JP2004030900A - Recording apparatus and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute substantial recording processing to other area through trial write processing or the like by access to a discontinuous area without being affected by discontinuity of addresses at discontinuous parts even when discontinuity of addresses exists in an optical information recording medium. <P>SOLUTION: A recording apparatus for recording information by emitting a light from an optical pickup 7 to the optical information recording medium 1 detects presence / absence of discontinuous parts of addresses of the optical information recording medium (detection means 10) on the basis of the signal detected by the optical pickup 7 and corrects the discontinuous addresses (correction means 11) when detecting the discontinuous part. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording apparatus and a recording method compatible with high-speed recording.
[0002]
[Prior art]
In recent years, a recording layer material is changed by irradiating a light beam to record information, such as a recordable optical disc (CD-R) or a rewritable compact disc (CD-R). Regarding CD-RW, high-speed recording has been progressing. In addition, there is an optical information recording medium that supports multi-speed recording at an arbitrary speed, and it is required that the recording quality at a low speed is good while the quality of a recording signal at a high speed is ensured. In particular, according to the Orange Book Part III, which is a standard specification for a rewritable compact disc, a recording speed of 4 to 10 times that of the conventional recording speed of 1 to 4 times is being standardized. Further, at high speed recording, the performance of the recording apparatus becomes severe in the constant linear velocity recording (CLV) method, so that it is necessary to perform recording in the constant angular velocity recording (CAV) method. In order to cope with such a CAV recording method, a general optical disk having a diameter of 120 mm requires a speed margin about three times.
[0003]
[Problems to be solved by the invention]
However, the margin for the recording speed has reached the limit as the optical information recording medium, and in particular, in the phase change type optical information recording medium, it is difficult to widen the margin of the recording speed due to the characteristics of the recording material. Have been. Therefore, basically, the optical information recording medium can be recorded only at high speed. However, in reality, even in a conventional low-speed recording apparatus, when a write command is given to an inserted optical information recording medium, the write processing is forcibly performed through a process such as setting recording power by trial writing. However, at this time, it is not possible to write well with a low-speed specification recording device due to a difference in material between a conventional low-speed specification optical information recording medium and a high-speed specification optical information recording medium. The original data may be lost due to defective writing, or random writing may be performed.
[0004]
Therefore, even such an optical information recording medium compatible with high-speed recording can be reproduced by a conventional low-speed specification recording device or reproducing device in order to provide versatility and compatibility, and at the same time, it is possible to reproduce the low-speed specification. It is necessary to prevent recording by the recording device.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical information recording medium that can be reproduced by a conventional low-speed specification recording device or reproduction device and cannot be recorded by a low-speed specification recording device.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a recording apparatus that records information by irradiating light from an optical pickup to an optical information recording medium, wherein the recording of the optical information recording medium is performed based on a signal detected by the optical pickup. A recording apparatus comprising: a detecting unit that detects the presence or absence of a discontinuous portion of an address; and a correcting unit that corrects a discontinuous address when the detecting unit detects the discontinuous portion. .
[0007]
According to a second aspect of the present invention, in the recording apparatus according to the first aspect, the correction means corrects an address so as to skip the discontinuous address.
[0008]
According to a third aspect of the present invention, in the recording apparatus according to the first or second aspect, the address correction by the correction unit is performed by setting a power of light emitted from the optical pickup when recording information. It is performed at the time of processing.
[0009]
According to a fourth aspect of the present invention, in the recording apparatus according to any one of the first to third aspects, when the detection unit detects that there is an address discontinuity, the correction unit relates to a discontinuous portion which is grasped in advance. The address is corrected based on the address information.
[0010]
According to a fifth aspect of the present invention, there is provided a recording apparatus for recording information by irradiating an optical information recording medium with light from an optical pickup, wherein an address signal is extracted from a read signal detected by the optical pickup. A read signal processing unit to be performed; an address discontinuity detection unit that detects the presence / absence of a discontinuity in an address of the optical information recording medium based on an output of the read signal processing unit; And an address correction unit that corrects the discontinuous address when the is detected.
