length of the mark to be recorded, the easier it is to obtain the rapid cooling condition after the temperature rise at the beginning of the mark. , The extension of the mark start end becomes large. Therefore, B17 (N, 2)> B17 (N, 3)>.
B17 (N, 8) (N is an integer of 2 to 8).

If the length of the immediately following unrecorded portion is the same, the longer the mark length to be recorded, the greater the effect of heat accumulation at the mark end portion and the greater the extension of the end. Therefore, E17 (8, N)> E17 (7, N)>
-> E17 (2, N) (N is an integer of 2 to 8).

If the length of the mark to be recorded is the same, the shorter the length of the immediately following non-recorded portion, the more difficult it is for the temperature of the end portion of the mark to decrease, and the greater the extension of the end portion. Therefore, E17 (N, 2)> E17 (N, 3)>.
E17 (N, 8) (N is an integer from 2 to 8).

As a result, it is possible to correct the difference in the thermal effect of the previous recording power at the beginning of the mark due to the length of the immediately preceding non-recorded portion and the difference in the thermal history at the beginning of the mark due to the length of the recording mark. Is formed in the correct position. In addition, the difference in heat accumulation at the mark end portion due to the length of the recording mark and the difference in the thermal history at the mark end portion due to the length of the immediately following non-recorded portion can be corrected, so that the mark end portion is formed at the correct position.

Although the optical drive waveform 3821 is driven between the recording power and the erasing power here, it is adjusted according to the recording medium such as between the recording power and the reproducing power or between the recording power and 0. It only has to be driven.

FIG. 38 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 17 of the present invention.

In FIG. 38, reference numeral 3801 denotes a clock generation circuit, 3802 denotes a clock signal, 3803 denotes a recording signal generation circuit, 3804 denotes a recording signal output from the recording signal generation circuit 3803, 3805 denotes an H level period length measurement circuit,
806 is a recording signal after passing through the H level period length measuring circuit 3805, 3807 is an H level period measurement result output, 380
8 is a first delay circuit, 3809 is a first memory, 3810 is a first memory output, 3811 is a first variable delay, 3812
Is its output, 3813 is the second delay circuit, 3814 is the second delay circuit
A memory, 3815, a second memory output, 3816, a second variable delay, 3817, its output, 3818, an AND circuit, 3819, its output, 3820, a laser driving circuit,
Reference numeral 3821 denotes an optical drive waveform, 3822 denotes an L-level period length measurement circuit 1, 3823 denotes a measurement result output, 3824 denotes an L-level period length measurement circuit 2, and 3825 denotes a measurement result output.

The operation of the above configuration will be described with reference to the timing chart of FIG.

The clock generation circuit 3801 outputs a channel clock 3802 whose cycle is the detection window width Tw. du
ty is variable.

The recording signal 3804 output from the recording signal generating circuit 3803 in synchronization with the rise of the channel clock signal 3802 from the clock generating circuit 3801.
Are the H level period length measuring circuit 3805, the L level period length measuring circuit 1 (3822), and the L level period length measuring circuit 2
(3824).

The L level period length measuring circuit 1 (3822) measures the length of the L level period of the recording signal 3804, and outputs a measurement result 3823. The measurement result 3823 is output in synchronization with the rising of the H level immediately after the measured L level of the recording signal 3806. That is, if the length of the L-level period is represented by the number of channel clocks, the length of the L-level period T3901 is 2, and the measurement result 3823 indicates that the H-level period T390 immediately after the L-level period is used.
It becomes 2 at the rise of 3902, and the L level period T39
The length of 03 is 4, and the measurement result 3823 becomes 4 at the rise of the immediately after H level period T3904.

Then, the measurement result 3823 is input to the first delay circuit 3808.

The H level period length measuring circuit 3805 measures the length of the H level period of the recording signal 3804, and outputs the recording signal 3806 and the measurement result 3807 again. The measurement result 3807 is output in synchronization with the rise of the measured H level of the recording signal 3806. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T3902 is 2, and the measurement result 3807 becomes 2 at the rise of the H-level period T3902. The length of T3904 is 8, and the measurement result 3807 indicates the H level period T3.
It becomes 8 at the rise of 904.

[0499] The measurement result 3807 is input to the first delay circuit 3808 and the second delay circuit 3813.

The L level period length measurement circuit 2 (3824) measures the length of the L level period of the recording signal 3804, and outputs a measurement result 3825. The measurement result 3825 is output in synchronization with the rising of the H level immediately before the measured L level of the recording signal 3806. That is, if the length of the L-level period is represented by the number of channel clocks, the length of the L-level period T3903 is 4, and the measurement result 3825 indicates the H-level period T immediately before the L-level period.
It becomes 4 at the rising edge of 3902, and the L level period T39
The length of 05 is 3, and the measurement result 3825 becomes 3 at the rise of the H level period T3904 immediately after.

Then, the measurement result 3825 is input to the second delay circuit 3813.

In the first delay circuit 3808, the measurement result 38
07, 3823 are input to the first memory 3809, and the first
The memory 3809 outputs a first memory output 3810. Here, as shown in Table 17 (a), the first memory 3809 stores the length of the immediately preceding unrecorded portion (measurement result 38
23) and the length of the current recording mark (corresponding to the measurement result 3807) are stored, and the corresponding stored value is output. The first variable delay unit 3811 delays the recording signal 3806 and outputs a signal 3812 according to the first memory output 3810.

In the second delay circuit 3813, the measurement results 3807 and 3825 are input to the second memory 3814, and the second memory 3814 outputs the second memory output 3815. Here, in the second memory 3814, Table 17
As shown in (b), the value corresponding to the combination of the desired length of the current recording mark (corresponding to the measurement result 3807) and the desired length of the non-recorded portion immediately after (corresponding to the measurement result 3825) is obtained. Stored, and the corresponding stored value is output. The second variable delay 3816 has a second memory output 3815
, The recording signal 3806 is delayed and a signal 3817 is output.

[0504] The signal 3812 and the signal 3817 are input to an AND circuit 3818 and output as a signal 3819.

The output signal 3819 is input to the laser drive circuit 3820 to drive the light source and generate the light drive waveform 3
821, and recording marks 3901 and 3902 are formed.

