Patents by Inventor Yasumasa Sawai

Yasumasa Sawai 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: 10775684
    Abstract: An optical unit that directs illumination light to a plurality of digital micromirror devices that produce projection light by modulating the illumination light on an image display surface according to an image signal, and that transmits and emits the projection light, the optical unit includes: a plurality of first prisms, wherein the projection light exits a first face of a most emergence-side first prism among the first prisms; and a second prism disposed next to the first prisms, wherein the second prism includes: a 2A-th face into which the projection light enters; and a 2B-th face disposed perpendicular to an optical axis of the projection light, the projection light exits the 2B-th face, the second prism is wedge-shaped with the 2A-th and 2B-th faces not being in parallel with each other.
    Type: Grant
    Filed: May 3, 2019
    Date of Patent: September 15, 2020
    Assignee: Konica Minolta, Inc.
    Inventors: Yasumasa Sawai, Masahiro Terada, Masayuki Imaoka, Sadanobu Imamura
  • Publication number: 20200135867
    Abstract: A semiconductor device includes a first conductor; a first insulator thereover; a first oxide thereover; a second oxide thereover; a second conductor and a third conductor that are separate from each other thereover; a third oxide over the first insulator, the second oxide, the second conductor, and the third conductor; a second insulator thereover; a fourth conductor thereover; and a third insulator over the first insulator, the second insulator, and the fourth conductor. The second oxide includes a region where the energy of the conduction band minimum of an energy band is low and a region where the energy of the conduction band minimum of the energy band is high. The energy of the conduction band minimum of the third oxide is higher than that of the region of the second oxide where the energy of the conduction band minimum is low. Side surfaces of the first oxide and the second oxide are covered with the third oxide.
    Type: Application
    Filed: January 2, 2020
    Publication date: April 30, 2020
    Inventors: Tsutomu MURAKAWA, Toshihiko TAKEUCHI, Hiroki KOMAGATA, Hiromi SAWAI, Yasumasa YAMANE, Shota SAMBONSUGE, Kazuya SUGIMOTO, Shunpei YAMAZAKI
  • Patent number: 10600875
    Abstract: A semiconductor device includes a first conductor; a first insulator thereover; a first oxide thereover; a second oxide thereover; a second conductor and a third conductor that are separate from each other thereover; a third oxide over the first insulator, the second oxide, the second conductor, and the third conductor; a second insulator thereover; a fourth conductor thereover; and a third insulator over the first insulator, the second insulator, and the fourth conductor. The second oxide includes a region where the energy of the conduction band minimum of an energy band is low and a region where the energy of the conduction band minimum of the energy band is high. The energy of the conduction band minimum of the third oxide is higher than that of the region of the second oxide where the energy of the conduction band minimum is low. Side surfaces of the first oxide and the second oxide are covered with the third oxide.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: March 24, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Tsutomu Murakawa, Toshihiko Takeuchi, Hiroki Komagata, Hiromi Sawai, Yasumasa Yamane, Shota Sambonsuge, Kazuya Sugimoto, Shunpei Yamazaki
  • Patent number: 10578845
    Abstract: An illumination optical system includes a lens group, a diaphragm, and a prism unit including first to third prisms and a rotationally-asymmetrical curved reflective surface having a positive power and satisfying the conditional formula: PYa/PZa<PYb/PZb, where Pya, Pyb represent powers of the curved reflective surface at positions of points a, b, respectively within a reference plane formed in the prism unit by rays passing through centers of the lens group and the diaphragm, and PZa, PZb represent powers of the curved reflective surface at positions of points a, b, respectively, within a plane including normal lines of the reference plane and the curved reflective surface, points a and b representing where the principal ray of a beam illuminating the area nearest and farthest, respectively, to the lens group impinges on the curved reflective surface, along an intersection line between an image display surface and the reference plane.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: March 3, 2020
    Assignee: Konica Minolta, Inc.
