Patents by Inventor Juichi Noda
Juichi Noda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6466723Abstract: A cleaning tool for cleaning optical fiber connectors exposes a cleaning sheet in a window of the case. A winding pulley is operable to wind the cleaning sheet upon rotation at a constant pitch. A rotation mechanism, that is operated by a lever, rotates the winding pulley. The case is constructed of a first front plate and a second front plate which are closed off by a perimeter wall along their outer circumference. The case has an open portion in a part of the perimeter wall, and the lever is disposed in the open portion in an inclined orientation.Type: GrantFiled: March 1, 2001Date of Patent: October 15, 2002Assignee: NTT Advanced Technology CorporationInventors: Taisei Miyake, Ai Fukuhara, Juichi Noda, Etsuji Sugita, Hitoshi Goto, Isao Iwakane, Kou Niida, Yuji Takaoka
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Publication number: 20010033728Abstract: The cleaning tool for optical fiber connectors exposes the cleaning sheet in the window for cleaning of the case. The winding pulley winds the cleaning sheet with rotating in a constant pitch. A rotation mechanism operated by lever rotates the winding pulley. In the case, a first front plate and a second front plate is closed off by a perimeter walls along their outline. The case has the opened portion opening a part of the perimeter wall, and the lever is disposed in the opened portion to be able to incline.Type: ApplicationFiled: March 1, 2001Publication date: October 25, 2001Inventors: Taisei Miyake, Ai Fukuhara, Juichi Noda, Etsuji Sugita, Hitoshi Goto, Isao Iwakane, Kou Niida, Yuji Takaoka
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Patent number: 5332535Abstract: A dielectric multilayer filter applicable to optical communication systems is disclosed, as is a fabrication method therefor, and an optical element incorporating the same. The disclosed dielectric multilayer filter includes a fluorinated polyimide base layer with a dielectric multilayer formed thereover. According to the disclosed fabrication method, a fluorinated polyimide layer is formed by applying liquid fluorinated polyimide material over a smooth surface to a predetermined thickness followed by drying and hardening, after which a dielectric multilayer is formed over the fluorinated polyimide layer by an ion assist vapor deposition method, and then stripping the fluorinated polyimide layer away from the underlying smooth surface. The disclosed dielectric multilayer filter can be easily and economically produced at a suitably small thickness with no need for grinding, exhibits highly uniform physical and optical properties, and is exceedingly durable and resistant to curling and warping.Type: GrantFiled: April 30, 1993Date of Patent: July 26, 1994Assignee: Nippon Telegraph and Telephone CorporationInventors: Taisuke Oguchi, Hiroaki Hanafusa, Juichi Noda, Yamada Noriyoshi, Shiro Nishi, Nobuo Tomita
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Patent number: 5252493Abstract: An ultra-sensitive laser magnetic immunoassay method comprising the steps of: labeling an antigen or antibody with micro-particles of a magnetic substance to form a magnetic-labeled body; subjecting a specimen and the magnetic-labeled body to an antigen-antibody reaction to form a reacted body-specimen complex; separating and removing unreacted body from the reacted complex; guiding and concentrating the reacted complex magnetically; irradiating the concentrated complex with a laser beam; detecting outgoing light from a measurement system to provide a quantitative result in the picogram range. An apparatus comprising a specimen container for storing a specimen labeled with magnetic micro-particles, concentration means for guiding and locally concentrating the specimen, a laser beam irradiating optical system for guiding a laser beam into the specimen, and a light receiving system arranged so as to detect outgoing beams from the specimen.Type: GrantFiled: July 22, 1988Date of Patent: October 12, 1993Assignee: Nippon Telegraph and Telephone CorporationInventors: Koichi Fujiwara, Juichi Noda, Hiromichi Mizutani, Hiroko Mizutani
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Patent number: 5238810Abstract: A laser magnetic immunoassay (LMIA) method which enables detection of less than picograms of target analyte in milliliter of analyte solution. The method involves the steps of: affixing an antibody or antigen on the surface of non-magnetic carrier particles; immunoreacting the affixed antibody or antigen to capture a target analyte contained in a specimen; preparing magnetic labeled microparticles treated so as to bind with the target analyte; reacting the labeled complex to sandwich the target analyte between the magnetic particles and the non-magnetic carrier particles; separating the free species from the bound species by centrifugation; dispersing the precipitated solid to make an analyte solution; applying a spot magnetic field gradient on the analyte solution and irradiating a selected spot with a laser beam; and analyzing the resulting interference patterns to quantitatively determine the quantity of target analyte.Type: GrantFiled: July 15, 1992Date of Patent: August 24, 1993Assignee: Nippon Telegraph and Telephone CorporationInventors: Koichi Fujiwara, Juichi Noda, Hiroko Misutani, Hiromichi Mizutani, deceased
