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1. 发明专利

JPH11114826A POLISHING DEVICE FOR GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH11114826A
公开(公告)日：1999-04-27
申请号：JP27855297
申请日：1997-10-13
申请人： SAGAMI OPT KK , NIKON GIJUTSU KOBO KK , NIKON CORP
发明人： YOSHINO KUNIHIKO , KAMEYAMA SATORU , KUSANO TATSUICHI , OZAWA MASAHARU
IPC分类号： B24B57/02
摘要： PROBLEM TO BE SOLVED: To reduce flaws on a surface in abrasive machining for a glass substrate for a magnetic recording medium. SOLUTION: This abrasive device consists of a double-face sander 1 for carrying out abrasive machining for a glass substrate for a magnetic recording medium by using an abrasive lubricant mixed with abrasive, and an abrasive lubricant circulating device 2 for re-supplying the abrasive lubricant used for the abrasive machining to the double-face sander 1. In this case, the abrasive lubricant circulating device 2 consists of a first tank 21 for inflowing the abrasive lubricant used for the abrasive machining, and a second tank 22 interposed between the first tank 21 and the double-face sander 1. In the first tank 21, sedimentation separation of a glass substance from an abrasive is carried out and the sedimeted abrasive mixed abrasive lubricant is discharged to the second tank 22. The abrasive lubricant mixed only abrasive is supplied from second tank 22 to the double-face sander 1.

2. 发明专利

JPH11349354A SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH11349354A
公开(公告)日：1999-12-21
申请号：JP15916298
申请日：1998-06-08
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , FUTAMI TOSHIHIKO , KAMEYAMA SATORU , NAGASHIMA TOSHIO
IPC分类号： C03C19/00
摘要： PROBLEM TO BE SOLVED: To obtain a substrate for information recording media capable of remarkably improving yield in production of the substrate for information recording media and production of information recording media, compared with that of a conventional producing method and provide a method for producing the substrate. SOLUTION: This method for producing a substrate for information recording media comprises a step for preparing a disk-like (or nearly cylindrical) substrate having a cylindrical (or nearly cylindrical) through hole in the center part, a step for simultaneously carrying out sizing and shaping grinding processing of inner and outer circumferential end faces of the substrate and beveling grinding processing of inner and outer circumferential parts in inner and outer circumferences and a step for simultaneously carrying out grinding processing of inner and outer circumferential end faces and beveling part of the substrate subjected to grinding processing in inner and outer circumferences.

3. 发明专利

JPH1160282A POLISHING OF GLASS SUBSTRATE FOR MAGNETIC DISK 失效
公开(公告)号：JPH1160282A
公开(公告)日：1999-03-02
申请号：JP21105597
申请日：1997-08-05
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , KONDO MASAO
IPC分类号： C03C19/00 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a method for polishing and finishing a glass substrate to obtain the glass substrate small in surface roughness and used for a magnetic disk. SOLUTION: The method for polishing a glass substrate 1 comprises using a polishing liquid containing cerium oxide as a polishing agent. Therein, a low concentration polishing liquid having a cerium oxide content of 0.5-8 wt.% is used as the polishing liquid. Or, a polishing liquid having a cerium oxide content of 15-25 wt.% is used in the first process, and a polishing liquid having a cerium oxide content of 0. 5-8 wt.% is subsequently used in the second process.

4. 发明专利

JPH1133918A GRINDING WHEEL FOR WORKING INSIDE AND OUTSIDE DIAMETER OF SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, AND METHOD FOR WORKING INSIDE AND OUTSIDE DIAMETER 失效
公开(公告)号：JPH1133918A
公开(公告)日：1999-02-09
申请号：JP19124597
申请日：1997-07-16
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , KUSANO TATSUICHI
IPC分类号： B24B9/00 , B24D5/02 , B24D5/14 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a grinding wheel for working inside and outside diameters, which satisfies both reduction in working hours and prevention of generation of breakage and chips when the inside and outside diameters of a substrate for a magnetic recording medium are worked, also to provide a working method using this grinding wheel. SOLUTION: A grinding wheel 1 for working an inside diameter and a grinding wheel 6 for working an outside diameter that are bodies of revolution of a spool-shape are respectively composed of the first member having coarse grinding wheel grains and the second member having fine grinding wheel grains. The grinding wheel 1 for working an inside diameter and the grinding wheel 6 for working an outside diameter have grooves of a trapezoidal cross section. The grooves have preferably slopes with an inclination of 41 deg. or above and 47 or below against a perpendicular line to an axis of the body of revolution, and the first member preferably has grinding wheel grain of #50-#350, the second member preferably has grinding wheel grain of #380-#1000. First, the working of inside and outside diameters of the substrate is performed by the first member, then the working of inside and outside diameters is performed by the second member.

