Fuji Photo Film Company, Limited

Fuji Photo Co., Ltd.

Goro Akashi

Tatsuji Kitamoto

Masaaki Fujiyama

Yasuyuki Yamada

Ryuji Shirahata

Osamu Suzuki

Yasuo Tamai

Makoto Nagao

Masashi Aonuma

Akira Nahara

Akira Kasuga

Koji Sasazawa

Nobuo Tsuji

Toshimitu Okutu

Matsuaki Nakamura

Hiroshi Ogawa

Tsutomu Okita

Takahito Miyoshi

Nobutaka Yamaguchi

Yoshito Mukaida

Takamitsu Asai

Shin-Ichiro Dezawa

Masaru Sekine

Kenji Sega

Hiroshi Agawa

Kengo Oishi

Akihiro Matsufuji

Eiichi Tadokoro

Yoshihiro Arai

Tsunehiko Sato

Chiaki Mizuno

Kyoichi Naruo

Noburo Hibino

Masami Sato

Shigeo Komine

Kouichi Masaki

Kazuhiko Morita

Yasutoshi Okuzawa

Masaaki Takimoto

Masaaki Suzuki

Hiroshi Chikamasa

Shizuo Umemura

Hajime Miyatuka

Masahiro Utumi

Satoru Takayama

Takashi Saida

Kenji Watanabe

Wataru Ueno

Kazuhide Ishii

Shinichiro Dezawa

Masaki Suzuki, Deceased

A recording medium and method of performing recording/reproducing on the recording medium. The recording medium includes a multi-layer structure wherein at least two kinds of atomic layers are alternately laminated on a support. The elements of the atomic layers are selected so that they have secondary electron emission characteristics, such as secondary electron emission efficiency or secondary electron energy spectrums different from each other and do not form any alloy with each other, or so that a reacted mixture between the at least two kinds of atomic layers has secondary electron characteristics different from the atomic layers. The recording is performed by irradiating the surface of the recording medium with a recording beam selected from an electron beam, a charged particle beam, and a neutral particle beam to expose the next lower different kind of atomic layer of forma mixture. The reproducing is performed by irradiating the surface of the recording medium carrying information recorded thereon with a reproducing beam selected from the electron beam, a charged particle beam, and a neutral particle beam to emit secondary electrons from its surface thereof, and detecting the difference in the secondary electron emission characteristic between the emitted secondary electrons.

Recording medium and method of performing recording/producing on the

In a vacuum, recording is conducted by exposing a solid surface to a neutral particle beam or an ion beam modulated with a recording signal and converged, thereby to locally develop a change in composition on the solid surface. Then, reproducing is conducted by exposing said solid surface to an electron beam, an ion beam or a neutral particle beam which has been converged, thereby to emit electrons from the solid surface, and detecting the emitted electrons to read out the change in composition. If necessary, erasing is conducted by exposing the solid surface to the same beam as used in reproducing, thereby to eliminate the change in composition.

Recording and reproducing method by a change in composition on a solid

The perpendicular magnetic orientation of a magnetic layer containing platelet-form ferromagnetic particles coated on a web support is effectively performed by passing a web having thereon the coated magnetic layer in an undried state through a magnetic field formed by plural pairs of opposite pole type magnets disposed in the travelling direction of the web with a gap between adjacent pairs of magnets, while supplying drying air through each gap onto the surface of the travelling web to substantially complete the drying of the coated layer while the web is in the magnetic field. A partition may be inserted in each gap so that the lower end of the partition is close to the upper surface of the travelling web to divide the gap into a front section and a back section, and the drying air may be passed through these sections.

Process for producing magnetic recording medium

In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a binder, the ferromagnetic particles are given a magnetic anisotropy by a magnetic annealing treatment and the direction of the magnetic anisotropy is vertical mainly to the recording surface. Thus, the vertical magnetization recording is improved.

Magnetic recording medium

A multichannel magnetic recording/reproducing head for which the amount of waving of the tape is significantly reduced and contamination of the recording/reproducing gaps of the head by dust or the like is substantially eliminated. A plurality of parallel grooves are formed on a tape-contact surface of the head, inclined with respect to a running direction of the magnetic tape and provided at least at a tape-entrance side of the surface. The inclination of the grooves is within an angular range of 1 to 30 degrees with respect to the tape running direction, and the depth of the grooves is within a range of 0.1 to 20 microns.

