WO2003021591A1 - Procede permettant de mesurer la caracteristique de frottement de la surface d'un support d'enregistrement optique - Google Patents

Procede permettant de mesurer la caracteristique de frottement de la surface d'un support d'enregistrement optique Download PDF

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Publication number
WO2003021591A1
WO2003021591A1 PCT/JP2002/008602 JP0208602W WO03021591A1 WO 2003021591 A1 WO2003021591 A1 WO 2003021591A1 JP 0208602 W JP0208602 W JP 0208602W WO 03021591 A1 WO03021591 A1 WO 03021591A1
Authority
WO
WIPO (PCT)
Prior art keywords
recording medium
optical recording
friction
measuring
measurement
Prior art date
Application number
PCT/JP2002/008602
Other languages
English (en)
Japanese (ja)
Inventor
Naoki Hayashida
Hideki Hirata
Original Assignee
Tdk Corporation
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 Tdk Corporation filed Critical Tdk Corporation
Publication of WO2003021591A1 publication Critical patent/WO2003021591A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/02—Measuring coefficient of friction between materials
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
    • 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
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers

Definitions

  • the present invention relates to a method for measuring friction characteristics of an optical recording medium surface, and more particularly, to a method for measuring a friction force and / or a coefficient of friction on an optical recording medium surface.
  • a read-only optical recording medium has a light-transmitting layer (light-transmitting substrate), a reflective layer, and a protective layer laminated in this order from the light incident surface side, and a writable optical recording medium has a light incident surface side.
  • Each layer is laminated in the order of a light-transmitting layer (light-transmitting substrate), a recording layer, a reflective layer, and a protective layer.
  • the reproducing power is applied from the light-transmitting layer side.
  • the reflected laser beam is detected by irradiating the laser beam set in the above.
  • a laser beam set to a recording power is irradiated from the light transmitting layer side, and the thermal state and the optical energy of the laser beam cause the chemical state of the recording layer to change. Or the physical state is changed based on the data to be recorded.
  • the laser beam applied to the optical recording medium is focused by an optical system such that a beam spot having a predetermined diameter is formed in the reflection layer or the recording layer. For this reason, if there is a scratch on the surface of the light transmitting layer, the beam spot is not formed correctly, and a reading error or a writing error may occur.
  • a method for preventing the occurrence of such scratches a method of providing a hard coat layer having high hardness on the surface of the light transmitting layer has been conventionally known.
  • NA numerical aperture
  • the working distance (working distance) between the objective lens and the surface of the optical recording medium is reduced.
  • the working distance is 10 mm. It is about 0 m, which is significantly narrower than before.
  • the possibility of contact between the surface of the optical recording medium and the objective lens and the support that supports it during rotation of the optical recording medium becomes extremely high. If such contact occurs during rotation, there is a possibility that a fatal scratch may occur on the surface of the light transmitting layer of the optical recording medium.
  • the occurrence of scratches due to such contact can be suppressed to some extent by providing the above-described hard coat layer.
  • the light transmitting layer is thinned to about 100 im, the surface of the light transmitting layer may be damaged.
  • the focusing diameter of the laser beam used for recording, Z or reproduction is also extremely small, so even if the size of the scratches or dirt does not cause a reading error or writing error with conventional optical recording media, it is easy to read or write. You will get an error. For this reason, simply increasing the hardness of the hard coat layer is not enough to reduce scratches caused by contact during rotation.
  • the present inventors In order to effectively reduce scratches on the surface of the optical recording medium caused by contact during rotation, the present inventors not only increase the hardness of the hard coat layer but also reduce the friction coefficient of the hard coat layer surface. Is valid Reached the conclusion.
  • the optical characteristics can be measured by accurately measuring the friction characteristics (frictional force and / or coefficient of friction) on the surface of the hard coat layer. It is necessary to evaluate the recording medium. Disclosure of the invention
  • an object of the present invention is to provide a method for accurately measuring the friction characteristics (frictional force and / or coefficient of friction) of the surface of an optical recording medium, particularly the surface of a light transmitting layer or a hard coat layer.
  • Another object of the present invention is to provide a method for accurately measuring the frictional characteristics of the surface of an optical recording medium of the type that records and reproduces data without physical contact.
  • An object of the present invention is to provide a method capable of accurately measuring such a coefficient of friction based on the idea that it is effective to reduce the coefficient of friction and mitigate damage at the time of contact.
  • An object of the present invention is to provide a method for measuring frictional characteristics of an optical recording medium surface, which comprises contacting a measuring member in a plane with the surface of an optical recording medium and detecting a tensile force generated on the measuring member. Achieved by According to the present invention, it is possible to very accurately measure the friction characteristics of the optical recording medium surface. Accordingly, the objective lens during rotation of the optical recording medium, or the friction coefficient of the optical recording medium surface that is reduced to a predetermined value or less in order to reduce scratches on the optical recording medium surface caused by contact with the support that supports the objective lens. In this case, it is possible to accurately and easily evaluate the optical recording medium at the time of manufacturing.
