Sony Corporation

Tomio Kobayashi

Kazuya Hayashibe

Tatsuo Kumura

Heikichi Sato

Kazushi Yamauchi

Hideo Suyama

Hideaki Hanaoka

Muneyuki Ogata

Shoichi Kano

Junichi Saito

Yoshihiro Oshima

Yoshito Ikeda

Yoshihito Fukushima

Hirofumi Kondo

Yusuke Suzuki

Makoto Kubota

Hiroichi Ishikawa

Hideaki Ojima

Akira Urai

Hiroyuki Suzukawa

Toshiyuki Okada

Yoshimi Takahashi

Shinobu Mitsuhashi

Osamu Maniwa

Akira Murakami

Iwao Abe

Kazuo Nozawa

Kazuhiko Morisawa

Yoshiharu Honjo

Barret Lippey

Masataka Yamashita

Hidesuke Miyairi

Koichi Kaneko

Kazuo Kashiwa

Hatsue Koishikawa

Yukihiro Aizawa

Fumiko Kagawa, Legal Representative

Mitsuaki Yokomizo

Seiki Konno

The invention provides a fine particle dispersion composition that does not depend on a curing method and that has adaptability to the curing methods and versatility and can provide a highly transparent optical component, an optical component using the fine particle dispersion composition and a method of manufacturing the same, and an optical film laminate using the optical component, and also provides a polarization splitting device using the optical component. In order to achieve the above, there is provided an optical component, which is obtained by curing a fine particle dispersion composition, which comprises metal-oxide fine particles, an organic resin material adapted to cure by absorbing energy, one of a polyoxyethylene alkyl ether phosphoric acid-based surfactant and a polyoxyethylene alkyl ether carboxylic acid-based surfactant, each of which has a molecular weight of 500 or more, and an organic solvent.

Fine particle dispersion composition, optical component, optical film laminate, polarization splitting device, and method for manufacturing the optical component

Disclosed is an antireflection film used to be stuck on the surface of a glass panel of a CRT, which can be inexpensively manufactured at a high productivity while satisfying all of requirements regarding its adhesive strength, reflectance characteristic, electric resistance and total light transmittance. The antireflection film is formed by stacking silicon oxide films and indium tin oxide films on a base film in multilevels, wherein the thickness of the uppermost silicon oxide film of the antireflection film is thicker than the indium tin oxide film directly under the uppermost silicon oxide film, and the lowermost silicon oxide film, positioned at the interface with the base film, of the antireflection film is a SiO,film where the value x is in a range of 0.5 to 1.9.

Antireflection film and manufacturing method thereof

A composition for forming an antifouling film or an optical component having such an antifouling film, for example, an anti-reflection filter, contains an alkoxysilane compound having a perfluoropolyether group indicated by the following general formula (1):

Composition for forming antifouling antifouling film, optical component,

A anti-reflection member provided with an antistatic function and an electromagnetic radiation shielding function and having a reflection preventing optical thin film excellent in adhesion with the hard coat layer. The anti-reflection member comprises a laminate composed of substrate, hard coat layer, and reflection preventing optical thin film having at least two layers, the first layer of the reflection preventing optical thin film provided in contact with the hard coat layer comprises a transparent conductive oxide film (for example, SnO.sub.2, ZnO, In.sub.2 O.sub.3, or ITO) formed by reactive physical vapor phase deposition, and the second layer of the reflection preventing optical thin film consists of a material (for example, SiO.sub.2 or MgF.sub.2) having a refractive index smaller than that of the first layer.

Anti-reflection member, manufacturing method thereof, and cathode-ray

A magneto-resistance effect type magnetic head having high output can be obtained as a reproduction head for a rotating drum type VTR by only providing a conventional rotary transformer with a rotor and a stator for supplying a bias current without a need for a special mechanism for transmitting a direct current. There is provided a magneto-resistance effect type magnetic head device to be mounted on a rotating drum having a bias conductor and a sense conductor, including a rotary transformer connected to the bias and sense conductors wherein an alternating current having a frequency lower than the frequency of a recording signal is applied to at least one of stator channels facing rotor channels of the rotary transformer. A current is applied to at least either the bias conductor or sense conductor at the stator side of the rotary transformer to produce a non-direct current at a terminal on the rotor side of the rotary transformer connected to the magneto-resistance effect type magnetic head only in a time zone when the magneto-resistance effect type magnetic head is not required to reproduce the recording signal and to produce a direct current at a terminal on the rotor side in a time zone when the recording signal must be reproduced.

Magneto-resistive effect type magnetic head device

Magneto-resistance effect type magnetic head device

Each of a pair of magnetic core halves includes a substrate and a thin magnetic metal film formed on the substrate. The substrate is notched with a winding groove. The pair of the magnetic core halves are integrally bonded to each other so that a gap filling film is formed between the facing surfaces of the thin magnetic metal films. The zero depth position of the magnetic gap which is determined by the length of the facing thin magnetic metal films is offset to a magnetic recording medium sliding surface of the magnetic head from the notching start position of the winding groove on the side of the magnetic gap. Hence, the shape of the thin magnetic metal film exposed on the magnetic recording medium sliding surface is maintained constant from the initial position to the depth zero position.

