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WO2007013229A1 - Support d'enregistrement d'informations - Google Patents

Support d'enregistrement d'informations Download PDF

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Publication number
WO2007013229A1
WO2007013229A1 PCT/JP2006/311678 JP2006311678W WO2007013229A1 WO 2007013229 A1 WO2007013229 A1 WO 2007013229A1 JP 2006311678 W JP2006311678 W JP 2006311678W WO 2007013229 A1 WO2007013229 A1 WO 2007013229A1
Authority
WO
WIPO (PCT)
Prior art keywords
information recording
recording layer
visible information
recording medium
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/311678
Other languages
English (en)
Japanese (ja)
Inventor
Tomonori Nakada
Toshiyuki Kaneko
Hiroshi Yokota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Corp filed Critical Pioneer Corp
Priority to JP2007528368A priority Critical patent/JP4516125B2/ja
Publication of WO2007013229A1 publication Critical patent/WO2007013229A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G11B7/24056—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs
    • 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
    • G11B7/24094—Indication parts or information parts for identification

Definitions

  • the present invention relates to an information recording medium such as a 1 ⁇ disc (such as a CD, DVD, B 1 u-Ray, etc.) loaded in an optical disc apparatus or an optical card.
  • a 1 ⁇ disc such as a CD, DVD, B 1 u-Ray, etc.
  • a CD has a configuration of one 1.2 mm thick light transmitting substrate
  • a DVD has a configuration of two 0.6 mm thick light transmitting substrates bonded together.
  • a pair of disk bases having an information recording area on a transparent substrate are bonded to each other on the recording layer side.
  • This DVD has a multi-layer disc having a plurality of recording layers that can be read from one side of the disc, and a dual-layer disc having two recording layers on one side is put into practical use for reproduction only or for recording.
  • ROM-type optical discs include CDs and DVDs. CD-R, CD-RW, DVD-R, DVD-RW, DVD + R, DVD + RW, etc. There is.
  • L i ght Scri b e (registered trademark) is known.
  • a specific optical disk having a visible information recording layer formed on the label surface side can be set face down, and image information can be recorded using a data recording laser.
  • This method uses a CD laser to record visible information.
  • the CD has a data recording layer 3 at a substrate thickness of 1.2 mm on which the optical disk 10 is mounted.
  • the optical recording medium 10 is placed in contact with the turntable 12 (virtual plane including the contact surface 13 on the turntable 13), and the data recording layer 3 is focused on the substrate thickness exceeding 1.2 mm.
  • the position of the objective lens B of the picker is set to the working distance WD.
  • the optical disk when recording visible information (when recording is performed by irradiating the visible information recording layer 4 with laser light), the optical disk is turned over so that the substrate thickness is displaced by 1.2 mm from the setting (approximately the same as the reference plane 11). It is necessary to move the objective lens OB greatly in the focus direction so that it is in focus even at the same position.
  • a visible information recording layer is formed on the label surface side of the optical disk, and laser light modulated in accordance with image data such as characters and pictures is applied to the visible information recording layer.
  • image data such as characters and pictures
  • There are techniques for forming an image on a visible information recording layer by changing the visible light characteristics of the light see JP 2002-203321 A, JP 2004-55076 A, and JP 2003-203348 A). Disclosure of the invention
  • the CD recording layer and the visible information recording layer are positioned at a height different by 1.2 mm from the reference plane, and an image is formed on the visible information recording layer as shown in FIG.
  • the product height is greatly limited, so it is not easy to increase the stroke of the objective lens.
  • both recording layers will be 0.6 mm from the reference plane even when the optical disk is turned over. There is no need to change the position of the objective lens when recording visible information on the information recording layer.
  • JP 2002-203321, JP 2004 2-55076 and JP 2003- The technology disclosed in 2 0 3 3 4 8 does not mention the configuration of the optical disc from the viewpoint of the stroke of the objective lens of the pickup.
  • an adapter having a thickness of 1.2 mm that can be mounted on the chucking portion in the center of the optical disc
