JPH11296885A - Recommended recording power display method in optical information recording medium, recommended optical information recording medium, optical information recording method and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently express the recording light wavelength dependency of recommended recording power, to effectively utilizing the few parameters, and to correct the recording power at a sufficiently practical level to some change of a recording light wavelength. SOLUTION: At least, values of λc, Po (λc), λp are provided as the parameter expressing the recommended recording power so that the recommended recording power in an optical information recording medium is obtained by Po(λ)=Po(λ)×(λ/λc)γp . The expression of Po (λ) contains only one of the parameter of the wavelength dependency, and the value of (λ) is 830 nm to 400 nm since it is visible rays regularly, and since the range of the wave-length that Po (λ) is defined is 5 nm to 50 nm, the wavelength dependency is shown efficiently by a remarkably few parameters, and even when a recording recommended value is provided with the wavelength dependency, the necessity that the value of Po is displayed beforehand at every wavelength is eliminated, and since the wavelength dependency can be covered with the three values, the display efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for displaying a recommended recording power on an optical information recording medium such as an optical disk,
The present invention relates to an optical information recording medium displaying recommended recording power, a method of recording optical information on an optical information recording medium displaying recommended recording power, and an optical information reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, as this kind of technology, for example,
As shown in JP-A-9-138946, information on recommended recording power is recorded on a part of an optical disk medium, and this information is read by an optical disk drive.
There are known methods of setting a recommended recording power based on this information, and further calibrating and finding an optimum recording power using the recommended recording power as a guide.

[0003]

However, CD-R
(Recordable Compact Disc) or DVD-R (Rec
In the dye-based disc used for the ordable DVD disc, even if the wavelength changes only by a few nm, the optimum recording power is largely shifted, that is, the wavelength dependence of the so-called optimum recording power is large. For this reason, there has been a problem that even if the recording wavelength is slightly changed, the actual optimum recording power cannot be accurately set only from the recommended recording power recorded on the optical disc. Further, in order to reflect the wavelength dependence of the optimum recording power, it is necessary to display the optimum recording power for each wavelength, and many parameters must be provided, which is not practical.

The present invention solves the above-mentioned drawbacks of the prior art, and efficiently expresses the dependence of the recommended recording power on the recording light wavelength with a small number of parameters. It is an object of the present invention to provide an optical information recording medium, a recording method, and a reproducing apparatus capable of calibrating a recording power at a practically sufficient level with respect to a change in the information.

[0005]

According to a first aspect of the present invention, there is provided a method for displaying a recommended recording power on an optical information recording medium, wherein the recommended recording power is expressed by the following equation: Po (λ) = Po (λc) * (λ) / Λc) ＾ γ _p where Po (λ): recommended recording power at wavelength λ, wavelength λ
Λ: represents a recording laser beam wavelength of a recording pickup head (PUH), and is defined in a predetermined range of 5 nm to 50 nm. Λc: represents one light wavelength in the range of the wavelength λ. Po (λc ): Represents the recommended recording power value at the wavelength λc. ＾: “＾” represents a power operation. Γ _p : represents the wavelength dependence of the recommended recording power Po. , λc, Po (λc), is obtained by comprising the value of gamma _p.

According to a second aspect of the present invention, in an optical information recording medium, a recommended recording power is expressed by the following equation: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p where Po (λ): The recommended recording power at wavelength λ
Λ: represents a recording laser beam wavelength of a recording pickup head (PUH), and is defined in a predetermined range of 5 nm to 50 nm. Λc: represents one light wavelength in the range of the wavelength λ. Po (λc ): Represents the recommended recording power value at the wavelength λc. ＾: “＾” represents a power operation. Γ _p : represents the wavelength dependence of the recommended recording power Po. , Λc, Po (λc), and γ _p values are recorded on a part of the optical information recording medium.

[0007] The invention of claim 3, than the optical information recording medium according to claim 2, as a parameter representing the recommended recording power, at least, [lambda] c, Po ([lambda] c), reads the value of gamma _p, based on the information And an optical information recording method for setting a recording power.