Magnetic head having a notched magnetic core portion with a zero depth

A thin film magnetic head whereby the inclined surface is formed with a prescribed angle relative to the upper surface of the substrate in the vicinity of a slide contact surface thereof with a magnetic recording medium, the magnetic gap is formed on the magnetic film on the inclined surface, and the azimuth of the magnetic gap is set by the inclined surface. By forming grooves or protrusions on the substrate, the inclined surface by which the azimuth of the magnetic gap is set is defined. A coil conductor is formed on the flat portion of the upper surface of the substrate. With the thin film magnetic head presented by this invention, a double azimuth thin film magnetic head of a multi-channel thin film magnetic head can be easily provided.

Thin film magnetic head

A magnetic transducer head in which the magnetic core elements of ferromagnetic oxides are sliced obliquely across the junction surface of the core elements, ferromagnetic metal thin films are formed on the resulting inclined surfaces by employing a physical vapor deposition, and the core elements are placed with the respective ferromagnetic metal thin films abutting to each other for defining a magnetic gap therebetween, wherein the improvement consists in that said inclined surfaces with the ferromagnetic metal thin films formed thereon are inclined at a preset angle with the magnetic gap forming surface, in that non-magnetic films having high-hardness are interposed between the ferromagnetic oxide and the ferromagnetic metal thin films, and in that said ferromagnetic metal thin films and the oxide glass fillers are provided on the tape abutment surface by the intermediary of the non-magnetic film having high-hardness. The provision of the non-magnetic film having high-hardness between the ferromagnetic oxide and the ferromagnetic metal thin film is effective to inhibit the reaction otherwise occurring between the oxide and the films, while positively preventing the formation of the boundary layer with inferior magnetic properties. Likewise, the provision of the non-magnetic film having high-hardness between the ferromagnetic metal thin film and the oxide glass is effective to prevent the erosion of the film by the molten glass, while also improving the molten glass fluidity. It should be noted that the non-magnetic films having high-hardness may be provided on the interface only between the core elements and the metal thin films or on the interface only between the metal thin films and the oxide glass.

Magnetic transducer head with inclined magnetic gap

A magnetic transducer head wherein confronting surfaces of a pair of magnetic core parts comprised of a ferromagnetic oxide material are notched, and the notch defining surfaces have metallic ferromagnetic layers supported thereby. The method of physical vapor deposition as known per se is used for forming these layers. The transducer coupling gap of each magnetic head is defined by an aligned pair of pole piece layers formed from the deposited metallic ferromagnetic material. The pole piece layers are inclined at a preset angle with respect to the plane of the coupling gap, and have extensions formed of the deposited metallic ferromagnetic material presenting bend contours between the pole piece layers and the lateral sides of the core parts.

Magnetic transducer head

A magnetic transducer head comprising a first magnetic core element and a second magnetic core element, each of the first and second core elements comprising a magnetic ferrite block and a magnetic metal thin film integrated with the magnetic ferrite block. These core elements having a first planar surface and a second planar surface. The magnetic metal thin film being provided on the second planar surface and having an edge thereof facing to the first planar surface, and the second planar surface being slantly provided with respect to said first planar surface. These core elements being bonded together to form an operating magnetic gap between the edge of the magnetic metal thin film on the first core element and the edge of the magnetic metal thin film on the second core element. The magnetic metal thin film on the first core element or the magnetic thin film on the second core element is formed in one common plane. The magnetic metal thin film may be formed of the ferromagnetic metals including Fe--Al--Si alloys, amorphous metal alloys or permalloy. And the magnetic metal thin film having substantially uniform columnar grain structure or uniform magnetic anisotropy, over entire area of the film.

Magnetic transducer head having an alloy thin film of high saturation

A magnetic thin film consisting essentially of Fe, Al and Si and further containing nitrogen has high magnetic permeability and high hardness without lowering the magnetic properties such as saturation magnetic flux density or coercive force. The magnetic thin film has an increased specific resistivity and a lowered eddy current loss in the high frequency region and is suitable for a core material of magnetic transducer heads used in a high frequency region. The magnetic thin film is prepared by, for example, physical vapor deposition or ion implantation.

Magnetic thin film

A magnetic thin film consisting essentially of Fe, Al and Si and further containing oxygen has high magnetic permeability and high hardness without lowering the magnetic properties such as saturation magnetic flux density or coercive force. The magnetic thin film has an increased specific resistivity and a lowered eddy current loss in the high frequency region and is suitable for a core material of magnetic transducer heads used in a high frequency region. The magnetic thin film is prepared by, for example, physical vapor deposition or ion implantation.

A method of electrolytically etching a ferrite body wherein the body is immersed in an etching electrolyte of controlled concentration, an electrode is positioned in the electrolyte in spaced relation to the body, with the ratio of exposed surface area of the ferrite body and the confronting surface area of the electrode being within a predetermined range, and applying a unidirectional voltage between the ferrite body and the electrode, the ferrite body being at a negative voltage relative to the electrode for a sufficient time to cause the desired etching.

Method of electrolytically etching ferrite

A method of manufacturing a ferrite magnetic transducer head is disclosed, in which two Mn - Zn ferrite core blocks are bonded together with glass material containing Fe.sub.2 O.sub.3 and ZnO. By proper thermal treatment, homogeneous dispersion of fine precipitates of Zn - Fe - O is formed in the bonding glass.

Growing community of inventors

Kanagawa, Japan

Tomio Kobayashi