Hitachi, Ltd.

Hitachi Koki Co., Ltd.

Hitachi Maxell, Limited

Hitachi Global Storage Technologies Japan, Ltd.

Hitachi Maxwell, Ltd.

Hitachi Global Storage Technologies

Yoshinori Miyamura

Takeshi Nakao

Masaaki Futamoto

Yoshibumi Matsuda

Hisashi Takano

Mikio Suzuki

Kyo Akagi

Fumio Kugiya

Hirotsugu Fukuoka

Takayuki Munemoto

Tokuho Takagaki

Toshio Kobayashi

Hideo Tanabe

Kazuo Shiiki

Naoki Koyama

Masahiro Kitada

Isamu Yuito

Ryoichi Nakatani

Noboru Shimizu

Eijin Moriwaki

Masahiro Ojima

Shinkichi Horigome

Motoyasu Terao

Norio Ohta

Kazuo Shigematsu

Yumiko Anzai

Seiji Yonezawa

Toshio Niihara

Harukazu Miyamoto

Shigeru Nakamura

Fumiyoshi Kirino

Yoshiaki Yazawa

Masahiko Takahashi

Ken Tsutsui

Terunori Warabisako

Yoshio Taniguchi

Keizo Kato

Shin-ichi Muramatsu

Tsuyoshi Uematsu

Junko Minemura

Hiroyuki Ohtsuka

Ryo Suzuki

Hirofumi Sukeda

Akira Arimoto

Toshimitsu Kaku

Seiichi Mita

Yutaka Sugita

Hideki Sawaguchi

Shigeo Moriyama

Nobuyuki Inaba

Yoshinori Takeuchi

Hiroaki Miwa

Kenji Mori

Ryoichi Sudo

Hajime Aoi

Yuzo Yamaguchi

Takashi Toyooka

Hiroshi Shiraishi

Yasuhide Ouchi

Tsuneo Suganuma

Tetsuo Tajima

Yosuke Seo

Kiyoshi Matsumoto

Fumihiko Uchida

Yoshihiro Hamakawa

Masuo Kasai

Takashi Nishimura

Hiroshi Yasuoka

Eiichi Seya

Makoto Aihara

Youichi Kawakubo

Toyoji Okuwaki

Yoshimasa Kondo

Junko Nakamura

Takeshi Nakano

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Method for manufacturing magnetic head device

Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effect

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Magnetic head with conductors formed on endlayers of a multilayer film having magnetic layer coercive force difference

Magnetic disk apparatus including magnetic head having multilayered reproducing element using tunneling effect

A light concentrator photovoltaic module includes a medium having a light receiving plane, a plurality of photovoltaic elements arranged in a spaced relationship with the light receiving plane, and a light reflecting plane for conducting light incident upon the light receiving plane but is not directly received by the photovoltaic elements to the photovoltaic elements. The light reflecting plane has a structure as viewed on a cross section in a plane transverse to the module light receiving plane and traversing adjacent two photovoltaic elements and a light reflecting member therebetween such that the light reflecting plane includes, at least two first inclined planes and at least two second inclined planes, the first inclined planes being rightwardly ascending while the second inclined planes are leftwardly ascending, respectively, at least two first inclined planes being arranged on a right side of a middle point of a distance between the adjacent two photovoltaic elements while at least two second inclined planes being arranged on a left side of the middle point.

Light concentrator photovoltaic module method of manufacturing same and light concentrator photovoltaic system

Disclosed is a photovoltaic module including a plurality of concentrators each having a light-incident plane and a reflection plane, and photo detectors. Each photo detector is in contact with one of the concentrators. The module is capable of effectively trapping light and effectively generating power throughout the year even if the module is established such that sunlight at the equinoxes is made incident on the light-incident planes not in a perpendicular manner but instead obliquely, for example, in the case where the module is established in contact with a curved plane of a roof, or the like. In this module, each concentrator is formed into such a shape as to satisfy a relationship in which the light trapping efficiency of first incident light tilted rightwardly from the normal line of the light-incident plane in the cross-section including the light-incident plane, reflection plane and photo detector is larger than the light trapping efficiency of second incident light tilted leftwardly from the normal line in the above cross-section. Also, these concentrators are arranged in one direction.

