Patents by Inventor Ryouzou Yoshino
Ryouzou Yoshino 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: 6831378Abstract: In a semiconductor integrated circuit device and a contactless electronic device, an AC voltage is applied to first and second input terminals. A rectification transistor having a drain (or collector) connected to a second input terminal and gate (or base) and drain (or collector) connected to each other through a first resistor supplies a rectified current between the first and second input terminals. A first voltage detector means produces a control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to a predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor. Such a power supply circuit is mounted in the contactless electronic device.Type: GrantFiled: October 29, 2002Date of Patent: December 14, 2004Assignees: Renesas Technology Corp., Hitachi ULSI Systems Co., Ltd.Inventors: Kazuki Watanabe, Ryouzou Yoshino, Norihisa Yamamoto, Hajime Kinota, Keiji Kamei
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Patent number: 6686750Abstract: A semiconductor integrated circuit device is provided with an IC chip so as to prevent its circuits from malfunction when the IC chip is cracked. To detect chip cracks, a resistor R01 is disposed at the outer periphery of the area in which one wants to detect the chip crack. If the chip is cracked and the resistance value of the resistor R01 is changed, the resistance change is detected, thereby controlling internal signals such as the power on reset signal and stopping the whole operation of the circuit device so as to prevent the circuits from malfunction. Thus, the system security can also be improved.Type: GrantFiled: June 10, 2002Date of Patent: February 3, 2004Assignee: Hitachi, Ltd.Inventors: Kazuki Watanabe, Ryouzou Yoshino, Kenji Nagai, Tatsuya Nishihara
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Patent number: 6608550Abstract: A reader and/or writer apparatus having an antenna lying substantially in a plane for generating an electromagnetic field to supply power to an IC card and a conductor member to be disposed in a plane substantially parallel to the plane of the antenna, wherein the distance between the antenna and the conductor member is no greater than 20 mm. A power supplying system supplies power using electromagnetic waves from the reader and/or writer apparatus to the IC card. The IC card includes a circuit for converting the supplied power to a D.C. voltage and for supplying the D.C. voltage to an internal circuit of the IC card.Type: GrantFiled: December 22, 2000Date of Patent: August 19, 2003Assignees: Hitachi, Ltd., Kokusai Electric Co., Ltd.Inventors: Yoshihiko Hayashi, Takashi Suga, Kouichi Uesaka, Ryouzou Yoshino, Keisuke Igarashi
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Publication number: 20030048653Abstract: In a semiconductor integrated circuit device and a contactless electronic device, an AC voltage is applied to first and second input terminals. A rectification transistor having a drain (or collector) connected to a second input terminal and gate (or base) and drain (or collector) connected to each other through a first resistor supplies a rectified current between the first and second input terminals. A first voltage detector means produces a control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to a predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor. Such a power supply circuit is mounted in the contactless electronic device.Type: ApplicationFiled: October 29, 2002Publication date: March 13, 2003Inventors: Kazuki Watanabe, Ryouzou Yoshino, Norihisa Yamamoto, Hajime Kinota, Keiji Kamei
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Patent number: 6487100Abstract: A semiconductor integrated circuit device and a contactless electronic device are provided with a power supply circuit producing a stable smooth voltage with high efficiency for stable operation of an inner circuit. An AC voltage is applied to first and second input terminals and a rectification transistor having drain (or collector) connected to second input terminal and gate (or base) and drain (or collector) connected to each other through resistor supplies a rectified current between the first and second input terminals. The first voltage detection means produces control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to the predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor means. Such power supply circuit is mounted in the contactless electronic device.Type: GrantFiled: March 20, 2001Date of Patent: November 26, 2002Assignee: Hitach, Ltd.Inventors: Kazuki Watanabe, Ryouzou Yoshino, Norihisa Yamamoto, Hajime Kinota, Keiji Kamei
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Publication number: 20020153899Abstract: A semiconductor integrated circuit device is provided with an IC chip so as to prevent its circuits from malfunction when the IC chip is cracked. To detect chip cracks, a resistor R01 is disposed at the outer periphery of the area in which one wants to detect the chip crack. If the chip is cracked and the resistance value of the resistor R01 is changed, the resistance change is detected, thereby controlling internal signals such as the power on reset signal and stopping the whole operation of the circuit device so as to prevent the circuits from malfunction. Thus, the system security can also be improved.Type: ApplicationFiled: June 10, 2002Publication date: October 24, 2002Applicant: Hitachi, Ltd.Inventors: Kazuki Watanabe, Ryouzou Yoshino, Kenji Nagai, Tatsuya Nishihara
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Patent number: 6427065Abstract: The present invention comprises a power transmission system, an IC card, and an information communication system using an IC card. In the power transmission system, power is transmitted by radio from the power transmission device to the IC card. In the IC card, the transmitted induced power is converted into a DC voltage, the transmitted induced power or a voltage corresponding to the induced power is detected, and a desired DC voltage to be suppled to the internal circuit is obtained in controlling resistance the detected induced power or the voltage corresponding to the induced power.Type: GrantFiled: August 16, 2000Date of Patent: July 30, 2002Assignee: Hitachi, Ltd.Inventors: Takashi Suga, Yoshihiko Hayashi, Ryouzou Yoshino, Kenji Nagai
