Patents Assigned to Furukawa Electric Co., Ltd.
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Publication number: 20050184726Abstract: In a rotation sensor including a rotor 10 mounted to a rotating shaft S and having a conductive sensing unit 12 whereof the width varies in the circumferential direction; and stationary cores 31, 32, 41, 42 each including an exciting coil for forming a magnetic circuit with respect to the sensing unit of the rotor by allowing AC exciting current to flow therein, and a core body formed of magnetic material and retaining the exciting coil, and being mounted to the fixed member and disposed so as to oppose to the sensing unit of the rotor at a distance in the axial direction of the shaft, the stationary cores are disposed at two positions each having a central angle with respect to the axis of the shaft other than substantially 180°, so that the rotation sensor which is superior in mountability, is low in cost, and is superior in detection accuracy over a wider range is provided.Type: ApplicationFiled: February 16, 2005Publication date: August 25, 2005Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Tomotaka Watanabe, Takehisa Ishihara, Shinsuke Terada, Takayuki Enomoto
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Publication number: 20050179990Abstract: A pumping light source unit for Raman amplification includes at least one pumping light source that outputs a first pumping light covering a current amplification band; at least one additional pumping light source that outputs a second pumping light covering an amplification band to be extended; and a setting control unit that controls a setting for a gain of an entire amplification band by resetting outputs of the first pumping light and the second pumping light. The pumping light source unit has a function of extending the amplification band in a stepwise manner.Type: ApplicationFiled: January 14, 2005Publication date: August 18, 2005Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Atsushi Oguri, Yoshihiro Emori, Shu Namiki
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Publication number: 20050179552Abstract: An RFID tag which is provided with a coil-shaped antenna such that a conductor is placed on the periphery of a magnetic core, the RFID comprising: the magnetic core, an FPC wound on the periphery of the magnetic core, two or more linear conductor patterns formed in parallel with one another on the FPC, an IC that is connected to the linear conductor patterns and disposed on the FPC, a crossover pattern that electrically connects one end and the other end of outermost linear conductor patterns among the linear conductor patterns formed in parallel with one another, where in the two or more linear conductor patterns, adjacent linear conductor patterns in a joint portion in the wound FPC are electrically connected in respective start edges and end edges.Type: ApplicationFiled: March 30, 2005Publication date: August 18, 2005Applicant: The FURUKAWA ELECTRIC CO., LTD.Inventors: Noriyuki Shoji, Koichi Maeno, Masataka Iegaki
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Publication number: 20050179991Abstract: A Raman amplifying device includes a plurality of Raman amplifiers having a gain wavelength characteristic with a gain peak at which an amplification gain becomes the largest, including a first Raman amplifier having a gain wavelength characteristic with a plurality of gain peaks including a first gain peak and a second gain peak adjacent to the first gain peak; a second Raman amplifier having a gain wavelength characteristic with at least one gain peak including a third gain peak between the first gain peak and the second gain peak; and a third Raman amplifier having a gain wavelength characteristic with a fourth gain peak between the first gain peak and the third gain peak, the fourth gain peak forming an arithmetic sequence between the first gain peak and the third gain peak.Type: ApplicationFiled: April 1, 2005Publication date: August 18, 2005Applicant: THE FURUKAWA ELECTRIC CO., LTDInventors: Koji Fujimura, Masami Ikeda, Misao Sakano
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Publication number: 20050180485Abstract: A semiconductor laser device includes a QW active layer structure including a GaxIn1-xAs1-ySby layer wherein 0.3?1-x and 0.003?y?0.008, or a QW active layer structure including a GaxIn1-xAs1-y2Ny1Sby2 layer wherein 0.3?1-x, 0<y1<0.03 and 0.002?y2?0.06. The semiconductor laser device suppresses the three-dimensional epitaxial growth, and has superior optical characteristics including a low threshold current.Type: ApplicationFiled: April 18, 2005Publication date: August 18, 2005Applicant: The Furukawa Electric Co., Ltd.Inventors: Hitoshi Shimizu, Koji Kumada
