Konica Minolta Opto, Inc.

Nec Corporation

Konica Corporation

Konica-minolta Holdings, Inc.

Pioneer Corporation

Mitsubishi Denki Kabushiki Kaisha

Koninklijke Philips Corporation N.v.

Massachusetts Institute of Technology

Polymatech Co., Ltd.

Nec Engineering, Ltd.

Tohru Kimura

Yuichi Atarashi

Nobuyoshi Mori

Eiji Nomura

Kohei Ota

Kiyono Ikenaka

Yoshiharu Aimoto

Junji Hashimura

Kiyoshi Yamashita

Katsuya Sakamoto

Yoshikazu Yabe

Kenji Ogiwara

Hiroki Koike

Toshiyuki Kojima

Kazutaka Noguchi

Hiroshi Hirayama

Koichi Takeda

Dai Nakajima

Norikazu Arai

Hitoshi Yano

Kentarou Nakamura

Bernardus H W Hendriks

Koji Fukami

Charles G Sodini

Mitsuru Mimori

Nobuhide Yoshida

Takemi Miyazaki

Shogo Yamamoto

Jun Noda

Katsuya Yagi

Yuuichi Aoki

Akitake Mitsuhashi

Daigo Taguchi

Yuuji Kuramoto

Masahide Takada

Teruki Sukenari

Tetsuya Otsuki

Kunihiro Suzuki

It is an object of the present invention to provide a wireless transmitting/receiving method for achieving both a high-speed data transfer and a power-saving operation by using wireless transmitting/receiving apparatus adaptable to a ubiquitous system, whereby a wireless transmitting/receiving method which performs wireless transmission/reception using no less than two carrier waves which belong to a different frequency band is used to transmit/receive a control signal for controlling the transmission/reception operation of the wireless transmitting/receiving apparatus by using a carrier wave which belongs to a lower frequency band (400 MHz band), and to transfer data by using a carrier wave which belongs to a higher frequency band (2.4 GHz band).

Wireless transmitting/receiving method and wireless transmitting/receiving apparatus

A communication network of the present invention includes: a plurality of superordinate nodestoforming a cascade type topology; and a plurality of terminal nodesto, connected to at least one superordinate node from among said plurality of superordinate nodes and forming a star type topology with the superordinate node connected.

Communication network, information processor and address assigning method

There are provided an optical pickup device which can satisfactorily record and/or reproduce information on different kinds of optical information recording medium in spite of compactness, and an objective optical element used for the optical pickup device. The optical functional surface of the objective optical element includes at least two areas of a central area including an optical axis and a peripheral area surrounding the central area. An optical path difference providing structure in the central area is a structure obtained by overlapping a first central basic structure and a second central basic structure which are in a shape of ring-shaped zones divided by step differences, with each other. An optical path difference providing structure in the peripheral area is a structure obtained by overlapping a first peripheral basic structure and a second peripheral basic structure which are in a shape of ring-shaped zones divided by step differences, with each other.

Optical pickup device and objective optical element

There are provided an objective lens for an optical pickup device which can record and/or reproduce information on/from an optical disk with high density with the use of a light flux with a short wavelength while keeping a temperature characteristic to be satisfactory in spite of having a plastic objective lens, and the optical pickup device. The objective lens suppresses generation of a spherical aberration even if a temperature change arises, by sacrificing wavelength characteristics and by enhancing temperature characteristics. Such satisfactory temperature characteristics can be acquired by the ring-shaped structure formed as a turning structure on an optical surface of the objective lens, in which the ring-shaped structure includes ring-shaped zones whose number is 3 or more and 30 or less and the ring-shaped structure is formed such that adjoining ring-shaped zones cause a predetermined optical path difference for an incident light flux.

Objective lens for optical pickup device, and optical pickup device

A time synchronizing signal for synchronizing the times of wireless nodes capable of wireless communication is transmitted to the wireless nodes by multihop. Optional information is transferred by multihop from a predetermined wireless node to an optional node along the same path as the transfer path of the time synchronizing signal by the wireless nodes. Information to respond the optional information is transferred by multihop from the optional wireless node to the predetermined wireless node along the reverse path to the transfer path of the time synchronizing signal.

