Patents by Inventor Tomoto Kawamura
Tomoto Kawamura 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).
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Patent number: 10365490Abstract: A head-mounted display (101) includes: an imaging assembly (203) imaging scenery seen by a user to generate a source picture; a storage unit (202) storing color correction factors used for correcting brightness of each of a red, green and blue color components included in a picture; a correction picture generator (212) performing color correction processing for enhancing a color component with a relatively low color correction factor stored in the storage unit (202), of the red, green and blue color components forming the source picture, to generate a correction picture; a picture display assembly (207) displaying the correction picture in the field of view of the user under a condition where he/she is able to perceive the outside world; and a special picture processor (213) performing picture processing for overlaying the correction picture and the source picture on each other for display.Type: GrantFiled: May 19, 2015Date of Patent: July 30, 2019Assignee: Maxell, Ltd.Inventors: Shingo Hayashi, Satoshi Ouchi, Yoshiho Seo, Tomoto Kawamura, Seiji Murata, Takahiro Matsuda, Toshiteru Nakamura
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Patent number: 10303047Abstract: The purpose of the present disclosure is to provide a small optical integrator for increasing color mixing property and homogeneity. An optical integrator is provided with a light entrance surface and exit surface (002, 003), and side surfaces (004, 005, 006, 007) that connect the entrance surface and the exit surface, and is internally filled with a light guide material having a refractive index. The light guide material contains scattering particles for scattering light that have a refractive index different from the refractive index of the light guide material. The light that has entered via the entrance surface propagates from the entrance surface side toward the exit surface while being scattered by the scattering particles in the light guide material, wherein part of the scattered light is guided to the exit surface by propagating while being confined, by internal reflection on the side surfaces, in the light detector.Type: GrantFiled: September 7, 2015Date of Patent: May 28, 2019Assignee: HITACHI CHEMICAL COMPANY, LTD.Inventors: Tomoto Kawamura, Toshihiro Kuroda, Daichi Sakai, Toshiyuki Takaiwa, Yutaka Kawakami, Toshiteru Nakamura
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Publication number: 20190004408Abstract: An optical mixer efficiently homogenizes light flux emitted from a plurality of light sources emitting light having different wavelengths to provide a multi-wavelength homogeneous light source. The optical mixer has a columnar shape made of a transparent material, a length of the side surfaces is larger than an outermost diameter of a top surface or a bottom surface of the columnar shape, and a large number of scattering particles scattering light contained inside the optical mixer. The side surface of the optical mixer reflects light, and the top surface and the bottom surface thereof transmit light. Thereby, a function of mixing light incident from the top or bottom surface by the reflecting function of the side surface and the scattering function of the scattering particles is provided.Type: ApplicationFiled: February 2, 2017Publication date: January 3, 2019Inventors: Tomoto KAWAMURA, Toshiteru NAKAMURA, Seiji MURATA, Yoshiho SEO, Toshihiro KURODA, Yutaka KAWAKAMI, Daichi SAKAI, Toshiyuki TAKAIWA
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Publication number: 20180296094Abstract: An object of the invention is to provide a technology for further improving scanning performance. Provided is an optical scanning device including: a scanning unit including an optical waveguide configured to guide incident light and emit the light from an emission end, and a vibration unit configured to generate a vibration and vibrate the emission end; and a signal transmission unit configured to transmit a signal to the scanning unit and cause the scanning unit to scan an object, characterized in that the scanning unit includes a first bonding and vibration attenuating unit configured to bond, with an elastic member, an end surface of the vibration unit closer to the emission end and the optical waveguide.Type: ApplicationFiled: March 24, 2016Publication date: October 18, 2018Inventors: Toshiteru NAKAMURA, Satoshi OUCHI, Yoshiho SEO, Kouji FUJITA, Shinsuke ONOE, Kenichiro YAMADA, Tomoto KAWAMURA
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Patent number: 10078236Abstract: There are provided a dimmer that can solve practical problems including burn-in and easily change a transmittance to external light and a video display device using the same. A dimmer includes a stack of two or more light control layers that change a transmittance to incident light by controlling an applied voltage in the incident direction of the incident light. A video display device includes a video generator that generates picture light; a video projector that projects the picture light as a virtual image in the field of view of a user; the dimmer disposed on the opposite side of the projecting side of the video projector to the user for adjusting the light quantity of external light to be entered to a user's eye through the video projector; and a light controller that controls the dimmer suitable for the luminosity of external light detected at an external light detector.Type: GrantFiled: December 27, 2016Date of Patent: September 18, 2018Assignee: Hitachi-LG Data Storage, Inc.Inventors: Shingo Hayashi, Satoshi Ouchi, Yoshiho Seo, Tomoto Kawamura, Seiji Murata, Takahiro Matsuda, Toshiteru Nakamura
