Sumitomo Electric Industries, Limited

Kyoto University

Keio University

Tatsuhiko Saito

Toshio Danzuka

Michihisa Kyoto

Hiroshi Suganuma

Akira Urano

Tomomi Moriya

Masaharu Mogi

Yasuhiko Shishido

Shinji Ishikawa

Yuichi Ohga

Masumi Ito

Eisuke Sasaoka

Hiroshi Yokota

Hiroo Kanamori

Yuji Kobayashi

Ichiro Tsuchiya

Sumio Hoshino

Takayuki Shimazu

Katsuya Nagayama

Masato Tanaka

Kazuya Kuwahara

Kenichiro Takahashi

Eiichiro Yamada

Kazunori Okada

Tetsutarou Katayama

Eiji Okada

Toshihiro Munemitsu

Akira Ishii

Maya Miyata

A detection apparatus for detecting foreign substances or defective goods, with which it is easy to accomplish inspection even if the inspection objects have a shape that tends to allow rolling, comprises: transparent membersand, partitionsand, a supplying unit, camerasand, a control unit. A removing apparatus, which includes such detection apparatus, comprises a suction controllerand suction nozzlesto. While the partitionsmove around, inspection objects A are each put in each cell of the partitions, and are photographed by the camerasand, from above and below the transparent members, respectively. The images obtained by such photographing are analyzed, and foreign substances or defective goods mingling in the inspection objects A are detected. The foreign substances or defective goods are separated from the conforming goods by selectively sucking the inspection objects A with the suction nozzlesto

Detecting apparatus, removing apparatus, detecting method, and removing method

The present invention relates to a blood vessel wall analyzing apparatus provided with a structure enabling accurate measurement of plaque components in a blood vessel wall in a state that reduces the burden on a patient. In the blood vessel wall analyzing apparatus (), measurement light is illuminated onto a measured portion within a blood vessel such as a carotid artery (C) from a light illuminating unit () provided outside the blood vessel, while light from the measured portion is detected in a light receiving unit () provided outside the blood vessel. Thus, since the status of the blood vessel wall can be analyzed without inserting an apparatus involved in measurement into the blood vessel, the burden on the patient is reduced during measurement. In addition, as a result of carrying out measurement using near infrared light (a light component in the wavelength range of 780 nm to 2750 nm) that exhibits characteristics that differ according to the compositions of substances such as plaque adhered within the blood vessel, analysis can be carried out that distinguish compositions such as plaque using an analyzing apparatus provided outside the blood vessel.

Blood vessel wall analyzing device and blood vessel wall analyzing method

The present invention relates to an optical fiber having a configuration which enables utilization of nonlinear phenomena in the near-infrared region. The optical fiber is directed to a holey fiber having a core region extending along a predetermined axis and a cladding region with plural holes arranged along the core region. The plural holes are arranged to constitute plural layers about the core region in the cross-section orthogonal to the predetermined axis. The three holes constituting the first layer (the innermost layer) closest to the core region correspond to three vertexes from among the six vertexes of a regular hexagon and are placed such that the arrangement of the three holes has three-fold rotational symmetry. The optical fiber enables utilization of nonlinear phenomena in the near-infrared region, by properly adjusting the hole diameter d and the pitch L between adjacent holes from among the holes constituting a single layer.

Optical fiber

A process of manufacturing a silica glass article comprising the steps of: (1) irradiating a silica glass article with electromagnetic waves to generate defects therein; and (2) immersing the thus irradiated silica glass article in an atmosphere comprising a hydrogen gas, thereby providing the resulting silica glass article with a characteristic that is effective for preventing it substantially from increasing its absorption within an ultraviolet region due to ultraviolet ray irradiation. Also disclosed are a silica glass article or a glass fiber produced according to the manufacturing process.

