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: 11029509
    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: Grant
    Filed: February 12, 2020
    Date of Patent: June 8, 2021
    Inventors: Tomonori Matsushita, Nozomu Hirokubo
  • Publication number: 20210025754
    Abstract: A spectroscopic camera includes an interference filter including a pair of reflection films and an imaging device that captures image light passing through the pair of reflection films. The interference filter is provided with a marker that changes the characteristic in accordance with which the image light passes, and the marker is provided in a position where the marker overlaps with the optical path of the image light that passes through the pair of reflection films.
    Type: Application
    Filed: July 24, 2020
    Publication date: January 28, 2021
    Inventors: Tomonori MATSUSHITA, Teruyuki NISHIMURA, Kei KUDO
  • Publication number: 20200183146
    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: February 12, 2020
    Publication date: June 11, 2020
    Inventors: Tomonori MATSUSHITA, Nozomu HIROKUBO
  • Publication number: 20200073034
    Abstract: An optical device includes an optical member having a plurality of first optical layers and a plurality of second optical layers having a refractive index different from that of the first optical layer in which the first optical layers and the second optical layers are laminated, and a layer thickness changing electrode that changes a thickness of the first optical layer in a lamination direction of the first optical layers and the second optical layers, in which the optical member is provided in a pair, and the pair of optical members is disposed to face each other through a gap, and a gap changing driver that changes a dimension of the gap.
    Type: Application
    Filed: August 29, 2019
    Publication date: March 5, 2020
    Inventors: Tomonori MATSUSHITA, Teruyuki NISHIMURA, Nozomu HIROKUBO
  • Patent number: 10156713
    Abstract: A wavelength variable interference filter includes a fixed reflection film, a movable reflection film, and an actuator that changes a gap between the films. A wavelength of output light is first wavelength ??. A center wavelength in a target wavelength region is measurement center wavelength ?0. A peak center wavelength in reflection characteristics of the movable reflection film is first center wavelength ?1. A peak center wavelength in reflection characteristics of the fixed reflection film is second center wavelength ?2. The gap between the films when light of the first wavelength ?? is transmitted is d?(?1 , ?2). When a pair of optical films face each other, a center wavelength in reflection characteristics of the pair is the measurement center wavelength ?0, and the light of the first wavelength ?? is outputted, the gap between the pair of optical films is d?(?0, ?0). Further, d?(?1, ?2)<d?(?0, ?0).
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: December 18, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Tomonori Matsushita
  • Patent number: 9995862
    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: Grant
    Filed: September 9, 2015
    Date of Patent: June 12, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Tomonori Matsushita, Tatsuo Urushidani
  • Patent number: 9939629
    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: Grant
    Filed: November 18, 2014
    Date of Patent: April 10, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Tomonori Matsushita
  • Publication number: 20180088316
    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: November 21, 2017
    Publication date: March 29, 2018
    Inventors: Tomonori Matsushita, Nozomu Hirokubo
  • Patent number: 9857221
    Abstract: A spectral camera includes a wavelength variable interference filter, an imaging unit having a plurality of light receiving elements arranged in a two-dimensional array configuration, and a wavelength acquisition unit which acquires center wavelengths of light beams received by the light receiving elements in accordance with signal values output from the light receiving elements when reference light is received by the imaging unit. Light amounts of the reference light corresponding to different wavelength components in a certain wavelength range are uniform in a plane, and different signal values are acquired when light beams of the different wavelength components are received by the light receiving elements.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: January 2, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Tomonori Matsushita
  • Patent number: 9829381
    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: Grant
    Filed: February 24, 2014
    Date of Patent: November 28, 2017
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Tomonori Matsushita, Akira Sano
  • Publication number: 20170102535
    Abstract: A wavelength variable interference filter includes a fixed reflection film, a movable reflection film, and an actuator that changes a gap between the films. A wavelength of output light is first wavelength ??. A center wavelength in a target wavelength region is measurement center wavelength ?0. A peak center wavelength in reflection characteristics of the movable reflection film is first center wavelength ?1. A peak center wavelength in reflection characteristics of the fixed reflection film is second center wavelength ?2. The gap between the films when light of the first wavelength ?? is transmitted is d?(?1, ?2). When a pair of optical films face each other, a center wavelength in reflection characteristics of the pair is the measurement center wavelength ?0, and the light of the first wavelength ?? is outputted, the gap between the pair of optical films is d?(?0, ?0). Further, d?(?1, ?2)<d?(?0, ?0).
    Type: Application
    Filed: October 5, 2016
    Publication date: April 13, 2017
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20160363760
    Abstract: An optical module includes a variable wavelength interference filter configured to transmit light including peak wavelengths corresponding to a gap dimension between a pair of reflection films and corresponding to a plurality of orders and first to third dichroic mirrors configured to separate light in a predetermined wavelength band and lights in wavelength bands other than the predetermined wavelength band. The plurality of first to third dichroic mirrors respectively correspond to different orders and are arranged in order such that the peak wavelengths corresponding to the orders are included in the predetermined wavelength band and transmitted light of the variable wavelength interference filter is made incident on the first dichroic mirror, second separated light of the first dichroic mirror is made incident on the second dichroic mirror, and second separated light of the second dichroic mirror is made incident on the third dichroic mirror.
    Type: Application
    Filed: July 24, 2014
    Publication date: December 15, 2016
    Inventors: Tomonori MATSUSHITA, Masashi KANAI
  • Patent number: 9389412
    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: Grant
    Filed: May 7, 2013
    Date of Patent: July 12, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Tomonori Matsushita
  • Patent number: 9377357
    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: Grant
    Filed: July 13, 2012
    Date of Patent: June 28, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Tomonori Matsushita, Yasushi Matsuno
  • Patent number: 9322966
    Abstract: An interference filter includes first and second reflecting films opposed to each other across a gap, the first and second reflecting films include an Ag—Sm—Cu alloy film or an Ag—Bi—Nd alloy film, the Ag—Sm—Cu alloy film includes 0.1 atomic %?Sm?0.5 atomic %, and 0.1 atomic %?Cu and ?0.5 atomic %, and Sm+Cu?1.0 atomic %, the Ag—Bi—Nd alloy film includes 0.1 atomic %?Bi?3.0 atomic %, and 0.1 atomic %?Nd?5.0 atomic %, and the thickness of the Ag—Sm—Cu alloy film or the Ag—Bi—Nd alloy film is ?10 nm and ?40 nm.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: April 26, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Susumu Shinto, Koji Kitahara, Tomonori Matsushita
  • Publication number: 20160037141
    Abstract: A spectral camera includes a wavelength variable interference filter, an imaging unit having a plurality of light receiving elements arranged in a two-dimensional array configuration, and a wavelength acquisition unit which acquires center wavelengths of light beams received by the light receiving elements in accordance with signal values output from the light receiving elements when reference light is received by the imaging unit. Light amounts of the reference light corresponding to different wavelength components in a certain wavelength range are uniform in a plane, and different signal values are acquired when light beams of the different wavelength components are received by the light receiving elements.
    Type: Application
    Filed: July 30, 2015
    Publication date: February 4, 2016
    Inventor: Tomonori MATSUSHITA
  • Publication number: 20160003993
    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: September 9, 2015
    Publication date: January 7, 2016
    Inventors: Tomonori MATSUSHITA, Tatsuo URUSHIDANI
  • Patent number: 9229219
    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: July 8, 2014
    Date of Patent: January 5, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Tomonori Matsushita, Tatsuo Urushidani
  • 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