Patents by Inventor Masahiro Kuwabara
Masahiro Kuwabara 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).
-
Patent number: 7158541Abstract: A receiver device for a packet communication system receives a packet signal appended at its head with a known number (N) of repetition signals. A correlation value of a received signal is outputted from a normalizing correlator and compared with a threshold value in a comparator. The output of the comparator is inputted to a synchronization signal generating circuit, which includes M (?N?1) delay elements connected in series and an AND circuit for taking the logical product of the outputs of the delay elements. When the output of the comparator is high-level and the outputs of the M delay elements 431 are also all high-level, a synchronization signal at symbol timing is outputted from the AND circuit.Type: GrantFiled: February 23, 2001Date of Patent: January 2, 2007Assignee: DENSO CorporationInventors: Manabu Sawada, Masahiro Kuwabara
-
Patent number: 7136426Abstract: A vehicle-vehicle communication system includes an in-vehicle wire LAN established in a vehicle. The in-vehicle wire LAN includes a plurality of devices connected by optical fiber links. A terminal for radio vehicle-vehicle communication is connected to the in-vehicle wire LAN by the optical fiber link. The terminal receives an optical digital signal in a predetermined format from the in-vehicle wire LAN. The terminal includes a light controlled oscillator and applies the received optical signal to the light controlled oscillator. The light controlled oscillator outputs a transmission signal of a frequency shifted from a predetermined frequency according to the intensity of the applied optical signal. Thus the terminal generates the transmission signal using FSK-modulation technique without converting the format of the optical signal into another format. The transmission signal is transmitted to a device in another vehicle via radio waves.Type: GrantFiled: December 18, 2001Date of Patent: November 14, 2006Assignees: Denso Corporation, National Institute of Information and Communications TechnologyInventors: Minoru Okada, Yutaka Aoki, Manabu Sawada, Masahiro Kuwabara, Hiroshi Harada, Masayuki Fujise
-
Patent number: 7099265Abstract: A diversity OFDM communication is performed between a base terminal and a mobile terminal, both having a horizontal polarization antenna and a vertical polarization antenna forming two transmission channels. In the base terminal, data signals to be transmitted are divided into two channels to transmit the data signals through either one of the channels having a higher transmission performance for each sub-carrier. Common pilot signals are transmitted through both channels. The data signals received by the mobile terminal are phase-adjusted using the common pilot signals. The phase-adjusted data signals in both channels are synthesized and then demodulated.Type: GrantFiled: June 1, 2001Date of Patent: August 29, 2006Assignee: DENSO CorporationInventors: Masahiro Kuwabara, Manabu Sawada, Kunihiko Sasaki
-
Patent number: 7088683Abstract: Communication between a stationary terminal such as an on-road terminal and a mobile terminal mounted on an automotive vehicle is performed under an OFDM system. Before transmitting data signals from the mobile terminal to the stationary terminal, a control signal indicating the number of sub-carries used in the data transmission is sent to the stationary terminal. The number of sub-carriers is decreased in accordance with increase of the moving speed to avoid deterioration in communication quality due to the moving speed increase. A modification formula and/or an error-correction-code coding rate used in the data transmission may be varied according to the moving speed in place of or together with varying the number of sub-carriers.Type: GrantFiled: June 19, 2001Date of Patent: August 8, 2006Assignee: DENSO CorporationInventors: Manabu Sawada, Masahiro Kuwabara
-
Publication number: 20060043622Abstract: A ratio of a length of resin flow-in to a radius of an optical component is not larger than 0.25, and gas is blown directly against a laser irradiated part radially and diagonally downward from an upside position corresponding to a center of the optical component. A laser line beam having longer sides extending in a direction along an inner wall is cast by a laser radiation device while being moved in the direction of the longer sides.Type: ApplicationFiled: April 5, 2005Publication date: March 2, 2006Inventors: Seiji Kumazawa, Yohei Takechi, Masahiro Kuwabara, Toshiyuki Okada, Masami Ito, Koji Funami, Yosuke Kawahito
-
Patent number: 7003301Abstract: A Micro-cell is formed to include a plurality of spot-cells. Communication is executed between a micro-cell base station and a mobile terminal in the micro-cell, and between a spot-cell base station and the mobile terminal in the spot cell. The micro-cell base station and spot-cell base stations are connected to an integrated base station. A signal transmitted to the micro-cell base station from the mobile terminal is transferred to the integrated base station and information transmitted to the mobile terminal is transferred to the micro-cell base station and/or spot-cell base station from the integrated base station. The respective integrated base stations are connected to a server via a dedicated backbone to enable a large-capacity transmission.Type: GrantFiled: September 17, 2001Date of Patent: February 21, 2006Assignees: Denso Corporation, National Institute of Information and Communications TechnologyInventors: Manabu Sawada, Masahiro Kuwabara, Yutaka Aoki, Minoru Okada, Hiroshi Harada, Masayuki Fujise
-
