JP2003338036A - Optical information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium which can be reproduced by a recording device and reproducing device of the conventional low-speed specifications and deals with high-speed recording not possible with the recording device of the low-speed specifications. <P>SOLUTION: The modulation degree when the longest mark for the optical information recording medium 1 is recorded at a recording speed of V=0.5 Vmin with respect to the assured minimum recording speed Vmin of the recording medium 1 with which recording of information is performed by irradiating the medium with light is so determined as to be below the minimum regulated value of the recording medium 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an optical information recording medium compatible with high speed recording.

[0002]

2. Description of the Related Art In recent years, a recordable optical information recording medium, such as a recordable compact disc (CD-R) or a rewritable medium, is used for recording information by changing the recording layer material by irradiating a light beam. Regarding possible compact discs (CD-RW), high-speed recording has been advanced. There are also multi-speed compatible optical information recording media that can be recorded at an arbitrary speed, and it is required that the recording quality at a high speed be ensured and that the recording quality at a low speed be good. In particular, according to Orange Book Part III, which is a standard specification for rewritable compact discs, high speed recording which is 4 to 10 times faster than the conventional 1 to 4 times faster recording speed is being standardized. Further, at high-speed recording, the constant linear velocity recording (CLV) system is strict in terms of the performance of the recording apparatus, and therefore it is necessary to perform recording by the constant angular velocity recording (CAV) system. In order to support such a CAV recording method, a general optical disc having a diameter of 120 mm requires a speed margin of about three times.

[0003]

However, the margin for the recording speed has reached the limit for the optical information recording medium. Especially, in the phase change type optical information recording medium, the margin of the recording speed is due to the characteristics of the recording material. It is said that it is difficult to widen. Therefore, basically, the optical information recording medium can be recorded only at high speed. However, in reality, even in the conventional low speed specification recording apparatus, when a write command is given to the inserted optical information recording medium, the write processing is forcibly performed through a process such as setting the recording power by trial writing. Although it may be done, at this time, since it is not possible to write well in the recording device of the low speed specification due to the difference in material between the conventional optical information recording medium of the low speed specification and the optical information recording medium of the high speed specification, as a result, 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 specification recording device or reproducing device in order to have versatility and compatibility, and It is necessary to prevent recording with a low speed recording device.

Therefore, an object of the present invention is to provide an optical information recording medium capable of high-speed recording, which can be reproduced by a conventional low-speed recording device or reproducing device and which cannot be recorded by a low-speed recording device. And

[0006]

The invention according to claim 1 is
An optical information recording medium in which information is recorded by irradiating light, the optical information recording medium having a recording speed V = 0.5 Vmin with respect to a minimum recording speed Vmin guaranteed by the optical information recording medium. The degree of modulation when the longest mark is recorded is less than the minimum standard value of the optical information recording medium.

According to a second aspect of the present invention, in the optical information recording medium according to the first aspect, the minimum recording speed Vmin guaranteed by the optical information recording medium is four times the normal reproduction speed of a compact disc. Characterize.

According to a third aspect of the present invention, in the optical information recording medium according to the first or second aspect, the minimum standard value of the optical information recording medium is 0.55.

The invention according to claim 4 is the invention according to claims 1 to 3.
The optical information recording medium as described in any one of 1 to 3, wherein the optical information recording medium is provided with a lower dielectric layer, a recording layer, an upper dielectric layer, a metal reflection layer, and a protective layer on a transparent substrate. And

According to a fifth aspect of the present invention, in the optical information recording medium according to the fourth aspect, the recording layer is AgInTe.
It is characterized by having Sb as a main component.

According to a sixth aspect of the present invention, in the optical information recording medium according to the fourth or fifth aspect, the lower dielectric layer and the upper dielectric layer are mainly composed of ZnS and SiO _2. And

The invention according to claim 7 is the invention according to claims 4 to 6.
In the optical information recording medium described in any one of the above 1, the metal reflective layer is mainly composed of Al.

The invention as defined in claim 8 is defined by claim 1 through claim 7.
In the optical information recording medium described in any one of the above 1, the optical information recording medium is a phase change recording medium.

