Patents by Inventor Kota Tokuda
Kota Tokuda 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: 11973316Abstract: [Object] To provide a vertical cavity surface emitting laser element and an electronic apparatus that have high light emission efficiency. [Solving Means] A vertical cavity surface emitting laser element according to the present technology includes: an active layer; a first cladding layer; and an intermediate layer. The first cladding layer is provided on the active layer. The intermediate layer is provided on the first cladding layer, electrons in the intermediate layer having potential higher than potential of electrons in the first cladding layer, holes in the intermediate layer having potential higher than potential of holes in the first cladding layer.Type: GrantFiled: February 20, 2019Date of Patent: April 30, 2024Assignee: SONY CORPORATIONInventors: Mikihiro Yokozeki, Rintaro Koda, Shunsuke Kono, Katsunori Yanashima, Kota Tokuda
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Patent number: 11929103Abstract: A disk device includes a magnetic disk, a magnetic head, a flexible printed circuit board, an electronic component, and a wall. The flexible printed circuit board is electrically connected to the magnetic head. The electronic component is mounted on the flexible printed circuit board. The wall has rigidity higher than the flexible printed circuit board and is attached to the flexible printed circuit board. The flexible printed circuit board with a first through hole includes a first surface facing the electronic component with a gap, and a second surface opposite the first surface and facing the wall, the first through hole being open to the first surface and the second surface to communicate with the gap. The wall is provided with a second through hole penetrating the wall to communicate with the first through hole.Type: GrantFiled: August 25, 2022Date of Patent: March 12, 2024Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Taichi Okano, Kiyokazu Ishizaki, Nobuhiro Yamamoto, Kota Tokuda, Hayato Yamaguchi
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Patent number: 11923661Abstract: A method of manufacturing a surface emitting laser according to an embodiment of the present disclosure includes the following two steps: (1) a step of forming a semiconductor stacked structure on a substrate, the semiconductor stacked structure including an active layer, a first DBR layer of a first electrical conduction type, and a second DBR layer of a second electrical conduction type, the first DBR layer and the second DBR layer sandwiching the active layer, the second electrical conduction type being different from the first electrical conduction type; and (2) a step of forming a mesa section at a portion on the second DBR layer side in the semiconductor stacked structure and then forming an annular diffusion region of the first electrical conduction type at an outer edge of the mesa section by impurity diffusion from a side surface of the mesa section, the mesa section including the second DBR layer, the mesa section not including the active layer.Type: GrantFiled: June 14, 2019Date of Patent: March 5, 2024Assignee: Sony Semiconductor Solutions CorporationInventors: Takayuki Kawasumi, Hideki Kimura, Kota Tokuda, Yoshiaki Watanabe
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Publication number: 20240071422Abstract: A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.Type: ApplicationFiled: October 18, 2023Publication date: February 29, 2024Inventors: Kota TOKUDA, Yoshihiro AMEMIYA, Shinra YAMANAKA, Nobuhiro YAMAMOTO, Taichi OKANO
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Publication number: 20240072514Abstract: The present technology provides a surface emitting laser capable of stabilizing emission characteristics against change in driving temperature. The present technology provides a surface emitting laser including: first and second multilayer film reflectors; a plurality of active regions stacked between the first and second multilayer film reflectors; and a tunnel junction disposed between at least one set of two adjacent active regions, in which the plurality of active regions includes at least two of the active regions in which peak wavelengths of emission spectra are different from each other. According to the present technology, a surface emitting laser capable of stabilizing emission characteristics against change in driving temperature is provided.Type: ApplicationFiled: February 4, 2022Publication date: February 29, 2024Inventor: Kota TOKUDA
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Publication number: 20240055833Abstract: The present technology provides a surface emitting laser capable of suppressing a decrease in luminous efficiency. The present technology provides a surface emitting laser including: first and second multilayer film reflectors; a plurality of active layers laminated together between the first and second multilayer film reflectors; a tunnel junction disposed between two active layers adjacent to each other in a lamination direction among the plurality of active layers; and an oxide confinement layer disposed between one active layer of the two adjacent active layers and the tunnel junction. According to the present technology, it is possible to provide a surface emitting laser capable of suppressing a decrease in luminous efficiency.Type: ApplicationFiled: January 6, 2022Publication date: February 15, 2024Inventors: Takahiro ARAKIDA, Shinichi AGATUMA, Rintaro KODA, Yasutaka HIGA, Osamu MAEDA, Kota TOKUDA
