IT1249470B - Foglio di sostrato per un mezzo di registrazione ottica, e metodo e dispositivo per la sua formatura. - Google Patents
Foglio di sostrato per un mezzo di registrazione ottica, e metodo e dispositivo per la sua formatura.Info
- Publication number
- IT1249470B IT1249470B ITRM910866A ITRM910866A IT1249470B IT 1249470 B IT1249470 B IT 1249470B IT RM910866 A ITRM910866 A IT RM910866A IT RM910866 A ITRM910866 A IT RM910866A IT 1249470 B IT1249470 B IT 1249470B
- Authority
- IT
- Italy
- Prior art keywords
- resin
- sheet
- forming
- roller
- optical recording
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/14—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length
- B29C39/148—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D17/00—Producing carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records; Producing record discs from master stencils
- B29D17/005—Producing optically read record carriers, e.g. optical discs
- B29D17/007—Forming the relief pattern on a support larger than the record
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0014—Extrusion moulding in several steps, i.e. components merging outside the die producing flat articles having components brought in contact outside the extrusion die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/008—Tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
- B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
- B32B2310/0831—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using UV radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
- B32B2310/0875—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation
- B32B2310/0887—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Viene reso noto un metodo per la formatura di un foglio di sostrato per mezzi di registrazione ottica avente un preformato sulla superficie. Questo metodo comprende gli stadi di estrudere una resina fusa per formare un foglio di resina fusa, pressare il foglio di resina fusa tra un rullo a specchio ed un rullo di resina prima dell'indurimento del foglio di resina fusa, con ciò formando un foglio di resina, il rullo di resina essendo disposto di fronte al rullo a specchio ed essendo ricoperto sulla superficie periferica di esso con una resina, e di formare uno strato di composizione di resina fotoinduribile sulla superficie del foglio di resina con cui il rullo di resina è venuto in contatto e formando il preformato sullo strato di composizione di resine fotoinduribile.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30872490 | 1990-11-16 |
Publications (3)
Publication Number | Publication Date |
---|---|
ITRM910866A0 ITRM910866A0 (it) | 1991-11-15 |
ITRM910866A1 ITRM910866A1 (it) | 1993-05-15 |
IT1249470B true IT1249470B (it) | 1995-02-23 |
Family
ID=17984523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITRM910866A IT1249470B (it) | 1990-11-16 | 1991-11-15 | Foglio di sostrato per un mezzo di registrazione ottica, e metodo e dispositivo per la sua formatura. |
Country Status (3)
Country | Link |
---|---|
US (1) | US5281371A (it) |
JP (1) | JP3072797B2 (it) |
IT (1) | IT1249470B (it) |
Families Citing this family (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5527497A (en) * | 1992-11-26 | 1996-06-18 | Canon Kabushiki Kaisha | Process and apparatus for manufacturing substrate sheet for optical recording mediums, and process for preparing stamper |
KR100230245B1 (ko) * | 1995-01-24 | 1999-11-15 | 윤종용 | 다층 광 기록 매체의 제조방법 및 그 장치 |
US5735988A (en) * | 1996-03-19 | 1998-04-07 | Physical Optics Corporation | Method of making liquid crystal display system |