Multichannel magnetic head

A magnetic recording medium comprising a substrate, a thin magnetic metal film having spaced-apart columnar grains deposited on the substrate, and an organic polymer formed in the space between the columnar grains and integrated therewith. The medium is prepared by impregnating the spaces between the columnar grains with organic monomers or oligomers and polymerizing them in the spaces.

Method of preparing a magnetic recording medium

A magnetic recording medium manufacturing apparatus is comprised of a cooling rotary cylinder can and a small roller, arranged adjacent to each other. A flexible endless belt is laid over the can and roller and carries a tape-shaped support. A ferromagnetic material, evaporated from an evaporation source disposed below the can and roller, is vacuum-deposited onto the tape-shaped support.

Apparatus for manufacturing magnetic recording media

The present invention relates to an improved method for preparing a magnetic recording method having excellent magnetic orientation comprising the steps of (1) dispersing ferromagnetic fine particles which are plate-shaped and which have an axis of magnetization perpendicular to the plates of the particles in a binder and (2) coating a magnetic coating layer on a non-magnetic support wherein the method comprises, after coating the magnetic coating layer and before drying it, subjecting the surface of the magnetic layer to a magnetic field from the direction perpendicular to the support to produce a magnetic orientation while contacting the surface of the magnetic layer with a flexible smoothening sheet.

Method for preparing a magnetic recording medium

A process for forming a vapor-deposited thin layer of organic material is disclosed. The process involves placing organic material on a support base within a vacuum chamber and providing a heat source in the vicinity of the organic material. A second support base is then provided within the vacuum chamber and heat is applied to the organic material at a temperature which causes the organic material to form vapors. The vapors are vapor-deposited on the second support base forming the thin layer of organic material. It is generally desirable to move both of the support bases during the vapor deposition process allowing the formation of a continuous uniform thin layer of organic material.

Method of forming thin vapor deposited film of organic material

A magnetic recording medium manufacturing apparatus is comprised of a cooling rotary cylinder can and a small roller, arranged adjacent to each other, and with the small roller being swingable about the central axis of the can. A flexible endless belt is laid over the can and roller and carries a tape-shaped support. A ferromagnetic material, evaporated from an evaporation source disposed below the can and roller, is vacuum-deposited onto the tape-shaped support.

Magnetic recording medium manufacturing apparatus

In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, an improvement consists in that the ferromagnetic particles have a mean particle length of at most 0.3 microns with a length to width ratio of more than 1 but at most 3 and optionally are subjected to an orientation treatment in a magnetic field in the vertical direction to the recording surface.

In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, the ferromagnetic particles are cubic particles of 0.3 or less micron and are subjected to an orientation treatment in the vertical direction to the recording surface, whereby the output and S/N ratio in a high density recording are increased.

In a magnetic recording medium comprising a non-magnetic support and two or more magnetic recording layers containing ferromagnetic particles dispersed in a non-magnetic binder, the ferromagnetic particles of the outermost magnetic layer are given a main magnetic anisotropy by a magnetic annealing treatment and the direction of the magnetic anisotropy is vertical to the recording surface. Thus, the vertical magnetization recording is improved.

A magnetic recording medium which is characterized by a lubricant present in channels diagonally extending through a magnetic metal thin film having a columnar structure formed by vapor deposition; this medium possesses improved running properties and abrasion resistance which last for an extended period of time.

Magnetic recording media

A magnetic metal deposition material contained in a hearth is heated and evaporated in a vacuum to form a flow of vapor, which is then ionized and converged toward a predetermined deposition surface of a flexible substrate. The flexible substrate is moved obliquely downwardly along a convex course by sliding contact with the curved surface of a fixed curved guiding body between a pair of guide rollers located at different heights above the hearth. The fixed curved guiding body communicates with a coolant source for cooling the substrate moving in contact therewith and may be provided with oscillators. Thus a thin film of the magnetic metal is deposited on the convex surface of the substrate.

Apparatus for making a magnetic recording medium

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Odawara, Japan

Goro Akashi