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Patent number: 5234772Abstract: A dielectric multilayer filter applicable to optical communication systems is disclosed, as is a fabrication method therefor, and an optical element incorporating the same. The disclosed dielectric multilayer filter includes a fluorinated polyimide base layer with a dielectric multilayer formed thereover. According to the disclosed fabrication method, a fluorinated polyimide layer is formed by applying liquid fluorinated polyimide material over a smooth surface to a predetermined thickness followed by drying and hardening, after which a dielectric multilayer is formed over the fluorinated polyimide layer by an ion assist vapor deposition method, and then stripping the fluorinated polyimide layer away from the underlying smooth surface. The disclosed dielectric multilayer filter can be easily and economically produced at a suitably small thickness with no need for grinding, exhibits highly uniform physical and optical properties, and is exceedingly durable and resistant to curling and warping.Type: GrantFiled: February 12, 1991Date of Patent: August 10, 1993Assignee: Nippon Telegraph and Telephone CorporationInventors: Taisuke Oguchi, Hiroaki Hanafusa, Juichi Noda, Noriyoshi Yamada, Shiro Nishi, Nobuo Tomita
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Patent number: 5101462Abstract: Two single mode optical fibers are reduced in diameter over a predetermined length to form reduced-diameter portions whose center portions have different diameters. The two optical fibers are intersected at a small angle to each other substantially centrally of their reduced-diameter portions and then are fused together at the intersecting portions and the fused portions of the two optical fibers are heated and stretched to provide an optical coupler having a desired coupling ratio.Type: GrantFiled: September 19, 1990Date of Patent: March 31, 1992Assignees: Japan Aviation Electronics Industry Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Sasaki, Masato Shimamura, Yoshiaki Takeuchi, Hiroaki Hanafusa, Juichi Noda
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Patent number: 5095516Abstract: Two single mode optical fibers are stretched to form prestretched portions of different diameters, and then the optical fibers are fused together at their prestretched portions to form a coupling region which is stretched to obtain a wide-band optical fiber coupler of a desired splitting ratio.Type: GrantFiled: September 19, 1990Date of Patent: March 10, 1992Assignees: Japan Aviation Electronics Industry Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Sasaki, Masato Shimamura, Yoshiaki Takeuchi, Hiroaki Hanafusa, Juichi Noda
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Patent number: 5016970Abstract: A ferrule for optical fibers transmitting linearly polarized light capable of preventing deterioration and fluctuation of the extinction ratio. The ferrule incorporates at least two paths connecting a region in a vicinity of an end of a puncture for an optical fiber inside the flange portion with outside of the ferrule. These paths effectively enable the removal of air in such a region which could have caused an extraneous stress on the optical fiber resulting in deterioration of the extinction ratio. An optical fiber connector using this ferrule is also disclosed.Type: GrantFiled: August 10, 1989Date of Patent: May 21, 1991Assignee: Nippon Telegraph and Telephone Corp.Inventors: Ryo Nagase, Juichi Noda, Etsuji Sugita
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Patent number: 5009478Abstract: In a method of making an optical fiber coupler through heat elongation of optical fibers, the performance of the coupled optical fibers is measured after the optical fibers are heat elongated at least once, and based on the measured elongation length and the performance of the coupled optical fibers, a functional equation representing their relationship is determined by approximate calculation. The functional equation is used to calculate an elongation length which provides the intended performance of the coupled optical fibers, and then the optical fibers are heat elongated to the calculated length.Type: GrantFiled: November 7, 1989Date of Patent: April 23, 1991Assignees: Japan Aviation Electronics Industry Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Sasaki, Masato Shimamura, Juichi Noda, Hiroaki Hanafusa, Yoshiaki Takeuchi
