Patents by Inventor Masahiro Ohishi

Masahiro Ohishi 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: 20240087594
    Abstract: Provided is a technique for accurately estimating a scene even when the number of input signals increases. A scene estimation method includes: when S is the number of scenes and M is the number of input acoustic signals, an acoustic signal encoding step of generating, by a scene estimation device, an integrated acoustic feature amount from an m-th input acoustic signal (m=1, . . . , M) and a position where the m-th input acoustic signal is acquired (hereinafter referred to as an m-th input acoustic signal acquisition position) (m=1, . . . , M); and a scene selection step of selecting, by the scene estimation device, a scene from which M input acoustic signals are acquired from among S scenes, using the integrated acoustic feature amount.
    Type: Application
    Filed: February 10, 2021
    Publication date: March 14, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masahiro YASUDA, Yasunori OHISHI, Shoichiro SAITO
  • Publication number: 20230349695
    Abstract: In a surveying instrument including an instrument height measuring unit the instrument height measuring unit includes a light transmitting unit configured to emit light, a beam splitter configured to be incident with light emitted from the light transmitting unit, split the incident light into reference light and distance-measuring light, send the reference light to a reference light path, and send the distance-measuring light to a distance-measuring light path, a first light receiving unit configured to receive the reference light, a second light receiving unit configured to receive light being the distance-measuring light that has been emitted toward a position below the vertical axis of the surveying instrument main body and returned by being reflected by a distance-measuring object, and an arithmetic unit configured to calculate the instrument height based on a difference between light reception signals generated by the first light receiving unit and the second light receiving unit.
    Type: Application
    Filed: March 23, 2023
    Publication date: November 2, 2023
    Inventors: Masaho KIKUCHI, Masahiro OHISHI
  • Patent number: 10732267
    Abstract: An electro-optical distance meter comprises a light source for emitting a distance measuring light, a distance measuring optical system for leading a distance measuring light to a photodetector, an internal reference optical system for leading a part of the distance measuring light as an internal reference light to the photodetector, and an arithmetic processing unit for performing a distance measurement based on light receiving results of the distance measuring light and the internal reference light, wherein the internal reference optical system comprises a condenser lens, a scattering plate for scattering the internal reference light and for forming a secondary light source, and an optical fiber for leading the internal reference light to the photodetector and the internal reference optical system is constituted in such a manner that a light component of the internal reference light emitted from an arbitrary point within a whole surface of the secondary light source enters the optical fiber.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: August 4, 2020
    Assignee: TOPCON Corporation
    Inventors: Akinobu Sugiura, Masahiro Ohishi
  • Patent number: 10663296
    Abstract: Provided is a surveying instrument including a light emitting section for emitting distance measuring light having an intensity distribution in which an intensity is high at the center and it became lower as approaching the periphery, a light receiving section for receiving the distance measuring light via a measurement object; and a distance-measurement optical system for guiding the light to the light receiving section via the measurement object. The surveying instrument performs a prism-mode and non-prism-mode measurements. The optical system includes an aperture diaphragm arranged in a distance-measurement optical path during the prism-mode-measurement. An opening of the aperture diaphragm has widths of greater than 0 and not greater than 0.5 times the full width at half maximum of the intensity distribution in a cross-section of non-prism-distance-measurement beam in the horizontal and vertical direction.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: May 26, 2020
    Assignee: TOPCON CORPORATION
    Inventors: Akinobu Sugiura, Masahiro Ohishi
  • Publication number: 20180245917
    Abstract: Provided is a surveying instrument including a light emitting section for emitting distance measuring light having an intensity distribution in which an intensity is high at the center and it became lower as approaching the periphery, a light receiving section for receiving the distance measuring light via a measurement object; and a distance-measurement optical system for guiding the light to the light receiving section via the measurement object. The surveying instrument performs a prism-mode and non-prism-mode measurements. The optical system includes an aperture diaphragm arranged in a distance-measurement optical path during the prism-mode-measurement. An opening of the aperture diaphragm has widths of greater than 0 and not greater than 0.5 times the full width at half maximum of the intensity distribution in a cross-section of non-prism-distance-measurement beam in the horizontal and vertical direction.
