JP5002573B2 - Information recording / reproducing apparatus and method for evaluating reproduction durability of optical disc - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily compute a new condition which can satisfy a fixed quality even if a recording type optical disk of a measuring object does not satisfy the reproduction durability of the fixed quality. <P>SOLUTION: An information recording and reproducing apparatus stores determination information which associates the optimal recording power and the optimal reproducing power for having the reproduction durability of a prescribed frequency over a plurality of linear speeds, and the apparatus compares the optimal recording power of a first detected linear speed with the optimal recording power of a first linear speed obtained from the stored determination information. When the optimal recording power is determined not having the reproduction durability of the prescribed frequency, the apparatus computes the optimal reproducing power having the reproduction durability of the prescribed frequency in the first line speed by the predetermined method, creates a new determination information based on a linear relationship of the computed optimal reproducing power and the stored determination information, and obtains the optimal reproducing power corresponding to the optimal recording power of the second detected linear speed by referring to the created determination information. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a technique for evaluating durability against repeated reproduction of an optical disc.

  In an optical disc such as a DVD (Digital Versatile Disc) and a BD (Blu-ray Disc), there is a demand for reproduction durability so that reproduction can be performed with a certain quality no matter how many times the reproduction is performed. , It is stipulated that the reproduction characteristics do not deteriorate even after one million reproductions.

  However, in order to evaluate the reproduction durability of the optical disc, when the reproduction is actually performed about 1 million times, it is necessary to continuously irradiate the laser power for several hours at the minimum.

  In this regard, in the method for evaluating the reproduction durability of an optical disk disclosed in Patent Document 1, the number of reproductions that maintain a constant quality with at least two types of reproduction powers that are higher than the normal reproduction power used in the drive is measured and measured. A technique for obtaining reproduction durability at normal reproduction power by applying Arrhenius' law to the result is disclosed.

  If this method is used, it can be determined in a short time whether or not the optical disc to be measured satisfies a predetermined constant quality (for example, reproduction characteristics do not deteriorate even after one million playbacks).

JP 2007-293976 A

  By the way, in the method shown in Patent Document 1 described above, even when the optical disc to be measured does not satisfy a predetermined quality, if the optical disc is a recordable disc, the reproduction speed for reproducing information It is possible to satisfy a predetermined quality by increasing the playback power when reproducing information. That is, even when the optical disc to be measured does not satisfy a predetermined quality, a suitable recording speed and recording power are separately selected, information is recorded, and this recorded information is suitably reproduced. If reproduction is performed by selecting the speed and reproduction power, it is possible to satisfy the certain quality.

  The present invention has been made in view of the above circumstances, and as an example of the problem, it can be determined in a short time whether or not the recording type optical disc to be measured has a certain quality of reproduction durability, Provided is an information recording / reproducing apparatus and an optical disk reproduction durability evaluation method capable of easily calculating a new condition that can satisfy a certain quality even if the target recording optical disk does not satisfy the certain quality There is to do.

  In order to achieve the above object, an information recording / reproducing apparatus according to claim 1 is an information recording / reproducing apparatus for recording information on an optical disk or reproducing information from an optical disk by emitting laser light to the optical disk. A determination information storage means for storing reproduction durability determination information in which the optimum recording power and the optimum reproduction power of the laser beam for having a predetermined specified number of times of reproduction durability are associated over a plurality of linear velocities. A first optimum recording power detecting means for detecting an optimum recording power at the first linear velocity of the optical disc to be measured, and the determination information storage means, and an optimum recording power at the first linear velocity and First determination information acquisition means for acquiring optimum reproduction power, optimal recording power detected by the first optimum recording power detection means, and first determination information acquisition means The optimum recording power at the first linear velocity acquired in step 1 is compared, information is recorded at the first linear velocity and the optimum recording power detected by the first optimum recording power detection means, and the recorded information is recorded. A reproduction durability judging means for judging whether or not the reproduction durability is the specified number of times when the reproduction is performed with the first linear velocity and the optimum reproduction power obtained by the first judgment information obtaining means; and the reproduction durability When it is determined by the sex determining means that the prescribed number of reproduction durability is not obtained, the optimum reproduction power having the prescribed number of reproduction durability at the first linear velocity is calculated by a predetermined method, Based on the linear relationship between the calculated optimum playback power and the playback durability judgment information stored in the judgment information storage means, judgment information creating means for creating new playback durability judgment information, and the measurement Second optimum recording power detection means for detecting optimum recording power at a second linear velocity larger than the first linear velocity of the target optical disc, and new reproduction durability judgment information created by the judgment information creation means Referring to the second determination information acquisition means for acquiring the optimum reproduction power corresponding to the optimum recording power detected by the second optimum recording power detection means, and the reproduction durability of the specified number of times in the optical disc to be measured. The information is recorded at the second linear velocity and the optimum recording power detected by the second optimum recording power detection means, and the recorded information is recorded at the second linear velocity and the second determination information. And a new reproduction condition calculation means for calculating that the reproduction is performed with the optimum reproduction power acquired by the acquisition means.

  An information recording / reproducing apparatus according to claim 2 is an information recording / reproducing apparatus for recording information on an optical disk or reproducing information from the optical disk by emitting a laser beam to the optical disk. And a judgment information storage means for storing reproduction durability judgment information in which the optimum recording power and the optimum reproduction power of the laser light for having a predetermined prescribed number of reproduction durability are associated with each other over a plurality of linear velocities. The optimum recording power at the first linear velocity with reference to the first optimum recording power detection means for detecting the optimum recording power at the first linear velocity of the optical disc to be measured and the judgment information storage means. And first determination information acquisition means for acquiring the optimum reproduction power, optimum recording power detected by the first optimum recording power detection means, and the first determination information. The optimum recording power at the first linear velocity obtained by the obtaining unit is compared, and information is recorded and recorded at the first linear velocity and the optimum recording power detected by the first optimum recording power detecting unit. When the information is reproduced at the first linear velocity and the optimum reproduction power acquired by the first determination information acquisition unit, the reproduction durability determination unit that determines whether or not the specified number of reproduction durability is obtained; When the reproduction durability determining means determines that the specified number of times of reproduction durability is not obtained, the optimum reproduction power having the specified number of times of reproduction durability at the first linear velocity is determined by a predetermined method. Judgment information creation means for creating new reproduction durability judgment information based on a linear relationship between the calculated optimum reproduction power and the reproduction durability judgment information stored in the judgment information storage means A new optimum recording power detecting means for detecting an optimum recording power at a second linear velocity higher than the first linear velocity of the optical disc to be measured, and a new reproduction durability created by the judgment information creating means. Referring to the judgment information, second judgment information acquisition means for acquiring the optimum reproduction power corresponding to the optimum recording power detected by the second optimum recording power detection means, and the prescribed number of times in the measurement target optical disc The condition having the reproduction durability is that information is recorded at the second linear velocity and the optimum recording power detected by the second optimum recording power detecting means, and the recorded information is recorded at the second linear velocity and the second linear velocity. And a new reproduction condition calculation unit that calculates that the reproduction is performed with the optimum reproduction power acquired by the determination information acquisition unit.