5. 发明专利

JPH10249737A POLISHING PAD OF SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND POLISHING METHOD 失效
公开(公告)号：JPH10249737A
公开(公告)日：1998-09-22
申请号：JP6129497
申请日：1997-03-14
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , KONDO MASAO , KUSANO TATSUICHI
IPC分类号： B24B1/00 , B24B37/20 , B24B37/24 , B24B37/26 , B24D11/00 , G11B5/84 , B24B37/00
摘要： PROBLEM TO BE SOLVED: To provide the surface roughness of a specific range, by impregnating a fiber base material of nonwoven fabric with a polyurethane resin, and solidifying the same in wet to obtain the hardness of a specific range. SOLUTION: A substrate 1 is placed between a polishing pad 3 fixed to an upper surface plate made of cast iron, and a polishing pad 4 fixed to a lower surface plate with the proper pressure in a double face polishing machine, and the polishing fluid containing a polishing agent 5 is supplied between the polishing pads 3, 4 and the substrate 1, to perform the polishing by rotating and sliding the polishing pads 3, 4. On this occasion, the polishing pads 3, 4 which are prepared by impregnating the fiber base material of nonwoven fabric with a polyurethane resin, and solidifying the same in wet, and has 75-85 of hardness by a hardness test (A-type) stipulated by JIS K6301, are pasted to the upper and lower surface plates. Whereby the surface roughness of the substrate for a magnetic recording medium can be finished within a specific range constantly.

6. 发明专利

JP2002025045A METHOD FOR MANUFACTURING SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND SUBSTRATE FOR INFORMATION RECORDING MEDIUM MANUFACTURED BY THAT MANUFACTURE METHOD 失效
公开(公告)号：JP2002025045A
公开(公告)日：2002-01-25
申请号：JP2000209722
申请日：2000-07-11
申请人： SAGAMI OPT KK , NIKON CORP
发明人： FUJIMOTO MASARU , YOSHINO KUNIHIKO
IPC分类号： B24B1/00 , C03C19/00 , G11B5/73 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a substrate for an information recording medium by which deposition of dirt remaining on the surface of the substrate for an information recording medium is prevented and a high- quality recording film can be formed. SOLUTION: In the method for manufacturing the substrate for an information recording medium including a process of polishing the surface of the substrate for an information recording medium, the surface of a glass magnetic disk substrate 1 as the substrate for an information recording medium is polished in the environment prepared by controlling the humidity in the polishing room to >=65%.

7. 发明专利

JP2001026461A SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND THEIR PRODUCTION, INFORMATION RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM AND HARD DISK DRIVE DEVICE 失效
公开(公告)号：JP2001026461A
公开(公告)日：2001-01-30
申请号：JP19986199
申请日：1999-07-14
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , FUTAMI TOSHIHIKO , ISONO YUICHI
IPC分类号： G11B5/73 , C03C15/02 , G11B5/84 , G11B7/24
摘要： PROBLEM TO BE SOLVED: To provide a substrate for an information recording medium which is capable of preventing the attraction and contact of a recording head and a substrate and making the flying height of head lower, a substrate for a magnetic recording medium and a process for producing these substrates, the information recording medium, the magnetic recording medium and a hard disk drive having these. SOLUTION: The substrate for the information recording medium is a rigid substrate of a nonmagnetic material formed with a coating of the information recording medium on a surface facing the recording head and the surface roughness of the main surface measured in a measurement region of 10 μm (square) by an atomic force microscope is Rmax =70 angstrom, where Rmax: the maximum surface roughness, Rp: the height from a central line to the highest part, Rv: the depth from the central line to the deepest part, Rmax=Rb+Rv.

