公开(公告)号：DE602004020018D1

公开(公告)日：2009-04-30

申请号：DE602004020018

申请日：2004-05-27

Applicant: SONY CORP

Inventor： KOBAYASHI TOMIO ,  FUKUSHIMA YOSHIHITO ,  KAGAWA MASAKI ,  MORISAWA KAZUHIKO ,  KOISHIKAWA HATSUE

IPC: C08K3/22 ,  G02B1/04 ,  B05D7/24 ,  B32B7/02 ,  C08L63/00 ,  G02B1/11 ,  G02B5/30

Abstract: A fine particle dispersion composition comprises metal-oxide fine particles; an organic resin material adapted to cure by absorbing energy; one of polyoxyethylene alkyl ether phosphoric acid-based surfactant and a polyoxyethylene alkyl ether carboxylic acid-based surfactant (each having molecular weight of >= 500); and an organic solvent. The composition becomes an optical component when cured. Independent claims are included for the following: (1) an optical film laminate having several stacked optical films that differ in refractive index from one another. The optical film is obtained by curing the fine particle dispersion; (2) a polarization splitting device having a transparent base member having inclined plane surfaces formed in it by grooving, the inclined plane surfaces differing in inclination direction from each other. The inclined plane surfaces has a polarization splitting multilayer film formed on it. The transparent base member and/or the polarization splitting multilayer film is obtained by curing the fine particle dispersion composition; and (3) preparation of optical component involving performing dispersion treatment on metal-oxide fine particles, an organic resin material adapted to cure by absorbing energy; one of polyoxyethylene alkyl ether phosphoric acid-based surfactant and a polyoxyethylene alkyl ether carboxylic acid-based surfactant (each having molecular weight of >=500) in organic solvent together with high hardness metallic balls or ceramic balls; subsequently applying dispersion solution and evaporating the organic solvent.

公开(公告)号：JP2004354568A

公开(公告)日：2004-12-16

申请号：JP2003150551

申请日：2003-05-28

Applicant: Sony Corp ,  ソニー株式会社

Inventor： KOBAYASHI TOMIO ,  FUKUSHIMA YOSHIHITO ,  KAGAWA MASAKI ,  MORISAWA KAZUHIKO ,  KOISHIKAWA HATSUE

IPC: C08K3/22 ,  B05D7/24 ,  B32B7/02 ,  C08L63/00 ,  G02B1/04 ,  G02B1/11 ,  G02B5/30

CPC classification number: G02B5/3058 ,  G02B1/04 ,  G02B5/305 ,  Y10T428/24479 ,  Y10T428/24942 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/31504

Abstract: PROBLEM TO BE SOLVED: To provide a fine particle dispersion composition which has curing method-adapting versatility that is not influenced by a curing method and yields a highly transparent optical component, and to provide an optical component using the fine particle dispersion composition and its manufacturing method, and to further provide an optical film laminate having the optical component and a polarization splitting element having the optical component. SOLUTION: The optical component is obtained by curing the fine particle dispersion composition which contains: metal-oxide fine particles; organic resin material cured by absorbing energy; a polyoxyethylene alkyl ether phosphoric acid-based surfactant or a polyoxyethylene alkyl ether carboxylic acid-based surfactant which has a molecular weight of ≥500; and an organic solvent. COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JPH09167334A

公开(公告)日：1997-06-24

申请号：JP34810295

申请日：1995-12-15

Applicant: SONY CORP

Inventor： TAKANO MASAE ,  YOKOYAMA NAOKI ,  KOISHIKAWA HATSUE ,  ONO TOSHITSUGU

IPC: G11B5/702

Abstract: PROBLEM TO BE SOLVED: To reconcile durability and electromagnetic transducing characteristic by using a binder consisting essentially of nitrocellulose, a vinyl chloride-based copolymer and polyurethane for a magnetic layer and specifying the gel fraction. SOLUTION: The magnetic recording medium is constituted so as to form the magnetic layer 2 and a back coat layer 3 on both surfaces of a non-magnetic supporting body. The magnetic layer 2 contains a magnetic powder and the binder. The binder consists essentially of nitrocellulose, a vinyl chloride-based copolymer and polyurethane and has 80-95% gel fraction, where, the vinyl chloride-based copolymer preferably occupies >=70wt.% in the binder from the view point of obtaining the prescribed gel fraction, improving the dispersibility to the magnetic powder and imparting a sufficient coating film strength to the magnetic layer or the like.

