Ricoh Company, Ltd.

Kabushiki Kaisha Ricoh

Ricoh Seiki Company, Ltd.

Ricoh Company Company, Ltd.

Wasaburo Ohta

Mikio Kinoshita

Shinji Yagawara

Masashi Nakazawa

Koji Hirakura

Takamichi Enomoto

Junji Manaka

Fuyuhiko Matsumoto

Kiyohiro Uehara

Satoru Tomita

Tatsuya Sato

Tadao Katsuragawa

Toru Miyabori

Masaaki Nomura

Hitoshi Nakamura

Yujiro Kaneko

Yutaka Ebi

Haruo Iimura

Kenya Yokoi

Akihiko Kanemoto

Sumio Kamoi

Itsuo Ikeda

Isao Miyamoto

Kazuhiro Umeki

Tsutomu Ishida

Takaaki Miyashita

Tamio Ohori

Shuichi Karasawa

Zenjiro Okuno

Michiaki Shinozuka

Masaaki Ishiyama

Isamu Orima

Tamio Ohhori

Tadao Katuragawa

Toshihiko Yoshio

Yuuzi Onodera

Yuzi Onodera

Tatsuya Watanabe

A thin film magnetic head has a lower magnetic pole formed on a substrate; a coil arranged on the lower magnetic pole through an adhesive layer; an upper magnetic pole arranged on the coil; and a gap layer formed between the upper and lower magnetic poles. A method for forming the thin film magnetic head has a process for forming a lower magnetic pole on a first substrate; a process for forming a coil on a second substrate having a recessed portion; a process for polishing the first and/or second substrate such that a face of the lower magnetic pole on the first substrate and a face of the coil on the second substrate come in close contact with each other; a process for adhering the first and second substrates to each other such that the lower magnetic pole and the coil are adjacent to each other; a process for forming a gap layer on the lower magnetic pole; a process for polishing or etching a portion or all of the second substrate; and a process for forming an upper magnetic pole. In this magnetic head and the forming method, high performance can be obtained and cost of the thin film magnetic head can be reduced.

Method of forming a thin film magnetic head

A thin film deposition system includes a vacuum or evacuated casing in which there is introduced an active gas or an inert gas or a mixture thereof. A filament emits thermions which impinge upon gas molecules to ionize them into positive ions. The ions bombard a target, from which particles are emitted toward a substrate. The particles emitted from the target are also ionized by the thermions. In the vicinity of a grid, more particles from the target are ionized by thermions which are vertically oscillated and ionized molecules of the gas. The ions are accelerated toward the substrate and bombard the substrate, thereby depositing a thin film thereon. The thin film deposition system may additionally have an evaporation source for supporting an evaporant which emit particles to be deposited on the substrate.

Thin film deposition system

An optical information recording medium, for writing in and reading out information by a laser beam, is composed of a recording layer, an anti-reflection layer structure formed on an outer surface section on which the laser beam is directed to be focused, on the recording layer, and the anti-reflection layer structure includes one or more transparent electroconductive film layers.

Optical information recording medium

A gas sensor includes a substrate, a heater member formed on the base member, a gas sensitive structure formed on the heater member by a process comprising the following steps of forming a stacked layer structure on the heater member, the stacked layer structure including at least a metal-oxide semiconductor layer and an insulating film, and carrying out a heat treatment with respect to the stacked layer structure so that a constituent of the insulating film is diffused in spaces among crystal particles of the metal-oxide semiconductor layer, and electrode layers are in contact with the gas sensitive structure.

Gas sensor having metal-oxide semiconductor layer

An optical information recording medium is composed of a transparent substrate, a recording layer provided on the substrate, which is transparent with respect to a light beam for reproducing information recorded in the recording layer, a reflection layer provided on the recording layer, and an anti-reflection layer provided on the back side of the substrate opposite to the recording layer. The anti-reflection layer is composed of a plurality of overlaid layers, and at least one of the layers being a transparent electroconductive layer and the other layers are transparent insulating layers.

Optical information recording medium having multi-layered structures for

A gas sensor senses gas using a metal oxide semiconductor whose resistance changes depending on gas adhesion on a surface of the metal oxide semiconductor. The gas sensor includes a base structure, and a gas sensitive layer formed on the base structure and made of a metal oxide semiconductor. The gas sensitive layer has a multi-layer structure which includes at least two layer portions having mutually different grain structures.

Thin film gas sensor

An apparatus for forming a thin film has a vacuum container to which an active gas, an inert gas or a mixture thereof is introduced, and a source of evaporation from which a substance is evaporated. A counter electrode is disposed in the vacuum container for holding a substrate for forming a thin film thereon in such a manner as to be opposed to the source of evaporation. A grid is disposed between the source of evaporation and the counter electrode and having openings which allow the evaporated substance to pass therethrough. A filament for thermionic emission is disposed between the grid and the source of evaporation. A target is also disposed between the filament and the source of evaporation for emitting sputtered particles. A power source device establishes predetermined electric potential relationships between the grid, the filament, and the target.

