JPH09282663A - Information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of information and recording capacity by controlling a recording mark to be recorded in a recording medium with high accuracy. SOLUTION: A focusing target point is optimized by means of a power monitoring circuit 21 and a servo driving circuit 23, a recording pulse stored is generated by means of a trial data generating circuit 18 and a recording pulse generating circuit 15 and a recording mark is recorded in a recording medium 5 by a laser driver 14. Two kinds of trial data are detected from a reproducing signal from the recording medium in a trial data detecting circuit 12, a recording power whose difference becomes zero (recording condition deviating signal) is calculated from the linear regression and made to be the optimum power. On the basis of an optimum recording power from a temp. detector, by using about the power or plural recording powers lower than the basis, trial writing is executed and 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 information recording / reproducing apparatus for recording / reproducing on / from a recording medium, and more particularly to a recording / reproducing apparatus using a highly accurate setting method of optimum recording power by thermal recording. is there.

[0002]

2. Description of the Related Art A conventional optimum recording power setting method is, as in the trial write recording control method disclosed in Japanese Patent Laid-Open No. 7-73468, a peak level of a reproduction signal amplitude obtained from an isolated mark pattern and a repetitive mark pattern. The recording control is performed such that the level difference between the peak levels of the reproduced signal amplitude obtained from the above is minimized. The trial write recording control method is a method of setting predetermined recording power by recording predetermined data on an optical disc and reproducing the recorded data.

[0003]

The above-mentioned prior art is a system for performing recording control so that the level difference between the peak levels of the reproduced signal amplitude obtained from the isolated mark pattern and the repetitive mark pattern is minimized. A setting error of the optimum recording power occurs by the minimum change of. Further, the increase in the required recording power due to the defocus due to the temperature of the recording / reproducing apparatus and the defocus due to the change over time, etc. is not taken into consideration. Since the laser power exceeds the limit value due to the increase in power, there is a problem that the recording control for forming a highly accurate recording mark cannot be performed.

Further, in order to carry out the recording control with high accuracy, it is necessary to reduce the minimum change amount of the recording power, and it is not taken into consideration that a huge execution time and a detection error occur due to this. There is a problem that recording control cannot be performed with high accuracy and in a short time.

An object of the present invention is to suppress an increase in required recording power due to defocus of a recording / reproducing apparatus, and
It is an object to optimize the recording power for forming a highly accurate recording mark by suppressing the fluctuation of the recording mark due to the fluctuation of the recording sensitivity in accordance with the fluctuation of the film thickness of the recording medium and the fluctuation of the ambient temperature.

Another object of the present invention is to improve the reliability of the recording / reproducing apparatus and the storage capacity and the transfer rate of information.

Another object of the present invention is to suppress the characteristic change of the recording medium due to excessive power and improve the reliability of the recording / reproducing apparatus by extending the life of the light source.

[0008]

In order to achieve the above object, in order to improve compatibility between a recording medium and an apparatus for recording / reproducing and erasing, at least a defocus of the recording / reproducing apparatus is corrected at the time of exchanging the recording medium. By optimizing the positional relationship between the recording medium and the objective lens (referred to as AF (autofocus) target point optimization), the increase in recording power by the apparatus is suppressed, and the sensitivity fluctuation of the recording medium and the environmental temperature fluctuation are suppressed. In order to achieve this, recording is performed by forming test writing data on the recording medium in advance using a plurality of recording powers at predetermined positions on the recording medium, and is obtained from the reproduced signal of the recorded test writing data. Based on the output signals depending on a plurality of recording powers, a plurality of recording powers near the optimum recording power are calculated by linear regression and recorded.
The optimum recording power below the step of is the recording power of regular information.

In order to achieve the above-mentioned other object, in order to suppress the necessary recording power due to the defocus of the recording / reproducing apparatus, a scoop signal reflecting the state of the composite resonator by the laser and the recording medium is detected, and the scoop signal is detected. By setting the maximum focus position as the optimum target point of the in-focus point (AF),
This is to suppress the increase of the recording power due to the fluctuation of the recording / reproducing apparatus to the minimum.