  • the present invention has been made in view of such a situation, and an object thereof is to provide an information recording medium capable of recording information on a visible information recording layer without increasing the stroke of an objective lens.
  • An information recording medium of the present invention is an information recording medium comprising: a light transmissive substrate; a reflective layer; and a data recording layer disposed between the substrate and the reflective layer,
  • a visible information recording layer provided on the opposite side of the data recording layer via the reflective layer; a reference surface including a contact surface for placing the visible information recording layer in contact with the visible information recording layer; And an optical distance adjusting unit that defines a distance between the information recording layer and the information recording layer.
  • FIG. 1 is a schematic partial cross-sectional view showing an objective lens and an optical disk for explaining the prior art.
  • FIG. 2 is a schematic partial cross-sectional view in the thickness direction of the recording optical disk according to the embodiment of the present invention.
  • FIG. 3 is a schematic partial sectional view showing an object lens and an optical disc for explaining the operation of the recording optical disc according to the embodiment of the present invention.
  • FIG. 4 is a schematic partial sectional view showing an optical disc according to an embodiment of the present invention.
  • 5 to 10 are schematic partial cross-sectional views showing optical disks according to other embodiments of the present invention.
  • FIG. 11 and FIG. 12 are schematic partial cross-sectional views showing an objective lens and an optical disc for explaining the operation of the recordable optical disc according to the embodiment of the present invention. Detailed Description of the Invention
  • FIG. 2 shows a cross section in the thickness direction of a recordable optical disc 1 such as CDR as an embodiment.
  • a data recording layer 3, a reflective layer 3a, and a visible information recording layer 4 are sequentially laminated on a light transmissive substrate 2, and a light transmissive cover substrate 5 is formed thereon. It is configured by pasting together.
  • the optical disc 1 may have a configuration in which a transparent layer or the like is provided between the reflective layer 3 a and the visible information recording layer 4.
  • These data recording layer 3, reflection layer 3a, visible information recording layer 4 and the like are collectively referred to as recording function layer 3 4.
  • the data recording layer 3 is a layer for recording data by irradiating a laser beam from the substrate 2 side.
  • the reflective layer 3a reflects the laser light irradiated from the visible information recording layer 4 side and the data recording layer 3 side.
  • the visible information recording layer 4 is a translucent layer whose reflectance changes, for example, when irradiated with laser light from the visible information recording layer 4 side of the optical disc 1.
  • the cover substrate 5 is a member that reverses the optical disc 1 to define the distance between the reference surface 11 and the visible information recording layer 4 and protects the visible information recording layer 4 from the outside. As shown in FIG.
  • the optical disc 1 is provided with a substrate hole CH that penetrates the substrate 2 and the cover-substrate 5 sandwiching the recording functional layer 3 4, and the cover substrate 5 has visible information around the periphery of the sensor hole CH.
  • a uniform thickness is provided so as to cover the recording layer 4.
  • the optical disk 1 is loaded into the spindle table turntable 1 2 through the center hall CH.
  • the optical disk 1 By turning the optical disk 1 over and irradiating the visible information recording layer 4 side with laser light, the laser light incident from the objective lens 0 B through the cover substrate 5 is reflected by the visible information recording layer 4 and the reflective layer 3 a.
  • the user can return to the objective lens OB, and the user can arbitrarily record image information such as characters and pictures in the visible information recording layer 4. Furthermore, the same effect can be obtained by using a DVD laser beam.
  • a polycarbonate disk having a radius of 60 mm is used as the base 2 and a center hole CH having a radius of 7.5 mm is formed at the center.
  • the clamp area CZ is between the radius 13 mm and the radius 16.5 mm
  • the image area IZ is between the radius 22 mm and the radius 59 mm, for example. Is set.