  According to another aspect of the present invention, there is provided an information recording / reproducing apparatus for recording information on or reproducing information from an optical disk by emitting laser light onto the optical disk. A method for evaluating durability, which is information for determining the durability of reproduction in which the optimum recording power and the optimum reproduction power of the laser beam are associated with each other over a plurality of linear velocities so as to have a predetermined number of times of reproduction durability. A first optimum recording power detection step for detecting an optimum recording power value at a first linear velocity of the optical disc to be measured in a state in which the information recording / reproducing apparatus or the optical disc is provided with a judgment information storage means for storing First determination information for obtaining the optimum recording power and optimum reproduction power at the first linear velocity with reference to the judgment information storage means Comparing the optimum recording power detected in the obtaining step and the first optimum recording power detection step with the optimum recording power at the first linear velocity obtained in the first determination information obtaining step. The information is recorded at the linear velocity and the optimum recording power detected in the first optimum recording power detection step, and the recorded information is obtained at the first linear velocity and the optimum judgment power obtaining step. When the reproduction durability is determined not to have the prescribed number of reproduction durability by the reproduction durability judgment step and the reproduction durability judgment step for judging whether or not the reproduction durability is the prescribed number of times. Calculates the optimum reproduction power having the specified number of times of reproduction durability at the first linear velocity by a predetermined method, A determination information generating step for generating new reproduction durability determination information based on the linear relationship of the reproduction durability determination information stored in the determination information storage means; and a larger than the first linear velocity of the optical disc to be measured The second optimum recording power detection with reference to the second optimum recording power detection step for detecting the optimum recording power at the second linear velocity and the new reproduction durability judgment information created in the judgment information creation step. The second determination information acquisition step for acquiring the optimum reproduction power corresponding to the optimum recording power detected by the means, and the condition having the reproduction durability of the specified number of times with respect to the optical disc to be measured are the second line Information is recorded at the speed and the optimum recording power detected by the second optimum recording power detection step, and the recorded information is recorded as the second linear velocity and the second judgment information. And a new reproduction condition calculating step for calculating that the reproduction is performed with the optimum reproduction power acquired by the information acquisition means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Basic concept>
Before describing the information recording / reproducing apparatus 1 and the optical disk reproduction durability evaluation method according to the embodiment of the present invention, first, it is determined whether or not the optical disk 2 to be measured has a predetermined predetermined number of reproduction durability. Explain the basic way of thinking.

  Figure 1 shows the maximum rating values described in the BDR (Blu-ray Disc Recordable) standard (Blu-ray Disc, System Description Blu-ray Disc Recordable Format, Part 1, Basic Format Specifications, Version 1.30 Final Draft) It is the table | surface and graph which this inventor created based on these. Specifically, FIG. 1A is a table showing the relationship between the optimum recording power and the optimum reproducing power for providing the reproduction durability of 1 million times of reproduction, and the optimum for each linear velocity (recording speed and reproducing speed). A combination of recording power and optimum reproduction power is shown. For example, the data of the first line of SL (single-sided single layer) is the data recorded at the recording speed of 1 × (1 ×) at the optimum recording power of 6 mW at the recording speed and the playback speed at the playback speed of 1 × (1 ×). It is shown that when the playback is performed at the optimum playback power of 0.4 mW, the playback characteristics are not deteriorated even after playback of 1 million times. Similarly, for example, data in the third row of DL (single-sided double layer) is data recorded at an optimum recording power of 18 mW at the recording speed at a quadruple speed (4X). That is, when the playback is performed with the optimum playback power of 1.3 mW at the playback speed, the playback characteristics are not deteriorated even if the playback is performed 1 million times.

  FIG. 1B is a graph of the table of FIG. 1A, with the horizontal axis representing optimum reproduction power (mW) and the vertical axis representing optimum recording power (mW). FIG. 1B shows a linear relationship between the optimum reproduction power and the optimum recording power. When the linear velocity (recording velocity, reproduction velocity) is increased, optimum recording for providing a reproduction durability of 1 million reproduction times is shown. It shows that the power and the optimum reproduction power are increased. That is, in the present embodiment, the points on the straight line L1 and the straight line L2 shown in FIG. 1B indicate the combination of the optimum recording power and the optimum reproducing power having a reproduction durability of 1,000,000 times. As the speed is increased, the optimum recording power and optimum reproduction power are also increased. As will be described in detail later, in the present embodiment, the data of the combination of the optimum recording power and the optimum reproduction power having a reproduction durability of a predetermined number of times (for example, 1 million times) is shown in FIG. ), The reproduction durability of the optical disk is evaluated using the linear (proportional) relationship with the linear velocity as a parameter.

  Here, in the optical disk reproduction durability evaluation method according to the present embodiment, whether or not the optical disk 2 to be measured has a certain quality reproduction durability (for example, a reproduction durability of 1 million reproduction times). A method for determining the above will be specifically described. In the present embodiment, the information shown in FIG. 1, that is, the information indicating the linear relationship between the optimum reproduction power and the optimum recording power having the reproduction durability of the predetermined number of times (hereinafter referred to as reproduction durability judgment information). It is assumed that the information recording / reproducing apparatus 1 to which the optical disk 2 is mounted is stored in advance. That is, the information recording / reproducing apparatus 1 is provided with an information table (hereinafter referred to as a determination information table) TA in which determination information is stored in the memory.

  First, the optimum recording power WP1 for recording at a predetermined linear velocity (for example, 1 × speed) on the optical disc 2 to be measured is determined. Specifically, the power calibration is performed on the optical disc 2 to be measured on which the information recording / reproducing apparatus 1 is mounted, and test recording is performed in the PCA area (power calibration area). The optimum recording power WP1 is determined. Note that the optimum recording power WP1 may be determined by another method. For example, when the optimum recording power for each linear velocity is recorded in the disc information area of the optical disc 2, the optimum recording power WP1 is set using the optimum recording power recorded in the disc information area of the optical disc 2. You may decide.

  In the present embodiment, the optimum recording power determined by the information recording / reproducing apparatus 1 by performing power calibration or the like is denoted as WP. For example, the optimum recording power when recording at a recording speed of 1 × speed is denoted by WP1. Is written.

  Next, the optimum recording power WP1 at the determined predetermined linear velocity (for example, 1 × speed) is compared with the optimum recording power WP1 (TA) at the predetermined linear velocity (for example, 1 × speed) stored in the determination information table TA. When optimum recording power WP1 = optimal recording power WP1 (TA), it is determined that the optical disk to be measured has a predetermined number of times of reproduction durability.

  In the present embodiment, the optimum recording power acquired by the information recording / reproducing apparatus 1 from the judgment information table TA is expressed as WP (TA). For example, the optimum recording power when recording at a recording speed of 1 × speed is WP1. Indicated as (TA).