[0011]
The invention according to claim 6 is a recording method for recording information by irradiating an optical information recording medium with light from an optical pickup, wherein the address of the optical information recording medium is determined based on a signal detected by the optical pickup. A step of detecting the presence or absence of a discontinuous portion, and a step of correcting a discontinuous address when the detecting portion detects the discontinuous portion.
[0012]
According to a seventh aspect of the present invention, in the address correction method according to the sixth aspect, the address correction in the address correcting step is performed by skipping the discontinuous addresses.
[0013]
According to an eighth aspect of the present invention, in the address correction method according to the sixth or seventh aspect, the correction of the address in the step of correcting the address is performed by adjusting the power of light emitted from the optical pickup at the time of recording information. It is characterized in that it is performed at the time of test writing processing for setting.
[0014]
According to a ninth aspect of the present invention, in the recording apparatus according to any one of the sixth to eighth aspects, when it is detected that there is an address discontinuity in the step of detecting the presence or absence of a discontinuity in the address of the optical information recording medium, In the step of correcting the address, the address is corrected based on address information regarding a discontinuous portion which is grasped in advance.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. First, the sector address structure of the recordable optical information recording medium 1 according to the present invention and compatible with high-speed recording will be described with reference to FIGS.
[0016]
In the optical information recording medium 1 of the present embodiment, at least before information is recorded, sectors are previously formed in a recordable area thereof, and addresses are assigned to the respective sectors. The address can specify the corresponding sector. It is preferable that such information relating to the address is recorded so as to be recorded as a modulation signal on the wobble of the guide groove of the optical information recording medium 1. For example, there is ATIP (Absolute Time In Pregroove) in the case of a CD-R disc or CD-RW disc, and ADIP (Address In Pregroove) in the case of a rewritable DVD + RW disc.
[0017]
Such an optical information recording medium 1 has at least three recordable areas A1, A2 and A3 as shown in FIG. The area A1 is an area to which the printing apparatus accesses only during a printing operation (during a processing operation prior to actual printing). For example, it corresponds to the information management area of the recording device. As a practical example, a test writing area (PCA (Power Calibration Area) for a CD-R disc, CD-RW disc, DVD + RW disc, etc.) before recording for setting a recording power for a laser beam of a recording optical pickup is used. Applicable. The area A1 extends from the start address t1 to the end address t2.
[0018]
The subsequent area A2 is an area that is accessed during the recording operation of the recording apparatus and also accessed during the reproducing operation (the processing operation prior to the actual reproduction) by the recording apparatus. For example, it is often used as a management area for recorded information. As a practical example, a PMA (Program Memory Area) on a CD-R disc or a CD-RW disc corresponds to this. The area A2 extends from the start address t2 to the end address t3.
[0019]
The following area A3 is an area to be accessed at the time of recording (at the time of actual recording processing execution), at the time of reproduction (at the time of actual reproduction processing execution), and at the time of reproduction of a reproduction (dedicated) apparatus. Is an area in which is recorded. A program area on a CD-R disc or CD-RW disc corresponds to the program area. This area A3 starts from a start address t3.
[0020]
Here, in the conventional optical information recording medium of the low-speed recording specification, as shown in FIG. 6, according to a physical arrangement of the sectors on the optical information recording medium, the address t is continuously allocated and set according to a predetermined rule. Have been. That is, as shown in FIG. 6, the relationship between the physical arrangement of the sectors and the addresses increases (or decreases) with the increase in the number of sectors. It changes continuously. The recording device detects an absolute position on the optical information recording medium from such an address and performs recording. However, when an optical information recording medium for high-speed recording has a sector address structure as shown in FIG. 6, writing may be forcibly performed even in a low-speed specification recording apparatus.