  • the optical disk 1 has a structure in which a substrate 2 having a thickness of 1.2 mm and a force-par substrate 5 having a thickness of 0.3 mm are bonded to each other, so that the entire thickness of the optical disk 1 is 1.5 mm, the upper limit of the CD standard.
  • the visible information recording layer 4 of the optical disc 1 without any significant configuration change in any recording device for DVD for CD.
  • the optical disc 1 is turned over so that the visible information recording layer 4 has visible information.
  • the visible information recording layer 4 is, for example, 0.3 mm from the reference surface 11 (a plane including the contact surface 13 to the turntable 12 for placing the optical disk 1 to contact).
  • the cover substrate 5 is positioned away from the thickness of the cover substrate 5.
  • the focal position can be moved by 0.3 mm, and there is no problem even with the stroke setting of the objective lens 0 B of the current machine. Even when a CD laser is used, the amount of movement of the focal point position decreases from 1.2 mm to 0.9 mm. That is, the cover substrate 5 serving as an optical distance adjusting unit is arranged so that the reference lens 11 from the reference surface 11 1 in the laser beam incident from the objective lens B through the reference surface 11 1 when recording on the visible information recording layer 4 is used. It has a thickness that reduces the optical distance to OB.
  • a cylindrical projection PT projecting from the surface of the visible information recording layer 4 is provided around the center hall CH to cover the entire surface of the optical disc 1.
  • the same effect can be obtained not by bonding the single substrate 5 but also by bonding only the data area such as the recording function layer 34.
  • the bonded part of the substrate is exposed inside the center hole CH. Therefore, there is a risk that incomplete chucking may occur when the ball chuck enters the bonded portion of the optical disk 1 in contrast to the self-checking spindle motor used in the thin optical disk 1 device.
  • the bonding is not exposed on the inner surface of the center hole CH, which is advantageous for an incomplete chuck.
  • the thicknesses of the substrate 2 and the cover substrate 5 of the optical disc 1 are not limited to the pair of thicknesses of 1.2 mm and 0.3 mm as long as they are within the CD thickness standard range. 1. It may be configured such as a pair of 1 mm-thick optical disc 1 base 2 and 0.4 mm-thick cover substrate 5 or a pair of 1.2 mm-thick optical disc 1 base 2 and 0.2 mm-thick cover substrate 5 .
  • the thickness of the cover substrate 5 can be selected from 0.1 to 0.4 mm, and the thickness of the substrate 2 can be selected from 1.1 to L: 4 mm. The thicker the cover substrate 5 is, the greater the effect is. However, the thickness on the CD recording layer 3 side must be at least 1.1 mm.
  • the upper limit of the thickness of the cover substrate 5 is 0.4 mm.
  • the thickness of the bonded substrate is “1 lmm + 0.4 mm”
  • the visible information recording layer 4 is positioned 0.4 mm from the reference surface 11 when the optical disk 1 is turned over.
  • the focal distance is 0.2 mm, which is more advantageous for the movement of the objective lens B.
  • the material of the cover substrate 5 is not limited to the poly force one point that is a CD substrate material.
  • the cover substrate 5 as the optical distance adjusting unit may be made of a material such as acrylic, glass material, or translucent ceramic as long as it can obtain an appropriate refractive index. At this time, the lower the refractive index material, the greater the effect of reducing the stroke of the objective lens B. Bonding the two substrates of the base 2 and the cover substrate 5 easily suppresses the warp of the optical disc 1.
  • the standard of surface blur due to warpage is ⁇ 0.5 mm for CD (one board) and ⁇ 0.3 mm for DVD (two boards bonded together). If you try to make the objective lens 0B follow the optical disc 1 with large surface blurring, If the required stroke becomes too large, the current pick-up will not be able to handle it, but this can be avoided with the substrate bonding structure.
  • the third embodiment as shown in FIG. 6, even if there is no actual cover substrate 5 that transmits light to the visible information recording layer 4, air having a value of 1 as the refractive index of light. Is ideal, so that it plays a role as an optical distance adjustment part that makes an air layer exist between the reference surface 11 and the visible information recording layer 4, so that the visible information recording layer 4 is surrounded around the center hole. Only the cylindrical protrusion PT is provided so as to protrude. Even in this case, the same effects as those of the above-described embodiment can be obtained. Further, in terms of refractive index, it is more advantageous than the cover substrate 5 as a substance having a value of 1 or more.