ATE209098T1 (de) * | 1996-06-26 | 2001-12-15 | Idemitsu Petrochemical Co | Verfahren zum musterprägen einer folie und vorrichtung zur musterprägung |
CN1217359A (zh) * | 1997-11-14 | 1999-05-26 | 通用电气公司 | 热塑性涂料组合物 |
SG75890A1 (en) * | 1997-11-14 | 2000-10-24 | Gen Electric | Finishing roll sleeve for extruded thermoplastic film |
SG71168A1 (en) * | 1997-11-14 | 2000-03-21 | Gen Electric | Method for producing textured thermoplastic film |
US6855415B2 (en) | 1997-11-14 | 2005-02-15 | General Electric Company | Coated thermoplastic film substrate |
DE19906008A1 (de) * | 1999-02-15 | 2000-08-17 | Binder Kletten Haftverschlus S | Verfahren und Vorrichtung zur Herstellung von Haftverschlußteilen aus strahlengehärteten Kunststoffen |
US7230764B2 (en) * | 2000-08-18 | 2007-06-12 | Reflexite Corporation | Differentially-cured materials and process for forming same |
US7250122B2 (en) * | 2000-08-18 | 2007-07-31 | Reflexite Corporation | Differentially cured materials and process for forming same |
US20040190102A1 (en) * | 2000-08-18 | 2004-09-30 | Mullen Patrick W. | Differentially-cured materials and process for forming same |
US6533884B1 (en) | 2000-11-03 | 2003-03-18 | Printpack Illinois, Inc. | Method and system for extrusion embossing |
ITMI20012075A1 (it) * | 2001-10-08 | 2003-04-08 | Consiglio Nazionale Ricerche | Procedimento per il conferimento e controllo su scale micro e nanomatriche dell'anisotropia di proprieta' strutturali elettriche ottiche ed |
DE10158347A1 (de) * | 2001-11-28 | 2003-06-12 | Tesa Ag | Verfahren zur Erzeugung von nano- und mikrostrukturierten Polymerfolien |
JP2004273079A (ja) * | 2003-03-12 | 2004-09-30 | Fuji Photo Film Co Ltd | 光情報記録媒体用透明シート、その製造方法、及び光情報記録媒体 |
US20050151283A1 (en) * | 2004-01-08 | 2005-07-14 | Bajorek Christopher H. | Method and apparatus for making a stamper for patterning CDs and DVDs |
CA2553837C (en) * | 2004-01-21 | 2012-10-16 | Microcontinuum, Inc. | Pre-formatted linear optical data storage medium |
US9307648B2 (en) | 2004-01-21 | 2016-04-05 | Microcontinuum, Inc. | Roll-to-roll patterning of transparent and metallic layers |
US7959976B2 (en) * | 2004-10-05 | 2011-06-14 | Sabic Innovative Plastics Ip B.V. | Coated film and method of making the same |
WO2007100849A2 (en) | 2006-02-27 | 2007-09-07 | Microcontinuum, Inc. | Formation of pattern replicating tools |
US20100213626A1 (en) * | 2007-09-12 | 2010-08-26 | Chien-Cheng Lin | Diffusion film light diffusion structure molding process and installation thereof |
KR101034708B1 (ko) * | 2009-02-09 | 2011-05-17 | 삼성모바일디스플레이주식회사 | 롤러 타입 스템퍼 |
US9271879B2 (en) * | 2009-03-13 | 2016-03-01 | The Procter & Gamble Company | Article having a seal and process for forming the same |
US8585958B2 (en) | 2009-03-13 | 2013-11-19 | The Procter & Gamble Company | Process for making an embossed web |
US8206628B2 (en) | 2009-03-13 | 2012-06-26 | The Procter & Gamble Company | Process for making an embossed web |
EP2406059A1 (en) | 2009-03-13 | 2012-01-18 | The Procter & Gamble Company | Article having a seal and process for forming the same |
US8926890B2 (en) | 2009-03-13 | 2015-01-06 | The Procter & Gamble Company | Process for making an embossed web |
US8585951B2 (en) * | 2009-03-13 | 2013-11-19 | The Proctor & Gamble Company | Process for making an embossed web |
BR112012021780A2 (pt) * | 2010-03-11 | 2016-05-17 | Procter & Gamble | processo para fabricação de uma manta gofrada |
US9079324B2 (en) * | 2010-03-11 | 2015-07-14 | The Procter & Gamble Company | Process for making a film/nonwoven laminate |