In order to achieve the above-mentioned other objects, the optimum recording power is calculated by linear regression and the recording power of regular information is calculated.
In the trial writing method, the recording power of several points before and after the optimum recording power for executing the linear regression.
Is used to calculate the optimum recording power with high accuracy.

In order to achieve the above-mentioned other objects, the optimum recording power is calculated by linear regression and the recording power of regular information is calculated.
In the trial writing method described above, when a plurality of recording powers are recorded at predetermined positions on the recording medium, in order to adapt to environmental temperature and sensitivity fluctuations of the recording medium, the trial writing data is changed from the low recording power. -The optimum recording power is always found by recording the data.

Further, by processing a plurality of recording powers in several stages, the recording medium is not irradiated with excessive power and the output of the light source is suppressed as much as possible to prolong the life of the light source. Therefore, the reliability of the recording medium and the recording / reproducing apparatus is improved.

In order to achieve the above-mentioned other objects, the optimum recording power is calculated by linear regression and the recording power of the regular information is calculated.
In the test writing method, the test writing data is erased by using the maximum recording power in which the test writing data is recorded as the erasing power in order to erase all the test writing data sequentially recorded. Thus, the processing time required for trial writing can be shortened, so that the reliability of information is improved and the transfer rate is improved.

In order to achieve the above-mentioned other objects, in a trial writing method in which a temperature detector is used in combination and the optimum recording power is calculated by linear regression to obtain regular information recording power, the temperature inside the recording / reproducing apparatus is If it exceeds a certain range, the AF target point is optimized before the recording power is optimized.
After that, the optimum recording power expected from the output signal of the temperature detector is used as a reference, and a plurality of recording powers before and after or lower than the reference are used as test writing recording power,
The power range for detecting the optimum recording power is narrowed, and the power recording used for trial writing can be reduced, so that the optimum recording power setting processing time is shortened and the optimum recording power is detected with high accuracy. It is a thing.

In order to achieve the above-mentioned other objects, in a trial writing method in which a temperature detector is used in combination and the optimum recording power is calculated by linear regression to obtain regular information recording power, a recording medium is used as a recording / reproducing apparatus. At the time of insertion, trial writing is performed, the obtained optimum recording power is related to the output signal of the temperature detector at the time of trial writing, and then optimum recording is performed according to the change amount of the output signal of the temperature detector. By updating the power, the number of trial writing processes is reduced and the information transfer rate is improved.

[0016]

Embodiments of the present invention will be described below. FIG. 1 shows an embodiment of the device configuration of the present invention.

Here, 1 is a laser, 2 and 4 are lenses, 5 is a recording medium, 7 is a photodetector, 9 is a reproducing circuit, and 12
Is a trial write data detection circuit, 18 is a trial write data generation circuit, 19 is a controller, 21 is a power monitoring circuit, 2
2 is an actuator, and 23 is a servo drive circuit.

The information recording / reproducing apparatus includes an optical head centering on the laser 1, a recording medium 5 for storing information, a recording processing system centering on a recording pulse generating circuit 15, and a reproducing obtained from the optical head. The reproduction processing system mainly includes a reproduction circuit 9 for converting a signal into information. The recording medium 5 includes a recording film and a substrate holding the recording film.

An instruction and information data from the host are decoded in the controller 19 and the recording data is modulated, and converted into a code string corresponding to the modulation method. The synthesizer 16 is an oscillator that generates a reference clock for the entire apparatus, and as a method of increasing the capacity, the ZC is used to change the reference clock for each zone so that the recording density at the inner and outer circumferences becomes substantially constant.
AV (Zoned Constant Angular)
When a recording method called "Velocity" is adopted, it is necessary to change the oscillation frequency of the synthesizer 16 according to the zone.