  For example, specifically, when the information recording / reproducing apparatus 1 includes the determination information table TA shown in FIG. 1 and the optimum recording power WP1 at 1 × speed of the optical disc 2 (BD SL) to be measured is 6 mW, Since the optimum recording power WP1 (TA) at the 1 × speed of SL stored in the determination information table TA is 6 mW, the optical disc 2 to be measured records information at a recording speed of 1 × speed and an optimum recording power of 6 mW. When this information is reproduced at a reproduction speed of 1 × speed and an optimum reproduction power RP1 (TA) of 0.4 mW at a reproduction speed of 1 × speed, it is determined that the reproduction durability is 1 million times (FIG. 1 (c)). (See P1 of)).

  In the present embodiment, the optimum reproduction power at a predetermined linear velocity acquired from the determination information table TA by the information recording / reproducing apparatus 1 is expressed as RP (TA), and for example, reproduction is performed at a reproduction speed of 1 × speed. Is expressed as RP1 (TA).

  On the other hand, when the optimum recording power WP1> optimal recording power WP1 (TA), it is determined that the optical disc 2 to be measured has a reproduction durability equal to or more than a predetermined number of times. That the optimum recording power WP1 detected by performing power calibration or the like is larger than the optimum recording power WP1 (TA) recorded in the information table TA means that the optical disc 2 to be measured is a standard recorded in the information table TA. This is because a recording domain is created by irradiation with a laser beam (for example, recording is performed by melting the recording layer or changing a refractive index), and the sensitivity of the recording layer is considered to be lower than that of the optical disc 2.

  For example, specifically, if the information recording / reproducing apparatus 1 includes the determination information table TA shown in FIG. 1 and the optimum recording power WP1 at 1 × speed of the optical disk (SL) to be measured is 7 mW, the determination information table Since the optimum recording power WP1 (TA) at 1 × speed of SL described in TA is 6 mW, the optical disc 2 to be measured records information at a recording speed of 1 × speed and an optimum recording power of 7 mW. Is reproduced at a reproduction speed of 1 × speed and an optimum reproduction power RP1 (TA) of 0.4 mW at a reproduction speed of 1 × speed, it is determined that the reproduction durability exceeds 1 million times (see FIG. 1C). P2).

  On the other hand, when the optimum recording power WP1 <optimal recording power WP1 (TA), it is determined that the optical disk 2 to be measured has a reproduction durability less than a predetermined number of times. The fact that the optimum recording power WP1 detected by performing power calibration or the like is smaller than the optimum recording power WP1 (TA) recorded in the information table TA means that the optical disk 2 to be measured is a standard recorded in the information table TA. This is because it is considered that the sensitivity of the recording layer is better than that of the optical disc 2 because the recording domain is created by laser beam irradiation (for example, recording is performed by melting the recording layer or changing the refractive index).

  For example, specifically, if the information recording / reproducing apparatus 1 includes the determination information table TA shown in FIG. 1 and the optimum recording power WP1 at 1 × speed of the optical disk 2 (BD SL) to be measured is 5 mW, Since the optimum recording power WP1 (TA) at 1 × speed of SL in the determination information table TA is 6 mW, the optical disc 2 to be measured records information at the recording speed of 1 × speed and the optimum recording power of 5 mW. Is reproduced at a reproduction speed of 1 × speed and an optimum reproduction power RP1 (TA) of 0.4 mW at a reproduction speed of 1 × speed, it is determined that the reproduction durability is less than 1 million times (see FIG. 1C). (See P3).

  As described above, the optical disk reproduction durability evaluation method according to the present embodiment is a measurement target optical disk in the case where information is reproduced with a predetermined linear velocity and a reproduction power RP (TA) optimum for the predetermined linear velocity. It is possible to determine whether or not the reproduction durability is equal to or more than a predetermined number of times by simply detecting the value of the optimum recording power WP1 when recording at a predetermined linear velocity from 2. In other words, in the graph shown in FIG. 1C, if the reproduction speed and the reproduction power are the same, the straight line L1 (L2) that satisfies the predetermined number of times of reproduction durability or the straight line L1 (L2). The upper region point satisfies the predetermined number of times of reproduction durability, but the region point below the straight line L1 (L2) indicates that the predetermined number of times of reproduction durability is not satisfied. ing.

  Therefore, the optical disk reproduction durability evaluation method according to the present embodiment uses the judgment information table TA to easily determine whether or not the optical disk 2 to be measured has a reproduction durability of a predetermined number of times or more. It can be judged in a short time.

  FIG. 2 is a table and a graph based on our experiments. FIG. 2A is a table showing the relationship between the optimum recording power and the optimum reproducing power for providing the reproduction durability of 1 million times of reproduction, and the optimum recording power for each linear velocity (recording speed and reproducing speed). The optimum reproduction power combination is shown. FIG. 2B is a graph of the table of FIG. 2A, with the horizontal axis representing optimum reproduction power (mW) and the vertical axis representing optimum recording power (mW). FIG. 2B shows the linear relationship between the optimum reproduction power and the optimum recording power. Also in this experiment, when the linear velocity (recording velocity, reproduction velocity) is increased, the reproduction durability of one million reproduction times is obtained. It shows that the optimum recording power and the optimum reproduction power for preparing each increase. Since the values shown in FIG. 2 are measured values unlike FIG. 1, in DL (single-sided two layers), the optimum recording power of L0 (first layer: back side) and L1 (second layer: front side) The optimum recording power on the side is different. Also, in this experiment, the quality with a reproduction durability of 1,000,000 times was measured with the jitter value degradation within + 0.5%, but the characteristic value for measuring the reproduction durability is limited to the jitter characteristic. Of course, measurement may be performed using error rate characteristics, reflectance characteristics, servo signal characteristics, and the like.

<Configuration of optical disc recording / reproducing apparatus>
FIG. 3 is a diagram showing a schematic configuration of the information recording / reproducing apparatus 1 according to the embodiment of the present invention. The information recording / reproducing apparatus 1 is an optical disk recording / reproducing apparatus capable of recording information on the optical disk 2 and reproducing information recorded on the optical disk 2, and the reproduction durability of the loaded optical disk 2. It has a playback durability evaluation function. The optical disc 2 in the present embodiment will be described by taking a recording type (including both write-once type and rewritable type) BD (Blu-ray Disc) as a preferred example, but is not limited thereto. Instead, any recordable optical disc may be used. For example, it may be a DVD (Digital Versatile Disc), a CD (Compact Disc), or an HD DVD (High-Definition Digital Versatile Disc). Further, the optical disk 2 includes a multi-layer disk and the like that are being developed with an increase in capacity of the optical disk in the future.

  As schematically shown in FIG. 3, the information recording / reproducing apparatus 1 includes a spindle motor 11, an optical pickup 12, a signal amplifier circuit 13, a servo circuit 14, a laser drive circuit 15, and a control unit 16.

  The spindle motor 11 is a motor that rotates the optical disc 2 at a predetermined rotational speed.