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Patent number: 11869543Abstract: According to one embodiment, a disk device includes a magnetic disk, a magnetic head, a first FPC, and a second FPC. The first FPC includes first terminals. The magnetic head is mounted on the first FPC and electrically connected to at least one of the first terminals. The second FPC includes a surface, second terminals on the surface, and a first ground plane. The second terminals are individually bonded to the corresponding first terminals with a conductive bonding material. The first ground plane covers at least one of the second terminals in a direction orthogonal to the surface. The second terminals include a first read terminal through which an electric signal representing information read from the magnetic disk by the magnetic head passes. The first ground plane is located apart from at least a part of the first read terminal in a direction along the surface.Type: GrantFiled: September 12, 2022Date of Patent: January 9, 2024Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Kota Tokuda, Nobuhiro Yamamoto, Taichi Okano, Yoshihiro Amemiya, Shinra Yamanaka
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Patent number: 11823717Abstract: A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.Type: GrantFiled: March 8, 2022Date of Patent: November 21, 2023Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Kota Tokuda, Yoshihiro Amemiya, Shinra Yamanaka, Nobuhiro Yamamoto, Taichi Okano
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Publication number: 20230206957Abstract: according to one embodiment, a disk device includes a magnetic disk, a magnetic head, a first FPC, and a second FPC. The first FPC includes first terminals. The magnetic head is mounted on the first FPC and electrically connected to at least one of the first terminals. The second FPC includes a surface, second terminals on the surface, and a first ground plane. The second terminals are individually bonded to the corresponding first terminals with a conductive bonding material. The first ground plane covers at least one of the second terminals in a direction orthogonal to the surface. The second terminals include a first read terminal through which an electric signal representing information read from the magnetic disk by the magnetic head passes. The first ground plane is located apart from at least a part of the first read terminal in a direction along the surface.Type: ApplicationFiled: September 12, 2022Publication date: June 29, 2023Inventors: Kota TOKUDA, Nobuhiro Yamamoto, Taichi Okano, Yoshihiro Amemiya, Shinra Yamanaka
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Patent number: 11688429Abstract: According to one embodiment, a disk device includes a housing including a hole, a magnetic disk, a control board closing the hole, and an electronic component. The electronic component is mounted on the control board, and assists a control operation for recording and reproducing information on and from the magnetic disk.Type: GrantFiled: March 10, 2021Date of Patent: June 27, 2023Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Taichi Okano, Jia Liu, Nobuhiro Yamamoto, Kota Tokuda
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Patent number: 11682825Abstract: A disk device includes a housing having a sidewall, the side wall having a first through-hole; a magnetic disk rotatably disposed in the housing and surrounded by the sidewall in a radial direction; a flexible printed circuit electrically connected to the magnetic disk; an insulator closing the first through-hole; a wireless communication device having a first communication antenna inside the housing; and a control board electrically connected to the flexible printed circuit. The control board is supplied with power from outside of the housing via a first connector, and is configured to receive a write command or a read command via the first communication antenna.Type: GrantFiled: April 21, 2022Date of Patent: June 20, 2023Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Jia Liu, Taichi Okano, Kota Tokuda, Nobuhiro Yamamoto
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Publication number: 20230096932Abstract: A surface emitting laser according to one embodiment of the present disclosure includes a mesa part including, in order, a first conductivity-type DBR layer, an active layer, a second conductivity-type DBR layer, and a second conductivity-type contact layer. The surface emitting laser further includes: a first conductivity-type contact layer provided in a region on the first conductivity-type DBR layer side in a positional relationship with respect to the mesa part; a first conductivity-type semiconductor layer that is disposed at a position opposed to the mesa part with the first conductivity-type contact layer interposed therebetween, and is in contact with the first conductivity-type contact layer, the first conductivity-type semiconductor layer having a lower impurity concentration than the first conductivity-type contact layer; a first electrode layer in contact with the first conductivity-type contact layer; and a second electrode layer in contact with the second conductivity-type contact layer.Type: ApplicationFiled: February 17, 2021Publication date: March 30, 2023Inventors: KOTA TOKUDA, OSAMU MAEDA, YOSHIHIKO TAKAHASHI, KAZUHIKO TAKAHASHI
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Publication number: 20230062571Abstract: A disk device according to one embodiment includes a magnetic disk, a magnetic head, and a flexible printed circuit board. The flexible printed circuit board is electrically connected to the magnetic head. The flexible printed circuit board includes a first layer, a second layer having conductive property, and a third layer having insulation property. The first layer includes a first surface having insulation property. The second layer overlays the first surface, and includes a first conductor and a second conductor spaced from the first conductor. The third layer covers at least a part of the first surface and at least a part of the second layer. The flexible printed circuit board is provided with a first hole that is located between the first conductor and the second conductor with spacing from the second layer and penetrates the third layer.Type: ApplicationFiled: March 8, 2022Publication date: March 2, 2023Inventors: Kota TOKUDA, Yoshihiro AMEMIYA, Shinra YAMANAKA, Nobuhiro YAMAMOTO, Taichi OKANO