First, in order to correct the defocus of the recording / reproducing apparatus when the recording medium is exchanged to optimize the positional relationship between the recording medium and the objective lens (referred to as AF (autofocus) target point optimization). , The controller 19 outputs the initial value, which is the target point of the servo, to the servo circuit 23 at a predetermined position of the recording medium in advance, and the actuator 22
A light spot is formed on the recording medium 5. Later Figure 3
As described in detail with reference to FIG. 1, in order to minimize the required recording power due to the focus shift caused by the temperature of the recording / reproducing apparatus and the change over time, the AF offset is set in the servo drive circuit to move the objective lens in the recording medium direction. 3 (B in FIG. 3), the photodetector 20 detects the amount of light generated by the scoop effect that reflects the state of the composite resonator formed by the laser and the recording medium, and the power monitoring circuit 21 detects the scoop signal. The scoop signal shows the maximum output level at the optimum AF target point.

From the scoop signal output level, the controller 19 determines the optimum AF offset, that is, the position of the objective lens at the in-focus point with respect to the recording medium, and the AF is performed.
The offset is set as the optimum AF target point. The servo can obtain a focus error signal and a track error signal by a cylindrical lens (not shown) arranged in front of the photodetector 7 and the photodetector (four divisions) 7.

Next, in the trial writing, in order to improve compatibility between the recording medium and an apparatus for performing recording, a change in film thickness of the recording medium due to replacement of the recording medium or the like at a predetermined position of the recording medium in advance, An operation of writing test writing data on the recording medium before recording the regular information for detecting the recording sensitivity variation on the recording medium due to the environmental temperature variation and the characteristic change of the recording apparatus is performed.

This trial writing data is converted into a code string corresponding to the modulation system, and the trial writing data generating circuit 18
Generate at. Here, the test writing data generates data other than the modulation method, and the test writing data detection circuit 12
It is also possible to operate in association with. As a result, it becomes possible to perform trial writing corresponding to an arbitrary recording density and recording method by using arbitrary trial writing data.

A code string modulated according to the regular information data from the controller 19 and a trial writing data generating circuit 1
The code string from 8 is input to the selector 17 and
The control signal of the line 19 is used to switch the test writing process or the normal recording process. The code train from the selector 17 enters the recording pulse generation circuit 15 and is converted into a recording pulse train for controlling the length and width of the recording mark.

These recording pulse trains are transmitted to the laser driver 14
The laser 1 oscillates at a high output by the recording current from the laser driver 14, and the light emitted from the laser 1 is collimated by the lens 2 and passes through the prism 3 to be recorded by the lens 4. The recording mark is converged on the medium 5 and a recording mark corresponding to the code string is recorded. The high frequency superimposing circuit 13 is provided to reduce the laser noise caused by the laser 1, and during recording / erasing, the high frequency superimposing circuit may be suspended from the viewpoint of the life of the laser.

At the time of reproduction, the laser 1 is oscillated at a low output and is made incident on the recording medium 5. The light reflected from the recording medium 5 is split into an optical path by the prism 3 and is incident on the photodetector 7. After the photoelectric conversion by the photodetector 7, the signal is amplified by the preamplifier 8 and input to the reproducing circuit 9. The reproducing circuit 9 is composed of a waveform equalizing circuit, an automatic gain control circuit, a binarizing circuit, etc., and makes the inputted reproducing signal a binarized signal.

The binarized signal from the reproducing circuit 9 is PLL (Phase Locked) for self clocking.
Loop) is input to the circuit 10. The reproduction clock and the binarized signal, which are obtained by the PLL 10 and are synchronized with the binarized signal, are input to the discrimination circuit 11 for the data discrimination, and the resulting data discrimination signal is input to the controller 19. And the data is demodulated.

Recording and reproducing of information using an externally applied magnetic field,
In a magneto-optical disk device for erasing, an external magnetic field generator 6 is provided and the direction of the magnetic field is switched during recording / erasing to irradiate the recording / erasing power. During reproduction, the reflected light is separated into p-polarized light and s-polarized light by a wave plate (not shown) arranged in front of the photodetector 7 and each of them is differentiated by the photodetector (division 2) 7. A magneto-optical signal can be obtained.

