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1. 发明专利

JPH07307042A RESIN COMPOSITION FOR PROTECTIVE COAT OF MAGNETO-OPTICAL RECORDING MEDIUM, MAGNETO-OPTICAL RECORDING MEDIUM WITH PROTECTIVE COATING LAYER MADE OF SAME AND COATING ITS METHOD 失效
公开(公告)号：JPH07307042A
公开(公告)日：1995-11-21
申请号：JP9850594
申请日：1994-05-12
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： HARA TOMOAKI , MIYATA SHIRO
IPC分类号： C09D5/00 , G11B11/10 , G11B11/105
摘要： PURPOSE:To roughen the surface of a protective film so that the attraction of a levitating magnetic head is prevented by incorporating a compd. which generates bubbles under irradiation into a raditioncuring org. resin compsn. for forming a protective coat. CONSTITUTION:When a magneto-optical recording medium is coated with a protective coating agent and irradiated so as to cure the coating agent, a compd. which discharges gaseous nitrogen, etc., under irradiation in the coating agent as a resin compsn. for a protective coat absorbs radiation and causes a chemical reaction. By this reaction, nitrogen molecules, etc., are released from the compd. and remain as fine bubbles in an uncured protective coat. The bubbles rise by buoyancy until the resin cures well and the viscosity increases. The bubbles gather in the surface of the protective coat and the surface of the protective coat is made finely rugged by continuing irradiation until curing is completed.

2. 发明专利

JPH06180875A PRODUCTION OF MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH06180875A
公开(公告)日：1994-06-28
申请号：JP33164992
申请日：1992-12-11
申请人： NIPPON KOKAN KK , PURODEISUKU KK , DAINIPPON INK & CHEMICALS
发明人： YAMATO MASAYUKI , ISHIZUKA HITOSHI , KARIBAYASHI HIDEKI , HARA TOMOAKI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To suppress initial oxidation during sputtering and to increase weather resistance by forming a magneto-optical recording layer in an atmosphere of mixture of inert gas and gaseous hydrogen. CONSTITUTION:After disposing a polycarbonate resin substrate in a sputtering device, reactive sputtering is performed with using a Si target in a gaseous mixture atmosphere composed of gaseous nitrogen, gaseous Ar and gaseous hydrogen to form a SiN layer. A water content is heated and vaporized with an IR heater and carried out with a gas flow. Then a magneto-optical recording layer is formed on the SiN layer by sputtering with using an alloy target in a gaseous mixture atmosphere of gaseous Ar and gaseous hydrogen while removing a water content.

3. 发明专利

JPH09115185A OPTICAL RECORDING MEDIUM AND OPTICAL INFORMATION DETECTOR 失效
公开(公告)号：JPH09115185A
公开(公告)日：1997-05-02
申请号：JP27011395
申请日：1995-10-18
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： AOYAMA NOBUHIDE , MORIMOTO YASUAKI , HARA TOMOAKI , MORITA KENJI
IPC分类号： G11B7/24 , G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To make a high-density recording possible by decreasing crosstalks and cross erasures by a land and groove recording. SOLUTION: The groove depth 3 of this optical recording medium with which a land and groove recording is possible is set larger than the land width 4 and groove width 5 thereof. The optical recording medium and the optical information detector are preferably composed of a magneto-optical recording medium which has such a groove depth 3 larger than the focal length determined from an object lens and to be within the range of the pull-in signals for focusing and has a land width 4 larger than the groove width 3 and an optical recording and reproducing device arranging a space frequency filter consisting of a convergent lens and a pinhole or slit in it.

