JP2000195054A - Optical information-recording/reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more correctly obtain an optimum recording power for recording data by trial writing with use of a data area, and reduce deterioration of the data area by lessening an amount of the trial writing to the data area. SOLUTION: A CPU 10 executes trial writing and records a test signal with changing a recording laser power stepwise to a trial write area on an optical disk 2, detects a reproduction state of the trial written and recorded test signal, and obtains a reference value of an optimum recording power. The test signal is trial written and recorded to a data area on the optical disk 2 while the recording laser power is changed stepwise centering the reference value of the optimum recording power. The reproduction state of the trial written and recorded test signal is detected, whereby the optimum recording power is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus such as an optical disk apparatus for optically recording and reproducing information on a recording medium such as an optical disk.

[0002]

2. Description of the Related Art An optical disk drive for optically recording and reproducing information on and from an optical disk is characterized by the characteristics of the optical disk and the laser diode (LD) of the optical disk drive when recording on an optical disk on which information can be optically recorded. It is necessary to correct factors such as the characteristics of light emission and changes in emission power, and to record information under optimal conditions.

Therefore, using a power calibration area (PCA area), which is a test writing area on the innermost circumference of the optical disc, the power of the LD is changed stepwise to perform power calibration of information (test writing). And
Thereafter, the information is reproduced from the PCA area, the optimum recording condition, that is, the optimum recording power is obtained from the state of the reproduction signal, and thereafter, the information is recorded in the data area of the optical disk based on the obtained optimum recording power.

However, since the PCA area is located on the inner circumference of the optical disc, the radius position differs from the data area where data is actually written. If the radial position is different, a change in LD characteristics, optical components, medium characteristics of the optical disk, and the like due to a temperature change in the optical disk drive, and a change in power of laser light from the LD on the disk surface due to tilt of the optical disk occur. Therefore, it is difficult to obtain an accurate optimum recording power only in the PCA area.

Therefore, conventionally, in order to determine the optimum recording power without depending on the radial position of the optical disc on which information can be recorded and reproduced, test recording by power calibration is performed at a writing position of a data area for recording data.
There has been proposed an optical information recording / reproducing apparatus (see, for example, Japanese Patent Application Laid-Open No. 6-44563) which determines the optimum recording power based on the test recording result and then erases the data in the test recording area.

[0006]

However, in the optical information recording / reproducing apparatus as described above, the number of times of rewriting on a rewritable recording medium is limited, so that test recording is performed in an area where data is actually recorded. Thus, there is a problem that the number of rewrites for the area is reduced. Also, by writing data,
Since the recording characteristics of the recording area may be degraded, it is desirable not to write data other than data to the data area as much as possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and more precisely determines the optimum recording power at the time of data recording by trial writing using a data area, and reduces the trial writing amount for the data area. It is intended to reduce the deterioration of the data area.

[0008]

According to the present invention, there is provided an optical information recording / reproducing apparatus for recording / reproducing information optically on / from a recording medium. A test writing means for determining a test value by test-recording a test signal by changing a recording laser power stepwise in an area, and a reference of an optimum recording power by detecting a reproduction state of the test signal recorded by the test writing by the means. An optimum recording power reference value determining means for obtaining a value; and a test signal in which a recording laser power is changed stepwise around a reference value of the optimum recording power in a data area where data is written on the recording medium. Trial writing means for determining the optimum recording power for writing and recording, and detecting the reproduction state of the test signal test-recorded and recorded by the means to determine the optimum recording power. It is provided with a optimal recording power determination means that.

In an optical information recording / reproducing apparatus for optically recording and reproducing information on and from a recording medium,
Reference value determination test writing means for test writing a test signal by stepwise changing the recording laser power in a test writing area on the recording medium, and detecting a reproduction state of the test signal recorded by the test writing by the means. An optimum recording power reference value determining means for determining a reference value of the optimum recording power, and an optimum recording power reference value determining means determined based on a linear velocity for a data area where data is to be written on the recording medium. An optimum recording power reference value changing means for changing the reference value of the recording power; and a data area for writing data on the recording medium centered on the optimum recording power reference value changed by the optimum recording power reference value changing means. Test writing means for determining the optimum recording power for test writing a test signal by changing the recording laser power step by step It may be provided with the optimum recording power determination means for determining an optimum recording power by detecting the playback state of trial writing recorded test signal by the unit.

Further, in the optical information recording / reproducing apparatus as described above, the optimum write power determining test writing means sets a test write recording position for the data area to a different position every time test write recording is performed. It is preferable to provide a writing and recording position setting means.