Thin film forming apparatus

A thin film deposition system includes an evacuated casing in which there is introduced an active gas or an inert gas or a mixture thereof. An evaporant carried by an evaporation source in the evacuated casing is evaporated and travels toward a substrate supported on the electrode. A filament for emitting thermions is disposed between the evaporation source and the electrode, and a grid for passing the evaporated material therethrough is disposed between the filament and the electrode. Power supplies are electrically connected to the evacuated casing, the evaporation source, the electrode, the filament, and the grid, for keeping the filament negative in potential with respect to the evacuated casing and the grid. Alternatively, the evacuated casing may not be connected to the power supplies so that the grid is kept positive with respect to the filament. The grid may be of a double-layer structure, with the gas inlet means connected to the grid.

An apparatus for forming a thin film having a vacuum container evacuated to high vacuum and receiving a gas for vapor deposition, a generation device for generating a material vapor, a counter electrode holding a substrate to be vapor-deposited, a first grid disposed between the generation device and the electrode for accelerating the vapor, and a filament for emitting thermions to ionize the vapor. The grid and counter electrode surfaces may be curved and parallel to each other, and a second grid for accelerating the vapor, having a potential which is negative with respect to the potential of the first grid, may be placed between the first grid and the electrode, in the vicinity of the electrode, and a device may be provided for moving the first grid with respect to the electrode on a predetermined track.

Apparatus for forming a thin film

A thin film forming apparatus for forming a thin film on a substrate with a vaporized source material being supplied from an external material supplying unit. The thin film forming apparatus comprises a vacuum chamber for providing a vacuum pressure at which the vaporized source material is deposited on the substrate, a material supplying part for supplying particles constituting the vaporized source material to the vacuum chamber, an electrode for holding the substrate, a grid for allowing the particles to travel from the material supplying part to the electrode through the grid, a filament for generating thermions to ionize the particles, a power supply for applying a voltage to the grid so that the grid has a positive potential when measured with respect to the electrode and with respect to the filament, a plurality of openings being formed on the material supplying part for directing the emitted particles from the plurality of openings toward the substrate, and an emission uniforming material for uniforming the quantity of the emitted particles.

A gas detecting device includes a substrate and a plurality of gas sensitive elements supported by the substrate. A plurality of predetermined temperatures at which gases are detected are provided. The gas detecting device also includes a plurality of pairs of electrode leads supported by the substrate, each of the plurality of pairs of electrodes being connected to a corresponding one of the gas sensitive elements, and heater leads that are supported by the substrate and heat the plurality of gas sensitive elements so that each of the gas sensitive elements is set at a corresponding one of the plurality of predetermined temperatures.

Gas detecting device

A gas detecting device includes a substrate and a plurality of overhang portions made from an electric insulation material and disposed in a space over the substrate. A gas sensitive film is made from a metallic oxide semiconductor material and is mounted on each of the overhang portions. A pair of detecting leads is connected to the gas sensitive film. A heater lead for heating the gas sensitive film is mounted on each of the overhang portions. The gas sensitive film of at least one of the plurality of overhang portions has a composition ratio of metal to oxygen different from that of the other gas sensitive films whereby a specified gas can be selectively detected on the basis of the response of the plurality of metallic oxide semiconductors to the gas.

A gas detecting device includes a substrate, an insulator layer formed on the substrate, a gas sensitive layer formed the insulator layer, a pair of detection leads formed on the insulator layer, the gas sensitive layer partially overlying the pair of detection leads, a signal derived from the gas sensitive layer being sent to an external circuit through the pair of detection leads, a heater member arranged on the insulator layer in the vicinity of the gas sensitive layer, and an insulation coating layer formed on the pair of detection leads and the heater member, and partially overlying the gas sensitive layer so that the gas sensitive layer is put between the insulator layer and the insulation coating layer, and a portion of an upper surface of the gas sensitive layer is exposed to gas.

A gas detecting device includes a substrate, an insulating layer supported by the substrate, first and second pairs of detection leads formed on the insulating layer, a heater lead formed on the insulating layer, the first and second pairs of detection leads being heated by passing a heater driving current through the heater lead, a gas sensitive layer formed of a gas sensitive material and provided so as to partially make contact with the first and second pairs of detection leads, and a passivation layer formed so as to cover the first and second pairs of detection leads and the heater lead. A gas detection signal is output from the gas sensitive layer through one of the first and second pairs of detection leads. A gas detecting system including the above gas detecting device is also provided.

Gas detecting device and gas detecting system using the same

An apparatus for forming thin film includes a vacuum container to which an active gas, an inert gas, or a mixture thereof is introduced, a source of evaporation for evaporating a substance being evaporated in the vacuum container, a counter electrode disposed in the vacuum container and holding a substrate for forming a thin film thereon in such a manner as to be opposed to the source of evaporation, a grid disposed between the source of evaporation and the counter electrode and having openings which allow the substance being evaporated to pass therethrough, a filament for thermionic emission disposed between the grid and the source of evaporation and a power source device for establishing a predetermined electric potential relationship between the grid, the counter electrode, and the filament.

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Yokohama, Japan

Wasaburo Ohta