Patents by Inventor Yasutaka Imai
Yasutaka Imai 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: 11947249Abstract: A light emitting apparatus according to the present disclosure includes a first layer made of a semiconductor monocrystal, a second layer provided at the first layer and having a crystal orientation not continuous with the crystal orientation of the first layer, and a columnar crystal structure including a light emitting layer and extending from the second layer.Type: GrantFiled: September 22, 2021Date of Patent: April 2, 2024Assignee: SEIKO EPSON CORPORATIONInventors: Takafumi Noda, Hideki Hahiro, Tetsuji Fujita, Atsushi Ito, Koichiro Akasaka, Yasutaka Imai, Michifumi Nagawa
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Publication number: 20220093827Abstract: A light emitting apparatus according to the present disclosure includes a first layer made of a semiconductor monocrystal, a second layer provided at the first layer and having a crystal orientation not continuous with the crystal orientation of the first layer, and a columnar crystal structure including a light emitting layer and extending from the second layer.Type: ApplicationFiled: September 22, 2021Publication date: March 24, 2022Inventors: Takafumi NODA, Hideki HAHIRO, Tetsuji FUJITA, Atsushi ITO, Koichiro AKASAKA, Yasutaka IMAI, Michifumi NAGAWA
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Patent number: 11177316Abstract: A method of manufacturing a light source device includes the steps of providing a mask layer to a substrate, providing the mask layer with a plurality of first openings and at least one second opening, and growing columnar parts having a light emitting section from the plurality of first openings, and growing a structure from the second opening.Type: GrantFiled: February 26, 2020Date of Patent: November 16, 2021Inventors: Tetsuji Fujita, Yasutaka Imai, Koichiro Akasaka, Hideki Hahiro, Michifumi Nagawa
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Patent number: 11063171Abstract: A light emitting device includes a substrate, and a laminated structure provided on the substrate, wherein the laminated structure has a plurality of columnar portions, the columnar portion contains a material having a wurtzite-type crystal structure, in a plan view as seen from a layered direction of the laminated structure, the plurality of columnar portions are arranged in a square lattice form or rectangular lattice form, a line passing through centers of the adjacent columnar portions is inclined relative to m-planes of the columnar portions located between the centers of the adjacent columnar portions, and vertices of the adjacent columnar portions are not placed on the line.Type: GrantFiled: March 31, 2020Date of Patent: July 13, 2021Inventors: Yasutaka Imai, Tetsuji Fujita, Koichiro Akasaka, Hideki Hahiro
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Patent number: 11061311Abstract: A light emitter including a base, a light source that outputs light, and a phosphor that is provided in a form of a film at a first surface of the base and emits light when irradiated with the light outputted from the light source. A second surface of the phosphor that is a surface opposite the base has an irregular shape, and the light source radiates the light obliquely with respect to the irregular shape.Type: GrantFiled: May 22, 2018Date of Patent: July 13, 2021Inventor: Yasutaka Imai
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Patent number: 10942432Abstract: A light emitting apparatus including a base, a light source, and a plurality of columnar sections that are provided at the base and each include a first phosphor that emits light when irradiated with light emitted from the light source, in which the light source radiates the light to the columnar sections obliquely with respect thereto.Type: GrantFiled: May 22, 2018Date of Patent: March 9, 2021Assignee: SEIKO EPSON CORPORATIONInventor: Yasutaka Imai
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Publication number: 20200313032Abstract: A light emitting device includes a substrate, and a laminated structure provided on the substrate, wherein the laminated structure has a plurality of columnar portions, the columnar portion contains a material having a wurtzite-type crystal structure, in a plan view as seen from a layered direction of the laminated structure, the plurality of columnar portions are arranged in a square lattice form or rectangular lattice form, a line passing through centers of the adjacent columnar portions is inclined relative to m-planes of the columnar portions located between the centers of the adjacent columnar portions, and vertices of the adjacent columnar portions are not placed on the line.Type: ApplicationFiled: March 31, 2020Publication date: October 1, 2020Inventors: Yasutaka IMAI, Tetsuji FUJITA, Koichiro AKASAKA, Hideki HAHIRO
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Publication number: 20200292928Abstract: A light emitting apparatus including a base, a light source, and a plurality of columnar sections that are provided at the base and each include a first phosphor that emits light when irradiated with light emitted from the light source, in which the light source radiates the light to the columnar sections obliquely with respect thereto.Type: ApplicationFiled: May 22, 2018Publication date: September 17, 2020Applicant: SEIKO EPSON CORPORATIONInventor: Yasutaka IMAI
