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公开(公告)号：JPH03178013A
公开(公告)日：1991-08-02
申请号：JP31702389
申请日：1989-12-06
Applicant: SONY CORP
Inventor： MORITA OSAMI , TAKINO HIROSHI
Abstract: PURPOSE:To optimize reproducing efficiency when a track is narrowed down by setting a ratio t/w to be 2-12 between thickness (t) and track width (w) in the track breadthwise direction of a magnetic core excepting for a magnetic gap forming part. CONSTITUTION:When the core thickness (t) is more than 12 times of the track width (w), the magnetic resistance of magnetic cores 2 and 3 is made small. However, a leaked magnetic flux is enlarged and the reproducing efficiency is lowered. When the core thickness (t) is less than double to the track width (w), the leaked magnetic flux is reduced. However, the magneto-resistance of the magnetic cores 2 and 3 is enlarged and the reproducing efficiency is lowered. Thus, for the thickness (t) and track width (w) in the track width (w) direction of the magnetic cores 2 and 3 excepting for a magnetic gap (g) forming part, since the ratio t/w is set to be 2-12, the reproducing efficiency can be made optimum for a narrow track magnetic head 1 which track width is less than 10mum, especially, less than 5mum.
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公开(公告)号：JPS63305206A
公开(公告)日：1988-12-13
申请号：JP14124187
申请日：1987-06-05
Applicant: SONY CORP
Inventor： MORITA OSAMI , KAWAZOE KAZUSHIGE , SAITO ICHIRO
Abstract: PURPOSE:To enhance measuring accuracy, by setting the face-to-face angle of a pair of oblique cut surfaces adjacent to the recording medium facing and contact surface of the dummy head faced to a recording medium and the angle of a pair of the oblique cut surfaces with respect to an optical axis to predetermined values. CONSTITUTION:A pair of oblique cut surfaces 3a, 3b are the surfaces respectively formed between a recording medium facing and contact surface 2 and leading end inclined surfaces 4a, 4b and the face-to-face angle (the total angle of an angle phi and an angle phi') of a pair of the oblique cut surfaces 3a, 3b is set to pi/2 and a pair of the above-mentioned oblique cut angle phi with respect to an optical axis set to thetaC
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公开(公告)号：JP2001043652A
公开(公告)日：2001-02-16
申请号：JP21751699
申请日：1999-07-30
Applicant: SONY CORP
Inventor： MORITA OSAMI
IPC: G11B23/03
Abstract: PROBLEM TO BE SOLVED: To protect a disk housed in a cartridge main body together with a shutter member. SOLUTION: In the lower shell 3 of a cartridge main body formed to be roughly rectangular, a front part being set as a bent surface with its center bulged, a driving opening part 24 is formed for the entry of a part of a rotary- driving mechanism for rotary-driving a disk, and a recording and/or reproducing opening part 24 is provided in the front part of the cartridge main body. In the cartridge main body 4, the driving opening part 24 and a shutter member 16 for opening/closing the recording and/or reproducing opening part are disposed, and by disposing a protective sheet 55 between the disk 5 and the shutter member 16, contact between the disk 5 and the shutter member 16 is prevented.
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公开(公告)号：JP2000268512A
公开(公告)日：2000-09-29
申请号：JP6689599
申请日：1999-03-12
Applicant: SONY CORP
Inventor： MORITA OSAMI
IPC: G11B21/02
Abstract: PROBLEM TO BE SOLVED: To obtain a disk device capable of stably recording and/or reproducing information even after being given an impact without damaging the signal recording surface of an information recording medium even if the impact is given thereto. SOLUTION: This disk device has a supporting means 15 for supporting the element for recording and/or reproducing the information of a disk-shaped information recording medium 5. The device is so constituted that the contact surfaces 115c and 115d of the supporting means 5 facing the outer peripheral end of the information recording medium 5 are reparated from each other more as going toward the inner periphery of the information recording medium 5 with respect to its respective surfaces.
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公开(公告)号：JPH11348048A
公开(公告)日：1999-12-21
申请号：JP15795598
申请日：1998-06-05
Applicant: SONY CORP
Inventor： MORITA OSAMI , ISHIDA TAKEHISA , SUEMATSU NOBUO , KAWASHIMA YOSHINARI , KOSHIMURA AKIRA
Abstract: PROBLEM TO BE SOLVED: To provide a mold for molding a board, which can mold the resin board of a recording medium capable of reducing wear caused by friction with a head slider as small as possible and capable of improving its repeat durability. SOLUTION: In a stamper 1, at least a recording layer is formed on a board made of resin material. The stamper is used for molding the board of a recording medium, the surface of which has an information recording region, in which the recording of information signals and/or its regeneration and performed with a head slider equipped with a recording and regenerating element under a floating state when the stamper rotates, and a contact region, in which the head slider comes into contact with the stamper when the stamper stops. This stamper 1 has an information recording region forming region 2 corresponding to the information recording of the recording medium and a contact region forming region 3 corresponding to the contact region of the recording medium on its molding surface. In addition, in this contact region forming region 3, a predetermined uneven pattern produced by regularly arranging recessed parts 3a under the condition that the area occupied by these recessed parts 3a is set to be 0.8-5.75% of the total area of the contact region forming region 3.