In the optical information recording / reproducing apparatus as described above, after trial writing and recording on the data area,
It is preferable to provide a test write recording data erasing means for erasing data in the test write recorded area.

Further, in the optical information recording / reproducing apparatus as described above, the radial distance between the area where the test signal is trial-written and recorded by the optimal recording power determining test-writing means and the area where data is written is constant. It is preferable to provide a means for recalculating the optimum recording power when the value exceeds the value.

According to a first aspect of the present invention, there is provided an optical information recording / reproducing apparatus for determining a reference value of an optimum recording power by trial writing in a test writing area, and determining a recording power in trial writing in a data area based on the reference value. The optimum recording power for the data recording position can be obtained more accurately, and the deterioration of the data area and the decrease in the number of rewrites can be suppressed. Can be.

According to a second aspect of the present invention, there is provided an optical information recording / reproducing apparatus for obtaining a reference value of an optimum recording power by trial writing in a trial writing area, and correcting and changing the reference value based on a linear velocity in the data area. Then, based on the changed reference value, the range for changing the recording power at the time of test writing to the data area is narrowed down in a shorter time, and the optimum recording power is obtained with a smaller number of test writings.
The optimum recording power for the data recording position can be obtained more accurately and in a short time, and the deterioration of the data area and the decrease in the number of rewrites can be suppressed.

In the optical information recording / reproducing apparatus according to the third aspect of the present invention, the test writing is performed at a different position each time the test writing is performed on the data area. Therefore, only the same area in the data area is significantly more remarkable than the other areas. Deterioration can be prevented.

In the optical information recording / reproducing apparatus according to the fourth aspect of the present invention, the test signal written to the data area by test writing is erased, so that the deterioration of the writing characteristics of the test written area can be minimized. it can.

In the optical information recording / reproducing apparatus according to the fifth aspect of the present invention, when the data recording position of the recording medium and the recording position when the optimum recording power is obtained are largely separated, the optimum recording power is calculated again. Thus, data can always be written with an accurate optimum recording power.

[0018]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an optical disk drive which is an embodiment of the optical information recording / reproducing apparatus of the present invention.

The optical disk drive 1 has a CPU, R
An optical disk 2 as a recording medium such as a CD-RW disk is connected to a host machine 3 such as a personal computer realized by a microcomputer including an OM and a RAM based on an instruction from the host machine 3.
This is a device for recording and reproducing optical information with respect to.

The optical disk drive 1 is realized by a microcomputer, and includes a CPU 10, a memory 1
1, encoder / decoder 12, signal processing unit 13, servo control unit 14, pickup (PU) unit 15, disk drive unit 16, host interface (I / F) 1
7 are connected via a bus 18 so that data can be exchanged with each other.

The CPU 10 controls the optical disk drive 1
By executing the firmware program on the memory 11, the encoder / decoder 12, signal processing unit 13, servo control unit 14, PU
Unit 15, disk drive unit 16, and host I / F
In addition to controlling each block such as 17, an optimum recording power determination process for data recording according to the present invention is performed.

The memory 11 is a readable and writable storage means such as a RAM. The memory 11 stores a firmware program, provides a work area for the CPU 10 to execute various processes, and transmits and receives data to and from the host machine 3. It is used for

The encoder / decoder 12 decodes the digital signal input from the signal processing unit 13 at the time of data reproduction and sends it to the CPU 10 or the memory 11 as user data. At the time of data recording, the host I / F 1
The user data transmitted from the bus 7 via the bus 18 is encoded into a data array for recording on the optical disc 2,
A process for sending to the signal processing unit 13 is performed.

At the time of data reproduction, the signal processing unit 13
Detecting a signal from the unit 15, the PU unit 15
And the data for controlling the disk drive unit 16 are notified to the servo control unit 14, and the data read from the optical disk 2 is transmitted to the decoder of the encoder / decoder 12.

Also, at the time of data recording, a signal from the PU unit 15 is also detected, and data for controlling the PU unit 15 and the disk drive unit 16 is notified to the servo control unit 14. To transmit data sent from the PU unit 15 to the PU unit 15.

The servo control section 14 controls the PU unit 15 and the disk drive section 16 based on the data calculated by the signal processing section 13. For example, processing such as position control of the PU unit 15, power adjustment of a laser diode (LD) as a laser light source of the PU unit 15, and speed control of a spindle motor of the disk drive unit 16 are performed.

