Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Kousei Sano

Shin-ichi Kadowaki

Yoshiaki Komma

Hidenori Wada

Fumitomo Yamasaki

Kanji Wakabayashi

Toshiyasu Tanaka

Hiroaki Yamamoto

Keiichi Matsuzaki

Seiji Nishino

Akihiro Arai

Katsuhiko Yasuda

Akihiro Yasuda

Ken'ichi Kasazumi

Tomotada Kamei

Yasumori Hino

Hideki Aikoh

Joji Anzai

Sadao Mizuno

Yuuichi Kuze

Shinichi Tanaka

Daisuke Ogata

Eishin Mori

Seiji Nishiwaki

Hideki Nakata

Tatsuya Takaoka

Takayuki Nagata

Katsuya Watanabe

Kenji Fujiune

Takashi Kishimoto

Hideki Hayashi

Shin-ichi Yamada

Masahito Nakao

Shigeru Furumiya

Hiromichi Ishibashi

Katsuhiko Hayashi

Kazuo Momoo

Teruhiro Shiono

Takeharu Yamamoto

Shin-ichi Tanaka

Takeshi Shimamoto

Keisuke Fujimoto

Junichi Asada

Yuichi Takahashi

Takashi Haruguchi

Osamu Kajino

Yasushi Kobayashi

Hirotaka Ueno

Tomoaki Tojo

Jouji Anzai

Makoto Takashima

Kenichi Shinotani

Ikuo Ohmura

Hajime Hatada

The first, third, fourth, and seventh photosensors are disposed on one side with respect to the centerline, and the second, fifth, sixth, and eighth photosensors are disposed on another side with respect to the centerline. The first and seventh photosensors are positioned between the third and fourth photosensors in the direction parallel to the centerline. The second and eighth photosensors are positioned between the fifth and sixth photosensors in the direction parallel to the centerline. The first photosensor receives overlapped light of the 0th-order light with the +1st-order diffracted light, the second photosensor receives overlapped light of the 0th-order light with the &#x2212;1st-order diffracted light, each of the third to sixth photosensors receives the 0th-order light, and does not receive the +1st-order diffracted light and the &#x2212;1st-order diffracted light, and each of the seventh and eighth photosensors receives at least the 0th-order light.

Recorder and player apparatus stably keeping track of recording medium

A recording device of the present disclosure includes a light source, an objective lens, a beam splitter, an optical element, a detector and an operation circuit. The optical element divides a light beam into a first main region, a second main region, a first main end region, a second main end region, a first sub-region, and a second sub-region. The operation circuit generates a main signal in which a first main end region signal is multiplied by a coefficient a and added to the first main region signal, and a second main signal in which a second main end region signal is multiplied by the coefficient &#x3b1; and added to the second main region signal.

Recording apparatus

An optical disc information device is an optical disc information device for reproducing and/or recording information with respect to an optical disc including a track in the form of a groove, and capable of recording information in a land portion and in a groove portion of the groove. The optical disc information device includes a laser light source, an objective lens, a transmittance limiting element, a dividing element, a light detector, a central amplifier, at least two end amplifiers, a gain controller, an adder, a reproduction signal processor, and a control signal processor. The transmittance limiting element includes a first central region, and at least two first end regions which interpose the first central region therebetween, and attenuates light passing through at least the first end regions out of a light flux emitted from the laser light source more strongly than light passing through the first central region.

Optical disc information device and information processing device

An RF hologram is divided in a direction perpendicular to a tangent line of an information track of an information recording surface of an optical disc, and includes a central region including an optical axis of laser light as well as a first end portion region and a second end portion region which sandwich the central region, the central region is formed by a binary diffraction grating and generates &#xb1;1 order diffracted light, the first end portion region is formed by a blazed diffraction grating and generates first +1 order diffracted light, the second end portion region is formed by a blazed diffraction grating and generates second +1 order diffracted light, and an RF light receiving element receives both the &#xb1;1 order diffracted light, the first +1 order diffracted light, and the second +1 order diffracted light.

Optical information apparatus and information processing apparatus

The present application discloses optical disc apparatus including: drive mechanism for rotating medium including processing surface to be subjected optical information process; housing for storing drive mechanism; tray mechanism for displacing medium between storage position, at which medium is stored in housing, and ejection position, at which medium is ejected from housing; at least one objective lens for condensing light onto processing surface of medium situated at storage position to perform information process; and first displacement mechanism for displacing at least one objective lens along processing surface between first position and second position which is more distant from rotational center of medium rotated by the drive mechanism than first position is. Tray mechanism defines at least one opening in position closer to second position than first position.

Optical disc apparatus, sheet member, and method for cleaning objective lens

An optical disk information device includes a laser light source that emits a luminous flux with a wavelength &#x3bb;, an objective lens having a numerical aperture NA, a splitting element, a photodetector, a central portion amplifier, at least two end portion amplifiers, an adder, a control signal processing section having a tracking switcher that inverts a polarity of a tracking control signal depending on whether a track scanned by a condensing spot corresponds to a land portion or a groove portion, and a gain controller that, when the polarity of the tracking control signal is inverted, switches gains of the central portion amplifier and the end portion amplifiers and sets the gain of the central portion amplifier substantially lower than the gain of at least one of the end portion amplifiers so as to reduce crosstalk from adjacent tracks in the optical disk.

