JP2697658B2 - Rewritable optical recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable optical recording / reproducing apparatus, and more particularly to a rewritable optical recording / reproducing apparatus such as a magneto-optical disk apparatus for erasing, recording, and reproducing binary digital information. .

[0002]

2. Description of the Related Art In a rewritable optical recording / reproducing apparatus such as a magneto-optical disk apparatus, a laser beam using a semiconductor laser diode or the like as a light source is used as means for erasing, recording, and reproducing information. The light beam is converged on an extremely small light spot and irradiated on the storage medium.

[0003] When erasing information, a laser beam of a predetermined constant intensity is irradiated onto the medium surface. Here, an external magnetic field of the magnetization polarity in the erasing direction is supplied to the medium surface, and the magnetization direction on the medium surface is aligned with the direction of the erasing magnetic field by the temperature rise of the recording film irradiated with the laser beam, and erasing is performed. . On the other hand, at the time of recording information, a laser beam intensity-modulated according to the recording data is irradiated onto the medium surface in the erased state, and an external magnetic field having a polarity opposite to that of the erased magnetic field is applied.
The laser beam produces a local temperature increase effect, whereby a magnetization reversal mark opposite to the erase is formed.

When reproducing information, a laser beam having a constant intensity that does not disturb the recording magnetization is irradiated onto the medium surface, and the change in the polarization plane of the reflected light obtained corresponding to the magnetization reversal mark is detected as an electric signal. After the conversion into binary signals, information reproduction is performed from reproduction timing discrimination using the reproduction clock as a discrimination reference.

In the above-mentioned recording / reproducing process, it is important to keep the error rate at the time of reproducing information as a result as a mission. In particular, at the time of recording, it is required that the recording power intensity of the laser beam (hereinafter, referred to as “recording power”) be adapted to the recording sensitivity characteristics of an actually used medium to perform stable mark formation. Here, under the condition that the recording power is insufficient with respect to the appropriate value in the medium characteristics, the S / N ratio is deteriorated due to the decrease of the reproduction signal level due to the unsaturated recording, and the condition that the recording power is larger than the appropriate value. Below, an increase in the degree of signal interference causes a decrease in resolution and a shift in mark position, and in any case, an increase in the reproduction error rate.

In particular, in recent years, with the demand for higher capacity and higher performance of the apparatus, higher recording density or higher speed has been achieved.
From this requirement, it is desirable that the set margin for the recording power be reduced. As a countermeasure for this, set the loading of the medium or a temperature change exceeding the specified value as the start condition, and execute test recording and reproduction using a test area provided separately from the user use area on the medium. Accordingly, a recording power optimization setting process for adapting the recording power to an actually used medium using a reproduction signal quality such as a reproduction error rate as a criterion has begun to be adopted.

As an example of this optimization setting processing, Japanese Patent Application Laid-Open No. 64-37745 discloses a method of optimizing the recording power so that a reproduction error occurring in test recording / reproduction or a fluctuation of a reproduction signal envelope is minimized. Has been proposed. In this reference, the setting of the erasing power intensity of the laser beam (hereinafter referred to as the erasing power) is not mentioned, but in the conventional practice, a predetermined eigenvalue (fixed value) determined in advance by design conditions or experiments is used. The method used is general.

Japanese Patent Application Laid-Open No. 3-17137 proposes a method of repeating the test recording and reproduction while gradually increasing the recording power and the erasing power, and obtaining the optimum recording / erasing power from the judgment of the reproduction signal quality such as a bit error. Have been. According to this, in particular, in a rewritable optical recording / reproducing apparatus aimed at increasing the capacity / performance, information recording with a low reproduction error rate is realized.

[0009] Here, the test area for optimizing the recording power is not explicitly mentioned in the above references. Therefore, as an example, ISO / IEC100
FIG. 2 shows a case of a 130 [mm] rewritable optical disk cartridge specified by 89 (JIS X 6271). According to this, the manufacturer test area and the protection area are respectively set in the inner peripheral area and the outer peripheral area outside the user use area. The effectiveness of using these areas as the test areas has become clear.

