Hitachi, Ltd.

Hitachi Media Electronics Co., Ltd.

Hitachi-lg Data Storage, Inc.

Other

Hitachi Computer Peripherals Co., Ltd.

Toshimasa Kamisada

Yoshiro Konishi

Yasuo Kitada

Tomoto Kawamura

Kazuyoshi Yamazaki

Hiromitsu Mori

Atsushi Inoue

Shigeru Nakamura

Takeshi Shimano

Kyuichiro Nagai

Akira Saito

Ryuichiro Mizuno

Katsuhiko Izumi

Naoya Matsuura

Takeshi Maeda

Motoyasu Terao

Motoyuki Suzuki

Tohru Sasaki

Hisataka Sugiyama

Toshimitsu Kaku

Kazuo Shigematsu

Yoshito Tsunoda

Naoki Mori

Shinichi Nakatsuka

Masayuki Fukui

Kozo Masuda

Masateru Watanabe

Susumu Tachibana

Kazuhiro Soga

Hitoshi Ishii

Yoshiaki Ogino

Masaaki Hishiki

Tuyoshi Kato

A distance measurement image pickup apparatus has two measurement periods. In a first distance measurement period, short pulsed light (1T) is irradiated, and exposure is performed in a plurality of exposure periods (A, B, and C) in which exposure timings are shifted. In each exposure period, an exposure gate is opened a plurality of times to perform repetitive exposure, and a first non-exposure period is provided from when a last exposure gate is closed until subsequent pulsed light is irradiated. In a second distance measurement period, long pulsed light (4T) is irradiated, and exposure is performed in a plurality of exposure periods (A, B, and C) in which exposure timings are shifted. In each exposure period, exposure is performed by opening the exposure gate only once, and a second non-exposure period is provided from when a last exposure gate is closed until subsequent pulsed light is irradiated.

Distance measurement image pickup apparatus

A distance measurement apparatusincludes a light emitting unitthat irradiates a subject with a light-source light from a light source, a light receiving unitthat receives a reflected light from the subject, a distance calculation unitthat calculates a distance to the subject based on a time difference from the irradiation of the light-source light to the reception of the reflected light; and an image processing unitthat generates a distance image of the subject based on the calculated distance. Further, the apparatus includes a first rotation mechanismthat adjusts an irradiation angle of the light emitting unit and a second rotation mechanismthat adjusts a light receiving angle of the light receiving unit, in which the angles of the light emitting unit and the light receiving unit may be adjusted independently of each other.

Distance measurement apparatus and angle adjustment method of the same

A three-dimensional distance measurement apparatus include: a plurality of light sourcesthat irradiate light onto the subject; a light emission control unitthat controls light emission from a plurality of light sources; a light-receiving unitthat detects reflection light from the subject; a distance-calculating unitthat calculates a distance to the subject on the basis of a transmission time of reflection light; and an image processing unitthat creates a distance image of the subject on the basis of calculated distance data. The plurality of irradiation areasonto which light from the light sources are irradiated are arranged to partially overlap only with the neighboring ones. The light emission control unitindividually turns on or off the light sourcesor individually adjusts the emitted light amounts.

Three-dimensional distance measurement apparatus

An optical pickup includes a first source which emits a first beam with a first wavelength; a second source which emits a second beam with a wavelength shorter than the first wavelength; a first collimate lens which collimates the first beam; a second collimate lens which collimates the second beam; a first objective lens which converges the first collimated beam onto an optical disc; and a second objective lens which converges the second collimated beam onto the disc. The first and second objective lenses are arranged in the disc radial direction. The second objective lens is arranged closer to the side of the disc outer circumference than the first objective lens. The first collimate lens is arranged on the right-hand side when the second objective lens is viewed from the first objective lens. The second collimate lens is arranged on the left-hand side when the first objective lens is viewed from the second objective lens. The gap between the first collimate lens and the first objective lens is larger than the gap between the second collimate lens and the second objective lens.

Optical pickup having radially arranged lenses in a low profile construction

An optical pickup equipped with a laser light source which emits light beams of at least three wavelengths for recording/reproducing a plurality of information recording media detects light quantities of the light beams of three wavelengths using one light intensity monitor element. More specifically, one light intensity monitor element is arranged between a first laser light source and a second laser light source, light beams of wavelength &#x3bb;and wavelength &#x3bb;emitted from the first laser light source are made to proceed substantially straightforward, the optical path of the light beam of wavelength &#x3bb;emitted from the second laser light source is changed to a diagonal one so as to cause the light beam to be introduced diagonally to the light receiving surface of the one light intensity monitor element. Furthermore, the central axis line of the light receiving surface of the one light intensity monitor element is separated from the emitted light axis of the first laser light source and a reflecting member is provided above the emitting light axis of the second laser light source.