[0021]
In this regard, in the optical information recording medium 1 of the present embodiment, at least one or more discontinuous portions where the address t is discontinuous with respect to the physical arrangement of the sectors are provided in the area A1 accessed only during the recording operation. It is formatted as follows. This discontinuous portion is set between addresses t1 'and t2', and these addresses t1 'and t2' are set so as to satisfy the area A1, that is, t1 <t1 'to t2'<t2. .
[0022]
The addresses t1 'and t2' at such discontinuous locations of the address t are determined based on the locations accessed in the area A1 by the low-speed specification recording apparatus whose recording processing is to be prevented. For example, if a low-speed recording apparatus accesses the address t0 in the area A1 during the recording operation, the address t0 is set at a discontinuous portion, that is, the address t0 is set between the addresses t1 'and t2'. Are set such that the addresses t1 'to t2' are included in.
[0023]
Here, the form of the discontinuous portion of the address t can be set arbitrarily, and FIG. 2 shows three typical pattern examples. FIG. 2A shows an example of a pattern in which a discontinuous portion 2 in which there is no width of a sector region is set. In the case of this pattern example, since there is no sector from the address t1 'to the address t2' relating to the discontinuous point 2, a discontinuity occurs in the address. In the case of this pattern example, the number of sectors in the area A1 is reduced by the address t1 'to t2' of the discontinuous point 1 as compared with the conventional general address setting shown in FIG. Is set to the front by this decrease. That is, t1- (t2'-t1 ') is set as the start address. According to such a pattern example, the discontinuous portion 2 where the address t is discontinuous is formed without reducing the number of available sectors in the region A1 and without any region where the address t is unknown. can do.
[0024]
FIG. 2B shows an example of a pattern in which a discontinuous portion 3 where the address t is discontinuous from the address t1 'to the address t2' is formed with the width of the area A1 'in the physical arrangement direction of the sectors. At this time, an arbitrary address tx can be set freely in the area A1 'of the discontinuous portion 2. Therefore, by using the setting of an arbitrary address tx for the discontinuous point 2, the discontinuous point 3 where the address t becomes discontinuous while having additional information, for example, information such as a description of the type of medium, is provided. Can be formed.
[0025]
FIG. 2C shows an example of a pattern in which the discontinuous portion 4 is the same as the discontinuous portion 3 in the case of FIG. 2B, but the region A1 'where the discontinuous portion 4 is formed does not have the address t. It is a different pattern in point. For example, assuming that an address is recorded by wobble modulation of a pre-groove (guide groove), the address is provided by a method of eliminating wobble modulation, a method of eliminating the wobble itself, a method of eliminating the pre-groove itself, or the like. You just need to avoid it. When the pre-groove itself is eliminated and the area A1 'due to the discontinuous portion 4 is long, the pre-pits may be set in the area A1 to prevent a track off. At this time, information to be recorded in the pre-pit can be set arbitrarily. According to the discontinuous portion 4 having no address as described above, an error can be reliably generated at the discontinuous portion 4 when recording is performed by a low-speed specification recording apparatus as described later.
[0026]
By the way, the optical information recording medium 1 of the present embodiment has its medium characteristics improved so as to enable high-speed recording. However, in order to more reliably prevent recording by a low-speed specification recording apparatus, the following is required. It is preferable that the setting is made so as to have the following characteristics. That is, when a CD optical pickup having a wavelength λ = 789 nm and an objective lens numerical aperture NA = 0.50 or a DVD optical pickup having a wavelength λ = 650 nm and an objective lens numerical aperture NA = 0.60 is used, the medium is guaranteed. The characteristic at the time of recording at a half speed of the minimum recording speed (minimum relative speed between the recordable recording device and the medium) Vmin, that is, at a relative speed of V = 0.5 Vmin, is as follows. preferable. In this case, the recording signal may be a multi-pulse train formed by repetition of a heating pulse and a cooling pulse as shown in FIG. The recording power Pw is set arbitrarily, and the erasing power Pe is set to 0.5 Pw. Modulation degree m ₁₁ (= I ₁₁ / Rtop) (Rtop: information is written when the recording signal recorded on the optical information recording medium 1 is reproduced using the optical pickup used for recording under such conditions. The maximum reflectivity of the unexposed portion, I ₁₁ : the reflectivity of the portion where the longest mark length 11T is recorded, is measured, and the modulation factor m ₁₁ has a characteristic of m ₁₁ ≦ 0.5. In the optical information recording medium 1 having such characteristics, the degree of modulation at the maximum recording speed Vmax guaranteed by the medium can be increased, and stable recording signal characteristics can be obtained during high-speed recording.
