JP3717921B2 - Recording device - Google Patents

Description

    The present invention relates to a recording apparatus compatible with high-speed recording.

In recent years, a recording layer material is changed by irradiating a light beam, and a recordable optical information recording medium for recording information, for example, a recordable compact disc (CD-R) or a rewritable compact disc ( For CD-RW), high-speed recording is progressing. There are also multi-speed optical information recording media capable of recording at an arbitrary speed, and it is required that the recording quality at low speed is good while ensuring the recording signal quality at high speed. In particular, according to Orange Book Part III, which is the standard specification for rewritable compact discs, high-speed recording that is 4 to 10 times faster than the conventional 1 to 4 times faster recording speed is being standardized. Also, when recording at a high speed, the constant linear velocity recording (CLV) method becomes severe in terms of the performance of the recording apparatus, and therefore it is necessary to record with the constant angular velocity recording (CAV) method. In order to cope with such a CAV recording method, a speed margin of about 3 times is required for a general optical disk having a diameter of 120 mm.

  However, the margin for the recording speed has come to a limit as an optical information recording medium. In particular, in the phase change type optical information recording medium, it is difficult to widen the recording speed margin due to the characteristics of the recording material. Has been. Therefore, basically, the optical information recording medium can be recorded only at a high speed. However, in reality, even with a conventional low-speed recording device, if a write command is given to the inserted optical information recording medium, the writing process is forcibly performed through a process such as setting the recording power by trial writing. However, at this time, it is not possible to write well with a low-speed recording device due to the difference in material between the conventional low-speed optical information recording medium and the high-speed optical information recording medium. The original data may be lost due to defective writing, or random writing may occur.

  Therefore, even such an optical information recording medium compatible with high-speed recording can be reproduced by a conventional low-speed recording device or reproducing device in order to have versatility and compatibility, and low-speed specification It is necessary to prevent recording by the recording apparatus.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical information recording medium that can be played back by a conventional low-speed recording device or playback device and that is compatible with high-speed recording that cannot be recorded by a low-speed recording device.

  The invention according to claim 1 is a recording apparatus for recording data on an optical information recording medium using light from an optical pickup, wherein an ATIP signal is extracted from a signal read from the optical pickup, and the ATIP signal is demodulated. A signal processing unit for detecting whether there is an address discontinuity in the optical information recording medium, and when the detection unit detects the presence of the address discontinuity, the address discontinuity A correction unit that sets a start address at a position that is a minute earlier, and the detection unit is based on ATIP information regarding the address discontinuity point that is previously grasped by the recording device and the output of the signal processing unit Recording for detecting whether or not there is an address discontinuity in the optical information recording medium on which data is recorded in the future It is the location.

  The invention according to claim 2 is the recording apparatus according to claim 1, wherein the correction unit sets t1- (t2'-t1 ') as the start address. However, t1 is an address set as a start address for an optical information recording medium having no address discontinuity, and the address discontinuity is set between addresses t1 ′ and t2 ′, and t1 ′ <t2 ′. is there.

  According to the present invention, even if there is an address discontinuity in the optical information recording medium, it is not affected by the address discontinuity, and after undergoing a trial writing process by accessing the discontinuous area, The recording process can be executed.

  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 compatible with high-speed recording according to the present invention will be described with reference to FIGS.

  In the optical information recording medium 1 of the present embodiment, sectors are formed in advance in the recordable area at least before information is recorded, and addresses are assigned to each sector. The address can specify the corresponding sector. It is preferable to record such information relating to the address so as to be placed as a modulation signal on the wobble of the guide groove of the optical information recording medium 1. For example, ATIP (Absolute Time In Pregroove) in the case of a CD-R disc or a CD-RW disc and ADIP (Address In Pregroove) in the case of a rewritable DVD + RW disc can be mentioned.

  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 that is accessed only by the recording apparatus during a recording operation (during a processing operation prior to actual recording). For example, it corresponds to an information management area of the recording apparatus. As an actual example, there is a test writing area before recording (PCA (Power Calibration Area on a CD-R disc, CD-RW disc, DVD + RW disc, etc.)) for setting the recording power relating to the laser beam of the optical pickup for recording. Applicable. This area A1 is between the start address t1 and the end address t2.