The invention according to claim 9 is the invention according to claims 1 to 8.
In the optical information recording medium described in any one of the above 1, the optical information recording medium is a CD-R.

[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 and high-speed recording optical information recording medium 1 of the present invention will be described with reference to FIGS.

In the optical information recording medium 1 of the present embodiment, at least a sector is previously formed in a recordable area thereof before recording information, and an address is assigned to each sector. The address can identify the corresponding sector. It is preferable that the recording of the information regarding the address is performed so that it is mounted on the wobble of the guide groove of the optical information recording medium 1 as a modulation signal. For example, ATIP (Absolute Time In Pregroove) in the case of a CD-R disc or a CD-RW disc, and ADIP in the case of a rewritable DVD + RW disc.
(AddressIn Pregroove).

Such an optical information recording medium 1 has at least three recordable areas A1 and A as shown in FIG.
2 and A3. The area A1 is an area that the printing apparatus accesses only during a printing operation (during a processing operation prior to actual printing). For example, this corresponds to the information management area of the recording device. As a practical example, a test writing area before recording (CD-R disc, CD-RW disc, D for setting the recording power relating to the laser light of the optical pickup for recording)
PCA (Power Calibrat) for VD + RW discs
ion Area)) is applicable. The area A1 is between the start address t1 and the end address t2.

The subsequent area A2 is an area which the recording apparatus accesses during the recording operation and also during the reproducing operation by the recording apparatus (the processing operation prior to the actual reproduction). For example, it is often used as a management area for recorded information. As a practical example, a CD-R disc or a C
PMA (Program Memory Are) for D-RW discs
a) applies. The area A2 is between the start address t2 and the end address t3.

The following area A3 is an area to be accessed when recording (when actually executing recording processing) and reproducing (when actually reproducing processing) of the recording apparatus and when reproducing (dedicated) the apparatus, and is actually the information. This is an area for recording (data).
It 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 low speed recording type optical information recording medium, as shown in FIG. 6, the addresses t are continuous according to a predetermined law according to the physical arrangement of the sectors on the optical information recording medium. It is set to be allocated to. That is, the relationship between the physical array of sectors and the address is shown in FIG.
As shown in, the address increases (or decreases) as the number of sectors increases, but the address always changes continuously according to the law peculiar to the medium. The recording device detects the absolute position on the optical information recording medium from such an address and performs recording. However, in the case of the optical information recording medium for high speed recording, if the sector address structure as shown in FIG. 6 is used, writing may be forcibly performed even in the case of a low speed recording device.

In this respect, the optical information recording medium 1 of the present embodiment
Then, regarding the area A1 that is accessed only during the recording operation,
This is a format in which at least one discontinuous portion where the addresses t are discontinuous is provided with respect to the physical array of sectors. This discontinuity is at address t
It is set between 1'-t2 'and these addresses t
1 ', t2' are in the area A1, that is, t1 <t1'-t
It is set to satisfy 2 '<t2.

The addresses t1 'and t2' at the discontinuous points of the address t are determined based on the points accessed in the area A1 by the low-speed specification recording apparatus whose recording processing is desired to be prevented. For example, if the low-speed recording device accesses the address t0 in the area A1 during the recording operation, the address t0 is set at a discontinuous position.
That is, the addresses t1 'to t2' are set so that the address t0 is included between the addresses t1 'to t2'.

Here, the form of the discontinuous portion of the address t can be arbitrarily set, and FIG. 2 shows three typical pattern examples thereof. FIG. 2A shows an example of a pattern in which a discontinuous portion 2 is formed in a state where there is no sector area width. In the case of this pattern example, the address t for the discontinuous portion 2
Since there is no sector from 1'to address t2 ', discontinuity occurs in the address. In the case of this pattern example, as compared with the conventional general address setting shown in FIG. 6, the number of sectors in the area A1 is the address t1 'to t of the discontinuous portion 1.
Since it decreases by 2 ', 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 in which the address t is discontinuous is formed without reducing the number of available sectors in the area A1 and in the state where there is no area where the address t is unknown. can do.