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Publication number: 20180203338Abstract: To provide an illumination device having high efficiency, an illumination method, a video projection apparatus using the same. In order to achieve the object, there is provided an illumination device configured to include a light source and a light condensing body which condenses light from the light source to be emitted, and the light condensing body includes an incidence surface of a light source side, an emission surface emitting light, and a side surface which is present between the incidence surface and the emission surface, the side surface is a curved surface of which a distance from a light axis in a direction orthogonal to the light emitting surface of the light source at the center of the light source becomes large from the incidence surface toward the emission surface and has a plurality of curved-surface-shapes of which shapes of the curved surfaces are different from each other.Type: ApplicationFiled: December 11, 2015Publication date: July 19, 2018Inventors: Tomoto KAWAMURA, Seiji MURATA, Ryuji UKAI, Toshiyuki TAKAIWA, Toshihiro KURODA, Daichi SAKAI, Yutaka KAWAKAMI, Toshiteru NAKAMURA
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Publication number: 20180129050Abstract: A head-mounted display (101) includes: an imaging assembly (203) imaging scenery seen by a user to generate a source picture; a storage unit (202) storing color correction factors used for correcting brightness of each of a red, green and blue color components included in a picture; a correction picture generator (212) performing color correction processing for enhancing a color component with a relatively low color correction factor stored in the storage unit (202), of the red, green and blue color components forming the source picture, to generate a correction picture; a picture display assembly (207) displaying the correction picture in the field of view of the user under a condition where he/she is able to perceive the outside world; and a special picture processor (213) performing picture processing for overlaying the correction picture and the source picture on each other for display.Type: ApplicationFiled: May 19, 2015Publication date: May 10, 2018Inventors: Shingo HAYASHI, Satoshi OUCHI, Yoshiho SEO, Tomoto KAWAMURA, Seiji MURATA, Takahiro MATSUDA, Toshiteru NAKAMURA
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Patent number: 9927613Abstract: An image display apparatus which displays, as a virtual image, image in a visual field of a user, including an image generation section to generate image; an illumination section to illuminate light to the image generation section; and a projection section by which the image generated by the image generation section is projected, as a virtual image, into the visual field of the user, the projection section includes: a prism lens formed by integrating, by predetermined unit, a lens to generate the virtual image, with a prism provided thereon with a half mirror film which bends, in the direction of the pupil, a signal light from the image generation section; and aperture restriction unit which is provided on the incident surface of the prism lens, and which allows light in a predetermined area of the signal light from the image generation section to pass therethrough.Type: GrantFiled: November 10, 2015Date of Patent: March 27, 2018Assignee: Hitachi-LG Data Storage, Inc.Inventors: Toshiteru Nakamura, Satoshi Ouchi, Yoshiho Seo, Tomoto Kawamura, Yoshio Okamoto
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Publication number: 20170299955Abstract: The purpose of the present disclosure is to provide a small optical integrator for increasing color mixing property and homogeneity. An optical integrator is provided with a light entrance surface and exit surface (002, 003), and side surfaces (004, 005, 006, 007) that connect the entrance surface and the exit surface, and is internally filled with a light guide material having a refractive index. The light guide material contains scattering particles for scattering light that have a refractive index different from the refractive index of the light guide material. The light that has entered via the entrance surface propagates from the entrance surface side toward the exit surface while being scattered by the scattering particles in the light guide material, wherein part of the scattered light is guided to the exit surface by propagating while being confined, by internal reflection on the side surfaces, in the light detector.Type: ApplicationFiled: September 7, 2015Publication date: October 19, 2017Applicant: HITACHI CHEMICAL COMPANY, LTD.Inventors: Tomoto KAWAMURA, Toshihiro KURODA, Daichi SAKAI, Toshiyuki TAKAIWA, Yutaka KAWAKAMI, Toshiteru NAKAMURA
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Publication number: 20170184894Abstract: There are provided a dimmer that can solve practical problems including burn-in and easily change a transmittance to external light and a video display device using the same. A dimmer includes a stack of two or more light control layers that change a transmittance to incident light by controlling an applied voltage in the incident direction of the incident light. A video display device includes a video generator that generates picture light; a video projector that projects the picture light as a virtual image in the field of view of a user; the dimmer disposed on the opposite side of the projecting side of the video projector to the user for adjusting the light quantity of external light to be entered to a user's eye through the video projector; and a light controller that controls the dimmer suitable for the luminosity of external light detected at an external light detector.Type: ApplicationFiled: December 27, 2016Publication date: June 29, 2017Inventors: Shingo HAYASHI, Satoshi OUCHI, Yoshiho SEO, Tomoto KAWAMURA, Seiji MURATA, Takahiro MATSUDA, Toshiteru NAKAMURA