[0027]
Next, a recording device 5 capable of recording on the optical information recording medium 1 compatible with high-speed recording as in the present embodiment will be described with reference to FIG. Basically, a countermeasure is taken so as not to be affected by the discontinuous portions 2, 3 or 4 during the recording operation. Although not described in detail, the recording apparatus 5 includes a laser light source for irradiating a recording or reproducing light beam to the optical information recording medium 1 rotated and driven by the spindle motor 6, an objective lens, a light receiving element, and the like. An optical pickup 7, a read signal processing unit 8 for extracting an address signal from a read signal received and detected by the optical pickup 7, and a demodulation process for an address signal obtained from the read signal processing unit 8 An address signal processing unit 9; an address discontinuity detection unit 10 as detection means for detecting the presence or absence of an address discontinuity based on the output of the address signal processing unit 9; Address correction unit 11 as a correction means for performing a predetermined address correction when a signal is detected, and a laser in the optical pickup 7 It has a configuration in which a recording apparatus control unit 12 for the source.
[0028]
In such a configuration, a signal beam is read out by condensing and irradiating a light beam onto the optical information recording medium 1 that is rotationally driven by the optical pickup 7 and receiving the reflected light with a light receiving element. For the read signal, only the address signal is extracted by the read signal processing unit 8. The extracted address signal is demodulated by the address signal processing unit 9 to specify the address of the position where the light beam is currently irradiated. At this time, in the case of a conventional low-speed specification recording apparatus that does not have the address discontinuity detecting unit 10, if an address discontinuity occurs due to access to the discontinuous area 2, 3 or 4 during access to the area A1, tracking is performed. Since it is determined that a deviation has occurred, an error signal is returned to the recording device control unit 12, so that it is not possible to shift to the subsequent processing, that is, test writing or the original recording processing. This prevents writing by a low-speed specification recording device.
[0029]
On the other hand, in the case of the recording apparatus 5 of the present embodiment, an address discontinuity detecting unit 10 and an address correcting unit 11 are provided, and the address information on the discontinuous portion 2, 3 or 4 in the area A1 of the optical information recording medium 1 is stored. Since it is known in advance, even if an address discontinuity occurs in the access to the area A1, the address discontinuity detecting unit 10 recognizes that the address is discontinuous due to access to the discontinuous portion 2, 3 or 4. By outputting the information to the address correction unit 11, the address correction unit 11 corrects the address so as to skip the address of the discontinuous portion 2, 3 or 4, and outputs the address information to the recording device control unit 12. . Thus, the test writing process (setting of the recording power Pw) by accessing the area A1 can be performed without being affected by the discontinuity of the address due to the discontinuous portion 2, 3 or 4, through the control or the like by the recording device controller 12. After that, the original recording processing for the area A3 and the like becomes possible.
[0030]
Regarding the reproduction processing by the recording apparatus or the reproduction apparatus, regardless of the low-speed specification / high-speed specification, the address t is not accessed in the area A1, and the address t is continuously set in the areas A2 and A3 in accordance with the physical arrangement of the sectors. Since it is an access, reproduction can be performed without any trouble.
[0031]
【Example】
An example of the present invention according to the above-described embodiment will be described.