As described above, in the seventeenth embodiment, when the recording marks 3901 and 3902 are formed, the recording is performed according to the combination of the length of the immediately preceding non-recording portion and the length of the current recording mark. Difference in the thermal effect at the start of the mark due to the difference in the length of the previous unrecorded part and the difference in the thermal history at the start of the mark due to the difference in the length of the current recorded mark by delaying the drive start time with power Is corrected, the starting end of the recording mark can be formed at a correct position. In addition, according to the combination of the length of the recording mark to be recorded and the length of the non-recording portion immediately after, the drive end time at the recording power ends earlier, and the end of the mark due to the difference in the length of the recording mark And the difference in heat history at the end of the mark due to the difference in the length of the non-recorded portion immediately after, so that the end of the recorded mark can be formed at the correct position.

Although the optical driving waveform is driven between the recording power and the erasing power here, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 18) Optical drive waveform 404 in FIG. 41
Reference numeral 1 denotes an optical drive waveform according to Example 18 of the present invention.

[0509] The light drive waveform 4041 is composed of a plurality of pulses. Further, with respect to the optical drive waveform 4041, the drive start time of the first pulse is delayed and the drive end time of the last pulse is earlier with respect to the signal 4100 obtained by delaying the recording signal 4006 by a fixed amount K. .

[0510] The drive start delay amount of the first pulse is (1,
7) Taking modulation as an example, as shown in Table 18 (a), the length is determined according to the combination of the length of the immediately preceding non-recorded portion and the length of the recording mark to be recorded.

[0511]

[Table 18]

For example, the desired length of the non-recording portion immediately before the recording mark 4101 is T4101 = 2Tw,
Since the length to be recorded is T4102 = 2 Tw (Tw is the detection window width), the recording start time is delayed by B18 (2, 2), and the length of the non-recording portion immediately before the recording mark 4102 is T4103. = 4Tw and the length to be recorded is T4104 = 8Tw, the recording start time is B1
8 (4, 8).

The drive end delay amount of the last pulse is (1,
7) Taking modulation as an example, as shown in Table 18 (b), the length is determined in accordance with the length of a recording mark to be recorded and the length of a non-recording portion immediately after it.

For example, the length of the recording mark 4101 to be recorded is T4102 = 2 Tw (Tw is the width of the detection window), and the length of the immediately following non-recording portion is T4103 = 4.
Since it is Tw, the end time is advanced by E18 (2, 4), and the length of the recording mark 4102 to be recorded is T410.
4 = 8 Tw, and the length of the non-recording portion immediately after is T4105 = 3 Tw, so the end time is E18
(8, 3) is faster.

If the length of the mark to be recorded is the same, the shorter the length of the immediately preceding non-recording portion, the greater the thermal effect of the previous recording power on the beginning of the current recording mark, and the greater the extension of the mark beginning. Become. Therefore, B18
(2, N)> B18 (3, N) >>...> B18 (8,
N) (N is an integer from 2 to 8).

[0516] If the length of the immediately preceding unrecorded portion is the same,
The shorter the length of the mark to be recorded, the easier it is to obtain the rapid cooling condition at the start of the mark. In the case of a phase change medium that forms a mark by rapid cooling after temperature rise, the extension of the start of the mark is large. Therefore, B18 (N, 2)> B18 (N,
3) >> B18 (N, 8).

If the length of the unrecorded portion immediately after is the same, the longer the length of the mark to be recorded, the greater the effect of heat accumulation at the end of the mark, and the greater the extension of the end. Therefore,
E18 (8, N)> E18 (7, N) >> ... E18
(2, N) (N is an integer from 2 to 8).

[0518] If the length of the mark to be recorded is the same, the shorter the length of the non-recording portion immediately after, the more difficult it is for the temperature of the mark end portion to decrease, and the larger the end extension. Therefore, E
18 (N, 2)> E18 (N, 3) >> ... E18
(N, 8) (N is an integer from 2 to 8).

As a result, it is possible to correct the difference in the thermal effect at the mark start end due to the difference in the length of the immediately preceding non-recorded portion and the difference in the thermal history at the mark start end due to the difference in the record mark length. The difference between the heat accumulation at the end of the mark due to the difference and the difference in the thermal history at the end of the mark due to the difference in the length of the non-recording portion immediately after can also be corrected. Formed in the correct position.

[0520] Here, the optical drive waveform 4041 is driven between the recording power and the erasing power. However, the optical driving waveform 4041 is driven between the recording power and the reproducing power, or between the recording power and 0, according to the recording medium. It only has to be driven.

FIG. 40 is a block diagram of a recording system of an optical disk device capable of obtaining an optical drive waveform according to Embodiment 18 of the present invention.

In FIG. 40, 4001 is a clock generation circuit, 4002 is a clock signal, 4003 is a recording signal generation circuit, 4004 is a recording signal output from the recording signal generation circuit 4003, 4005 is an H level period length measurement circuit,
006 is a recording signal after passing through the H level period length measuring circuit 4005, 4007 is an H level period measurement result output, 400
8 is a pulse dividing circuit, 4009 is a leading pulse, 4010
Is an intermediate pulse, 4011 is a last pulse, 4012 is a first delay circuit, 4013 is a first memory, 4014 is a first memory output, 4015 is a first variable delay, 4016 is its output, 4017 is a second delay circuit, 4018 Is a second memory, 4019 is a second memory output, 4020 is a second variable delay, 4021 is its output, 4022 is a multi-pulse generation circuit, 4023 is an inversion circuit, 4024 is an AND circuit,
4025 is an intermediate multi-pulse, 4026 is a fixed delay unit,
4027 is its output, 4028 is a multi-pulse generation circuit, 4029 is an inversion circuit, 4030 is an AND circuit,
31 is the last multipulse, 4032 is the selector, 40
33 is its output, 4034 is an OR circuit, 4035 is its output, 4036 is an AND circuit, 4037 is its output,
038 is a selector, 4039 is its output, 4040 is a laser drive circuit, 4041 is an optical drive waveform, 4042 is a gate generation circuit, 4043 is its output, 4044 is a switch, and 4045 is a select signal. Here, the selectors 4032 and 4038 select and output the X input when the select signal 4045 is at the L level, and select and output the Y input when the select signal 4045 is at the H level. Further, reference numeral 4046 denotes an L-level period length measuring circuit 1, 4047 denotes a measurement result output, 4
048 is an L level period length measuring circuit 2 and 4049 is the measurement result output.