4. 发明专利

JPH0887779A COATING METHOD AND COATING DEVICE FOR OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0887779A
公开(公告)日：1996-04-02
申请号：JP22143194
申请日：1994-09-16
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： MIYATA SHIRO , HARA TOMOAKI
IPC分类号： G11B7/26 , B29C37/00
摘要： PURPOSE: To make it possible to easily decrease the magnitude of the curling of a recording medium while maintaining the surface appearance of a resin by heating a substrate prior to application of an active ray curing resin on this substrate. CONSTITUTION: The optical recording mediums placed on a turn table 8 are coated with the resins to a circular shape on their inner peripheral parts by a dispenser 9 while the media are kept rotated at a low speed of about 60rpm. The recording media are thereafter rotated at a high speed of about 1000 to 6000rpm, by which the resins are applied uniformly to the entire surface of the substrates. The optical recording media placed on a transporting tray pass together with the tray under a UV irradiation device 11 and the active ray curing resins on the media cure. The temp. of the optical recording media is kept by the heat of the transporting tray during this time. The optical recording media are thereafter discharged via another arms, etc., by which the optical recording media are cooled.

5. 发明专利

JPH0863797A OPTICAL DISK TEST DEVICE 失效
公开(公告)号：JPH0863797A
公开(公告)日：1996-03-08
申请号：JP20203894
申请日：1994-08-26
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK , PRODISC KK
发明人： HARA TOMOAKI , MIYATA SHIRO , ITO HIRONOBU
IPC分类号： G01N3/56 , G01M11/00 , G11B7/26 , G11B11/10 , G11B11/105
摘要： PURPOSE: To perform measurement conformable to use environment by actually setting a driving device in a high dust density atmosphere and evaluating the rate of occurrence of a read error and the change in a reflectance of an optical disk with a direct method of measuring them by the driving device. CONSTITUTION: A loudspeaker frequency as a dust generation device is adjusted by a knob 5 for speaker frequency, and is monitored by a meter 6 for loudspeaker frequency. An amplitude of a loudspeaker is adjusted by the knob 16 for loudspeaker amplitude, and is monitored by a digital amplitude meter 17. The number of revolutions of a spindle and revolution acceleration/ deceleration at the time of intermittent revolution are adjusted by the knob 3 for spindle revolution with a double structure, and is monitored by the meter 4 for spindle revolution. Whether the spindle is rotated in continuous revolution or intermittent revolution is selected by a continuous/intermittent changeover switch 18. Then, the summed-up number of cycles at the time of intermittent revolution is counted by a digital counter 2, and is controlled by an on/off switch linked with the counter 2.

6. 发明专利

JPH0991784A MAGNETO-OPTICAL RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH0991784A
公开(公告)日：1997-04-04
申请号：JP24937395
申请日：1995-09-27
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： HARA TOMOAKI , MIYATA SHIRO
IPC分类号： G11B11/10 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To obtain a medium having a protective film which is excellent in an adhesion property while maintaining sliding resistance and flawing resistance by setting the critical surface tension atop at least >=1 layer of the intermediate layers existing between the upper and lower two layers of the protective film higher than the front surface of the lower layer. SOLUTION: Recording layers of a four-layered structure are formed by forming the first layer of a dielectric film 2, a recording film 3, a second layer of the dielectric film 4 and a reflection film 5 in this order on a substrate 1. A hard coating layer 6 is formed on the surface on the side opposite to the recording layers of the substrate 1. A first protective coating layer 7, a second protective coating layer 8 and a third protective coating layer 9 are applied on the recording layers formed in such a manner and are cured by UV rays, by which the magneto-optical recording medium is completed. As a result, the medium is given the extremely high durability to a head crash and the adhesion property of the protective coating layers is extremely enhanced. Since wrinkles, etc., are not developed between the protective coating layers, the production yield of the medium is increased at the time of production.

7. 发明专利

JPH07182692A RESIN COMPOSITION FOR OPTICAL DISK HARDCOAT AND OPTICAL DISK WITH ITS CURED FILM 失效
公开(公告)号：JPH07182692A
公开(公告)日：1995-07-21
申请号：JP32204693
申请日：1993-12-21
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： MIYATA SHIRO , HARA TOMOAKI
IPC分类号： G11B7/254 , G11B7/24 , G11B7/257 , G11B11/10 , G11B11/105
摘要： PURPOSE:To enhance the preservation stability of composition while holding excellent antistatic effect, scuff resistance and emulsification preventing effect by incorporating a predetermined wt.% of alkanediol di(meth)acrylate in the composition. CONSTITUTION:The resin composition for an optical disk hardcoat comprises (meth)acrylic ester having a phosphate group, amine having (meth)acryloyl group and alkanediol di(meth)acrylate, wherein a content of the alkanediol di(meth)acrylate is set to a range of 20-60wt.%. A surface of an optical disk to receive a laser light is coated with the composition by coating means of a spin coating method, and then cured by irradiating/heating the composition with an active light beam such as an ultraviolet ray, an electron beam, etc., thereby forming a hard film as a hardcoat.

