Patents by Inventor Takuji Yamamoto
Takuji Yamamoto 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).
-
Publication number: 20110019296Abstract: An object of the invention is to provide an optical filter that prevents an optical thin film formed on an optical plate from being partially removed, and prevents micro-cracks occurring in an outer peripheral edge section of a principle surface of the optical plate, and that has a high yield rate. An optical filter is provided with an optical plate which has a chamfered section formed on an outer peripheral edge section of one principle surface of the optical plate, and has isotropy with respect to wet-etching, and the chamfered section is of an arc shape which is cross-sectionally concave in an inward direction of the optical plate, and is formed by means of wet-etching. A crossing angle between the one principle surface and a concave surface where the chamfered section is formed, and a crossing angle between the concave surface and a side surface of the optical plate 3 where the chamfered section is formed, namely, crossing angles ?G and ?H are respectively 100° or greater and less than 180° .Type: ApplicationFiled: July 20, 2010Publication date: January 27, 2011Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Takuji Yamamoto, Nobuo Hiruma, Motoo Takada, Kozo Ono, Masahiro Yoshimatsu, Takehiro Takahashi
-
Publication number: 20100329727Abstract: An image forming apparatus having a cleaner for cleaning a surface of a dust-proof glass disposed on a housing of a laser scanning unit for irradiating a photosensitive member with a laser modulated in accordance with image data. The cleaner is supported by a frame of the image forming apparatus body such that the cleaner is movable while keeping in contact with the dust-proof glass and such that the cleaner stays in a stand-by position while keeping out of contact with the dust-proof glass and the housing of the laser scanning unit.Type: ApplicationFiled: June 24, 2010Publication date: December 30, 2010Applicant: Konica Minolta Business Technologies, Inc.Inventors: Kenichi ASHIDA, Takuji Yamamoto, Hideaki Ikeda, Shinji Yanase
-
Publication number: 20100253436Abstract: An amplifier is realized by a distributed-constant-type amplifier including an input-side transmission line and an output-side transmission line, and a plurality of unit circuits coupled between the input-side transmission line and the output-side transmission line, in which each of the plurality of unit circuits is formed by including an amplification circuit having a gain equal to or greater than one.Type: ApplicationFiled: February 19, 2010Publication date: October 7, 2010Applicant: FUJITSU LIMITEDInventors: Kouichi Kanda, Takuji Yamamoto
-
Patent number: 7643601Abstract: The invention concerns an optical transmitter and receiver, and provides an improved timing extraction circuit for use in an optical receiver that uses a clock of a frequency equal to one half the data transmission rate, and a duty cycle deviation handling circuit for use in the optical transmitter and receiver. The timing extraction circuit uses a PLL circuit containing a phase comparator circuit for performing a phase comparison between a data signal of bit rate B (bits/s) and a clock signal of B/2 (Hz) at intervals of 2/B (sec), and comprises: a detection circuit for detecting the absence of an output of phase comparison information from the phase comparator circuit by receiving a data signal of a prescribed pattern; and a control circuit for controlling, upon detecting the absence, the phase of the clock signal in order to maintain synchronization.Type: GrantFiled: August 18, 2003Date of Patent: January 5, 2010Assignee: Fujitsu LimitedInventors: Naoki Kuwata, Takuji Yamamoto
-
Patent number: 7560074Abstract: The present invention provides a sample breaking-up instrument and a method thereof, in which a pressing member is pressed by a centrifugal force against a sample within a cylindrical body provided with a filter member to thereby break-up the sample safely and efficiently. Provided is an instrument for breaking-up a sample, comprising: a cylindrical body having a through hole opening in both ends thereof; a filter member installed in one end of the cylindrical body within the through hole; and a pressing member to be operatively inserted into the hole of the cylindrical body from the other end thereof so as to be slidable therethrough in a sealed manner, wherein a force is exerted on the pressing member so that the pressing member presses the sample placed between the pressing member and the filter member against the filter member and thereby the sample is forced to pass through the filter member and is thus broken-up.Type: GrantFiled: December 17, 2004Date of Patent: July 14, 2009Assignee: Nippi, Inc.Inventors: Takuji Yamamoto, Yuko Ushiki, Shunji Hattori, Shinkichi Irie
-
Publication number: 20090128210Abstract: An electric circuit has a first differential circuit for transmitting input data to a first node, a second differential circuit for holding the first node data, a first clock transmission circuit for flowing a first current in accordance with a clock signal, and a first transformer circuit for transformer-coupling the first differential circuit with the first clock transmission circuit, and the second differential circuit with the first clock transmission circuit.Type: ApplicationFiled: November 12, 2008Publication date: May 21, 2009Applicant: FUJITSU LIMITEDInventor: Takuji YAMAMOTO
-
