Patents by Inventor Kenichi Takahira

Kenichi Takahira 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: 8387113
    Abstract: An authenticating system according to the present invention has a characteristic structure of which an authenticating section 32 of a note type PC 10 and an authenticating section 42 of a battery 20 are directly connected through I/O ports 51 and 61, respectively. Thus, the authenticating system according to the present invention can be relatively easily accomplished using a conventional system. The present invention can be applied to a system that is composed of a plurality of electronic devices that perform an authenticating process.
    Type: Grant
    Filed: May 10, 2007
    Date of Patent: February 26, 2013
    Assignees: Sony Corporation, Renesas Technology Corp.
    Inventors: Hidetoshi Shimada, Norio Fujimori, Keiichi Komaki, Keisuke Koide, Tsuyoshi Ookubo, Kenichiro Kamijo, Daiki Yokoyama, Kenichi Takahira, Katsuhisa Tatsukawa
  • Publication number: 20090125979
    Abstract: An authenticating system according to the present invention has a characteristic structure of which an authenticating section 32 of a note type PC 10 and an authenticating section 42 of a battery 20 are directly connected through I/O ports 51 and 61, respectively. Thus, the authenticating system according to the present invention can be relatively easily accomplished using a conventional system. The present invention can be applied to a system that is composed of a plurality of electronic devices that perform an authenticating process.
    Type: Application
    Filed: May 10, 2007
    Publication date: May 14, 2009
    Applicant: Sony Corporation
    Inventors: Hidetoshi Shimada, Norio Fujimori, Keiichi Komaki, Keisuke Koide, Tsuyoshi Ookubo, Kenichiro Kamijo, Daiki Yokoyama, Kenichi Takahira, Katsuhisa Tatsukawa
  • Patent number: 5952713
    Abstract: A non-contact IC card and a method and apparatus for manufacturing the IC card. The IC card has a small thickness and is manufactured at a low cost, automatically. Electronic parts are mounted on a circuit pattern on a surface of a resin sheet. A filling resin covers the elcetronic parts and fills gaps between them. An electronically insulating plastic material on the filling resin wraps around the filling resin, contacting its side surfaces and saide surfaces of the resin sheet. The plastic material provides added protection to the electronic parts. In a method of manufacturing the non-contact IC card, the laminated structure of the resin sheet, filling resin, and plastic material is subjected to two sequential severing steps. In the first severing step, only the resin sheet and the filling resin are severed, generally in the shape of an IC card that is to be completed.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: September 14, 1999
    Inventors: Kenichi Takahira, Jun Ohbuchi, Yasuhiro Murasawa
  • Patent number: 5898738
    Abstract: A modulator used in an IC card reader/writer includes a phase variation detector for detecting a varying point of the phase of a modulated signal, a signal processing circuit for modifying the modulated signal for a half period at the phase varying point to have a frequency and amplitude twice those of the modulated signal, a first Miller integrator for integrating the modified signal to produce a triangular wave signal, and a second Miller integrator for integrating the triangular wave signal to produce a sinusoidal wave signal having a continuous phase. A demodulator used in the reader/writer includes a sync control circuit which controls a carrier sync signal generation circuit thereby to control the phase of a carrier sync signal in response to the discrimination as to whether the carrier sync signal is in lead-phase or lag-phase relative to the signal modulated based on binary phase shift keying (BPSK).
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: April 27, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshishige Nagata, Kenichi Takahira
  • Patent number: 5671254
    Abstract: A modulator used in an IC card reader/writer includes a phase variation detector for detecting a varying point of the phase of a modulated signal, a signal processing circuit for modifying the modulated signal for a half period at the phase varying point to have a frequency and amplitude twice those of the modulated signal, a first Miller integrator for integrating the modified signal to produce a triangular wave signal, and a second Miller integrator for integrating the triangular wave signal to produce a sinusoidal wave signal having a continuous phase. A demodulator used in the reader/writer includes a sync control circuit which controls a carrier sync signal generation circuit thereby to control the phase of a carrier sync signal in response to the discrimination as to whether the carrier sync signal is in lead-phase or lag-phase relative to the signal modulated based on binary phase shift keying (BPSK).