FIG. 2B shows an example of a pattern in which the width of the area A1 'is provided in the physical arrangement direction of the sectors to form the discontinuous portion 3 where the address t is discontinuous from the address t1' to the address t2 '. Indicates. At this time, an arbitrary address tx can be set within the area A1 'of the discontinuous portion 2. Therefore, an arbitrary address tx for the discontinuous portion 2
By using the setting of, it is possible to form the discontinuous portion 3 where the addresses t are discontinuous while having additional information, for example, information such as the description of the type of medium.

FIG. 2C is an example of a pattern in which the discontinuous portion 4 is similar to the discontinuous portion 3 in the case of FIG. 2B, but the address t is set in the area A1 'where the discontinuous portion 4 is formed. The pattern is different in that it does not have. For example, assuming that the address is recorded by the wobble modulation of the pre-groove (guide groove), the address is given by a method of eliminating the wobble modulation, a method of eliminating the wobble itself, or a method of eliminating the pre-groove itself. You shouldn't. If you lose the pregroove itself,
If the area A1 'due to the discontinuous portion 4 is long, the prepit may be set in the area A1 to prevent the track deviation. At this time, the information 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 surely generated at the discontinuous portion 4 when recording is performed by the recording device of the low speed specification as described later.

By the way, the optical information recording medium 1 of the present embodiment has improved medium characteristics so as to enable high-speed recording, but in order to more reliably prevent recording by a low-speed recording apparatus. Is preferably set to have the following characteristics. That is, the wavelength λ = 789
nm, a CD optical pickup having 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, the minimum recording speed guaranteed by the medium ( It is preferable that the characteristics at the time of recording at a speed of 1/2 of the minimum relative speed between the recording apparatus and the medium capable of recording) Vmin, that is, V = 0.5 Vmin are as follows. In this case, as the recording signal, a recording signal having a longest mark length of 11T, which is a multi-pulse train by repeating a heating pulse and a cooling pulse as shown in FIG. 3, may be used. The recording power Pw is arbitrarily set, and the erasing power Pe is set to 0.5Pw. The degree of modulation m ₁₁ (= I ₁₁ / Rtop) (Rtop: information is written when the recording signal recorded on the optical information recording medium 1 under such conditions is reproduced by using the optical pickup used for recording. The maximum reflectance of the unmarked portion, I ₁₁ : the reflectance of the portion recorded with the longest mark length 11T) is measured, and the modulation 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 device 5 capable of recording on the optical information recording medium 1 compatible with high-speed recording as in this embodiment will be described with reference to FIG. Basically, a measure is taken so as not to be affected by the discontinuous points 2, 3 or 4 during the recording operation. Details of the recording device 5 will be omitted,
An optical pickup 7 provided with a laser light source for irradiating a recording or reproducing light beam onto an optical information recording medium 1 rotatably driven by a spindle motor 6, an objective lens, a light receiving element, etc., and detection of light reception by the optical pickup 7. A read signal processing unit 8 that extracts an address signal from the read signal that has been read, an address signal processing unit 9 that performs demodulation processing on the address signal obtained from the read signal processing unit 8, and this address signal processing unit An address discontinuity detecting section 10 as a detecting means for detecting the presence or absence of address discontinuity based on the output of 9 and the address discontinuity detecting section 1
An address correction unit 11 as a correction unit that performs a predetermined address correction when an address discontinuity is detected by 0.
And a recording device controller 12 for the laser light source in the optical pickup 7.

In such a structure, the optical information recording medium 1 which is rotationally driven is condensed and irradiated with the light beam by the optical pickup 7, and the reflected light is received by the light receiving element to read the signal. The read signal processing unit 8 extracts only the address signal from the read signal.
The extracted address signal is demodulated by the address signal processing unit 9 to specify the address of the portion currently irradiated with the light beam. At this time, in the case of the conventional low-speed specification recording apparatus that does not have the address discontinuity detection unit 10, tracking is performed when an address discontinuity occurs due to access to the discontinuous points 2, 3 or 4 in the access to the area A1. Since it is determined that the disconnection has occurred and an error signal is returned to the recording device control unit 12, it is not possible to shift to the subsequent processes, that is, trial writing and the original recording process. This prevents writing by a low speed recording device.

