Seiko Epson Corporation

Osamu Kobayashi

Koji Akioka

Tatsuya Shimoda

Toshiyuki Ishibashi

Ryuichi Ozaki

Hiroshi Kato

Yasushi Mizoguchi

Toshiaki Yamagami

Akira Arai

Takatomo Fukumoto

Fumio Takagi

Seiji Ihara

Makiko Nakamura

Nobuyasu Kawai

A light deflector includes: a movable plate; an elastic support section having a first end coupled to the movable plate and adapted to support the movable plate rotatably around a predetermined axis; a support member coupled to a second end of the elastic support section; and a light absorbing section having a light absorbing property, wherein the elastic support section has an upper surface, a lower surface, and at least one side surfaces, each of the side surfaces being formed of one or more tilted surfaces existing outside either one of the upper surface and the lower surface, and the light absorbing section is disposed on the upper surface and the at least one side surfaces of the elastic support section.

Light deflector, method of manufacturing light deflector, and image display device

A developer carrier has concave portions regularly arranged on the surface thereof and being rotatable with a developer thereon. A contact member is made of an elastic rubber material, is in contact with the surface of the developer carrier, and vibrates with the rotation of the developer carrier. A value obtained by dividing a movement speed of the surface at the time of rotation of the developer carrier by a pitch of the concave portions in a peripheral direction of the developer carrier is smaller than a peak vibrational frequency of the contact member when a loss tangent obtained by dividing a loss elastic modulus of the contact member by a storage elastic modulus is the greatest.

Developing apparatus, image forming apparatus, image forming system and image forming method

A rare earth-iron series magnet formed from an alloy ingot using a one-step hot working process is provided. The alloy ingot includes between about 8 and 30 atomic percent of at least one rare earth element, between about 2 and 28 atomic percent of boron, less than about 50 atomic percent of cobalt, less than about 15 atomic percent of aluminum and the balance of iron and other impurities that are inevitably included during the preparation process. The alloy is cast to obtain a cast ingot and the hot working is performed on the cast ingot at a temperature of greater than about 500.degree. C. in order to make the crystal grains of the ingot fine and to align the axis of the grains in a desired direction.

Rare earth-iron series permanent magnets and method of preparation

A rare earth iron permanent magnet including at least one rare earth element, iron and boron as primary ingredients. The magnet can have an average grain diameter of less than or equal to about 150 .mu.m and a carbon content of less than or equal to about 400 ppm and a oxygen content of less than or equal to about 1000 ppm. The permanent magnet is prepared by casting a molten alloy. In one embodiment, the cast body is heat treated at a temperature of greater than or equal to about 250.degree. C. Alternatively, the material can be cast and hot worked at a temperature of greater than or equal to about 500.degree. C. Finally, the material can be cast, hot worked at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C. The magnets provided in accordance with the invention are relatively inexpensive to produce an have excellent performance characteristics.

Rare earth cast alloy permanent magnets and methods of preparation

A rare earth iron permanent magnet including at least one rare earth element, iron and boron as primary ingredients. The magnet can have an average grain diameter of less than or equal to about 150 .mu.m and a carbon content of less than or equal to about 400 ppm and content of less than or equal to about 1000 ppm. The permanent magnet is prepared by casting a molten alloy. In one embodiment, the cast body is heat treated at a temperature of greater than or equal to about 250.degree. C. Alternatively, the material can be cast and hot worked at a temperature of greater than or equal to about 500.degree. C. Finally, the material can be cast, hot worked at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C. The magnets provided in accordance with the invention are relatively inexpensive to produce an have excellent performance characteristics.

A rare earth iron permanent magnet including at least one rare earth element, iron and boron as primary ingredients. The magnet can have an average grain diameter of less than or equal to about 150 .mu.m and a carbon content of less than or equal to about 400 ppm and an oxygen content of less than or equal to about 1000 ppm. The permanent magnet is prepared by casting a molten alloy. In one embodiment, the cast body is heat treated at a temperature of greater than or equal to about 250.degree. C. Alternatively, the material can be cast and hot worked at a temperature of greater than or equal to about 500.degree. C. Finally, the material can be cast, hot worked at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C. The magnets provided in accordance with the invention are relatively inexpensive to produce an have excellent performance characteristics.

This invention relates to a permanent magnet having magnetic anisotropy given by means of a newly developed mechanical alignment and a manufacturing method thereof, and more particularly to a magnet comprising R (at least one rare-earth element selected from tile group consisting of Pr, Nd, Dy, Ce, La, Y and Tb), M (at least one transition metal selected from the group consisting of Fe, Co, Cu, Ag, Au, Ni and Zr) and X (at least one IIIb element of the periodic table selected from the group consisting of B, Ga and Al) and manufacturing method thereof, said alloy of R-M-X series, which composes basic component, are melted and cast, then cast ingot is hot-worked at the temperature above 500.degree. C. to remove or eliminate liquid phase of non-magnetic R-rich phase to concentrate magnetic phase, and to give magnetic anisotropy by means of mechanical alignment. It can provide magnet with excellent property comparable to that of the magnet provided by the conventional manufacturing method while applying cast hot-working heat treatment process which does not includes powdering process.

Permanent magnet and a manufacturing method thereof

Rare earth-iron series permanent magnets having sufficient coercive force to be used as permanent magnets are produced by casting an ingot of molten raw material containing at least one rare earth element, at least one transition metal element and boron. The ingot can be hot worked and/or heat treated and/or otherwise processed into a permanent magnet.

Permanent magnet and method of production

Method of producing a rare-earth permanent magnet

A rare earth-iron permanent magnet which is formed from an ingot of an alloy composed of at least one rare earth element represented by R, Fe, B and Cu, by the hot working at 500.degree. C. or above which refines the crystal grains and make them magnetically anisotropic. A process for producing a rare earth-iron permanent magnet by subjecting the ingot of said alloy to hot working at 500.degree. C. or above. The permanent magnet is equal or superior in magnetic performance to conventional permanent magnets produced by sintering method. The process is simple and able to provides permanent magnets of low price and high performance. In addition, an isotropic rare earth-iron permanent magnet is obtained if said ingot undergoes heat treatment at 250.degree. C. or above.

Rare earth-iron system permanent magnet and process for producing the

An anisotropic magnetic alloy having a columnar macrostructure is provided. The magnetic alloy is prepared by melting and casting an R-Fe-B alloy in order to make a magnetic alloy having a columnar macrostructure and heat treating the cast alloy at a temperature of greater than or equal to about 250.degree. C. in order to magnetically harden the magnetic alloy. Alternatively, the cast alloy can be hot processed at a temperature greater than or equal to about 500.degree. C. in order to align the axes of the crystal grains in a specific direction and make the magnetic alloy anisotropic. In another embodiment, the cast alloy can be hot processed at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C.

Magnetic alloy and method of production

An anisotropic rare earth-iron series permanent magnet having a columnar macrostructure is provided. The magnet is prepared by melting and casting an R-Fe-B alloy in order to make a magnet having a columnar macrostructure and heat treating the cast alloy at a temperature of greater than or equal to about 250.degree. C. in order to magnetically harden the magnet. Alternatively, the cast alloy can be hot processed at a temperature greater than or equal to about 500.degree. C. in order to align the axes of the crystal grains in a specific direction and make the magnet anisotropic. In another embodiment, the cast alloy can be hot processed at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C.

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Nagano, Japan

Osamu Kobayashi