First, the operation when the switch 4044 is OFF, that is, when the select signal 4045 is at the L level, will be described with reference to the timing chart of FIG.

[0524] The clock generation circuit 4001 outputs a channel clock 4002 whose cycle is the detection window width Tw. du
ty is variable.

[0525] The recording signal 4004 output from the recording signal generation circuit 4003 in synchronization with the rise of the channel clock signal 4002 from the clock generation circuit 4001.
Are the H-level period length measurement circuit 4005, the L-level period length measurement circuit 1 (4046), and the L-level period length measurement circuit 2
(4048).

The L-level period length measurement circuit 1 (4046) measures the length of the L-level period of the recording signal 4004 and outputs a measurement result 4047. The measurement result 4047 is output in synchronization with the rising of the H level immediately after the measured L level of the recording signal 4006. That is, if the length of the L-level period is represented by the number of channel clocks, the length of the L-level period T4101 is 2, and the measurement result 3407 indicates the H-level period T41 immediately after the L level.
02 at the rise of 02, and the L level period T4103
Is 4, and the measurement result 4047 becomes 4 at the rising of the immediately subsequent H level period T4104.

Then, the measurement result 4047 is inputted to the first delay circuit 4012.

The H level period length measuring circuit 4005 measures the length of the H level period of the recording signal 4004, and outputs the recording signal 4006 and the measurement result 4007 again. The measurement result 4007 is output in synchronization with the rise of the measured H level of the recording signal 4006. That is, if the length of the H-level period is represented by the number of channel clocks, the length of the H-level period T4102 is 2, the measurement result 4007 becomes 2 at the rise of the H-level period T4102, and the H-level period The length of T4104 is 8, and the measurement result 4007 indicates the H level period T4.
It becomes 8 at the rise of 104.

The measurement result 4007 is input to the first delay circuit 4012 and the second delay circuit 4017.

The L level period length measuring circuit 2 (4048) measures the length of the L level period of the recording signal 4004, and outputs a measurement result 4049. The measurement result 4049 is output in synchronization with the rise of the H level immediately before the measured L level of the recording signal 4006. That is, if the length of the L-level period is represented by the number of channel clocks, the length of the L-level period T4103 is 4, and the measurement result 4049 indicates the H-level period T41 immediately before the L-level.
At the rising edge of 02, it becomes 4 and the L level period T4105
Is 3, and the measurement result 4049 becomes 3 at the rise of the immediately preceding H level period T4104.

[0531] The measurement result 4049 is input to the second delay circuit 4017.

[0532] In the first delay circuit 4012, the measurement result 40
07 and 4047 are input to the first memory 4013, and the first
A first memory output 4014 is output from the memory 4013. Here, as shown in Table 18 (a), the first memory 4013 stores, as shown in Table 18 (a), the length of the last non-recorded portion (the measurement result 40).
47 (corresponding to 47) and the length of the current recording mark (corresponding to the measurement result 4007) are stored, and the corresponding stored value is output.

In the second delay circuit 4017, the measurement result 40
07, 4049 are input to the second memory 4018, and the second
A second memory output 4019 is output from the memory 4018. Here, as shown in Table 18 (b), the length of the current recording mark (the measurement result 40) is stored in the second memory 4018.
07 (corresponding to the measurement result 4049) and the length of the non-recorded portion immediately after (corresponding to the measurement result 4049), and the corresponding stored value is output.

On the other hand, the recording signal 4006 is divided into a leading pulse 4009 and an intermediate pulse 401 by a pulse dividing circuit 4008.
It is divided into 0 and last pulse 4011. In this example, the first pulse 4009 rises at the rise of the recording signal 4006 and falls after Tw, and the intermediate pulse 4010 rises Tw after the rise of the recording signal 4006 and falls Tw before the fall of the recording signal 4006. The last pulse 4011 is a signal which rises Tw before the fall of the recording signal 4006 and falls at the fall of the recording signal 4006. When the H level period of the recording signal 4006 is 2 Tw, no intermediate pulse is generated.

The first pulse 4009 is supplied to the first variable delay
At 015, the first memory output 4014 is delayed and the signal 4
016.

The intermediate pulse 4010 is input to a multi-pulse generation circuit 4022, becomes an intermediate multi-pulse 4025, is delayed by a fixed delay unit 4026 having a delay amount K, and
027.

[0537] The last pulse 4011 becomes the last multipulse 4031 in the multipulse generation circuit 4028.
The signal 4033 is selected by the selector 4032 and is delayed by the second variable delay device 4020 according to the second memory output 4019 to become the signal 4021.

[0538] Signals 4016, 4027, and 402
The output 4035 of the OR circuit 4034 of the selector 1 is the selector 4
038, input to the laser drive circuit 4040,
The light source is driven to have an optical drive waveform 4041, and recording marks 4101 and 4102 are formed.

[0539] Next, the case where the switch 4044 is ON will be described with reference to FIG.

The gate generation circuit 4042 calculates the measurement result 40
H level is output only when 07 is 2. Therefore, when the select signal 4045 indicates that the measurement result 4007 is 2,
It becomes H level, and the selectors 4032 and 4038 select and output the Y input. Therefore, the last pulse 4011
Is input to the second variable delay device 4020, is delayed, and the signal 4
021, and the output 4037 of the signal 4021 and the signal 4016 by the AND circuit 4036 is guided to the laser drive circuit 4040. Therefore, when the mark to be recorded is 2 Tw, a pulse width smaller than Tw can be created,
Can handle even smaller marks.

When the measurement result 4007 is other than 2, it is the same as when the switch 4044 is OFF.

As described above, in the eighteenth embodiment, when the recording mark 4101 or 4102 is formed,
Driving with multiple pulses, delaying the drive start time of the first pulse according to the combination of the length of the previous non-recorded portion and the length of the recording mark to be recorded, and The difference between the thermal effect of the previous recording power due to the difference in the recording power and the difference in the thermal history at the start of the mark due to the difference in the length of the recording mark can be corrected. The drive of the last pulse is terminated early according to the length to be recorded, and the difference in heat accumulation at the end of the mark due to the difference in the length of the recording mark and the end of the mark due to the difference in the length of the non-recording portion immediately after Since the difference in the thermal history is corrected, the end of the recording mark can also be formed at the correct position. Further, by driving in a plurality of pulses, the heat load applied to the medium can be reduced, and there is also an effect of reducing deterioration due to repeated recording.