On the other hand, in the case of the recording device 5 of the present embodiment,
Since the address discontinuity detection unit 10 and the address correction unit 11 are provided and the address information regarding the discontinuity points 2, 3 or 4 in the area A1 of the optical information recording medium 1 is grasped in advance, the address in the area A1 is accessed. Even if a discontinuity occurs in the address discontinuity, the address discontinuity detection unit 10 recognizes that the address is discontinuous due to access to the discontinuous points 2, 3 or 4 and outputs it to the address correction unit 11. , The address correction unit 11 has discontinuous points 2, 3
Alternatively, the address correction is performed so that only the four addresses are skipped, and the address information is output to the recording device controller 12.
As a result, the trial writing process (setting of the recording power Pw) by accessing the area A1 is performed through the control of the recording device controller 12 without being affected by the discontinuity of the address due to the discontinuous portions 2, 3 or 4. Through area A
The original recording process for 3 and the like becomes possible.

In the reproducing process by the recording device and the reproducing device, regardless of the low speed specifications / high speed specifications, the area t is continuously set according to the physical arrangement of the sectors without accessing the area A1. , A3, so that playback can be performed without any trouble.

[0031]

EXAMPLES Examples of the present invention according to the above-described embodiment will be described.

<Example 1> A continuous guide groove (groove) was spirally formed on a transparent substrate made of polycarbonate to form C.
A D-RW substrate was prepared. Regarding the address information (ATIP) recorded in the guide groove, the following address t
At 1'and t2 ', the ATIP discontinuous discontinuous portion 2 having the pattern example as shown in FIG. 2A was formed 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. That is, this is an area in which 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 of the recording device during recording.

In addition, such a discontinuous portion 2 of the address
For areas other than the above, the ATIP information corresponding to the recording speed of 1 to 4 times (1X to 4X) of the normal reproduction speed of the compact disc conforming to the Orange Book Part III ver.2.0 which is the standard of CD-RW is recorded. did.

On such a transparent substrate 13, as shown in FIG. 5, a lower dielectric layer 14, a recording layer 15, and an upper dielectric layer 1 are formed.
6, the metal reflective layer 17, and the protective layer 18 were formed into the optical information recording medium 1. Lower dielectric layer 14 and upper dielectric layer 16
Is a mixture containing ZnS and SiO ₂ as main components,
The recording layer 15 is made of a phase change material containing AgInTeSb as a main component, and the metal reflection layer 17 is made of a material containing Al as a main component. In addition, the lower dielectric layer 14 and the upper dielectric layer 1
6 was formed by the RF sputtering method, and the recording layer 15 and the metal reflection layer 17 were formed by the DC sputtering method. The protective layer 18 is formed by coating UV curable resin by spin coating and then UV
It was cured by irradiation with light and formed.

The optical information recording medium 1 thus obtained
By using a CD-RW initialization device to initialize the CD, an unrecorded CD-RW medium could be obtained. The created media is a discontinuous part 2 where the above addresses are discontinuous.
Are formed in the PCA area.

As described above, a test was carried out as to whether or not the CD-RW medium having the discontinuous portion 2 where the addresses are discontinuous in the PCA area can be recorded by a commercially available (low speed specification) recording device. The recording device used for the test is the CD-R / RW drive MP-7060A manufactured by Ricoh Co., Ltd.
Is. When the created CD-RW medium was recorded using such a recording device, 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 described above is modified so as to add the address discontinuity detecting section 10 and the address correcting section 11 to perform the recording operation on the CD-RW medium (optical information recording medium 1), the discontinuity occurs. PCA according to point 2
Even if there is a discontinuity in the ATIP of the area, it is discontinuous 0
By correcting the address of 0:30: 00 by the address correcting unit 11, the recording operation such as the trial writing is performed without any problem, and the actual recording is subsequently started. In this way, recording can be performed by the recording apparatus 5 of the present embodiment, but recording cannot be performed on the optical information recording medium 1 according to the present embodiment by the conventional recording apparatus with the low speed specification. It has been confirmed.

