Patents by Inventor Hiroyasu Muto

Hiroyasu Muto 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: 20190295802
    Abstract: In order to provide an ion beam apparatus excellent in safety and stability even when a sample is irradiated with hydrogen ions, the ion beam apparatus includes a vacuum chamber, a gas field ion source that is installed in the vacuum chamber and has an emitter tip, and gas supply means for supplying a gas to the emitter tip. The gas supply means includes a mixed gas chamber that is filled with a hydrogen gas and a gas for diluting the hydrogen gas below an explosive lower limit.
    Type: Application
    Filed: June 12, 2019
    Publication date: September 26, 2019
    Inventors: Hiroyasu SHICHI, Shinichi MATSUBARA, Yoshimi KAWANAMI, Hiroyuki MUTO
  • Patent number: 10366858
    Abstract: In order to provide an ion beam apparatus excellent in safety and stability even when a sample is irradiated with hydrogen ions, the ion beam apparatus includes a vacuum chamber, a gas field ion source that is installed in the vacuum chamber and has an emitter tip, and gas supply means for supplying a gas to the emitter tip. The gas supply means includes a mixed gas chamber that is filled with a hydrogen gas and a gas for diluting the hydrogen gas below an explosive lower limit.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: July 30, 2019
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Hiroyasu Shichi, Shinichi Matsubara, Yoshimi Kawanami, Hiroyuki Muto
  • Patent number: 7110182
    Abstract: To provide a glass sheet incorporating a plurality of optical elements, which incorporates a plurality of glass optical elements and realizes higher productivity and uniform quality of glass optical elements. The glass sheet incorporating a plurality of optical elements includes a plurality of lens parts formed by molding a glass material, reference surface areas each of which is formed around an outer periphery of each lens part and is horizontal to the lens part, and connection parts each of which extends from one reference surface area and connects one lens part to another lens part, in which the connection part has a margin for facilitating separation of the glass sheet into a plurality of pieces.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: September 19, 2006
    Assignee: Fujinon Corporation
    Inventors: Hiroyasu Muto, Katsunori Mukasa, Masaaki Fukuda, Yasuhiko Sato
  • Patent number: 7085078
    Abstract: A compound optical unit has combined optical elements in which two optical elements having convex optical functional surfaces are joined to each other with the optical functional surfaces facing each other, the optical elements being formed of glass. An inner flange adjacent to the optical functional surfaces of each optical element is different in thickness from an outer flange formed outsides the inner flange, the outer flange has a top face formed higher then the optical functional surface, and each of the top faces of the outer flanges are jointed to each other.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: August 1, 2006
    Assignee: Fujinon Corporation
    Inventors: Hiroyasu Muto, Hiroaki Fujita, Yasuhiko Sato
  • Publication number: 20050152047
    Abstract: A compound optical unit has combined optical elements in which two optical elements having convex optical functional surfaces are joined to each other with the optical functional surfaces facing each other, the optical element being formed of glass. An inner flange adjacent to the optical functional surfaces of each optical element is different in thickness from an outer flange formed outsides the inner flange, the outer flange has a top face formed higher then the optical functional surface, and each of the top faces of the outer flanges are jointed to each other.
    Type: Application
    Filed: January 13, 2005
    Publication date: July 14, 2005
    Applicant: Fujinon Corporation
    Inventors: Hiroyasu Muto, Hiroaki Fujita, Yasuhiko Sato
  • Patent number: 6822803
    Abstract: The present invention relates to an optical component in which a plurality of glass optical elements are integrated thus improving the productivity and providing consistent quality. The optical component of the present invention comprises a plurality of lens parts 1 which is formed from glass material by press molding, a tubular leg part 2 which is formed during the press molding, and which bends at and extends downward from the periphery of the lens part 1, a planar part 3 which bends outwardly and extends horizontally from the tubular leg part 2 providing connection to other lens parts 1, and the cover glass 4 of the image sensor chip 5, which is fixed onto the lower surface of the planar part 3, and/or image sensor chip 5 which is disposed below the lens part 1.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: November 23, 2004
    Assignee: Fuji Photo Optical Co., Ltd.
    Inventors: Hiroyasu Muto, Katsunori Mukasa, Masaaki Fukuda, Yasuhiko Sato
  • Publication number: 20030184873
    Abstract: The present invention relates to an optical component in which a plurality of glass optical elements are integrated thus improving the productivity and providing consistent quality. The optical component of the present invention comprises a plurality of lens parts 1 which is formed from glass material by press molding, a tubular leg part 2 which is formed during the press molding, and which bends at and extends downward from the periphery of the lens part 1, a planar part 3 which bends outwardly and extends horizontally from the tubular leg part 2 providing connection to other lens parts 1, and the cover glass 4 of the image sensor chip 5, which is fixed onto the lower surface of the planar part 3, and/or image sensor chip 5 which is disposed below the lens part 1.
