Patents by Inventor Tomonori Matsushita

Tomonori Matsushita 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: 9134175
    Abstract: A spectrometry device includes a wavelength-tunable interference filter that is provided with a stationary reflection film, a movable reflection film and an electrostatic actuator which changes a gap dimension between the stationary reflection film and the movable reflection film; a detector that receives incident light; a filter control unit that sets the gap dimension between the stationary reflection film and the movable reflection film to be a first dimension corresponding to light having a first wavelength which is smaller than that of a measurement target wavelength region; a cutoff filter that cuts off the light having a wavelength which is smaller than that of the measurement target wavelength region; and a light quantity acquisition unit that acquires the light quantity of stray light received by the detector when the gap dimension is changed to be the first dimension.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: September 15, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Tomonori Matsushita
  • Publication number: 20150228834
    Abstract: Provided is a photovoltaic device prepared with a compound semiconductor, capable of reducing hazardous property and improving efficiency, and a method for manufacturing the photovoltaic device, the photovoltaic device including a photoelectric conversion layer including a compound semiconductor, a semiconductor layer layered on a surface of the photoelectric conversion layer, a contact layer arranged on the opposite side of the semiconductor layer to the photoelectric conversion layer, and an electrode layered on a surface of the contact layer, wherein the semiconductor layer includes a first crystal including Al, In, and P, and the contact layer includes a second crystal including Ge as a main component.
    Type: Application
    Filed: September 24, 2013
    Publication date: August 13, 2015
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, THE UNIVERSITY OF TOKYO
    Inventors: Taizo Masuda, Kenichi Okumura, Takashi Kondo, Tomonori Matsushita
  • Publication number: 20150138640
    Abstract: An optical filter device includes a variable wavelength interference filter having a pair of reflecting films opposed to each other, and an electrostatic actuator adapted to change a gap dimension between the pair of reflecting films, and at least one bandpass filter disposed on an optical axis of the pair of reflecting films, and the bandpass filter includes a plurality of transmission wavelength bands in which light is transmitted.
    Type: Application
    Filed: November 18, 2014
    Publication date: May 21, 2015
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20140320854
    Abstract: An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength ?1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength ?2 different from the first wavelength as a center wavelength.
    Type: Application
    Filed: July 8, 2014
    Publication date: October 30, 2014
    Inventors: Tomonori MATSUSHITA, Tatsuo URUSHIDANI
  • Publication number: 20140268343
    Abstract: A light filter has a first reflecting film and a second reflecting film opposed to each other, a first electrode, a second electrode, a third electrode, a fourth electrode, and a potential difference control unit, the first electrode and the third electrode are opposed at a first distance, the second electrode and the fourth electrode are opposed at a second distance different from the first distance, the potential difference control unit brings the first electrode and the third electrode into contact by producing a potential difference between the first electrode and the third electrode and brings the second electrode and the fourth electrode into contact by producing a potential difference between the second electrode and the fourth electrode, and thereby, a gap between the first reflecting film and the second reflecting film may be controlled with high accuracy.
    Type: Application
    Filed: June 10, 2014
    Publication date: September 18, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20140268342
    Abstract: An optical filter device includes a housing including a light passage hole making light incident on the inner side, an aperture on the outer side of the housing and limiting the light made incident on the incident light passage hole, and an interference filter on the inner side of the housing and including a fixed reflection film and a movable reflection film. In a plan view of the fixed reflection film and the movable reflection film, an opening of the aperture, the light passage hole, and the fixed reflection film and the movable reflection film overlap one another. When the diameter of the fixed reflection film close to the light passage hole is ?m, the bore of the light passage hole is ?p, and the opening diameter of the aperture is ?a, ?a<?m<?p.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20140240711
    Abstract: A spectrometry device includes a wavelength-tunable interference filter that is provided with a stationary reflection film, a movable reflection film and an electrostatic actuator which changes a gap dimension between the stationary reflection film and the movable reflection film; a detector that receives incident light; a filter control unit that sets the gap dimension between the stationary reflection film and the movable reflection film to be a first dimension corresponding to light having a first wavelength which is smaller than that of a measurement target wavelength region; a cutoff filter that cuts off the light having a wavelength which is smaller than that of the measurement target wavelength region; and a light quantity acquisition unit that acquires the light quantity of stray light received by the detector when the gap dimension is changed to be the first dimension.