[0032]
<Example 1>
A continuous guide groove (groove) was spirally formed on a polycarbonate transparent substrate to prepare a CD-RW substrate. Regarding the address information (ATIP) recorded in the guide groove, a discontinuous portion 2 where the ATIP is discontinuous in the pattern example as shown in FIG. 2A is formed at the following addresses t1 'and t2' as follows. .
[0033]
t1 = 96: 25: 10
t1 '= 96: 41: 49
t2 '= 97: 11: 50
t2 = 97: 23: 50
t3 = 97: 27: 00
The area where the discontinuous portion 2 is formed is PCA, and is an area where the recording apparatus performs test writing while changing the power in order to determine the recording power Pw during the recording operation. This area corresponds to A1. The addresses t1 'and t2' are determined in consideration of the access position at the time of recording of the recording device.
[0034]
Regarding the area other than the discontinuous portion 2 of such an address, refer to the Orange Book Part III ver. ATIP information corresponding to recording up to 1 to 4 times (1X to 4X) the normal reproduction speed of a compact disc conforming to 2.0 was recorded.
[0035]
As shown in FIG. 5, an optical information recording medium 1 in which a lower dielectric layer 14, a recording layer 15, an upper dielectric layer 16, a metal reflective layer 17, and a protective layer 18 were formed on such a transparent substrate 13 was formed. . The lower dielectric layer 14 and the upper dielectric layer 16 are made of a mixture mainly composed of ZnS and SiO ₂ , the recording layer 15 is composed of a phase change material mainly composed of AgInTeSb, and the metal reflection layer 17 is mainly composed of Al. It consists of the material used as a component. The lower dielectric layer 14 and the upper dielectric layer 16 were formed by an RF sputtering method, and the recording layer 15 and the metal reflection layer 17 were formed by a DC sputtering method. The protective layer 18 was formed by forming a UV curable resin by a spin coating method and then irradiating with UV light.
[0036]
By initializing the optical information recording medium 1 thus obtained using a CD-RW initialization device, an unrecorded CD-RW medium could be obtained. In the created medium, the above-mentioned discontinuous portion 2 where the address is discontinuous is formed in the PCA area.
[0037]
A test was conducted to determine whether a CD-RW medium having discontinuous locations 2 where addresses are discontinuous in the PCA area can be recorded by a commercially available (low-speed specification) recording device. The recording device on which the test was performed is a CD-R / RW drive MP-7060A manufactured by Ricoh Co., Ltd. When the created CD-RW medium was recorded by using such a recording apparatus, an error occurred in an initial stage of the recording operation, and the medium was ejected without recording.
[0038]
On the other hand, the recording apparatus described above was modified to add an address discontinuity detecting unit 10 and an address correcting unit 11 to perform a recording operation on a CD-RW medium (optical information recording medium 1). Even if there is a discontinuity in ATIP in the PCA area, a recording operation such as test writing is performed without any problem by correcting the discontinuous address of 00:30:00 by the address correction unit 11, and then the actual operation is continued. Recording has begun. In this way, recording can be performed by the recording device 5 of the present embodiment, but recording cannot be performed on the optical information recording medium 1 according to the present embodiment by a conventional recording device with low-speed specifications. It has been confirmed.
[0039]
<Example 2>
A CD-RW medium was created in the same manner as in Example 1. However, the composition ratio of the recording layer material was changed so that the recording was performed at a high speed of 4X to 8X. The created media was converted to 8X (V = 9.6 m / s), 4X (V = 4.8 m / s), and 2X (V) using a CD-RW disc evaluation device DDU1000 (λ = 789 nm, NA = 0.50). = 2.4 m / s), and recording was performed with a recording signal having a multi-pulse waveform as shown in FIG. The recording power Pw is described in Orange Book Part III ver. It was determined according to the OPC method based on 2.0.
[0040]
The recorded signal was read at the reproduction speed X1, and the modulation m was measured at each recording speed. The result was as follows.