At the time of trial writing processing, the trial writing data detection circuit 12 produces a reproduced signal in an analog signal state from the reproducing circuit 9.
Lead to. As will be described in detail later, as a recording pattern used in the trial writing process, a combination pattern of the highest frequency closest pattern and the lowest frequency closest pattern in the apparatus.
In the reproduced signal, the center level of the densest pattern and the center level of the sparsest pattern are detected by the trial write data detection circuit 12, and the difference between the center levels is controlled.
The recording power obtained by the A / D converter incorporated in the laser 19 and subjected to the center level difference and the trial writing is linearly regressed, and the recording power when the center level difference becomes 0 in calculation is the optimum recording power. It is determined that the normal recording is performed. In this way, by trial writing, it is possible to record a highly accurate recording mark by always setting the optimum power.

Next, an operation example of a flowchart of the AF target point optimization and trial writing processing procedure of the present invention will be described with reference to FIG. The device is operated by turning on the power supply of the device. First, it is determined whether a recording medium is loaded in the apparatus, and if there is no recording medium, the standby state is left as it is. If the recording medium is set in the apparatus, the recording medium is rotated and the laser is emitted. Next, the servo (auto focus: AF, tracking: TR) for controlling the light spot is started. An initial value is output from the controller 19 to the servo drive circuit 23 as a servo target point and controlled by the actuator 22.

In order to optimize the AF target point, the AF offset is changed and the scoop signal is detected a certain number of times. The offset amount to be changed is stored in the controller 19 in advance in consideration of the range in which the recording / reproducing apparatus causes the defocus. By relatively comparing the detected scoop signals in the controller 19, an AF offset amount at which the scoop signal is maximized is derived, and this AF position is set as the optimum position of the AF target point.

The above-described AF target point optimization flow, scoop signal and AF offset are shown in FIGS. 3 (A) and 3 (B). In the AF target point optimization flow of FIG. 3A, the controller 19 causes the servo drive circuit 23 to perform AF operation.
Commands for offset application, high-frequency superimposition circuit 13 to stop high-frequency superimposition, power monitoring circuit 21 for scoop signal detection, and high-frequency superposition circuit 13 to start high-frequency superposition are sequentially output, and a scoop signal is received from the power monitoring circuit 21. Here, the high frequency superimposing function is turned off to detect the scoop signal. The reason is that since the high frequency superimposing function is originally used to prevent the laser light from fluctuating due to the effect of the return light due to the scoop effect, the high frequency function is not necessary to obtain the scoop signal. .

The controller 19 can temporarily store the applied AF offset and scoop signal and judge the relative relationship between the AF offset and the scoop signal shown in FIG. 3 (B). In the present embodiment, the AF offset N5 is the optimum value of the AF target point rather than the initial value (N4).

Next, in order to confirm the compatibility between the input recording medium and the apparatus, a trial writing operation is performed. As will be described later, the trial writing according to the present invention is performed by a relative change in recording sensitivity with respect to the recording medium due to a change in film thickness of the recording medium or an environmental temperature change and a change in the state of the apparatus (laser emission state, light spot position control state, etc.). The recording power and recording pulse are controlled to minimize the fluctuation of the recording mark caused by the fluctuation of recording sensitivity, the recording condition deviation signal is detected from the reproduction signal, and the recording condition deviation signal within the allowable range and the trial writing are performed. The recording power used for the above is linearly regressed, and the recording power at which the deviation signal (difference between the center level of the densest pattern and the center level of the sparsest pattern) is 0 is determined as the optimum recording power.

After that, in order to erase the trial writing data, the maximum power used in the trial writing is set as the erasing power.
Delete all recorded test writing data. The normal recording / reproducing operation of the apparatus is started after the above trial writing processing is completed.

FIG. 4 shows an embodiment of trial writing data detection and optimum recording power calculation. As trial writing data, a repetitive pattern of a close-packed pattern (2Tw in the case of (1,7) RLL code) having the highest frequency and a sparsest pattern (8Tw) having the lowest frequency in the device is used. FIG. 4A shows a recording mark recorded by trial writing. FIG. 4B shows a reproduction signal obtained from the recording mark of FIG. In the case of mark edge recording, it is important to control the time axis of the recording mark, and the time axis of each pattern is controlled when the center levels of the reproduction signals of the closest pattern and the most sparse pattern are equal. The recording power is the optimum power. As described above, in this embodiment, the time base fluctuation is detected by the amplitude level fluctuation.