Patent number: 6954421Abstract: After the OFDM signal for MMAC is received by a receiving unit , an FFT processing unit converts such OFDM signal into the signal Y(l, k) in the frequency axis direction. A data extracting unit extracts a data signal Y(l, kd) and a pilot extracting unit extracts a pilot signal Y(l, kp). A complex dividing unit divides the extracted pilot signal with a pilot signal X(l, kp) having the identical amplitude and phase as that in the transmitting side. An interpolating unit performs a linear interpolation by using a transmission path response H(l, kp) of the pilot signal in order to calculate the transmission path estimation value H?(l, k) of the data signal. A complex dividing unit divides the extracted data signal with the transmission path estimation value of the data signal in order to calculate the data signal Y?(l, kd) that is compensated in the amplitude and phase.Type: GrantFiled: February 15, 2001Date of Patent: October 11, 2005Assignee: Denso CorporationInventors: Masahiro Kuwabara, Manabu Sawada
-
Patent number: 6892009Abstract: Positioned on a block is a filter for reflecting light ?1 and transmitting another light ?2. First and second light guides are positioned on the block in an aligned relation to each other so that their angled ends oppose to each other. An adhesive is applied to the angled ends of the light guides for holding a filter. Light ?2 is introduced in the light guides for adjusting the position of the light guides so that a predetermined amount of light is discharged from the light guide. A light receiver is positioned on the block through the adhesive and then light is introduced in the light guide for adjusting the position of the light receiver relative so that a predetermined amount of light is received by the light receiver. In particular, the adhesive has the same refractive index as the light guides.Type: GrantFiled: October 11, 2001Date of Patent: May 10, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masami Ito, Masahiro Kuwabara, Tomotaka Furuta
-
Publication number: 20040042728Abstract: Positioned on a block is a filter for reflecting light &lgr;1 and transmitting another light &lgr;2. First and second light guides are positioned on the block in an aligned relation to each other so that their angled ends oppose to each other. An adhesive is applied to the angled ends of the light guides for holding a filter. Light &lgr;2 is introduced in the light guides for adjusting the position of the light guides so that a predetermined amount of light is discharged from the light guide. A light receiver is positioned on the block through the adhesive and then light is introduced in the light guide for adjusting the position of the light receiver relative so that a predetermined amount of light is received by the light receiver. In particular, the adhesive has the same refractive index as the light guides.Type: ApplicationFiled: April 10, 2003Publication date: March 4, 2004Inventors: Masami Ito, Masahiro Kuwabara, Tomotaka Furuta
-
Publication number: 20030095756Abstract: The present invention provides a one-core bidirectional optical transmitting/receiving module for wavelength multiplexing, which does not require optical waveguide fabricated with high precision and which has superb high frequency characteristics and has very low optical and electrical crosstalks and available at low cost. At the middle of an optical fiber 1 buried in a glass substrate 3, a light irradiating portion is provided, which has a wavelength selection filter 2 placed obliquely to the optical fiber. The light irradiating portion is fixed immediately above a backside entrance type photodetection element 4 mounted on a ceramic substrate 6 by flip-clip bonding, and only optical signals with specific wavelength are received. An optical fiber extra portion 7 between a photodetection unit and a light emitting unit has sufficient length, and an end of the optical fiber is optically coupled with the light emitting element.Type: ApplicationFiled: November 14, 2002Publication date: May 22, 2003Inventors: Hitomaro Tohgoh, Hiroaki Asano, Hiroo Uchiyama, Masaki Kobayashi, Hidehiko Negishi, Masami Ito, Masahiro Kuwabara
-
Publication number: 20020094035Abstract: A vehicle-vehicle communication system includes an in-vehicle wire LAN established in a vehicle. The in-vehicle wire LAN includes a plurality of devices connected by optical fiber links. A terminal for radio vehicle-vehicle communication is connected to the in-vehicle wire LAN by the optical fiber link. The terminal receives an optical digital signal in a predetermined format from the in-vehicle wire LAN. The terminal includes a light controlled oscillator and applies the received optical signal to the light controlled oscillator. The light controlled oscillator outputs a transmission signal of a frequency shifted from a predetermined frequency according to the intensity of the applied optical signal. Thus the terminal generates the transmission signal using FSK-modulation technique without converting the format of the optical signal into another format. The transmission signal is transmitted to a device in another vehicle via radio waves.Type: ApplicationFiled: December 18, 2001Publication date: July 18, 2002Inventors: Minoru Okada, Yutaka Aoki, Manabu Sawada, Masahiro Kuwabara, Hiroshi Harada, Masayuki Fujise
-
Publication number: 20020034950Abstract: A Micro-cell is formed to include a plurality of spot-cells. Communication is executed between a micro-cell base station and a mobile terminal in the micro-cell, and between a spot-cell base station and the mobile terminal in the spot cell. The micro-cell base station and spot-cell base stations are connected to an integrated base station. A signal transmitted to the micro-cell base station from the mobile terminal is transferred to the integrated base station and information transmitted to the mobile terminal is transferred to the micro-cell base station and/or spot-cell base station from the integrated base station. The respective integrated base stations are connected to a server via a dedicated backbone to enable a large-capacity transmission.Type: ApplicationFiled: September 17, 2001Publication date: March 21, 2002Inventors: Manabu Sawada, Masahiro Kuwabara, Yutaka Aoki, Minoru Okada, Hiroshi Harada, Masayuki Fujise