  • the optical distance adjustment unit may be a member having a thickness that reduces the optical distance from the reference surface 11 to the objective lens OB.
  • the thickness of the air layer on the image area IZ defined by the thickness of the base 2 and the protrusion PT (clamping area CZ) is “1 lmm + 0.4 mm”
  • the optical disk 1 is turned over. Since the position of the visible information recording layer 4 is 0.4 mm from the reference plane 11, the focal distance of the DVD laser is 0.2 mm, which is more advantageous for the movement of the objective lens OB.
  • a method ⁇ D-2> is possible in which a shape without a step (protrusion PT) is formed as in a normal recording optical disc 1, and a step (protrusion PT) is added in a later process. That is, the base 2 and the projecting portion PT can be formed separately and bonded to each other.
  • the current CD production process can be used as it is simply by correcting the mold. In addition, the risk of the incomplete chuck caused by the center-hole bonded portion can be prevented.
  • a concave portion DP having an inner diameter that is a dog than the outer shape of the protruding portion PT is provided on the opposite side of the protruding portion PT, it becomes more stable when a plurality of optical discs 1 are stacked and placed.
  • the concave portion is provided on the surface of the substrate 2 on the opposite side facing the protruding portion PT of the optical distance adjusting portion protruding from the surface of the visible information recording layer 4.
  • a step-shaped optical disk can be created without modifying the current mold. There is an advantage that it can be shared with other optical disc applications.
  • the method of adding the projecting portion PT later as in D 2> can be easily handled technically if, for example, the D VD optical disc 1 bonding method is employed.
  • the inner diameter d3 of the projecting portion PT is larger than the inner diameter d4 of the center hole CH, problems such as a clamping mistake in the self-chucking method due to the increase in the thickness of the optical disk 1 occur. Can be prevented. That is, the projecting portion PT projecting from the surface of the visible information recording layer 4 is provided with a through-opening that is concentric with the center hole CH and has a large diameter. This can be applied even when the projecting part PT of ⁇ D 1> is integrally formed.
  • a recess for fitting the spacer that forms the projecting portion PT of the optical distance adjusting portion in the base 2 is provided in advance. It is also possible to bond the chip later.
  • the thickness d 5 of the spacer forming the protrusion PT and the thickness d 6 of the bottom of the recess of the base 2 do not have to be 0.3 mm + 1.2 mm.
  • it may be, for example, 0.6 mm + 0.9 mm.
  • the same effect can be obtained by sandwiching a projecting portion PT having a thickness of 0.3 mm between the optical disk 1 and the reference surface 11 instead of changing the shape of the optical disk 1.
  • the slim drawer type optical disk apparatus is configured such that the chucking portion of the optical disk 1 is exposed to the reach of the user.
  • the protruding portion PT can be sandwiched between the evening table 12 and the optical disc 1.
  • the recording function to the visible information recording layer 4 can be realized only by the change on the recording medium side without mechanical change of the apparatus. As a result, the recording function to the visible information recording layer 4 can be easily added to existing devices on the market.
  • the part PT with a thickness of 0.77 mm is most advantageous.
  • the protrusion PT with a thickness of 0.77 mm is attached to the optical disc 1 (thickness 1.2 mm)
  • the total thickness of the optical disc 1 greatly exceeds 1.5 mm. In this case, the optical disk 1 cannot be chucked with the current apparatus.
  • the protrusion PT with a thickness of 0.39 mm is ideal, but this also exceeds the thickness standard (1.5 mm), so 0.3 mm
  • the following should be set (thickness 1.2 + 0.3 thickness 1.5 or less).
  • the objective lens OB of a device that records and reproduces CDs and DVDs must satisfy the following conditions as a minimum in a stroke away from the optical disc 1.
  • the focal position of the CD disc varies from 1.2 mm to 1.1 mm due to the influence of the disc disc surface blur of 0.5 mm and the effect when the thickness of the disc substrate 2 is minimal (thickness 1 mm).
  • the fluctuation amount is 0.065mm and the turntable / shaft adjustment variation is 0.05mm.