公开(公告)号：JP2001307317A

公开(公告)日：2001-11-02

申请号：JP2000119985

申请日：2000-04-20

Applicant: SONY CORP

Inventor： OKAMOTO KAZUHIRO ,  SASAKI YUICHI ,  KOISHIKAWA HATSUE ,  OKAZAKI YUTAKA ,  MAEDA NAOTO ,  KAWASHIMA TAKASHI ,  KUDO TAKAO ,  GOTO KAZUO

IPC: G11B5/708 ,  G11B5/706

Abstract: PROBLEM TO BE SOLVED: To enhance durability and reliability by controlling the abrading amount and friction of a head by the high-speed sliding action to be effectively small while maintaining the high-density recording and high transferring rate of a multiple-layer-coated magnetic recording medium, particularly a magnetic disk. SOLUTION: Three kinds of powder consisting of cobalt-containing metallic powder, alumina powder and at least one other inorganic powder selected from inorganic powder of silicon compound, inorganic powder of titanium compound and powder of zirconium oxide are blended in an upper layer (a magnetic layer) 20 of the multiple-layer-coated magnetic disk 3.

公开(公告)号：JP2001291226A

公开(公告)日：2001-10-19

申请号：JP2000106977

申请日：2000-04-07

Applicant: SONY CORP

Inventor： SASAKI YUICHI ,  OKAMOTO KAZUHIRO ,  KOISHIKAWA HATSUE ,  GOTO KAZUO

IPC: G11B5/708

Abstract: PROBLEM TO BE SOLVED: To enhance durability and reliability by effectively restraining a magnetic disk and a magnetic head from wearing so much by high-speed sliding while keeping high-density recording and high transferring rate of a magnetic recording medium of multi-layer coating type, particularly a magnetic disk. SOLUTION: The upper layer (magnetic layer) 20 of the multi-layer coating type magnetic disk 3 contains nomnagnetic powder having 8 or higher Mohs' hardness and 0.2-0.6 μm average primary particle size. The centerline surface average roughness Ra of the surface of the layer 20 is 4 nm or smaller. Projections based on the nonmagnetic powder are formed on the surface of the layer 20 so that the projections having 10-50 nm height exist by 50-400 pieces/400 μm2 and those having higher than 50 nm height exist by 1-20 pieces/400 μm2.

公开(公告)号：JPH06301957A

公开(公告)日：1994-10-28

申请号：JP9338693

申请日：1993-04-20

Applicant: SONY CORP

Inventor： TAKAZAWA TAKAO ,  KOISHIKAWA HATSUE

IPC: C09D5/23 ,  C10M149/00 ,  C10N40/18 ,  G11B5/702 ,  G11B5/735

Abstract: PURPOSE:To obtain a magnetic recording medium which has superior magnetic properties and durability by using a polyvinyl acetal resin represented by a specific formula for a binder of the magnetic recording medium obtained by applying a magnetic paint mainly composed of ferromagnetic powders and the binder on a non-magnetic supporting body. CONSTITUTION:This is a magnetic recording medium having a magnetic paint mainly composed of ferromagnetic powders and a binder applied on a non- magnetic supporting body. The binder is constituted of a polyvinyl acetal resin represented in the formula in which k, l1, l2, m, n represent the constitutional ratio of monomers in mol.% and R is a hydrocarbon radical. k+l1+l2+m+n=100, 5