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Publication number: 20200273908Abstract: A method of manufacturing a light source device includes the steps of providing a mask layer to a substrate, providing the mask layer with a plurality of first openings and at least one second opening, and growing columnar parts having a light emitting section from the plurality of first openings, and growing a structure from the second opening.Type: ApplicationFiled: February 26, 2020Publication date: August 27, 2020Inventors: Tetsuji Fujita, Yasutaka Imai, Koichiro Akasaka, Hideki Hahiro, Michifumi Nagawa
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Publication number: 20200142289Abstract: A light emitter including a base, a light source that outputs light, and a phosphor that is provided in a form of a film at a first surface of the base and emits light when irradiated with the light outputted from the light source. A second surface of the phosphor that is a surface opposite the base has an irregular shape, and the light source radiates the light obliquely with respect to the irregular shape.Type: ApplicationFiled: May 22, 2018Publication date: May 7, 2020Inventor: Yasutaka IMAI
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Publication number: 20200067271Abstract: A projector includes a laser light source, and a light modulating element that modulates light emitted from the laser light source in accordance with image information. The laser light source includes a substrate, and a photonic crystal structure that includes a light emitting layer that emits light, and causes the light emitted by the light emitting layer to be confined in an in-plane direction of the substrate and be emitted in a normal direction of the substrate.Type: ApplicationFiled: August 21, 2019Publication date: February 27, 2020Inventors: Koichiro AKASAKA, Hiroki NISHIOKA, Shunsuke ISHIZAWA, Takafumi NODA, Yasutaka IMAI, Katsumi KISHINO, Hiroyasu KASEYA, Tsuyoshi KANEKO
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Patent number: 10224943Abstract: An atomic oscillator includes a gas cell housing alkali metal atoms, a light source providing light to the gas cell, and a light detector that detects an amount of light transmitted through the gas cell. The light source includes a substrate, a first mirror layer on an upper portion of the substrate, an active layer on an upper portion of the first mirror layer, a second mirror layer on an upper portion of the active layer, a first contact layer on an upper portion of the second mirror layer, a light absorption layer on an upper portion of the first contact layer, and a second contact layer on an upper portion of the light absorption layer. As such, an output wavelength and the light output of the light source can be independently adjusted.Type: GrantFiled: October 10, 2016Date of Patent: March 5, 2019Assignee: Seiko Epson CorporationInventor: Yasutaka Imai
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Publication number: 20170117909Abstract: An atomic oscillator includes: a gas cell sealing alkali metal atoms; a light source emitting light to the gas cell; and a light detection unit detecting a light amount of light transmitted through the gas cell, in which the light source includes a substrate, a first mirror layer disposed on an upper portion of the substrate, an active layer disposed on an upper portion of the first mirror layer, a second mirror layer disposed on an upper portion of the active layer, a first contact layer disposed on an upper portion of the second mirror layer, a light absorption layer disposed on an upper portion of the first contact layer, and a second contact layer disposed on an upper portion of the light absorption layer.Type: ApplicationFiled: October 10, 2016Publication date: April 27, 2017Inventor: Yasutaka IMAI
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Publication number: 20170062652Abstract: A light emitting device includes an active layer capable of producing light when current is injected thereinto, a first cladding layer and a second cladding layer that sandwich the active layer, a first electrode electrically connected to the first cladding layer, and a second electrode electrically connected to the second cladding layer. The active layer forms an optical waveguide that guides the light produced in the active layer. The optical waveguide has a window section that is provided in an end portion of the optical waveguide and has a band gap wider than the band gap of the active layer. The carrier concentration of a first layer provided between the window section and the second electrode is lower than the carrier concentration of the second cladding layer.Type: ApplicationFiled: August 18, 2016Publication date: March 2, 2017Inventor: Yasutaka IMAI
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Patent number: 9231377Abstract: A vertical cavity surface emitting laser includes: a substrate; and a laminated body which is provided over the substrate, wherein the laminated body includes a first mirror layer, an active layer, and a second mirror layer, in a plan view, the laminated body includes a first distortion imparting portion, a second distortion imparting portion, and a resonance portion which is provided between the first distortion imparting portion and the second distortion imparting portion and resonates light generated by the active layer, and an angle formed by a side surface of the first distortion imparting portion and an upper surface of the substrate, and an angle formed by a side surface of the second distortion imparting portion and the upper surface of the substrate are greater than an angle formed by a side surface of the resonance portion and the upper surface of the substrate.Type: GrantFiled: December 18, 2014Date of Patent: January 5, 2016Assignee: Seiko Epson CorporationInventor: Yasutaka Imai