[0010]

However, when the erasing power is set to a predetermined fixed value, the erasing power described in Japanese Patent Application Laid-Open No. 64-37745 is not compatible with the recording power that fluctuates according to environmental conditions. Unexpected errors occur in between. In such a case, under the condition that the erasing power is less than an appropriate value (recording power) in the medium sensitivity characteristic, a signal recorded in the past cannot be completely erased, resulting in residual noise and reproduction due to deterioration of the S / N ratio. There is a disadvantage that the error rate is increased. On the other hand, under the condition that the erasing power is excessive, the deterioration of the characteristics of the medium recording film is accelerated by a moderate temperature rise due to the erasing beam, and the deterioration of the characteristics of the recording film shortens the life of the medium particularly related to the number of times of repeated erasure / recording. There was an inconvenience.

Further, in the apparatus described in Japanese Patent Laid-Open No. Hei 3-17137, the erasing power is gradually increased in the same manner as the recording power. There is an inconvenience that the detection of the lower limit power value that remains to obtain a good determination of the reproduction signal is erroneous. Further, in the case where the recording power optimization and the erasing power optimization are separately performed and executed, it is necessary to execute test recording / erasing twice as much even with a simple calculation.
There is a disadvantage that the optimization process requires a long time.

Further, in this type of apparatus, the test erasing, recording, and reproducing operations are repeatedly performed under the starting conditions such as power-on, medium loading, and a temperature change exceeding a specified value. Is used. In such a case, the number of recording / erasing operations in the same area is much larger than the number of recording / erasing operations in the user area. As a result, the medium characteristics show a tendency to deteriorate with an increase in the number of recording / erasing operations. In addition, since the recording / erasing power is optimally set, there is also a disadvantage that the set power value does not match the medium characteristic of the user area originally intended for optimization.

Here, even if the erasing power is optimized in the above processing, the information on the medium is always recorded in the same apparatus as long as this type of apparatus is characterized by the interchangeability of the medium. Is not guaranteed. In some cases, it is sufficiently assumed that past information to be erased is recorded with an excessive recording power or recorded with a track position shift. In this case, with the erasing power optimized under the conditions of the device, the erasing is incomplete and the noise is left unerased.

[0014]

An object of the present invention is to provide a rewritable optical recording / reproducing apparatus capable of improving the disadvantages of the prior art, in particular, minimizing the deterioration of the medium and performing effective optimization at high speed. That is its purpose.

[0015]

According to the first aspect of the present invention,
Recording / reproducing means for performing recording on a recording area on a disk-shaped optical recording medium and test recording on a test area, and performing a reproduction test on the test area after the test recording, and determining the quality of a reproduced signal in recording / reproduction. A reproduction quality determination means, and a main control section for determining the optimum recording power based on the result of the quality determination of the reproduction signal by the reproduction quality determination means and controlling the driving of the recording / reproduction means. Further, the main control unit includes a standard recording power, a standard erasing power, and an upper limit erasing power for driving the recording / reproducing means.
And a memory circuit that stores the information
The main control unit controls the optimum recording power determined by the main control unit.
And a standard recording power stored in the memory circuit, and an optimum correction rate calculating function for calculating an optimum correction rate. The standard erasing power is corrected by the calculated optimum correction rate and the optimum erasing power is calculated. And an erasing power setting control function.

According to the second aspect of the present invention, the erasing power setting control function of the main controller switches and sets the optimum erasing power information and the upper limit erasing power information, and controls a predetermined information recording process based on the information. It is configured to execute.

According to the third aspect of the present invention, the main control section executes an erasing operation with an optimum erasing power in a normal information recording process, and performs upper limit erasing when a predetermined recording error is detected in verification / reproduction after recording. An erasing power switching setting function for executing an erasing operation by power is provided.

According to a fourth aspect of the present invention, recording is performed on a recording area on a disk-shaped optical recording medium, test recording is performed on an inner and outer peripheral test area provided in the inner and outer peripheral areas, and an inner and outer peripheral test after the test recording is performed. Recording / reproducing means for performing a reproduction test on an area, reproduction quality judging means for judging the quality of a reproduced signal in recording / reproducing, and optimum inner / outer-peripheral recording power based on the quality judgment result of the reproduced signal by the reproduction quality judging means. And a main controller for controlling the recording and reproducing means.

Further, the main controller is provided with a memory circuit for storing information relating to the inner and outer peripheral standard recording power for driving the recording / reproducing means, the inner and outer peripheral standard erasing power, and the inner and outer peripheral upper limit erasing power. .

