Patents by Inventor Hirokazu Fujiki

Hirokazu Fujiki 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: 5381345
    Abstract: A circuit layout pattern inspection method and a logical simulator for implementing the same. Wiring is substituted by a .pi. or T equivalent circuit and is described by a nodal equation, and a gate is described by a simplified model, that is, a current source calculation formula. By the nodal equation and the current source calculation formula, a simulation is performed to obtain a delay time for every node. The obtained delay time is stored to make the inspection easy.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: January 10, 1995
    Assignee: Rohm Co., Ltd.
    Inventors: Hiroshi Takegami, Makoto Morikawa, Hirokazu Fujiki
  • Patent number: 5359534
    Abstract: A logical circuit layout pattern verification method. Verification of a logical circuit layout pattern is performed by: adding the parasitic capacitance of a layout pattern of a logical circuit to a load capacitance of logic gates, calculating an output value of the logical circuit based on the total capacitance, and verifying the layout pattern by comparing the output value and the expected output value calculated at initial design. In the calculation of the delay time of the logic gate, the delay time corresponding to discrete representative values of the load capacitance are first calculated, the functions describing the relationship between the load capacitance and the delay time are calculated using the delay time, and based on the function, the delay time corresponding to the load capacitance having continuous values is calculated. With the method, malfunctioning of the circuit caused by delay time is predictable.
    Type: Grant
    Filed: January 22, 1992
    Date of Patent: October 25, 1994
    Assignee: Rohm Co., Ltd.
    Inventors: Hirokazu Fujiki, Makoto Morikawa
  • Patent number: 4608593
    Abstract: A color television camera apparatus wherein a video signal is adjusted by the steps of detecting adjustment data with respect to predetermined adjustment items from the video signal corresponding to the pattern of a test chart, comparing the adjustment data with reference data to obtain correcting data and supplying the correcting data to a video signal adjusting circuit. The correcting data is modified by variation data stored in a memory in advance and the modified correcting data is supplied to the video signal adjusting circuit. The difference between the video signals adjusted on the basis of the correcting data and the modified correcting data is then calculated and judgement is made as to whether the difference falls within a predetermined allowable range, whereby abnormality in the control system of the color television camera apparatus can be detected.
    Type: Grant
    Filed: November 9, 1983
    Date of Patent: August 26, 1986
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yoshimori Miyaji, Hirokazu Fujiki, Fumio Takahashi
  • Patent number: 4320414
    Abstract: Disclosed is an adjusting device for a television camera apparatus which comprises a signal processing circuit for processing a video signal, a data detecting circuit for detecting an adjusting data from the processed video signal from the signal processing circuit, and an arithmetically operating circuit for calculating a correcting data from a reference data and the adjusting data from the data detecting circuit. The correcting data is converted by a correction signal circuit into an analog correction signal. This signal is supplied to the signal processing circuit and also to a deflection circuit. The reference data and connecting data are stored in a memory section comprised of a Randum Access Memory and a non-volatile memory. Both such reference data and correcting data are stored, at the time of adjusting the camera apparatus, in the Randum Access Memory and, upon completion of such adjustment, is transferred from the Randum Access Memory to the non-volatile memory.
    Type: Grant
    Filed: April 8, 1980
    Date of Patent: March 16, 1982
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yoshimori Miyaji, Hirokazu Fujiki, Fumio Takahashi
  • Patent number: 4314272
    Abstract: Disclosure is an adjusting device for a television camera apparatus which comprises a signal processing circuit for processing a video signal, a data detecting circuit for detecting an adjusting data from the processed video signal from the signal processing circuit, and an arithmetically operating circuit for calculating a correcting data from a reference data and the adjusting data from the data detecting circuit. The correcting data is converted by a correction signal circuit into an analog correction signal. This signal is supplied to the signal processing circuit and also to a deflection circuit. The adjusting device further comprises a data input means for manually inputting manual correcting data used to correct the adjustment errors inherently occurring in the television camera apparatus. The manual correcting data from the data input means is added to a reference data, whereby a manual adjusting data is determined.
    Type: Grant
    Filed: April 8, 1980
    Date of Patent: February 2, 1982
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yoshimori Miyaji, Hirokazu Fujiki, Fumio Takahashi
  • Patent number: 4290038
    Abstract: A scanning-area rotation device for an image pickup tube has a coil (10) for rotating a scanning-area by an electron beam on the target surface of an image pickup tube (14), a shield ring (46) for electrostatically shielding the coil (10) from the target of the image pickup tube (14), and a shield cover (44) for magnetically shielding the coil (10). The shield ring (46) electrostatically shields the target and signal circuit connecting to the target from the coil (10), but does not shield a magnetic flux from the coil (10) to the target. The shield cover (44) shields a magnetic flux developed by the coil (10) and extending to the exterior of the cover (44).
    Type: Grant
    Filed: August 14, 1979
    Date of Patent: September 15, 1981
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Junichi Yamanaka, Noboru Nakamura, Hirokazu Fujiki, Yoshimori Miyaji
  • Patent number: 4035836
    Abstract: A prism optical system for a color television camera having first and second dichroic layers designed to split a light passing through the objective lens into three color light components adapted to enter the corresponding three pickup tubes, wherein the first dichroic layer is positioned nearer to the objective lens than the second dichroic layer to reflect at least a green light component and defines an angle of 30.degree. or less with a plane perpendicularly intersecting the axis of a nonreflecting light; a light reflected by the first dichroic layer is totally reflected by that prism surface of a first prism which faces the objective lens and is emitted outside of a prism system; the second dichroic layer defines an angle of 45.degree. or less with a plane perpendicularly intersecting the axis of a nonreflecting light; and a light reflected by the second dichroic layer is immediately emitted outside of the prism system.
    Type: Grant
    Filed: February 6, 1976
    Date of Patent: July 12, 1977
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Yoshimori Miyaji, Hirokazu Fujiki, Tamotsu Nishizawa, Naotake Morita