[0041]
8X: I ₁₁ / I top = 0.65
4X: I ₁₁ /Itop=0.56
2X: I ₁₁ /Itop=0.45
The recording signals at the recording speeds of 8X and 4X have a sufficient modulation degree, but the recording signals at a low speed as in the past such as 2X have a low modulation degree and fall below the minimum standard value of CD-RW of 0.55. ing. Therefore, it can be seen that the medium cannot be recorded by the low-speed specification such as 2X.
[0042]
When an attempt was made to write such a CD-RW medium in a conventional recording apparatus having no address discontinuity detection unit 10 or the like used in the first embodiment, it was similarly ejected before recording.
[0043]
【The invention's effect】
According to the present invention, even if there is a discontinuity in the address of the optical information recording medium, it is not affected by the discontinuity in the address, and through a trial writing process by accessing the discontinuous area, the original information can be transmitted to the other area. Can be executed.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram schematically showing a sector address structure according to an embodiment of the present invention.
FIG. 2 is a number-of-sectors-address characteristic diagram illustrating three example patterns of discontinuous addresses in an optical information recording medium according to an embodiment of the present invention;
FIG. 3 is a waveform diagram illustrating an example of a pattern of a recording signal.
FIG. 4 is a block diagram illustrating a schematic configuration of a recording apparatus.
FIG. 5 is a sectional view showing an example of a sectional structure of an optical information recording medium.
FIG. 6 is a characteristic diagram of the number of sectors versus address for a conventional general optical information recording medium.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical information recording media 2, 3, 4 Discontinuity point 5 Recording device 7 Optical pickup 8 Read signal processing unit 10 Detection means (address discontinuity detection unit), address discontinuity detection unit 11 Correction means (address correction unit), address Correction unit

Claims (9)

A recording device that records information by irradiating light from an optical pickup to an optical information recording medium,
Detecting means for detecting the presence or absence of a discontinuous portion of the address of the optical information recording medium based on a signal detected by the optical pickup;
Correcting means for correcting a discontinuous address when the discontinuous portion is detected by the detecting means;
A recording device comprising: 2. The recording apparatus according to claim 1, wherein the correction unit corrects an address so as to skip the discontinuous address. 3. The recording apparatus according to claim 1, wherein the correction of the address by the correction unit is performed during a test writing process for setting the power of light emitted from the optical pickup when recording information. 4. The apparatus according to claim 1, wherein the correction unit corrects an address based on address information regarding a discontinuous portion that is grasped in advance when the detection unit detects that there is an address discontinuity. 5. Recording device. A recording device that records information by irradiating light from an optical pickup to an optical information recording medium,
A read signal processing unit that extracts an address signal for a read signal detected by the optical pickup;
An address discontinuity detection unit that detects the presence or absence of a discontinuity in the address of the optical information recording medium based on the output of the read signal processing unit;
An address correction unit for correcting an address of a discontinuity when the discontinuous portion is detected by the address discontinuity detection unit;
A recording device comprising: A recording method for recording information by irradiating light from an optical pickup to an optical information recording medium,
Detecting the presence or absence of a discontinuous portion of the optical information recording medium address based on the signal detected by the optical pickup,
Correcting the discontinuous address when the discontinuous portion is detected by the detecting means;
A recording method comprising: 7. The address correction method according to claim 6, wherein the correction of the address in the step of correcting the address is performed by skipping the discontinuous address. 8. The method according to claim 6, wherein the address correction in the address correcting step is performed during a test writing process for setting a power of light emitted from the optical pickup when recording information. Address correction method. In the step of detecting the presence or absence of a discontinuity in the address of the optical information recording medium, when it is detected that there is a discontinuity in the address, the step of correcting the address includes the step of correcting the address based on address information on the discontinuity previously grasped 9. The recording apparatus according to claim 6, wherein the recording is performed.

Images