The main controller calculates an inner / outer circumference optimization correction rate from the ratio between the inner / outer circumference optimum recording power determined by the main controller and the inner / outer circumference standard recording power stored in the memory circuit. An inner / outer circumference optimum correction rate calculating function, and an arbitrary track optimization correction rate in an arbitrary track given in the radial direction of the optical recording medium, and a radial position of the inner / outer circumference test area based on the inner / outer circumference optimization correction rate. Arbitrary track optimization correction rate calculation function that is determined by interpolation calculation with the radius position of an arbitrary track, and a predetermined standard erase power given to an arbitrary track is corrected by an arbitrary track optimization correction rate, and this is corrected to the optimal erase power of an arbitrary track And an arbitrary track erase power setting control function.

According to the fifth aspect of the present invention, the reproduction quality determining means detects the reproduction error rate and determines whether or not the detected reproduction error rate is within a predetermined value. The determination is made. With these, the above-mentioned object is to be achieved.

[0022]

According to the first aspect of the invention, when the test recording / reproducing execution stage is reached, the main control unit controls the recording / reproducing means,
The optical head is positioned in the test area, the test data is recorded, and the recorded test data is read. The read test data (reproduction signal)
Is judged by the reproduction quality judgment means. The main controller obtains the result of the quality judgment and determines the optimum recording power. Also, the main control unit uses the standard recording power from the memory circuit,
Read the standard erase power and upper limit erase power. And
The main control unit calculates an optimization correction rate from the ratio between the optimum recording power and the standard recording power, corrects the standard erasing power with the calculated optimization correction rate, and sets the result as the optimum erasing power.

According to the second aspect of the present invention, the optimum erasing power and the upper limit erasing power are switched as required, and a predetermined information recording process is controlled using the selected erasing power.

According to the third aspect of the present invention, the erasing operation with the optimum erasing power is performed in the normal information recording process, and the erasing operation with the upper limit erasing power is performed when a predetermined recording error is detected in the verification / reproduction after recording. Be executed.

According to the fourth aspect of the invention, the optimum recording power is calculated in both the inner and outer test areas (the inner and outer optimum recording power), and the inner and outer standard recording power stored in the memory circuit is calculated. An inner / outer circumference optimization correction rate is calculated from the ratio with the power. Next, the arbitrary track optimization correction rate for the arbitrary track is determined based on the inner and outer circumference optimization correction rate and by performing an interpolation calculation between the radial position of the inner and outer circumference test area and the radial position of the arbitrary track.
Then, a predetermined standard erase power given in advance for each arbitrary track is corrected by an arbitrary track optimization correction rate, and the result is set as the optimum erase power for the arbitrary track.

According to the fifth aspect of the present invention, in determining the quality of a reproduced signal, for example, a reproduction error rate is detected by comparing a signal before recording with a signal after reproduction, and the detected reproduction error rate is determined in advance. By judging whether or not the quality is within a predetermined value, the quality of the reproduction signal is uniformly judged.

[0027]

An embodiment of the present invention will be described below with reference to FIG.

The optical recording / reproducing apparatus shown in FIG. 1 performs recording on a recording area on a disk-shaped optical recording medium 6, performs test recording on a test area, and performs a reproduction test on the test area after the test recording. Reproduction means 2
0, a reproduction quality judging means 10 for judging the quality of the reproduction signal f in the recording / reproduction, and an optimum recording power is determined based on the result of the quality judgment of the reproduction signal by the reproduction quality judging means 10. And a main control unit 11 for controlling the driving of the main unit. Further, the main control unit 11 is provided with a memory circuit 13 for storing information relating to standard recording power, standard erasing power, and upper erasing power for driving the recording / reproducing means 20. Optimal recording power and memory circuit 13 determined by main controller 11
Function for calculating an optimum correction rate from the ratio with the standard recording power stored in the memory, and erasing the standard erasing power with the calculated optimum correction rate to obtain the optimum erasing power. It has a power setting control function.

Hereinafter, the above configuration will be described in more detail. The erasing power setting control function of the main control unit 11 switches and sets the optimum erasing power information and the upper limit erasing power information, and
Based on this, a predetermined information recording process is controlled. In addition to the above, the main control unit 11 executes an erasing operation with the optimum erasing power in a normal information recording process,
An erasing power switching setting function for executing an erasing operation using an upper erasing power when a predetermined recording error is detected in verification / reproduction after recording.

The reproduction quality judging means has a function of detecting the reproduction error rate and judging the quality of the reproduction signal based on whether or not the detected reproduction error rate is within a predetermined value. .

