JP2003099932A - Optical disk recording device and phase change optical recording medium recording device - Google Patents

Abstract

(57) [Problem] To provide a phase-change type optical recording medium recording apparatus that performs stable recording even when the temperature around the recording medium changes. When the ambient temperature of a phase change type optical recording medium is lower than a standard temperature range, the recording power and the erasing power set by the power calibration operation are smaller than the optimum values, and the recording power is reduced. Further, it is necessary to adjust the erasing power, especially the erasing power. In the method of adjusting the erasing power, the erasing power that can be applied in a wide temperature range can be obtained by using the erasing power as a function of the temperature and the erasing power obtained by the power calibration operation. Also, during power calibration operation,
It is also effective to adjust the erasing power itself obtained by the power calibration operation by setting the ratio Pe / Pw of the erasing power Pe and the recording power Pw to be larger than the value described as the ATIP information of the recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording device and a phase change type optical recording medium recording device for adjusting the detected temperature.

[0002]

2. Description of the Related Art In recent years, optical disks have become widespread as recording devices for computers and the like. The advantages of this optical disc are that the structure of the device is simple and that the recording medium is inexpensive and has a large capacity. Taking advantage of these advantages of optical discs, the number of examples in which they are mounted in portable devices such as notebook computers and digital cameras is increasing. By the way, while a general computer is mainly used in a building, a portable device is used in various environments. Therefore, it is necessary to perform stable recording / reproducing even when the surrounding environment, for example, the temperature or humidity greatly deviates from room temperature.

[0003]

When a phase change recording medium is used as the recording medium, the recording characteristics may change depending on the temperature around the recording medium. That is, for example, when a CD-RW is used as the recording medium, if the temperature around the recording medium becomes low, the temperature of the surface of the recording medium will not change even if the optimum recording power and the optimum erasing power obtained by the power calibration operation are used for recording. Recording and erasing cannot be performed sufficiently because the recording power does not rise sufficiently, and as shown in FIG. 2, the jitter greatly increases at the second recording (first overwrite). Although the recording marks are sufficiently formed even when the recording power is lowered to some extent, the erasing power tends to be insufficiently erased even if the erasing power is slightly lowered. Therefore, the decrease in the erasing power is more susceptible to the temperature change than the decrease in the recording power.

When the ambient temperature of the recording medium is higher than room temperature, the γ method which is usually used for determining the optimum recording power in the CD-RW is performed, and when the temperature of the recording surface is high, As shown in FIG. 3, the 11T signal amplitude at the same recording power becomes larger than that under the normal temperature environment. Therefore, as shown in FIG. 4, a γ curve (γ = P / m × dm
When / dP (P: recording power, m: 11T signal amplitude) is calculated and the temporary optimum recording power is calculated from γtarget, the temporary optimum recording power Pw0H at high temperature is smaller than the temporary optimum recording power Pw0 at room temperature. It becomes a value. Since the optimum recording power is a value obtained by multiplying the temporary optimum recording power obtained here by the correction coefficient p p peculiar to the recording medium, the optimum recording power PwH at high temperature is smaller than the optimum recording power Pw at room temperature. Become. Therefore, when recording is performed in a high temperature environment, the signal amplitude is reduced due to insufficient recording power, and the reproduction compatibility may be deteriorated. Moreover, when overwriting is performed at different temperatures, the above-mentioned problems become more prominent. That is, if recording is performed in a state in which the temperature around the recording medium is high with respect to a portion recorded at room temperature, recording with a small 11T signal amplitude is performed with respect to a portion having a large 11T signal amplitude. The larger the width of the mark, the larger the 11T signal amplitude.
When recording with a small 11T signal amplitude is performed on a portion with a large 11T signal amplitude, pre-recorded marks remain and jitter increases.

Therefore, an object of the present invention is to solve the above problems and provide an optical disk recording apparatus and a phase change type optical recording medium recording apparatus which perform stable recording even when the temperature around the recording medium changes. That is.

[0006]

According to a first aspect of the present invention, an optical disc recording apparatus detects a temperature around a recording medium in a state where the recording medium is housed in the apparatus, and temperature detecting means for detecting the temperature. The above object is achieved by providing a temperature notification means for transmitting the temperature detected by the means to the device.