  The optical pickup 12 records data on the optical disk 2 by irradiating the optical disk 2 with laser light, and reads data recorded on the optical disk 2 by receiving reflected light of the laser light. In addition, an RF signal corresponding to the reflected light of the laser beam is output to the signal amplifier circuit 13. Specifically, the optical pickup 12 includes a semiconductor laser 17 and a photodetector 18 and writes / reads data to / from the optical disc 2 by converging the laser beam on the optical disc 2. Although not shown, the optical pickup 12 guides the objective lens actuator for adjusting the irradiation state of the laser beam to the optical disc 2 and the laser beam emitted from the semiconductor laser 17 to the objective lens, and from the optical disc 2. An optical system for guiding the reflected light to the photodetector 18 is provided.

  The signal amplification circuit 13 amplifies and calculates the RF signal output from the photodetector 18 of the optical pickup 12 to generate various signals (wobble signal, track error signal, and focus error signal), and the servo circuit 14. To output.

  The servo circuit 14 controls the driving of the optical pickup 12 and the spindle motor 11 on the basis of various signals input from the signal amplifier circuit 13. Specifically, the servo circuit 14 generates a focus servo signal and a tracking servo signal from the focus error signal and tracking error signal input from the signal amplifier circuit 13 and outputs them to the objective lens actuator of the optical pickup 12. ing. The servo circuit 14 generates a motor servo signal from the wobble signal input from the signal amplification circuit 13 and outputs the motor servo signal to the spindle motor 11.

  The laser driving circuit 15 generates a laser beam driving signal corresponding to data recording, erasing and reproduction of the optical disc 2. Specifically, a drive signal corresponding to the recording signal is output to the semiconductor laser 17 at the time of data recording, and a drive signal for emitting a laser beam having a constant intensity is output to the semiconductor laser 17 at the time of data reproduction. ing.

  The controller 16 controls the entire information recording / reproducing apparatus 1. Specifically, the control unit 16 includes a CPU, a memory (ROM, RAM), and the like, stores various data and programs in the memory, and controls each unit of the information recording / reproducing apparatus 1 according to a preset program. It is supposed to be. For example, in the present embodiment, the control unit 16 executes a reproduction durability evaluation process for evaluating the reproduction durability of the mounted optical disk 2.

  Next, the reproduction durability evaluation function of the control unit 16 will be described in detail with reference to FIGS. Here, FIG. 4 is a functional configuration diagram of the control unit 16, and FIGS. 5 and 6 are graphs for specifically explaining the method for evaluating the reproduction durability of the optical disc.

  As shown in FIG. 4, the control unit 16 according to the present embodiment includes a reproduction durability determination information storage unit 161, a first optimum recording power detection unit 162, a first optimum recording power / optimum reproduction power acquisition unit 163, a reproduction The configuration includes a durability determination unit 164, a reproduction durability determination information creation unit 165, a second optimum recording power detection unit 166, a second optimum reproduction power acquisition unit 167, and a new reproduction condition calculation unit 168.

  Specifically, the reproduction durability determination information storage unit 161 is the above-described determination information table TA, and stores reproduction durability determination information (determination information) as illustrated in FIGS. 1 and 2. Specifically, the determination information table TA linearly stores a combination of the optimum recording power and the optimum reproduction power having a predetermined number of reproduction durabilitys for each type (SL, DL) of the optical disc 2 and for each linear velocity. Yes.

  In the following description of the control unit 16, the control unit 16 is specifically described as including a determination information table TA having a linear relationship as shown in FIG. That is, in the determination information table TA, for example, at a linear velocity of 1X, the optimum recording power having a reproduction durability of 1 million times is 6 mW, the optimum reproducing power is 0.4 mW, and at a linear velocity of 4X, 1 million times. It is assumed that the optimum recording power having the reproduction durability is 10.5 mW and the optimum reproduction power is 0.7 mW.

  The first optimum recording power detection unit 162 detects the optimum recording power WP1 at the first linear velocity (initial value; 1 × velocity in the present embodiment) of the optical disc 2 to be measured. Specifically, the optimum recording power WP at the first linear velocity is obtained by performing power calibration on the optical disc 2 to be measured or using the optimum recording power recorded in the disc information area of the optical disc 2. To decide.

  The first optimum recording power / optimum reproduction power acquisition unit 163 refers to the determination information table TA, and combines the optimum recording power WP1 (TA) and optimum reproduction power RP1 (TA) at the first linear velocity (1 × speed). To get to.

  For example, as shown in FIG. 5A, the first optimum recording power / optimum reproduction power acquisition unit 163 has an optimum recording power WP1 (TA) 6 mW at the first linear velocity (recording velocity 1 ×), the first The optimum reproduction power RP1 (TA) 0.4 mW at the linear velocity (reproduction velocity 1 ×) is acquired (see point P1 in FIG. 5A).

  The reproduction durability judgment unit 164 includes the optimum recording power WP1 at the first linear velocity (1 × speed) detected by the first optimum recording power detection unit 162 for the optical disc 2 to be measured, and the first optimum recording power / optimum. The optimum recording power WP1 (TA) at the first linear velocity (1 × speed) acquired by the reproduction power acquisition unit 163 is compared, and information is recorded at the first linear velocity and the optimum recording power WP1 at the first linear velocity. The reproduction endurance is determined a predetermined number of times when the recorded information is reproduced at the optimum reproduction power RP1 (TA) at the first linear velocity and the first linear velocity. When the optimum recording power WP1 ≧ optimal recording power WP1 (TA), it is determined that the optical disc 2 to be measured has a predetermined specified number of times of reproduction durability, and the optimum recording power WP1 <optimal recording power WP1 (TA ), It is determined that the optical disc 2 to be measured does not have a predetermined specified number of playback durability.

  For example, when the first optimum recording power detector 162 detects 4 mW as the optimum recording power WP1 at the first linear velocity (1 × speed), the optimum recording power WP1 [4 mW] <optimal recording power WP1 ( TA) [6 mW], so that the reproduction durability is 1 million times when the reproduction is performed at 0.4 mW of the optimum reproduction power RP1 (TA) at the first linear velocity (1 × speed) and the first linear velocity (1 × velocity). It is determined that there is no property (see point P2 in FIG. 5B).

  When the reproduction durability determination unit 164 determines that the reproduction durability determination unit 164 does not have a predetermined predetermined number of reproduction durabilitys with respect to the measurement target optical disc 2, the reproduction durability determination information creation unit 165 For this, new reproduction durability judgment information (judgment information) is created.

  Specifically, the reproduction durability determination information creating unit 165 records the first line on the optical disc 2 to be measured at the first linear velocity and the optimum recording power WP1 at the first linear velocity. An optimum reproduction power calculation unit 171 for calculating an optimum reproduction power RP1 (AL) having a predetermined number of times of reproduction durability determined in advance by an accelerated deterioration test according to Arrhenius' law, and an optimum reproduction power calculation unit 171 And a linear relationship creating unit 172 that creates a new linear relationship between the optimum playback power and the optimum recording power based on the calculated optimum playback power RP1 (AL).

