Asahi Kogaku Kogyo Kabushiki Kaisha

Proterial, Ltd.

Nec Corporation

Asahi Kasei Kogyo Kabushiki Kaisha

Canon Kabushiki Kaisha

Hitachi, Ltd.

Hitachi Cable, Inc.

Hitachi Media Electronics Co., Ltd.

Takahiro Sugiyama

Hiroshi Ishikawa

Takahiro Sato

Ken Takei

Detian Huang

Hideki Nonen

Rensuke Adachi

Yohei Shirakawa

Hideyuki Sagawa

Yoshimasa Araki

Makoto Katagishi

Yukio Hagiwara

Izumi Fukasaku

Mitsutoshi Sugawara

Masashi Moriyama

Yoshinori Tsukamoto

Masashi Arai

Kei Nishimura

Ikuo Murata

Masumi Iwamura

Satoshi Adachi

Toshifumi Kubota

Ayano Kato

Xinweilong Li

Noriyuki Imai

The dielectric waveguidetransmits an electromagnetic wave with a frequency of 20 GHz or more and 200 GHz or less and includes a coreincluding a plurality of dielectric waveguide linesthat are bundled together and are composed of a dielectric made of a resin or quartz.

Dielectric waveguide

A cable status management system for managing a wire-break progress of a cable used in a managed device is provided with a cable status management device having a cable status storage unit that stores a wire-break progress data indicating the wire-break progress in the cable, a device user-side data management device that belongs to a device user that uses the managed device, a device manufacturer terminal that belongs to a device manufacturer that manufactures the managed device, and a cable manufacturer terminal that belongs to a cable manufacturer that manufactures the cable. At least the device manufacturer terminal and the cable manufacturer terminal are configured to be accessible with the wire-break progress data stored in the cable status storage unit via a network.

Cable status management system

A signal transmission cable is provided with a conductor, an insulator covering around the conductor, a shield layer covering around the insulator, a sheath covering around the shield layer, and a plating base layer is provided between the insulator and the shield layer to cover around the insulator. The shield layer has a plating layer provided to cover the plating base layer to be in contact with an outer peripheral surface of the plating base layer. A surface roughness of an outer peripheral surface of the plating layer is less than a surface roughness of an inner peripheral surface of the plating layer.

Signal transmission cable

A high frequency signal transmission cable includes a conductor, an insulator provided over a periphery of the conductor, a plating layer provided over a periphery of the insulator, and a sheath provided over a periphery of the plating layer. A crack suppressing layer includes a non-cross-linked polyethylene is provided between the insulator and the plating layer, in such a manner as to remain in contact with the insulator while being provided with the plating layer over an entire periphery of a roughened outer surface of the crack suppressing layer. The crack suppressing layer is unadhered to the insulator. The plating layer is adhered to the crack suppressing layer. The crack suppressing layer suppresses an occurrence of a cracking in the plating layer by bending together with the plating layer while being integral and moving with the plating layer in a longitudinal direction of the cable.

High frequency signal transmission cable

An improved comparator circuit which can operate stably against noise or fluctuation in a power supply is disclosed. The comparator circuit includes a differential amplifier having first and second input terminal, a first diode for biasing the first input terminal at a constant voltage, a second diode coupled between the first and second input terminals, and means for gradually changing the potential at the first input terminal towards the above constant voltage.

Comparator circuit operable for a wide range of input signal

A macro lens system consisting from the object side of a front unit of negative focal length, a middle unit of positive focal length and a rear unit of large focal length. During focusing, all lens units are displaced. Additionally the front and middle units are displaced en masse with respect to the rear unit. Numerical conditions are given on the focal length of the front unit and of the combination of the front and middle unit and on the relative displacements during focusing.

Macro lens system

A lens system for use with an optical disk comprises, in order from the side of a light source, a front group composed of a cemented lens made up of positive and negative lenses, and a rear group composed of a single positive lens or one positive and one negative lens. The lens system satisfying the following conditions:

Lens for use with an optical disk

A lens system for use with an optical disk consisting of a positive lens (+) and a negative lens (-) cemented to the positive lens satisfying the conditions of

Lens system for use with an optical disk

An objective lens for use with an information storage disk comprises a three-group three-element lens system including a first group composed of a positive-meniscus lens having a convex side directed toward a light source, a second group composed of a negative-meniscus lens having a concave side directed toward the light source, and a third group composed of a positive-meniscus lens having a convex side directed toward the light source. The objective lens satisfies the following requirements:

Objective lens for use with information storage disks

An objective system for a video disc comprising four lenses grouped into four lens components. The first lens component is a positive meniscus lens, the second lens component is a positive meniscus lens, the third lens component is a positive meniscus lens having a relatively long focal length or a negative meniscus lens, and the fourth lens component is a positive meniscus lens. The objective system satisfies the following conditions:

Objective system for video disc

An objective system consists of three lens components, the first lens component including a positive meniscus lens convex to the light source, the second lens component including a positive meniscus lens convex to the light source, and the third lens component including a positive meniscus lens concave to the light source. The objective system for a video disc satisfying the following conditions:

A semi-wide angle photographic lens having short overall length is disclosed comprising six lens elements grouped into five components. The fourth component is composed of negative and positive lenses cemented each other to have a positive resultant focal length. The lens system has an aperture ratio of 1:2.8 and a view angle of .+-.24.degree..

Semi-wide angle photographic lens having short overall length

A retrofocus type wide angle photographic lens is disclosed comprising eight lens elements grouped into eight lens components. The lens has an aperture ratio 1:2.5 and a viewing angle of 85.degree..

Retrofocus type wide angle photographic lens

A miniature and large aperture wide-angle lens is composed of ten or eleven lenses grouped in nine lens components. In order from the object to the image side, the first lens component is a positive lens, and the second, third and fourth lens components are each negative meniscus lenses. The fifth lens components is a thick positive lens. The sixth lens component is a positive lens, and a diaphragm is disposed between the fifth and sixth lens components. The seventh lens component is a negative lens. The eighth lens component comprises a negative lens and a positive lens cemented together to form a positive lens. The ninth lens component comprises either one positive lens or two positive lenses.

Miniature and large aperture wide-angle photographing lens

A miniaturized telephoto camera lens assembly comprises a first positive lens, a second negative lens, and a third positive meniscus lens having a higher object side curvature. These lenses are disposed close together, and relatively remote from closely spaced fourth and fifth positive and negative meniscus lenses, respectively, each having higher object side curvatures. The optical parameters of the lens assembly are chosen to satisfy seven specified conditions relating to composite focal distances, spacing distances, Abbe numbers, and refractive index to optimize miniaturization while still achieving a high level of optical performance.

Growing community of inventors

Tokyo, Japan

Takahiro Sugiyama