    Type: Application
    Filed: January 24, 2018
    Publication date: August 30, 2018
    Inventors: Akinobu SUGIURA, Masahiro OHISHI
  • Publication number: 20180011177
    Abstract: An electro-optical distance meter comprises a light source for emitting a distance measuring light, a distance measuring optical system for leading a distance measuring light to a photodetector, an internal reference optical system for leading a part of the distance measuring light as an internal reference light to the photodetector, and an arithmetic processing unit for performing a distance measurement based on light receiving results of the distance measuring light and the internal reference light, wherein the internal reference optical system comprises a condenser lens, a scattering plate for scattering the internal reference light and for forming a secondary light source, and an optical fiber for leading the internal reference light to the photodetector and the internal reference optical system is constituted in such a manner that a light component of the internal reference light emitted from an arbitrary point within a whole surface of the secondary light source enters the optical fiber.
    Type: Application
    Filed: June 27, 2017
    Publication date: January 11, 2018
    Inventors: Akinobu Sugiura, Masahiro Ohishi
  • Patent number: 9161691
    Abstract: Provided is a scanning laser ophthalmoscope capable of accurately superposing multiple photographed images. The scanning laser ophthalmoscope comprises an image generating unit that generates first images based on the light reflected from first laser light and second images based on the light reflected from second laser light. An associating unit associates the first images and the second images based on the first laser light and the second laser light parallelly scanned by the scanning unit. A displacement calculating unit calculates displacements between images regarding multiple first images. The position matching unit matches the positions of multiple second images based on the processing results from the associating unit and the displacements. The superposing unit superposes the multiple second images that have undergone the position matching. The display unit displays an image obtained by superposing the multiple second images.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: October 20, 2015
    Assignee: KABUSHIKI KAISHA TOPCON
    Inventors: Masahiro Ohishi, Hitoshi Shimizu
  • Patent number: 8781780
    Abstract: The present invention provides an electro-optical distance measurement, wherein a light from a light source (6) is projected toward an object to be measured (2), a reflection light reflected by the object to be measured is received at a photodetection unit (8), the light from the light source is received by the photodetection unit as an inner light via an inner optical path (11), and a distance to the object to be measured is measured according to the result of photodetection of the reflection light and the inner light of the photodetection unit, and wherein a correction information is acquired based on the inner light, the acquired correction information is stored, a correction value is obtained from the correction information based on the reflection light and the inner light, and a distance is calculated from the correction value and the result of photodetection of the reflection light and the inner light.
    Type: Grant
    Filed: December 25, 2009
    Date of Patent: July 15, 2014
    Assignee: Kabushiki Kaisha TOPCON
    Inventors: Mitsuru Kanokogi, Masahiro Ohishi
  • Patent number: 8610880
    Abstract: A distance measuring apparatus and method that enable high-precision and high-speed measurement by canceling variations of a delay circuit in the apparatus are provided. Pulsed light is branched into first and second reference light, and transmitted measurement light, and the difference in detection time among the first reference light along a first path with no optical variations, the second reference light along a second path with an optical delay, and received measurement light from an object to be measured is measured. The received measurement light and the first reference light are temporally separate, distance is calculated from the difference in detection time between the received measurement light and the first reference light.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: December 17, 2013
    Assignee: Topcon Corporation
    Inventors: Masahiro Ohishi, Yoshikatsu Tokuda
  • Publication number: 20130242261
    Abstract: Provided is a scanning laser ophthalmoscope capable of accurately superposing multiple photographed images. The scanning laser ophthalmoscope comprises an image generating unit that generates first images based on the light reflected from first laser light and second images based on the light reflected from second laser light. An associating unit associates the first images and the second images based on the first laser light and the second laser light parallelly scanned by the scanning unit. A displacement calculating unit calculates displacements between images regarding multiple first images. The position matching unit matches the positions of multiple second images based on the processing results from the associating unit and the displacements. The superposing unit superposes the multiple second images that have undergone the position matching. The display unit displays an image obtained by superposing the multiple second images.