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Patent number: 6929324Abstract: In a vehicle seat, a central support member typically consisting of wire mesh or grid and supports most of the load of the vehicle occupant via spring members, and undergoes a relatively large displacement when the occupant is seated in the seat. Thus, by detecting the displacements of various parts of the central support member, preferably peripheral parts thereof, the magnitude of the total load and distribution of the load can be evaluated both reliably and accurately. Additionally, displacement sensors for measuring such large displacements are relatively inexpensive and easy to handle. Also, such sensors would not interfere with the existing seat designs, and would not be adversely affected by the equipment of the seat such as seat heaters.Type: GrantFiled: July 28, 2003Date of Patent: August 16, 2005Assignees: NHK Spring Co., Ltd., The Furukawa Electric Co., Ltd.Inventors: Takayuki Enomoto, Takashi Takeshita, Takuya Nishimoto, Naobumi Kuboki, Katsutoshi Sasaki, Norio Kawashima, Hiroaki Nishiguma, Atsuo Matsumoto, Shinichi Horibata, Ko Masuda, Yuji Niikura, Hiroshi Matsunaga, Yuji Tokiwa
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Publication number: 20050174664Abstract: A dielectric multi layer thin film type band-pass filter provided with the function of transmitting a predetermined wavelength band, the function of reflecting a predetermined wavelength band or both functions, where a film structure of the dielectric multi layer thin film optical filter is configured of, with respect to the center wavelength ? as a reference of the optical film thickness, (1) mirror layers each comprised of alternately layered layers (H) of high refractive index material and layers (L) of low refractive index material each with an optical film thickness of ?/4, and (2) spacer layers each of which is configured in a combination of a layer (nH: n is an integer) of high refractive index material and a layer (nL: n is an integer) of low refractive index material each with an optical film thickness of ?/4 and has a total optical film thickness of an integral multiple of ?/2.Type: ApplicationFiled: October 22, 2004Publication date: August 11, 2005Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Takahiro Ito, Kazuhiro Minagawa
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Publication number: 20050172675Abstract: A method of manufacturing an optical fiber includes heating at least a portion of an optical fiber preform, drawing an optical fiber at a speed of 500 m/min from the optical fiber preform heated, and impressing a spin on the optical fiber, while drawing, alternately in a clockwise and in a counterclockwise direction with a predetermined angle. Maximum spatial frequency of the spin per meter y satisfies exp(24x?12)?y?4 where x is non-circularity of the cladding in percent. The optical fiber has a relative refractive index difference of 0.3% to 0.5%, and a mode field diameter of 8 ?m to 10 ?m at a wavelength of 1310 nm, A polarization mode dispersion of the optical fiber manufactured is 0.5 ps/km1/2 or less at the wavelength of 1310 nm.Type: ApplicationFiled: February 11, 2004Publication date: August 11, 2005Applicant: The Furukawa Electric Co., Ltd.Inventor: Fumio Takahashi
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Patent number: 6925703Abstract: A method for producing an insulated wire having a cross section of a desired shape, in which a conductor having a cross section of a desired shape is coated with an insulating film, which method comprises: supplying a raw conductor while passing through a rolling unit composed of at least one pair of rolling rolls that are capable of freely rotating without a drive mechanism and that have a desired shape, thereby forming a conductor having a cross section of a desired shape; and coating the conductor with an insulating film.Type: GrantFiled: October 1, 2001Date of Patent: August 9, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Toshinobu Harada, Masaki Sugiura, Satoshi Saitou
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Patent number: 6925893Abstract: A rotation sensor includes a first rotor constituted by a magnetic material and having an outer face that has first conductive layers disposed in two levels as viewed in the direction of a rotation axis and second conductive layers disposed outwardly of and between the first conductive layers, a second rotor having metal members corresponding to the first conductive layers of the first rotor, and a stationary core having a stationary core body that accommodates therein two exciting coils that are spaced from each other in the direction of the rotation axis. The second rotor is disposed between the first rotor mounted to a first shaft and the stationary core fixed to a stationary member, and is mounted to a second shaft which is rotatable relative to the first shaft.Type: GrantFiled: September 17, 2002Date of Patent: August 9, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Fumihiko Abe, Kengo Tanaka, Dongzhi Jin, Kazuhiko Matsuzaki, Tsuyoshi Nakamoto, Masakazu Matsui, Hideharu Yonehara, Tomotaka Watanabe, Kosuke Yamawaki, Takahiro Ueno