  The subsequent area A2 is an area that is accessed by the recording apparatus during the recording operation and also during the reproduction operation by the recording apparatus (during the processing operation prior to the actual reproduction). For example, it is often used as a management area for recorded information. As an actual example, a PMA (Program Memory Area) in a CD-R disc or a CD-RW disc is applicable. This area A2 is between the start address t2 and the end address t3.

  The subsequent area A3 is an area that is accessed during recording (actual recording process execution), playback (actual playback process execution) and playback (dedicated) apparatus playback of the recording apparatus, and is actually information (data). Is an area for recording. This corresponds to a program area in a CD-R disc or a CD-RW disc. This area A3 starts from the start address t3.

  Here, in the conventional optical information recording medium of the low-speed recording specification, as shown in FIG. 6, the address t is continuously assigned and set according to a predetermined rule according to the physical arrangement of the sectors on the optical information recording medium. Has been. That is, as shown in FIG. 6, the relationship between the physical arrangement of sectors and the address increases (or decreases) as the number of sectors increases. It changes continuously. The recording apparatus performs recording by detecting an absolute position on the optical information recording medium from such an address. However, when the sector information structure shown in FIG. 6 is used for an optical information recording medium for high-speed recording, there is a possibility that data is forcibly written even in the case of a low-speed recording apparatus.

  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. Is formatted. 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, satisfy t1 <t1 'to t2' <t2. .

  Such discontinuous addresses t1 'and t2' of the address t are determined on the basis of the location accessed in the area A1 by the low-speed recording device to be prevented from recording processing. For example, if a low-speed recording apparatus accesses the address t0 in the area A1 during the recording operation, the address t0 is located in the discontinuous portion, that is, the address t0 is between the addresses t1 'to t2'. Addresses t1 'to t2' are set so as to be included in

  Here, the form of the discontinuous portion of the address t can be arbitrarily set, but three typical pattern examples are illustrated in FIG. FIG. 2A shows an example of a pattern in which the discontinuous portion 2 has no sector area width. In the case of this pattern example, since there is no sector from the address t1 ′ to the address t2 ′ regarding the discontinuous part 2, discontinuity occurs in the address. In the case of this pattern example, the number of sectors in the area A1 is reduced by the addresses t1 'to t2' of the discontinuous portion 1 as compared with the conventional general address setting shown in FIG. 6, so the start address t1 of the area A1 Is set to the front side 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 becomes discontinuous is formed without reducing the number of available sectors in the area A1 and without the area where the address t is unknown. can do.

  FIG. 2B shows a pattern example in which a discontinuous portion 3 in which the address t is discontinuous from the address t1 ′ to the address t2 ′ is formed by giving the width of the area A1 ′ in the physical arrangement direction of the sector. At this time, an arbitrary address tx can be set in the region A1 ′ of the discontinuous portion 2. Therefore, by using the setting of an arbitrary address tx for the discontinuous portion 2, the discontinuous portion 3 where the address t becomes discontinuous while providing additional information, for example, information such as a description of the type of the medium. Can be formed.

  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 address t is not provided in the region A1 ′ where the discontinuous portion 4 is formed. It is a different pattern. For example, assuming that the address is recorded by wobble modulation of a pre-groove (guide groove), the address is given by a method of eliminating the wobble modulation, a method of eliminating the wobble itself, a method of eliminating the pre-groove itself, or the like. You don't have to. When the pregroove itself is eliminated, if the area A1 ′ due to the discontinuous portion 4 is long, the prepit may be set in the area A1 to prevent the off-track. At this time, information recorded in the prepit can be arbitrarily set. According to the discontinuous portion 4 that does not have an address as described above, an error can be reliably generated at the discontinuous portion 4 when recording is performed by a low-speed recording apparatus as will be described later.

Incidentally, the optical information recording medium 1 of the present embodiment has its medium characteristics improved so that high-speed recording is possible. In order to more reliably prevent recording by a low-speed recording apparatus, It is preferable to set 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 guarantee of the medium The minimum recording speed (minimum relative speed between the recordable recording apparatus and the medium) when recording at a speed that is 1/2 of Vmin, that is, a relative speed of V = 0.5 Vmin is as follows. preferable. In this case, the recording signal may be a multi-pulse train by repeating heating pulses and cooling pulses as shown in FIG. 3, and a recording signal having the longest mark length 11T may be used. The recording power Pw is arbitrarily set, and the erasing power Pe is set to 0.5 Pw.
Modulation degree m ₁₁ (= I ₁₁ / Rtop) (Rtop: information is written) when a recording signal recorded on the optical information recording medium 1 under such conditions is reproduced using the optical pickup used for recording The maximum reflectivity of the portion that is not, I ₁₁ : the reflectivity of the portion where the longest mark length 11T is recorded), and the modulation degree m ₁₁ has a characteristic that 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.