The recording / reproducing means 20 includes a recording pulse correction circuit 1 for correcting the read data signal a, a recording drive circuit 2 for converting the read data signal a corrected by the recording pulse correction circuit 1 to a recording current b, This recording drive circuit 2
An optical head 4 that writes information on the medium 6 based on the recording current converted by the optical head 4, an erasing drive circuit 3 that drives an erasing operation of the optical head 4 in response to a command from the main control unit 11, and an optical head 4
Amplifying circuit 7 for amplifying reproduced analog signal d read by
A reproduction pulse conversion circuit 8 for converting the amplified reproduction analog signal d into a reproduction data pulse e; and a reproduction data discrimination circuit 9 for detecting the read data signal f using the reproduction clock signal as a discrimination reference. In addition, a track control circuit 12 for controlling the positioning of the optical head 4 in response to a command from the main controller 11, an electromagnet 15 for generating a magnetic field in a predetermined direction on the medium 6, and a magnetic field drive for generating a magnetic field in the electromagnet 15 And a circuit 14.

The optical head 4 contains a laser diode 4A and a photodetector 4B inside, and a medium 6
On the upper side, a magnetization reversal mark 601 is formed. Reference numeral 5 denotes a spindle motor that drives the medium 6 to rotate.

Next, the overall operation of this embodiment will be described.

First, the recording / reproducing operation for normal user information will be described.

In writing information, a write data signal a
Is input to the recording pulse correction circuit 1, the write signal a forms a stable magnetization reversal mark 601 on the medium 6 based on the medium recording sensitivity characteristic or the linear velocity condition of the track position (medium radius position) to be recorded. Correction to the recording pulse width optimized for formation is performed.

Thereafter, in the recording drive circuit 2, the write data signal a is converted into a recording current b corresponding to the light intensity at the time of recording which is also optimized based on the medium recording sensitivity and the linear velocity condition, and the optical head 4 The current of the laser diode 4A is driven. The laser diode 4A irradiates light having an intensity proportional to the supplied recording current b, and its light output is condensed by an optical lens provided in the optical head 4 and is recorded on a medium 6 rotated and driven by a spindle motor 5. Is irradiated. At this time, the main controller 11 controls the magnetic field drive circuit 14 to generate a magnetic field in the recording magnetization direction from the electromagnet 15 arranged on the medium 6. As a result, a local temperature rise is caused on the medium 6 with the above-described irradiation of the light output, and the magnetization reversal mark 60 is formed on the medium 6 as a magnetization change from the erasing magnetization direction.
1 is formed, and the recording of information is completed.

Here, prior to the above-described information recording operation, an erasing operation for aligning the magnetization direction on the medium surface with a predetermined erasing direction is performed. In this erasing operation, an optimized constant erasing current c is input to the laser diode 4A in the optical head 4 so that the previously recorded information can be surely erased from the erasing drive circuit 3, and this is generated. The light output is irradiated onto the medium 6 in the same manner as in the recording operation. Here, the magnetic field drive circuit 14 switches the magnetic field generated from the electromagnet 15 to the erasing magnetization direction opposite to that at the time of recording according to a command from the main control unit 11, so that a continuous temperature rise occurs on the medium 6, As a result, all the magnetization directions are arranged in the erase direction.

In reproducing the information, first, a current for generating a predetermined constant intensity light output set so as not to disturb the information on the medium by the erase driving circuit 3 is input to the laser diode 4A. Accordingly, a change in the polarization plane corresponding to the magnetization reversal mark 601 is detected from the reflected light of the output light on the medium surface by using the Kerr effect, and is converted into an electric signal by the optical detector 4B. The reproduced analog signal d output from the optical detector 4B is amplified by the amplifier circuit 7 and then input to the reproduction pulse generating circuit 8, where the signal is subjected to signal waveform processing and the reproduced data pulse e is formed of a binary digital signal. Is converted to The reproduction data discrimination circuit 9 which has received the reproduction data pulse e generates a reproduction clock signal that is phase-synchronized with the reproduction data pulse e, and performs reproduction timing discrimination based on the reproduction clock signal as a discrimination reference, thereby converting the read data signal f. To detect. Thereby, information is reproduced.