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Publication number: 20150180211Abstract: A vertical cavity surface emitting laser includes: a substrate; and a laminated body which is provided over the substrate, wherein the laminated body includes a first mirror layer, an active layer, and a second mirror layer, in a plan view, the laminated body includes a first distortion imparting portion, a second distortion imparting portion, and a resonance portion which is provided between the first distortion imparting portion and the second distortion imparting portion and resonates light generated by the active layer, and an angle formed by a side surface of the first distortion imparting portion and an upper surface of the substrate, and an angle formed by a side surface of the second distortion imparting portion and the upper surface of the substrate are greater than an angle formed by a side surface of the resonance portion and the upper surface of the substrate.Type: ApplicationFiled: December 18, 2014Publication date: June 25, 2015Inventor: Yasutaka IMAI
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Publication number: 20150180206Abstract: A vertical cavity surface emitting laser includes: a substrate; and a laminated body which is provided over the substrate, wherein, in a plan view, the laminated body includes a first distortion imparting portion, a second distortion imparting portion, and a resonance portion which is provided between the first distortion imparting portion and the second distortion imparting portion and resonates light generated in the laminated body, and the laminated body includes a first mirror layer which is provided over the substrate, an active layer which is provided over the first mirror layer, a second mirror layer which is provided over the active layer, and a contact layer which is provided over the second mirror layer of the resonance portion, except for a portion over the second mirror layer of the first distortion imparting portion and for a portion over the second mirror layer of the second distortion imparting portion.Type: ApplicationFiled: December 19, 2014Publication date: June 25, 2015Inventor: Yasutaka IMAI
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Publication number: 20140192330Abstract: An illumination device includes: a light emitting element that includes an active layer, a first clad layer and a second clad layer with the active layer interposed therebetween, and a first gain region and a second gain region generating light when a current flows through the active layer; a control unit that operates the light emitting element so that light is alternately generated in the first gain region and the second gain region; and a first lens to which light emitted from a first light emitting portion of the first gain region and light emitted from a second light emitting portion of the second gain region are incident, wherein the light emitted from the first light emitting portion and the light emitted from the second light emitting portion are emitted in the same direction and are incident to the first lens.Type: ApplicationFiled: January 7, 2014Publication date: July 10, 2014Applicant: Seiko Epson CorporationInventor: Yasutaka Imai
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Patent number: 8629461Abstract: A light emitting device includes: a light emitting unit and a light receiving unit which are provided on a same substrate, wherein the light emitting unit includes an active layer sandwiched between a first clad layer and a second clad layer, a first electrode electrically connected to the first clad layer, and a second electrode electrically connected to the second clad layer.Type: GrantFiled: December 4, 2012Date of Patent: January 14, 2014Assignee: Seiko Epson CorporationInventor: Yasutaka Imai
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Patent number: 8344393Abstract: A light receiving and emitting device includes: a light emitting unit and a light receiving unit which are provided on a same substrate, wherein the light emitting unit includes an active layer sandwiched between a first clad layer and a second clad layer, a first electrode electrically connected to the first clad layer, and a second electrode electrically connected to the second clad layer, the light receiving unit includes a light-absorbing layer, at least part of the active layer forms a gain region on a current path between the first electrode and the second electrode, the gain region is provided from a first side face of the active layer to a second side face parallel to the first side face so as to be inclined with respect to a perpendicular of the first side face as seen in a planar view, a light generated in the gain region is divided, at least one of an edge face on the first side face and an edge face on the second side face, the edge faces of the gain region, into a light emitted to an outside andType: GrantFiled: April 26, 2010Date of Patent: January 1, 2013Assignee: Seiko Epson CorporationInventor: Yasutaka Imai