8. 发明专利

JPH1190813A PROCESSING DEVICE OF GLASS BOARD FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH1190813A
公开(公告)日：1999-04-06
申请号：JP25676897
申请日：1997-09-22
申请人： SAGAMI OPT KK , NIKON CORP
发明人： YOSHINO KUNIHIKO , NAGASHIMA TOSHIO , OSHIRO RIICHI
IPC分类号： B24B37/12 , B24B37/04
摘要： PROBLEM TO BE SOLVED: To provide a processing device of a glass board for magnetic recording medium which can finish the glass board in a lapping process in small thickness in a short time and which involves less loss of abrasive grains. SOLUTION: A plurality of diamond pellets 1 are attached to the grinding wheel holding surfaces 3a and 4a of an upper 3 and a lower surface plate 4 with a specified spacing reserved in between. The area of those lapping surfaces 1a of the upper and lower pellets 1 contacting with a glass board for magnetic recording medium is arranged below 50% approx. uniformly of the area of the grinding wheel holding surfaces 3a and 4a of the upper and lower surface plates 3 and 4. If the upper and lower pellets 1 are rubbed to the oversurface and undersurface of the glass board, simultaneous lapping can be applied to the oversurface and undersurface of the board.

9. 发明专利

JPH1110529A SIMULTANEOUSLY BOTH-SIDED WORKING METHOD 失效
公开(公告)号：JPH1110529A
公开(公告)日：1999-01-19
申请号：JP16134097
申请日：1997-06-18
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , KERA SHOJI
IPC分类号： B24B37/08 , G11B5/84 , B24B37/04
摘要： PROBLEM TO BE SOLVED: To keep and improve the flatness and smoothness of a substrate for a magnetic recording medium without breaking a process by reversing the rotating directions of an upper lapping machine and a lower lapping machine every time working a designated number of times is ended. SOLUTION: A simultaneously both-sided working machine is so constructed that an upper lapping machine and a lower lapping machine 5 are rotated in the opposite directions. For example, the upper lapping machine is rotated clockwise, the lower lapping machine 5 is rotated counterclockwise, and a carrier 2, a sun gear 3 and an internal gear 4 are also rotated counterclockwise. The fine grinding condition is that the working pressure, the working time and the rotating speeds of the upper lapping machine and the lower lapping machine 5 are all designated values. The rotating speeds of the upper and lower lapping machines are reversed every time working is performed five times. The polishing condition is that the working pressure, the working time and the rotating speeds of the upper lapping machine and the lower lapping machine 5 are all designated values. The rotating speeds of the upper and lower lapping machines are reversed every time working is performed five times. Thus, the flatness and surface roughness of a worked article can be kept and improved.

10. 发明专利

JPH1110528A SIMULTANEOUSLY BOTH-SIDED POLISHING METHOD 失效
公开(公告)号：JPH1110528A
公开(公告)日：1999-01-19
申请号：JP16133897
申请日：1997-06-18
申请人： NIKON CORP , SAGAMI OPT KK
发明人： YOSHINO KUNIHIKO , KONDO MASAO
IPC分类号： B24B37/08 , G11B5/84 , B24B37/04
摘要： PROBLEM TO BE SOLVED: To keep and improve the flatness, surface roughness, appearance and dimensional accuracy of polishing by reversing the rotating direction of a carrier after the end of polishing designated number of times. SOLUTION: In case of seeing a simultaneously both-sided polishing machine from above, a sun gear 3, an internal gear 4 and a lower lapping machine 5 are all rotated counterclockwise, an upper lapping machine is rotated clockwise, and a carrier 2 is revolved round the sun gear 3 counterclockwise. The rotating direction of the carrier 2 is reversed every time working is performed five times. Concerning the cycle of reversion in the rotating direction of the carrier, it is suitable that the number of times of conducting a polishing process is within 10 times, and preferably it is within 5 times. Thus, the rotating direction of the carrier 2 is reversed every time polishing is performed a designated number of times, whereby the flatness and surface roughness of a product can be kept and improved. Further a magnetic head can be decreased in floating amount, so that the magnetic disc can be densificated and especially the line recording density can be improved.

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