    Inventors: Masayuki Imaoka, Yasumasa Sawai
  • Patent number: 10481309
    Abstract: A prism unit includes a first prism and a second prism. The first prism includes a first optical surface that allows the illumination light to enter the prism, a second optical surface that reflects the illumination light that entered through the first optical surface, and a third optical surface that allows the illumination light reflected by the second optical surface to exit the prism. The second prism includes a fourth optical surface that forms a first air gap with the second optical surface and allows the illumination light that exited through the second optical surface to enter the prism, and a fifth optical surface that allows the illumination light that entered through the fourth optical surface to exit the prism.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: November 19, 2019
    Assignee: Konica Minolta, Inc.
    Inventor: Yasumasa Sawai
  • Publication number: 20190258145
    Abstract: An optical unit that directs illumination light to a plurality of digital micromirror devices that produce projection light by modulating the illumination light on an image display surface according to an image signal, and that transmits and emits the projection light, the optical unit includes: a plurality of first prisms, wherein the projection light exits a first face of a most emergence-side first prism among the first prisms; and a second prism disposed next to the first prisms, wherein the second prism includes: a 2A-th face into which the projection light enters; and a 2B-th face disposed perpendicular to an optical axis of the projection light, the projection light exits the 2B-th face, the second prism is wedge-shaped with the 2A-th and 2B-th faces not being in parallel with each other.
    Type: Application
    Filed: May 3, 2019
    Publication date: August 22, 2019
    Applicant: Konica Minolta, Inc.
    Inventors: Yasumasa Sawai, Masahiro Terada, Masayuki Imaoka, Sadanobu Imamura
  • Patent number: 10324362
    Abstract: In an optical unit, illumination light is directed to a plurality of digital micromirror devices that produce projection light by modulating the illumination light on an image display surface according to an image signal. The optical unit emits the projection light produced by the digital micromirror devices. The optical unit includes: a reflector having an illumination light reflecting face on which the illumination light is reflected; and a prism unit composed of a plurality of first prisms. The reflected illumination light enters the prism unit via a first face of a most emergence-side first prism among the first prisms and the projection light exits via the first face.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: June 18, 2019
    Assignee: Konica Minolta, Inc.
    Inventors: Yasumasa Sawai, Masahiro Terada, Masayuki Imaoka, Sadanobu Imamura
  • Publication number: 20190011813
    Abstract: In an optical unit, illumination light is directed to a plurality of digital micromirror devices that produce projection light by modulating the illumination light on an image display surface according to an image signal. The optical unit emits the projection light produced by the digital micromirror devices. The optical unit includes: a reflector having an illumination light reflecting face on which the illumination light is reflected; and a prism unit composed of a plurality of first prisms. The reflected illumination light enters the prism unit via a first face of a most emergence-side first prism among the first prisms and the projection light exits via the first face.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Applicant: Konica Minolta, Inc.
    Inventors: Yasumasa Sawai, Masahiro Terada, Masayuki Imaoka, Sadanobu Imamura
  • Patent number: 10145988
    Abstract: A projection lens included in a projector using laser beams as a light source is provided, the laser beams including as the light source, first blue laser light beams, second blue laser beams, first green laser beams, second green laser beams, first red laser beams, and second red laser beams, which are different in wavelength range. The projection lens has a relative maximum value of a transmittance on an optical axis between a wavelength not shorter than 645 nm and a wavelength not longer than 680 nm.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: December 4, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Miyuki Teramoto, Yasumasa Sawai, Koji Takahara
  • Publication number: 20180188512
    Abstract: An illumination optical system includes a lens group, a diaphragm, and a prism unit including first to third prisms and a rotationally-asymmetrical curved reflective surface having a positive power and satisfying the conditional formula: PYa/PZa<PYb/PZb, where Pya, Pyb represent powers of the curved reflective surface at positions of points a, b, respectively within a reference plane formed in the prism unit by rays passing through centers of the lens group and the diaphragm, and PZa, PZb represent powers of the curved reflective surface at positions of points a, b, respectively, within a plane including normal lines of the reference plane and the curved reflective surface, points a and b representing where the principal ray of a beam illuminating the area nearest and farthest, respectively, to the lens group impinges on the curved reflective surface, along an intersection line between an image display surface and the reference plane.