In the trial write data detection circuit 12 of FIG. 1, the center level (V
1) and the center level (V2) of the sparsest pattern are detected, and the voltage difference ΔV = V1-V2 is calculated. The timing of detecting the center level V1 of the closest pattern is determined by the sample pulse 1 as shown in FIG. 4C, and the timing of detecting the center level V2 of the sparsest pattern is determined by the sample pulse 2.

ΔV is input to the controller 19 as a recording condition deviation signal. Example of recording condition deviation signal detection
It is shown in (D). An example of optimum recording power calculation by linear regression in the controller 19 is shown in FIG. In order to perform the linear regression with high accuracy, the deviation signal range used for the linear regression is limited, and the effective recording power is set to P3 to P8 accordingly. Here, the recording power is set to P
When the linear regression is performed from 1 to P8 as effective, the optimum recording power is attracted toward P5 which is the low power side due to the weight of the deviation signal of P1 and P2, the recording mark becomes small, and the normal data is deleted. Signal quality deteriorates and the reliability of the device deteriorates.

FIG. 5 shows an embodiment of the center level detection of the trial writing data used in the trial writing data detecting circuit 12. Here, a low-pass filter is provided for the reproduced signal from the reproducing circuit 9 to detect the average level of the reproduced signal, and thereafter, two sample and hold circuits detect the average level V1 as the average level for each data. V2
Is detected, and ΔV (recording condition deviation signal) is input to the controller 19 by the differential amplifier.

FIG. 6 shows another embodiment of the device configuration of the present invention. The apparatus configuration is almost the same as in FIG. 1, but a temperature detector 24 is arranged near the recording medium. Temperature detector 24
Measures the temperature of the recording medium or the device or the temperature around them. The output obtained from the temperature detector 24 may be a temperature-dependent electric signal. AF using the output
Target point optimization and trial writing processing are performed.

FIG. 7 shows an AF target point optimization and trial writing process flow when the temperature detector 24 is used. Although it is almost the same as the processing procedure shown in FIG. 2, the controller 19 temporarily stores the output (A) of the temperature detector 24 before the optimization of the AF target point is started.

Further, after the regular recording / reproducing operation of the apparatus is started, the controller 19 periodically detects the temperature (B),
The detected outputs A and B are compared, and in the present embodiment, if a difference of 10 ° C. or more occurs, the AF target point optimization and trial writing processing are performed again. As a result, it is possible to suppress an increase in recording power due to a focus shift or the like due to a temperature change, and it is possible to extend the life of the laser.

In the trial writing process, before outputting the trial writing command signal, the controller 19 controls the output signal of the temperature detector 24 so that the temperature around the recording medium or the apparatus immediately before the trial writing is controlled. The optimum recording power is predicted based on the measured or electric signal depending on the temperature. in this case,
The recording power and the temperature (electrical signal depending on temperature) related to the temperature of the recording medium or the electric signal depending on temperature are stored in a memory (not shown) in the controller 19.

Thus, the optimum recording power expected from the output of the temperature detector is used as a reference, and a plurality of recording powers before or after the optimum recording power are used as test writing recording powers, so that the recording power is highly accurate and short. Since the trial writing process can be executed in time, a high recording density of the recording / reproducing apparatus is achieved, and reliability and information transfer rate (actual data processing transfer rate including trial writing process) are improved. be able to.

FIG. 8 shows the optimum recording power using a temperature detector.
A calculation example is shown. A case where the optimum recording power expected from the output signal of the temperature detector 24 is P6 will be described.
In the present embodiment, the recording power P6 is used as a reference, and two points before and after the reference are used as the recording power (P4 to P8) for trial writing. FIG. 8 shows the relationship between the deviation signal (ΔV) obtained by actual recording and the recording power.

