Hitachi Maxell, Limited

Hitachi, Ltd.

Other

Mitsubishi Kagaku Media Co., Ltd.

Toshinori Sugiyama

Masafumi Yoshihiro

Katsusuke Shimazaki

Osamu Ishizaki

Satoru Ohnuki

Tsuyoshi Maro

Akito Sakemoto

Norio Ohta

Yoshito Tanaka

Mitsuru Shimizu

Kazuko Ishitsuka

Yoshitane Tsuburaya

Kenjirou Kiyono

Reiji Tamura

Susumu Imai

Tetsurou Ikegaki

Hitoshi Watanabe

Shigeru Nakamura

Hisataka Sugiyama

Hirofumi Sukeda

Kazuo Shigematsu

Yoshito Tsunoda

Masahiro Ojima

Atsushi Yusa

Hiroyuki Awano

Masahiro Suzuki

Yasunori Kanazawa

Masashi Suenaga

Seiichi Matsushima

Tamotsu Iida

Masanori Kadotani

Toshiaki Taii

Yuji Yamazaki

Yoshitane Tuburaya

Shinichi Abe

Zenji Tsutsumi

Hideki Nagano

Nobuyuki Fujimoto

Ken Yoshizawa

Shinitsu Kinoshita

Hiroyuki Koike

Toshio Higashihara

Provided is an imprint method that includes the steps of softening resist in an object to be processed, by using compressed gas or supercritical fluid, the object including a substrate and the resist applied onto the substrate, and transferring a predetermined pattern onto the resist by pressing a mold that forms the predetermined pattern against the resist in the object.

Imprint manufacture method

An optical disk includes a recording region formed on a substrate for recording user data, and a management region formed on the substrate which includes an identification information region for recording disk-specific identification information such as address information (ID), a SYNC code, or an error detection code (EDC). The identification information region in this optical disk has a flat portion (a mirror region) formed by means of sectioning part of a groove or a land in a given step. The disk-specific identification information is recorded on the identification information region inclusive of this mirror region as irreversible record marks. Moreover, a signal of the disk-specific identification information is detected by a laser beam which is servoed on the recording track of this optical disk. Then, a change in the detected signal level of the disk-specific identification information is detected based on a predetermined threshold level.

Optical disk, method of playing optical disk, and optical disk drive

The object of the present invention is to provide a technology which has high compatibility and can provide users with conveniences. A new system recording mediumhas a center holeformed on a recording diskand a center holeformed on a center hub, so that the recording mediumcan respond to both an old system driving unit having a centering member coupling with the center holeand a new system driving unithaving a second centering membercoupling with the center hole. Moreover, the old system recording medium is a recording medium providing a recording disk having a center hole incorporated in a cartridge having a center hub, and has a structure where the center hole is coupled both with a first centering memberof the new system driving unitand with the centering member of the old system driving unit.

Cartridge type recording medium and disk-shaped recording medium including a hole for centering each thereof, cartridge, driving unit and driving method

The object of the present invention is to provide a technology which has high compatibility and can provide users with conveniences. A new system recording mediumhas a center holeformed on a recording diskand a center holeformed on a center hubso that the recording mediumcan respond to both an old system driving unit having a centering member coupling with the center holeand a new system driving unithaving a second centering membercoupling with the center holeMoreover, the old system recording medium is a recording medium providing a recording disk having a center hole incorporated in a cartridge having a center hub, and has a structure where the center hole is coupled both with a first centering memberof the new system driving unitand with the centering member of the old system driving unit.

A magneto-optical recording head comprises a magnetic coil formed on a lower surface of a transparent substrate opposed to a magneto-optical disk. A heat sink layer is provided at the outside of the magnetic coil on the lower surface. An objective lens is supported on an upper surface of the transparent substrate. The heat, which is generated by the magnetic coil, is released via the heat sink layer to the space between the magneto-optical disk and the substrate. The release of the heat is facilitated by the air stream which is generated by the rotation of the magneto-optical disk. The heat can be effectively released from the magnetic coil without inhibiting optical characteristics of the objective lens.

Magneto-optical head having heat sink layer

In a light transmission system for transmitting a light beam with a variation of wavelength from a light source to a light receiver, comprising, an optical element for receiving the light beam and projecting the light beam, and a compensation optical element for receiving the light beam and projecting the light beam, the optical element and the compensation optical element are arranged optically in series between the light source and the light receiver, a deflection angle of the optical element changes in a first direction according to an increase of wavelength of the light beam, a compensating deflection angle of the compensation optical element changes in a second direction according to the increase of wavelength of the light beam, and the change of the deflection angle in the first direction is compensated by the change of the compensating deflection angle in the second direction so that a position on the light receiver at which position the light beam impinges is restrained from changing according to the increase of wavelength of the light beam.

Light transmission device and apparatus including light transmission device

A compact recording and reproducing apparatus includes a floating-type head movable in a fan shape in parallel with the surface of a disk recording medium in order to make faster access to the tracks and to record information at a higher density. A slider and a head are secured to the tip of a swing arm capable of fan-shaped swing movement, and a solid immersion lens is used for the head, so that the light beam can be passed along the arm from the fulcrum at the rotating pivot of the swing arm member.

Recording and reproducing apparatus having a magneto-optical head with an objective lens and laser-beam-permeable member

A magneto-optical recording medium comprises a protective layer having a self-lubricating property formed at an uppermost layer on a side opposite to a substrate wherein a recording or reproducing light beam comes into a side of the protective layer. The thickness and the refractive index of the protective layer are selected under predetermined conditions depending on whether or not evanescent light is transmitted through the protective layer. It is possible to perform high density recording and reproduction thereof by utilizing the evanescent light. A protective layer having a self-lubricating property may be also formed on a bottom surface of an optical head opposing to the optical recording medium. Even when the optical head contacts with the surface of the optical recording medium, the sliding scratch scarcely occurs, because the optical head smoothly glides on the recording medium surface. It is possible to reduce the influence of multiple interference of light which would be otherwise caused in an air layer existing between the optical recording medium and the optical head, and it is possible to suppress variation in reproduced signal intensity.

Optical recording medium with solid protective layer having self-lubricating property

On a surface of a transparent substrate,having a preformat pattern,formed thereon are laminated a first recording layer,in which a recording state exists in one different magnetic field region of an applied external magnetic field and a second recording layer,in which two recording states exist in magnetic field regions different from that for the first recording layer. As required, dielectric layers,and,, a reflecting layer,and a protection layer,can be laminated. The 4-valued recording of information becomes possible by assigning information signals &ldquo;1&rdquo;, &ldquo;0&rdquo;, &ldquo;3&rdquo;, and &ldquo;2&rdquo; to H,, H,, H,and H,, respectively.

Magneto-optical recording medium capable of recording multiple value signals

Optical recording medium and optical recording device

An optomagnetic recording and reproducing system has been developed which demonstrates superior performance when used with multilayer recording substrates. The system features an optical head and magnetic head disposed opposite to each other on different sides of the recording substrate. The novel magnetic head can either incorporate a number of independently driven subheads, or alternately it can be constructed by placing multiple independently driven windings on a single head. Biasing of the magnetic head can either be performed externally using an external magnet or by providing a bias with one of the windings or sub-heads. The resulting optomagnetic recording and reproducing system is suitable for multi-valued recording of an optomagnetic recording medium.

Magnetic head capable of generating multi-stepped external magnetic

Magneto-optical recording medium having a plurality of magnetic layers

Optical recording medium

Recording and reproducing apparatus having a magneto-optical head with

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Tsukuba, Japan

Toshinori Sugiyama