    Type: Application
    Filed: March 11, 2003
    Publication date: October 2, 2003
    Applicant: Fuji Photo Optical Co., Ltd.
    Inventors: Hiroyasu Muto, Katsunori Mukasa, Masaaki Fukuda, Yasuhiko Sato
  • Publication number: 20030184872
    Abstract: To provide a glass sheet incorporating a plurality of optical elements, which incorporates a plurality of glass optical elements and realizes higher productivity and uniform quality of glass optical elements. The glass sheet incorporating a plurality of optical elements includes a plurality of lens parts formed by molding a glass material, reference surface areas each of which is formed around an outer periphery of each lens part and is horizontal to the lens part, and connection parts each of which extends from one reference surface area and connects one lens part to another lens part, in which the connection part has a margin for facilitating separation of the glass sheet into a plurality of pieces.
    Type: Application
    Filed: March 11, 2003
    Publication date: October 2, 2003
    Applicant: Fuji Photo Optical Co., Ltd.
    Inventors: Hiroyasu Muto, Katsunori Mukasa, Masaaki Fukuda, Yasuhiko Sato
  • Patent number: 6044117
    Abstract: In order to clip the levels of an incoming in-phase and quadrature signals, a comparator receives the in-phase signal, a clipping level, and an inverted clipping level. The comparator compares the level of the in-phase signal with each of the clipping level and the inverted clipping level, and generates a comparison result. A selector, in response to the comparison result, allows the in-phase signal to pass therethrough when the level of the in-phase signal exceeds the inverted clipping level and less than the clipping level, selecting the inverted clipping level when the level of the in-phase signal is less than the inverted clipping level, and selecting the clipping level when the level of the in-phase signal exceeds the clipping level. On the other hand, the level of the quadrature signal is limited using another comparator and selector in exactly the same manner as mentioned above.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: March 28, 2000
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5933424
    Abstract: In a transmitter in a CDMA system, a plurality of pilot signals which are identical with each other are sent in a base band region from a plurality of pilot signal generators to be supplied to a plurality of multipliers which are given signal ratios from a monitor/control unit and to be combined together through the multipliers. The signal ratios are varied by the monitor/control unit so that an amplitude of the combined pilot signal is kept constant even when one or more pilot signal generators are faulty.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: August 3, 1999
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5630218
    Abstract: Received signals are converted into IF signals by a frequency converter. The IF signals are caused to pass through a band-pass filter having a pass band width including a receiving channel and adjacent channels of higher- and lower-frequencies. The resultant signals are then converted into digital signals by an A/D converter. The digital signals are stored in a memory. The pass band of a variable frequency digital filter serving as a digital processing circuit is sequentially switched to the receiving channel and the adjacent channels, and the received signal data stored in the memory are read out and caused to pass through the variable frequency digital filter for each channel. The electric field levels of the received signals from the receiving channel and the adjacent channels are sequentially calculated by an electric field level measuring circuit by using outputs from the variable frequency digital filter or a demodulator connected to the output terminal of the filter.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: May 13, 1997
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5533068
    Abstract: Supplied with a transmitted signal defined by a sequence signal vectors each of which has a phase variation equal to a predetermined phase variation. A demodulator (11) quadrature demodulates a transmitted signal into a demodulated signal with reference to a standard signal of a standard frequency. The demodulated signal is defined by a sequence of demodulated vectors. An A/D section (21, 22) samples the demodulated vectors at a predetermined sampling rate to quantize the demodulated vectors into quantized vectors. A signal processor (31) compounds a composite vector from the quantized vectors within a predetermined number of the quantized vectors. The signal processor calculates a phase difference between the composite vector and a predetermined vector to detect a frequency error between the standard frequency and a carrier frequency of the transmitted signal.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: July 2, 1996
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5438691
    Abstract: In a receiver, a plurality of amplifiers each having a particular amplification factor amplifies a received signal. Analog-to-digital converters (ADCs) each converts the output of the respective amplifier to a digital value. The resulting digital values from the ADCs are written to respective memories. At the same time, maximum amplitude detectors respectively detect the maximum amplitudes of the associated digital values. A comparator locates, among the lines where the maximum amplitude of a burst does not reach either a positive saturation level or a negative saturation level, the line having a great amplification factor every time a burst appears. On receiving a control signal from the comparator, a selector transfers the digital value stored in the memory of the line selected to a signal processor. The signal processor demodulates and decodes the received signal based on the input digital value and delivers the output thereof to an output terminal.