[0008] A fourth aspect of the present invention, from the optical information recording medium according to claim 2, as a parameter representing the recommended recording power, at least, [lambda] c, Po ([lambda] c), reads the value of gamma _p, based on the information And an optical information reproducing apparatus for setting a recording power.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION (Invention of claim 1) The invention of claim 1 is a method for displaying a recommended recording power on an optical information recording medium, wherein the recommended recording power is represented by the following formula: Po (λ) = Po ( λc) * (λ / λc) ＾ γ _p Here, Po (λ) represents a recommended recording power at the wavelength λ and a value depending on the wavelength λ: represents a recording laser light wavelength of the recording pickup head (PUH), Λc defined within a predetermined range of 5 nm to 50 nm: represents one light wavelength in the range of the wavelength λ Po (λc): represents a recommended recording power value at the wavelength λc ＾: “＾” represents a power operation γ _p : represents the wavelength dependency of the recommended recording power Po. As determined by, at least λc, Po (λc), γ _p
Is a recommended recording power display method for an optical information recording medium, characterized by having the following values:

The above Po (λ) equation obviously contains only one wavelength-dependent parameter, and the value of λ is
Since it is usually visible light, it has a value of 830 nm to 400 nm, and further, the wavelength range in which Po (λ) is defined is:
Since the wavelength is 5 nm to 50 nm, the wavelength dependency can be efficiently expressed with an extremely small number of parameters. Even if the recommended recording value has the wavelength dependency, the value of Po is displayed for each wavelength. Λc, Po (λc),
Since the three values of γ _p can be used, display efficiency is high.

According to a second aspect of the present invention, in an optical information recording medium, a recommended recording power is expressed by the following equation: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p And Po (λ): a recommended recording power at a wavelength λ, representing a value dependent on the wavelength λ. Λ: representing a recording laser beam wavelength of a recording pickup head (PUH), defined as a predetermined range of 5 nm to 50 nm. : Represents one optical wavelength within the range of the wavelength λ Po (λc): represents a recommended recording power value at the wavelength λc ＾: “＾” represents a power operation γ _p : represents the wavelength dependency of the recommended recording power Po. expressed as but determined, as a parameter representing the recommended recording power, at least, [lambda] c, Po ([lambda] c), the optical information recording gamma _p value is equal to or recorded in some of the optical information recording medium Medium .

Since the parameters indicating the recommended recording power including the wavelength dependency are efficiently recorded on the optical information recording medium, the information of the recording medium is not consumed excessively for recording these parameters. Also, since these parameters can be read by the optical information recording / reproducing device, even if the wavelength of the laser light source of the optical information recording / reproducing device is slightly different from the value of λc, it can be accurately determined based on the read information. It is possible to set an appropriate recording power.

According to a third aspect of the present invention, at least λc, Po (λ
c) An optical information recording / reproducing method characterized by reading the value of γ _p and setting the recording power based on the information.

The parameters λc and Po (λ) representing the recommended recording power recorded on the optical information recording medium according to claim 2.
c) Since the γ _p value can be read by the optical information recording / reproducing apparatus, even if the wavelength of the laser light source of the optical information recording / reproducing apparatus is slightly different from the value of λc, it can be accurately determined based on the read information. It is possible to set an appropriate recording power.

(Invention of claim 4) According to the invention of claim 4, from the optical information recording medium of claim 2, at least λc, Po (λ
c) An optical information recording apparatus which reads the value of γ _p and sets the recording power based on the information.

The parameters λc and Po (λ) representing the recommended recording power recorded on the optical information recording medium according to claim 2.
c) Since the value of γ _p can be read by the optical information recording / reproducing apparatus, even if the wavelength of the laser light source of the optical information recording / reproducing apparatus is slightly different from the value of λc, the value based on the read information can be obtained. Since accurate recording power setting is possible,
The reliability of the recording operation of the optical recording / reproducing apparatus having such a configuration can be improved.

