Hitachi Maxell, Limited

Maxell, Ltd.

Mitsubishi Kagaku Media Co., Ltd.

Hitachi Maxwell, Ltd.

Osamu Ishizaki

Tsuyoshi Maro

Hiroyasu Otsubo

Katsusuke Shimazaki

Toshinori Sugiyama

Masafumi Yoshihiro

Hideo Daimon

Tatsuo Araki

Norio Ohta

Osamu Kawamae

Chiyo Ohno

Akito Sakemoto

Satoru Ohnuki

Hiroyuki Hirata

Takeshi Ohnuki

Kazuko Ishitsuka

Hiroyuki Awano

Minoru Fujita

Susumu Imai

Kazuyoshi Adachi

Makoto Aihara

Yasuhiko Kokufuda

Reiji Tamura

Naoki Kitagaki

Shigeo Fujitani

Satoshi Yamagata

Susumu Shibasaki

Norio Ota

Jun Kanehira

Hiroyuki Ohta

Provided is an imaging system capable of stereo-photographing with both of visible and infrared images, and improving color reproducibility in visible-light-photographing. The imaging system includes two imaging sensors, and two DBPFs that have transmittance characteristics in a visible light band and a second wavelength band, are respectively provided correspondingly to the two imaging sensors, and serve as optical filters. The imaging system has: at least four kinds of filters, which have mutual different spectral transmission characteristics corresponding to wavelengths in the visible light band and whose transmissions in a second wavelength band approximate each other; and two color filters provided so as respectively correspond to the two imaging sensors. The imaging system measures a distance to a target based on two visible or infrared image signals.

Imaging apparatus and imaging system

Provided is an imaging system capable of stereo-photographing with both of visible and infrared images, and improving color reproducibility in visible-light-photographing. The imaging system includes two imaging sensors, and two DBPFsthat have transmittance characteristics in a visible light band and a second wavelength band, are respectively provided correspondingly to the two imaging sensors, and serve as optical filters. The imaging system has: at least four kinds of filters, which have mutual different spectral transmission characteristics corresponding to wavelengths in the visible light band and whose transmissions in a second wavelength band approximate each other; and two color filters provided so as respectively correspond to the two imaging sensors. The imaging system measures a distance to a target based on two visible or infrared image signals.

An imaging sensor includes a color filter, and DBPF that has a transmission characteristic in a visible-light band, a blocking characteristic in a first wavelength band adjacent to a long-wavelength side of the visible-light band, and a transmission characteristic in a second wavelength band that is a part of the first wavelength band. A transmission characteristic of DBPF and a transmission characteristic of each filter part of the color filter are set in such a manner that the second wavelength band of DBPF is included in a third wavelength band that is a wavelength band in which transmittance of the filter parts in colors is approximate to each other on a long-wavelength side of the visible-light band and a fourth wavelength band that is a wavelength band in which a filter part for infrared light has a transmission characteristic.

Imaging sensor and imaging device

An imaging processing device and an imaging processing method that can solve a problem generated in visible light photographing in a case where DBPF is used instead of an infrared cut filter. An imaging sensor includes a color filter, and DBPH that has a transmission characteristic in a visible-light band, blocking characteristic in a first wavelength band adjacent to a long-wavelength side of the visible-light band, and transmission characteristic in a second wavelength band that is a part of the first wavelength band. A signal processing unit subtracts an infrared signal, which is output from an infrared pixel, from each color signal output from a pixel in each color of visible light in the imaging sensor. Here, in a case where each color signal reaches a pixel saturation level, control of performing correction in such a manner that an infrared signal subtracted from each color signal is lowered is performed.

Imaging processing device and imaging processing method

An optical recording medium includes a plane ring-shaped substrate in which a center hole is opened at the center thereof, a recording-retrieving function layer and a cover layer each having an outer diameter approximately equal to that of the substrate and an inner diameter larger than an outer diameter of the center hole, are stacked on the substrate, and as a separate entity from the cover layer, a clamp portion which is for holding and fixing the substrate and which has an outer diameter smaller than inner diameters of the recording-retrieving function layer and the cover layer, is provided around the center hole in a region where the cover layer is not formed.

Optical recording medium

In an apparatus for recording and reproducing a thin optical disc by using the same optical system as that of a CD, a DVD or the like, the invention provides a technique which can stably rotate the thin optical disc at a high speed. The structure can be made such that a turbulence of an airflow is not generated even if the thin optical disc on a turn table is rotated at a high speed, by employing a transparent turn table and arranging a recording and reproducing head or the like in an opposite side to a thin optical disc mounting surface of the turn table.

Recording and reproducing apparatus of thin optical disc

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

An information recording medium has such error detecting codes that the distance between the codes of adjacent tracks of the medium is always 1. The bits E -E of the detecting codes, which are included by pre-format information, are generated as data trains of parity check bits constructed by dividing the bits S -S of the sector numbers and the bits T -T of the track numbers. If the generated detecting codes are compared between adjacent, tracks, the distance between the codes is always 1. Consequently, when the detecting codes of a desired track are read out, substantially no cross talk occurs from the detecting codes of the adjacent tracks. Therefore, even if the recording medium has a narrow track pitch, it is possible to reliably and accurately detect the errors of address data of the medium.

Information recording medium and error detecting method

There is provided a disk cartridge adaptable to an enlarged head by exposing an information recording disk extensively out of a cartridge case. In the disk cartridge, a cartridge case is divided on its plane into at least a first case portion and a second case portion, and the second case portion is arranged to be slidable relative to the first case portion. When the disk cartridge is not in use, the information recording disk is enabled to be covered by the first case portion and the second case portion by keeping the first case portion and the second case portion in a parallel state, and a disk freeing portion is so formed that, when the disk cartridge is in use, exposes parts of both inside face and outside face of the information recording disk are exposed from the cartridge case by moving the second case portion relative to the first case portion and overlapping the first case portion and the second case portion.

Disk cartridge

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, on a substrate, a reflective layer, a first dielectric layer, a recording layer, and a second dielectric layer successively in this order, for being irradiated with a recording or reproducing light beam coming from a side of the second dielectric layer. A diamond-like carbon layer as a self-lubricating layer is formed on the second dielectric layer. An optical head comprises a floating type slider installed with a solid immersion lens. A protective film having a self-lubricating property may be also formed on a bottom surface of the slider opposing to the optical recording medium. Even when the floating position of the optical head is varied, and the optical head contacts with the surface of the optical recording medium, then the sliding scratch scarcely occurs, because the optical head smoothly glides on the recording medium surface. A lubricating layer may be further formed on the self-lubricating layer.

Optical recording medium, optical head, and optical recording device

A cavity surface-forming plate of a mold for injection-molding a plastic substrate is coarsely polished, and then a surface for defining a cavity is applied with electroless Ni&mdash;P plating. The surface of the plating is polished with abrasive grains to obtain surface roughness of Ra&lE;2.0 nm and Rmax&lE;22 nm. The plastic substrate molded with the mold has smoothness equivalent to the polished plating surface. A concave-convex pattern for forming pits may be formed on the cavity surface. A magnetic disk or an optical disk provided with the substrate makes it possible to realize the near contact system for a magnetic or magneto-optical head. Thus, it is possible to realize high density recording.

Substrate for information recording disk, mold and stamper for injection molding substrate, and method for making stamper, and information recording disk

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Makabe-gun, Japan

Osamu Ishizaki