On the other hand, in this embodiment, the discrimination margin in the data discrimination circuit 9 is reduced in order to increase the recording density and speed up the recording / reproducing processing. In this case, particularly, the laser beam intensity (recording / erasing power) at the time of recording / erasing can greatly affect the recording / erasing of good data. Therefore, test recording / reproducing is executed in a test area outside the user data area, and recording / erasing is performed. A function is provided for performing a recording / erasing power optimization setting process for adapting the erasing power to the sensitivity characteristics of the actually used medium. This function is realized by the main control unit 11 sequentially executing programs provided in advance.

When the test start signal i is input to the main control unit 11 under the start conditions such as power-on of the apparatus, medium loading, temperature change exceeding a specified value, or recording / reproducing error, the main control unit 1
1 drives the track control circuit 12 to set the light beam position of the light beam 4 of the optical head 4 to the designated track position in the test area, and also outputs the standard recording power, the standard erasing power, and the upper limit erasing from the memory circuit 13. Read power.

Here, the standard recording power and the standard erasing power are determined by design conditions, a standard initial fixed value determined from experimental results, or the immediately preceding recording / erasing power optimization processing. The optimized set value is used. In the combination of the medium and the device, the initial fixed value is used when there is no record of the optimization setting of the recording / erasing power in the past. The value is selected. In such a case, as the upper limit erasing power, an upper limit erasing power value that can achieve reliable erasing in consideration of various variation tolerances from design conditions is used.

Next, the main controller 11 instructs the erase drive circuit 3 to output an erase current c corresponding to the above-described standard erase power or upper limit erase power. As a result, the test track is erased in the same procedure as the erase operation for the normal information described above. Thereafter, an initial lower limit recording power is determined by subtracting a predetermined margin power from the standard recording power. A recording current b corresponding to the initial power is output to the recording drive circuit 2 and the test data g is transmitted to the recording pulse correction circuit 1. The test recording is performed on the test track by the same operation as the normal information recording.

The test data recorded on the test track at the initial lower limit recording power is read out in the same procedure as in the normal information reproduction, and the binary read data signal f is read.
Is input to the reproduction error rate determination circuit 10.

On the other hand, the test data g itself used for the test recording is also supplied to the reproduction error rate determination circuit 10. Then, the reproduction error rate determination circuit 10 compares the two and detects the reproduction error rate.
Then, it is determined whether or not the reproduction error rate is within a preset specified value, and an error rate determination signal h is generated. The error rate determination signal h is transmitted to the main control unit 11 as a reproduction error rate determination result. Will be reported.

The main control section 11 decreases the lower limit recording power when the result of determination of the reproduction error rate at the initial lower limit recording power is good, and increases the lower limit recording power when the result is not good. Then, the same test erase / recording / reproducing operation as described above is repeatedly performed using the changed powers, and the minimum lower limit recording power at which the reproduction error rate determination result is recognized as good, that is, the optimum lower limit recording power is detected. I do. Thereafter, the main control unit 11 determines the optimum recording power by adding the value of the predetermined reduction margin power to the value of the above-described optimum lower limit recording power.

Further, the main control unit 11 obtains an optimization correction rate from the result obtained by dividing the optimum recording power determined in the above processing by the standard recording power, and multiplies the standard erasing power by the optimization correction rate to obtain the optimum erasing power. Make a power decision. After that, the optimum recording power and the optimum erasing power are stored in the memory circuit 13 as the standard recording power and the standard erasing power, and the updating process is executed, and a series of the recording / erasing power optimizing process ends.

From the above processing operations, the optimum recording power and the optimum erasing power are determined. In the subsequent recording process of the user information on the medium, recording / writing under both power conditions is basically performed.
Erase is performed. Among them, in particular, for the erasing power, switching between the optimum erasing power and the upper limit erasing power is used.

In this type of apparatus, there is a great feature that the medium can be exchanged, and there is no guarantee that the past recording processing on the medium has been executed by the same apparatus. Alternatively, it is sufficiently assumed that the apparatus does not have a recording power optimization setting function or the like. In addition, the difference between the apparatuses is caused not only by the difference in the recording power condition but also by the servo condition such as the track center shift (off-track) and the defocus (defocus) of the light beam. Although the optimum conditions can be obtained for the recording power by the above-described optimization setting processing, the set optimum erasing power for the erasing power does not necessarily guarantee reliable erasing in all cases.

Here, if a more reliable erasure is expected, the remaining erasure problem can be solved by using the upper limit erasing power set in consideration of the inter-device variation.
On the other hand, excessive erasing power accelerates the deterioration of the characteristics of the medium recording film. Therefore, it is not desirable to always perform the erasing operation using this upper erasing power from the viewpoint of the life of the medium.