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: September 23, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshishige Nagata, Kenichi Takahira
  • Patent number: 5664157
    Abstract: An interface unit includes an interface controller for controlling a bidirectional signal relative to an external host computer, a communication controller for controlling data communication with a noncontact IC card according to an output signal sent from the host computer, and a memory accessible by both the interface controller and communication controller. A noncontact IC card is very useful because of its accessibility at a remote place. A connector of the noncontact IC card can be protected from mechanical damage. With the interface unit, the noncontact IC card can be accessed as quickly as a contact IC card is.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: September 2, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenichi Takahira, Koichi Hayamizu
  • Patent number: 5424527
    Abstract: A signal receiving coil in which an erroneous input of a signal due to an alternating magnetic field that has been accidentally generated is prevented. In this invention, a signal receiving coil includes a first spiral coil having a predetermined winding direction and a second spiral coil spaced from the first spiral coil. The second spiral coil is connected in series to the first spiral coil and has its winding direction opposite from that of the first spiral coil. The second spiral coil generates an induced electromotive force of substantially the same magnitude and opposite direction from the first spiral coil when both spiral coils are subjected to the same alternating magnetic field. When a change in a magnetic field is applied over the entire surface of the signal receiving coil, the induced electromotive forces generated by the two spiral coils cancel each other.
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: June 13, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenichi Takahira
  • Patent number: 5382778
    Abstract: A non-contact IC card include a data transmitting/receiving device, a memory, a CPU, a first determining device, a second determining device, and a stopping device. When the data transmitting/receiving device receives a request signal, the first determining device determines whether first system identification information stored in the memory agrees with second system identification information contained in the request signal. At the same time, the second determining device determines whether use of the IC card indicated by use authorization information stored in the memory is authorized. When the first and second system identification information do not agree or when the use authorization information indicates that use of the IC card is not authorized, the stopping device stops the operation of the CPU until the next request signal is received.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: January 17, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenichi Takahira, Toshiyuki Matsubara
  • Patent number: 5367149
    Abstract: An IC card according to the present invention includes data processing means for processing data; a memory for storing a personal identification number; a power-supply terminal to which a power-supply voltage is applied by an external unit; an input/output terminal for inputting data from and outputting data to the external unit; a voltage detecting circuit for detecting the power-supply voltage applied to the power-supply terminal from the external unit; and a check-processing circuit for verifying a personal identification number input from the external unit by comparison with a personal identification number stored in the memory in response to a command for verifying applied to the input/output terminal when the power-supply voltage detected in the voltage detecting circuit is at least equal to a threshold voltage and constantly responding that an identification error has occurred when the power-supply voltage detected in the voltage detecting circuit is lower than the threshold voltage.
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: November 22, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenichi Takahira
  • Patent number: 5337063
    Abstract: An antenna circuit for a non-contact IC card exchanges signals with an external device utilizing electromagnetic waves. The antenna circuit includes a coil and a capacitor connected to form a resonant circuit. The coil includes a main coil having a spiral conductive pattern disposed on a peripheral portion of a substrate and a plurality of adjusting patterns, each electrically connecting a portion of the conductive pattern corresponding to a desired number of turns of the main coil to an end of the main coil. The plurality of adjusting patterns are disconnected from the main coil, except for one adjusting pattern, to obtain a coil of desired inductance.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: August 9, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenichi Takahira
  • Patent number: 5321240
    Abstract: A non-contact IC card has a high mechanical strength with respect to bending and twisting, although thin, yet allows the mounting area of a circuit board to be effectively used. A highly rigid, electrically-conducting reinforcing frame is disposed on the outer edge of a circuit board to increase the mechanical strength of the card with respect to bending and twisting. Further, the reinforcing frame is electrically connected to conductor patterns of a spiral coil on the circuit board having an inductance L in an antenna circuit.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: June 14, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenichi Takahira
  • Patent number: 5286962
    Abstract: Disclosed herein is an IC card provided with means for generating a first signal indicating execution to a test program and a logic circuit for receiving the first signal and a second signal for commanding data writing in the prescribed region of the memory. The logic circuit allows output of the second signal during execution of the test program, and inhibits such output of the second signal ween an application program is executed. The IC card is so structured that a prescribed region of a memory is brought into read-only state during execution of an application program so that the IC card is identified with read data, thereby preventing fraudulent use of the IC card.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: February 15, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shuzo Fujioka, Kenichi Takahira
  • Patent number: 5220158
    Abstract: A non-contact IC card includes an antenna by which data is sent and received without contact, first and second demodulators that demodulate signals received by the antenna, interrupt device interrupts a current flow for operating the first demodulator, a control device selects one of the first and second demodulators via the interrupt device when the second demodulator is selected, data processing device processes data demodulated by the demodulator selected by the control device, a modulator modulates signals from the data processing device and outputs them to the antenna, and a battery supplies power to the respective devices.
