Sharp Kabushiki Kaisha Corporation

Other

Toppan Printing Co., Ltd.

Michinobu Mieda

Akira Takahashi

Junji Hirokane

Kenji Ohta

Junichiro Nakayama

Yoshiteru Murakami

Hiroyuki Katayama

Tetsuya Inui

Go Mori

Naoyasu Iketani

Kazuo Van

Tomoyuki Miyake

Toshihisa Deguchi

Junsaku Nakajima

Hideaki Sato

Akira Shibata

Toshikazu Nagaura

Yoshiyuki Nagahara

Yukinori Nishitani

Masaki Yamamoto

Hideharu Tajima

Shigeo Terashima

Nobuyuki Takamori

Junichi Washo

Masayasu Futagawa

Shinji Yamagami

Masanori Shimo

Ippei Suzuki

Hiroyuki Ikenaga

Toshihiko Sakai

Ikuo Nakano

Yutaka Unuma

Koji Sakairi

Hirotoshi Takemori

Yuji Maruo

Katsuyoshi Takahashi

Chie Hayashida

Hiroo Yoshidome

There is provided an electrophoresis device including an insulator that includes: a first-separating-medium storing section for storing therein a first separating medium; a first opening and a second opening that are in communication with the first-separating-medium storing section and for defining a direction of separation on the first separating medium; and a third opening that is covered with a penetrable insulating thin film, wherein the first separating medium storing section is in communication with outside via the first opening and the second opening. There is also provided an electrophoresis apparatus including the electrophoresis device. This realizes an electrophoresis apparatus, and a device therefor, that enables an operator to sample separated proteins without ever making contact with the electrophoresed gel, and that can easily be used with various types of analyses, thereby improving convenience of electrophoresis.

Electrophoresis apparatus and device therefor

There is provided a storage layer () between storage layers (), (). The storage layer () produces a relatively large spherical aberration for a protection layer thickness error. Information is written to or read from the storage layer () with a beam of light having a second wavelength. Information is written to or read from the storage layers (), () with a beam of light having a first wavelength (longer than the second wavelength). Accordingly, a multi-format optical storage medium is realized on which information can be recorded or reproduced with a single objective lens. Also, an optical pickup is realized which is capable of recording or reproducing information on the multi-format optical storage medium.

Multi-format optical storage medium, optical pickup, and optical read/write device

An optical disk includes a plurality of disk sheets which are laminated, and each of which has a recording face on one of the surfaces and a flat back surface, wherein the plurality of disk sheets are laminated by adhesive layers in such a manner that between adjacent two disk sheets, a back surface of one of the disk sheets, on the opposite side of the surface where the recording face is formed, faces the disk surface of the other disk sheet. The foregoing structure realizes an optical disk of desirable recording/reproducing characteristics, which is flat and has a fixed interval between recording faces, and which permits the problems of coma aberration, spherical aberration, etc., to be suppressed.

Optical disk and optical disk recording and reproducing device

By using an existing, relatively inexpensive manufacturing device, micropatterns (e.g. guiding grooves, prepits) having such track pitch and pit pitch that are smaller than the diameter of a light spot are formed more finely. There are provided at least two layers, i.e. (i) a resin substrate and (ii) a depressed part inducing layer made of dielectric material or metal oxide. A light beam is radiated and focused onto the depressed part inducing layer so as to form pit parts and/or guiding grooves on irradiated parts of the resin substrate. The depressed part inducing layer is then removed, so as to expose the pit parts and/or guiding grooves.

Method of forming micropattern, method of manufacturing optical recording medium master copy, optical recording medium master copy, optical recording medium stamper, and optical recording medium

A method for forming micropatterns includes forming a thin film consisting of a single layer or of plural layers on a substrate, irradiating an energy beam to the thin film to elevate the temperature of a region to a predetermined temperature or higher to thereby modify the region of the thin film, and patterning the thin film at least in such a manner to leave over the modified region.