<Embodiment 2> A CD as in Embodiment 1
-Created RW media. However, the composition ratio of the recording layer material was changed so that recording could be performed at a high speed of 4X to 8X. The prepared medium was measured using a CD-RW disc evaluation device DDU1000 (λ = 789 nm, NA = 0.50) at 8X (V = 9.6 m / s) and 4X (V = 4.8 m).
/ S) and 2X (V = 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 was determined according to the OPC method according to the Orange Book Part III ver. 2.0, which is a CD-RW standard.

The signal after recording is read at the reproduction speed X1,
When the modulation degree m was measured for each recording speed,
It is as follows.

8X: I ₁₁ /Itop=0.65 4X: I ₁₁ /Itop=0.56 2X: I ₁₁ /Itop=0.45 The recording signals at recording speeds 8X and 4X have sufficient modulation. However, the recording signal at a low speed as usual, such as 2X, has a low degree of modulation, which is less than 0.55 which is the minimum standard value of CD-RW. Therefore, it is understood that the medium cannot be recorded in the low speed specifications such as 2X.

Example 1 of such a CD-RW medium
When writing was attempted by a conventional printing apparatus that does not have the address discontinuity detection unit 10 used in the above, the same was discharged before printing.

[0043]

As described above, according to the present invention, the conventional low-speed recording apparatus cannot perform the recording as a result, and an error such as returning an OPC error can be generated in the trial writing recording, while the optical information recording medium is produced. Recording characteristics of V
It is possible to improve the recording characteristics when ≧ Vmin.

[Brief description of 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 sector number-address characteristic diagram illustrating three pattern examples of address discontinuities in the optical information recording medium according to the embodiment of the present invention.

FIG. 3 is a waveform diagram showing an example of a pattern of a recording signal.

FIG. 4 is a block diagram showing a schematic configuration of a recording device.

FIG. 5 is a sectional view showing an example of a sectional structure of an optical information recording medium.

FIG. 6 shows the number of sectors in a conventional general optical information recording medium-
It is an address characteristic diagram.

[Explanation of symbols]

1 Optical information recording medium, CD-R 13 Transparent substrate 14 Lower dielectric layer 15 recording layer 16 Upper dielectric layer 17 Metal reflective layer 18 Protective layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuyuki Yamada             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh F-term (reference) 5D029 JA01 LA17 MA13                 5D090 AA01 BB03 BB05 CC01 CC14                       DD02 EE11 JJ11 LL07

Claims (9)

[Claims] 1. An optical information recording medium in which information is recorded by irradiating light, wherein a recording speed of V = 0.5 Vmin with respect to a minimum recording speed Vmin guaranteed by the optical information recording medium. The degree of modulation when the longest mark is recorded on the optical information recording medium is
An optical information recording medium which is less than the minimum standard value of the optical information recording medium. 2. The optical information recording medium according to claim 1, wherein the minimum recording speed Vmin guaranteed by the optical information recording medium is four times the normal reproduction speed of a compact disc. 3. The minimum standard value of the optical information recording medium is
It is 0.55, The optical information recording medium of Claim 1 or 2 characterized by the above-mentioned. 4. The optical information recording medium according to claim 1, further comprising a lower dielectric layer, a recording layer, an upper dielectric layer, a metal reflection layer, and a protective layer on a transparent substrate. The optical information recording medium as described in any one of the above. 5. The optical information recording medium according to claim 4, wherein the recording layer contains AgInTeSb as a main component. 6. The lower dielectric layer and the upper dielectric layer
Is ZnS and SiO _Two Is the main component
6. The optical information recording medium according to claim 4 or 5. 7. The optical information recording medium according to claim 4, wherein the metal reflection layer contains Al as a main component. 8. The optical information recording medium according to claim 1, wherein the optical information recording medium is a phase change recording medium. 9. The optical information recording medium according to claim 1, wherein the optical information recording medium is a CD-R.