    Type: Grant
    Filed: September 19, 1991
    Date of Patent: June 15, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenichi Takahira, Shuzo Fujioka
  • Patent number: 5191192
    Abstract: A non-contact type information card includes a modulating/demodulating circuit, an antenna circuit, a CPU, a RAM, and a clock signal generating circuit. In the non-contact type information card, when the modulating/demodulating circuit receives a new command signal, the CPU determines whether first and second identification information in the new command signal agrees with the first and second identification information in an old command signal. When the first and second identification information of the new command signal agree with that of the old command signal, the CPU stops the operation of the clock generating circuit until the next command signal is received.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: March 2, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenichi Takahira, Kazuo Asami
  • Patent number: 5182442
    Abstract: A noncontact IC card comprises a data transmit-receive circuit for transmitting and receiving data without contact, a detection circuit for detecting a trigger signal in a signal received by the data transmit-receive circuit, a data processing circuit connected to the data transmit-receive circuit for processing the data, a clock generating circuit for supplying a clock signal to the data processing circuit, an actuating circuit for actuating the clock generating circuit in response to the detection of the trigger signal by the detection circuit, and a battery for supplying electric power to each of the above circuits.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: January 26, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenichi Takahira
  • Patent number: 5157247
    Abstract: An IC card has a data transmission/receiving circuit for exchanging data with an external device, a data processing circuit connected to the data transmission/receiving circuit for processing the data, a battery for supplying the data transmission/receiving circuit and the data processing circuit with electrical power, a charge storage device such as a capacitor charged at a predetermined time constant by the battery, a charge control circuit for controlling connection of the battery to the charge storage device in accordance with a control signal from the data processing circuit, a comparator circuit for comparing the output voltage from the charge storage device with a reference value, and a time measuring counter for measuring the time from electrical connection of the battery to the charge storage device until the comparator circuit detects an output voltage from the charge storage circuit exceeding the reference value.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: October 20, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenichi Takahira
  • Patent number: 5056089
    Abstract: A memory system storing data detects and corrects an error in the stored data. The memory device includes a coding circuit for generating a systematic code including a data word and an error checking and correcting (ECC) code when the data word is supplied from a data bus during data writing, a memory cell array for storing the systematic code, and a sense amplifier for reading the systematic code from the memory cell. An error checking and correcting system generates a syndrome from the systematic code, decodes the syndrome to determine whether an error exists, identifies a bit position at which an error has occurred, and corrects the error contained in the data word by inverting a bit of the data word in the position at which the error has occured. The system includes a multiplexer for outputting the corrected data word to the data bus and a code reading circuit, for example, an ECC code register, for reading the ECC code generated by the coding circuit directly into the data bus.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: October 8, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shigeru Furuta, Kenichi Takahira, Atsuo Yamaguchi, Takesi Inoue, Toshiyuki Matsubara, Shuzo Fujioka
  • Patent number: 5047924
    Abstract: A microcomputer comprises EEPROM provided as a fixed storage unit and a CPU for controlling the operation of the EEPROM, in which the EEPROM contains a divider which divides a stable clock signal from the outside of the microcomputer and converts it to a clock signal with a desired frequency, the clock signal is used as a synchronizing signal necessary for the writing data into the EEPROM. The CPU controls the operation of the EEPROM and sets the dividing ratio of the divider contained in the EEPROM at a desired value in accordance with the assignment from the outside of the microcomputer.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: September 10, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shuzo Fujioka, Toshiyuki Matsubara, Atsuo Yamaguchi, Kenichi Takahira, Shigeru Furuta, Takesi Inoue
  • Patent number: 5036460
    Abstract: A microprocessor system including an EEPROM with a page mode writing function that prevents writing of erroneous data. The circuit includes a memory cell array divided into a plurality of pages each having a predetermined number of bytes, a data latch for latching bytes corresponding to a page, an exterior write control circuit which enables the data latch in response to a signal from the CPU to latch a sequence of bytes corresponding to a page, and an interior write control circuit which enables the memory cell array so that the bytes latched in the data latch are transferred therefrom to a page of the memory cell array. The exterior write control circuit includes a time measurement circuit and an interior write suppression circuit. The time measurement circuit measures the time which elapses from the initiation of the latching of bytes into the data latch, and outputs an overflow signal when the measured time exceeds a predetermined limit.
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: July 30, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenichi Takahira, Atsuo Yamaguchi, Shigeru Furuta, Takesi Inoue, Toshiyuki Matsubara, Shuzo Fujioka
  • Patent number: 5019970
    Abstract: An IC card includes an addressable CPU having a memory space including a special area including a first plurality of memory addresses which are addressable with a short instruction word, first and second memories in which test and application programs are stored, respectively, a bus which connects the CPU and the first and second memories, a first selection circuit for forming a first memory mapping arrangement in which at least a portion of the first memory is superimposed on the special area, a second selection circuit for forming a second memory mapping arrangement in which at least a portion of the second memory is superimposed on the special area, a detection circuit for detecting the execution of the test program or the application program, and a changeover circuit arranged to selectively operate the first and second selection circuits according to the result of detection executed by the detection circuit.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: May 28, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Atsuo Yamaguchi, Kenichi Takahira, Shigeru Furuta, Takesi Inoue, Toshiyuki Matsubara, Shuzo Fujioka