8. 发明专利

JPH07121904A OPTICAL DISK 失效
公开(公告)号：JPH07121904A
公开(公告)日：1995-05-12
申请号：JP26478093
申请日：1993-10-22
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： MIYATA SHIRO , MATSUOKA HIDEKI , HARA TOMOAKI
IPC分类号： G11B11/105 , G11B7/24 , G11B11/10
摘要： PURPOSE:To obtain a very excellent antistatic effect keeping sufficient resistance to scratching in a laser light incident surface. CONSTITUTION:In an optical disk having a recording layer 4 on a resin transparent substrate 2, a ground layer 8 with a surface resistance below 1X10 OMEGA/squ. in the environment of 25 deg.C and RH of 50% is provided on the surface of a substrate on the incoming side of a laser light of the optical disk. Moreover, at least an area 7 into which a laser light is incident of the ground layer 8 is covered with a hard coated layer 6 comprising a hardened film of an active light beam hardening type resin while the whole or a part of the area into which no laser light is incident of the ground layer 8 is exposed to a hard coat layer 6 not being covered.

9. 发明专利

JPH09128825A MAGNETO-OPTICAL RECORDING MEDIUM AND OPTICAL INFORMATION DETECTOR 失效
公开(公告)号：JPH09128825A
公开(公告)日：1997-05-16
申请号：JP28043695
申请日：1995-10-27
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： MORIMOTO YASUAKI , AOYAMA NOBUHIDE , HARA TOMOAKI , MORITA KENJI
IPC分类号： G11B11/10 , G11B7/135 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To provide a land and groove recording type magneto-optical information recording medium with which the high-density recording with the decreased crosstalks between adjacent lands and grooves is possible and an optical information detector. SOLUTION: This device consists of the constitution in which the phase differences of polarization components vary with the land parts and groove parts of the optical recording medium with which the land and groove recording is possible. The means thereof consists of the constitution to form the land parts or the land parts and the groove parts of a material having the refractive index different from the refractive index of a transparent substrate on this substrate, the constitution to use the material particularly having double refraction as the material described above and the constitution varying in the thickness or refractive index of the dielectric substance in the land parts and the groove parts. This optical information detector is constituted to have one or two of such magnetic Kerr effect detecting systems which are arranged with electro-optical elements, wavelength plates and particularly half-wave plates as the phase compensation elements of the polarization components.

10. 发明专利

JPH0935348A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0935348A
公开(公告)日：1997-02-07
申请号：JP18152195
申请日：1995-07-18
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： HARA TOMOAKI , MIYATA SHIRO
IPC分类号： G11B11/10 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To prevent the increase of medium error rate and to ensure high resistance to head crash by forming a low hardness layer as the lowest layer of a protective coat kept in contact with a magnetooptical recording layer and a high hardness layer as the top layer. SOLUTION: A plastic substrate 1 with a pattern on one face is made of polycarbonate and dielectric films 2, 4, a recording film 3 and a reflecting film 5 are formed on the pattern forming face of the substrate 1. The top of the reflecting film 5 is coated with a 1st protective coating layer 7 of a radiation-curable resin compsn. and the top of the layer 7 is further coated with a 2nd protective coating layer 8. High resistance to pressure and shock in a head crash is ensured by preferably making the hardness of the 1st protective layer 7 as low as B or below in a pencil hardness test stipulated by JIS K5400. A protective surface excellent in scuffing and wear resistances can be obtd. by preferably making the hardness of the 2nd protective layer 8 as high as 4H or above in the pencil hardness test.

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