JPH0773468A - Method and device for tentative write recording control - Google Patents

Abstract

PURPOSE:To set an accurate recording condition which is not affected by thermal interference by providing a repeat pattern level detecting means, an isolated pattern level detecting means, and a comparing means of both levels and setting the recording condition in accordance with the comparison result. CONSTITUTION:A repeat pattern level detecting means 1 detects a peak level V1 of the part of a reproduced signal W from a photodetector 22 corresponding to a repeat mark pattern. An isolated pattern level detecting means 2 detects a peak level V2 of the part of the reproduced signal W corresponding to an isolated mark pattern. A comparing means 3 outputs a level difference DELTAV between peak levels V1 and V2 to a repeat and isolated pattern generating means 4. Consequently, the intensity of a light beam and the pulse length are so set that the level difference DELTAV becomes minimum, thereby setting the recording condition for information recording under the same thermal interference. Thus, information is accurately recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trial writing recording control method and a trial writing recording control device for obtaining optimum recording conditions for an optical recording medium such as a magneto-optical disk on which information is recorded by a light beam. It is a thing.

[0002]

2. Description of the Related Art A trial write recording control method is a method of temporarily recording predetermined data on a magneto-optical disk and reading the recorded data to set an optimum laser power. IEICE Technical Report MR92-62
(19911-11), p. 13-18 or 1992
Proceedings of the IEICE Autumn Meeting, c-342, p. 5-
The trial write recording control method for the magneto-optical disk disclosed in No. 21 will be described with reference to FIG.

In this method, first, the recording mark 16 of the shortest mark repeating pattern X and the recording mark 17 of the longest mark repeating pattern Y are recorded on the magneto-optical disk. Then, the recording marks 16 and 17 are read out, and the voltage difference ΔV between the average voltage V1 of the reproduction signal W corresponding to the shortest mark repeating pattern X and the average voltage V2 of the reproduction signal W corresponding to the longest mark repeating pattern Y is obtained.

Recording is performed by controlling the power of the light beam so that the voltage difference ΔV becomes zero, so that the recording marks 16 and 16, the recording marks 16 and 17, and the recording marks 17 and 17 are recorded. The thermal interference between the recording marks or other recording marks becomes constant. Therefore, accurate recording can be performed.

Here, the thermal interference means that the heat when a certain recording mark is recorded has an influence when the next recording mark is recorded.

[0006]

However, the above-mentioned conventional structure has a problem that it is difficult to accurately make the thermal interference constant.

That is, the thermal interference between the recording marks 16 of the shortest mark repeating pattern X is caused by the reproduction signal W.
Of the longest mark repeating pattern Y on the other side, and thermal interference between the recording marks 17 of the longest mark repeating pattern Y causes lateral fluctuation of the reproduction signal W (time fluctuation). Therefore, the fluctuation amount of the average voltage V1 and the fluctuation amount of the average voltage V2 caused by thermal interference are different. Therefore, it is difficult to accurately know the thermal interference from the voltage difference ΔV, and there is a problem that the thermal interference does not always become constant even if the voltage difference ΔV becomes zero.

[0008]

In order to solve the above-mentioned problems, a trial writing recording control method according to the invention of claim 1
The level of the reproduction signal portion corresponding to the repetitive mark pattern and the level of the reproduction signal portion corresponding to the isolated mark pattern are detected from the optical recording medium on which information is recorded by the light beam, and the level difference is minimized. It is characterized by setting recording conditions.

In order to solve the above-mentioned problems, a trial write recording control apparatus according to a second aspect of the present invention has a level of a portion of a reproduction signal corresponding to a repetitive mark pattern from an optical recording medium on which information is recorded by a light beam. And a second level detecting means for detecting the level of a portion of the reproduction signal corresponding to the isolated mark pattern,
A comparison means for comparing the above levels is provided, and the recording condition is set according to the comparison result.

In order to solve the above-mentioned problems, a trial writing recording control device according to a third aspect of the present invention is the trial writing recording control device according to the second aspect, wherein the first level detecting means forms a repeating mark pattern. The envelope detection means for detecting the peak level of the portion of the corresponding reproduction signal,
The level detecting means comprises envelope detecting means for detecting the peak level of the portion of the reproduction signal corresponding to the isolated mark pattern, and the comparing means comprises a subtracter for outputting the level difference between the peak levels to minimize the level difference. The recording condition is set as described above.