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Patent number: 6420883Abstract: A semiconductor integrated circuit device provided with an IC chip so as to prevent its circuits from malfunction when the IC chip is cracked. To detect chip cracks, a resistor R01 is disposed at the outer periphery of the area which wants to detect the chip crack. If the chip is cracked and the resistance value of the resistor R01 is changed, the resistance change is detected, thereby controlling internal signals such as the power on reset signal and stopping the whole operation of the circuit device so as to prevent the circuits from malfunction. Thus, the system security can also be improved.Type: GrantFiled: October 27, 1999Date of Patent: July 16, 2002Assignee: Hitachi, Ltd.Inventors: Kazuki Watanabe, Ryouzou Yoshino, Kenji Nagai, Tatsuya Nishihara
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Patent number: 6321067Abstract: The present invention comprises a power transmission system, an IC card, and an information communication system using an IC card. In the power transmission system, power is transmitted by radio from the power transmission device to the IC card. In the IC card, the transmitted induced power is converted into a DC voltage, the transmitted induced power or a voltage corresponding to the induced power is detected, and a desired DC voltage to be suppled to the internal circuit is obtained in controlling resistance the detected induced power or the voltage corresponding to the induced power.Type: GrantFiled: September 15, 1997Date of Patent: November 20, 2001Assignee: Hitachi, Ltd.Inventors: Takashi Suga, Yoshihiko Hayashi, Ryouzou Yoshino, Kenji Nagai
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Publication number: 20010026186Abstract: A semiconductor integrated circuit device and a contactless electronic device are provided with a power supply circuit producing a stable smooth voltage with high efficiency for stable operation of an inner circuit. An AC voltage is applied to first and second input terminals and a rectification transistor having drain (or collector) connected to second input terminal and gate (or base) and drain (or collector) connected to each other through resistor supplies a rectified current between the first and second input terminals. The first voltage detection means produces control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to the predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor means. Such power supply circuit is mounted in the contactless electronic device.Type: ApplicationFiled: March 20, 2001Publication date: October 4, 2001Inventors: Kazuki Watanabe, Ryouzou Yoshino, Norihisa Yamamoto, Hajime Kinota, Keiji Kamei
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Publication number: 20010000659Abstract: A reader and/or writer apparatus having an antenna lying substantially in a plane for generating an electromagnetic field to supply power to an IC card and a conductor member to be disposed in a plane substantially parallel to the plane of the antenna, wherein the distance between the antenna and the conductor member is no greater than 20 mm. A power supplying system supplies power using electromagnetic waves from the reader and/or writer apparatus to the IC card. The IC card includes a circuit for converting the supplied power to a D.C. voltage and for supplying the D.C. voltage to an internal circuit of the IC card.Type: ApplicationFiled: December 22, 2000Publication date: May 3, 2001Inventors: Yoshihiko Hayashi, Takashi Suga, Kouichi Uesaka, Ryouzou Yoshino, Keisuke Igarashi
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Patent number: 6194993Abstract: A reader and/or writer apparatus, a power feeding system and a power feeding and communication transmission and/or reception system in a proximate wireless card system arranged so that power which satisfies the requirement of the Radio Law (500 &mgr;V/m at a distance of 3 m from the reader and/or writer apparatus) regarding the radiated electric field is supplied sufficiently from the reader and/or writer apparatus to the proximate wireless card (IC card). The reader and/or writer apparatus has a spirally shaped or coil-shaped antenna for generating electromagnetic fields both to supply operational power to an IC card and to perform transmission and/or reception of signals for communication to and/or from the IC card and a conductor member for forming a mirror image of the antenna on its back side.Type: GrantFiled: June 19, 1998Date of Patent: February 27, 2001Assignees: Hitachi, Ltd., Kokusai Electric Co., Ltd.Inventors: Yoshihiko Hayashi, Takashi Suga, Kouichi Uesaka, Ryouzou Yoshino, Keisuke Igarashi
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Patent number: 6173900Abstract: An object of the present invention is able to provide an IC card in which for example, even if a state should occur in which a plurality of IC cards are piled up in any direction for use, a received signal is not greatly lowered but a normal usage pattern is secured. When the IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped at least 15% or more of an area having an antenna to the other antenna surface on the projection surface and the IC card can work.Type: GrantFiled: October 27, 1999Date of Patent: January 16, 2001Assignee: Hitachi, Ltd.Inventors: Hiroshi Yoshigi, Takehiro Ookawa, Ryouzou Yoshino, Kimiaki Andou, Tadashi Oonishi, Koji Tsuru, Shin Kanno, Shigeru Date, Hisanobu Dobashi, Masahiro Sugiura
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Patent number: 5949823Abstract: An arrangement to realize the functions of a radio card system in which power is transmitted to perform data communication. According to such arrangement, a delay line and a clock regenerating circuit such as PLL circuit which are previously necessary for demodulation by PSK are not necessary, and thus functions of data communication are realized by minimum hardware construction, size, cost and power consumption. Further, in a data communication system in which electric power transmission using a signal of a frequency fp and digital data communication using a carrier wave of a frequency fs are performed by radio, fs and fp are in the relationship of fs=fp/N (where N is an integer) and a phase shift P when the phase of the carrier wave is modulated by PSK is (M.times.360.degree.)/N (where M, N are integers and P is preferably not equal to 180.degree.).Type: GrantFiled: September 12, 1997Date of Patent: September 7, 1999Assignee: Hitachi, Ltd.Inventors: Takashi Suga, Yoshihiko Hayashi, Ryouzou Yoshino, Kenji Nagai