Photovoltaic device, photovoltaic module and establishing method of photovoltaic system

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semicondutor or an antiferromagnetic material against the magnetic layers, and the magneto-resistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Magnetoresistance effect elements and magnetic heads using the tunneling magnetoresistive effect

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-denisity recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

Magnetoresistance effect multilayer film with ferromagnetic film

A magneto-optical recording medium comprises in combination: a magneto-optical recording layer capable of writing or erasing information by a laser beam and an external magnetic field and of reading the information by a Kerr effect; and a substrate having the magneto-optical recording layer formed thereon. The magneto-optical recording layer has at least two layers, including a first magneto-optical recording layer and a second magneto-optical recording layer which are magnetically coupled together. The first magneto-optical recording layer is a layer providing a greater magneto-optical effect in a short light wavelength range than the second magneto-optical recording layer though that having less perpendicular magnetic energy than this, as is provided on an irradiation side of the laser beam. It provides advantages in both the magneto-optical effect and perpendicular anisotropy in consideration of the thicknesses or compositions of the first and second magneto-optical recording layers.

Magneto-optical recording medium and method

It is disclosed that a longitudinal magnetic recording medium and apparatus has recording sections having longitudinal magnetic films magnetically isolated in a recording direction. The magnetically isolated recording sections can record a single bit each so that the longitudinal magnetic recording medium can remove the irregular domain boundary of its own caused on boundaries of magnetization reversals in the recording direction. This can improve the signal-to-media noise ratio to a great extent in writing and reading.

Longitudinal magnetic recording medium and apparatus

A magnetic recording medium, its fabrication method, and a magnetic recording apparatus in which both saturation induction and coercive force of a magnetic film is made high as they are near a surface of the recording medium. A high density information recording can be made higher than 50 kFCI in linear recording density even for spacing around 0.2 .mu.m.

Magnetic recording medium having at least two magnetic layers with easy

Multilayer magnetoresistance effect-type magnetic head

A method and device of head positioning in an information recording/reading device in which a magnetic recording medium with data tracks for recording information thereon is provided and a magnetic head is positioned on the data track to record/read out the information, wherein a data signal is recorded in the data recording layer of said recording medium, a servo signal is recorded in the servo signal recording layer located below said data signal recording layer, said data signal is read out using a data magnetic head whereas said servo signal is read out using a servo magnetic head, and the frequency of said servo signal is within the range of the gap-null frequency of said data magnetic head whereas the frequency of said data signal is within the range of the gap-null frequency of said servo magnetic head, and said magnetic head is positioned on the data track on the basis of said servo signal. A method and device of head positioning in an information recording/reading device in which a magnetic recording medium with data tracks for recording information thereon is provided and a magnetic head is positioned on the data track to record/read out the information, wherein the data tracks are discrete tracks in which adjacent data tracks are separated by a groove located therebetween, a data signal is recorded on the data track of said recording medium, a servo signal is recorded on the servo tracks of grooves between said adjacent data tracks, and said magnetic head is positioned on the data track on the basis of said servo signal.

Method of head positioning and magnetic recording disk drive using the

The present invention provides a hybrid lens having an axially asymmetrical non-spherical shape, good mass productivity, and excellent shape precision surface precision as well as environment resistant property, and a method for fabricating same, as well as a method and a device for a laser printer using that hybrid lens. In particular, there are disclosed a method, by which, when an axially asymmetrical non-spherical convex lens is formed by the replica method, the shape thereof is transcribed with a high precision, as well as a method and a device for fabricating an axially asymmetrical non-spherical concave lens (female die) serving as an original for the transcription. In a device for fabricating a female die by direct grinding, the positions of a rotation axis of an object to be worked and a rotation axis of a grinding wheel are controlled and it has further a function of correcting mounting errors, when the object to be worked and the grinding wheel are mounted.

Scanning optical device and method for making a hybrid scanning lens

The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magneto-resistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.

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Tokyo, Japan

Yoshinori Miyamura