Patent number: 7493690Abstract: In a method of attaching an electronic component to a printed circuit board by a plurality of screws that are inserted into corresponding through holes cut in the board from a surface of the board and then screwed into corresponding screw holes formed in the component mounted on an opposite surface, the component is screwed onto the board using one of the screws and the component and the screw are soldered onto the board with lead-free solder. After they have been cooled down, the component is screwed onto the board using remaining screws. With this, the strength of the connection between the component and board is improved and also the occurrence of warp of the board and component can be prevented.Type: GrantFiled: July 5, 2005Date of Patent: February 24, 2009Assignees: Keihin Corporation, Honda Motor Co., Ltd.Inventors: Shigeru Muto, Akira Sato, Kohya Shimano, Norio Tamate, Tomoyuki Honda, Takuji Yamamoto, Kazuhisa Yamamoto, Takatoshi Ota, Hiroshi Ikeba
-
Patent number: 7324758Abstract: An optical dispersion monitoring apparatus and an optical dispersion monitoring method are capable of monitoring dispersion accurately with a simple construction in an optical transmission system using the same. To this end, the optical dispersion monitoring apparatus includes a light receiving section converting an input optical signal into an electrical signal, a signal transition position detecting section detecting the voltage level of a waveform of the output signal from the light receiving section, at a crossing point of a rising edge and a falling edge, and a cumulative dispersion information extracting section comparing the voltage level at the crossing point with a reference signal to extracts cumulative dispersion information.Type: GrantFiled: November 20, 2003Date of Patent: January 29, 2008Assignee: Fujitsu LimitedInventors: Masazumi Marutani, Takuji Yamamoto
-
Patent number: 7132561Abstract: An object of the invention is to provide a process for industrially producing fluorinated dicyanobenzenes using tetrachlorodicyanobenzene as a raw material. According to the present invention, fluorinated dicyanobenzene can be produced in a high yield by allowing tetrachlorodicyanobenzenes to react with a fluorinating agent in the presence of a non-protonic polar solvent in an amount of 0.1 to 3 times by mass based on the tetrachlorodicyanobenzene. Further, the above production can be conducted more efficiently by reacting while disintegrating or removing bulk solid matters.Type: GrantFiled: October 3, 2001Date of Patent: November 7, 2006Assignee: Showa Denko K.K.Inventors: Toru Sasaki, Tetsuhiro Furukawa, Yoshinori Sato, Takuji Yamamoto, Takashi Yoneyama
-
Patent number: 7119617Abstract: A differential amplifier suitably adapted to an ultra-high-speed signal transmitting apparatus. The differential amplifier includes a first inductor located between a differential transistor and a gate grounded transistor, an optional second inductor located between a load resistor and a power supply, and an optional third inductor located between a source follower transistor and an output terminal.Type: GrantFiled: August 9, 2004Date of Patent: October 10, 2006Assignee: Fujitsu LimitedInventors: Hiroyuki Rokugawa, Takuji Yamamoto
-
Publication number: 20060078474Abstract: The present invention provides a sample breaking-up instrument and a method thereof, in which a pressing member is pressed by a centrifugal force against a sample within a cylindrical body provided with a filter member to thereby break-up the sample safely and efficiently. Provided is an instrument for breaking-up a sample, comprising: a cylindrical body having a through hole opening in both ends thereof; a filter member installed in one end of said cylindrical body within said through hole; and a pressing member to be operatively inserted into said hole of said cylindrical body from the other end thereof so as to be slidable therethrough in a sealed manner, wherein a force is exerted on said pressing member so that said pressing member presses said sample placed between said pressing member and said filter member against said filter member and thereby said sample is forced to pass through said filter member and is thus broken-up.Type: ApplicationFiled: December 17, 2004Publication date: April 13, 2006Applicant: Nippi, Inc.Inventors: Takuji Yamamoto, Yuko Ushiki, Shunji Hattori, Shinkichi Irie
-
Patent number: 7027741Abstract: According to a PLL circuit of the present invention, an output of a phase comparator is adjusted according to a space-to-mark transition-probability of an input signal so that an output of a voltage controlled oscillator has a predetermined frequency and phase. Therefore, even when a phase of a timing clock is set other than at 0, an output of the PLL circuit can be kept at the set phase, irrespective of the space-to-mark transition-probability. By using the PLL circuit as such in an optical communication apparatus and an optical communication system, a discrimination point can be kept almost fixed, and therefore, it is possible to lower an error rate.Type: GrantFiled: April 23, 2002Date of Patent: April 11, 2006Assignee: Fujitsu LimitedInventors: Masazumi Marutani, Takuji Yamamoto, Naoki Kuwata, Katsuya Yamashita
-
Publication number: 20060005996Abstract: In a method of attaching an electronic component to a printed circuit board by a plurality of screws that are inserted into corresponding through holes cut in the board from a surface of the board and then screwed into corresponding screw holes formed in the component mounted on an opposite surface, the component is screwed onto the board using one of the screws and the component and the screw are soldered onto the board with lead-free solder. After they have been cooled down, the component is screwed onto the board using remaining screws. With this, the strength of the connection between the component and board is improved and also the occurrence of warp of the board and component can be prevented.Type: ApplicationFiled: July 5, 2005Publication date: January 12, 2006Applicants: KEIHIN CORPORATION, HONDA MOTOR CO., LTD.Inventors: Shigeru Muto, Akira Sato, Kohya Shimano, Norio Tamate, Tomoyuki Honda, Takuji Yamamoto, Kazuhisa Yamamoto, Takatoshi Ota, Hiroshi Ikeba