Next, an embodiment of the present invention will be described. Po is a recommended recording power, and considering the dependence of the optical information recording apparatus on the recording light wavelength λ, the following equation is obtained: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p where Po ( λ): Represents a value that depends on the wavelength λ at the recommended recording power at the wavelength λ. λ: Represents the recording laser light wavelength of the recording pickup head (PUH), and is defined in the range of 630 nm to 655 nm as an example. Po (λc): represents one light wavelength within the range of wavelength λ: Po (λc): represents a recommended recording power value at the wavelength λc ＾: “＾” represents a power operation γ _p : represents wavelength dependence of the recommended recording power Po When applied, the value of the wavelength λ is from 630 nm to 655 n
In a narrow range of m, the value of γ _p can be approximated by the following equation, so that the value of γ _p can be easily obtained from the relationship between Po and λ as the slope of a log-log graph. γ _p = d {log (Po)} / d {log (λ)}

Po (λ ₁ ) and Po (λ ₂ ) are equal to λ ₁ (630
nm to 640 nm) and λ ₂ (645 to 655 nm)
, The value of γ _p is approximately given by the following equation, and can be easily obtained by a simple algebraic operation. γ _p = [{Po (λ ₂ ) −Po (λ ₁ )} / {Po (λ ₂ ) +
Po (λ ₁ )｝ * 2] / ｛(λ ₂ -λ ₁ ) / (λ ₂ + λ ₁ ) *
2｝, Abs (λ ₁ ) and Abs of light absorption of optical information recording medium
(Λ ₂ ) is λ ₁ (630 nm to 640 nm) and λ ₂ (6
45 nm-655 nm), and when Po (λ ₁ ) can be regarded as being proportional to 1 / Abs (λ), the value of γ _p is approximately given by the following equation. , Can be easily obtained by a simple algebraic operation. γ _p = [{Abs (λ ₁ ) −Abs (λ ₂ )} / {Abs (λ
₁ ) + Abs (λ ₂ )｝ * 2] / ｛(λ ₂ −λ ₁ ) / (λ ₂ +
λ ₁ ) * 2｝

Table 1 and FIG. 1 show the recommended recording power Po when the value γ _p of the wavelength dependence parameter ranges from 0 (when there is no wavelength dependence) to 30 (when the wavelength dependence is large). The following shows an example of the wavelength dependence of. Here, the value of Po is set to 10 mW when the wavelength is 635 nm.

[0020]

[Table 1]

[0021]

According to the first aspect of the present invention, there is provided a method for displaying a recommended recording power in an optical information recording medium, wherein the recommended recording power is represented by the following formula: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p Here, Po (λ): represents a recommended recording power at the wavelength λ and represents a value dependent on the wavelength λ. λ: represents a recording laser beam wavelength of the recording pickup head (PUH) and is defined in a predetermined range of 5 nm to 50 nm. Λc: represents one light wavelength within the range of the wavelength λ Po (λc): represents a recommended recording power value at the wavelength λc ＾: “＾” represents a power operation γ _p : wavelength of the recommended recording power Po Dependencies represent at least λc, Po (λc), γ _p
The Po is characterized in that
As is apparent from the equation (λ), only one wavelength-dependent parameter is included, and the value of λ is 830 nm to 400 nm because it is usually visible light. Is defined in the range of 5 nm to 50 nm, the wavelength dependence can be efficiently expressed with an extremely small number of parameters. Even if the recommended recording value has the wavelength dependence, there is no need to keep displaying the value of Po, λc, Po (λc) , more efficient display so can be covered by three values of gamma _p.