  • the inner periphery of the pick-up moves (radius from 59.5mm to 22mm)
  • the inclination is 0.03mm
  • the objective lens OB position With an adjustment amount of 0.08mm, the stroke amount of the objective lens ⁇ B when using a CD laser is approximately 0.675mm.
  • the amount of fluctuation of the focal point from 0.6 mm to 0.57 mm due to the influence of the surface deviation of the DVD disc of 0.3 mm and the minimum thickness of the disc substrate 2 (thickness 1.14).
  • the stroke of the objective lens OB when using the VD laser is estimated to be 0.43 mm.
  • the current pick-up is set based on the above dimensions.
  • a pick-up with this setting when focusing on the lower surface of the optical disk 1 for recording on the visible information recording layer 4, the stroke required to cope with surface blurring of the optical disk 1 is insufficient.
  • FIG. 11 is a cross-sectional view for explaining the stroke of the objective lens OB (working distance 0.85 mm) when the CD laser is used for various optical disks 1.
  • CD recording Z playback is normally performed at the OB position of the objective lens WD with a working distance WD.
  • the objective lens ⁇ B is set to move 0.80 mm as the stroke lower limit LL from the position of the working distance WD.
  • the refractive index of polycarbonate (PC) which is the material of the optical disk 1 substrate 2
  • the conventional technology flips it over to the visible information recording layer 4.
  • the optical disc 1 of the first embodiment is turned over and used.
  • the visible information recording layer 4 has a height of 0.3 mm from the reference plane 11. Therefore, the objective lens B can be raised, and the cover substrate 5 can be If the disk 1 is made of the same material as the substrate 2 (for example, polycarbonate), the objective lens B can be set at a position c higher than the position b, as shown in FIG. 11 (c).
  • the cover substrate 5 adjusts the optical distance to reduce the optical distance from the reference surface 11 to the objective lens OB.
  • FIG. 11 (d) shows the third embodiment.
  • the 0.3 mm cover substrate 5 is replaced with air, and the air is considered to have a refractive index of 1, so the lens position in this case is a position d 0.47 mm below the working distance WD. .
  • FIG. 11 (e) shows a modification of the first embodiment.
  • the thickness of the cover substrate 5 is set to 0.4 mm.
  • the objective lens B becomes a position e that is 0.06 mm more advantageous than that in the embodiment of FIG. 11 (c).
  • the material of the cover substrate 5 is changed, and a material with a lower refractive index is selected.
  • a material with a lower refractive index is selected.
  • the cover substrate 5 material with a thickness of 0.4 mm is replaced with a low-refractive index material (such as a fluorine-based polymer coating) from polycarbonate, the stroke of the objective lens 0B is further reduced by 0.036 mm (refractive index 1.55 to 1. 36)).
  • FIG. 12 shows a cross-sectional view of FIG.
  • the objective lens ⁇ B position (working distance 1.22 mm) when using a DVD laser is lower than the position when using a CD laser.
  • the lens position is at position d 0.39mm below the working distance WD, but in Figs. 12 (h) (i) and (j), the working distance is 0. 19mm, 0.09mm, 0.13mm down to position d. Even in these cases, the moving stroke of the objective lens B can be suppressed by applying this embodiment.
  • the thickness of cover substrate 5 (the material is polycarbonate) is 0 when using a CD laser.
  • the same effect can be obtained even if the thickness is as thin as 0.15 mm.
  • Substrate bonding technology has been put to practical use on DVDs, and can be produced at low cost without significantly modifying existing production equipment.
  • the optical disc 1 used in the prior art exposes the visible information recording layer 4 to the outside of the optical disc 1 (visible information recording layer 4 side), so there is a risk of damage to the recording layer due to external scratches. is there.
  • the visible information recording layer 4 is also protected against damage from the outside by bonding the cover substrate 5 as in the present embodiment.
  • the substrate bonding technique is applied not only to the CD family 1 but also to the DVD family 1 or the B 1 u-Ray family, or the optical disc 1 center.
  • the recording function for the visible information recording layer 4 can be realized without significant changes to the current recording device.
  • an optical disc having one data recording layer 3 is used.
  • the present invention can also be applied to a multi-layer disc such as a double-layer disc having two recording layers on one side.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

