WO2012101800A1 - 光ディスク - Google Patents
光ディスク Download PDFInfo
- Publication number
- WO2012101800A1 WO2012101800A1 PCT/JP2011/051574 JP2011051574W WO2012101800A1 WO 2012101800 A1 WO2012101800 A1 WO 2012101800A1 JP 2011051574 W JP2011051574 W JP 2011051574W WO 2012101800 A1 WO2012101800 A1 WO 2012101800A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical disk
- region
- coating film
- optical disc
- substrate
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24047—Substrates
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/24097—Structures for detection, control, recording operation or replay operation; Special shapes or structures for centering or eccentricity prevention; Arrangements for testing, inspecting or evaluating; Containers, cartridges or cassettes
Definitions
- the present invention relates to an optical disc on which information can be recorded or reproduced by irradiation with a light beam, and is particularly applicable to an optical disc having a thick coating film formed on an optical disc substrate.
- FIGS. 1-10 Conventionally, as a centering method for clamping an optical disc, for example, there are methods shown in FIGS.
- the method shown in FIG. 1 is a centering method (hereinafter also referred to as a first method) using a clamp mechanism in which a tapered centering protrusion 22 is provided at the center of a disk table 21 on which the optical disk 1 is placed.
- a centering method hereinafter also referred to as a first method
- the inner peripheral edge 1a (lower edge) of the center hole of the optical disc 1 is regulated by being in contact with the tapered surface 22a of the centering protrusion 22, whereby the optical disc 1 is centered.
- the optical disc 1 is clamped to a support portion 21 a of a disc table 21.
- the system shown in FIG. 2 is a centering system (hereinafter referred to as a centering system) using a clamp mechanism in which a plurality of engaging claws 23 are formed on the outer peripheral surface of a centering protrusion 22 provided at the center of a disk table 21 on which the optical disk 1 is placed.
- a centering system using a clamp mechanism in which a plurality of engaging claws 23 are formed on the outer peripheral surface of a centering protrusion 22 provided at the center of a disk table 21 on which the optical disk 1 is placed.
- the second method also called the second method.
- the inner peripheral edge 1 a (lower edge) of the center hole of the optical disk 1 is engaged with the engaging claw 23 of the centering protrusion 22.
- the optical disk 1 is centered.
- the optical disc 1 shown in FIGS. 1 and 2 is, for example, a BD (Blu-ray Disc), 3 is a disc substrate, and 4 is a coating film 4 made of a cover layer or the like.
- BD Blu-ray Disc
- the coating film 4 is thicker than the conventional thickness (for example, 100 ⁇ m for BD). Therefore, if the protrusion of the centering protrusion 22 is small as shown in FIG. Since the clamp area of the optical disc 1A comes into contact with the support portion 21a before the la comes into contact with the tapered surface 22a, a gap may be formed between the inner peripheral edge 1a and the tapered surface 22a, which may cause a problem that centering cannot be performed.
- the coating film 4 is thicker than the conventional thickness (for example, 100 ⁇ m for BD), so that the inner peripheral edge 1a is engaged with the engaging claw 23 as shown in FIG. Since they do not match, there may be a problem that centering cannot be performed.
- the optical disk having a thick coating film 4 formed on the disk substrate 3 has a large difference in height between the inner peripheral edge of the optical disk 1 and the clamp area. Further, there is a possibility that stable centering cannot be performed with respect to an optical disk having a thick coating film 4 as compared with the conventional art, and the eccentricity becomes large.
- the present invention has been made in view of the above circumstances, and as an example of the problem, stable centering is performed by the centering method of the conventional clamp mechanism even if the coating film is thicker than the conventional optical disk. It is in.
- one aspect of the present invention is an optical disc comprising a disc-shaped optical disc substrate and a coating film formed on the optical disc substrate, wherein the optical disc substrate has an innermost circumference.
- the thickness of the optical disk substrate in the first area is higher than the thickness of the optical disk substrate in the second area, and after the coating film is formed, the second area.
- the total thickness of the optical disc substrate and the coating film in the region is an optical disc having a height equal to or greater than the thickness of the optical disc substrate in the first region.
- FIG. 1 is a schematic cross-sectional view of an optical disc according to an embodiment of the present invention. It is a figure which shows the effect
- FIG. 9 is a cross-sectional view showing the AA cross section of FIG. 8.