It is determined whether the deviation signal obtained here is within the range used for linear regression. The optimum recording power shown in the figure can be calculated by linearly regressing the recording power and the deviation signal within the range.

One embodiment of the linear regression performed in the controller 19 is shown below.

1 Number of trial writing powers: n = 5 2 Linear regression: Y = AX + B A is a slope, B is an intercept, Y is ΔVm, X is Pm: (m = 4
~ 8) 3 ΣX = P4 + P5 + P6 + P7 + P8 4 ΣY = ΔV4 + ΔV5 + ΔV6 + ΔV7 + ΔV8 5 ΣXY = P4 · ΔV4 + P5 · ΔV5 + P6 · ΔV
6 + P7 ・ ΔV7 + P8 ・ ΔV8 6 (ΣX) ² = ΣX ・ ΣX 7 ΣX ² = P4 ・ P4 + P5 ・ P5 + P6 ・ P6 + P
7 · P7 + P8 · P8 8 A = [n · ΣXY−ΣX · ΣY] / [n · ΣX ² −
(ΣX) ² ] 9 B = [ΣX ² · ΣY−ΣX · ΣXY] / [n · ΣX ²
-(ΣX) ² ] 10 X = (Y−B) / A Here, in the optimum recording power, Y = 0 X = (− B) / A The optimum recording power is highly accurately achieved by performing the above operation. And it can be obtained in a short time.

As described above, a plurality of effective recording powers near the optimum recording power are calculated by linear regression, and ΔX =
It is possible to obtain the optimum recording power which is equal to or less than the recording power step where the recording power becomes zero. In the example of FIG. 4E, P6
The recording power slightly smaller than that (the point where the regression line crosses ΔV = 0) is the optimum recording power.

Furthermore, it is also possible to carry out the above linear regression using P3 to P5 which are lower than the optimum recording power P6 expected from the temperature detector (including the optimum recording power P6). Does not matter). According to this method, since the recording power at the time of trial writing can be set as low as possible, the recording medium is not irradiated with excessive power, so that the characteristic change of the recording medium is suppressed and the life of the light source is extended. The reliability of the recording / reproducing apparatus can be improved.

The optimum recording power using a temperature detector
In the detection, the output signal of the temperature detector at the time when the recording medium is inserted into the recording / reproducing apparatus is associated with the optimum recording power obtained from the trial writing. After that, the optimum recording power is updated according to the change amount of the output signal of the temperature detector or the measured temperature, so that the number of trial writing processes can be reduced and the information transfer rate can be improved.

The relationship between the temperature of the temperature detector and the optimum recording power obtained from the trial writing will be described below. The optimum recording power at 25 ° C. is stored in the memory in the controller 19. Let K be the amount of change in recording power standardized by this optimum recording power, and T be the temperature obtained from the temperature detector. The change amount K of the recording power has the following relationship with the environmental temperature or the temperature of the recording medium.

K = −0.01 × T + 1.25: T = 25 ° C. K = 1: T = 50 ° C. K = 0.75: T = 0 ° C. K = 1.25 However, the environmental temperature is 0. It can be applied within a range in which linear approximation can be performed in the vicinity of ℃ to 50 ℃. In the above relational expression of power and temperature, the trial writing is not necessary, but actually the trial writing is indispensable due to the variation of the device.

As one of the causes, there are variations in recording power among devices, variations in optical spot intensity due to aberration of the optical head, and the like. In order to absorb variations in these recording powers, the above relational expression of power and temperature is also used. By applying the above, the power obtained by trial writing and the output signal of the temperature detector can be associated with each other, and it is possible to deal with one trial writing process when the recording medium is inserted, so that the information transfer rate can be improved. You can

[0055]

According to the present invention, fluctuations in recording sensitivity to a recording medium and fluctuations in recording sensitivity due to a recording / reproducing apparatus due to fluctuations in film thickness of the recording medium and environmental temperature fluctuations are suppressed, and compatibility between the recording / reproducing apparatus and the recording medium is suppressed. And the recording mark can be controlled with high accuracy, which has the effect of improving the reliability of the recording / reproducing apparatus, the recording capacity, and the information transfer rate. Further, it is possible to suppress the characteristic change of the recording medium due to excessive power and to improve the reliability of the recording / reproducing apparatus due to the long life of the light source.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention.