The PU unit 15 is a laser light source L
D, and irradiates the optical disk 2 with a laser beam,
This is a unit for reading data based on the reflectance of the returned light. At the time of data reproduction, a process of transferring data read from the optical disc 2 to the signal processing unit 13 is performed.

At the time of writing data, the optical disk 2 is irradiated with laser light in a fixed waveform pattern, and a process of writing data sent from the signal processing unit 13 to the optical disk 2 is performed. Further, at the time of writing and reproducing data, a seek for moving the unit including the LD itself to the reading / writing position on the optical disk 2 at the same time,
Processing such as tracking and focusing is also performed.

The disk drive unit 16 includes a servo control unit 14
The rotation speed of the optical disk 2 is controlled based on the signal transmitted from the optical disk 2. The host I / F 17 serves as an interface with the host machine 3, passes user data received from the host machine 3 to the encoder of the encoder / decoder 12 when recording data on the optical disc 2, and reproduces data from the optical disc 2 when reproducing data from the optical disc 2. A process of transmitting user data transmitted from the decoder of the encoder / decoder 12 to the host machine 3 is performed.

That is, the optical disk drive 1 includes the CPU 10 and the encoder / decoder 1 for realizing the optical information recording / reproducing apparatus according to claim 1 of the present invention.
2. The reference value determination test writing in which the signal processing unit 13, the servo control unit 14, the PU unit 15, and the like change the recording laser power stepwise in the test writing area on the recording medium and test-write the test signal. Means for detecting a reproduction state of a test signal test-recorded and recorded by the reference value determining test-writing means to determine a reference value of the optimum recording power; and writing data on a recording medium. A test writing means for determining the optimum recording power and a test writing means for determining the optimum recording power, which test-writes the test signal by changing the recording laser power stepwise around the reference value of the optimum recording power in the data area to be performed. The function of the optimum recording power determining means for detecting the reproduction state of the test signal recorded by test writing and obtaining the optimum recording power is achieved.

Further, test write recording position setting means for setting the test write recording position in the data area to a different position each time the test write recording is performed, and after the test write recording in the data area, the data in the test write recording area is stored. When the radial distance between the area where the test signal is test-written by the test writing data erasing means for erasing and the test writing means for optimizing the recording power and the area where the data is written becomes equal to or more than a certain value, It also functions as a means for re-determining the optimum recording power.

The optical disk drive 1 is provided with the CPU 10, the encoder / decoder 12, and the optical information recording / reproducing apparatus according to the second aspect of the present invention.
A reference value determination test writing means for test writing a test signal by stepwise changing a recording laser power in a test writing area on a recording medium by the signal processing unit 13, the servo control unit 14, the PU unit 15, and the like; An optimum recording power reference value determining means for detecting a reproduction state of a test signal test-recorded by the reference value determining test writing means to obtain a reference value of optimum recording power, and data for writing data on a recording medium An optimum recording power reference value changing means for changing the reference value of the optimum recording power obtained by the optimum recording power reference value determining means based on the linear velocity for the area; and an optimum recording in a data area for writing data on the recording medium. The test is performed by changing the recording laser power stepwise around the reference value of the optimum recording power changed by the power reference value changing means. A test writing means for determining an optimum recording power for test writing and recording a signal, and an optimum recording power determining means for detecting a reproduction state of a test signal test-recorded by the test writing means for determining an optimum recording power and obtaining an optimum recording power. Perform the function.

FIG. 2 is a diagram showing a format of a recording area of the optical disc 2. The recording area of the optical disc 2 includes a power calibration area (PCA area) 20, a program memory area (PMA area) 21, a lead-in area 22, a data area 23, and a lead-out area 24.

The PCA area 20 is located at the innermost periphery of the optical disk 2 and is a test writing area used for test writing of a test signal at the time of data recording. Find the reference value. Program Memory Area
The a: PMA) area 21 is an area for storing a history of data (information) recorded in the data area 23.

The lead-in area 22 includes a data area 23
Area for storing index information of data recorded in the. The data area 23 is located between the lead-in area 22 and the lead-out area 24. At the time of data recording, test writing of a test signal is performed based on the reference value of the optimum recording power to obtain the optimum recording power. This is an area where user data is recorded with recording power. The lead-out area 24 is an area for storing a code indicating the end of the recording area of the optical disc 2 and the like.

Next, a description will be given of an optimum recording power determining process in the optical disc drive 1 relating to the optical information recording / reproducing apparatus of the first aspect of the present invention. FIG. 3 is a flowchart showing the optimum recording power determination processing.