    Type: Application
    Filed: September 14, 2011
    Publication date: September 19, 2013
    Applicant: KABUSHIKI KAISHA TOPCON
    Inventors: Masahiro Ohishi, Hitoshi Shimizu
  • Patent number: 8179522
    Abstract: A distance measuring device measures a distance from a phase difference of beaten down processing signals even when fluctuations occur in a frequency of an oscillator. The distance measuring device includes a laser unit, a dividing device, a reference light receiving unit, and a measuring light receiving unit. The distance measuring device further includes an oscillator, a first mixer, a second mixer, a fourth filter, a fifth filter, a third mixer, a sixth filter, a second filter, a phase difference measuring unit, and a distance measuring unit. The phase difference measuring unit measures a phase difference of the two beat signals extracted by the sixth filter and the second filter. The distance measuring unit measures a distance based on the phase difference measured by the phase difference measuring unit.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: May 15, 2012
    Assignee: Kabushiki Kaisha Topcon
    Inventors: Isao Minegishi, Masahiro Ohishi, Naoto Miki, Yuichi Yoshimura
  • Publication number: 20120033197
    Abstract: A distance measuring device measures a distance from a phase difference of beaten down processing signals even when fluctuations occur in a frequency of an oscillator. The distance measuring device includes a laser unit, a dividing device, a reference light receiving unit, and a measuring light receiving unit. The distance measuring device further includes an oscillator, a first mixer, a second mixer, a fourth filter, a fifth filter, a third mixer, a sixth filter, a second filter, a phase difference measuring unit, and a distance measuring unit. The phase difference measuring unit measures a phase difference of the two beat signals extracted by the sixth filter and the second filter. The distance measuring unit measures a distance based on the phase difference measured by the phase difference measuring unit.
    Type: Application
    Filed: September 1, 2011
    Publication date: February 9, 2012
    Inventors: Isao Minegishi, Masahiro Ohishi, Naoto Miki, Yuichi Yoshimura
  • Publication number: 20110310377
    Abstract: A distance measuring apparatus and a distance measuring method that enable high-precision and high-speed measurement by canceling variations of a delay circuit in the distance measuring apparatus are provided. In the apparatus and the method, light emitted by a light source section 10 in a pulsed manner is branched into first reference light r1, second reference light r2, and transmitted measurement light mt, and the difference in detection time among the first reference light r1 having propagated through a first reference light path R1 which causes substantially no optical variations, the second reference light r2 having propagated through a second reference light path in which an optical delay generating section 50 is inserted, and received measurement light mr returning from an object to be measured 160 as a result of radiating the transmitted measurement light to the object to be measured 160 is measured to measure the distance from the object to be measured 160.
    Type: Application
    Filed: December 18, 2009
    Publication date: December 22, 2011
    Inventors: Masahiro Ohishi, Yoshikatsu Tokuda
  • Publication number: 20110270563
    Abstract: The present invention provides an electro-optical distance measurement, wherein a light from a light source (6) is projected toward an object to be measured (2), a reflection light reflected by the object to be measured is received at a photodetection unit (8), the light from the light source is received by the photodetection unit as an inner light via an inner optical path (11), and a distance to the object to be measured is measured according to the result of photodetection of the reflection light and the inner light of the photodetection unit, and wherein a correction information is acquired based on the inner light, the acquired correction information is stored, a correction value is obtained from the correction information based on the reflection light and the inner light, and a distance is calculated from the correction value and the result of photodetection of the reflection light and the inner light.
    Type: Application
    Filed: December 25, 2009
    Publication date: November 3, 2011
    Applicant: KABUSHIKI KAISHA TOPCON
    Inventors: Mitsuru Kanokogi, Masahiro Ohishi
  • Patent number: 7945821
    Abstract: In measuring a certain time lag between generations of two pulse signals, a time lag measuring device prevents errors in measurement results even with an error in two reference signals for measuring the time lag. The device measures a time lag between a start signal M1 and a stop signal M2 and includes a reference signal generating section 41 generating two reference signals S1, S2 having a phase difference ?/2, and an amplitude detecting section 42 detects amplitudes A11, A12 and A21, A22 of the reference signals S1, S2 at generation timings for the start signal M1 and the stop signal M2, a phase difference detecting section 43 calculating a phase _ of the reference signals S according to each set of the amplitudes (A11, A12) and (A21, A22), and a correcting section 46 correcting the calculated phase using correction data for error correction in the reference signals S1, S2.
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: May 17, 2011
    Assignee: Kabushiki Kaisha TOPCON
    Inventors: Masahiro Ohishi, Yoshikatsu Tokuda, Fumio Ohtomo
  • Patent number: 7903235
    Abstract: A surveying instrument and a surveying method for further minimizing a measurement error when the surveying instrument casts a light to a measuring object and receives the reflected light and measures a delay time or a distance. A reference pulse light r and a measurement pulse light o1 are received as a received light signal by a light receiving section 9, and a damping signal S3U is formed from the received light signals r, o1, and an amplification rate of a minute level signal in the proximity of a zero cross point Q0 of the damping signal S3U is greatly amplified, and timing signals r?, o1? are formed by using an amplified signal. Therefore, the measurement error can be minimized.
    Type: Grant
    Filed: August 10, 2006
    Date of Patent: March 8, 2011
    Assignee: Topcon Corporation
    Inventors: Masahiro Ohishi, Isao Minegishi
  • Patent number: 7849371
    Abstract: In measuring a certain time lag between generations of two pulse signals, a time lag measuring device prevents errors in measurement results even with an error in two reference signals for measuring the time lag. The device measures a time lag between a start signal M1 and a stop signal M2 and includes a reference signal generating section 41 generating two reference signals S1, S2 having a phase difference ?/2, and an amplitude detecting section 42 detects amplitudes A11, A12 and A21, A22 of the reference signals S1, S2 at generation timings for the start signal M1 and the stop signal M2, a phase difference detecting section 43 calculating a phase _ of the reference signals S according to each set of the amplitudes (A11, A12) and (A21, A22), and a correcting section 46 correcting the calculated phase using correction data for error correction in the reference signals S1, S2.
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: December 7, 2010
    Assignee: Kabushiki Kaisha Topcon
    Inventors: Masahiro Ohishi, Yoshikatsu Tokuda, Fumio Ohtomo
  • Patent number: 7777865
    Abstract: A time difference measuring device can accurately measure a time difference between two pulse signals generated with a predetermined time difference by measuring the two pulse signals by one measurement. The time difference measuring device measures a time difference between a start signal (M1) and a stop signal (M2). The device has a reference signal generation unit (41) for generating two reference signals (S1, S2) having a ?/2 phase difference. According to corresponding amplitude values (A11, A12) and (A21, A22) of the reference signals (S1, S2) at each generation timing of the start signal (M1) and the stop signal (M2), a phase difference detection unit (42) calculates a phase difference ?? (=?stop??start) between the generation timings of the pulse signals (M1, M2). According to the detected phase difference ?? and the cycle (Ts) of the reference signals (S1; S2), a time difference calculation unit (44) calculates the generation time difference ?t between the pulse signals (m1, M2).
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: August 17, 2010
    Assignee: Kabushiki Kaisha TOPCON
    Inventors: Masahiro Ohishi, Fumio Ohtomo
  • Patent number: 7626686
    Abstract: To provide a surveying instrument for measuring difference in required time of light or distance to an object to be measured while covering a wide dynamic range without adjusting light amount. A light pulse emanating from a light emitting section 1 is divided into a reference light cast to a reference light path F1 and a measurement light cast to a measurement light path F2 through which the measurement light travels to and is reflected back from the object to be measured. These two light beams are received with a light receiving section 9. With a multiplex reflection optical fiber Mp1 interposed in the middle of the measurement light path F2, the measurement light comes out as a row of multiplex light pulses attenuating successively in light amount at a constant rate. From this row of pulses, a measurement light of approximately the same in received light level as the reference light may be selected.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: December 1, 2009
    Assignee: Topcon Corporation
    Inventors: Masahiro Ohishi, Yoshikatsu Tokuda
  • Publication number: 20090268193
    Abstract: A surveying instrument and a surveying method for further minimizing a measurement error when the surveying instrument casts a light to a measuring object and receives the reflected light and measures a delay time or a distance. A reference pulse light r and a measurement pulse light o1 are received as a received light signal by a light receiving section 9, and a damping signal S3U is formed from the received light signals r, o1, and an amplification rate of a minute level signal in the proximity of a zero cross point Q0 of the damping signal S3U is greatly amplified, and timing signals r?, o1? are formed by using an amplified signal. Therefore, the measurement error can be minimized.
    Type: Application
    Filed: August 10, 2006
    Publication date: October 29, 2009
    Inventors: Masahiro Ohishi, Isao Minegishi