By changing the method of dividing the leading pulse, intermediate pulse, and last pulse by the pulse dividing circuit, various pulse patterns can be handled.

[0544] Here, the optical drive waveform is driven between the recording power and the erasing power. However, if the driving is performed in accordance with the recording medium, such as between the recording power and the reproducing power, between the recording power and 0, or the like. Good.

(Embodiment 19) FIG. 43 shows a recording waveform of the optical information recording method according to the nineteenth embodiment of the present invention. (43a) is the modulation data at the maximum inversion interval (hereinafter referred to as Tmax), (43b) is the recording waveform for forming a recording mark corresponding to the modulation data (43a), and (43c) is formed. This is a recording mark.

(43d) is the minimum inversion interval (hereinafter Tmin)
(43e) is a recording waveform for forming a recording mark corresponding to the modulation data (43d), and (43f) is a recording mark to be formed.

[0547] The recording waveform (43b) is composed of the first pulse followed by (Tmax-Tmin) / Tw (Tw is the detection window width; hereinafter, represented by Tw) pulses, and the modulated data (43b) The interval between the rising edge (E1) of the first pulse 43a) and the rising edge (E2) of the first pulse is x (0 <x), and the rising edge (E1) of the modulation data (43a) and the first pulse Falling (E
3) is Tmin + y (y <0.5 Tw), and the rising (E1) of the modulation data (43a) and the first
The interval from the rising of the next succeeding pulse (E4) is Tm
in + 0.5Tw-z (0 ≦ z <0.5Tw),
The interval between the rising edge (E1) of the modulation data (43a) and the falling edge (E5) of the first subsequent pulse is Tmin.
+ Tw, and the rising edge (E) of the modulation data (43a)
1) and the rise of the n-th subsequent pulse (n is an integer,
The interval from 1 ≦ n ≦ (T−Tmin) / Tw) is Tmin
+ NTw-0.5Tw-z (0 ≦ z <0.5Tw), and the rise (E1) of the modulation data (43a) and the n-th
The interval from the falling edge of the next (n is an integer, 1 ≦ n ≦ (T−Tmin) / Tw) subsequent pulse is Tmin + nTw.

Therefore, the interval T1 between the falling edge (E3) of the first pulse and the rising edge (E4) of the first subsequent pulse is 0.5 Tw-zy, and the interval T2 between the subsequent pulses is Since 0.5 Tw-z, when y ≠ 0, a state of T1 ≠ T2 can be obtained.

Here, the recording mark (4
Since the elongation d1 in 3c) can be corrected, a recording mark having a length corresponding to Tmax can be correctly recorded.

When x is set, y may be set in a state of y = 0.

The recording waveform (43e) is composed of only the first pulse, and the rising edge (E6) of the modulation data (43d) and the rising edge (E6) of the first pulse.
7) is x (0 <x) set so that the mark of the maximum inversion interval is correctly recorded, and the modulation data (43)
The interval between the rise (E6) of d) and the fall (E8) of the first pulse is Tmin + y (y <0.5
Tw).

Here, the recording mark (43f) is Tmin
Can be set to have a length corresponding to

As described above, x can be set so that the length of the recording mark formed by the recording waveform (43b) corresponds to the maximum inversion interval Tmax. Since y can be set so that the length of the formed recording mark is equivalent to the minimum inversion interval Tmin, a desired mark length can be obtained. .

In the recording waveforms (43b) and (43e), the power is modulated between the peak power and the bias power. When recording on a write-once medium or a magneto-optical medium, the peak power is changed to the recording power. The bias power may be set to the reproduction power, and when recording on the phase change medium, the peak power may be set to the recording power and the bias power may be set to the erasing power.

FIG. 44 shows a recording waveform when the optical information recording method in the nineteenth embodiment is applied to (1, 7) modulation.

Here, Tmax = 8Tw, Tmin = 2
Tw, x = Tw, y = 0.25 Tw, and z = 0.

(44a) is the modulation data of the maximum inversion interval 8 Tw, and (44b) is the recording waveform for forming a recording mark corresponding to the modulation data (44a).

(44c) is 7 Tw modulated data.
(44d) is a recording waveform for forming a recording mark corresponding to the modulation data (44c).

(44e) is 6 Tw modulated data.
(44f) is a recording waveform for forming a recording mark corresponding to the modulation data (44e).

(44g) is 5 Tw modulated data.
(44h) is a recording waveform for forming a recording mark corresponding to the modulation data (44g).

(44i) is 4 Tw modulated data.
(44j) is a recording waveform for forming a recording mark corresponding to the modulation data (44i).

(44k) is 3 Tw modulated data.
(441) is a recording waveform for forming a recording mark corresponding to the modulation data (44k).

(44m) is the modulation data of the minimum inversion interval 2 Tw, and (44n) is a recording waveform for forming a recording mark corresponding to the modulation data (44m).

[0564] The recording waveform (44b) is composed of a first pulse followed by (8Tw-2Tw) / Tw = 6 subsequent pulses, and the rising edge of the modulation data (44a) and the first pulse are output. The interval between the rising edge of the pulse is x = Tw, and the interval between the rising edge of the modulation data (44a) and the falling edge of the first pulse is Tmin.
+ Y = 2.25Tw, and the interval between the rising edge of the modulation data (44a) and the rising edge of the nth subsequent pulse is Tmin + nTw-0.5Tw-z = (1.5 + n)
Tw, the rise of the modulation data (44a) and the n-th
The interval from the fall of the following pulse is Tmin + n
Tw = (2 + n) Tw.

The recording waveform (44d) is composed of the first pulse and the following (7Tw−2Tw) / Tw = 5 subsequent pulses. The recording waveform (44d) has the rising edge of the modulation data (44c) and the first pulse. The interval between the rising edge of the pulse is x = Tw, and the interval between the rising edge of the modulation data (44c) and the falling edge of the first pulse is Tmin.
+ Y = 2.25Tw, and the interval between the rising edge of the modulation data (44c) and the rising edge of the nth subsequent pulse is Tmin + nTw-0.5Tw-z = (1.5 + n)
Tw, the rise of the modulation data (44c) and the n-th
The interval from the fall of the following pulse is Tmin + n
Tw = (2 + n) Tw.