- FIG. 5 is a schematic cross-sectional view of the optical disc 2 according to the embodiment of the present invention.
- the optical disc 2 is an optical disc in which the coating film 4 is thicker than a conventional thickness (for example, 100 ⁇ m for BD).
- a next-generation disc having a multi-layered recording layer is assumed.
- the optical disc 2 includes an optical disc substrate 3 that is a disc-shaped transparent substrate in which a central hole 201 penetrating in the center is formed, and a coating film 4 formed on one main surface of the optical disc substrate 3 by a spin coating method. Prepare.
- one main surface of the optical disk substrate 3 is a first region S1 having an annular protrusion 202 formed on the inner peripheral side including the innermost periphery, and a region outside the first region.
- the clamp area C placed on the support portion 21a of the disk table 21 when the optical disk 2 is clamped is positioned 22 mm to 33 mm from the innermost peripheral position, and is positioned in the second area S2 in the present embodiment. .
- the thickness TB of the optical disk substrate 3 in the first region S1 is higher than the thickness TA of the optical disk substrate 3 in the second region S2. That is, in the optical disc 2 before the coating film 4 is formed, the relationship TB> TA is established.
- the thickness T3 is preferably in the range of 0 to 200 ⁇ m from the experiment result of the inventor.
- the optical disc 2 of the present embodiment is a highly compatible optical disc that can be applied to an existing optical disc drive apparatus.
- FIG. 6 shows the centering state of the optical disc 2 in the case of the first method.
- the inner peripheral edge 2a is regulated by contacting the tapered surface 22a, so that the optical disc 2 can be centered. is there.
- FIG. 7 shows how the optical disc 2 is centered in the case of the second method. Also in this case, as shown in FIG. 7, even if the coating film 4 is thicker than the conventional one, the inner peripheral edge 2a is engaged and regulated by the engaging claw 23, so that the optical disc 2 can be centered. Is possible.
- a concave stamper pressing claw portion 203 is formed on the optical disk substrate 3, and the protrusion 202 of the optical disk substrate 2 and the coating film 4 are not adjacent to each other.
- the configuration of the optical disc 2 is not limited to this.
- the optical disc substrate 3 may be a flat optical disc substrate 3 that does not have the concave stamper pressing claw portion 203, that is, has no recess.
- the protrusion 202 is formed between the innermost peripheral position and the inside of the clamp region C in both cases where the concave stamper pressing claw 203 is formed on the optical disc substrate 3 and when it is not formed. preferable.
- FIG. 8 is a perspective view of an optical disk having a multilayer structure which is an example of the optical disk 2.
- FIG. 9 is a cross-sectional view taken along line AA in FIG.
- the optical disk 2 is a multilayer optical disk as a multilayer recording medium using a refractive index change type multiphoton absorption material for a plurality of recording layers laminated in the film thickness direction.
- the optical disc 2 includes a cover layer 13, a guide layer 11, a wavelength selective reflection film 9 for reflecting the servo light beam SB, a recording layer group 50, an optical disc substrate (holding substrate) from the incident side of the main light beam MB and the servo light beam SB. ).
- the coating film 4 shown in FIGS. 5 to 7 corresponds to the cover layer 13, the guide layer 11, the reflective wavelength-selective reflective film 9, and the recording layer group 50.
- the cover layer 13 is made of an organic or inorganic light-transmitting material such as a transparent resin material, and has a function of flattening the laminated structure and protecting the recording layer group 50 and the like.
- the guide layer 11 is a layer having a track T provided for detecting the focusing and tracking servo signals of the servo light beam SB.
- the recording layer group 50 is a stack of a plurality of recording layers 5 each recording information.
- the reflective wavelength-selective reflective film 9 between the guide layer 11 and the recording layer group 50 reflects a servo light beam SB having a wavelength different from that of the main light beam MB (first wavelength, for example, a wavelength longer than the main light beam) and It is set to transmit the main light beam MB (second wavelength).
- first wavelength for example, a wavelength longer than the main light beam
- second wavelength the reflective wavelength selective reflection film 9 can be omitted.
- a recording mark RM) is recorded.