In this embodiment, in consideration of this point, the verification reproduction is performed for the purpose of verification after the recording of the user information, and a case where a high error rate is detected from the result is set as a start condition. By using the upper limit erasing power only at the time of executing the subsequent recording process and switching to erasing with the optimum erasing power usually, reliable erasing can be achieved without deteriorating the medium characteristics.

As described above, according to this embodiment, the standard erasing power is corrected by the optimization correction rate determined from the ratio between the optimum recording power at the time of executing the recording power optimizing process and the predetermined standard recording power. Since the optimum erasing power is obtained, test recording / reproduction related to erasing power optimization is not required.
The optimization setting of the erasing power is achieved, the deterioration of the medium characteristics due to the multiple erasures in the test area can be minimized, and the processing time related to the optimization of the recording / erasing power can be shortened.

Also, the optimum erasing power is usually used as the erasing power in the recording process of the user information, and a predetermined upper limit erasing power is switched and used when retrying due to an error or the like, so that an excessive erasing beam in the user area is used. It is possible to prevent deterioration of the medium characteristics, suppress occurrence of unerased noise due to inter-device variations such as track position deviation, and achieve stable information recording with a low reproduction error rate.

Further, since the quality of the reproduced signal is determined based on whether or not the reproduction error rate is within a predetermined value, the quality can be uniformly determined, thereby realizing high-speed processing.

Here, in the above embodiment, the process of optimizing the recording / erasing power in a single test area is described. However, the number of test areas is not particularly limited. In an apparatus for rotating a disk-shaped medium at a constant rotation speed, a difference in recording sensitivity occurs at a radial position of the medium. Therefore, a plurality of test areas are provided in the radial direction, and a recording / erasing power optimization setting process is individually performed. It may be something. In particular, as shown in FIG. 2, when the test area is provided in the innermost and outermost areas outside the user use area, the optimum recording power and the optimum erasing power in both test areas are used to determine each medium radial position. It can be said that the method of determining the optimum value of by the interpolation calculation is effective because of simplification of processing and reduction of processing time.

Another embodiment using a method of obtaining the optimum value of the recording / erasing power at an arbitrary medium radius position by the interpolation calculation will be described below.

The optical recording / reproducing apparatus of this embodiment performs recording on a recording area on a disk-shaped optical recording medium and test recording on an inner / outer peripheral test area provided in the inner / outer peripheral area. Recording / reproducing means for performing a reproduction test on the peripheral test area, reproduction quality judging means for judging the quality of the reproduced signal in recording / reproducing, and inner / outer peripheral optimum recording power based on the quality judgment result of the reproduced signal by the reproduction quality judging means. And a main controller for driving and controlling the recording / reproducing means.

Further, the main control unit is provided with a memory circuit for storing information on the inner and outer peripheral standard recording power for driving the recording / reproducing means, the inner and outer peripheral standard erasing power, and the inner and outer peripheral upper limit erasing power. .

The main controller calculates an inner / outer circumference optimization correction rate from the ratio of the inner / outer circumference optimum recording power determined by the main controller to the inner / outer circumference standard recording power stored in the memory circuit. An inner / outer circumference optimum correction rate calculating function, and an arbitrary track optimization correction rate in an arbitrary track given in the radial direction of the optical recording medium, and a radial position of the inner / outer circumference test area based on the inner / outer circumference optimization correction rate. Arbitrary track optimization correction rate calculation function that is determined by interpolation calculation with the radius position of an arbitrary track, and a predetermined standard erase power given to an arbitrary track is corrected by an arbitrary track optimization correction rate, and this is corrected to the optimal erase power of an arbitrary track And an arbitrary track erasing power setting control function.

Basic data recording and reproducing operations are the same as those in the first embodiment. The procedure for obtaining the optimum recording power, the optimum correction rate (optimal recording power / standard recording power), and the optimum erasing power is the same as in the above-described embodiment. Among them, the optimum recording power is required for both the inner and outer test tracks.

Hereinafter, a method for obtaining the optimum value of the recording / erasing power at an arbitrary medium radius position by interpolation calculation will be described in detail.

Now, the radial positions of the inner and outer test tracks are R _IN and R _OUT , respectively, and the optimum recording power there is P R.
_{When IN} and P _{OUT are set} and the radius position on an arbitrary track is r, the optimum recording power P _W at the r position is P _W = P _IN + (P _OUT −P _IN ) · [(r−R _IN ) / (R
_OUT- R _IN )]. The test track radius position is stored in the memory circuit in advance.