[0566] The recording waveform (44f) is composed of a first pulse followed by (6Tw-2Tw) / Tw = 4 subsequent pulses. The interval between the rising edge of the pulse is x = Tw, and the interval between the rising edge of the modulation data (44e) and the falling edge of the first pulse is Tmin.
+ Y = 2.25Tw, and the interval between the rising edge of the modulation data (44e) and the rising edge of the n-th subsequent pulse is Tmin + nTw-0.5Tw-z = (1.5 + n)
Tw, the rise of the modulation data (44e) and the n-th
The interval from the fall of the following pulse is Tmin + n
Tw = (2 + n) Tw.

The recording waveform (44h) is composed of a first pulse followed by (5Tw−2Tw) / Tw = 3 subsequent pulses. The rising edge of the modulation data (44g) and the first pulse The interval between the rising edge of the pulse is x = Tw, and the interval between the rising edge of the modulation data (44g) and the falling edge of the first pulse is Tmin.
+ Y = 2.25Tw, and the interval between the rising edge of the modulation data (44g) and the rising edge of the nth subsequent pulse is Tmin + nTw−0.5Tw−z = (1.5 + n)
Tw, the rise of the modulation data (44g) and the n-th
The interval from the fall of the following pulse is Tmin + n
Tw = (2 + n) Tw.

The recording waveform (44j) is composed of a first pulse followed by (4Tw−2Tw) / Tw = 2 subsequent pulses, and the rising edge of the modulation data (44i) and the first pulse The interval between the rising edge of the pulse is x = Tw, and the interval between the rising edge of the modulation data (44i) and the falling edge of the first pulse is Tmin.
+ Y = 2.25Tw, and the interval between the rising edge of the modulation data (44i) and the rising edge of the n-th subsequent pulse is Tmin + nTw-0.5Tw-z = (1.5 + n)
Tw, the rise of the modulation data (44i) and the n-th
The interval from the fall of the following pulse is Tmin + n
Tw = (2 + n) Tw.

The recording waveform (441) is composed of a first pulse followed by (3Tw−2Tw) / Tw = 1 subsequent pulses. The recording waveform (441) has a rising edge of the modulation data (44k) and the first pulse. The interval between the rising edge of the pulse is x = Tw, and the interval between the rising edge of the modulation data (44k) and the falling edge of the first pulse is Tmin.
+ Y = 2.25Tw, and the interval between the rise of the modulation data (44k) and the rise of the n-th subsequent pulse is Tmin + nTw-0.5Tw-z = (1.5 + n)
Tw, the rise of the modulation data (44k) and the n-th
The interval from the fall of the following pulse is Tmin + n
Tw = (2 + n) Tw.

The recording waveform (44n) is composed of only the first pulse, and the interval between the rise of the modulation data (44m) and the rise of the first pulse is x
= Tw, and the interval between the rise of the modulation data (44m) and the fall of the first pulse is Tmin +
y = 2.25 Tw.

In the above recording, the interval between the falling edge of the first pulse and the rising edge of the first subsequent pulse is 0.25 Tw, and the interval between subsequent pulses is 0.5 Tw. , They are different.

[0572] The result of measuring the length of the formed recording mark with respect to the modulation data inversion interval when actually recording on a rewritable phase change optical disk by the recording method of Fig. 44 is compared with the conventional method. As shown in FIG.

The recording film of the disk used was made of a GeTeSb-based material and had a thickness of 250 angstroms. Further, a ZnS-SiO2 mixed layer is provided above and below the recording film. The substrate used was a 5-inch polycarbonate substrate on which tracks had been formed in advance. By rotating this disk, at a linear velocity of 6 m / s, a laser wavelength of 830 nm,
Recording was performed with the shortest mark length of 0.8 μm (2 Tw, Tw = 67 ns) using a head having an objective lens of NA 0.5. The recording power is 15.6 mW and the erasing power is 8 mW.

In FIG. 45, white circles are the results of the conventional recording method, and a recording mark longer than the inversion interval in the modulation data is formed. On the other hand, the black circles are the results using the recording waveform of FIG. 44 which is an example of the present invention, and a recording mark having a length substantially equal to the inversion interval in the modulation data was formed. That is, a recording mark of a desired length was obtained.

As described above, according to this embodiment, the recording waveform for forming the recording mark corresponding to the inversion interval T is
First pulse followed by (T−Tmin) / Tw
(Tmin is the minimum inversion interval, Tw is the detection window width) and is composed of a plurality of pulse trains. The interval between the rising edge of the modulation data and the rising edge of the first pulse is x (0 <x). The interval between the rising edge of the modulation data and the falling edge of the first pulse is Tmin +
y (Tmin is the minimum inversion interval, y <0.5 Tw, Tw is the detection window width), and the rising edge of the modulation data and the n-th (n is an integer, 1 ≦ n ≦ (T−Tmin) / Tw, Tmi
n is the minimum inversion interval, and Tw is the detection window width) and the interval between the rising edge of the subsequent pulse is Tmin + nTw-0.5Tw-z.
(0 ≦ z <0.5 Tw, Tmin is the minimum inversion interval, Tw
Is the detection window width, and the rising edge of the modulation data and the n-th (n is an integer, 1 ≦ n ≦ (T−Tmin) / Tw, Tm
in is the minimum inversion interval, Tw is the interval between the fall of the subsequent pulse of the detection window width) and Tmin + nTw (Tmin is the minimum inversion interval, Tw is the detection window width), and the mark of the maximum inversion interval has a desired length. X is set to be formed, and y is set so that the mark of the minimum inversion interval is formed to a desired length.
, A mark of a desired length can be obtained.

FIG. 46 is a block diagram showing an optical information recording apparatus capable of obtaining a recording waveform according to the nineteenth embodiment of the present invention. In FIG. 46, reference numeral 4600 denotes a clock generator for generating a clock having a period equal to the detection window width;
Reference numeral 601 denotes a modulator for modulating input data, 4602 denotes a pulse generation circuit for outputting a pulse at a minimum inversion interval from the output of the modulator 4601, and 4603 denotes the pulse generation circuit 4
A first delay circuit 4604 that outputs a pulse obtained by delaying the rising edge of the output pulse of 602; a second delay circuit 4604 that outputs a pulse obtained by delaying the falling edge of the output pulse of the first delay circuit 4603; A multi-pulse generation circuit that outputs a plurality of pulse trains using the clock, the output of the modulator 4601, and the output of the pulse generation circuit 4602, 4606 is the second delay circuit 46
4607 is a laser drive circuit for driving the laser of the optical head using the output of the OR circuit 4606, and 4608 is an optical head. , 460
9 is an optical disk.