  In the present embodiment, when information is recorded with the optimum recording power WP1 at the first linear velocity and the first linear velocity calculated by the accelerated deterioration test according to the Arrhenius law, the first line An optimum reproduction power that has a predetermined number of times of reproduction durability in speed is denoted as optimum reproduction power RP1 (AL).

  For example, the optimum reproduction power calculation unit 171 has a reproduction durability of 1,000,000 times when reproducing information recorded at 4 mW of the optimum recording power WP1 at 1 × speed and at the 1 × speed reproduction speed at 1 × speed. When the reproduction power is calculated to be 0.2 mW based on Arrhenius' law, the optimum reproduction power RP1 (AL) is set to 0.2 mW (see point P3 in FIG. 5B). In addition, the accelerated deterioration test according to Arrhenius' law is, specifically, a characteristic corresponding to a reproduction durability of 1 million times with at least two kinds of reproduction power (reproduction power larger than 0.4 mW). When the number of playbacks that keep the rate of change of the value (for example, jitter value degradation is within 0.5%) is measured, and Arrhenius' law is applied to each measured result, the number of playbacks is 1 million The optimum reproduction power is obtained.

  Next, the linear relationship creating unit 172 has a determination information table TB that is a new linear relationship between the optimum recording power and the optimum reproduction power for providing the reproduction durability of 1 million times of reproduction with respect to the optical disc 2 being measured. Create Specifically, as shown in FIGS. 5B and 6A, a straight line L ′ parallel to the straight line L passes through a point P3 of the combination of the optimum recording power 4 mW and the optimum reproduction power 0.2 mW. Pull. As a result, the point on the straight line L ′ is the optimum recording power WP ′ (TA) and the optimum recording power WP ′ (TA) having a reproduction durability of 1 million times on the optical disc 2 being measured using the linear velocity (recording velocity and reproduction velocity) as a parameter. The combination of the reproduction power RP ′ (TA) will be shown.

  The reason why the straight line L ′ is made parallel to the straight line L is that the physical characteristics of the optical disc 2 of the same type are the same, and therefore, in the combination of the optimum recording power and the optimum reproducing power having a reproduction durability of 1 million times. This is because the rate of change (slope) of the optimum recording power with respect to the optimum reproduction power is considered to be the same.

  As described above, the reproduction durability judgment information creation unit 165 is optimal even when the optical disc 2 to be measured does not have the reproduction durability of 1 million times of reproduction at the optimum reproduction speed RP1 (TA) of 1 × speed. By using the linear relationship between the reproduction power RP1 (AL) and the determination information table TA, new conditions (linear speed, reproduction power) for providing reproduction durability of 1 million reproduction times can be easily obtained.

  The second optimum recording power detection unit 166 determines that the reproduction durability determination unit 164 determines that the measurement target optical disc 2 does not have a predetermined predetermined number of reproduction durabilitys with respect to the measurement target optical disc 2. The optimum recording power WP2 at the second linear velocity (linear velocity larger than the first linear velocity) is detected. Specifically, similarly to the first optimum recording power detector 162, power calibration is performed on the optical disc 2 to be measured, or the optimum recording power recorded in the disc information area of the optical disc 2 is used. The optimum recording power WP2 at the second linear velocity is determined.

  Note that the second linear velocity is set to a value larger than the first linear velocity, although it is possible to calculate new conditions even if the linear velocity is reduced, but when the linear velocity is reduced This is because the reproduction power is also reduced, and the CNR (carrier to noise ratio) is lowered due to the influence of laser noise. Therefore, in the present embodiment, the second linear velocity is set to a double velocity, a quadruple velocity, etc., which have a linear velocity larger than the initial value of the single velocity.

  The second optimum reproduction power acquisition unit 167 sets the optimum recording power WP2 detected by the second optimum recording power detection unit 166 to WP2 (TB), refers to the determination information table TB, and obtains the optimum at the second linear velocity. The optimum reproduction power RP2 (TB) corresponding to the recording power WP2 (TB) is acquired.

  For example, when the second optimum recording power detection unit 166 selects 4 × speed as the recording speed and detects 10 mW as the optimum recording power WP2 at 4 × speed, the second optimum reproduction power acquisition unit 167 As shown in FIG. 6B, the optimum reproduction power RP2 (TB) at the second linear velocity (reproduction speed 4 ×) corresponding to the optimum recording power WP2 (TB) 10 mW at the second linear velocity (recording velocity 4 ×). ) 0.6 mW is acquired (see point P4 in FIG. 6B).

  The new reproduction condition calculation unit 168 has the optimum recording power WP2 at the second linear velocity (recording velocity) detected by the second optimum recording power detection unit 166, and the second optimum reproduction power acquisition unit 167 obtains from the determination information table TA. Based on the result of the optimum reproduction power WP2 (TA) at the second linear velocity (reproduction velocity), information was recorded at the optimum recording power WP2 at the second linear velocity and the second linear velocity, and the recorded information Is reproduced at the optimum reproduction power WP2 (TB) at the second linear velocity and the second linear velocity, it is determined that the optical disc 2 to be measured has a prescribed number of reproduction durabilitys.

  For example, as shown in FIG. 6B, the second optimum reproduction power acquisition unit 167 uses the second linear velocity corresponding to the optimum recording power WP2 (TA) 10 mW at the second linear velocity (recording speed 4 ×). When the optimum reproduction power RP2 (TA) 0.6 mW at (reproduction speed 4 × speed) is acquired, the new reproduction condition calculation unit 168 has the condition that the optical disc 2 being measured has a reproduction durability of 1 million times: The new playback condition is that information is recorded at 10 mW of the optimum recording power WP2 at 4 × speed and 4 × speed, and the recorded information is reproduced at 0.6 mW of the optimum playback power WP2 (TA) at 4 × speed and 4 × speed. Calculate as

<Reproduction durability evaluation process>
Next, a reproduction durability evaluation process of the information recording / reproducing apparatus 1 will be described with reference to FIGS. FIG. 7 is a flowchart showing the flow of the reproduction durability evaluation process of the information recording / reproducing apparatus 1, and FIG. 8 is a flowchart showing in detail the process of step S70 of FIG.

  First, the information recording / reproducing apparatus 1 uses the first optimum recording power detection unit 162 to detect the optimum recording power WP1 at the first linear velocity (1 × speed) with respect to the mounted optical disc 2 to be measured (step 1). S10).

  Next, the information recording / reproducing apparatus 1 refers to the determination information table TA by the first optimum recording power / optimum reproducing power acquisition unit 163, and optimum recording power WP1 (TA) at the first linear velocity (1 × speed). And the optimum reproduction power RP1 (TA) is acquired (step S20).

  Next, the information recording / reproducing apparatus 1 compares the optimum recording power WP1 and the optimum recording power WP1 (TA) by the reproduction durability judgment unit 164 (step S30).