If the optimized correction rates (optimal recording power / standard recording power) at the inner circumference and the outer circumference are respectively α _IN and α _OUT , the optimized correction rate α at the radial position r is α = α _IN + (Α _OUT −α _IN ) × (r−R _IN ) / (R _OUT
−R _IN ), and the optimum erasing power Pe at the radial position r is Pe = Pr × α, where Pr is the standard erasing power at r.

Using the optimum erasing power thus obtained, an erasing operation on an arbitrary track is performed.

The above-described interpolation calculation shows linear interpolation as an example, but is not particularly limited, and uses an approximation calculation formula obtained by characteristic approximation from an experimental evaluation on an actual device or the like. It may be.

Here, in each of the above embodiments, when the recording power is optimized, the judgment is made that the reproduction error rate in the reproduction error rate judgment circuit 10 is within a specified value. There is no particular limitation as long as it is a means for judging the quality.
Alternatively, it is possible to determine the reproduction resolution (reproduced signal amplitude ratio between the highest recording density and the lowest recording density) within a specified range or the like. The object is achieved by providing a reproduction signal amplitude judgment circuit in place of the reproduction error rate judgment circuit 10 when the reproduction signal amplitude is the judgment reference, and a reproduction resolution judgment circuit when the resolution is the judgment reference.

Further, the recording method on the medium may be mark position recording using the center position of the magnetization reversal mark as an information point, or mark edge recording using the edge position of the magnetization reversal mark as an information point. It is not particularly limited.

As described above, according to this embodiment, the same advantageous effects as those of the above-described first embodiment are obtained, and a test area is provided in the innermost peripheral area and the outermost peripheral area outside the user use area. From the optimum recording power and optimum erasing power in both test areas, the optimum value at each medium radius position is determined by interpolation calculation, so that the optimum recording power and optimum erasing power corresponding to the different recording sensitivities depending on the medium radius position are obtained. Optimum recording and reproduction can be performed.

Here, in each of the above embodiments, when the recording power is optimized, the judgment is made that the reproduction error rate in the reproduction error rate judgment circuit 10 is within a specified value. There is no particular limitation as long as it is a means for judging the quality.
Alternatively, it is possible to determine the reproduction resolution (reproduced signal amplitude ratio between the highest recording density and the lowest recording density) within a specified range or the like. The object is achieved by providing a reproduction signal amplitude judgment circuit in place of the reproduction error rate judgment circuit 10 when the reproduction signal amplitude is the judgment reference, and a reproduction resolution judgment circuit when the resolution is the judgment reference.

[0069]

Since the present invention is constructed and functions as described above, according to this, the optimization correction rate determined from the ratio between the optimum recording power at the time of executing the recording power optimizing process and the predetermined standard recording power is determined. Since the optimum erase power is obtained by correcting the standard erase power, the optimization setting of the erase power can be achieved without performing the test recording / reproduction related to the optimization of the erase power. The accompanying deterioration of the medium characteristics can be minimized, and the processing time for optimizing the recording / erasing power can be shortened.

According to the second aspect of the present invention, the erasing power in the recording process of the user information is switched to the optimum erasing power or the upper erasing power as necessary, so that the medium characteristic due to the excessive erasing beam in the user area is used. Deterioration is suppressed, and unerased noise due to device-to-device variation such as track position deviation is suppressed, and stable information recording with a low reproduction error rate can be achieved.

According to the third aspect of the present invention, the optimum erasing power is usually used as the erasing power in the recording process of the user information, and a predetermined upper limit erasing power is switched and used at the time of retrying due to an error, etc. Media characteristics degradation due to excessive erasing beams can be more effectively suppressed, and the occurrence of unerased noise due to device-to-device variations such as track position deviation can be suppressed, and stable information recording with a low reproduction error rate can be achieved. be able to.

According to the fourth aspect of the present invention, a test area is provided in the innermost area and the outermost area outside the user use area,
From the optimum recording power and the optimum erasing power in both test areas, the optimum value at each medium radius position is determined by interpolation calculation.Therefore, with the optimum recording power and the optimum erasing power corresponding to different recording sensitivities depending on the medium radius position, Good recording and reproduction can be performed.