  Next, a recording apparatus 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, measures are taken that are not affected by the discontinuous portions 2, 3 or 4 during the recording operation. Although not described in detail, the recording device 5 includes a laser light source, an objective lens, a light receiving element, and the like that irradiates an optical information recording medium 1 that is rotationally driven by a spindle motor 6 for recording or reproduction. An optical pickup 7, a read signal processing unit 8 that extracts an address signal from the read signal detected and received by the optical pickup 7, and a demodulation process on the address signal obtained from the read signal processing unit 8 The address signal processing unit 9, the address discontinuity detection unit 10 as detection means for detecting the presence or absence of address discontinuity based on the output of the address signal processing unit 9, and the address discontinuity detection unit 10 When the signal is detected, an address correction unit 11 as a correction unit that performs predetermined address correction, and a laser in the optical pickup 7 It has a configuration in which a recording apparatus control unit 12 for the source.

  In such a configuration, the optical information recording medium 1 that is rotationally driven is focused and irradiated with a light beam by the optical pickup 7, and the reflected light is received by the light receiving element to read the signal. Only the address signal is extracted by the read signal processing unit 8 for the read signal. The extracted address signal is demodulated by the address signal processing unit 9 to identify the address of the part that is currently irradiated with the light beam. At this time, in the case of a conventional low-speed recording apparatus that does not have the address discontinuity detection unit 10, tracking is performed when discontinuity occurs in the address due to the discontinuous part 2, 3 or 4 part access in the area A1. Since it is determined that the error has occurred and an error signal is returned to the recording apparatus control unit 12, the subsequent processing, that is, trial writing and original recording processing cannot be performed. This prevents writing with a low-speed recording apparatus.

  On the other hand, in the case of the recording apparatus 5 of the present embodiment, the address discontinuity detecting unit 10 and the address correcting unit 11 are provided, and address information regarding the discontinuous portion 2, 3 or 4 in the area A1 of the optical information recording medium 1 is obtained. Since it is grasped in advance, even if a discontinuity occurs in the address in the area A1, the address discontinuity detection unit 10 recognizes that the address is discontinuous due to the discontinuous portion 2, 3 or 4 part access. By outputting that fact to the address correction unit 11, the address correction unit 11 performs address correction so that only the address of the discontinuous portion 2, 3 or 4 is skipped, and outputs address information to the recording device control unit 12. . As a result, the trial writing process (setting of the recording power Pw) by accessing this area A1 is performed through the control by the recording device control unit 12 without being affected by the discontinuity of the address due to the discontinuous portions 2, 3 or 4. After that, the original recording process for the area A3 and the like becomes possible.

  In the reproduction processing by the recording device or the reproduction device, regardless of the low-speed specification / high-speed specification, the area t of the areas A2 and A3 in which the address t is continuously set according to the physical arrangement of the sectors is accessed without accessing the area A1. Because it becomes access, playback can be performed without any problem.

  An example of the present invention according to the above-described embodiment will be described.

<Example 1>
A continuous guide groove (groove) was formed in a spiral shape on a polycarbonate transparent substrate to prepare a substrate for CD-RW. With respect to the address information (ATIP) recorded in the guide groove, discontinuous portions 2 having ATIP discontinuities of the pattern example as shown in FIG. 2A are formed at the addresses t1 ′ and t2 ′ shown below as follows. .

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 test writing is performed while changing the power so that the recording apparatus determines 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 during recording by the recording apparatus.

  In addition, for areas other than the discontinuous portion 2 of such addresses, the normal playback speed of a compact disc compliant with the CD-RW standard book Orange Book Part III ver. 2.0 is 1 to 4 times (1X to 4X). The ATIP information corresponding to the records up to) was recorded.

As shown in FIG. 5, the optical information recording medium 1 in which the lower dielectric layer 14, the recording layer 15, the upper dielectric layer 16, the metal reflective layer 17, and the protective layer 18 are formed on such a transparent substrate 13 is formed. . The lower dielectric layer 14 and the upper dielectric layer 16 are made of a mixture mainly containing ZnS and SiO ₂ , the recording layer 15 is made of a phase change material mainly containing AgInTeSb, and the metal reflective layer 17 is mainly made of Al. Consists of ingredients. The lower dielectric layer 14 and the upper dielectric layer 16 were formed by RF sputtering, and the recording layer 15 and the metal reflective layer 17 were formed by DC sputtering. The protective layer 18 was formed by depositing a UV curable resin by spin coating and then curing it by irradiating with UV light.