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Patent number: 4901123Abstract: According to this invention, a superluminescent diode includes a current injection portion having a current injection electrode formed adjacent to a first end face, a light-absorption portion contiguous with the current injection portion; and a waveguide continuously formed to extend from the current injection portion to the light-absorption portion. The waveguide is constituted by an active layer and a member which completely buries the active layer, has a bandgap larger than that of the active layer, and is formed of a material having a small refractive index. The waveguide of the current injection portion is linearly formed to be perpendicular to the first end face. The waveguide of the light-absorption portion has an end portion for guiding reflected light in a direction different from a propagation direction of light propagating through the waveguide.Type: GrantFiled: November 28, 1988Date of Patent: February 13, 1990Assignee: Nippon Telegraph and Telephone CorporationInventors: Yoshio Noguchi, Haruo Nagai, Kazumasa Takada, Juichi Noda
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Patent number: 4869570Abstract: A fiber coupler includes first and second optical fiber groups and a fused-elongated region. The first optical fiber group is obtained by parallelly arranging a plurality of optical fibers on a single plane, a coating of each of the optical fibers being removed throughout a predetermined portion at the same position as that of an adjacent optical fiber in a longitudinal direction. The second optical fiber group is obtained by parallelly arranging adjacent optical fibers on a predetermined plane parallel to an arrange plane of the first optical fiber group at the same pitch as that of the first optical fiber group, a coating of each of the optical fibers being removed throughout a predetermined portion at the same position as that of an adjacent optical fiber in a longitudinal direction as the first optical fiber group.Type: GrantFiled: February 19, 1988Date of Patent: September 26, 1989Assignee: Nippon Telegraph and Telephone CorporationInventors: Itaru Yokohama, Kazunori Chida, Juichi Noda, Hiroaki Hanafusa, Yoshiaki Takeuchi, Mitsuhiro Tateda
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Patent number: 4792230Abstract: A method and apparatus for measuring ultrashort optical pulses is described. Pulse waveforms to be measured are the type which vary at high speed in a time close to or less than the response time of an optical detector. Changes of optical wavelength or frequency are measured at various sections of that pulse. The light to be measured is split into two beams, and recombined after provided with different delay times, respectively. The combined light is caused to enter a doubling crystal to generate a second-harmonic light, and the second-harmonic light component, or both the second-harmonic and fundamental components, is measured. The intensity shape and chirping of the pulses is obtained from the changes in the intensity of these components as a function of delay time difference by Fourier analysis including iterative arithmetic operations.Type: GrantFiled: September 8, 1987Date of Patent: December 20, 1988Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazunori Naganuma, Juichi Noda
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Patent number: 4480897Abstract: A single-polarization single mode optical fiber of the type comprising an elliptical core, a pair of stress applying parts on both sides of the minor radius of the elliptical core for applying asymmetrical stress thereto and a clad embedding therein the core and the stress applying parts, the stress applying parts being made of B.sub.2 O.sub.3 wherein a relative refractive index difference .DELTA. between the core and the clad satisfies a relation 0.004.ltoreq..DELTA..ltoreq.0.05, an ellipticity .epsilon. satisfies a relation 0.01.ltoreq..epsilon..ltoreq.0.9, the B.sub.2 O.sub.3 has a molar concentration of 1 to 25 mole %, ratio of thickness of the stress applying parts and the core is 5 to 15, a modal birefringence B expressed by an equation B=(.beta..sub.x -.beta..sub.y)/k satisfies a relation B=1.times.10.sup.-6 where (.beta..sub.x -.beta..sub.y) represents a propagation constant difference between HE.sub.11.sup.x and HE.sub.11.sup.Type: GrantFiled: June 15, 1982Date of Patent: November 6, 1984Assignee: Nippon Telegraph & Telephone Public CorporationInventors: Katsunari Okamoto, Toshihito Hosaka, Yutaka Sasaki, Juichi Noda, Takao Edahiro