  When the optimum recording power WP1 ≧ the optimum recording power WP1 (TA) (step S40: YES), the reproduction durability judgment unit 164 records information at the first linear velocity and the optimum recording power WP1 at the first linear velocity. When the recorded information is reproduced at the first linear velocity and the optimum reproduction power RP1 (TA) at the first linear velocity, the optical disc 2 to be measured has a reproduction durability of a predetermined number of times. Then, it is determined (step S50).

  On the other hand, when the optimum recording power WP1 <optimal recording power WP1 (TA) (step S40: NO), the reproduction durability judgment unit 164 performs information with the optimum recording power WP1 at the first linear velocity and the first linear velocity. When the recorded information is reproduced at the first linear velocity and the optimum reproduction power RP1 (TA) at the first linear velocity, the optical disc 2 to be measured has a predetermined predetermined number of reproduction durabilitys. (Step S60), the information recording / reproducing apparatus 1 uses the reproduction durability determination information creating unit 165 to calculate a new condition having a predetermined number of reproduction durability (step S70).

  Here, the process of step S70 will be described in detail with reference to FIG.

  First, the information recording / reproducing apparatus 1 records information on the optical disc 2 to be measured with the optimum recording power WP1 at the first linear velocity and the first linear velocity by the optimum reproducing power calculation unit 171. An optimum reproduction power RP1 (AL) that has a predetermined number of times of reproduction durability at the first linear velocity is calculated according to Arrhenius' law (step S71).

  Next, the information recording / reproducing apparatus 1 uses the combination of the optimum recording power WP1 and the optimum reproducing power RP1 (AL) at the first linear velocity and the inclination of the determination information table TA by the linear relationship creating unit 172, A new determination information table TB is created (step S72).

  Next, the information recording / reproducing apparatus 1 uses the second optimum recording power detection unit 166 to set a second linear velocity (for example, quadruple speed) higher than the first linear velocity with respect to the optical disk 2 to be measured. ) Is detected (step S73).

  Next, the information recording / reproducing apparatus 1 uses the second optimum reproduction power acquisition unit 167 to refer to the determination information table TB to obtain the optimum reproduction power RP2 (TB) corresponding to the optimum recording power WP2 (TB) at the second linear velocity. ) Is acquired (step S74).

  Next, the information recording / reproducing apparatus 1 uses the new reproduction condition calculation unit 168 to record information on the optical disk 2 to be measured at the second linear velocity and the optimum recording power WP2 at the second linear velocity, and record the information. When the recorded information is reproduced at the second linear velocity and the optimum reproduction power WP2 (TB) at the second linear velocity, it is determined that the optical disc 2 to be measured has a reproduction durability of the specified number of times (step S75). .

  As described above, according to the embodiment of the present invention, the information recording / reproducing apparatus 1 provides the optimum recording power and optimum reproducing power of the laser beam over a plurality of linear velocities so as to have a predetermined specified number of times of reproduction durability. A reproduction durability judgment information storage unit 161 that stores the associated reproduction durability judgment information TA, a first optimum recording power detection unit 162 that detects the optimum recording power WP1 at the first linear velocity of the optical disc 2 to be measured, and A first optimum recording power / optimum reproduction power acquisition unit 163 that obtains the optimum recording power WP1 (TA) and the optimum reproduction power RP1 (TA) at the first linear velocity with reference to the reproduction durability judgment information TA; The optimum recording power WP1 is compared with the optimum recording power WP1 (TA), information is recorded at the first linear velocity and the optimum recording power WP1, and the recorded information is recorded at the first linear velocity and the maximum. When the reproduction power RP1 (TA) is used for reproduction, the reproduction durability judgment unit 164 that determines whether or not the reproduction durability has a specified number of times and the reproduction durability determination unit 164 have no reproduction durability of the specified number of times. If it is determined, the optimum reproduction power RP1 (AL) having the reproduction durability of the specified number of times at the first linear velocity is calculated by a predetermined method, and the calculated optimum reproduction power RP1 (AL) and the reproduction durability judgment are calculated. Based on the linear relationship of the information TA, a reproduction durability judgment information creating unit 165 that creates new reproduction durability judgment information TB, and an optimum at a second linear velocity larger than the first linear velocity of the optical disc 2 to be measured The optimum reproduction power RP2 corresponding to the optimum recording power WP2 with reference to the second optimum recording power detection unit 166 that detects the recording power WP2 and the reproduction durability judgment information TB The second optimum reproduction power acquisition unit 167 for obtaining (TB) and the condition having the reproduction durability of the specified number of times in the optical disc 2 to be measured were recorded and recorded at the second linear velocity and the optimum recording power WP2. And a new reproduction condition calculation unit 168 for calculating that the information is reproduced at the second linear velocity and the optimum reproduction power RP2 (TB), so that the recording type optical disc 2 to be measured has a certain quality reproduction durability. Whether or not the recording-type optical disc 2 to be measured does not satisfy a certain quality, and easily calculates a new condition that can satisfy the certain quality. Can do.

  In particular, in BD, since the light spot diameter on the optical disk is small and the power density is high as compared with DVD and CD, the quality with respect to reproduction durability is stricter. It is useful in evaluating the reproduction durability of a BD that it is possible to calculate a new condition that satisfies a certain quality even if the BD does not satisfy a certain quality under the original conditions by the method for evaluating the reproduction durability of the optical disc. it is conceivable that. In addition, when a multi-layer disc having two or more layers is used, the medium reflectivity is lowered in order to increase the recording sensitivity of the disc, so that the quality with respect to the reproduction durability is more severe. Therefore, it is considered that the method for evaluating the reproduction durability of the optical disk according to the present embodiment is more useful for a BD multilayer disk.

<Others>
The embodiments and examples of the present invention have been described above, but the present invention is not limited to the above-described embodiments and modifications, and the present invention can be practiced without departing from the scope of the present invention. Various modifications and changes can be made to the embodiments and examples.

  For example, in the above-described embodiment, the determination information table TA includes a combination of the optimum recording power and the optimum reproduction power having a predetermined number of times of reproduction durability for each type (SL, DL) of the optical disc 2 and for each linear velocity. Although linearly stored, that is, one determination information table TA is provided for each type of the optical disc 2, a plurality of determination information tables TA may be provided.

  For example, as shown in FIGS. 9 (a) and 9 (b), the value of the combination of the optimum recording power and the optimum reproduction power having the specified number of times of reproduction durability by the manufacturer even for the same type of optical disk 2 Are different and the linear relationship is also different, it is preferable to provide a plurality of determination information tables TA. In this case, in addition to the optimum recording power WP1 at the first linear velocity, the optimum recording power WP3 at the third linear velocity (linear velocity greater than the first linear velocity) is detected, and a plurality of mediums are detected. After determining which decision information table TA should be used, the reproduction durability evaluation method for the optical disc 2 described in the above embodiment may be executed. Here, in FIG. 9A, the combination value of the optimum recording power and the optimum reproduction power at the 1 × speed is the same, but the combination value of the optimum recording power and the optimum reproduction power is different at other linear velocities. FIG. 9B shows an example in which the combination value of the optimum recording power and the optimum reproduction power is different at all linear velocities.