  The optical information recording medium 1 obtained in this way was initialized using a CD-RW initialization apparatus, whereby an unrecorded CD-RW medium could be obtained. In the created media, the above-described discontinuous portions 2 where the addresses are discontinuous are formed in the PCA area.

  In this way, a test was conducted to determine whether or not a commercially available (low-speed specification) recording device can record CD-RW media having discontinuous portions 2 where addresses are discontinuous in the PCA area. The recording apparatus 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 using such a recording apparatus, an error occurred in the initial stage of the recording operation, and the medium was ejected without recording.

  On the other hand, when the recording apparatus is modified to add the address discontinuity detecting unit 10 and the address correcting unit 11 to perform the recording operation on the CD-RW medium (optical information recording medium 1), the discontinuous part 2 Even if there is a discontinuity in the ATIP in the PCA area, the address correction unit 11 corrects the discontinuous address at 00:30 to perform a recording operation such as test writing without any problem. Recording has started. In this way, recording is possible with the recording device 5 of the present embodiment, but recording with the conventional low-speed specification cannot be performed on the optical information recording medium 1 according to the present embodiment. It has been confirmed.

<Example 2>
A CD-RW media was created in the same manner as in Example 1. However, the composition ratio of the recording layer material was changed and adjustment was performed so that recording could be performed at a high speed of 4X to 8X. Using the CD-RW disc evaluation apparatus DDU1000 (λ = 789 nm, NA = 0.50), the created media is converted into 8X (V = 9.6 m / s), 4X (V = 4.8 m / s), and 2X (V = 2.4 m / s), recording was performed with a recording signal having a multi-pulse waveform as shown in FIG. The recording power Pw was determined according to the OPC method according to Orange Book Part III ver.2.0, which is a CD-RW standard.

  The signal after recording was read at the reproduction speed X1, and the modulation degree m was measured for each recording speed.

8X: I ₁₁ /Itop=0.65
4X: I ₁₁ /Itop=0.56
2X: I ₁₁ /Itop=0.45
Recording signals at recording speeds of 8X and 4X have a sufficient degree of modulation, but recording signals at low speeds such as 2X have a low degree of modulation, which is 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.

  When such a CD-RW medium was tried to be written by a conventional recording apparatus that does not have the address discontinuity detection unit 10 or the like used in the first embodiment, it was similarly ejected before recording.

It is explanatory drawing which shows typically the sector address structure regarding one embodiment of this invention. It is the number of sectors-address characteristic diagram which illustrates three examples of the pattern of the discontinuous part of the address regarding the optical information recording medium of one embodiment of this invention. It is a wave form diagram of the example of a pattern of a recording signal. FIG. 2 is a block diagram illustrating a schematic configuration of a recording apparatus. It is sectional drawing which shows the example of a cross-section of an optical information recording medium. It is a sector number-address characteristic view regarding a conventional general optical information recording medium.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical information recording medium 2, 3, 4 Discontinuous part 5 Recording apparatus 7 Optical pick-up 8 Read signal processing part 10 Detection means (address discontinuity detection part), Address discontinuity detection part 11 Correction means (address correction part), Address Correction unit

Claims (2)

A recording apparatus for recording data on an optical information recording medium using light from an optical pickup,
A signal processing unit that extracts an ATIP signal from a signal read from the optical pickup and demodulates the ATIP signal;
A detection unit for detecting whether or not address discontinuity exists in the optical information recording medium;
A correction unit that sets a start address at a position before the address discontinuity when the presence of the address discontinuity is detected by the detection unit;
The detecting unit has an address discontinuous portion in the optical information recording medium on which data is recorded in the future based on ATIP information regarding the address discontinuous portion that has been grasped in advance by the recording apparatus and an output of the signal processing unit. A recording apparatus which detects whether or not it exists. The recording apparatus according to claim 1,
The correction unit sets t1- (t2'-t1 ') as the start address. However, t1 is an address set as a start address for an optical information recording medium having no address discontinuity, and the address discontinuity is set between addresses t1 ′ and t2 ′, and t1 ′ <t2 ′. is there.

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