-
Publication number: 20050104661Abstract: A differential amplifier suitably adapted to an ultra-high-speed signal transmitting apparatus. The differential amplifier includes a first inductor located between a differential transistor and a gate grounded transistor, an optional second inductor located between a load resistor and a power supply, and an optional third inductor located between a source follower transistor and an output terminal.Type: ApplicationFiled: August 9, 2004Publication date: May 19, 2005Inventors: Hiroyuki Rokugawa, Takuji Yamamoto
-
Patent number: 6878347Abstract: An exhaust gas purification system of an internal combustion engine having a bypass exhaust gas passage, openable through a switch-over valve, branched from an exhaust pipe at a location downstream of a catalytic converter and again merged into the exhaust pipe at a downstream point, an adsorbent installed in the bypass exhaust gas passage which adsorbs unburned component of the exhaust gas, and an EGR pipe which recirculates the exhaust gas including the unburned components at a location upstream of the catalytic converter, wherein the EGR pipe is made of metal such as stainless steel and is connected to the bypass exhaust gas passage such that the recirculation pipe is brought into thermal contact with the exhaust pipe, thereby enabling to effectively prevent blocking or corrosion of the EGR pipe or switch-over valve from occurring. The inner wall of the recirculation pipe is formed with liquid repellent and oil repellent film so as to overcome moisture-related problems more effectively.Type: GrantFiled: January 18, 2001Date of Patent: April 12, 2005Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Takashi Haga, Tadashi Satoh, Hideharu Yamazaki, Takuji Yamamoto
-
Publication number: 20040105684Abstract: An object of the invention is to provide an optical dispersion monitoring apparatus and an optical dispersion monitoring method, capable of monitoring dispersion accurately with a simple construction, and to an optical transmission system using the same. To this end, the optical dispersion monitoring apparatus comprises: a light receiving section converting an input optical signal into an electrical signal, a signal transition position detecting section detecting the voltage level of a waveform of the output signal from the light receiving section, at a crossing point of a rising edge and a failing edge, and a cumulative dispersion information extracting section comparing the voltage level at the crossing point with a reference signal to extracts cumulative dispersion information.Type: ApplicationFiled: November 20, 2003Publication date: June 3, 2004Applicant: Fujitsu LimitedInventors: Masazumi Marutani, Takuji Yamamoto
-
Publication number: 20040062336Abstract: The invention concerns an optical transmitter and receiver, and provides an improved timing extraction circuit for use in an optical receiver that uses a clock of a frequency equal to one half the data transmission rate, and a duty cycle deviation handling circuit for use in the optical transmitter and receiver. The timing extraction circuit uses a PLL circuit containing a phase comparator circuit for performing a phase comparison between a data signal of bit rate B (bits/s) and a clock signal of B/2 (Hz) at intervals of 2/B (sec), and comprises: a detection circuit for detecting the absence of an output of phase comparison information from the phase comparator circuit by receiving a data signal of a prescribed pattern; and a control circuit for controlling, upon detecting the absence, the phase of the clock signal in order to maintain synchronization.Type: ApplicationFiled: August 18, 2003Publication date: April 1, 2004Applicant: FUJITSU LIMITED.Inventors: Naoki Kuwata, Takuji Yamamoto
-
Publication number: 20040030173Abstract: An object of the invention is to provide a process for industrially producing fluorinated dicyanobenzenes using tetrachlorodicyanobenzene as a raw material.Type: ApplicationFiled: April 4, 2003Publication date: February 12, 2004Inventors: Toru Sasaki, Tetsuhira Furukawa, Yoshinori Sato, Takuji Yamamoto, Takashi Yoneyama
-
Patent number: 6609506Abstract: A recirculation exhaust gas extracted from the exhaust passage of an internal combustion engine and flowing through a recirculation passage. A recirculation control valve (6) controls the flow of the recirculation exhaust gas in the recirculation passage. A recirculation pipe (7) forming the recirculation passage has a hot or contact section (7c, 7e) extending near and along an exhaust manifold (1). The recirculation pipe (7) and the exhaust manifold (1) are covered with a heat-insulation cover (10). The drop of the temperature of the recirculation exhaust gas flowing through the recirculation passage is suppressed and the deposition of deposits including carbon in the recirculation control valve (6) is suppressed.Type: GrantFiled: June 28, 2001Date of Patent: August 26, 2003Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Hiromi Matsuura, Kazuhiro Takashiba, Takahiro Shinkai, Takuji Yamamoto
-
Patent number: D616226Type: GrantFiled: December 2, 2009Date of Patent: May 25, 2010Assignee: Atlantic Representations, Inc.Inventors: Wayne Calco, Takuji Yamamoto