    Type: Application
    Filed: February 24, 2014
    Publication date: August 28, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20140240708
    Abstract: A communication system includes a transmission terminal for displaying a color code having a plurality of colors of code patterns arranged two-dimensionally, and a spectroscopic measurement device including a variable wavelength interference filter for dispersing the light from the image displayed on the transmission terminal, an imaging section adapted to image the light dispersed by the variable wavelength interference filter to obtain a spectral image, a colorimetric section adapted to measure a dispersion spectrum of each of pixels in each of spectral images of a plurality of wavelengths with respect to the color code based on the light intensity value in each of the pixels, in the case in which the spectral images are obtained, and a decode section adapted to detect an arrangement of the code patterns based on the pixel positions and the dispersion spectrums of the respective pixels, and decode the color code.
    Type: Application
    Filed: February 24, 2014
    Publication date: August 28, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomonori MATSUSHITA, Akira SANO
  • Patent number: 8817267
    Abstract: An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength ?1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength ?2 different from the first wavelength as a center wavelength.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: August 26, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Tomonori Matsushita, Tatsuo Urushidani
  • Patent number: 8797650
    Abstract: A wavelength-variable interference filter includes first and second electrodes provided at first and second substrates, respectively, the second substrate including a movable section, first and second electrode wires that extend from the first and second electrodes toward outer circumferential edges of the first and second substrates, respectively, a first opposite electrode wire disposed so as to be isolated from the second electrode, and a first conductive section that connects the first electrode wire with the first opposite electrode wire. The second electrode wire and the first opposite electrode wire extend passing through a center point of an imaginary circle of the movable section in respective directions and dividing the imaginary circle at regular angular intervals.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: August 5, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Tomonori Matsushita, Yasushi Matsuno
  • Publication number: 20140211315
    Abstract: An optical module includes a stationary substrate, a movable substrate, a stationary reflecting film provided to the stationary substrate, a movable reflecting film provided to the movable substrate and opposed to the stationary reflecting film, a first control electrode disposed outside the stationary reflecting film in a filter plan view, a second control electrode disposed outside the movable reflecting film in the filter plan view, and opposed to the first control electrode, and a tilt control section adapted to make a first control current flow through the first control electrode, and make a second control current, which has an opposite direction to the first control current in the filter plan view, flow through the second control electrode.
    Type: Application
    Filed: January 28, 2014
    Publication date: July 31, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20140078503
    Abstract: A spectrometer includes a first reflective film, a second reflective film facing the first reflective film with a gap interposed therebetween, a gap change portion that changes the amount of the gap by changing the relative position of the second reflective film with respect to the first reflective film, and a processing unit that outputs optical characteristic data at a predetermined first wavelength interval on the basis of light of a plurality of the wavelengths to be measured which are extracted by the first reflective film and the second reflective film by changing the gap amount using the gap change portion, wherein a full width at half maximum of a spectrum of at least one component of light among the light of the plurality of wavelengths to be measured which are extracted by the first reflective film and the second reflective film is larger than the first wavelength interval.
    Type: Application
    Filed: September 18, 2013
    Publication date: March 20, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Tomonori Matsushita, Yoshifumi Arai
  • Publication number: 20140071445
    Abstract: An optical module includes a wavelength variable interference filter having a fixed reflective film, a movable reflective film which faces the fixed reflective film with a gap between reflective films interposed therebetween, and an electrostatic actuator that changes the gap between reflective films, and a gap control unit that controls the electrostatic actuator. The gap control unit controls the electrostatic actuator on the basis of an order which is set in accordance with a wavelength to be measured, and changes the gap between the reflective films.
    Type: Application
    Filed: September 12, 2013
    Publication date: March 13, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Tomonori MATSUSHITA, Nozomu Hirokubo
  • Publication number: 20130306838
    Abstract: A variable-wavelength interference filter includes: a first substrate; a second substrate facing the first substrate; a first reflection layer provided on a surface facing the second substrate, of the first substrate; a second reflection layer which is provided on a surface facing the first substrate, of the second substrate, and faces the first reflection layer via an inter-layer gap; and an electrostatic actuator which flexes the second substrate in a direction toward the first substrate and thus changes the inter-layer gap. The first reflection layer and the second reflection layer have a reflectance characteristic showing a higher reflectance to light with a second wavelength that is shorter than a first wavelength, than a reflectance to light with the first wavelength.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 21, 2013
    Applicant: Seiko Epson Corporation
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20130027707
    Abstract: A filter includes a fixed substrate, a movable substrate opposed to the fixed substrate, a first reflection film provided on a surface of the fixed substrate facing the movable substrate, a second reflection film provided on the movable substrate and opposed to the first reflection film across a gap, a first electrode provided on the surface of the fixed substrate facing the movable substrate, a second electrode provided on the movable substrate and opposed to the first electrode, bonding parts provided on opposing surfaces of the fixed and movable substrates and bonding the fixed substrate to the movable substrate, and a groove part provided in at least one of the opposing surfaces, and the gap is in communication with an exterior of the filter via the groove part.