Wireless communication method and wireless communication system

An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux.

Optical element, aberration correcting element, light converging element, objective optical system, optical pickup device, and optical information recording reproducing device

An objective lens includes a diffraction structure for distributing much of a quantity of an incident light beam into two diffracted lights having different diffraction orders from each other, wherein recording or reproduction of information on an optical disk is performed by converging the diffracted light having a longer focal length of the two diffracted lights onto an information recording surface through a protective layer of the optical disk, and a distance from the objective lens to a surface of the protective layer along an optical axis is longer than a distance between focuses of the two diffracted lights along the optical axis when the diffracted light having the longer focal length is converged onto the information recording surface of the optical disk.

Objective lens comprising a diffraction structure for distributing light in to light of different diffraction orders, optical pickup device, and optical information recording or reproduction apparatus having same

An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P(mm); and a second lens group having positive paraxial power P(mm) for converging a light flux emitted from the first lens group on an information recording surface of an optical information recording medium.

Condenser lens for an objective lens system

An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction when a wavelength of an incident light flux becomes longer, and a second optical path difference providing structure changing spherical aberration in over-corrected direction when a wavelength of an incident light flux becomes longer are superimposed.

Objective lens, optical pickup apparatus and optical information recording and/or reproducing apparatus

A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the refraction action and an optical action given by at least one of the first phase structure and the second phase structure, a light flux from the second light source forms a converged spot on second optical recording medium by a combination of a refraction action of the aspheric surface and an optical action given by at least one of the first phase structure and the second phase structure, and a light flux from the third light source forms a converged spot on third optical recording medium by a combination of a refraction action of the aspheric surface and an optical action given by at least one of the first phase structure and the second phase structure.

Optical pickup apparatus and objective optical element

An optical pickup apparatus comprises a first light source for emitting a first light flux having first wavelength &#x3bb;1 (430 nm&#x3e;&#x3bb;1&#x3e;380 nm), a second light source for emitting a second light flux having second wavelength &#x3bb;2 (&#x3bb;2&#x3e;&#x3bb;1), an objective optical system having phase structure thereon, and at least one moving optical element for guiding the light flux into the objective optical system, the moving optical element being moved in a direction parallel to an optical axis corresponding to the first light wavelength &#x3bb;1 and the second light wavelength &#x3bb;2, wherein the objective optical system has phase structure and satisfies M1=M2=0, where, M1 and M2 denote a first and second magnifications of the objective optical system for recording and/or reproducing the information on or from the first and second optical information media.

Optical pickup apparatus with objective optical system and guiding optical system

An objective lens used for an optical pickup device wherein the optical pickup device includes: light source; and a converging optical system including the objective lens for converging a light beam emitted from the light source to an information recording surface of an optical information recording medium, and the optical pickup device is capable of recording and/or reproducing information by converging the light beam emitted from the light source to the information recording surface of the optical information recording medium with the converging optical system, the objective lens being a plastic single lens and satisfying following formulas when NA is an image-side numerical aperture required for recording and/or reproducing information to the optical information recording medium and f (mm) is a focal length of the objective lens. Even in a plastic single lens having a high NA, thermal aberration does not increase excessively and in a plastic single lens of a refraction type, thermal aberration within the temperature range of practical use in an optical pickup device is suppressed within an allowable range.NA&#x2267;0.8&#x2003;&#x2003;(1)1.0&#x3e;f&#x3e;0.2&#x2003;&#x2003;(2)

Objective lens for optical pickup device, optical pickup device and optical information recording/reproducing apparatus

An optical pickup apparatus for conducting recording and/or reproducing information for a first optical information recording medium including at least a transparent protective substrate, a first information recording surface, and a second information recording surface which are laminated in this order from a light source side along an optical axis, comprising:

Optical pick-up apparatus

Growing community of inventors

Hachioji, Japan

Tohru Kimura