The operation of the optical information recording apparatus configured as described above will be described with reference to FIG.

The clock generator 4600 outputs a clock (47b) whose period is the detection window width Tw. The duty is variable.

The modulator 4601 operates according to the clock (47).
b) and outputs modulated data (47a) synchronized with the clock.

The pulse generation circuit 4602 receives the modulation data (47a) and outputs a pulse (47c) having a pulse width of the minimum inversion interval Tmin from the rise of the modulation data (47a).

[0591] The first delay circuit 4603 is connected to the pulse (4
7c) and outputs a first delay pulse (47d) obtained by delaying the rising edge of the pulse (47c) by x.

The second delay circuit 4604 receives the first delay pulse (47d) and inputs the first delay pulse (47d).
A second delay pulse (47e) is output by delaying the falling edge of d) by y.

[0583] The multi-pulse generation circuit 4605 receives the modulated data (47a), the pulse (47c) and the clock (47b) and receives the modulated data (47a) from the falling edge of the pulse (47c). A multi-pulse (47f) for outputting a signal having a phase opposite to that of the clock (47b) is output until the fall.

The OR circuit 4606 receives the second delay pulse (47e) and the multi-pulse (47f) and outputs a drive signal (47g).

The laser drive circuit 4608 drives the laser of the optical head 8 according to the drive signal (47g) as shown by the optical drive waveform (47h), and forms a recording mark on the optical disc 4609.

In the optical driving waveform (47h), the power is modulated between the peak power and the bias power.
When recording on a write-once medium or magneto-optical medium, set the peak power to the recording power, and set the bias power to the reproduction power.When recording on the phase change medium, set the peak power to the recording power and erase the bias power. Just set it to power.

With this configuration, the first delay pulse (47
The length of the recording mark corresponding to the maximum inversion interval can be set to a desired value by the delay amount x of d), and the length of the recording mark corresponding to the minimum inversion interval can be determined by the delay amount y of the second delay pulse (47e). The length can be set to a desired value.

[0588]

According to the first aspect of the present invention, when forming the current recording mark, the start time of light irradiation for forming the current recording mark is changed according to the length of the recording mark. . As a result, it is possible to correct the difference in the thermal history at the starting end portion due to the length of the recording mark, and to form the starting end portion of the current recording mark at a correct position.

In the second aspect of the invention, since the light source such as a laser emits a pulse light, when forming the current recording mark, the thermal effect when the recording mark immediately before the recording mark is formed is reduced. At the same time, the start time of at least the first pulse in the pulse emission for forming the current recording mark is changed according to the length of the current recording mark. As a result, it is possible to correct the difference in the thermal history at the start end portion due to the length of the current recording mark, so that the start end portion of the current recording mark can be formed at a correct position. Further, the pulsed light emission has an effect of reducing the heat load applied to the medium and reducing deterioration due to repeated recording.

In the third invention, when the current recording mark is formed, the current recording mark is formed according to the length of the non-recording area immediately before the recording mark and the length of the current recording mark. The start time of light irradiation when forming a recording mark is changed. As a result, it is possible to correct the influence of the heat at the time of forming the immediately preceding recording mark on the starting end of the current recording mark, and to correct the difference in the heat history at the mark starting end due to the length of the current recording mark. Therefore, it is possible to form the starting end of the current recording mark at the correct position.

[0591] In the fourth aspect, since the light source such as a laser emits pulse light, the thermal effect when the recording mark immediately before the current recording mark is formed is reduced when the current recording mark is formed. At the same time, the start of at least the first pulse in the pulse emission for forming the current recording mark according to the length of the area of the non-recording portion immediately before this recording mark and the length of the current recording mark The time changes. As a result, it is possible to correct the influence of the heat at the time of forming the immediately preceding recording mark on the starting end of the current recording mark, and to correct the difference in the heat history at the mark starting end due to the length of the current recording mark. Therefore, it is possible to form the starting end of the current recording mark at the correct position. Further, the pulsed light emission has an effect of reducing the heat load applied to the medium and reducing deterioration due to repeated recording.

In the fifth invention, when forming the current recording mark, the length of the area of the non-recording portion immediately before the recording mark and the immediately preceding recording position sandwiching the non-recording portion are set. The start time of light irradiation when forming the current recording mark is changed according to the length of the mark and the length of the current recording mark. As a result, it is possible to correct the influence of the heat at the time of forming the immediately preceding recording mark on the starting end of the current recording mark, and to correct the difference in the heat history at the mark starting end due to the length of the current recording mark. Therefore, it is possible to form the starting end of the current recording mark at the correct position.

In the sixth aspect, since the light source such as a laser emits a pulse, the heat effect when the recording mark immediately before the current recording mark is formed is reduced when the current recording mark is formed. In addition, the length of the area of the non-recording part immediately before this recording mark, the length of the immediately preceding recording mark positioned so as to sandwich the non-recording part, and the length of the current recording mark , The start time of at least the first pulse in the pulse emission for forming the current recording mark is changed. as a result,
In addition to correcting the effect of the heat generated when the previous recording mark was formed on the beginning of the current recording mark,
Since the difference in the thermal history at the mark start end portion due to the length of the current recording mark can be corrected, the start end portion of the current recording mark can be formed at a correct position. further,
The pulsed light emission also has the effect of reducing the heat load applied to the medium and reducing deterioration due to repeated recording.

In the seventh aspect, when forming the current recording mark, the end time of light irradiation in forming the current recording mark is changed according to the length of the recording mark. As a result, it is possible to correct the difference in heat accumulation at the end of the mark due to the length of the recording mark, so that the end of the current recording mark can be formed at a correct position.

In the eighth aspect, since the light source such as a laser emits pulse light, when forming the current recording mark, the thermal effect when the recording mark immediately before the recording mark is formed is reduced. At the same time, the end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the length of the current recording mark. As a result, it is possible to correct the difference in heat accumulation at the end of the mark due to the length of the recording mark, so that the end of the current recording mark can be formed at a correct position. Further, the pulsed light emission has an effect of reducing the heat load applied to the medium and reducing deterioration due to repeated recording.