FIG. 4 is a diagram showing an example of a change in LD recording power at the time of test writing in the PCA area. FIG.
FIG. 7 is a diagram showing an example of a change in LD recording power at the time of test writing to a data area.

As shown in FIG. 3, in the optimum recording power determination processing, the servo control unit 14 performs test writing in the PCA area 20 on the optical disk 2 in step (indicated by "S" in the figure) 1. L of the PU unit 15
The PU unit 15 is moved so that the irradiation light of D matches the writing area of the PCA area 20.

In step 2, a test signal of a predetermined recording pattern is written in the PCA area 20. At this time, the recording power of the LD is changed stepwise as shown in FIG. Write test record.

For example, when the optical disk 2 is a phase-change medium, two kinds of powers, a recording power and an erasing power, are alternately applied to the optical disk 2 so that the irradiation of the LD has a certain waveform pattern. Then, a mark is formed on the recording area of the optical disc 2.

Thereafter, the process proceeds to step 3 where the PCA area 2
0 to the part where the test write was recorded at
Irradiates the reflected light to the PU unit 15.
Photo Diode (Photo Diode:
The data on the optical disc 2 can be read by the detection by the PD).

Proceeding to step 4, test write recording of a test signal in the PCA area 20 involves writing data with a plurality of recording powers, so that the characteristics of the reproduced signal differ for each recording power. Therefore, the characteristics of the reproduced signal are detected, and the recording power corresponding to the optimum one among the characteristics is determined as the reference value of the optimum recording power.

For example, if the waveform pattern has a waveform in which the writing of the long mark and the short mark is repeated, the average value level of the reproduced signal of each mark is obtained at the time of reproduction, and the difference is detected to obtain the optimum recording power. The reference value can be easily obtained.

That is, from among the plurality of reproduction signals obtained by the test writing, a reproduction signal with a minimum difference in the average value level is obtained, and the recording power for the test writing recording position where the reproduction signal is obtained is optimally recorded. Determine the power reference value. Of the recording powers shown in FIG. 4, the recording power of the LD indicated by the broken line in the figure is the optimum recording power reference value P0.

Next, proceeding to step 5 in FIG. 3, the servo control unit 14 controls the LD unit of the PU unit 15 to write the test write in the data area on the optical disk 2.
PU so that the irradiation light of
The unit 15 is moved. Proceed to step 6 and FIG.
As shown in (1), the test signal is written with a plurality of recording powers by gradually changing the recording power of the LD in a narrower range around the reference value of the optimum recording power obtained in the PCA area 20.

At this time, since the reference value of the optimum recording power is obtained in the PCA area 20 in advance, it is not necessary to increase the distribution of the LD recording power in the data area 23. Can be.

Then, the process proceeds to a step 7, wherein the data area 2
In the part where the test writing was performed, the LD
Irradiates the reflected light to the PU unit 15.
By detecting the PD inside, the data of the test signal that has been trial-written in the data area on the optical disk 2 is read.

In step 8, the characteristics of each reproduced signal of the test signal data test-recorded in the data area 23 are detected, and the recording power corresponding to the optimum one among the characteristics is set to the optimum recording power. decide. For example, based on the reference value P0 of the optimum recording power shown in FIG. 4, the optimum recording power is obtained by test writing in five steps in a small area centered on the reference value P0 of the optimum recording power as shown in FIG. You can ask.

As described above, after the approximate value of the optimum recording power is obtained by using the PCA area 20, the test writing is performed in the data area 23 with the obtained value as the reference value. PCA area 2 without using
The optimum recording power at the data writing position can be obtained more accurately than the optimum recording power obtained at 0.

Next, a description will be given of an optimum recording power determining process in the optical disc drive 1 relating to the optical information recording / reproducing apparatus according to the second aspect of the present invention. The optical disc 2 has a format in which the linear velocity differs between the inner circumference and the outer circumference. In this case, as a matter of course, the recording characteristics differ depending on the radial position, so that the optimum LD power also differs depending on the radial position.

That is, since the reference value of the optimum recording power obtained in the PCA area is the optimum recording power at the radial position of the PCA area, it differs from the optimum recording power of the area where data is actually recorded. Therefore, it is preferable to change the reference value of the optimum recording power according to the linear velocity of the area where data is actually written.