  • the method for measuring frictional characteristics provides a method for measuring the frictional characteristics of the surface of an optical recording medium in which the light transmitting layer is thinned to about 5 to 300 m, and particularly to about 50 to about 50 ⁇ m. Suitable for measurement.
  • the surface of the optical recording medium Is a light incident surface.
  • the tensile force is detected while applying a load to the measuring member by surface contact.
  • surface contact can be replaced by a number of point contacts in addition to the contact in a plane.
  • the measuring member is in a thin film shape.
  • the measuring member is a non-woven cloth.
  • the friction characteristics are a friction force and Z or a coefficient of friction.
  • the optical recording medium is a type of an optical recording medium that performs data recording and Z reproduction without physical contact.
  • FIG. 1 is a diagram for explaining a friction characteristic measuring method according to a preferred embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing an example of the optical recording medium 10 to be measured by the friction characteristic measuring method according to a preferred embodiment of the present invention.
  • FIG. 3 is a graph showing the measurement results of the friction coefficients of Sample # 1 to Sample # 6.
  • FIG. 4 is a graph showing the measurement results of the coefficient of friction of Sample # 2 and Sample # 2 '.
  • FIG. 1 is a diagram for explaining a friction characteristic measuring method according to a preferred embodiment of the present invention.
  • a rotation mechanism 1 for rotating an optical recording medium to be measured a thin film piece for measurement 2 as a measuring member, A weight 3 for pressing the thin film piece 2 for measurement against the surface of the optical recording medium to be measured, and a transducer 4 for detecting a tensile force generated on the thin film piece 2 for measurement are used.
  • the thin film piece for measurement 2 is used to convert a frictional force generated between the rotating optical recording medium and the surface thereof into a tensile force, and is not particularly limited, but a nonwoven fabric is used as the material. Is preferred.
  • the weight 3 has a columnar shape with a flat bottom surface, and a cushioning material 5 is provided on the bottom surface portion so that the load on the thin film piece 2 for measurement is evenly distributed in a plane.
  • a cushioning material 5 is provided on the bottom surface portion so that the load on the thin film piece 2 for measurement is evenly distributed in a plane.
  • FIG. 2 is a cross-sectional view schematically showing an example of the optical recording medium 10 to be measured by the friction characteristic measuring method according to the present embodiment.
  • an optical recording medium 10 which is an example of an object to be measured has a substrate 11 having a thickness of about 1.1 mm and a reflective layer 1 having a thickness of 70 to: L30 nm. 2, a recording layer 13 having a thickness of S 100 to 250 nm, a light transmitting layer 14 having a thickness of 5 to 300 ⁇ m, and a thickness of 0.5 to: ⁇ . It is composed of a hard coat layer 15 of ⁇ . A hole 16 is provided in the center of the optical recording medium 10.
  • the substrate 11 is made of polycarbonate, and the reflection layer 12 is made of an alloy mainly containing silver.
  • the recording layer 13 has a multilayer structure in which a dielectric film is interposed between the top and bottom of a phase change film in which data is actually recorded.
  • the light transmitting layer 14 and the hard coat layer 15 are made of an ultraviolet curable resin.
  • the measurement target of the friction characteristic measurement method according to the present embodiment is
  • the optical recording medium 10 is a type of optical recording medium in which data is recorded and Z-reproduced by irradiation with a laser beam.
  • the measurement object of the friction characteristic measuring method according to the present embodiment may be a magnetic field modulation type optical recording medium such as a magneto-optical recording medium.
  • the magnetic head is in contact with the magnetic head.
  • the recording / reproducing light incident surface is the object to be measured.
  • the optical recording medium 10 to be measured is placed on a rotating table (not shown) of the measuring apparatus with the hard coat layer 15 facing upward, and then the hard coat The thin film piece for measurement 2 and the weight 3 are placed on the surface of the layer 15.
  • the rotation mechanism 1 is operated to rotate the optical recording medium 10.
  • FIG. 1 shows such a state.
  • the tensile force is converted into an electric signal by the transducer 4, whereby it is possible to specify the friction characteristics of the surface of the optical recording medium 10, that is, the friction force and / or the coefficient of friction.
  • the weight 3 having a flat bottom is used to apply a uniform load on the surface of the optical recording medium and the thin film piece 2 for measurement.
  • the frictional characteristics are measured while making contact, so that the frictional characteristics of the light incident surface of the type of optical recording medium that performs data recording / reproduction without physical contact can be measured accurately and with good reproducibility. Can be set. For this reason, especially in an optical recording medium in which the light transmitting layer is thinned, it is necessary to reduce scratches on the surface of the optical recording medium caused by contact with the objective lens and the support supporting the objective lens during rotation.