  In the above embodiment, it is determined whether or not the optical disc 2 to be measured has a certain level of reproduction durability based on the determination information table TA provided in the information recording / reproducing apparatus 1. In addition, another method may be used to verify whether or not the optical disc 2 to be measured has a certain level of reproduction durability. For example, when the information recording / reproducing apparatus 1 determines that the optical disc 2 to be measured has a certain quality of reproduction durability by the above-described reproduction durability evaluation method, accelerated degradation using Arrhenius law is performed. An experiment may be performed to verify whether or not the reproduction durability has a certain quality.

  In the above embodiment, the information recording / reproducing apparatus 1 includes the determination information table TA. However, the present invention is not limited to this, and the measurement target optical disk 2 may include the determination information table TA. That is, the information recording / reproducing apparatus 1 may read the judgment information stored in the judgment information table TA from the optical disc 2 to be measured, and judge the reproduction durability and calculate a new reproduction condition. In this case, since the optimum judgment information table TA is provided for each individual optical disk 2, the information recording / reproducing apparatus 1 can perform detailed reproduction durability evaluation according to individual differences of the optical disk 2.

  In the above embodiment, as illustrated in FIGS. 5 and 6, the point P3 has been described as existing in the region above the straight line L. However, the point P3 exists in the region below the straight line L. Is also good. Normally, the point P3 is considered to be present in the region above the straight line L. For example, the beam diameter of the laser beam on the optical disc 2 is different between recording and reproduction, or the optical disc 2 being measured is described above. This is because the point P3 may be calculated in the area below the straight line L when there is a special optical disc that does not have a linear relationship.

  In addition, the reproduction durability determination information storage unit 165 associates the new determination information (determination information table B) created by the reproduction durability determination information creation unit 165 with the disc information (for example, the MID code) regarding the optical disc 2 being measured. 161 may be stored. As described above, the reproduction durability determination information storage unit 161 may be a storage unit (for example, a memory) included in the information recording / reproducing apparatus 1, or a storage unit (for example, control data) included in the optical disc 2. Zone). In this case, when the reproduction durability is evaluated next time for the optical disk 2 having the same disk information, a new reproduction condition can be quickly calculated based on the stored new determination information.

  In the above embodiment, the optimum reproduction power calculation unit 171 of the information recording / reproducing apparatus 1 calculates the optimum reproduction power in the accelerated deterioration test according to the Arrhenius law. In order to further shorten the measurement time, The information recording apparatus 1 or the optical disc 2 may be previously provided with information regarding the optimum reproduction power. For example, the same accelerated deterioration test may be performed before the information recording apparatus 1 or the optical disc 2 is shipped from the factory, and information regarding the optimum reproduction power may be recorded on the information recording apparatus 1 or the optical disc 2.

  Furthermore, in the above embodiment, the optical disc 2 is limited to a recordable optical disc, but is not limited to a recordable optical disc, and a hybrid disc in which a recordable type and a reproduction type are mixed in one optical disc. You may apply to. In the case of a hybrid type disc, the reflectance of the recording type part is compared with the reflectance of the reproducing type part. A method may be applied. If the reflectance of the recording type part and the reflectance of the reproduction type part are different, the linear relationship in the above-described reproduction durability evaluation method is adjusted according to the ratio of the reflectances of the two, and reproduction is performed. It may be applied to mold parts.

It is a graph which shows the reproduction durability judgment information which matched the optimal recording power value for having the reproduction durability of 1 million times of reproduction | regeneration, and the optimal reproduction power value over several linear velocities (data of a specification document). It is a graph which shows the reproduction durability judgment information which matched the optimal recording power value for having the reproduction durability of 1 million times of reproduction | regeneration, and the optimal reproduction power value over several linear velocity (experimental value). 1 is a schematic configuration diagram of an information recording / reproducing apparatus according to an embodiment of the present invention. It is a function block diagram of the control part shown in FIG. FIG. 7 is a graph for explaining a process of calculating a new reproduction condition having a prescribed number of reproduction durabilitys in the reproduction durability evaluation method for an optical disc according to the embodiment of the present invention, together with FIG. 6. FIG. 5 is a graph for explaining a process of calculating a new reproduction condition having a prescribed number of reproduction durabilitys in the optical disk reproduction durability evaluation method according to the embodiment of the present invention together with FIG. 5. It is a flowchart which shows the reproduction durability evaluation process of the information recording / reproducing apparatus which concerns on embodiment of this invention. It is a flowchart which shows the process of step S70 of FIG. 7 in detail. 5 is a graph showing the contents of a determination information table when the determination information table includes a plurality of reproduction durability determination information for each type of optical disk in the optical disk reproduction durability evaluation method according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information recording / reproducing apparatus 2 Optical disk 11 Spindle motor 12 Optical pick-up 13 Signal amplification circuit 14 Servo circuit 15 Laser drive circuit 16 Control part 17 Semiconductor laser 18 Photodetector 161 Reproduction durability judgment information storage part 162 1st optimal recording power detection part 163 First optimum recording power / optimum reproduction power acquisition unit 164 Playback durability judgment unit 165 Playback durability judgment information creation unit 166 Second optimum recording power detection unit 167 Second optimum playback power acquisition unit 168 New playback condition calculation unit 171 Optimum Reproduction power calculation unit 172 Linear relationship creation unit

Claims (7)