In this optimum recording power determination processing, the servo control unit 14 controls the L level of the PU unit 15 to perform test writing in the PCA area 20 on the optical disc 2.
The PU unit 15 is moved so that the irradiation light of D matches the writing area of the PCA area 20.

A test signal of a predetermined recording pattern is written in the PCA area 20. At this time, the recording power of the LD is changed stepwise as shown in FIG. Perform

Thereafter, by irradiating the LD with a predetermined reproduction power to a portion of the PCA area 20 on which test writing has been performed, the reflected light is detected by the PD in the PU unit 15 and the data on the optical disk 2 is read. Then, the characteristic of each reproduction signal is detected, and the recording power corresponding to the optimum one among the characteristics is determined as the reference value of the optimal recording power. In each recording power shown in FIG. 4, L indicated by a broken line in FIG.
The recording power of D is the optimum recording power reference value P0.

Further, the reference value of the optimum recording power is changed based on the linear velocity for the data area. FIG. 7 is a diagram showing another example of a change in LD recording power at the time of test writing to a data area.

The reference value P0 of the optimum recording power shown in FIG.
The reference value of the optimum recording power is updated by applying a correction such as a constant multiple to the reference value. In the test write recording of the test signal in the data area 23, the reference value of the changed optimum recording power as shown in FIG. Use the value P1.

Then, in order to perform test writing in the data area on the optical disk 2, the servo control unit 14 moves the PU unit 15 so that the irradiation light of the LD of the PU unit 15 matches the writing area of the data area.

Thereafter, the test signal is written with a plurality of recording powers by gradually changing the recording power of the LD in a narrower range around the reference value of the optimum recording power after the change, and the data area 23 is written. By irradiating the LD with the predetermined reproduction power to the portion where the test writing was recorded,
When the PD in the PU unit 15 detects the reflected light, the data of the test signal written in the data area on the optical disk 2 is read.

Then, the characteristic of each reproduced signal of the test signal data test-recorded in the data area 23 is detected, and the recording power corresponding to the optimum one among the characteristics is determined as the optimum recording power.

In this way, the reference value of the optimum recording power obtained using the PCA area 20 is corrected and changed in accordance with the linear velocity of the next data area 23 in which the test writing is to be performed. Since the test writing is performed in the data area 23 using the reference value as the reference value, the recording power can be changed within a range close to the optimum recording power, so that the test writing process for the data area 23 can be completed in a short time.

Next, a description will be given of a test write recording position setting process relating to the optical information recording / reproducing apparatus according to the third aspect of the present invention in the optical disk drive 1. In this processing, the position of the trial writing recording with respect to the data area 23 is set to a different position every time the trial writing recording is performed.

FIG. 6 shows the format of the data area of the optical disk 2. The data area 23 is divided into a plurality of zones 1,..., N, n + 1.
An example in which the optimum recording power is determined every time will be described.

For example, in the zone n of the data area 23, the first trial write recording is performed in the area m, and the zone n + 1
, The first trial write recording is performed in the area k. Then, at the time of the test write recording of the next test signal, the areas m + 1 and k
The test write recording position is changed so as to perform +1. In this way, the test writing recording position is set so that a different area is used every time the test writing of the test signal is performed.

In this manner, the number of times of trial writing in each zone of the data area 23 is reduced, so that deterioration of recording characteristics due to an increase in the number of times of rewriting on the optical disk 2 can be suppressed, and optimum recording can be performed over a longer period. Can be recorded with power.

Next, a description will be given of a test write recording data erasing process in the optical disc drive 1 relating to the optical information recording / reproducing apparatus according to claim 4 of the present invention. This process
After test recording of the test signal in the data area 23,
This is for erasing the data in the area where the test writing was recorded.

As described above, when test writing is performed to obtain the optimum recording power using the data area 23, the range of the recording power is widened, and the area for recording with higher power than the original recording power is also required. Exists. And when overwriting the area recorded with high power,
There is a risk that the recording characteristics will be degraded.

Therefore, it is possible to prevent the deterioration of the recording characteristics by obtaining the optimum recording power by trial writing in the data area 23 and then erasing the data once in the trial writing area in the data area 23. it can.

Next, a process for re-determining the optimum recording power in the optical disc drive 1 relating to the optical information recording / reproducing apparatus according to claim 5 of the present invention will be described. In this processing, when the radial distance between the area where the test signal is test-written and recorded and the area where data is written becomes larger than a certain value by the optimum recording power determination test writing processing, the optimum recording power is calculated again. Things.