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Publication number: 20050168805Abstract: By optimizing the refractive index profile, the absorption coefficient of a rare earth element doped optical fiber can be enlarged and nonlinear effect can be suppressed. Thus, according to the present invention, the optical fiber, which is suitable for wide band optical amplification, can be realized. Moreover, in the present invention, the optical fiber of W-shape profile comprising a core, the first cladding having a refractive index smaller than that of said core surrounding said core, and the second cladding having a refractive index smaller than that of said core and larger than that of said first cladding surrounding said first cladding is prepared and are suitable for the wide band optical amplification.Type: ApplicationFiled: January 7, 2005Publication date: August 4, 2005Applicant: The Furukawa Electric Co., Ltd.Inventor: Keiichi Aiso
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Patent number: 6925102Abstract: A semiconductor laser device which has a diffraction grating partially provided in the vicinity of an active layer formed between a radiation-side reflection film provided on a radiation-side end surface of a laser beam and a reflection film provided on a reflection-side end surface of the laser beam, and which outputs a laser beam having a desired oscillation longitudinal mode based on a wavelength selection characteristic of at least the diffraction grating. The diffraction grating is formed in isolation with an isolation distance of Ls=15 ?m from the radiation-side reflection film.Type: GrantFiled: September 30, 2002Date of Patent: August 2, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Junji Yoshida, Naoki Tsukiji, Satoshi Irino
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Publication number: 20050163444Abstract: An optical fiber includes a first core with a first refractive index located in a central portion of the optical fiber; a second core with a second refractive index located in an outer periphery of the first core; a third core with a third refractive index located in an outer periphery of the second core; and a cladding with a fourth refractive index located in an outer periphery of the third core, where among the refractive indices, the first one>the third one>the fourth one>the second one. The absolute value of dispersion at the wavelength of 1550 nm is not more than 20 ps/nm/km. The effective area at the wavelength is not more than 15 ?m2. The nonlinear constant n2/Aeff at the wavelength of 1550 nm is equal to or more than 25×10?10/W.Type: ApplicationFiled: January 25, 2005Publication date: July 28, 2005Applicant: The FURUKAWA ELECTRIC CO., LTD.Inventors: Ryo Miyabe, Jiro Hiroishi
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Patent number: 6922392Abstract: Polishing judgment is performed using an algorithm in which an intermediate variable [K] is provided before judging a time difference between an estimated arrival time [TAT] of a packet and an actual packet arrival time [t(k)], and to which a unit is added. The unit calculates [K=TAT?t(k)], and compares the calculated value with a counter overflow judgment time [M] obtained from a sum [L+D] of a packet arrival permissible time [L] and a standard packet interarrival time [D].Type: GrantFiled: March 4, 2003Date of Patent: July 26, 2005Assignee: The Furukawa Electric Co., Ltd.Inventor: Norio Matsufuru
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Patent number: 6921677Abstract: When manufacturing semiconductor elements, a group of semiconductor elements having a diffraction grating formed partly on the side of the facet from which laser light is emitted is formed collectively on a semiconductor wafer by using semiconductor process technologies. The semiconductor laser elements are arranged such that the light emitting facets are opposite to each other to thereby form each diffraction grating of the semiconductor laser elements arranged opposite to each other as one diffraction grating, cleaving this diffraction grating at respective cleavage planes to cut out laser bars, followed by the cleavage of cleavage planes to cut out semiconductor laser elements.Type: GrantFiled: December 14, 2001Date of Patent: July 26, 2005Assignee: The Furukawa Electric Co., LTD.Inventors: Naoki Tsukiji, Satoshi Irino