Method for forming micropatterns

A magneto-optical storage medium includes an interference layer, a magnetic domain expansion layer, an intermediate layer, a magnetic masking layer, a recording layer, and a protection layer which are sequentially formed on a substrate. The magnetic domain expansion layer produces a smaller frictional force due to wall coercivity than do the other magnetic layers. The intermediate layer has the Curie temperature T which is lower than those of the other magnetic layers. The magnetic masking layer is in a perpendicular magnetization state at temperatures that are in a proximity of T , and changes into an in-plane magnetization state at temperatures that are higher than the proximity of T . The recording layer produces a higher coercive force than those produced by the magnetic domain expansion layer at room temperature.

Magneto-optical storage media

In order to provide a magneto-optical recording medium which can select a single recording magnetic domain in the recording layer accurately and expand and transfer the same to the reproducing layer, the magneto-optical recording medium is arranged in the following manner. That is, the magnetization direction of the reproducing layer is in-plane at room temperature and shifts to perpendicular at or above a predetermined temperature T . The recording layer is a magnetic layer which is magneto-statically coupled to the reproducing layer and shows the perpendicular magnetization up to its Curie temperature. The magnetic mask layer is provided between the recording layer and reproducing layer, and the magnetization thereof is reduced to 0 (zero) at or above a predetermined temperature (T ) which is at or above T . The magnetization of the magnetic mask layer is larger than that of the recording layer at least in a range between room temperature and T .

Magneto-optical recording medium

A reproduction layer, a magnetic domain extending layer, an intermediate layer, and a recording layer are formed in this order. The magnetic domain extending layer, the intermediate layer, and the recording layer are exchange-coupled. The intermediate layer has a Curie temperature lower than that of any other magnetic layer. A non-magnetic intermediate layer is formed between the reproduction layer and the magnetic domain extending layer. Upon reproduction, magnetization information in the recording layer is transferred to and extended in the magnetic domain extending layer, where an extended magnetic domain is formed. The reproduction layer is magnetostatically coupled with the magnetic domain extending layer, so that the extended magnetic domain is transferred to the reproduction layer. This makes it possible to provide a magneto-optical recording medium characterized in moving of magnetic domain walls and extension of magnetic domains in good conditions, and increased signal intensity with a simpler structure.

An optical disk has address recording sections each of which has a wobbled part of one of side walls of a groove. Each address recording section is formed by providing convexes of a groove in an adjacent land so as to widen the groove. With the wobbles thus provided in a concavo-convex form, address information is recorded. Besides, the address recording sections thus provided in the grooves are linearly disposed in radial directions of the optical disk. By thus arranging the optical disk on whose grooves and/or lands information is recorded, mixing of wobble frequency components in reproduced information signals does not occur, the sector method is applicable to the optical disk, and information signals of high quality can be obtained.

Optical recording medium having tracks, each track having a plurality of wobble sections/one-side wobble regions

A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.

Magneto-optical recording medium having intermediate layer of in plane magnetization

Magneto-optical recording medium having intermediate layer of in-plane

An optical disk of the present invention includes a transparent dielectric film formed on a light incident side of the disk on an opposite side of an optical recording film so as to sandwich the transparent substrate therebetween, for suppressing bimetallic effects caused by a difference in thermal expansion between an optical recording film formed on an optical recording surface and the transparent substrate, whereby changes in tilt against temperature changes can be suppressed. Further, by an optimal selection of a reflectance of the transparent dielectric film, unwanted reflection due to multi-interference can be reduced at the same time.

Optical recording disk capable of suppressing bimetallic effects caused

In an optical disk, grooves and lands serving as recording tracks are provided, the grooves are shaped so as to have virtually the same width, and in a first region, the two side walls of each groove wind in accordance with address information. The first region of the groove is formed with its leading portion located at the same angular position as the leading portion of at least one of the first regions of the adjacent grooves. Moreover, the winding portions corresponding to respective bits of the address information are formed in a manner so as to synchronize to the adjacent grooves. With this arrangement, it becomes possible to easily detect address information from the grooves and lands, and consequently to obtain an information reproducing signal with high quality.

Optical disk having virtually constant width recording track and optical

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Shiki-gun, Japan

Michinobu Mieda