In the above-described optimum recording power determination processing,
If the radius position of the test recording area and the data recording area on the optical disk 2 are different, the LD characteristics due to a temperature change in the optical disk drive 1, the characteristics of the optical components and the recording medium of the optical disk 2, change, Since the power of the laser beam from the LD on the disk surface changes due to the tilt, the obtained optimum recording power may not be the optimum value at the position where data is recorded.

If the radial position between the area for recording data and the area for which the optimum recording power is determined is separated by a certain value or more, it is determined that various characteristics are different, and test write recording at the data recording position is performed again. The optimum recording power is determined again. In this way, writing can always be performed accurately and with optimum power.

[0071]

As described above, according to the optical information recording / reproducing apparatus according to the present invention, the optimum recording power at the time of data recording is more accurately obtained by trial writing using the data area, It is possible to reduce the amount of trial writing and reduce the deterioration of the data area.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical disk drive which is an embodiment of an optical information recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram showing a format of a recording area of the optical disc shown in FIG.

FIG. 3 is a flowchart showing an optimum recording power determining process for the optical information recording / reproducing apparatus according to claim 1 of the present invention in the optical disk drive shown in FIG.

FIG. 4 is a diagram showing an example of a change in LD recording power at the time of trial writing in a PCA area of an optical disc in the optical disc drive shown in FIG. 1;

5 is a diagram showing an example of a change in LD recording power at the time of trial writing to a data area of an optical disc in the optical disc drive shown in FIG. 1;

FIG. 6 is a diagram showing a format of a data area of the optical disc shown in FIG.

FIG. 7 is a diagram showing another example of a change in LD recording power at the time of test writing to a data area.

[Explanation of symbols]

 1: optical disk drive 2: optical disk 3: host machine 10: CPU 11: memory 18: bus 12: encoder / decoder 13: signal processing unit 14: servo control unit 15: pickup (PU) unit 16: disk drive unit 17: host Interface (I / F) 20: Power calibration area (PCA area) 21: Program memory area (PMA area) 22: Lead-in area 23: Data area 24: Lead-out area P0: Reference value of optimum recording power P1: Change Reference value of optimal recording power after

Claims (5)

[Claims] 1. An optical information recording / reproducing apparatus for optically recording / reproducing information on / from a recording medium, wherein a test signal is supplied to a test writing area on the recording medium by changing recording laser power stepwise. Reference value determining test writing means for test writing and recording; optimum recording power reference value determining means for detecting a reproduction state of a test signal test-recorded by the means to obtain a reference value of optimum recording power; Test writing means for determining the optimum recording power for trial writing and recording a test signal by changing the recording laser power stepwise around the reference value of the optimum recording power in the data area where the above data is to be written; An optimum recording power determining means for detecting a reproduction state of a test signal recorded by test writing and obtaining an optimum recording power. Biological information recording and reproducing apparatus. 2. An optical information recording / reproducing apparatus for optically recording and reproducing information on and from a recording medium, comprising: a step of changing a recording laser power to a test writing area on the recording medium in a stepwise manner; Reference value determining test writing means for test writing and recording; optimum recording power reference value determining means for detecting a reproduction state of a test signal test-recorded by the means to obtain a reference value of optimum recording power; An optimum recording power reference value changing means for changing a reference value of the optimum recording power obtained by the optimum recording power reference value determining means based on a linear velocity with respect to a data area in which the above data is written; In the data area where data is to be written, centering on the reference value of the optimum recording power changed by the optimum recording power reference value changing means. Test writing means for determining the optimum recording power for test-recording the test signal by changing the recording laser power step by step; and detecting the reproduction state of the test signal recorded by the test writing by the means and determining the optimum recording power. An optical information recording / reproducing apparatus comprising a recording power determining means. 3. The optical information recording / reproducing apparatus according to claim 1, wherein the test recording means for determining the optimum recording power is set to a position different from the position of the test recording for the data area every time the test recording is performed. An optical information recording / reproducing apparatus comprising a test writing recording position setting means for setting. 4. The optical information recording / reproducing apparatus according to claim 1, further comprising: a test write recording data erasing unit for erasing data in the test write recorded area after the test write recording on the data area. An optical information recording / reproducing apparatus characterized by the above-mentioned. 5. The optical information recording / reproducing apparatus according to claim 1, wherein a region in which a test signal is test-written by the optimum recording power determining test writing unit and a region in which data is written are radially shifted. When the distance exceeds a certain value,
An optical information recording / reproducing apparatus comprising means for re-determining an optimum recording power.