In the ninth invention, when forming the current recording mark, the present recording mark is determined according to the desired length of the current recording mark and the desired length of the non-recording area immediately after the current recording mark. The end time of the light irradiation when the recording mark is formed is changed. As a result, the difference in heat accumulation at the mark end due to the length of the recording mark and the difference in heat history at the mark end due to the distance to the next recording mark can be corrected. It becomes possible to form parts.

In the tenth aspect, since the light source such as a laser emits a pulse, when forming the current recording mark, the thermal influence when the recording mark immediately before the recording mark is formed is reduced. At the same time, depending on the length of the current recording mark and the length of the non-recording area immediately after the current recording mark, at least the last pulse in the pulse emission for forming the current recording mark is used. The end time is changed. As a result, the difference in heat accumulation at the mark end due to the length of the recording mark and the difference in heat history at the mark end due to the distance to the next recording mark can be corrected. It becomes possible to form parts.

Further, the pulsed light emission has the effect of reducing the heat load applied to the medium and reducing the deterioration due to repeated recording.

In the eleventh invention, when forming the current recording mark, the length of the current recording mark should be
The start time of light irradiation when forming the current recording mark is changed, and the end time of light irradiation when forming the current recording mark is changed according to the length of the current recording mark. You. As a result, it is possible to correct the difference in heat history at the mark start end portion due to the length of the recording mark, and to correct the difference in heat accumulation at the mark end portion due to the length of the recording mark. The start and end portions can be formed.

In the twelfth aspect, since the light source such as a laser emits a pulse, the heat effect at the time of forming the recording mark immediately before the current recording mark is reduced when the current recording mark is formed. At the same time, the start time of at least the first pulse in the pulse emission for forming the current recording mark is changed according to the length of the current recording mark, and the length of the current recording mark is Accordingly, the end time of at least the last pulse in the pulse emission for forming the current recording mark is changed.
As a result, it is possible to correct the difference in heat history at the mark start end portion due to the length of the recording mark, and to correct the difference in heat accumulation at the mark end portion due to the length of the recording mark.
The start and end of the current recording mark can be formed at the correct positions.

[0601] Furthermore, the pulsed light emission has the effect of reducing the heat load applied to the medium and reducing the deterioration due to repeated recording.

In the thirteenth invention, when forming the current recording mark, the length of the current recording mark should be
The start time of light irradiation when forming the current recording mark is changed, and according to the length of the current recording mark and the length of the non-recording area immediately after the current recording mark. Then, the end time of light irradiation for forming the current recording mark is changed. As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the length of the recording mark, and to correct the difference in the heat accumulation at the mark end portion due to the length of the recording mark, and the distance from the next recording mark. Can correct the difference in the thermal history at the mark end portion, so that the start and end portions of the current recording mark can be formed at the correct positions.

In the fourteenth aspect, since the light source such as a laser emits a pulse light, the thermal effect when the recording mark immediately before the current recording mark is formed is reduced when the current recording mark is formed. Along with the length of the current recording mark, the start time of at least the first pulse in the pulse emission for forming the current recording mark is changed, and the length of the current recording mark and The end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the length of the non-recording area immediately after the current recording mark. As a result, it is possible to correct the difference in the thermal history at the mark start end portion due to the length of the recording mark, and to correct the difference in the heat accumulation at the mark end portion due to the length of the recording mark, and the distance from the next recording mark. Can correct the difference in the thermal history at the mark end portion, so that the start and end portions of the current recording mark can be formed at the correct positions.

Further, the pulsed light emission has the effect of reducing the heat load applied to the medium and reducing the deterioration due to repeated recording.

In the fifteenth aspect, when the current recording mark is formed, the current recording mark is formed according to the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. The start time of light irradiation when forming the recording mark is changed, and the end time of light irradiation when forming the current recording mark is changed according to the length of the current recording mark. . As a result, it is possible to correct the thermal effect on the starting end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark starting end due to the length of the recording mark, and Since the difference in heat accumulation at the end of the mark due to the length of the mark can be corrected, the start and end of the current recording mark can be formed at the correct positions.

In the sixteenth aspect, the light source such as a laser emits a pulse, so that when forming the current recording mark, the thermal effect when the recording mark immediately before the recording mark is formed is reduced. At the same time, at least the first pulse of the pulse emission for forming the current recording mark depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. The start time is changed, and the end time of at least the last pulse in the pulse emission for forming the current recording mark is changed according to the length of the current recording mark. As a result, it is possible to correct the thermal effect on the starting end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark starting end due to the length of the recording mark, and Since the difference in heat accumulation at the end of the mark due to the length of the mark can be corrected, the start and end of the current recording mark can be formed at the correct positions.

Furthermore, the pulsed light emission has the effect of reducing the heat load applied to the medium and reducing the deterioration due to repeated recording.

In the seventeenth aspect, when forming the current recording mark, the present recording mark is determined according to the length of the area of the non-recording portion immediately before the current recording mark and the length of the current recording mark. The start time of light irradiation when forming a recording mark is changed, and according to the length of the current recording mark and the length of the non-recording area immediately after the current recording mark, The end time of light irradiation for forming the current recording mark is changed. As a result, it is possible to correct the thermal effect on the start end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark start end due to the length of the recording mark,
In addition, the difference in heat accumulation at the end of the mark due to the length of the recording mark can be corrected, and the difference in the heat history at the end of the mark due to the distance to the next mark can be corrected. Can be formed.

In the eighteenth aspect, since the light source such as a laser emits a pulse light, when forming the current recording mark, the thermal effect when the recording mark immediately before the recording mark is formed is reduced. At the same time, at least the first pulse of the pulse emission for forming the current recording mark depends on the length of the non-recording area immediately before the current recording mark and the length of the current recording mark. The start time is changed, and pulse emission for forming the current recording mark is performed according to the desired length of the current recording mark and the desired length of the non-recording area immediately after the current recording mark. The end time of at least the last pulse in is changed. As a result, it is possible to correct the thermal effect on the starting end of the current recording mark due to the formation of the previous recording mark, and to correct the difference in the thermal history of the mark starting end due to the length of the recording mark, and The difference between the heat accumulation at the end of the mark due to the length of the mark and the difference in the heat history at the end of the mark due to the distance to the next mark can be corrected. It becomes possible to form parts.