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Patent number: 6922332Abstract: An electric connection box includes upper and lower cases which accommodate therein bus bars, an insulator for the bus bars, fuses, and first relays. A relay module mounted with second relays is accommodated in the upper and lower cases. The electric connection box includes the relay module, but is compact in size, light in weight, low-priced, and low in heat generation due to contact resistance.Type: GrantFiled: March 10, 2003Date of Patent: July 26, 2005Assignees: Furukawa Electric Co., Ltd., Omron CorporationInventors: Fumikazu Naimi, Kazuo Miyajima, Masami Takase, Koichi Shima, Kiyoshi Takezawa, Akihiko Hirata
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Publication number: 20050157994Abstract: Optical fibers to form an optical transmission line suitable for WDM transmission in a wide-spreading wavelength band, having the following characteristics and parameters: a dispersion in absolute value of 0.5 ps/nm/km to 9 ps/nm/km in a wavelength band of 1430 nm to 1625 nm, a dispersion slope in absolute value of 0.04 ps/nm2/km or less at a wavelength of 1550 nm, a mode field diameter of 7 ?m or less at a wavelength of 1550 nm and a cable cutoff wavelength of less than 1430 nm; core 11 surrounded by cladding 7, core 11 being at least two-layered (first layer 1 at the center and second layer 2 surrounding the first layer; relative refractive index of glass layer ?1 with reference to the cladding being adjusted to not less than 0.6 but not more than 1.6%, relative refractive index of second layer ?2 with reference to the cladding being adjusted to a negative value.Type: ApplicationFiled: December 28, 2004Publication date: July 21, 2005Applicant: The Furukawa Electric Co., Ltd.Inventor: Naomi Kumano
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Publication number: 20050157379Abstract: In a Raman amplifier using three or more pumping wavelengths, when the pumping wavelengths are divided into a short wavelength side group and a long wavelength side group at the boundary of the pumping wavelength having the longest interval between the adjacent wavelengths, the short wavelength side group includes two or more pumping wavelengths having intervals therebetween which are substantially equidistant, and the long wavelength side group is constituted by two or less pumping wavelengths.Type: ApplicationFiled: March 15, 2005Publication date: July 21, 2005Applicant: The Furukawa Electric Co. Ltd.Inventors: Yoshihiro Emori, Shu Namiki
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Patent number: 6920265Abstract: An arrayed waveguide grating optical multiplexer/demultiplexer includes an arrayed waveguide connected to at least one first optical waveguide via a first slab waveguide, a plurality of second optical waveguides connected to the arrayed waveguide via a second slab waveguide. At least one expanding width waveguide has a first end portion and a second end portion having a second width larger than a first width of the first end portion. Each first end portion is connected to each first optical waveguide. The second end portion is connected to the first slab waveguide. The first width of the first end portion is larger than a first optical waveguide width of the at least one first optical waveguide. The first width of the first end portion satisfies a single mode condition. A width of the expanding width waveguide increases from the first end portion toward the second end portion.Type: GrantFiled: November 5, 2002Date of Patent: July 19, 2005Assignee: The Furukawa Electric Co., Ltd.Inventors: Kazuhisa Kashihara, Kazutaka Nara
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Publication number: 20050152577Abstract: The present invention provides a planer acoustic transducer including a vibrating diaphragm including a spiral voice coil provided on both surfaces or on one surface of an insulating base film; and a permanent magnet corresponding to the voice coil, wherein, in the vibrating diaphragm, the spiral voice coil is formed by applying a wire conductor, in a coil pattern, onto a sheet-like substrate having an adhesive layer on at least one surface thereof. Alternatively, at least a portion of the vibrating diaphragm, which portion corresponds to the loop of a first or second vibration mode, is reinforced with a rigidity-imparting member; the substrate of the vibrating diaphragm is formed of a resin foam; or the voice coil is formed three-dimensionally.Type: ApplicationFiled: February 28, 2003Publication date: July 14, 2005Applicant: The FURUKAWA ELECTRIC CO., LTD.Inventors: Takeshi Nishimura, Kenji Iizuka, Masayuki Ishiwa, Shigeo Yamaguchi, Tsutomu Yokoyama, Masaaki Arahori, Hideharu Yonehara, Hiroshi Ikeda, Sadaaki Sakurai