    Type: Grant
    Filed: May 26, 1994
    Date of Patent: August 1, 1995
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5363414
    Abstract: A signal vector obtained by synchronous detection of a received signal is sampled by a sampling rate equal to a symbol rate. The sampled signal vector is rotated by a predetermined angle, and a mean value vector is calculated by latest rotated signal vectors of the number corresponding to a length of a particular signal sequence to be detected. Then, a square and summation value between the mean value and the rotated signal vector used for calculating the mean value vector is calculated. When the square and summation value becomes less than a predetermined value, a particular signal sequence is assumed to be detected.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: November 8, 1994
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5359628
    Abstract: In a channel impulse response estimator (12), a local preamble generator (35) generates a local preamble signal identical with a transmission preamble signal in a received signal. A preamble detector (37) detects the transmission preamble signal in an estimated sequence signal to produce a preamble detection signal. Responsive to the preamble detection signal, a sequence selector (39) selects one of the local preamble signal and the estimated sequence signal as a selected sequence signal which is supplied to a re-modulator (14). Responsive to the preamble detection signal, a step-size generator (41) generates one of first and second step-size signals as a selected step-size signal which is supplied to a tap coefficient producer (26).
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: October 25, 1994
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5157672
    Abstract: An apparatus comprising a Viterbi decoder which decodes received convolutional code data in accordance with the Viterbi algorithm and provides path metrics. Among the path metrics, a path metric comparator detects the maximum and minimum path metrics for each data symbol. The path metric comparator selects the minimum difference among differences between the maximum and minimum path metrics. An apparatus also comprises a field strength detector which detects the electromagnetic field strength of a radio signal containing the convolutional code data. Upon the minimum path metric difference and the field strength, an interference detector checks if interference exists in the radio signal. The minimum path metric difference may be used for an antenna diversity system.
    Type: Grant
    Filed: March 14, 1990
    Date of Patent: October 20, 1992
    Assignee: NEC Corporation
    Inventors: Seiji Kondou, Yoshihisa Isoda, Hiroyasu Muto
  • Patent number: 5146223
    Abstract: The offset from the ideal value for the bias voltage to be added to the input signal to the A/D converter and the offset from the ideal value of the average voltage in the analog signal are detected. The detected offset is substracted from the output data of the A/D converter. Alternately, the bias voltage may be changed by the detected offset so that the average voltage of the input signal to the A/D converter is equal to the ideal value.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: September 8, 1992
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5113415
    Abstract: A particular signal sequence corresponding in a received signal to a symbol pattern consisting of a predetermined number of symbols at a symbol interval, is detected by sampling (45-48) into phase samples substantially at the symbol interval of a phase of a signal vector obtained by coherent detection (11) of the received signal, calculation (51-52) of phase differences, each between two consecutive phase differences, detection (56-57) of consecutive instances of coincidence of each phase difference substantially with a predetermined phase difference, and determination (58-60) of presence of the signal sequence in the received signal when the instances of coincidence substantially reach in number to the predetermined number. Preferably, the sampling is carried out my making (11) I and Q signals represent the phase and converting (46-48) and I and Q signals to the phase samples by using a clock generator (45).
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: May 12, 1992
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5079512
    Abstract: An angular modulated signal is quadrature demodulated (37) into first and second signal vectors by a local carrier signal (36) having a frequency difference from a received carrier signal which is angular modulated by a modulating signal comprising symbols representative of binary one and zero at a symbol interval. In the modulating signal, a particular symbol sequence comprises the symbols in a predetermined manner and results in the first signal vector. A data symbol sequence comprises the symbols to represent data and results in the second signal vector. The first signal vector has inphase and quadrature phase amplitudes which are converted (41) to phase values substantially at the symbol interval. An individual error is provided by comparing (44) a phase variation between two phase values (42-43) with a reference variation (45) determined by the predetermined manner. Such individual errors are averaged (46) into a phase error (47) which is used in correcting (39) the second signal vector.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: January 7, 1992
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto
  • Patent number: 5065411
    Abstract: A diversity system comprising two receiving branches for receiving a radio signal including a data signal portion and a training signal portion propagating through a multipath, wherein, in each branch, a transmission property of a propagating path thereto is estimated from the training signal portion received, the transmission property comprising components significant to an equalizer and the remaining insignificant components, a blanch selectors selects, as a selected branch, a specific one of the branches providing the maximum value of a power ratio of the significant components to the insignificant components, and the equalizer equalizes the data signal portion received at the selected branch to produce an equalized signal as a resultant signal of the system.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: November 12, 1991
    Assignee: NEC Corporation
    Inventor: Hiroyasu Muto