Optical disk information device and information processing device

The present application discloses a detection device including a light source configured to emit emission light, a scattering substance situated near a target object and configured to generate plasmon resonance between the scattering substance and the target object, a light guide portion configured to guide the emission light to the scattering substance and cause first reflected light, which is reflected from the scattering substance, and a detector configured to detect a state in phase of the first reflected light.

Detection device, information reproduction device, drive device, sensor, and detection method

A ratio Xm of an information item recorded on an adjacent track relative to an information item recorded on a main track included in a first signal obtained from a first light flux having passed through a center region () is different from ratios Xs1 and Xs2 of the information items recorded on the adjacent track relative to the information items recorded on the main track included in second and third signals obtained from second and third light fluxes having passed through first and second end regions (), and a ratio of respective gains of a first waveform equalizer (), a second waveform equalizer (), and a third waveform equalizer () is determined so as to cancel the information item recorded on the adjacent track in each of frequency components of the first signal, the second signal, and the third signal.

Optical information device, cross-talk reduction method, computer, player, and recorder

A light modulator () includes a waveguide () through which guided light propagates, a metal layer () formed adjacent to the waveguide (), a conductive oxide layer () having electrical conductivity and formed on a surface of the metal layer () which is not adjacent to the waveguide (), an insulating layer () formed adjacent to the conductive oxide layer (), and a modulation circuit () that applies a voltage between the metal layer () and one of the conductive oxide layer () and the insulating layer (). An interface () at which the conductive oxide layer () and the insulating layer () are adjacent to each other is formed at a distance shorter than a wavelength of the guided light in vacuum, from the surface of the metal layer () which is not adjacent to the waveguide ().

Light modulator, optical pickup, and light modulation module

An optical information device is provided with a first scattering medium (), a second scattering medium (), a third scattering medium (); a diffraction element () which generates a plurality of light beams; an objective lens () which guides, to the first scattering medium () and to the third scattering medium () out of the first scattering medium (), the second scattering medium (), and the third scattering medium (), two light beams out of the plurality of the light beams; and an arithmetic circuit () which detects a gap interval between the first scattering medium () and the third scattering medium (), and an information medium (), based on a change in an amount of reflected light from the first scattering medium () and from the third scattering medium ().

Optical information device, optical disc driving device, optical information recording device, optical information reproducing device, gap control method, and optical pickup

An optical disc () has a first mark () disposed at the center of a track, a second mark () disposed away from the center of the track in a tracking direction thereof by a distance b, and disposed away from the first mark () in the direction along the track by a distance L, and a third mark () disposed away from the center of the track in the tracking direction opposite to that of the second mark () by a distance b, and disposed away from the first mark () in the direction along the track by a distance L. The second and third marks () and () generate scattered light depending on the distance between a scattering medium () and each of the marks by irradiating the scattering medium () in an optical information apparatus with light. The distances band bare smaller than 50 nm.

Information recording medium, tracking method, and optical information apparatus

An objective lens unit according to the present invention includes a first objective lens; and a first lens holderfor supporting the first objective lens. The first lens holderis formed of a material which transmits ultraviolet. Preferably, the first lens holderincludes a through-hole, having first and second openingsand, through which light incident on the first objective lenspasses, and an opening limiting sectionprovided along a circumferential direction of the through-hole and projecting toward a central axis of the through-hole. The first objective lensis supported so as to block the first opening. The opening limiting sectionguides light incident thereon from the second openingin a direction away from an optical axis of the first objective lens.

Objective lens unit, optical pickup, and optical information apparatus

An optical head device includes a light blocking region disposed on a light flux of a reflected light beam resulting from reflection by a recording layer on which a blue light beam is focused, and blocks, when there are at least two recording layers on a blue light beam incident side of the recording layer on which the blue light beam is focused or on a side thereof opposite to the blue light beam incident side, reflected light beams resulting from reflection by the at least two recording layers which are incident on a region in a photodetector where the reflected light beams resulting from the reflection by the at least two recording layers interfere with each other. The light blocking region is not formed on an optical axis of the reflected light beam resulting from the reflection by the recording layer on which the blue light beam is focused.

Optical head device, optical information device and information processing device

An optical pickup, an inclination angle detection method, an optical information device, and an information processing device capable of reliably and accurately detecting a relative inclination angle between an end face of a solid immersion lens and a surface of an optical recording medium are provided. A convergence position modifying unit modifies convergence states of a first beam and a second beam according to layers of an optical recording medium, a first optical detector includes a first light receiving section which receives the converged first beam and a second light receiving section which receives the converged second beam, and the first optical detector detects a relative inclination angle between an end face of a solid immersion lens and a surface of the optical recording medium based on a difference in quantities of received light between the first light receiving section and the second light receiving section.

Optical pickup, inclination angle detection method, optical information device and information processing device

An optical pickup, an optical disk drive device, an optical information recording device, and an optical information reproduction device in which a reproduction signal, a focus error signal, and a gap error signal can be detected with high accuracy when information is recorded/reproduced on/from an optical information medium having a plurality of information recording layers.

Optical pickup, optical disk drive device, optical information recording device, and optical information reproduction device

Growing community of inventors

Osaka, Japan

Kousei Sano