- the objective lens OB having a predetermined numerical aperture irradiates a condensed beam and collects reflected light from the recording layer group 50.
- the condensed beam is irradiated from the cover layer 13 side in order to write or read a signal from any recording layer of the recording layer group 50, and information is recorded and reproduced.
- the optical disk substrate (protective substrate) 3 is made of, for example, glass, polycarbonate, amorphous polyolefin, polyimide, plastic such as PET, PEN, PES, or ultraviolet curable acrylic resin.
- a multi-layered optical disk has been described as an example of the optical disk 2, but the optical disk 2 of the present invention is not limited to this.
- the coating film 4 is an optical disk that is thicker than the conventional one, it may have any structure, for example, a single-layer optical disk.
- the optical disc 2 includes the disc-shaped optical disc substrate 3 and the coating film 4 formed on the optical disc substrate 3, and one main surface of the optical disc substrate 3 is The first region S1 including the innermost periphery, in which the protrusion 202 is formed in the entire region, and the second region S2 in which the coating film 4 is formed, which is a region outside the first region S1.
- the thickness TB of the optical disk substrate 3 in the first region S1 is higher than the thickness TA of the optical disk substrate 3 in the second region S2, and the coating film 4 Is formed, the total thickness TA + T1 of the optical disc substrate 3 and the coating film 4 in the second region S2 is equal to or higher than the thickness TB of the optical disc substrate 3 in the first region S1.
- the difference T3 between the thickness of the optical disk substrate 3 and the coating film 4 in the second region S2 and the thickness of the optical disk substrate 3 in the first region S1 is 0 to 200 ⁇ m. Preferably there is.
- T3 is set to a suitable value, so that the inner peripheral part of the optical disk 2 where the protrusion 202 is formed and the outer peripheral part of the coating film 4 are formed.
- the difference in height can be reduced, and stable centering can be achieved.
- clamp area C supported by the optical disk drive device is located in the second area S2.
- a concave stamper pressing claw portion 203 is formed between the first region S1 and the second region S2, and the protrusion 202 in the first region S1 and the coating film 4 in the second region S2 are adjacent to each other. Preferably not.
- the optical disc substrate 3 is suitable for the optical disc 2 in which the stamper pressing claw portion 203 is formed.
Abstract
Description
図5は、本発明の実施の形態に係る光ディスク2の概略断面図である。光ディスク2は、塗膜4が従来の厚さ(例えば、BDでは100μm)に比べて厚い光ディスクであり、例えば、記録層が多層化された次世代ディスクなどが想定される。
図8は、光ディスク2の一例である多層構造の光ディスクの斜視図である。図9は図8の線AAの断面図である。光ディスク2は、膜厚方向において積層された複数の記録層に屈折率変化タイプの多光子吸収材料を利用した多層記録媒体としての多層光ディスクである。光ディスク2は、メイン光ビームMB及びサーボ光ビームSBの入射側から、カバー層13、ガイド層11、サーボ光ビームSBの反射用波長選択性反射膜9、記録層群50、光ディスク基板(保持基板)3からなる。ここで、図5~図7で示した塗膜4は、カバー層13、ガイド層11、反射用波長選択性反射膜9、及び記録層群50に相当する。
3 光ディスク基板
4 塗膜
201 中心孔
202 突起部
203 スタンパ押さえ爪部
S1 第1領域
S2 第2領域
S3 第3領域
TA 光ディスク基板の外周部の厚さ
TB 光ディスク基板の内周部の厚さ
T1 塗膜の厚さ
T2 突起部の高さ
T3 光ディスクの内周部と外周部の厚さの差