    Type: Application
    Filed: July 13, 2012
    Publication date: January 31, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomonori MATSUSHITA, Yasushi MATSUNO
  • Publication number: 20120200926
    Abstract: An optical filter includes a first substrate, a second substrate, a first reflective film that is disposed on the first substrate, a second reflective film that is disposed on the second substrate, first and second fixed electrodes that are disposed on the first substrate at positions located at the periphery of the first reflective film in plan view, and first and second variable electrodes that are disposed on the second substrate and face the first and second fixed electrodes. Slit portions of the second variable electrode are formed such that the first and second variable electrodes have a center symmetrical structure with the reflective film as its center.
    Type: Application
    Filed: February 3, 2012
    Publication date: August 9, 2012
    Applicant: Seiko Epson Corporation
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20120147380
    Abstract: A wavelength-variable interference filter includes first and second electrodes provided at first and second substrates, respectively, the second substrate including a movable section, first and second electrode wires that extend from the first and second electrodes toward outer circumferential edges of the first and second substrates, respectively, a first opposite electrode wire disposed so as to be isolated from the second electrode, and a first conductive section that connects the first electrode wire with the first opposite electrode wire. The second electrode wire and the first opposite electrode wire extend passing through a center point of an imaginary circle of the movable section in respective directions and dividing the imaginary circle at regular angular intervals.
    Type: Application
    Filed: December 7, 2011
    Publication date: June 14, 2012
    Applicant: Seiko Epson Corporation
    Inventors: Tomonori MATSUSHITA, Yasushi MATSUNO
  • Publication number: 20120044492
    Abstract: An Etalon filter includes a first substrate, a second substrate which faces the first substrate, a first optical film which is provided on the first substrate, and a second optical film which is provided on the second substrate to face the first optical film. The reflective characteristic of the first optical film determined by the reflectance of light of each wavelength in a reflective band is different from the reflective characteristic of the second optical film determined by the reflectance of light of each wavelength in the reflective band. The first optical film can have a reflective characteristic with a first wavelength ?1 as a center wavelength, and the second optical film can have a reflective characteristic with a second wavelength ?2 different from the first wavelength as a center wavelength.
    Type: Application
    Filed: August 17, 2011
    Publication date: February 23, 2012
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomonori MATSUSHITA, Tatsuo URUSHIDANI
  • Publication number: 20120008141
    Abstract: An optical filter includes: a first variable wavelength bandpass filter that can extract light of a first wavelength band (400 to 460 nm), the first wavelength band having a first spectral band having a central wavelength equal to a first wavelength in the first wavelength band and a second spectral band having a central wavelength equal to a second wavelength in the first wavelength band; and a second variable wavelength bandpass filter that can extract light of a second wavelength band (480 to 540 nm) adjacent to the first wavelength band, the second wavelength band having a third spectral band having a central wavelength equal to a third wavelength in the second wavelength band and a fourth spectral band having a central wavelength equal to a fourth wavelength in the second wavelength band.
    Type: Application
    Filed: May 27, 2011
    Publication date: January 12, 2012
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tomonori MATSUSHITA, Tatsuo URUSHIDANI
  • Publication number: 20110228397
    Abstract: A light filter has a first reflecting film and a second reflecting film opposed to each other, a first electrode, a second electrode, a third electrode, a fourth electrode, and a potential difference control unit, the first electrode and the third electrode are opposed at a first distance, the second electrode and the fourth electrode are opposed at a second distance different from the first distance, the potential difference control unit brings the first electrode and the third electrode into contact by producing a potential difference between the first electrode and the third electrode and brings the second electrode and the fourth electrode into contact by producing a potential difference between the second electrode and the fourth electrode, and thereby, a gap between the first reflecting film and the second reflecting film may be controlled with high accuracy.
    Type: Application
    Filed: March 10, 2011
    Publication date: September 22, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Tomonori MATSUSHITA