According to a second aspect of the present invention, the phase change type optical recording medium recording apparatus detects the temperature around the phase change type optical recording medium in a state where the phase change type optical recording medium is accommodated in the apparatus. The above-described object is achieved by including the detecting means and the power adjusting means for adjusting the recording power and / or the erasing power based on the temperature detected by the temperature detecting means. According to a third aspect of the invention, in the second aspect of the invention, there is provided setting means for setting the standard temperature range as a temperature range in which stable recording can be performed at the recording power and the erasing power determined at the standard temperature. The temperature detected by the detection means
It is characterized in that, when the temperature is out of the standard temperature range set by the setting means, the power adjusting means adjusts the recording power and / or the erasing power. According to the invention of claim 4, in the invention of claim 3,
When the temperature detected by the temperature detecting means is lower than the standard temperature range set by the setting means, the power adjusting means makes the erase power larger than the optimum erase power obtained by the power calibration operation. It is characterized by

According to a fifth aspect of the invention, in the fourth aspect of the invention, the erase power is a function of the temperature obtained by the temperature detecting means and the erase power obtained by the power calibration operation. . According to a sixth aspect of the invention, in the third aspect of the invention, when the temperature detected by the temperature detecting means is higher than the standard temperature range set by the setting means, the recording power is power-calibrated. It is characterized in that it is made larger than the optimum recording power obtained by. According to a seventh aspect of the invention, in the sixth aspect of the invention, the recording power is a function of the temperature detected by the temperature detecting means and the optimum recording power obtained by the power calibration operation.

The invention according to claim 8 is characterized in that, in the invention according to claim 2, there is provided a correction means for performing correction based on the temperature detected by the temperature detection means during a power calibration operation. In the invention according to claim 9, in the invention according to claim 3 or claim 8,
When the temperature detected by the temperature detecting means is lower than the standard temperature range set by the setting means, the ratio Pe of the erasing laser power Pe and the recording laser power Pw is set.
It is characterized in that / Pw is made larger than a value peculiar to the recording medium. According to a tenth aspect of the invention, in the invention of the third or eighth aspect, when the temperature detected by the temperature detecting means is lower than the standard temperature range set by the setting means, the recording laser power is increased. The correction coefficient ρ of is larger than the value peculiar to the recording medium.

According to the invention of claim 11, in the invention of claim 3 or 8, when the temperature detected by the temperature detecting means is higher than the standard temperature range set by the setting means, It is characterized in that the correction coefficient ρ of the recording laser power is made larger than the value peculiar to the recording medium.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of a phase-change optical recording medium recording device according to an embodiment of the present invention. The recording apparatus 10 includes a phase change type optical recording medium 20, a temperature detecting means 22, a pickup 24, a signal processing system 25, a pickup control system 26, and a spindle 2.
8, spindle control system 29, drive controller 30
And an interface 32 is included. In the state where the phase change type optical recording medium 20 is installed inside the recording device 10, when an information recording command is issued through the interface 32, the temperature detecting means 22 detects the temperature around the recording medium. It is desirable to detect the temperature by the temperature detecting means 22 in the vicinity of the recording medium 10. Information about the detected temperature can be found in the drive controller 30.
When the temperature is higher or lower than the preset standard temperature, the drive controller 30 sets the recording power and / or the erasing power. Regarding the standard temperature range, it is desirable to set a range in which fluctuations in recording characteristics are not large when recording is performed at the most frequently used temperature and the recording power and erasing power determined at that temperature. By setting the standard temperature range, it is possible to use the same recording power and erasing power within the standard temperature range, and it becomes unnecessary to perform the power correction operation more than necessary.

When the ambient temperature of the phase-change optical recording medium 20 is lower than the standard temperature range, the recording power and the erasing power set by the power calibration operation are smaller than the optimum values, and the recording power and It is necessary to adjust the erase power, especially the erase power. There are various methods for adjusting the erase power, but by making the erase power a function of the temperature and the erase power obtained by the power calibration operation, the erase power applicable in a wide temperature range can be obtained. Further, during the power calibration operation, the ratio Pe / Pw of the erasing laser power Pe and the recording laser power Pw is set to the AT of the recording medium.
A method of adjusting the erase power itself obtained by the power calibration operation by making the value larger than the value described as the IP information is also effective.

It is also effective to increase the recording power by making the value of the recording power correction coefficient ρ larger than the value described as the ATIP information of the recording medium, and the erasing power accordingly. With the optimum erase power, it is possible to suppress the increase in jitter during overwriting to a small level. When the ambient temperature of the phase-change optical recording medium 20 is higher than the standard temperature, the recording power set in the power calibration operation is smaller than the optimum value, and therefore it is necessary to make a correction to increase the recording power. There is. As a correction method, the recording power applicable to a wide temperature range can be obtained by using the recording power as a function of the recording power obtained by the calibration operation and the temperature. It is also effective to make a correction by changing the correction coefficient ρ during the power calibration operation. The optimum recording power can prevent a decrease in 11T signal amplitude, ensure reproduction compatibility, and prevent an increase in jitter when a portion recorded at a low temperature or a standard temperature is overwritten.