-
Publication number: 20020018483Abstract: A diversity OFDM communication is performed between a base terminal and a mobile terminal, both having a horizontal polarization antenna and a vertical polarization antenna forming two transmission channels. In the base terminal, data signals to be transmitted are divided into two channels to transmit the data signals through either one of the channels having a higher transmission performance for each sub-carrier. Common pilot signals are transmitted through both channels. The data signals received by the mobile terminal are phase-adjusted using the common pilot signals. The phase-adjusted data signals in both channels are synthesized and then demodulated.Type: ApplicationFiled: June 1, 2001Publication date: February 14, 2002Inventors: Masahiro Kuwabara, Manabu Sawada, Kunihiko Sasaki
-
Publication number: 20010055287Abstract: Communication between a stationary terminal such as an on-road terminal and a mobile terminal mounted on an automotive vehicle is performed under an OFDM system. Before transmitting data signals from the mobile terminal to the stationary terminal, a control signal indicating the number of sub-carries used in the data transmission is sent to the stationary terminal. The number of sub-carriers is decreased in accordance with increase of the moving speed to avoid deterioration in communication quality due to the moving speed increase. A modification formula and/or an error-correction-code coding rate used in the data transmission may be varied according to the moving speed in place of or together with varying the number of sub-carriers.Type: ApplicationFiled: June 19, 2001Publication date: December 27, 2001Inventors: Manabu Sawada, Masahiro Kuwabara
-
Publication number: 20010015988Abstract: A receiver device for a packet communication system receives a packet signal appended at its head with a known number (N) of repetition signals. A correlation value of a received signal is outputted from a normalizing correlator and compared with a threshold value in a comparator. The output of the comparator is inputted to a synchronization signal generating circuit, which includes M (≦N−1) delay elements connected in series and an AND circuit for taking the logical product of the outputs of the delay elements. When the output of the comparator is high-level and the outputs of the M delay elements 431 are also all high-level, a synchronization signal at symbol timing is outputted from the AND circuit.Type: ApplicationFiled: February 23, 2001Publication date: August 23, 2001Inventors: Manabu Sawada, Masahiro Kuwabara
-
Publication number: 20010015954Abstract: After the OFDM signal for MMAC is received by a receiving unit , an FFT processing unit converts such OFDM signal into the signal Y(l, k) in the frequency axis direction. A data extracting unit extracts a data signal Y(l, kd) and a pilot extracting unit extracts a pilot signal Y(l, kp). A complex dividing unit divides the extracted pilot signal with a pilot signal X(l, kp) having the identical amplitude and phase as that in the transmitting side. An interpolating unit performs a linear interpolation by using a transmission path response H(l, kp) of the pilot signal in order to calculate the transmission path estimation value H′(l, k) of the data signal. A complex dividing unit divides the extracted data signal with the transmission path estimation value of the data signal in order to calculate the data signal Y′(l, kd) that is compensated in the amplitude and phase.Type: ApplicationFiled: February 15, 2001Publication date: August 23, 2001Inventors: Masahiro Kuwabara, Manabu Sawada
-
Patent number: 5927040Abstract: An automobile window molding including a molding body to be installed in a clearance between a peripheral edge of a windshield and a peripheral wall of a window frame, and a seal lip which protrudes from the outside of the molding body and which elastically transforms to a curved shape in such a manner that a tip portion thereof contacts the peripheral wall of the window frame, the seal lip decreasing in thickness from a base portion to a middle portion thereof and having an elastically transformable portion of thin thickness formed between the base portion and the middle portion and increasing in thickness from the elastically transformable portion to the tip portion, the tip portion being formed in thick section.Type: GrantFiled: August 5, 1997Date of Patent: July 27, 1999Assignee: Toyota Jidosha Kabushiki KaishaInventor: Masahiro Kuwabara
-
Patent number: 5057585Abstract: Hydrophilic gelled crosslinked polymers comprising as an essential constituent monomer component a (meth)acrylate ester monomer having a fluorine-substituted hydrocarbon group containing at least three fluorine atoms grafted thereto. The fluorine-containing polymers have excellent oxygen permeability, water swellability, wearing comfort and contamination resistance.Type: GrantFiled: July 19, 1990Date of Patent: October 15, 1991Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tokinori Agou, Takeshi Sakashita, Tomoaki Shimoda, Masaru Sudo, Masahiro Kuwabara, Masahide Tanaka
-
Patent number: 4957985Abstract: Hydrophilic gelled crosslinked polymers comprising as an essential constituent monomer component a (meth)acrylate ester monomer having a fluorine-substituted hydrocarbon group containing at least three fluorine atoms grafted thereto. The fluorine-containing polymers have excellent oxygen permeability, water swellability, wearing comfort and contamination resistance.Type: GrantFiled: December 29, 1987Date of Patent: September 18, 1990Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Tokinori Agou, Takeshi Sakashita, Tomoaki Shimoda, Masaru Sudo, Masahiro Kuwabara, Masahide Tanaka