An information recording / reproducing apparatus for recording information on an optical disk or reproducing information from an optical disk by emitting laser light to the optical disk,
Judgment information storage means for storing reproduction durability judgment information in which the optimum recording power and the optimum reproduction power of the laser light for having a predetermined number of times of reproduction durability are associated with each other over a plurality of linear velocities;
First optimum recording power detection means for detecting the optimum recording power at the first linear velocity of the optical disc to be measured;
Referring to the determination information storage means, first determination information acquisition means for acquiring the optimum recording power and optimum reproduction power at the first linear velocity;
The optimum recording power detected by the first optimum recording power detection means is compared with the optimum recording power at the first linear velocity acquired by the first determination information acquisition means, and the first linear velocity and When information is recorded with the optimum recording power detected by the first optimum recording power detection means, and the recorded information is reproduced with the first linear velocity and the optimum reproduction power obtained by the first determination information obtaining means. Reproduction durability judgment means for judging whether or not the prescribed number of times of reproduction durability is possessed;
When the reproduction durability determining means determines that the specified number of times of reproduction durability is not obtained, the optimum reproduction power having the specified number of times of reproduction durability at the first linear velocity is determined by a predetermined method. Determination information creating means for creating new reproduction durability determination information based on the linear relationship between the calculated optimal reproduction power and the reproduction durability determination information stored in the determination information storage means;
Second optimum recording power detection means for detecting an optimum recording power at a second linear velocity larger than the first linear velocity of the optical disc to be measured;
Second judgment information acquisition for acquiring the optimum reproduction power corresponding to the optimum recording power detected by the second optimum recording power detection means with reference to the new reproduction durability judgment information created by the judgment information creating means Means,
The condition that the reproduction durability of the specified number of times in the optical disc to be measured is that the information is recorded by recording the information with the second linear velocity and the optimum recording power detected by the second optimum recording power detecting means. New reproduction condition calculation means for calculating that the reproduction is performed at the optimum reproduction power acquired by the second linear velocity and the second determination information acquisition means;
An information recording / reproducing apparatus comprising: An information recording / reproducing apparatus for recording information on an optical disk or reproducing information from an optical disk by emitting laser light to the optical disk,
The optical disc is
Judgment information storage means for storing reproduction durability judgment information in which the optimum recording power and optimum reproduction power of the laser beam for having a predetermined number of times of reproduction durability are associated over a plurality of linear velocities is provided. And
First optimum recording power detection means for detecting the optimum recording power at the first linear velocity of the optical disc to be measured;
Referring to the determination information storage means, first determination information acquisition means for acquiring the optimum recording power and optimum reproduction power at the first linear velocity;
The optimum recording power detected by the first optimum recording power detection means is compared with the optimum recording power at the first linear velocity acquired by the first determination information acquisition means, and the first linear velocity and When information is recorded with the optimum recording power detected by the first optimum recording power detection means, and the recorded information is reproduced with the first linear velocity and the optimum reproduction power obtained by the first determination information obtaining means. Reproduction durability judgment means for judging whether or not the prescribed number of times of reproduction durability is possessed;
When the reproduction durability determining means determines that the specified number of times of reproduction durability is not obtained, the optimum reproduction power having the specified number of times of reproduction durability at the first linear velocity is determined by a predetermined method. Determination information creating means for creating new reproduction durability determination information based on the linear relationship between the calculated optimal reproduction power and the reproduction durability determination information stored in the determination information storage means;
Second optimum recording power detection means for detecting an optimum recording power at a second linear velocity larger than the first linear velocity of the optical disc to be measured;
Second judgment information acquisition for acquiring the optimum reproduction power corresponding to the optimum recording power detected by the second optimum recording power detection means with reference to the new reproduction durability judgment information created by the judgment information creating means Means,
The condition that the reproduction durability of the specified number of times in the optical disc to be measured is that the information is recorded by recording the information at the second linear velocity and the optimum recording power detected by the second optimum recording power detecting means. New reproduction condition calculation means for calculating that the reproduction is performed at the optimum reproduction power acquired by the second linear velocity and the second determination information acquisition means;
An information recording / reproducing apparatus comprising: The reproduction durability judging means includes
When the optimum recording power detected by the first optimum recording power detection means is equal to or higher than the optimum recording power at the first linear velocity acquired by the first determination information acquisition means, the first linear velocity The information is recorded with the optimum recording power detected by the first optimum recording power detection means, and the recorded information is reproduced with the first linear velocity and the optimum reproduction power obtained by the first judgment information obtaining means. Sometimes it is determined that the predetermined number of times of reproduction durability is obtained, and the optimum recording power detected by the first optimum recording power detection means is the optimum at the first linear velocity obtained by the first judgment information obtaining means. If it is less than the recording power, information is recorded at the first linear velocity and the optimum recording power detected by the first optimum recording power detection means, and the recorded information is recorded at the first linear velocity and the 1 of the determination information obtaining unit information recording and reproducing apparatus according to claim 1 or 2, wherein the determining and no reproduction durability of the predetermined number of times when the reproduced by the acquired optimum reproduction power. The determination information creating means includes
If it is determined by the reproduction durability judging means that the reproduction durability is not the prescribed number of times, the reproduction durability of the prescribed number of times at the first linear velocity is determined by an accelerated deterioration test based on the Arrhenius law. And a first determination for creating information in which the calculated optimum reproduction power is associated with the optimum recording power at the first linear velocity detected by the first optimum recording power detection means. Information creation means;
A new reproduction having the reproduction endurance of the specified number of times using an inclination in a linear relationship between the information created by the first judgment information creation means and the reproduction durability judgment information stored in the judgment information storage means Second determination information creating means for creating durability determination information;
The information recording / reproducing apparatus according to any one of claims 1 to 3, further comprising: The determination information storage means includes
Each type of optical disc has a plurality of reproduction durability judgment information,
A third optimum recording power detecting means for detecting an optimum recording power at a third linear velocity larger than the first linear velocity of the optical disc to be measured;
The reproduction durability judging means includes
The determination is based on the optimum recording power at the first linear velocity detected by the first optimum recording power detection means and the optimum recording power at the third linear velocity detected by the third optimum recording power detection means. 5. The reproduction durability judgment information corresponding to the information storage means is acquired, and the reproduction durability of the measurement target optical disk is determined based on the acquired reproduction durability judgment information. The information recording / reproducing apparatus according to any one of the above.   6. The information according to claim 1, further comprising determination information verification means for verifying validity of the reproduction durability determination information stored in the determination information storage means by a predetermined method. Recording / playback device. An information recording / reproducing apparatus for recording information on an optical disc or reproducing information from the optical disc by emitting laser light to the optical disc evaluates the reproduction durability of the optical disc,
A judgment information storage means for storing reproduction durability judgment information in which the optimum recording power and optimum reproduction power of the laser beam for having a predetermined number of times of reproduction durability are associated over a plurality of linear velocities; In a state in which the recording / reproducing apparatus or the optical disc is provided,
A first optimum recording power detection step for detecting an optimum recording power value at a first linear velocity of the optical disc to be measured;
A first determination information acquisition step of acquiring the optimum recording power and optimum reproduction power at the first linear velocity with reference to the judgment information storage means;
The optimum recording power detected in the first optimum recording power detection step is compared with the optimum recording power at the first linear velocity obtained in the first determination information obtaining step, and the first linear velocity and When information is recorded with the optimum recording power detected in the first optimum recording power detection step, and the recorded information is reproduced with the first linear velocity and the optimum reproduction power obtained in the first determination information obtaining step. A reproduction durability determination step for determining whether or not the specified number of times of reproduction durability is present;
When it is determined in the reproduction durability determination step that the reproduction durability is not the specified number of times, the optimum reproduction power having the reproduction durability of the specified number of times at the first linear velocity is determined by a predetermined method. A determination information creation step of creating new reproduction durability determination information based on the calculated optimal reproduction power and a linear relationship between the reproduction durability determination information stored in the determination information storage means;
A second optimum recording power detection step of detecting an optimum recording power at a second linear velocity larger than the first linear velocity of the optical disc to be measured;
Second determination information acquisition for acquiring the optimum reproduction power corresponding to the optimum recording power detected by the second optimum recording power detection means with reference to the new reproduction durability judgment information created in the judgment information creation step Steps,
The condition having the specified number of times of reproduction durability with respect to the measurement target optical disc was recorded and recorded with the second linear velocity and the optimum recording power detected by the second optimum recording power detection step. A new reproduction condition calculation step for calculating that the information is reproduced at the second linear velocity and the optimum reproduction power acquired by the second determination information acquisition unit;
A method for evaluating the reproduction durability of an optical disc, comprising:

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