Canon Kabushiki Kaisha

Eiichi Fujii

Yoichi Osato

Hisaaki Kawade

Tadashi Kobayashi

Nobuhiro Kasama

Ichiro Saito

Naoki Nishimura

Kozo Arao

Tsutomu Shiratori

Masakuni Yamamoto

Norio Hashimoto

Yasuyuki Tamura

Minoru Yoshii

Yoshio Takasu

Koichiro Nishikawa

Yasuyuki Miyaoka

Katsuhiko Takano

Morimi Hashimoto

Yukihiro Inoue

Takayuki Aizawa

Masaharu Tsukada

Hiroshi Omata

Shigeharu Iijima

Tohru Tatsuno

Eizou Sasamori

To acquire information on sections of an object with high accuracy even if the area to be imaged with a single scan is wide. A scanning unit is configured such that an angle of linear scanning of a fundus with illuminating light is 47 degrees or greater in the air. A light-source unit 10 includes a MEMS-VCSEL 601 whose coherence length during the sweeping of the frequency of the light is 14 or longer.

Imaging apparatus

An OCT apparatus includes, in addition to a first light source that changes a wavelength of light that is emitted, a second light source that emits light having a particular wavelength. The OCT apparatus is formed so that, when light having the particular wavelength is emitted from the first light source, the light emitted from the second light source is detected by a second optical detector.

Optical coherence tomography apparatus and method

Provided is a product including a group of a plurality of wires, in which longitudinal directions of the wires are arranged in one direction, and a method of producing the same. The longitudinal directions of a plurality of wires each covered with a polymer are arranged in one direction in a solvent, and the plurality of the wires whose longitudinal directions are arranged in one direction is fixed by using the polymer.

Method of producing product including silicon wires

Magneto-optical reproducing apparatus

Disclosed herein is an information recording-reproducing method, wherein a domain wall is displaced on a recording medium in which information has been recorded, thereby conducting the reproduction of the information, the method comprising, projecting a light spot on the recording medium, relatively moving the light spot and the recording medium, applying a magnetic field modulated according to the information to the site projected by the light spot to form record marks the maximum mark length of which is at most 0.15 times the spot size of the light spot and displacing the domain wall from the front to the back of the moving direction of the light spot by a temperature distribution formed on the recording medium by the light spot, and at the same time detecting the displacement of the domain wall from reflected light of the light spot, thereby detecting the record marks.

Information recording-reproducing method utilizing domain wall displacement, and magneto optical medium

A magnetooptical recording medium provided with a first magnetic layer and a second magnetic layer having a higher Curie point and a lower coercive force than the first magnetic layer and being exchange coupled with the first magnetic layer satisfies the relation: ##EQU1## wherein H.sub.H is the coercive force of the first magnetic layer; H.sub.L is the coercive force of the second magnetic layer; M.sub.s is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and .sigma..sub.w is the magnetic wall energy between the first and second magnetic layers.

Magnetooptical recording medium allowing overwriting with two or more

A method and apparatus for reproducing information on a magneto-optical recording medium can reproduce a signal having a period equal to or smaller than the diffraction limit of light at high speed, can obtain a reproduced signal with a high C/N ratio from a small recorded domain at an amplitude nearly equal to that of a large recorded domain, can greatly improve the recording density and transfer rate, and can also make the reproduction apparatus compact. The information reproduction method includes the steps of irradiating a laser beam onto a medium and forming a temperature distribution having at least two peaks by the laser beam. The apparatus has a laser light source and an optical system for irradiating a laser beam emitted by the light source onto the medium, wherein the laser beam forms the temperature distribution having at least two peaks.

Laser beam forming temperature distribution of two peaks on a

An information reproducing apparatus for reproducing information by moving a magnetic wall along an information track on a recording medium. The apparatus includes an optical system for irradiating the recording medium with a light spot of an oval shape having a longer axis and a shorter axis, of which the longer axis is substantially parallel to the information track and a ratio of the longer axis to the shorter axis is at least 1.4, and a movement device for performing relative movement between the light spot and the recording medium.

Information reproducing apparatus for reproducing information by

A magneto-optical recording medium includes a first magnetic layer of which the magnetic wall moves and which contributes to reproduction, a third magnetic layer in which information is accumulated, and a second magnetic layer disposed between the first and third magnetic layers and having a lower Curie temperature than those of the first and third magnetic layers. The following is satisfied at the lowest temperature Ts whereat the exchange-coupling between the first and third magnetic layers is cut:

Magneto-optical medium for reproducing information by the utilization of

An optical recording medium including a substrate formed with a groove portion and a land portion, and a magnetic layer laminated on the substrate, the width of the land portion and the width of the groove portion differing from each other. In the recording medium, the land portion of the recording medium is divided into a plurality of information tracks, and the recording of the information is independently effected on the respective information tracks. In reproduction of information from the recording medium by the use of a super-resolving technique, the reproduction of the information is independently effected from the respective information tracks.

Information recording and reproducing method for recording information

A method of producing a magneto-optical recording medium provided with a reproducing layer on a recording film on a substrate, the reproducing film being in-plane magnetized at room temperature and perpendicularly magnetized at an elevated temperature, and the recording film being perpendicularly magnetized at temperatures between room temperature and its Curie temperature. The method includes the steps of forming the reproducing layer on the substrate while applying a magnetic field in a direction parallel to the film surface of the reproducing film which is being formed, and forming the recording film on the reproducing film.

Magnetooptical recording medium, method for producing the same, method

A method of recording and reproducing information on a magnetooptical recording medium includes the steps of irradiating the medium with laser light to heat a reproducing layer at least to a predetermined temperature at which the layer is vertically magnetizable, thereby rendering the reproducing layer vertically magnetizable and causing it to effect exchange coupling with a recording layer. The method also includes the step of applying a vertical external magnetic field to a portion of the medium irradiated with the laser light and applying a horizontal external magnetic field, weaker than the vertical external magnetic field, during recording and reproducing of data.

Magneto-optical reproducing method using a reproducing layer of

A magnetooptical recording medium for information recording and information reproduction includes plural thin films, including at least a reproducing layer and a recording layer, laminated on a substrate. The reproducing layer is composed of a magnetic thin film which assumes a horizontally magnetized state at room temperature but assumes a vertically magnetized state above a predetermined temperature higher than the room temperature. The magnetization in the horizontally magnetized state is free from vertical orientation, including the magnetic wall. The recording layer is composed of a magnetic thin film which assumes a vertically magnetized state at room temperature and above the predetermined temperature.

In a magnetooptical recording apparatus, a magnetic field modulated in accordance with an input signal is applied to a portion of a recording medium onto which a light beam is irradiated. The magnetooptical recording apparatus includes a device for applying a magnetic field for canceling a self leakage magnetic field applied from a portion having a magnetization other than the light beam irradiated portion of the medium, and a leakage magnetic field leaking from a member other than the medium.

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Yokohama, Japan

Eiichi Fujii