Specific examples will be described below. (Example 1) Using a CD-RW recording device and a CD-RW medium with Pe / Pw = 0.5 at a CD linear velocity of 4X,
At a recording medium ambient temperature of -5 ° C, a CD linear velocity of 4X (4.8
The power calibration operation was performed at m / s). As a result, the recording laser power Pw was 17 mW and the erasing laser power Pe was 8.5 mW. Then, the unrecorded portion was recorded once. When the jitter in the recorded portion was measured using an optical disk evaluation device, it was 17 ns. Subsequently, when the erasing laser power was recalculated with Pe / Pw = 0.55, Pe = 9.35 mW was obtained.
After that, Pw = 17 mW and Pe = 9.35 in the recorded part.
Overwriting was performed at mW. When the jitter in the overwritten portion was measured, it was 22 ns.

(Comparative Example 1) CD-RW recording device and C
A power calibration operation was performed at a CD linear velocity of 4 × (4.8 m / s) at a recording medium peripheral temperature of −5 ° C. using a CD-RW medium with Pe / Pw = 0.5 at a D linear velocity of 4 ×. As a result, recording laser power Pw = 17 m
W, erasing laser power Pe = 8.5 mW. Then, the unrecorded portion was recorded once. When the jitter of the recorded portion was measured using an optical disc evaluation device, it was found to be 17
It was ns. Then, Pw = 17m in the recorded part
Overwriting was performed at W and Pe = 8.5 mW. When the jitter in the overwritten portion was measured, it was 31 ns.

(Embodiment 2) CD-RW recording device and C
Using the D-RW media, the power calibration operation was performed at a CD linear velocity of 4X (4.8 m / s) at a recording medium ambient temperature of 25 ° C. As a result, the recording laser power Pw = 17 mW and the erasing laser power Pe = 8.5 m
It became W. Then, the unrecorded portion was recorded once.
The 11T signal amplitude and jitter of the recorded portion were measured using an optical disc evaluation device, and were 65% and 18%, respectively.
It was ns. Then, the recording apparatus was placed in an oven with the recording medium installed and the temperature of the oven was set to 70 ° C. and left for 1 hour. The temperature around the recording medium was measured and found to be 72 ° C. Here, PwH is used as the temperature correction formula for the recording power.
= Pw × (0.92 + T / 280) was used to recalculate the recording power, resulting in PwH = 20 mW. 25 ° C
Overwriting was performed with Pw = 20 mW and Pe = 10 mW on the portion recorded in (4). When the 11T signal amplitude and jitter of the overwrite portion were measured, it was 67%, 24 ns
Met.

(Comparative Example 2) CD-RW recording device and C
Using the D-RW media, the power calibration operation was performed at a CD linear velocity of 4X (4.8 m / s) at a recording medium ambient temperature of 25 ° C. As a result, the recording laser power Pw = 17 mW and the erasing laser power Pe = 8.5 m
It became W. Then, the unrecorded portion was recorded once.
The 11T signal amplitude and jitter of the recorded portion were measured using an optical disc evaluation device, and were 65% and 18%, respectively.
It was ns. Then, the recording apparatus was placed in an oven with the recording medium installed and the temperature of the oven was set to 70 ° C. and left for 1 hour. The temperature around the recording medium was measured and found to be 72 ° C. Pw = 17mW, Pe in the part recorded at 25 ° C
= 8.5 mW, overwriting was performed. When the 11T signal amplitude and the jitter of the overwrite portion were measured, they were 56% and 30 ns.

[0018]

According to the first aspect of the invention, the temperature around the recording medium can be detected. According to the second aspect of the invention, it is possible to set the recording power and / or the erasing power corresponding to the ambient temperature of the phase change optical recording medium. In the invention of claim 3, the setting means sets the standard temperature range as a temperature range in which stable recording can be performed at the recording power and the erasing power determined at the standard temperature.
It is possible to prevent an unnecessary correction operation.

According to a fourth aspect of the present invention, when the detected temperature is lower than the set standard temperature range, the power adjusting means compares the erase power with the optimum erase power obtained by the power calibration operation. By increasing the value, the optimum erasing power can be obtained, and the increase in jitter at the time of overwriting can be prevented. According to the fifth aspect of the present invention, the erasing power is a function of the temperature obtained by the temperature detecting means and the erasing power obtained by the power calibration operation, whereby the optimum erasing power according to the temperature can be obtained. .