FIG. 2 is a flowchart of an example of AF target point optimization and trial writing processing procedures.

FIG. 3 AF target point optimization flow and scoop signal and A
It is a graph for explaining the relationship of F offset.

FIG. 4 is a graph for explaining an example of optimum recording power calculation by linear regression in trial writing.

FIG. 5 is a block diagram of an embodiment of a center level detection circuit for trial writing data.

FIG. 6 is a block diagram illustrating another embodiment of the present invention.

FIG. 7 is a flowchart of an example of AF target point optimization and trial writing processing procedures using a temperature detector.

FIG. 8 is a graph for explaining an example of optimum recording power calculation using a temperature detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 laser 2, 4 lens 5 recording medium 7 photodetector 9 reproduction circuit 10 PLL 11 discrimination circuit 12 trial write data detection circuit 14 laser driver 15 recording pulse generation circuit 18 trial write data generation circuit 19 controller 21 power monitoring circuit 22 actuator 23 Servo drive circuit 24 Temperature detector

Claims (5)

[Claims] 1. A recording medium is recorded on a recording medium at a predetermined position while changing the recording power, and is recorded on a recording medium based on an optimum recording power obtained from a reproduced signal of the recorded test writing data. In an information recording / reproducing device for recording regular information, in order to correct the defocus of the recording / reproducing device and optimize the in-focus target point, an in-focus offset input is applied,
The position where the scoop effect that reflects the state of the composite resonator by the light source and the recording medium is maximized is detected, and the detected position is set as the optimum focus position, and the recording power is changed based on the setting. A recording / reproducing apparatus for information, characterized in that the trial writing data is sequentially recorded on a recording medium, and an optimum recording power is obtained from a reproduction signal of the recorded trial writing data. 2. The method according to claim 1, wherein when setting the optimum focus position where the scoop effect is maximized, high frequency superposition is stopped after applying a focus offset input, and laser output light due to the scoop effect is detected optically. Detector, temporarily store the detected value and the in-focus offset input, start high-frequency superimposition to change and apply the in-focus offset input again, apply a predetermined in-focus offset input, and scoop. An information recording / reproducing apparatus, characterized in that an in-focus position where the effect is maximized is set to an optimum in-focus position. 3. A test recording data is recorded at a predetermined position on the recording medium while changing the recording power, and is recorded on a recording medium based on an optimum recording power obtained from a reproduction signal of the recorded test writing data. In an information recording / reproducing device for recording regular information, in order to correct the defocus of the recording / reproducing device and optimize the in-focus target point, an in-focus offset input is applied,
The position where the scoop effect that reflects the state of the composite resonator by the light source and the recording medium is maximized is detected, and the detected position is set as the optimum focus position, and the recording medium or the recording / reproducing is performed based on the setting. The temperature of the device or the temperature around them is measured, and the optimum recording power expected from the measured temperature is used as a reference, and a plurality of recording powers before or after the reference or lower than the reference are used as the recording power for the trial writing as a recording medium. The information recording / reproducing apparatus is characterized in that optimum recording power is obtained from the reproduced signal of the recorded test writing data. 4. The temperature measurement according to claim 3, wherein a difference between the temperature at the time of inserting the recording medium into the recording / reproducing device and the temperature after the start of the recording / reproducing operation of the regular information exceeds a predetermined temperature range. In this case, the information recording / reproducing apparatus is characterized in that the focus position is set again and the optimum recording power is obtained again. 5. The method according to claim 3, wherein the temperature at the time of inserting the recording medium into the recording / reproducing device and the optimum recording power under the setting of the optimum focus position are associated with each other, and An information recording / reproducing apparatus characterized in that the optimum recording power is updated according to a change in measured temperature.