La présente invention concerne un support d'enregistrement d'informations équipé d'un corps de base transmettant la lumière, d'une couche réfléchissante, et d'une couche d'enregistrement de données disposée entre le corps de base et la couche réfléchissante. Le support d'enregistrement d'informations est également pourvu d'une couche d'enregistrement d'informations visibles, disposée du côté opposé à la couche d'enregistrement de données à travers la couche réfléchissante, et d'une section d'ajustement de distance optique qui spécifie une distance entre un plan de référence, dont le but est de positionner le support d'enregistrement d'informations de sorte qu'il touche le côté de la couche d'enregistrement d'informations visibles, et la couche d'enregistrement d'informations visibles.
PCT/JP2006/311678 2005-07-26 2006-06-05 Support d'enregistrement d'informations Ceased WO2007013229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007528368A JP4516125B2 (ja) 2005-07-26 2006-06-05 情報記録媒体

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-215497 2005-07-26
JP2005215497 2005-07-26

Publications (1)

Publication Number Publication Date
WO2007013229A1 true WO2007013229A1 (fr) 2007-02-01

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Application Number Title Priority Date Filing Date
PCT/JP2006/311678 Ceased WO2007013229A1 (fr) 2005-07-26 2006-06-05 Support d'enregistrement d'informations

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JP (1) JP4516125B2 (fr)
WO (1) WO2007013229A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000173096A (ja) * 1998-12-10 2000-06-23 Mitsui Chemicals Inc 光記録媒体
JP2002367234A (ja) * 2001-06-04 2002-12-20 Toshiba Corp 光ディスクならびにその光ディスクに適した光ディスク装置および情報記録再生方法
JP2004103180A (ja) * 2002-09-12 2004-04-02 Mitsubishi Chemicals Corp 光情報記録媒体
JP2004247031A (ja) * 2003-01-24 2004-09-02 Mitsubishi Chemicals Corp 情報記録媒体
JP2004310937A (ja) * 2003-04-09 2004-11-04 Ricoh Co Ltd ディスク基板製造装置およびその製造方法、ディスク基板成形用スタンパの製造装置およびその製造方法、ディスク基板およびその製造方法、貼り合わせ型光情報記録媒体およびその製造方法
JP2004319061A (ja) * 2003-04-17 2004-11-11 Princo Corp 光ディスク基板、光ディスク及びその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000173096A (ja) * 1998-12-10 2000-06-23 Mitsui Chemicals Inc 光記録媒体
JP2002367234A (ja) * 2001-06-04 2002-12-20 Toshiba Corp 光ディスクならびにその光ディスクに適した光ディスク装置および情報記録再生方法
JP2004103180A (ja) * 2002-09-12 2004-04-02 Mitsubishi Chemicals Corp 光情報記録媒体
JP2004247031A (ja) * 2003-01-24 2004-09-02 Mitsubishi Chemicals Corp 情報記録媒体
JP2004310937A (ja) * 2003-04-09 2004-11-04 Ricoh Co Ltd ディスク基板製造装置およびその製造方法、ディスク基板成形用スタンパの製造装置およびその製造方法、ディスク基板およびその製造方法、貼り合わせ型光情報記録媒体およびその製造方法
JP2004319061A (ja) * 2003-04-17 2004-11-11 Princo Corp 光ディスク基板、光ディスク及びその製造方法

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JP4516125B2 (ja) 2010-08-04
JPWO2007013229A1 (ja) 2009-02-05

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