In order to solve the above-mentioned problems, a trial write recording control device according to a fourth aspect of the present invention is the test write recording control device according to the second aspect, wherein the first and second level detecting means are: From a timing generating means for generating a timing signal for each peak of the reproduced signal and an A / D converter for extracting the peak level of the reproduced signal by A / D (analog / digital) converting the reproduced signal based on the timing signal. The comparison means is composed of a processor that outputs the level difference between the peak levels, and the recording condition is set so that the level difference is minimized.

In order to solve the above-mentioned problems, a trial write recording control device according to a fifth aspect of the present invention is the test write recording control device according to the second aspect, wherein the first level detecting means forms a repetitive mark pattern. The second level detecting means comprises an averaging means for detecting the average level of the corresponding reproduction signal portion, the second level detecting means comprises an averaging means for detecting the average level of the reproduction signal portion corresponding to the isolated mark pattern, and the comparing means. It is characterized by comprising a subtractor for outputting the level difference between the average levels, and setting the recording condition so as to minimize the level difference.

[0013]

According to the structure of the first aspect, both the thermal interference between the recording marks corresponding to the repeated mark pattern and the thermal interference between the recording marks corresponding to the isolated mark pattern cause a level fluctuation in the reproduced signal. Appears. Therefore, the level of the reproduction signal portion corresponding to the repeated mark pattern,
By detecting the level of the reproduction signal portion corresponding to the isolated mark pattern and comparing the levels, the difference in thermal interference can be known accurately. Therefore, the thermal interference between the recording marks corresponding to different mark patterns can be made the same. This makes it possible to set accurate recording conditions that are not affected by thermal interference.

According to the configuration of claim 2, it is possible to realize a trial writing recording control device adopting the trial writing recording control method of the first aspect.

According to the constitutions of claims 3 to 5, the trial write recording control device of claim 2 can be realized with a simple constitution.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to FIGS.

The trial writing recording control apparatus of this embodiment is shown in FIG.
, The semiconductor laser 23 and the level difference Δv
The recording signal z corresponding to the isolated mark pattern x and the repeated mark pattern y so that (described later) is minimized.
Is output to the semiconductor laser 23 and the repeating / isolated pattern generating means 4 is provided.

The semiconductor laser 23 emits a light beam a having an intensity and a pulse length according to the recording signal z, to the magneto-optical disk 2.
4 (optical recording medium), so that the recording marks 5 of the isolated mark pattern x and the recording marks 6 of the repeated mark pattern y are recorded on the magneto-optical disk as shown in FIG. Here, the isolated mark pattern x is
The recording marks 5, which are separated from each other, are patterns that are less likely to be affected by thermal interference, and the repetitive mark patterns y are the patterns, which are recording marks 6, which are closer to each other, more easily affected by thermal interference.

The trial write recording control apparatus further receives the reflected light b from the magneto-optical disk 24 and photoelectrically converts it to output a reproduction signal w, which is a photodetector 2.
2 and the reproduction signal w corresponding to the repeated mark pattern y
Repeated pattern level detecting means 1 (first level detecting means) for detecting the peak level v1 of the portion of the reproduced signal w and isolated pattern level detecting means 2 for detecting the peak level v2 of the portion of the reproduced signal w corresponding to the isolated mark pattern x. (Second level detecting means) and comparing means 3 for outputting the level difference Δv between the peak levels v1 and v2 to the repeating / isolated pattern generating means 4 described above.

In the above structure, when the recording marks 5 and the recording marks 6 are recorded by irradiating the magneto-optical disk 24 with the light beam a having the same intensity and the same pulse length, the recording marks are susceptible to thermal interference. 6 are larger than the recording marks 5 which are less susceptible to thermal interference, as shown by the solid line in FIG. Therefore, the peak level v1 of the portion of the reproduction signal w corresponding to the repeated mark pattern y is the reproduction signal w corresponding to the isolated mark pattern x.
The peak level is higher than the peak level v2. Therefore, the level difference Δv is generated.

On the other hand, when the recording marks 5 and 6 are recorded, whether the thermal interference between the recording marks 5 and 5 is the same as the thermal interference between the recording marks 6 and 6,
Alternatively, if no thermal interference occurs, the recording marks 6 ... Have the same size as the recording marks 5 ... As shown by the broken line in FIG. Therefore, the peak levels v1 and v2 are equal. Therefore, the level difference Δv
Is zero.

From the above, the intensity of the light beam and the pulse length are set by the repeating / isolated pattern generating means 4 so that the level difference Δv is minimized, thereby recording information under the same thermal interference. Recording conditions can be set. This allows the information to be recorded accurately.

If a CPU (Central Processing Unit) is used, it is possible to measure the change in Δv while changing the recording conditions and automatically perform trial write recording control.