Silica glass article and manufacturing process therefor

In a method of elongating a glass preform comprising the steps of holding both ends of the glass preform with a first holding section and a second holding section , respectively; moving the first holding section and the second holding section in a longitudinal direction of the glass preform with the moving speed of the first holding section faster than that of the second holding section and, at the same time, heating and softening the glass preform by a heating section successively; and elongating the glass preform by a tensile force applied thereto, so as to form an elongated body ; an electric furnace is employed in the heating section ; and said method further comprising the steps of setting a reference value R with respect to an outside diameter at a specific position in a tapered region in the glass preform in the process of elongating; acquiring an actually measured value R at the specific position ; and controlling the moving speed of the first holding section and/or second holding section according to a value (R /R ) obtained from the reference value R and actually measured value R

Method of elongating glass preform

In a heating furnace which holds at least one end of a glass rod with a holding portion and elongates the glass rod by softening the glass rod successively from the other end portion thereof with heating while applying a tensile force thereto, the heating furnace comprises a tubular portion through which the glass rod to be elongated is inserted such as to be longitudinally movable; heater, positioned within the tubular portion such as to circumferentially surround the glass rod, for heating the glass rod; a moving portion through which one end of the glass rod is inserted; bellows the ends of which are respectively secured to the moving portion and the tubular portion and which is longitudinally expandable and contractible and composed of at least a double cylinder surrounding the part of the glass rod such as to block an outside air from flowing into the heating furnace; and gas supply line for supplying, for purging, an inert gas into a space within the tubular portion and the inner bellows as well as the space between inner and outer bellows.

Glassrod elongation heating furnance having double bellows

A furnace body for a glass preform elongating apparatus which makes an elongated body by passing the glass preform through the furnace body and elongating the glass preform while heating the glass preform, the furnace body comprising a furnace core tube shaped like a cylinder through which the glass preform passes and having so adequate length in an axial direction that the elongated body may not bend or distort its form, a heating member disposed at an outer peripheral portion of the furnace core tube, a thermal insulator enveloping the furnace core tube and the heating member from outside in circumferential and axial directions thereof, and a furnace body outer shell holding the thermal insulator therein, wherein a through hole is disposed near the heating member downstream thereof in an advancing direction of the glass preform so as to penetrate through the furnace core tube, thermal insulator, and furnace body outer shell in the direction orthogonal to the furnace core tube.

Elongating apparatus and method for glass preform and furnace body for

The present invention relates to a method for precisely elongating a glass preform of an optical fiber body having a desired outer diameter. In this method, a predetermined part of the glass preform is elongated as tensile stress is applied to one end of the glass preform while a predetermined part of the glass preform is heated and softened successively from one end toward the other end of the glass preform. In this elongating operation, while the outer diameter of the softening portion of the glass preform is measured, the tensile stress is adjusted such that the outer diameter of the softening portion coincides with a preset value of the control outer diameter. In particular, this method is characterized in that the preset value of the control outer diameter is changed at least during a predetermined period until termination of elongation or during a predetermined period from the start of elongation.

Method for elongating glass preform

A UV light-permeable optical glass consisting of a fluorine-doped synthetic quartz glass, which has a long term reliability.

UV light-permeable glass and article comprising the same

The present invention comprises a waveguide substrate and an optical waveguide disposed on the substrate, the optical waveguide having an optical waveguide region as a light transmission path, an insertion region for inserting an optical functional component having a mode field width of light propagating therein larger than that of light propagating in the optical waveguide region, and an optical connection region provided between the optical waveguide region and the insertion region to change a mode field width of light propagating therein.

Optical waveguide device for receiving functional component

A glass preform for use in the fabrication of an optical fiber having a reduced transmission loss is produced by synthesizing a soot preform by a vapor synthesis method and consolidating the soot preform in an electric furnace to obtain a glass preform, wherein an intermediate body consisting of a core portion and an inner part of a cladding portion is consolidated under atmospheric pressure and an outer part of the cladding portion which surrounds a periphery of the intermediated body is consolidated under reduced pressure or in vacuo.

Growing community of inventors

Yokohama, Japan

Tatsuhiko Saito