US9724245B2 (en) | 2011-04-26 | 2017-08-08 | The Procter & Gamble Company | Formed web comprising chads |
JP5910056B2 (ja) * | 2011-12-13 | 2016-04-27 | 富士ゼロックス株式会社 | レンズ製造装置 |
US9589797B2 (en) | 2013-05-17 | 2017-03-07 | Microcontinuum, Inc. | Tools and methods for producing nanoantenna electronic devices |
CN103640225B (zh) * | 2013-11-21 | 2015-12-30 | 曾浩 | 一种塑性板的成形装置及其制造方法 |
US20150360413A1 (en) * | 2014-06-12 | 2015-12-17 | Northern Engraving Corporation | System and Method of Forming Machined Surface Finish On Polycarbonate Material |
WO2016031675A1 (ja) * | 2014-08-27 | 2016-03-03 | 旭硝子株式会社 | 絶縁電線及びその製造方法 |
JP6741440B2 (ja) * | 2016-02-29 | 2020-08-19 | 住友化学株式会社 | 積層光学フィルムの製造方法、及び積層光学フィルムの製造装置 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3072519A (en) * | 1958-08-29 | 1963-01-08 | Allied Record Mfg Co | Method of making phonograph record blanks from composite material |
US3893795A (en) * | 1970-08-20 | 1975-07-08 | Rowland Dev Corp | Embossing rolls with areas of differential hardness |
US3839514A (en) * | 1970-08-20 | 1974-10-01 | Rowland Dev Corp | Method of embossing thermoplastic sheet using a roll having a surface of varying hardness |
US3751550A (en) * | 1970-08-20 | 1973-08-07 | Rowland Dev Corp | Method for making differential durometer faced rolls |
US4211743A (en) * | 1978-05-24 | 1980-07-08 | Nauta Roll Corporation | Apparatus and method for embossing web material |
JPS5930247A (ja) * | 1982-08-12 | 1984-02-17 | Fuji Photo Film Co Ltd | 磁気記録媒体の表面平滑化方法 |
EP0168530B1 (en) * | 1984-07-05 | 1990-04-04 | Docdata N.V. | Method and apparatus for reproducing relief structures onto a substrate |
US4790893A (en) * | 1984-07-19 | 1988-12-13 | Hallmark Cards, Inc. | Replication of information carriers |
JPS6176328A (ja) * | 1984-09-22 | 1986-04-18 | Mitsubishi Rayon Co Ltd | 表面特性に優れた合成樹脂成形品の製造方法 |
JPS6314340A (ja) * | 1986-07-07 | 1988-01-21 | Dainippon Printing Co Ltd | 可撓性レ−ザ−デイスク,その製造方法及び製造装置 |
US4836874A (en) * | 1987-01-30 | 1989-06-06 | Foster Michael S | Method of mass producing damage-resistant compact discs |
DE3719242A1 (de) * | 1987-06-06 | 1988-12-15 | Roehm Gmbh | Verfahren und vorrichtung zur herstellung von kunststoffolien |
JP2578459B2 (ja) * | 1988-01-25 | 1997-02-05 | キヤノン株式会社 | 情報記録媒体、情報記録媒体用基板の製造方法及び情報記録媒体用基板の成形用型 |
US5026510A (en) * | 1988-03-17 | 1991-06-25 | Canon Kabushiki Kaisha | Mold for cast molding substrate having preformat with information pits and method of using same |
EP0369780B1 (en) * | 1988-11-16 | 1996-01-24 | Canon Kabushiki Kaisha | Process for producing optical recording medium |
US5075060A (en) * | 1988-11-16 | 1991-12-24 | Canon Kabushiki Kaisha | Process for producing a substrate sheet for an optical recording medium |
EP0395395B1 (en) * | 1989-04-26 | 1993-07-28 | Canon Kabushiki Kaisha | Roll stamper for molding substrate used for optical recording medium, process for preparing same, and process for preparing optical recording medium making use of it |
JPH0326532A (ja) * | 1989-06-26 | 1991-02-05 | Canon Inc | 光記録媒体用基板の製造方法 |
-
1991
- 1991-11-14 US US07/791,308 patent/US5281371A/en not_active Expired - Fee Related
- 1991-11-15 IT ITRM910866A patent/IT1249470B/it active IP Right Grant
- 1991-11-15 JP JP03300385A patent/JP3072797B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3072797B2 (ja) | 2000-08-07 |
JPH04364243A (ja) | 1992-12-16 |
ITRM910866A0 (it) | 1991-11-15 |
US5281371A (en) | 1994-01-25 |
ITRM910866A1 (it) | 1993-05-15 |
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JPH08147774A (ja) | 光記録媒体用基板の製造方法 |
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