According to a second aspect of the present invention, in the optical information recording medium, a recommended recording power is expressed by the following equation: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p where Po (λ): The recommended recording power at the wavelength λ represents a value dependent on the wavelength λ. Λ: represents the recording laser beam wavelength of the recording pickup head (PUH) and is defined in a predetermined range of 5 nm to 50 nm. Λc: the range of the wavelength λ. Po (λc) representing one light wavelength: representing a recommended recording power value at the wavelength λc ＾: “＾” represents a power operation γ _p : representing the wavelength dependence of the recommended recording power Po, as a parameter representing the recommended recording power, at least, [lambda] c, Po ([lambda] c), in which gamma _p value is equal to or recorded in some of the optical information recording medium, the recommended recording including the wavelength dependence Power Since the parameters to be represented are efficiently recorded on the optical information recording medium, no extra information on the recording medium is consumed for recording these parameters, and these parameters are used for optical information recording / reproduction. Since the information can be read by the apparatus, even if the wavelength of the laser light source of the optical information recording / reproducing apparatus is slightly different from the value of λc, it is possible to set the recording power accurately based on the read information.

The invention of claim 3, than the optical information recording medium according to claim 2, as a parameter representing the recommended recording power, at least, [lambda] c, Po ([lambda] c), reads the value of gamma _p, based on the information In the optical information recording / reproducing method, wherein the recording power is set, parameters λc, Po (λc) and γ _p representing the recommended recording power recorded on the optical information recording medium according to claim 2 are: Since it can be read by the optical information recording / reproducing device, even if the wavelength of the laser light source of the optical information recording medium reproducing device is slightly different from the value of λc, accurate recording power can be set based on the read information. become.

[0024] A fourth aspect of the present invention, from the optical information recording medium according to claim 2, as a parameter representing the recommended recording power, at least, [lambda] c, Po ([lambda] c), reads the value of gamma _p, based on the information in the optical information recording apparatus which is characterized in that the setting of the recording power, parameter [lambda] c representing the recommended recording power recorded on the optical information recording medium according to claim 2, Po ([lambda] c), the value of gamma _p is Since it can be read by the optical information recording / reproducing device, even if the wavelength of the laser light source of the optical information recording medium reproducing device is slightly different from the value of λc, accurate recording power can be set based on the read information. Therefore, the reliability of the recording operation of the optical recording / reproducing apparatus having such a configuration can be improved.

[Brief description of the drawings]

FIG. 1 shows an example of the wavelength dependence of the recommended recording power Po when the value γ _p of the wavelength dependence parameter ranges from 0 (when there is no wavelength dependence) to 30 (when the wavelength dependence is large). It shows.

Claims (4)

[Claims] 1. A method of displaying a recommended recording power on an optical information recording medium, comprising the following formula: Recommended recording power: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p, where Po ( λ): recommended recording power at wavelength λ, wavelength λ
Λ: represents the wavelength of the recording laser beam of the recording pickup head, and is defined in a predetermined range of 5 nm to 50 nm. Λc: represents one light wavelength within the range of the wavelength λ. Po (λc): Represents a recommended recording power value at a wavelength λc: ＾ represents a power operation, and γ _p represents a wavelength dependence of the recommended recording power Po. Po ([lambda] c), recommended recording power display method in an optical information recording medium characterized by having a value of gamma _p. 2. In an optical information recording medium, a recommended recording power is expressed by the following equation: Po (λ) = Po (λc) * (λ / λc) ＾ γ _p where Po (λ): recommended recording at wavelength λ. Power, wavelength λ
Λ: represents the wavelength of the recording laser beam of the recording pickup head, and is defined in a predetermined range of 5 nm to 50 nm. Λc: represents one light wavelength within the range of the wavelength λ. Po (λc): Represents a recommended recording power value at the wavelength λc. ＾: “＾” represents a power operation. Γ _p : represents the wavelength dependence of the recommended recording power Po. As a parameter representing the recommended recording power, at least λc, An optical information recording medium characterized in that Po (λc) and γ _p values are recorded in a part of the optical information recording medium. 3. The optical information recording medium according to claim 2, wherein at least λ is a parameter indicating the recommended recording power.
c, Po ([lambda] c), reads the value of gamma _p, based on the information, the optical information recording method, which comprises carrying out the setting of the recording power. 4. The optical information recording medium according to claim 2, wherein at least λ
c, Po ([lambda] c), reads the value of gamma _p, based on the information, the optical information reproducing apparatus which is characterized in that the setting of the recording power.