    Type: Application
    Filed: June 22, 2016
    Publication date: July 5, 2018
    Inventors: Masayuki IMAOKA, Yasumasa SAWAI
  • Patent number: 9952424
    Abstract: In a reflection-type image display for use in an image projection apparatus, when normal vectors of a pixel reflection surface in image display and non-display states are VA and VB, respectively, a Y axis is set in a normal direction of an image display surface with the pixel center as an origin, an X axis is set in a direction perpendicular to the Y axis and the normal vector VA, and a projection of the vector VB onto an XY plane is vb, the projection vb is at a predetermined angle not parallel to the Y axis, and among projections of illumination light incident on the pixel reflection surfaces onto the XY plane, a projection forming a maximum angle with respect to the Y axis exists only on a side with respect to the Y axis where a region in which the projection vb exists lies.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: April 24, 2018
    Assignee: Konica Minolta, Inc.
    Inventor: Yasumasa Sawai
  • Publication number: 20180059293
    Abstract: A prism unit includes a first prism and a second prism. The first prism includes a first optical surface that allows the illumination light to enter the prism, a second optical surface that reflects the illumination light that entered through the first optical surface, and a third optical surface that allows the illumination light reflected by the second optical surface to exit the prism. The second prism includes a fourth optical surface that forms a first air gap with the second optical surface and allows the illumination light that exited through the second optical surface to enter the prism, and a fifth optical surface that allows the illumination light that entered through the fourth optical surface to exit the prism.
    Type: Application
    Filed: February 16, 2016
    Publication date: March 1, 2018
    Applicant: Konica Minolta, Inc.
    Inventor: Yasumasa SAWAI
  • Patent number: 9874806
    Abstract: A color splitting/combining prism splits apart illumination light from a projector and combines together projection light from the projector. A part of the illumination light that is not used as the projection light passes through the color splitting/combining prism as OFF-light via an image display element in a direction different from the projection light. The color splitting/combining prism includes a dichroic film of which a cutoff wavelength, at which the dichroic film exhibits a transmittance of 50% when splitting two different colors between reflection and transmission, is provided in a wavelength range in which wavelength separation is possible for all of the illumination light, the projection light, and the OFF-light that are incident at different incidence angles respectively.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: January 23, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Koji Takahara, Yasumasa Sawai
  • Patent number: 9866806
    Abstract: A prism unit that combines light in the three primary colors of R, G, and B on the same optical axis includes: a G-reflecting dichroic coating that reflects G light and passes R and B light; and an RB dichroic coating that reflects one of R and B, and passes the other one of R and B, the prism unit satisfying the following conditional expression: ?rg??rb?0.67×?rg+0.33×?gb, where ?gb represents the wavelength at which the transmittance is 50% when the colors of G and B on the composite optical axis are combined, ?rg represents the wavelength at which the transmittance is 50% when the colors of R and G on the composite optical axis are combined, and ?rb represents the wavelength at which the transmittance is 50% when the colors of R and B on the composite optical axis are combined.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: January 9, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Miyuki Teramoto, Yasumasa Sawai, Koji Takahara, Masahiro Terada
  • Patent number: 9612516
    Abstract: A projection type image display apparatus (1) comprises a focus correction system (30). The system includes a temperature detection mechanism (16) for measuring temperature in the vicinity of a projection lens group (13), a correction amount calculation unit (18) for calculating a correction amount for correcting the focus shift caused by a temperature change, and a driving signal generation unit (19) for generating, based on the correction amount, a driving signal for driving a focus adjustment mechanism (15). If the user performs a focus adjustment using a focus operation input unit (23), a focus operation determination unit (21) determines that a focus adjustment has occurred independently of the focus correction system and changes a correction condition stored in a memory (20).
