Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Taiichi Mori

Masaharu Fukakusa

Shogo Horinouchi

Takashi Haruguchi

Shin Ishibashi

Hideki Yoshinaka

Nobuyuki Tokubuchi

Hitoshi Asahi

Hideaki Horio

Kazuyuki Nakashima

Shohei Inoue

Mikio Tomisaki

Hiroshi Tanigawa

Seigi Ito

Haruhiko Kono

Syougo Horinouchi

Fuminobu Furukawa

Akira Gyoutoku

Hiroshi Goto

Kouichi Bairin

Tetsuya Araki

A plate body, multiple hologram layersare provided in the thickness direction of the plate body, and at least one of the multiple hologram layersis formed of spirally continuous hologram bands. Erasure areasA andB and non-erasure areasC andD of the hologram bandare provided in the length direction of the hologram band. Non-erasure areasE andF of the hologram bandare formed on both sides in the direction orthogonal to the length direction of the hologram bandin the erasure areasA andB.

Record medium, optical disk unit using it, and recording method

The recording and reproducing apparatus has rotary drive unit (a motor) that rotationally drives a multilayer recordable recording medium; a reference-light-side recording and reproducing lensand a recording-light-side recording and reproducing lensthat are disposed oppositely to the recording mediumwhich is rotationally driven by the rotary drive unit, an address detection lensthat is disposed opposite the recording mediumand that is provided separately from the recording and reproducing lensesand; a light sourcefor recording and reproducing purpose that supplies recording reproduction light to the recording and reproducing lensesand; and the address light sourcethat supplies address light to the address detection lens. The apparatus is configured in such a way that light whose center axis portion is optically hollow is supplied from the reference-light-side recording and reproducing lensto the recording mediumduring reproducing operation.

Recording and reproducing apparatus

Then, in order to achieve the above-described object, in the optical disk of the present invention, while micro-hologram layersandmade of plural layers are provided in an inner portion of a plate bodyalong a thickness direction of the plate body, dimensions of micro-hologramsalong the thickness direction of the plate body, which configure the micro-hologram layerformed on the side of one surface of the plate bodywithin the micro-hologram layersandconstructed of the plural layers, are made smaller than dimensions of micro-hologramsalong the thickness direction of the plate body, which configure a micro-hologram layerformed on the side of an inner layer of the plate body

Optical disk, recording/reproducing method thereof, and optical disk apparatus with employment of optical disk

An optical pickup device includes light sources for respectively emitting a plurality of different wavelengths of light, a unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and a focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part. The optical pickup device and optical disk device are capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser.

Objective lens, optical pick-up device, and optical disk device

To provide an optical pickup device and optical disk device capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where coping with various wavelengths of laser including a blue laser. An optical pickup device comprising light sources for respectively emitting a plurality of different wavelengths of light, unit structured for causing at least a part of the light emitted from the light sources to pass a same optical path; and focusing unit for focusing the light. The focusing unit includes at least first and second focusing parts, the first focusing part being to focus mainly a wavelength of light different from a wavelength of light to be mainly focused by the second focusing part.

An optical recording/reproducing apparatus has a light source that radiates a laser beam, an optical detector that detects reflected light from the optical disc, a collimator lens that converts the radiated light of the light source into a fine divergent pencil of rays, and an objective lens that focuses these rays on the optical disc. The collimator lens has a surface that is curved to form a wavefront shape that increasingly corrects a coma aberration of the radiated light in correspondence to a radial distance between the center of the collimator lens and a position at which the radiated light intersects the collimator lens.

Optical pickup apparatus restricting aberration and optical disc apparatus using the same

In an optical pickup device for recording information onto and/or reading out information from an optical recording medium, comprising a light beam source for generating a light beam to be projected toward the optical recording medium, and a light beam detector for receiving the light beam reflected by the optical recording medium so that the information is read out from the light beam after reflected by the optical recording medium, a container houses therein the light beam source and includes an aperture through which the light beam proceeds toward the optical recording medium, and a light beam guide member is mounted on an outer surface of the container and covers the aperture to guide the light beam after reflected by the optical recording medium toward the light beam detector.

Optical pickup device

An optical pickup device has a single light beam path in which at least one or either of a plurality of kinds of light beams (different from each other in, for example, wavelength) for respective recording densities and/or recording-medium-thicknesses proceeds toward a surface of an optical recording medium and proceeds to a light beam detector after being reflected by the surface.

An optical pickup device has a single light beam path for common use in treating or passing either of a plurality of kinds of light beams for respective recording densities and/or recording-medium-thicknesses different from each other, in other words, at least one or either of the plurality of kinds of light beams is introduced into the common single light beam path which may includes a single quarter-wave plate and/or single collimator and/or single objective.

Optical pickup having a common light beam path for passing either of a plurality of kinds of light beams

An optical pickup includes a light source, a light converging portion for converging a light emitted from the light source on the recording surface of an optical disk, a signal detecting portion for detecting a light reflected by the recording surface and converting this light into a specified electric signal, a first optical element, which is arranged between the light source and the light converging portion for forming a plurality of diffracted lights from the light emitted from the light source, and a second optical element, which is arranged between the light source and the light converging portion and in which an optical path for the light reflected by the recording surface of the optical disk and an optical path for the emitted light are different from each other. Thus, without increasing the weight of a movable portion and also without increasing the manufacturing costs of a condenser lens, reproducing is performed from a high density optical disk and a conventional low density optical disk, which are different in standard.

Optical pickup with a vertically movable aperture means

An optical integration element of the invention comprises a substrate possessing a light emitting element for emitting light, and a receiving sensor for receiving reflected light, an incident part composed of an optical transparent material for receiving the light from the light emitting element, a first reflecting part for reflecting the light entering from the incident part, a second reflecting part for reflecting by converting the light from the first reflecting part into nearly parallel light or convergent light, a condensing part for condensing the light from the second reflecting part, and an optical member forming an optical path transforming part for guiding the reflected light into the receiving sensor.

Optical integrating element and integration type optical pickup device

A thin film type magnetic head comprising a magnetic core made of a metallic magnetic material and interposed between two non-magnetic bases is disclosed. An auxiliary film, made of a magnetic material, is disposed on a surface including the magnetic core and not the surface which comes into contact with a recording medium. This arrangement can reduce the size of the magnetic head while preventing the lowering of the reproduction output.

Growing community of inventors

Fukuoka, Japan

Taiichi Mori