C クランプ領域
Claims (4)
- 円盤状の光ディスク基板と、前記光ディスク基板上に形成された塗膜と、を備えた光ディスクであって、
前記光ディスク基板は、
最内周を含む領域であって、領域全体に突起部が形成された第1領域と、
前記第1領域の外側の領域であって、前記塗膜が形成される第2領域と、
を含み、
前記塗膜が形成される前において、前記第1領域における前記光ディスク基板の厚さは、前記第2領域における前記光ディスク基板の厚さよりも高く、かつ、前記塗膜が形成された後において、前記第2領域における前記光ディスク基板と前記塗膜を合わせた厚さは、前記第1領域における前記光ディスク基板の厚さ以上の高さである光ディスク。 - 前記塗膜が形成された後において、前記第2領域における前記光ディスク基板と前記塗膜を合わせた厚さと、前記第1領域における前記光ディスク基板の厚さの差は、0~200μmである請求項1記載の光ディスク。
- 光ディスクドライブ装置に支持されるクランプ領域は、前記第2領域に位置している請求項1又は2記載の光ディスク。
- 前記第1領域と前記第2領域の間には、凹部が形成されており、前記第1領域の前記突起部と前記第2領域の前記塗膜は隣接していない請求項1乃至3のいずれか1項に記載の光ディスク。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/981,528 US20130337216A1 (en) | 2011-01-27 | 2011-01-27 | Optical disc |
PCT/JP2011/051574 WO2012101800A1 (ja) | 2011-01-27 | 2011-01-27 | 光ディスク |
JP2012554582A JP5484600B2 (ja) | 2011-01-27 | 2011-01-27 | 光ディスク |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2011/051574 WO2012101800A1 (ja) | 2011-01-27 | 2011-01-27 | 光ディスク |
Publications (1)
Publication Number | Publication Date |
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WO2012101800A1 true WO2012101800A1 (ja) | 2012-08-02 |
Family
ID=46580403
Family Applications (1)
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PCT/JP2011/051574 WO2012101800A1 (ja) | 2011-01-27 | 2011-01-27 | 光ディスク |
Country Status (3)
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US (1) | US20130337216A1 (ja) |
JP (1) | JP5484600B2 (ja) |
WO (1) | WO2012101800A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006301171A (ja) * | 2005-04-19 | 2006-11-02 | Fuji Photo Film Co Ltd | 光記録媒体及びその製造方法、並びに、光記録媒体の記録方法及び光記録媒体の再生方法 |
WO2007135907A1 (ja) * | 2006-05-18 | 2007-11-29 | Panasonic Corporation | 多層光記録媒体の製造方法 |
JP2008146726A (ja) * | 2006-12-07 | 2008-06-26 | Fujifilm Corp | 光情報記録媒体、基板、スタンパ、金型及び光情報記録媒体の製造方法 |
JP2008282525A (ja) * | 2008-07-01 | 2008-11-20 | Hitachi Maxell Ltd | 光ディスクの製造方法 |
JP2009064510A (ja) * | 2007-09-06 | 2009-03-26 | Ricoh Co Ltd | 光記録媒体用の基板、スタンパ、及び光記録媒体用の基板の製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002170279A (ja) * | 2000-11-30 | 2002-06-14 | Sony Corp | 光学記録媒体およびその製造方法、ならびに射出成形装置 |
JP2007265515A (ja) * | 2006-03-28 | 2007-10-11 | Canon Inc | 光記録媒体及びその製造方法 |
-
2011
- 2011-01-27 WO PCT/JP2011/051574 patent/WO2012101800A1/ja active Application Filing
- 2011-01-27 JP JP2012554582A patent/JP5484600B2/ja not_active Expired - Fee Related
- 2011-01-27 US US13/981,528 patent/US20130337216A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006301171A (ja) * | 2005-04-19 | 2006-11-02 | Fuji Photo Film Co Ltd | 光記録媒体及びその製造方法、並びに、光記録媒体の記録方法及び光記録媒体の再生方法 |
WO2007135907A1 (ja) * | 2006-05-18 | 2007-11-29 | Panasonic Corporation | 多層光記録媒体の製造方法 |
JP2008146726A (ja) * | 2006-12-07 | 2008-06-26 | Fujifilm Corp | 光情報記録媒体、基板、スタンパ、金型及び光情報記録媒体の製造方法 |
JP2009064510A (ja) * | 2007-09-06 | 2009-03-26 | Ricoh Co Ltd | 光記録媒体用の基板、スタンパ、及び光記録媒体用の基板の製造方法 |
JP2008282525A (ja) * | 2008-07-01 | 2008-11-20 | Hitachi Maxell Ltd | 光ディスクの製造方法 |
Also Published As
Publication number | Publication date |
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JP5484600B2 (ja) | 2014-05-07 |
US20130337216A1 (en) | 2013-12-19 |
JPWO2012101800A1 (ja) | 2014-06-30 |
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