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Publication number: 20170116479Abstract: An information display terminal includes an arithmetic unit performing a process that selects a predetermined type of communication unit among a plurality of types of communication units on the basis of, for example, information related to first objects recognized from a captured image, which is stored in advance, and acquires the related information from a predetermined device on the Internet through the communication unit and a process that, when the presence of a second object or a predetermined positional relationship between the first objects and the second object is specified in the captured image, displays the related information of the first objects in a viewing direction, using a display unit.Type: ApplicationFiled: April 8, 2014Publication date: April 27, 2017Applicant: Hitachi Maxwell, Ltd.Inventors: Satoshi OUCHI, Yoshiho SEO, Yuya OGI, Tomoto KAWAMURA, Toshiteru NAKAMURA
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Patent number: 9551917Abstract: The projection display system has a light source unit where a first light source and a second light source respectively emitting a first and second wavelength or wavelength range of light are juxtapositionally arranged; a third light source emitting a third wavelength or wavelength range of light; an optical combiner device for combining the three wavelengths or wavelength ranges of light from the light sources; an optical device for averaging distributions of the wavelengths or wavelength ranges of light; an image display device for receiving the light transmitted through the optical device and forming image light responsive to a video signal; and a projector lens for projecting the image light onto a screen. At least two of the optical axes of the first, second, and third wavelengths or wavelength ranges of light which are incident on the optical device are not coincident with each other.Type: GrantFiled: October 8, 2013Date of Patent: January 24, 2017Assignee: HITACHI CONSUMER ELECTRONICS CO., LTD.Inventors: Mitsuru Nagasawa, Satoshi Ouchi, Kunikazu Ohnishi, Tomoto Kawamura
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Publication number: 20160313560Abstract: A head mounted display uses an image projection device comprising: an image generation unit for generating an image; a projection unit for guiding the image generated by the image generation unit to an observer's eyes; and a support for linking the projection unit and the image generation unit. The projection unit has a lens function which makes it easiest to see an image generated by the projection unit at a distance (Lobj) within a range between 30 cm and 3 m. Thereby, the image projection device operates at high resolution, has reduced size and weight, and reduces energy consumption.Type: ApplicationFiled: October 31, 2014Publication date: October 27, 2016Applicant: HITACHI-LG DATA STORAGE, INC.Inventors: Tomoto KAWAMURA, Satoshi OUCHI, Yoshiho SEO, Toshiteru NAKAMURA, Hidenao SAITO, Kenji KIYA, Yoshio OKAMOTO
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Publication number: 20160131909Abstract: An image display apparatus which displays, as a virtual image, image in a visual field of a user, including an image generation section to generate image; an illumination section to illuminate light to the image generation section; and a projection section by which the image generated by the image generation section is projected, as a virtual image, into the visual field of the user, the projection section includes: a prism lens formed by integrating, by predetermined unit, a lens to generate the virtual image, with a prism provided thereon with a half mirror film which bends, in the direction of the pupil, a signal light from the image generation section; and aperture restriction unit which is provided on the incident surface of the prism lens, and which allows light in a predetermined area of the signal light from the image generation section to pass therethrough.Type: ApplicationFiled: November 10, 2015Publication date: May 12, 2016Inventors: Toshiteru NAKAMURA, Satoshi OUCHI, Yoshiho SEO, Tomoto KAWAMURA, Yoshio OKAMOTO
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Publication number: 20160041396Abstract: A video projection device 001 includes a video generation section 041 that has a micro display element 003 which generates video and an illuminating optical system 002 which illuminates a micro display element; projection section 043 that project the video which is generated by the video generation section onto the eyes of a user through an eyepiece section; and a mechanical support section 042 that connects the video generation section to the projection section using a housing section. The mechanical support section includes at least one transparent area 011 that is surrounded by the housing section, and penetrates in a direction parallel to a direction in which the video from the projection section is projected. The illuminating optical system includes a light source that emits light in a plurality of wavelength bands, and a controller 440 that controls the output of the light source.Type: ApplicationFiled: August 4, 2015Publication date: February 11, 2016Inventors: Tomoto KAWAMURA, Toshiteru NAKAMURA, Yoshiho SEO, Satoshi OUCHI, Hidenao SAITO, Yoshio OKAMOTO, Kenji KIYA
