Sharp Kabushiki Kaisha Corporation

Other

Sharp Corporation

Junichiro Nakayama

Kenji Ohta

Akira Takahashi

Hiroyuki Katayama

Junji Hirokane

Michinobu Mieda

Yoshiteru Murakami

Tomoyuki Miyake

Naoyasu Iketani

Junsaku Nakajima

Kazuo Van

Tetsuya Inui

Kazuhiro Kimura

Hideaki Sato

Go Mori

Takeshi Yamaguchi

Toshio Ishikawa

Takashi Iwaki

Shozo Kobayashi

Katsuo Wada

Masanori Seki

Miyuki Onishi

Hiroshi Tsunasawa

Yoshihiro Taniguchi

Kunio Kojima

Hirotsugu Matoba

Takahiro Miyake

Hideyoshi Yamaoka

Satoru Ariyoshi

Hitoshi Isono

Hirotaka Toki

Yoshihiro Yamamoto

Tetsurou Muramatsu

Tomokazu Ise

Masanobu Tanaka

Hiroyuki Ikenaga

Ikumi Kashiwagi

Ichiro Hiramatsu

Tadashi Une

Kensuke Goto

Yoshihiko Minamiyama

Kouji Ohta

The laser beam projection maskhas three rectangular-shaped slitsas transmission areas. These three slitsare formed in sequence in X direction shown by an arrow X in FIG.C at specified intervals, and the width in the X direction decreases in the order of the slit, the slitand the slit. More particularly, transmission coefficients of the transmission areas change in conformity with a temperature distribution curve Vof a silicon filmshown in FIG.B.

Laser beam projection mask, and laser beam machining method and laser beam machine using same

A first laser beam is emitted from a first laser oscillator in a pulsed manner at a high repetition frequency, and converged onto a substrate by a first intermediate optical systemso as to form a slit-like first beam spot. A second laser beam is emitted from a second laser beam oscillator in a pulsed manner to rise precedent to and fall subsequent to the first laser beam, and converged onto the substrate by a second intermediate optical system so as to form a second beam spot similar in configuration to the first beam spot and to contain the first beam spot. Crystallization of a semiconductor thin film on the substrate is carried out while the substrate or the first, second beam spots are moved. Thereby, the whole semiconductor thin film is formed into a crystal surface that has grown in one direction and free from ridges. Thus, the semiconductor thin film has an extremely flat surface, extremely few defects, large crystal grains and high throughput.

Semiconductor thin film crystallization device and semiconductor thin film crystallization method

A plasma information display element of the present invention includes a first substrate; a second substrate opposing the first substrate; a plurality of barrier ribs provided between the first substrate and the second substrate; and a plurality of discharge channels defined by the first substrate, the second substrate and the barrier ribs. The plasma information display element further includes: an anode and a cathode provided on one side of the first substrate that is closer to the second substrate; and a protective layer provided so as to cover the anode and the cathode, wherein the protective layer is a layer that contains (220)-oriented MgO and (200)-oriented MgO.

Plasma information display element and method for producing the same

A liquid crystal data display device has a liquid crystal panel unit, and a backlight unit is further equipped with an illuminometer for measuring ambient illuminance. Panel brightness Bp (cd/m ) is done by using an equation Bp&equals;a&times;1n (I)&plus;b when ambient illuminance is I (1x), wherein 10<a<340, and 50<b<250.

Liquid crystal data display device

Featured is a recording and reproducing method of a magneto-optical recording medium including a recording layer for recording thereon information magneto-optically and a readout layer which has in-plane magnetization at room temperature and where a transition occurs from in-plane magnetization to perpendicular magnetization as temperature raises. The method includes projecting a light beam onto such a magneto-optical recording medium so as to form a perpendicularly magnetized area in the readout layer by duplication of the magnetization of said recording layer to the area. In further embodiments, the recording medium further includes an intermediate layer made of non-magnetic film formed between the readout and recording layers and the readout and recording layers are composed of rare-earth transition metal alloys such as TbFeCo (recoding layer) readout layer, made of GdFeCo (readout layer).

Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium

Featured is a recording and reproducing method for recording and reproducing information on and from a recording medium. The medium includes a base having a property that a light can be transmitted therethrough, a readout layer formed on the base, which has an in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as temperature rises and a recording layer formed on said readout layer for recording thereon information magneto-optically. A groove for guiding a light beam is formed on a readout layer side of the base and a groove width is set substantially equal to a land width formed between grooves. The recording layer on the grooves and the recording layer on lands are used in recording and reproducing information. Further a light beam is incident on a converging lens of an optical head, the light beam having a larger diameter &ohgr; than an aperture &agr; of the converging lens for converging the light beam on a predetermined position of the magneto-optical recording medium.

Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens

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 recording medium is composed of a base which has a property that a light can be transmitted therethrough, a readout layer formed on the base, which has in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as the temperature thereof is raised and a recording layer formed on the readout layer for recording information magneto-optically. A recording and reproducing method and the optical head are designed for the magneto-optical recording medium. By the recording and reproducing method using the optical head, information recorded at high density can be reproduced.

The plasma address information display device of this invention includes a plasma address cell and a display medium layer which is addressed by the plasma address cell, the plasma address cell including: a substrate; a transparent thin substrate opposing to the substrate; a plurality of partitions made of dielectrics formed between the substrate and the transparent thin substrate; and electrodes disposed on a surface of the substrate facing the transparent thin substrate, wherein a mixed gas composed of an inactive gas and an active gas is sealed in plasma discharge spaces each surrounded by the substrate, the transparent thin substrate, and the plurality of partitions.

Plasma display panel having mixed gases to counteract sputtering effects

A plasma addressing display device of the present invention includes: a plasma addressing substrate; a color filter substrate; and a display medium layer interposed between the plasma addressing substrate and the color filter substrate is provided. The plasma addressing substrate includes: a first substrate; a dielectric sheet provided near the display medium layer; a plurality of electrode lines provided at regular intervals on the first substrate; a plurality of partition walls provided respectively on the plurality of electrode lines; and a plurality of strip plasma discharge channels each enclosed by the first substrate, the dielectric sheet and the partition walls. The color filter substrate includes: a second substrate; a color filter layer provided on the second substrate; a plurality of strip electrodes provided on the color filter layer so as to extend in a direction orthogonal to the plurality of strip plasma discharge channels. A picture element is defined by a region where adjacent two of the plasma discharge channels overlap one of the plurality of strip electrodes.

Plasma addressing display device and method for producing the same

An magneto-optical recording medium includes: a transparent dielectric layer; a reproduction layer that is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature; a non-magnetic intermediate layer; a recording layer made of a perpendicularly magnetized film; and a protection layer, the layers being formed one after another in this order. The recording layer is made of a rare-earth and transition metal alloy, and the rare earth metal is composed of more than two kinds of rare-earth-metal elements containing Gd. The information stored in a magnetic recording domain is masked with respect to a part that is in an in-plane magnetization state. Consequently, recording can be performed with a less powerful laser beam, and each recording bit can be reproduced independently to produce high quality signals even if the converged light beam covers a neighboring recording bit within its radius.

Magneto-optical recording medium

Optical recording medium, method for manufacturing the same, and optical

A magneto-optical memory medium is provided, on a substrate, with a first magnetic layer, which shows in-plane magnetization at room temperature and perpendicular magnetization above a certain temperature, and a second magnetic layer, which shows perpendicular magnetization within a range from room temperature up to its Curie temperature. The first magnetic layer is made up of alternating films of rare earth metals and transition metals. As a result, a magneto-optical memory medium can be provided which has a wide reproducing power margin, and which is able to prevent deterioration of characteristics due to repeated laser projection.

Magneto-optical memory medium

A magneto-optic memory medium comprising a dielectric film, a magneto-optic memory film, a dielectric film and a reflective film superposed in layers on a light trnasmitting substrate, the magneto-optic memory film being a rare earth-transition metal alloy film having the composition formula of:

Magneto-optic memory medium

An optical disk substrate in which a winding groove, which is winding in accordance with address information, and a normal groove, which is not winding, are placed alternately in the radial direction as tracking guides used for tracking control. With respect to this optical disk substrate, a laser beam, which is used for forming patterns for the tracking guides, is applied while being switched alternately between the first mode that exerts oscillations in the disk radial direction in accordance with the address information and the second mode that does not exert oscillations. An optical disk has a construction in which at least a recording layer is formed on the optical disk substrate.

Optical disk with tracking guide of wind and unwind portions

Growing community of inventors

Shiki-gun, Japan

Junichiro Nakayama