  • the friction coefficient of the recording medium surface is suppressed to a predetermined value or less, it is possible to accurately evaluate the optical recording medium at the time of manufacturing.
  • the friction characteristics of the light incident surface of the optical recording medium in which the light transmitting layer is thinned are measured, but the optical recording medium that can be measured by the method according to the present invention is not limited to this. As long as it is an optical recording medium of the type that records and reproduces data without physical contact, measurement can be performed on the light incident surface of another type of optical recording medium.
  • the weight 3 having a flat bottom is used so that the surface of the optical recording medium and the thin film piece 2 for measurement are brought into contact with each other by applying a uniform load in a plane.
  • the load may be applied to the thin film piece for measurement 2 by any method as long as it can be brought into contact with a uniform load in a plane.
  • a measuring member having a sufficient weight to perform effective measurement is used instead of using the measuring thin film piece. You can get friction.
  • the friction coefficients of the surfaces of the six optical recording media (Sample # 1 to Sample # 6) on which different hard coat layers were formed were measured using the friction characteristic measuring method according to the present embodiment.
  • a nonwoven fabric 100 mm in length and 25 mm in width, made by Asahi Kasei Corporation, Bencott Lint Free CT-18
  • the length of the thin film piece for measurement 2 is a direction in which a tensile force acts, and in FIG.
  • the weight 3 was 2 Omm in diameter and weighed 31 g.
  • the center of the weight 3 is 40 mm from the center of the optical recording medium.
  • the rotational speed of the optical recording medium by the rotation mechanism 1 was set to 670 rpm, and the friction coefficient of each optical recording medium was measured.
  • the hard coat layer 15 was a UV curable resin (Nippon Kayaku Co., Ltd.).
  • Optical recording media composed of HOD-3200) and having different types and amounts of lubricant added to the ultraviolet-curable resin were prepared.
  • Table 1 shows the type and amount of lubricant contained in the hard coat layer 15 of each sample. In each of the samples, the thickness of the hard coat layer was set to 3.
  • FIG. 3 is a graph showing the measurement results of the friction coefficient of Sample # 1 to Sample # 6.
  • the vertical axis represents the friction coefficient
  • the horizontal axis represents the cumulative number of rotations of the optical recording medium.
  • the difference in friction coefficient between Sample # 1 to Sample # 6 clearly appears.
  • the amount of change in the friction coefficient based on the cumulative number of rotations of the optical recording medium that is, the number of times the thin film piece 2 for measurement slides clearly appears.
  • the increase in the coefficient of friction based on the cumulative number of rotations of the optical recording medium is due to the fact that the lubricant contained in the hard coat layer 15 was wiped off by the thin film piece 2 for measurement. Therefore, the change in the coefficient of friction in FIG. 3 is due to the fact that the user frequently wipes off dust and dirt adhering to the surface of the optical recording medium with a nonwoven fabric or tissue paper. It can be used as important data to know how it affects the friction coefficient of the recording medium, that is, its durability.
  • the above-described sample was measured using an apparatus for measuring the frictional characteristics of the surface of the magnetic field modulation head, which is not the optical pickup side, of a magnetic field modulation type optical recording medium, MD (mini disc).
  • MD magnetic field modulation type optical recording medium
  • the device for measuring the friction characteristics of the surface of the MD is a device used for measuring the friction force and / or friction coefficient of the surface on the side where the magnetic field modulation head contacts.
  • the measurement using such an apparatus is described on page 20 of the Annex of the Mini Disc System Standard (Rainbow Book).
  • a measuring device for an optical recording medium of a type in which data is recorded and reproduced while making physical contact with a magnetic field modulation head or the like is used to record data without making physical contact. It can be seen that it is not suitable for measuring the frictional force and / or coefficient of friction of the light incident surface of the type of optical recording medium on which reproduction is performed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention concerne un procédé permettant de mesurer, de façon précise, la caractéristique de frottement de la surface d'un support d'enregistrement optique, en particulier, la surface d'une couche de transmission de la lumière ou d'une couche dure. Une pièce de mesure à film mince (2) et un poids (3) sont placés sur la surface d'un support d'enregistrement optique puis ce support d'enregistrement optique est ainsi entraîné en rotation. La force de traction produite dans la pièce à film mince (2) est mesurée par un transducteur (4). On peut donc évaluer un support d'enregistrement optique, de façon simple et précise, pendant son processus de fabrication, en réduisant le coefficient de frottement de la surface du support d'enregistrement optique à une valeur prédéterminée ou inférieure, de manière à réduire les rayures sur le support d'enregistrement optique en rotation, provoquées par le contact du support d'enregistrement optique avec l'objectif ou le support de l'objectif.
PCT/JP2002/008602 2001-08-29 2002-08-27 Procede permettant de mesurer la caracteristique de frottement de la surface d'un support d'enregistrement optique WO2003021591A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-259547 2001-08-29
JP2001259547A JP2003067980A (ja) 2001-08-29 2001-08-29 光記録媒体表面の摩擦特性測定方法