According to the sixth aspect of the present invention, when the detected temperature is higher than the set standard temperature range, the recording power is made larger than the optimum recording power obtained by the power calibration operation, and the optimum recording power is obtained. It is possible to obtain a high recording power and prevent a decrease in 11T signal amplitude. In the invention of claim 7, the recording power is
The optimum recording power corresponding to the temperature can be obtained by using the function of the detected temperature and the optimum recording power obtained by the power calibration operation. In the invention described in claim 8, the optimum recording power and / or erasing power can be determined in advance during the power calibration operation.

According to the ninth aspect of the present invention, when the detected temperature is lower than the set standard temperature range, the ratio Pe / the erasing laser power Pe and the recording laser power Pw is Pe /.
By making Pw larger than the value peculiar to the recording medium,
The optimum erase power can be determined in advance during the power calibration operation. According to the tenth aspect of the invention, when the detected temperature is lower than the standard temperature range, the correction coefficient ρ of the recording laser power is made larger than the value peculiar to the recording medium, so that it is optimized in advance during the power calibration operation. Recording power and / or erasing power can be determined. According to the invention of claim 11, when the detected temperature is higher than the set standard temperature range, the correction coefficient ρ of the recording laser power is made larger than the value peculiar to the recording medium to perform the power calibration operation. Sometimes the optimum recording power can be decided in advance.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a phase-change optical recording medium recording device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between temperature and jitter in a conventional phase change type optical recording medium recording device.

FIG. 3 is a diagram comparing the 11T signal amplitude when the temperature is higher than the standard temperature range with the 11T signal amplitude at the standard temperature.

FIG. 4 is a diagram comparing fluctuations in the 11T signal amplitude when the temperature is higher than the standard temperature range with fluctuations in the 11T signal amplitude at the standard temperature.

[Explanation of symbols]

10 Recording device 20 Phase change type optical recording medium 22 Temperature detection means 30 drive controller 32 interfaces

Claims (11)

[Claims] 1. A device comprising: a temperature detecting means for detecting a temperature around the recording medium in a state where the recording medium is housed in the apparatus; and a temperature notifying means for transmitting the temperature detected by the temperature detecting means to the apparatus. An optical disk recording device characterized by the above. 2. A temperature detecting means for detecting a temperature around the phase change type optical recording medium in a state where the phase change type optical recording medium is housed in the apparatus, and a temperature detecting means based on the temperature detected by the temperature detecting means. A phase-change type optical recording medium recording device comprising: a power adjusting unit that adjusts both or one of a recording power and an erasing power. 3. A setting means for setting a standard temperature range as a temperature range in which stable recording can be performed with the recording power and the erasing power determined at the standard temperature, and the temperature detected by the temperature detecting means is the setting. 3. The phase change type optical recording medium recording according to claim 2, wherein the power adjusting means adjusts the recording power and / or the erasing power when the temperature is out of the standard temperature range set by the means. apparatus. 4. When the temperature detected by the temperature detecting means is lower than the standard temperature range set by the setting means, the power adjusting means obtains the erasing power by an optimum power erasing operation. The phase change type optical recording medium recording device according to claim 3, wherein the power is made larger than the power. 5. The phase change optical recording medium recording apparatus according to claim 4, wherein the erasing power is a function of the temperature obtained by the temperature detecting means and the erasing power obtained by the power calibration operation. . 6. When the temperature detected by the temperature detecting means is higher than the standard temperature range set by the setting means, the recording power is made larger than the optimum recording power obtained by the power calibration operation. The phase change type optical recording medium recording device according to claim 3. 7. The phase-change optical recording medium according to claim 6, wherein the recording power is a function of the temperature detected by the temperature detecting means and the optimum recording power obtained by a power calibration operation. Recording device. 8. The phase-change type optical recording medium recording apparatus according to claim 2, further comprising a correction unit that corrects the temperature detected by the temperature detection unit during a power calibration operation. 9. When the temperature detected by the temperature detecting means is lower than the standard temperature range set by the setting means, the ratio Pe / Pw of the erasing laser power Pe and the recording laser power Pw is recorded medium specific. 9. The phase-change optical recording medium recording device according to claim 3, wherein the value is larger than the value of. 10. When the temperature detected by the temperature detecting means is lower than the standard temperature range set by the setting means, the correction coefficient ρ of the recording laser power is made larger than a value peculiar to the recording medium. 9. The phase change type optical recording medium recording device according to claim 3 or 8. 11. When the temperature detected by the temperature detecting means is higher than the standard temperature range set by the setting means, the correction coefficient ρ of the recording laser power is made larger than a value peculiar to the recording medium. 9. The phase change type optical recording medium recording device according to claim 3 or 8.