Further, the pulsed light emission has the effect of reducing the heat load applied to the medium and reducing the deterioration due to repeated recording.

In the nineteenth aspect, the length of the recording mark corresponding to the maximum inversion interval and the minimum inversion interval can be set to a desired value.

Further, the pulsed light emission has the effect of reducing the heat load applied to the medium and reducing the deterioration due to repeated recording.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording system of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the apparatus shown in FIG. 1;

FIG. 3 is a block diagram of a recording system of an optical disc device according to a second embodiment of the present invention.

FIG. 4 is a timing chart for explaining the operation of the apparatus of FIG. 3;

FIG. 5 is a block diagram of a recording system of an optical disc device according to a third embodiment of the present invention.

FIG. 6 is a timing chart for explaining the operation of the apparatus of FIG. 5;

FIG. 7 is a block diagram of a recording system of an optical disc device according to a fourth embodiment of the present invention.

8 is a timing chart for explaining the operation of the device of FIG. 7;

FIG. 9 is a block diagram of a recording system of an optical disc device according to Embodiment 5 of the present invention.

FIG. 10 is a timing chart for explaining the operation of the apparatus of FIG. 9;

FIG. 11 is a block diagram of a recording system of an optical disc device according to a sixth embodiment of the present invention.

FIG. 12 is a timing chart for explaining the operation of the apparatus shown in FIG. 11;

FIG. 13 is a block diagram of a recording system of an optical disc device according to Embodiment 7 of the present invention.

FIG. 14 is a timing chart for explaining the operation of the apparatus shown in FIG. 13;

FIG. 15 is a block diagram of a recording system of an optical disc device according to Embodiment 8 of the present invention.

FIG. 16 is a timing chart for explaining the operation of the apparatus shown in FIG. 15;

FIG. 17 is a timing chart for explaining the operation of the apparatus shown in FIG. 15;

FIG. 18 is a block diagram of a recording system of an optical disc device according to Embodiment 9 of the present invention.

FIG. 19 is a timing chart for explaining the operation of the apparatus of FIG. 18;

FIG. 20 is a block diagram of a recording system of an optical disc device according to Embodiment 10 of the present invention.

21 is a timing chart for explaining the operation of the apparatus in FIG. 20;

FIG. 22 is a timing chart for explaining the operation of the apparatus in FIG. 20;

FIG. 23 is a block diagram of a recording system of an optical disc device according to Embodiment 11 of the present invention.

FIG. 24 is a timing chart for explaining the operation of the apparatus shown in FIG. 23;

FIG. 25 is a block diagram of a recording system of an optical disc device according to Embodiment 12 of the present invention.

FIG. 26 is a timing chart for explaining the operation of the apparatus of FIG. 25;

FIG. 27 is a timing chart for explaining the operation of the apparatus of FIG. 25;

FIG. 28 is a block diagram of a recording system of an optical disc device according to Embodiment 13 of the present invention.

FIG. 29 is a timing chart used for describing the operation of the device in FIG. 28.

FIG. 30 is a block diagram of a recording system of an optical disc device according to Embodiment 14 of the present invention.

FIG. 31 is a timing chart for explaining the operation of the apparatus of FIG. 30;

FIG. 32 is a timing chart used for describing the operation of the device in FIG. 30.

FIG. 33 is a block diagram of a recording system of an optical disc device according to Embodiment 15 of the present invention.

FIG. 34 is a timing chart used for describing the operation of the device in FIG. 33.

FIG. 35 is a block diagram of a recording system of an optical disc device according to Embodiment 16 of the present invention.

FIG. 36 is a timing chart for explaining the operation of the apparatus of FIG. 35;

FIG. 37 is a timing chart used for describing the operation of the device in FIG. 35.

FIG. 38 is a block diagram of a recording system of an optical disc device according to Embodiment 17 of the present invention.

FIG. 39 is a timing chart used for describing the operation of the device in FIG. 38.

FIG. 40 is a block diagram of a recording system of an optical disc device according to Embodiment 18 of the present invention.

FIG. 41 is a timing chart used for describing the operation of the device in FIG. 40.

FIG. 42 is a timing chart used for describing the operation of the device in FIG. 40.

FIG. 43 is a recording waveform chart according to the nineteenth embodiment of the present invention.

FIG. 44 is a recording waveform diagram in (1, 7) modulation in Example 19 of the present invention.

FIG. 45 is a diagram showing the length of a recording mark for modulated data in Embodiment 19 of the present invention.

FIG. 46 is a block diagram of an optical disc device according to Embodiment 19 of the present invention.

FIG. 47 is a timing chart used for describing the operation of the device in FIG. 46.

FIG. 48 is a recording waveform diagram in a conventional recording method.

[Explanation of symbols]

 4001 clock generation circuit 4003 recording signal generation circuit 4005 H level period length measurement circuit 4008 pulse division circuit 4012 first delay circuit 4017 second delay circuit 4022 multi-pulse generation circuit 4028 multi-pulse generation circuit 4034 OR circuit 4036 AND circuit 4040 laser drive circuit 4041 Optical drive waveform

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shunji Ohara 1006 Kadoma, Kadoma, Osaka Prefecture F-term (reference) in Matsushita Electric Industrial Co., Ltd. 5D090 AA01 BB03 BB04 CC01 EE01 KK05 5D119 AA23 BA01 BB02 BB03 DA01 HA25 HA28 HA60

Claims (2)

[Claims] 1. A method for recording optical information by forming a large number of recording marks on a recording medium by irradiating light from a light source such as a laser. The start time of the drive with the recording power of the light source for forming the current recording mark is changed according to the length of the recording mark, and the length of the current recording mark is changed according to the length. An optical information recording method comprising: changing the end time of driving with the recording power of the light source for forming a current recording mark. 2. A recording signal generating means for generating a recording signal, a first measuring means for measuring an output period of a recording signal for forming a current recording mark, and a measurement result of the first measuring means. First delay means for delaying the recording signal for recording the current recording mark, and delaying the recording signal for recording the current recording mark in accordance with the measurement result of the first measuring means. A second delay unit for driving the light source with the recording power from a rising edge of the recording signal after the delay by the first delay unit to a falling edge of the recording signal after the delay by the second delay unit; An optical information recording device, comprising: