Patents by Inventor Kazuhiro Hirota

Kazuhiro Hirota 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: 10105063
    Abstract: A flash lamp 32 excites a laser rod 31. A Q switch 35 which changes the loss of the optical resonator according to the voltage applied is inserted on the optical path of a pair of mirrors 33 and 34 forming the optical resonator. An optical path shutter 39 is provided on the optical path of laser emission light. In a first operation mode in which laser emission is performed, the optical path shutter 39 is opened and the voltage applied to the Q switch 35 is changed from a high voltage to, for example, 0 V to emit pulsed laser light after the flash lamp 32 excites the laser rod 31. In a second operation mode in which the laser emission is interrupted and waited for, the optical path shutter 39 is closed and the voltage applied to the Q switch 35 is, for example, 0 V.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: October 23, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Kazuhiro Hirota, Tadashi Kasamatsu
  • Patent number: 10098547
    Abstract: A photoacoustic measurement device 10 includes a probe 11 having a light emitting unit that emits measurement light L and a plurality of acoustic wave detection elements, a determination unit 28 that determines whether a state between the probe 11 and a subject M is a contact state or a non-contact state, and a light intensity control unit (for example, a switching control unit 36 and an intensity switching unit 37) that controls the intensity of the measurement light such that the measurement light has a first intensity or a second intensity higher than the first intensity, on the basis of the determination result of the determination unit 28. The determination unit 28 performs the determination on the basis of the status of a change in a plurality of photoacoustic signals detected by the plurality of acoustic wave detection elements.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: October 16, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Kazuhiro Hirota
  • Publication number: 20180235477
    Abstract: A photoacoustic imaging method is provided that can prevent the surface of the subject from appearing in an image when a part to be observed at a position deeper than the surface of the subject is imaged. The photoacoustic imaging device includes a unit for outputting pulsed light toward the subject, and generating photoacoustic data by detecting photoacoustic waves emitted from the subject exposed to the light. The photoacoustic imaging device also includes a region detection unit that detects a near-surface region of the subject based on the photoacoustic wave detection signals, and a correcting unit that attenuates (which encompasses removing) information of the near-surface region found by the region detection unit when the part to be observed is displayed.
    Type: Application
    Filed: April 20, 2018
    Publication date: August 23, 2018
    Applicant: FUJIFILM Corporation
    Inventors: Kazuhiro HIROTA, Kazuhiro TSUJITA
  • Patent number: 10052028
    Abstract: A photoacoustic imaging method that enables photoacoustic images to be displayed at high speed is provided. The photoacoustic imaging method scans a subject with a light beam, detects acoustic waves generated within the subject due to the scanning of light to obtain acoustic wave detected signals, and generates volume data that represent three dimensional photoacoustic images of the subject based on the acoustic wave detected signals. Photoacoustic projection images projected in the direction of irradiation depth of the light are generated, prior to the volume data being generated and concurrently with the scanning of the light. The photoacoustic projection images are displayed.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: August 21, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Kazuhiro Hirota
  • Publication number: 20180205364
    Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The excitation electrode includes a main thickness portion and an inclined portion, the main thickness portion has a constant thickness, the inclined portion is formed on a peripheral area of the main thickness portion, the inclined portion gradually decrease in thickness from a part contacting the main thickness portion toward an outermost periphery of the excitation electrode. The inclined portion has a width as an inclination width in a length of 0.84 times or more and 1.37 times or less of a first flexural wavelength and 2.29 times or more and 3.71 times or less of a second flexural wavelength, the first flexural wavelength is a wavelength of a flexure vibration at a fundamental wave of the thickness-shear vibration, the second flexural wavelength is a wavelength of a flexure vibration at a third harmonic of the thickness-shear vibration.
    Type: Application
    Filed: January 11, 2018
    Publication date: July 19, 2018
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Kazuhiro HIROTA
  • Patent number: 9974439
    Abstract: A photoacoustic imaging method is provided that can prevent the surface of the subject from appearing in an image when a part to be observed at a position deeper than the surface of the subject is imaged. The photoacoustic imaging device includes a unit for outputting pulsed light toward the subject, and generating photoacoustic data by detecting photoacoustic waves emitted from the subject exposed to the light. The photoacoustic imaging device also includes a region detection unit that detects a near-surface region of the subject based on the photoacoustic wave detection signals, and a correcting unit that attenuates (which encompasses removing) information of the near-surface region found by the region detection unit when the part to be observed is displayed.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: May 22, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Kazuhiro Hirota, Kazuhiro Tsujita
  • Publication number: 20180115301
    Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The piezoelectric substrate is formed in a flat plate shape and vibrates in a thickness-shear vibration mode. The excitation electrodes are disposed on respective both principal surfaces of the piezoelectric substrate. The excitation electrode includes a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion. The inclined portion has a thickness that gradually decreases from a portion contacting the main thickness portion to an outermost periphery of the excitation electrode. An inclination width as a width of the inclined portion has a length that is equal to or more than 0.5 times and equal to or less than three times of a flexural wavelength. The flexural wavelength is a wavelength of a flexure vibration as an unnecessary vibration.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 26, 2018
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Yoshiro TESHIMA, Kazuhiro HIROTA
  • Publication number: 20180072387
    Abstract: To provide a non-spherical tank which includes: a circular cylindrical portion; a top portion disposed continuously with an upper side of the circular cylindrical portion; and a bottom portion disposed continuously with a lower side of the circular cylindrical portion, wherein the top portion includes: a spherical shell portion which is formed of a portion of a spherical body having a radius R1, and is disposed at an upper end of the top portion; and a toroidal portion which is disposed continuously with the upper side of the circular cylindrical portion and with a lower side of the spherical shell portion respectively, and is formed of a portion of a spherical body having a radius R2 smaller than the radius R1, and an expression 1.0<R/H1<1.5 is satisfied. Here, “R” denotes a radius of the circular cylindrical portion, and “H1” denotes a height of the top portion in a vertical direction.
    Type: Application
    Filed: March 15, 2016
    Publication date: March 15, 2018
    Inventors: Takashi OKAFUJI, Kazuhiro HIROTA, Ryusuke TAKADA, Michihisa WATANABE, Kazuhiro MIURA
  • Publication number: 20180054181
    Abstract: A crystal resonator vibrates in a thickness-shear mode. The crystal resonator includes excitation electrodes being disposed on a front surface and a back surface of a crystal element. The excitation electrodes are disposed on the crystal element to have a positional relationship, where a displacement distribution at an edge of the excitation electrode on the front surface is identical to a displacement distribution at an edge of the excitation electrode on the back surface.
    Type: Application
    Filed: August 21, 2017
    Publication date: February 22, 2018
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Yoshiro TESHIMA, Kazuhiro HIROTA
  • Publication number: 20170319078
    Abstract: A flash lamp 32 excites a laser rod 31. A Q switch 35 which changes the loss of the optical resonator according to the voltage applied is inserted on the optical path of a pair of mirrors 33 and 34 forming the optical resonator. An optical path shutter 39 is provided on the optical path of laser emission light. In a first operation mode in which laser emission is performed, the optical path shutter 39 is opened and the voltage applied to the Q switch 35 is changed from a high voltage to, for example, 0 V to emit pulsed laser light after the flash lamp 32 excites the laser rod 31. In a second operation mode in which the laser emission is interrupted and waited for, the optical path shutter 39 is closed and the voltage applied to the Q switch 35 is, for example, 0 V.
    Type: Application
    Filed: July 20, 2017
    Publication date: November 9, 2017
    Applicant: FUJIFILM Corporation
    Inventors: Kazuhiro HIROTA, Tadashi KASAMATSU
  • Patent number: 9743840
    Abstract: A flash lamp 32 excites a laser rod 31. A Q switch 35 which changes the loss of the optical resonator according to the voltage applied is inserted on the optical path of a pair of mirrors 33 and 34 forming the optical resonator. An optical path shutter 39 is provided on the optical path of laser emission light. In a first operation mode in which laser emission is performed, the optical path shutter 39 is opened and the voltage applied to the Q switch 35 is changed from a high voltage to, for example, 0 V to emit pulsed laser light after the flash lamp 32 excites the laser rod 31. In a second operation mode in which the laser emission is interrupted and waited for, the optical path shutter 39 is closed and the voltage applied to the Q switch 35 is, for example, 0 V.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: August 29, 2017
    Assignee: FUJIFILM Corporation
    Inventors: Kazuhiro Hirota, Tadashi Kasamatsu
  • Publication number: 20170229830
    Abstract: In a solid-state laser device and a photoacoustic measurement device including the solid-state laser device, the distance between a laser rod and a flash lamp is narrowed. A shielding lid shields mirrors and an optical path of laser light from the outside. A first portion of a frame body of a laser chamber is exposed from the shielding lid. A flash lamp stored in the frame body of the laser chamber is able to be removed from and inserted into the first portion of the frame body. A thin film portion having a thickness smaller than the thickness of other portions of the shielding lid is provided in at least a part of a region of the shielding lid covering the optical path of a light beam on the outside in a longitudinal direction from the first portion of the frame body of the laser chamber.
    Type: Application
    Filed: September 15, 2016
    Publication date: August 10, 2017
    Applicant: FUJIFILM Corporation
    Inventors: Kazuhiro HIROTA, Hiroyasu ISHII, Takuji TADA
  • Publication number: 20170187348
    Abstract: A piezoelectric vibrating piece includes a vibrating piece body including a vibrator and at least one pair of excitation electrodes formed on a front surface and a back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece. The pair of excitation electrodes are arranged in a Z??-axis direction determined by an X??-axis and obliquely disposed with respect to the Y?-axis direction. The X??-axis is rotated by 260° to 300° counterclockwise about a Y?-axis using a +X?-axis direction as a reference. The pair of excitation electrodes are formed to have respective semicircle shapes including straight line portions extending in the X??-axis direction and to be disposed in a state where the straight line portions overlapping with one another. The straight line portion of the excitation electrode includes an inclined portion that gradually decreases in thickness toward an end portion of the excitation electrode.
    Type: Application
    Filed: December 22, 2016
    Publication date: June 29, 2017
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Kazuhiro HIROTA, Yoshiro TESHIMA, Masaaki NAKAHARA
  • Publication number: 20170187349
    Abstract: An AT-cut crystal element includes a crystal element having two side surfaces (namely, a Z?-surface) intersecting with a Z-axis of a crystallographic axis thereof. At least one of the two side surfaces is constituted of three of first to third surfaces. The first to the third surfaces meeting following conditions: the first to the third surfaces intersect with one another in this order and formed by rotating a principal surface of the crystal element by predetermined angles; and expressing the angle of the first surface as ?1, a length of the first surface as D, a thickness of a part of the crystal element having the principal surface as t, and M=D/t, and a conversion percentage as fn (M, (?1)), the ?1 and the M are set such that the conversion percentage fn (M, (?1)) becomes a predetermined value Th or less.
    Type: Application
    Filed: December 28, 2016
    Publication date: June 29, 2017
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yoshiharu SATO, Yoshiro TESHIMA, Hirokazu IWATA, Kazuhiro HIROTA
  • Publication number: 20170181639
    Abstract: After light has been output to a subject to be examined, a photoacoustic wave induced in the subject by the output light is detected. It is assumed that at least one virtual detector element is present outside of a real detector, and dummy data corresponding to the at least one virtual detector element are added to photoacoustic data in which pieces of data of the photoacoustic wave detected by the detector are arranged in accordance with the positions of detector elements. A photoacoustic image is generated by reconstructing the photoacoustic data to which the dummy data have been added by using a Fourier transform method.
    Type: Application
    Filed: March 13, 2017
    Publication date: June 29, 2017
    Applicant: FUJIFILM Corporation
    Inventors: Kaku IRISAWA, Kazuhiro HIROTA
  • Patent number: 9629557
    Abstract: After light has been output to a subject to be examined, a photoacoustic wave induced in the subject by the output light is detected. It is assumed that at least one virtual detector element is present outside of a real detector, and dummy data corresponding to the at least one virtual detector element are added to photoacoustic data in which pieces of data of the photoacoustic wave detected by the detector are arranged in accordance with the positions of detector elements. A photoacoustic image is generated by reconstructing the photoacoustic data to which the dummy data have been added by using a Fourier transform method.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: April 25, 2017
    Assignee: FUJIFILM Corporation
    Inventors: Kaku Irisawa, Kazuhiro Hirota
  • Publication number: 20170100041
    Abstract: A probe has a light guide unit that guides the measurement light, an acoustic wave detection unit that detects a photoacoustic wave, and a storage unit that stores light intensity profile information that represents the light intensity profile of the measurement light emitted by the probe, and transmits a signal of the photoacoustic wave detected by the acoustic wave detection unit to the signal processing unit in a state in which the probe is mounted in the apparatus body. The apparatus body has a reading unit that reads the light intensity profile information from the storage unit, and the intensity adjusting unit adjusts the intensity of the measurement light employing the light intensity profile information read by the reading unit.
    Type: Application
    Filed: December 22, 2016
    Publication date: April 13, 2017
    Applicant: FUJIFILM Corporation
    Inventors: Tadashi KASAMATSU, Kazuhiro HIROTA
  • Patent number: 9486144
    Abstract: Using a laser source unit, pulse laser beams having a plurality of wavelengths is switched and emitted. A Q switch is inserted into an optical resonator including a pair of mirrors which face each other with a laser rod interposed therebetween. A wavelength selection unit includes a plurality of band pass filters having different transmission wavelengths, and selectively inserts the plurality of band pass filters into a light path of the optical resonator. A trigger control circuit controls driving unit that drives the wavelength selection unit so that the band pass filters inserted into the light path of the optical resonator are switched at a predetermined switching speed. In addition, the trigger control circuit causes the laser rod to be irradiated with excitation light from a flash lamp, and then turns on the Q switch at a timing when the wavelength selection unit inserts the band pass filter.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: November 8, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Kazuhiro Hirota, Tadashi Kasamatsu
  • Patent number: 9392944
    Abstract: A pulse laser beam is emitted in a desired wavelength sequence using a laser light source unit. A Q switch and a birefringent filter are inserted into an optical resonator including a pair of mirrors and facing each other with a laser rod interposed therebetween. The birefringent filter changes an oscillation wavelength of the optical resonator in association with rotational displacement. The rotation control unit rotates the birefringent filter at a predetermined rotation speed depending on the number of wavelengths included in the wavelength sequence of the pulse laser beam to be emitted. An emission control unit irradiates the laser rod with excitation light, and then turns on the Q switch at a timing when a rotational-displacement-position of the birefringent filter is set to a position corresponding to the wavelength of the pulse laser beam to be emitted, to cause the pulse laser beam to be emitted.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: July 19, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Tadashi Kasamatsu, Kaku Irisawa, Kazuhiro Hirota
  • Patent number: 9380944
    Abstract: A pulse laser beam is emitted in a desired wavelength sequence using a laser source unit. A Q switch and a birefringent filter are inserted into an optical resonator including a pair of mirrors and facing each other with a laser rod interposed therebetween. The birefringent filter changes an oscillation wavelength of the optical resonator in association with rotational displacement. A trigger control circuit rotates the birefringent filter at a predetermined rotation speed depending on the number of wavelengths included in the wavelength sequence of the pulse laser beam to be emitted. In addition, the trigger control circuit irradiates the laser rod with excitation light, and turns on the Q switch at a timing when a rotational displacement position of the birefringent filter is set to a position corresponding to the wavelength of the pulse laser beam to be emitted, to cause the pulse laser beam to be emitted.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: July 5, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Kazuhiro Hirota, Tadashi Kasamatsu