Optical pickup and optical information recording and reproducing device

An optical pickup apparatus is provided with a dividing element having a plurality of regions. The dividing element is capable of dividing a light flux reflected by the optical disc into a plurality of light fluxes having different outgoing directions. Each region of the dividing element and light receiving parts of a light detector are structured such that when a target information recording layer of the optical disc is brought into focus, a light flux reflected from the target information recording layer is focused on the light receiving parts of the light detector, and a light flux reflected from other information recording layer than the target information recording layer is not irradiated onto the light receiving parts of the light detector.

Optical pickup apparatus and optical disc apparatus with a single beam system

An optical pickup apparatus includes a semiconductor laser for emitting a laser light, an objective lens for irradiating the light flux emitted from the semiconductor laser onto an optical disc, and a light detector for receiving the light flux reflected from the optical disc. The light detector has a light receiving part that comprises five regions of a region, a region, a region, a regionand a region

Optical pick up apparatus with a single beam system and having a diffraction grating

An optical pickup apparatus includes a semiconductor laser for emitting a laser light, an objective lens for irradiating the light flux emitted from the semiconductor laser onto an optical disc, and a light detector for receiving the light flux reflected from the optical disc. The light detector has a light receiving part that comprises a region, a region, a region, a region, a region, a regionand a region

An optical pickup includes a first source which emits a first beam with a first wavelength; a second source which emits a second beam with a wavelength shorter than the first wavelength; a first collimates lens which collimates the first beam; a second collimate lens which collimates the second beam; a first objective lens which converges the first collimated beam onto an optical disc; and a second objective lens which converges the second collimated beam onto the disc. The first and second objective lenses are arranged in the disc radial direction. The second objective lens is arranged closer to the side of the disc outer circumference than the first objective lens. The first collimate lens is arranged on the right-hand side when the second objective lens is viewed from the first objective lens. The second collimate lens is arranged on the left-hand side when the first objective lens is viewed from the second objective lens. The gap between the first collimate lens and the first objective lens is larger than the gap between the second collimate lens and the second objective lens.

Optical pickup apparatus and optical disc apparatus using same

To achieve stable, high capacity, high speed recording. Of two light beams emitted from a light irradiation means, one or two beams are made pass through an optical path changeable member whereof at least one of the thickness and refractive index changes continuously or in two or more steps immediately after emission from the light irradiation means, so that a difference is introduced into the optical path length of the two beams, and the focusing point of one beam is made to vary to coincide with a position in the recording layer used for playback or recording. Another light beam is used for servo. Converging of light during recording or read of a multilayer recording medium is performed with higher precision than in the prior art, so higher density, higher capacity recording/playback can be performed.

Information recording apparatus, information recording medium and information recording medium

The invention provides an optical disc apparatus which restricts an operation sound generated from an objective lens driving portion of an optical pickup and has a reduce sound, in an optical disc apparatus, in particular, an optical disc apparatus installing a microphone for recording an external voice therein. Coils (), a magnet () and opposing surfaces of a yoke () are respectively arranged at substantially point symmetrical positions with respect to an optical axis () of an objective lens () in a state in which no electric current is applied, the yoke () and a unit base () are connected via a spring member (), and the unit base () is mounted to a casing (). In this case, the spring member () is connected at a position () forward apart from the objective lens () with respect to the yoke (), and is formed so as to have at least a deformation freedom in a direction of the optical axis of the objective lens (). The casing () is made in a closed structure surrounding a space in which the unit base (), a lens holder (), the yoke () and the magnet () are arranged, except a surface opposing to a disc-like recording medium ().

Optical pickup and optical disc apparatus provided with the same

An optical disk apparatus includes a motor to rotate an optical disk and an optical head to apply light to the optical disk. The optical head includes a light source to emit the light to be applied to the optical disk, and a collimating lens to receive and collimate the light emitted by the light source. The collimating lens has an optical axis. The optical head also includes a support wall to support the collimating lens at a particular position. The support wall is configured to provide a gap between the collimating lens and the support wall to enable the collimating lens to be adjusted from an initial position to the particular position. The adjustment involves at least a movement in a direction that is perpendicular to the optical axis of the collimating lens. The optical head further includes an objective lens that is configured to receive the light from the collimating lens in order to apply the light to the optical disk.

Optical head and its adjusting method and optical disk device using the same

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Yokohama, Japan

Toshimasa Kamisada