The level difference Δv may occur not only due to thermal interference but also due to optical transfer characteristics (OTF). In this case, the total level difference Δv is expressed by the following equation.

Δv = Δv (OTF) + Δv (thermal) where Δv (OTF) is the level difference due to the optical transfer characteristic, and Δv (thermal) is the level difference due to thermal interference.

If there is Δv (OTF), the level difference Δv
Does not become zero, but when the level difference Δv becomes the minimum, the thermal interference becomes the same as in the above case. That is, according to the trial write recording control device of the present embodiment, Δv
The recording condition for recording information under the same thermal interference can be set regardless of the presence or absence of (OTF). This allows the information to be recorded accurately.

In the above embodiment, the peak levels v1 and v
Although the recording condition is set so that the level difference Δv with respect to 2 becomes the minimum, the level difference (= v2-v3) between the minimum level v3 of the portion of the reproduction signal w corresponding to the repeated mark pattern y and the peak level v2 (= v2-v3). It is also possible to set the recording condition so that it becomes the maximum.

The repeating pattern level detecting means 1 and the isolated pattern level detecting means 2 of the trial writing recording control device are, for example, as shown in FIG. 3, specifically, an envelope detecting means 7 and an envelope detecting means 8. The subtractor 9 can be used as the comparison means 3.

The envelope detecting means 7 and 8 are composed of a peak hold circuit 25 and a sample hold circuit 26, as shown in detail in FIG. 4, for example. The peak hold circuit 25 includes a resistor 27, a diode 28, a capacitor 29 and a buffer 30, and the sample hold circuit 26 includes a switch 31, a capacitor 32 and a buffer 33. The peak levels v1 and v2 obtained by the peak hold circuit 25 can be taken out by controlling ON / OFF of the switch 31 with the timing signal h.

Further, as shown in FIG. 5, the repeating pattern level detecting means 1 and the isolated pattern level detecting means 2 of the trial writing recording control apparatus generate timing signal t for each peak of the reproduction signal w, as shown in FIG. Generating means 1
0 and the reproduction signal w based on the timing signal t.
It is possible to use the A / D converter 11 which extracts the peak levels v1 and v2 of the reproduction signal w by (analog / digital) conversion, and the comparison means 3 uses the peak levels v1 and v2 based on the timing signal t. It is possible to use the processor 12 that calculates and outputs the level difference Δv (= v1-v2) from

The timing generating means 10 is, for example, PL
It can be easily configured with L (phase locked loop) and demodulator.

The second embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

The trial write recording control apparatus of this embodiment is shown in FIG.
As shown in, the averaging means 13 (first level detecting means) for detecting the average level v1 ′ of the portion of the reproduction signal w corresponding to the repeated mark pattern y and the reproduction signal w corresponding to the isolated mark pattern x. Averaging means 14 (second level detecting means) for detecting the average level v2 ′ of the portion,
The level difference Δv ′ (= v from the average levels v1 ′ and v2 ′
Subtractor 15 (comparing means) for obtaining and outputting 1'-v2 ')
It has and.

In the above structure, the recording condition for recording information under the same thermal interference can be set by setting the intensity and the pulse length of the light beam a so that the level difference Δv ′ is minimized. . This allows the information to be recorded accurately.

In the above embodiment, the magneto-optical disk 2 is used.
It is preferable that a recording area dedicated to trial writing is provided in No. 4 separately from the information recording area. If the recording condition is set using the recording area dedicated to the trial writing, there is no fear of destroying the information in the information recording area.

In the above embodiments, the magneto-optical disk 24 is used as the optical recording medium to describe the trial write recording control apparatus and the trial write recording control method of the present invention, but the present invention is not limited to this. The present invention can be widely applied to an optical recording medium or an information recording / reproducing apparatus that records information by using heat generated when the light beam a is irradiated, such as a changeable optical disk and a write-once optical disk.

In the trial write recording control method according to the first aspect of the present invention, the level of the portion of the reproduction signal w corresponding to the repetitive mark pattern y from the magneto-optical disk 24 on which information is recorded by the light beam a, and the isolated mark. The recording condition is set by detecting the level of the portion of the reproduction signal w corresponding to the pattern x and comparing the levels.

According to this, the repeated mark pattern y
The thermal interference between the recording marks 6 and 6 corresponding to and the thermal interference between the recording marks 5 and 5 corresponding to the isolated mark pattern x appear as level fluctuations in the reproduced signal w. Therefore, by detecting the level of the portion of the reproduction signal w corresponding to the repeated mark pattern y and the level of the portion of the reproduction signal w corresponding to the isolated mark pattern x and comparing the levels, the thermal interference can be accurately performed. You can see the difference.
Therefore, the thermal interference between the recording marks corresponding to different mark patterns can be made the same. This allows
It is possible to set accurate recording conditions that are not affected by thermal interference.