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Publication number: 20150309400Abstract: A light source module and an image projection device which can have high resolution and high optical efficiency are provided with a simple optical system. A light source module includes a light source unit formed by a plurality of stacked light emission surfaces which emit lights of at least red, blue, and green wavelength bands, and a light-source drive and control unit which supplies a driving current to the respective light emission surfaces of the light source unit. Each of the light emission surfaces of the light source unit has a nanostructure smaller than a wavelength of visible light near a p-n junction provided in a semiconductor having a larger band gap than the visible light, and emits a light of a corresponding one of the wavelength bands via a phonon level.Type: ApplicationFiled: April 24, 2015Publication date: October 29, 2015Applicant: Hitachi-LG Data Storage, Inc.Inventors: Tomoto KAWAMURA, Satoshi OOUCHI, Yoshiho SEO, Toshiteru NAKAMURA, Yuya OGI
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Publication number: 20140098349Abstract: The projection display system has a light source unit where a first light source and a second light source respectively emitting a first and second wavelength or wavelength range of light are juxtapositionally arranged; a third light source emitting a third wavelength or wavelength range of light; an optical combiner device for combining the three wavelengths or wavelength ranges of light from the light sources; an optical device for averaging distributions of the wavelengths or wavelength ranges of light; an image display device for receiving the light transmitted through the optical device and forming image light responsive to a video signal; and a projector lens for projecting the image light onto a screen. At least two of the optical axes of the first, second, and third wavelengths or wavelength ranges of light which are incident on the optical device are not coincident with each other.Type: ApplicationFiled: October 8, 2013Publication date: April 10, 2014Applicant: Hitachi Media Electronics Co., Ltd.Inventors: Mitsuru NAGASAWA, Satoshi OUCHI, Kunikazu ONISHI, Tomoto KAWAMURA
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Patent number: 8593928Abstract: The present invention provides a unit and method for implementing an optical head and optical drive device whose configuration is simple, and which allows the generation of a track error signal in which no offset is caused to occur. The optical drive device includes a light source for emitting light beams, an objective lens for converging the light beams onto an optical disc, an optical-signal generation element for dividing the light beams into at least four regions by using a division line extending in the radial direction of the optical disc, and a division line extending in the track direction of the optical disc, the light beams being reflected by the optical disc, and an optical detector for receiving the light beams divided by the optical-signal generation element, wherein the up and down or right and left areas of the four regions are made different from each other.Type: GrantFiled: May 3, 2012Date of Patent: November 26, 2013Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Tomoto Kawamura, Kotaro Oishi, Toshiteru Nakamura
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Patent number: 8537651Abstract: An optical disc device includes an optical source for emitting an optical beam, an incident intensity control circuit for controlling an intensity of the optical beam emitted from the optical source, an objective lens for focusing the optical beam on an optical disc, an optical detector for receiving the optical beam reflected from the optical disc, and a servo signal generation circuit for generating a focus error signal from the optical detector, by this configuration, the optical beam is varied once to a third optical beam intensity to be present in between a first optical beam intensity and a second optical beam intensity when varying from the first optical beam intensity up to the second optical beam intensity different from the first optical beam intensity, and the incident intensity control circuit is controlled such that the variation of focus error signal is not exceeded over a predetermined range.Type: GrantFiled: February 14, 2012Date of Patent: September 17, 2013Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Tomoto Kawamura, Kotaro Oishi, Masayuki Kobayashi, Hideo Suenaga
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Patent number: 8498190Abstract: An optical head capable of recording or playing back optical discs is provided. The optical disc comprises a light source to emit a beam, an objective to focus the beam on an optical disc, a beam dividing element having a plurality of divided areas with which to divide a cross section of the beam reflected from the optical disc, and a light detector to receive the beams divided by the beam dividing element, wherein the beam dividing element has in at least one of the plurality of areas an aberration imparting function of imparting an astigmatism or defocus aberration to a beam passing through that area.Type: GrantFiled: February 15, 2012Date of Patent: July 30, 2013Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Tomoto Kawamura, Hiroshi Ogasawara, Kotaro Oishi, Yoshio Okamoto