Yamaha Corporation

Mitsubishi Denki Kabushiki Kaisha

Naoshi Horiai

Yasuaki Takano

Tadao Tokushima

Toshihisa Suzuki

Toshiyuki Oohashi

Toshitaka Fujii

Makoto Shiraki

Michihiko Kubota

An optical device is broken down into an optical element made of optical crystal and a holder made of alloy approximated in thermal expansion coefficient to the optical crystal, and the optical element is soldered to or melt bonded to the holder with a piece of solder or glass; the joint area is spaced from the periphery of the optical crystal so that a buffer area, which is spaced from the periphery, is created between the periphery and the joint area; even if cracks and/or scratches have been occurred in an end surface of the optical element, thermal stress is less influential in growing the scratches by virtue of the buffer area, and the optical device keeps the design optical characteristics.

Optical device free from stress due to difference in thermal expansion coefficient between parts and process for fabrication thereof

In order to realize a magnetic resistance device having a high magnetic resistance change rate, satisfactory production yield and a low level of variation in production, a pair of magnetic tunnel resistance devicesemploying a laminated structure comprised of antiferromagnetic film, lower magnetic layer, barrier filmand upper magnetic layerare independently and separately formed by ion beam etching on a lower electrodeand in common with said lower electrodeprovided on a substrate. A pair of independent upper electrodesare formed on upper magnetic layer. As a result, a pair of magnetic tunnel resistance devicesare formed connected in series on substrate

Magnetic resistance device

An optical device is broken down into an optical element made of optical crystal and a holder made of alloy approximated in thermal expansion coefficient to the optical crystal, and the optical element is soldered to or melt bonded to the holder with a piece of solder or glass; the joint area is spaced from the periphery of the optical crystal so that a buffer area, which is spaced from the periphery, is created between the periphery and the joint area; even if cracks and/or scratches have been occurred in an end surface of the optical element, thermal stress is less influential in growing the scratches by virtue of the buffer area, and the optical device.

A granule-type magnetoresistive material is used to form a MR component, which is equipped in a magnetic head, or the like. When placing the magnetoresistive material in the external magnetic field, the electric resistance is altered responsive to a variation of the external magnetic field. In order to increase a magnetic-field sensitivity, the magnetoresistive material is composed of an alloy whose atomic composition is expressed by a chemical formula of (Co.sub.1-x Fe.sub.x).sub.y Ag.sub.1-y, where 0.45.ltoreq.x.ltoreq.0.55 and 0.24.ltoreq.y.ltoreq.0.35; or another chemical formula of (Co.sub.1-x Fe.sub.x).sub.y (Ag.sub.1-z Cu.sub.z).sub.1-y, where 0.45.ltoreq.x.ltoreq.0.55, 0.24.ltoreq.y.ltoreq.0.35 and z.ltoreq.0.14.

Magnetoresistive material

Significant improvement in corrosion resistance of a magnetooptic material for electric and electronic applications is achieved by a composition (RE.sub.a, TM.sub.b)1-c-.sub.d M.sub.c Be.sub.d of specified content ratios of the components, typically a Tb-Fe-Co type alloy with combined addition of M and Be.

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Shizuoka, Japan

Naoshi Horiai