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Patent Agency Ranking
公开(公告)号：JPH11328662A
公开(公告)日：1999-11-30
申请号：JP13396098
申请日：1998-05-15
Applicant: SONY CORP
Inventor： MORITA OSAMI
IPC: G11B5/82
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium and a magnetic recording apparatus in which a recording blur can be removed, in which a perpendicular magnetic recording system can be adopted effectively even by using a single- layer-film structure and in which a high-density recording operation can be realized. SOLUTION: An information signal is recorded on a magnetic disk 3 by a recording head 8a which is mounted on a head slider a part of which is levitated in a recording operation. In the magnetic disk 3, a magnetic layer 14 which is provided with perpendicular magnetic anisotropy is formed on a substrate 13. Prescribed uneven patterns are formed on the surface of a disk medium. A width size W1 in a direction at right angles to the running direction of the recording head 8a in a protruding part 3a out of the prescribed uneven parts is at the recording track width size W2 or lower of the recording head 8a. The information signal is recorded on the protruding part 3a by the recording head 8a according to a perpendicular magnetic recording system.
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公开(公告)号：JPH11328602A
公开(公告)日：1999-11-30
申请号：JP13576698
申请日：1998-05-18
Applicant: SONY CORP
Inventor： MORITA OSAMI , TANAKA SHOJI
Abstract: PROBLEM TO BE SOLVED: To realize magnetization of an adequate stake of a PERM disk(Pre- Embossed Rigid Magnetic Disk). SOLUTION: For magnetization of a PERM disk, the coersive force Hc of a PERM disk 1, thickness d, coersive force rectangular shape ratio S*, level difference d of disk surface, magnetic gap length g of magnetic head 12 for magnetization, recording efficiency η, number of turns n of coil, floating amount h, current supplied to magnetic head for magnetization are determined to satisfy the equations I and II.
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公开(公告)号：JPH1166557A
公开(公告)日：1999-03-09
申请号：JP22975697
申请日：1997-08-26
Applicant: SONY CORP
Inventor： MORITA OSAMI
IPC: G11B5/84
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing and inspecting a substrate formation matrix wherein a defect such as a hole present in a prototype, particularly, a defect immediately below a front face and in the vicinity of the front face of the matrix is not exposed to the front face because of a break of a film between the front face and defect during the formation of a substrate, and a disk substrate formed of the substrate formation matrix. SOLUTION: According to this manufacture, a substrate formation matrix 1 is manufactured by forming a substrate formation film 3 on a base 2. The substrate formation film 3 is obtained at least through a first film formation process of forming a first film on the base, a pressure process of pressuring the base and first film, a second film formation process of forming a second film on the pressured first film, and a polish process of polishing at least a front face of the second film.
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公开(公告)号：JPH10302256A
公开(公告)日：1998-11-13
申请号：JP10951097
申请日：1997-04-25
Applicant: SONY CORP
Inventor： OYANAGI HIDEKI , MORITA OSAMI , ISHIDA TAKEHISA
Abstract: PROBLEM TO BE SOLVED: To enhance the reliability of a disc by forming an irregular shape on the molding surface while differentiating the height of a row of pits in a contact region from the height of irregularities in an information recording region thereby sustaining a stabilized floating attitude when a head slider slides from the contact region to the information recording region. SOLUTION: In the molding die 10 for a disc substrate provided with an irregular part for recording information on the surface and a row of pits contacting a head slider in the inner or outer circumference thereof, an irregular shape is formed on a molding surface 11 while differentiating the height of irregularities for molding an irregular part from that of irregularities for molding the row of pits. The molding die 10 is made of a highly heat resistant material having high hardness, e.g. a cobaltless superfine particle tungsten alloy or SUS 440 series stainless steel, and a row of discrete magnetic disc CSS zone pits or irregularities 11a, 11b for molding an irregular part in data zone are provided in the molding surface 11. An injection molder or a compression molder is provided with the molding die 10 thus molding a disc substrate directly without requiring any stamper.
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公开(公告)号：JPH10255407A
公开(公告)日：1998-09-25
申请号：JP6153397
申请日：1997-03-14
Applicant: SONY CORP
Inventor： TANAKA SHOJI , MORITA OSAMI
Abstract: PROBLEM TO BE SOLVED: To provide a ROM type magnetic disk medium using an embossed pattern suppressing floating fluctuation of a slider, its code conversion method and signal recording method. SOLUTION: This method is a code conversion method ϕ applied to manufacture of the ROM type magnetic disk medium 3 using the embossed pattern and making correspond a conversion code Ec for the embossed pattern based on a source code Sd of a K-bit (K is integer) length, and code converts for a source code Sd by selecting a conversion code Ec from conversion codes of L bit (L is integer, and L>K) length and corresponding, and the DSV value of the selected conversion code Ec is code-converted so as to be satisfied with DSV=L×(R-1)/(R+1) related to an island/sea ratio R being a given condition.
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