The trial write recording control apparatus according to the invention of claim 2 repeats for detecting the level of the portion of the reproduced signal w corresponding to the repeated mark pattern y from the magneto-optical disk 24 on which information is recorded by the light beam a. The comparison result is provided with a pattern level detecting means 1, an isolated pattern level detecting means 2 for detecting the level of a portion of the reproduction signal w corresponding to the isolated mark pattern x, and a comparing means 3 for comparing the levels. The recording condition is set accordingly.

According to this, it is possible to realize the trial writing recording control device adopting the trial writing recording control method of the first aspect.

A trial writing recording control device according to a third aspect of the invention is the trial writing recording control device of the second aspect,
The repetitive pattern level detecting means 1 detects the peak level v of the reproduced signal w corresponding to the repetitive mark pattern y.
1, the isolated pattern level detecting means 2 includes an envelope detecting means 8 for detecting a peak level v2 of a portion of the reproduction signal w corresponding to the isolated mark pattern x, and the comparing means 3 includes a peak level. It is composed of a subtractor 9 that outputs a level difference Δv between v1 and v2, and the recording condition is set so that the level difference Δv is minimized.

According to this, it is possible to realize the trial writing recording control device of the second aspect with a simple configuration.

A trial writing recording control device according to a fourth aspect of the present invention is the trial writing recording control device of the second aspect,
The repetitive pattern level detecting means 1 and the isolated pattern level detecting means 2 perform A / D conversion of the reproduction signal w based on the timing signal 10 and the timing generation means 10 which generates the timing signal t for each peak of the reproduction signal w. , The A / D converter 11 for extracting the peak levels v1 and v2 of the reproduction signal w, and the comparison means 3 is a processor 12 for outputting the level difference Δv between the peak levels v1 and v2, and the level difference Δv is minimized. The recording condition is set so that

According to this, it is possible to realize the trial writing recording control device of the second aspect with a simple configuration.

A trial writing recording control device according to a fifth aspect of the present invention is the trial writing recording control device of the second aspect,
The repetitive pattern level detecting means 1 calculates the average level v of the portion of the reproduction signal w corresponding to the repetitive mark pattern y.
1'is included in the averaging means 13, the isolated pattern level detecting means 2 is included in the averaging means 14 for detecting the average level v2 'of the portion of the reproduction signal w corresponding to the isolated mark pattern x, and the comparing means 3 is included in the comparing means 3. Average level v1 ', v
It is composed of a subtracter 15 that outputs a level difference Δv ′ between 2 ′, and the recording condition is set so that the level difference Δv ′ is minimized.

According to this, it is possible to realize the trial write recording control device of the second aspect with a simple configuration.

[0047]

As described above, in the trial write recording control method according to the invention of claim 1, the level of the reproduction signal portion corresponding to the repetitive mark pattern from the optical recording medium on which information is recorded by the light beam, The recording condition is set by detecting the level of the portion of the reproduction signal corresponding to the isolated mark pattern and comparing the above levels, so that thermal interference between the recording marks corresponding to the repeated mark pattern also occurs in the isolated mark pattern. Thermal interference between corresponding recording marks also appears as level fluctuations in the reproduced signal. Therefore, the level of the reproduced signal corresponding to the repetitive mark pattern and the level of the reproduced signal corresponding to the isolated mark pattern are detected and the levels are compared to accurately determine the difference in thermal interference. You can Therefore, the thermal interference between the recording marks corresponding to different mark patterns can be made the same. As a result, it is possible to set accurate recording conditions that are not affected by thermal interference.

As described above, the trial write recording control apparatus according to the second aspect of the present invention detects the level of the portion of the reproduction signal corresponding to the repetitive mark pattern from the optical recording medium on which information is recorded by the light beam. 1 level detection means, 2nd level detection means for detecting the level of the portion of the reproduction signal corresponding to the isolated mark pattern, and comparison means for comparing the levels are provided, and recording is performed according to the comparison result. Since the conditions are set, there is an effect that it is possible to realize a trial writing recording control device adopting the trial writing recording control method of claim 1.