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: April 4, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Norio Maeda, Kohei Wataru, Kazuhiko Inoue, Masahiro Terada, Takashi Ohta, Yasumasa Sawai
  • Publication number: 20170010459
    Abstract: In a reflection-type image display for use in an image projection apparatus, when normal vectors of a pixel reflection surface in image display and non-display states are VA and VB, respectively, a Y axis is set in a normal direction of an image display surface with the pixel center as an origin, an X axis is set in a direction perpendicular to the Y axis and the normal vector VA, and a projection of the vector VB onto an XY plane is vb, the projection vb is at a predetermined angle not parallel to the Y axis, and among projections of illumination light incident on the pixel reflection surfaces onto the XY plane, a projection forming a maximum angle with respect to the Y axis exists only on a side with respect to the Y axis where a region in which the projection vb exists lies.
    Type: Application
    Filed: February 27, 2015
    Publication date: January 12, 2017
    Applicant: Konica Minolta, Inc.
    Inventor: Yasumasa Sawai
  • Publication number: 20160363851
    Abstract: A color splitting/combining prism splits apart illumination light from a projector and combines together projection light from the projector. A part of the illumination light that is not used as the projection light passes through the color splitting/combining prism as OFF-light via an image display element in a direction different from the projection light. The color splitting/combining prism includes a dichroic film of which a cutoff wavelength, at which the dichroic film exhibits a transmittance of 50% when splitting two different colors between reflection and transmission, is provided in a wavelength range in which wavelength separation is possible for all of the illumination light, the projection light, and the OFF-light that are incident at different incidence angles respectively.
    Type: Application
    Filed: August 26, 2016
    Publication date: December 15, 2016
    Applicant: Konica Minolta, Inc.
    Inventors: Koji Takahara, Yasumasa Sawai
  • Publication number: 20160277718
    Abstract: A projection lens included in a projector using laser beams as a light source is provided, the laser beams including as the light source, first blue laser light beams, second blue laser beams, first green laser beams, second green laser beams, first red laser beams, and second red laser beams, which are different in wavelength range. The projection lens has a relative maximum value of a transmittance on an optical axis between a wavelength not shorter than 645 nm and a wavelength not longer than 680 nm.
    Type: Application
    Filed: March 16, 2016
    Publication date: September 22, 2016
    Applicant: Konica Minolta, Inc.
    Inventors: Miyuki Teramoto, Yasumasa Sawai, Koji Takahara
  • Publication number: 20160085081
    Abstract: A prism unit that combines light in the three primary colors of R, G, and B on the same optical axis includes: a G-reflecting dichroic coating that reflects G light and passes R and B light; and an RB dichroic coating that reflects one of R and B, and passes the other one of R and B, the prism unit satisfying the following conditional expression: ?rg??rb?0.67×?rg+0.33×?gb, where ?gb represents the wavelength at which the transmittance is 50% when the colors of G and B on the composite optical axis are combined, ?rg represents the wavelength at which the transmittance is 50% when the colors of R and G on the composite optical axis are combined, and ?rb represents the wavelength at which the transmittance is 50% when the colors of R and B on the composite optical axis are combined.
    Type: Application
    Filed: September 21, 2015
    Publication date: March 24, 2016
    Applicant: Konica Minolta Inc.
    Inventors: Miyuki Teramoto, Yasumasa Sawai, Koji Takahara, Masahiro Terada
  • Publication number: 20150153638
    Abstract: A projection type image display apparatus (1) comprises a focus correction system (30). The system includes a temperature detection mechanism (16) for measuring temperature in the vicinity of a projection lens group (13), a correction amount calculation unit (18) for calculating a correction amount for correcting the focus shift caused by a temperature change, and a driving signal generation unit (19) for generating, based on the correction amount, a driving signal for driving a focus adjustment mechanism (15). If the user performs a focus adjustment using a focus operation input unit (23), a focus operation determination unit (21) determines that a focus adjustment has occurred independently of the focus correction system and changes a correction condition stored in a memory (20).
    Type: Application
    Filed: February 9, 2015
    Publication date: June 4, 2015
    Inventors: Norio Maeda, Kohei Wataru, Kazuhiko Inoue, Masahiro Terada, Takashi Ohta, Yasumasa Sawai