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Publication Number Publication Date
WO2003021591A1 true WO2003021591A1 (fr) 2003-03-13

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WO (1) WO2003021591A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4213913B2 (ja) * 2002-07-01 2009-01-28 Ｔｄｋ株式会社 光記録媒体についての摩擦特性測定方法、および光記録媒体用の摩擦特性測定装置
JP5574414B2 (ja) * 2010-03-29 2014-08-20 ダブリュディ・メディア・シンガポール・プライベートリミテッド 磁気ディスクの評価方法及び磁気ディスクの製造方法
CN109557024A (zh) * 2018-12-04 2019-04-02 河南工业大学 一种检测谷物颗粒间摩擦力的检测装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5118591A (ja) * 1974-08-07 1976-02-14 Sumitomo Metal Ind Yoshayoshitajimennotekihio teiryotekinisokuteisuruhoho
JPS59135461U (ja) * 1983-02-28 1984-09-10 富士通株式会社 摩擦測定器
JPS6352037A (ja) * 1986-08-22 1988-03-05 Sony Corp 磁気デイスクの摩擦測定方法
JPH04269642A (ja) * 1991-02-25 1992-09-25 Dainippon Printing Co Ltd 摩擦係数測定装置
JPH06201572A (ja) * 1992-12-28 1994-07-19 Victor Co Of Japan Ltd 摩擦評価装置
JPH07113635A (ja) * 1993-10-18 1995-05-02 Kuraray Co Ltd 光ディスク検査装置
JPH10302309A (ja) * 1997-04-25 1998-11-13 Sony Corp 光学記録媒体
JP2001155334A (ja) * 1999-11-26 2001-06-08 Sony Corp 表面分析装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5118591A (ja) * 1974-08-07 1976-02-14 Sumitomo Metal Ind Yoshayoshitajimennotekihio teiryotekinisokuteisuruhoho
JPS59135461U (ja) * 1983-02-28 1984-09-10 富士通株式会社 摩擦測定器
JPS6352037A (ja) * 1986-08-22 1988-03-05 Sony Corp 磁気デイスクの摩擦測定方法
JPH04269642A (ja) * 1991-02-25 1992-09-25 Dainippon Printing Co Ltd 摩擦係数測定装置
JPH06201572A (ja) * 1992-12-28 1994-07-19 Victor Co Of Japan Ltd 摩擦評価装置
JPH07113635A (ja) * 1993-10-18 1995-05-02 Kuraray Co Ltd 光ディスク検査装置
JPH10302309A (ja) * 1997-04-25 1998-11-13 Sony Corp 光学記録媒体
JP2001155334A (ja) * 1999-11-26 2001-06-08 Sony Corp 表面分析装置

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