As described above, the trial-write recording control device according to the invention of claim 3 is the trial-write recording control device of claim 2, wherein the first level detecting means is a reproduction signal corresponding to the repeated mark pattern. The envelope level detecting means for detecting the peak level of the portion of the reproduced signal, the second level detecting means for detecting the peak level of the portion of the reproduction signal corresponding to the isolated mark pattern,
The comparison means is composed of a subtracter for outputting the level difference between the peak levels, and the recording condition is set so that the level difference is minimized. Therefore, the trial write recording control device according to claim 2 can be realized with a simple configuration. Produce an effect.

As described above, the test-write recording control device according to the invention of claim 4 is the test-write recording control device according to claim 2, wherein the first and second level detecting means are the peaks of the reproduction signal. Timing generating means for generating a timing signal for each time, and a reproduction signal based on the timing signal
It is composed of an A / D converter for extracting the peak level of the reproduced signal by conversion, the comparison means is composed of a processor for outputting the level difference between the peak levels, and the recording condition is set so that the level difference is minimized. So
The trial write recording control device according to the second aspect can be realized with a simple configuration.

As described above, the trial write recording control apparatus according to the fifth aspect of the present invention is the test write recording control apparatus according to the second aspect, wherein the first level detecting means is a reproduction signal corresponding to the repetitive mark pattern. The average level of the portion of the reproduced signal corresponding to the isolated mark pattern is detected by the averaging means for detecting the average level of the portion of the reproduced signal. Since the recording condition is set such that the level difference is minimized and the level difference is minimized, the trial write recording control apparatus according to the second aspect can be realized with a simple configuration.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is a schematic configuration diagram showing a trial writing recording control device.

FIG. 2 is an explanatory diagram showing an operation of the trial writing recording control device of FIG.

FIG. 3 is a block diagram showing a specific example of the trial writing recording control device of FIG.

FIG. 4 is a circuit diagram showing details of the trial writing recording control device of FIG.

5 is a block diagram showing another specific example of the trial writing recording control device of FIG. 1. FIG.

FIG. 6 shows a second embodiment of the present invention and is a schematic configuration diagram showing a trial writing recording control device.

FIG. 7 is an explanatory diagram showing an operation of a conventional trial writing recording control device.

[Explanation of symbols]

1 Repetitive pattern level detecting means (first level detecting means) 2 Isolated pattern level detecting means (second level detecting means) 3 Comparing means 4 Repeating / isolated pattern generating means 5 Recording mark 6 Recording mark 7 Envelope detecting means 8 Envelope Detection means 9 Subtractor 10 Timing generation means 11 A / D converter 12 Processor 13 Averaging means (first level detecting means) 14 Averaging means (second level detecting means) 15 Subtractor (comparing means) 24 Magneto-optical Disc (optical recording medium)

Claims (5)

[Claims] 1. A level of a reproduction signal portion corresponding to a repetitive mark pattern and a level of a reproduction signal portion corresponding to an isolated mark pattern are detected from an optical recording medium on which information is recorded by a light beam, and the level is detected. A test writing recording control method characterized in that recording conditions are set by comparison. 2. A first level detecting means for detecting a level of a portion of a reproduction signal corresponding to a repetitive mark pattern from an optical recording medium on which information is recorded by a light beam, and a portion of a reproduction signal corresponding to an isolated mark pattern. The test-write recording control device is provided with a second level detecting means for detecting the level and a comparing means for comparing the levels, and the recording condition is set according to the comparison result. 3. The first level detecting means comprises an envelope detecting means for detecting the peak level of the portion of the reproduction signal corresponding to the repetitive mark pattern, and the second level detecting means comprises the reproduction signal corresponding to the isolated mark pattern. An envelope detecting means for detecting a peak level of a portion, a comparing means for outputting a level difference between the peak levels, and a recording condition are set so that the level difference is minimized. Item 2. A trial writing recording control device according to item 2. 4. The first and second level detecting means include timing generating means for generating a timing signal for each peak of the reproduced signal, and analog / digital conversion of the reproduced signal based on the timing signal to thereby reproduce the reproduced signal. 7. An analog / digital converter for extracting the peak level of the peak level, the comparing means comprising a processor for outputting the level difference between the peak levels, and the recording condition is set so that the level difference is minimized. 2. The trial writing recording control device described in 2. 5. The first level detecting means comprises an averaging means for detecting the average level of the portion of the reproduction signal corresponding to the repetitive mark pattern, and the second level detecting means comprises the averaging means of the reproduction signal corresponding to the isolated mark pattern. The averaging means for detecting the average level of the part, the comparing means for the level difference between the average levels are provided by a subtracter, and the recording condition is set so that the level difference is minimized. Item 2. A trial writing recording control device according to item 2.