According to the fifth aspect of the present invention, the quality of the reproduced signal is determined based on whether or not the reproduction error rate is within a predetermined value. Therefore, the quality can be uniformly determined.
It is possible to provide an excellent rewritable optical recording / reproducing apparatus, which can realize high-speed processing, which is unprecedented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a format configuration example of a medium relating to a test area.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording pulse correction circuit 2 Recording drive circuit 3 Erase drive circuit 4 Optical head 5 Spindle motor 6 Medium 7 Amplification circuit 8 Reproduction pulsing circuit 9 Reproduction data discrimination circuit 10 Reproduction error rate judgment circuit (reproduction quality judgment means) 11 Main control unit 12 Track control circuit 13 Memory circuit 14 Magnetic field drive circuit 15 Electromagnet 301 Laser diode 302 Optical detector 401 Magnetization reversal mark a Write data signal b Recording current c Erase current d Reproduction analog signal e Reproduction data pulse f Read data signal (reproduction signal) g Test data h Error rate judgment signal i Test start signal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 20/18 552 G11B 20/18 552B 572 572D 572F

Claims (5)

(57) [Claims] A recording / reproducing means for performing recording on a recording area on a disk-shaped optical recording medium and test recording on a test area, and performing a reproduction test on the test area after the test recording; A reproduction quality judgment unit for judging the quality of the signal; and a main control unit for deciding the optimum recording power based on the quality judgment result of the reproduction signal by the reproduction quality judgment unit and controlling the driving of the recording / reproduction unit. In the rewritable optical recording / reproducing apparatus, the main control unit is provided with a memory circuit for storing information on standard recording power, standard erasing power, and upper limit erasing power for driving the recording / reproducing means. The main control unit determines whether the ratio between the optimum recording power determined by the main control unit and the standard recording power stored in the memory circuit is satisfied. An optimum correction rate calculating function for calculating an optimization correction rate, and an erasing power setting control function for correcting the standard erasing power with the calculated optimizing correction rate and using the corrected power as an optimum erasing power. Rewritable optical recording / reproducing apparatus. 2. The erasing power setting control function of the main controller switches and sets the optimum erasing power information and the upper limit erasing power information, and performs a predetermined information recording process control based on the switching power information. Claim 1 characterized by the following:
A rewritable optical recording / reproducing apparatus as described in the above. 3. The main control unit executes an erasing operation using the optimum erasing power in a normal information recording process, and performs an erasing operation using the upper limit erasing power when a predetermined recording error is detected in verification / reproduction after recording. 3. The rewritable optical recording / reproducing apparatus according to claim 2, further comprising an erasing power switching setting function for executing an operation. 4. Performing recording on a recording area on a disk-shaped optical recording medium and test recording on an inner and outer peripheral test area provided in the inner and outer peripheral areas, and performing a reproduction test on the inner and outer peripheral test area after the test recording. Recording / reproducing means for performing recording, reproducing quality determining means for determining the quality of a reproduced signal in the recording / reproducing, and determining the inner / outer peripheral optimum recording power based on the result of the quality determination of the reproduced signal by the reproducing quality determining means. A rewritable optical recording / reproducing apparatus comprising: a main control unit for controlling the driving of the recording / reproducing means; wherein the main control unit includes an inner / outer peripheral standard recording power, an inner / outer peripheral standard erasing power for driving the recording / reproducing means, and A memory circuit storing information related to the inner / outer periphery upper limit erasing power is provided in parallel, and the main controller is configured to optimize the inner / outer periphery determined by the main controller. Recording power and inner and outer standard recording power stored in the memory circuit
An inner / outer circumference optimum correction rate calculation function for calculating an inner / outer circumference optimization correction rate from the ratio of the inner and outer circumference optimization correction rates for an arbitrary track given in a radial direction of the optical recording medium. An arbitrary track optimization correction rate calculating function based on a correction rate and determined by interpolation between a radial position of the inner and outer peripheral test areas and a radial position of the arbitrary track; and a predetermined standard erase power given to the arbitrary track. A rewritable optical recording / reproducing apparatus, comprising: an arbitrary track erasing power setting control function for correcting with an arbitrary track optimizing correction rate and using the correction factor as an optimum erasing power for an arbitrary track. 5. The reproduction quality judgment means detects a reproduction error rate and judges the quality of a reproduction signal based on whether or not the detected reproduction error rate is within a predetermined value. The rewritable optical recording / reproducing apparatus according to claim 1, 2, 3, or 4, wherein