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Publication number: 20230061850Abstract: A disk device includes a magnetic disk, a magnetic head, a flexible printed circuit board, an electronic component, and a wall. The flexible printed circuit board is electrically connected to the magnetic head. The electronic component is mounted on the flexible printed circuit board. The wall has rigidity higher than the flexible printed circuit board and is attached to the flexible printed circuit board. The flexible printed circuit board with a first through hole includes a first surface facing the electronic component with a gap, and a second surface opposite the first surface and facing the wall, the first through hole being open to the first surface and the second surface to communicate with the gap. The wall is provided with a second through hole penetrating the wall to communicate with the first through hole.Type: ApplicationFiled: August 25, 2022Publication date: March 2, 2023Inventors: Taichi OKANO, Kiyokazu ISHIZAKI, Nobuhiro YAMAMOTO, Kota TOKUDA, Hayato YAMAGUCHI
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Patent number: 11562770Abstract: According to one embodiment, a disk device includes a housing, recording medium, a magnetic head, an internal wireless communication device, and an internal component. The housing has an internal space. The internal wireless communication device generates at least either of: an electric signal representing information to be written to the recording medium, the electric signal corresponding to light, a magnetic field, or an electric field generated by an external wireless communication device; and light, a magnetic field, or an electric field toward the external wireless communication device, the light, the magnetic field, or the electric field corresponding to an electric signal representing information read from the recording medium.Type: GrantFiled: September 8, 2021Date of Patent: January 24, 2023Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Taichi Okano, Masahide Takazawa, Jai Liu, Nobuhiro Yamamoto, Kota Tokuda
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Publication number: 20220301595Abstract: A disk device according to one embodiment includes a first conversion device, a second conversion device, an optical waveguide, a first component, and a second component. The first conversion device emits light corresponding to an electric signal. The second conversion device generates an electric signal corresponding to incident light. The optical waveguide includes a first end joined to the first conversion device and a second end joined to the second conversion device, and transmits light emitted from the first conversion device to the second conversion device. The first component is electrically connected to the first conversion device. The second component is electrically connected to the second conversion device, and communicates with the first component through the first conversion device, the optical waveguide, and the second conversion device.Type: ApplicationFiled: September 8, 2021Publication date: September 22, 2022Inventors: Taichi OKANO, Jia LIU, Masahide TAKAZAWA, Nobuhiro TAKAZAWA, Kota TOKUDA
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Publication number: 20220301591Abstract: According to one embodiment, a disk device includes a housing, recording medium, a magnetic head, an internal wireless communication device, and an internal component. The housing has an internal space. The internal wireless communication device generates at least either of: an electric signal representing information to be written to the recording medium, the electric signal corresponding to light, a magnetic field, or an electric field generated by an external wireless communication device; and light, a magnetic field, or an electric field toward the external wireless communication device, the light, the magnetic field, or the electric field corresponding to an electric signal representing information read from the recording medium.Type: ApplicationFiled: September 8, 2021Publication date: September 22, 2022Inventors: Taichi OKANO, Masahide TAKAZAWA, Jai LIU, Nobuhiro YAMAMOTO, Kota TOKUDA
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Patent number: 11437076Abstract: According to one embodiment, a disk device includes a housing having a first transmission hole, a magnetic disk, a head, a first sealing material having an inner surface and an outer surface and closing the first transmission hole, and a first wireless power feeding device having a first power feeding antenna. The first power feeding antenna is located mere inward of the housing than the outer surface of the first sealing material, and receives power transmitted through the first sealing material by wireless power feeding.Type: GrantFiled: September 9, 2020Date of Patent: September 6, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Taichi Okano, Jia Liu, Nobuhiro Yamamoto, Kota Tokuda
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Patent number: 11410691Abstract: According to one embodiment, a wiring board unit includes a reinforcing board, a flexible printed circuit board includes a joint portion including a first plane and a second plane and attached on the reinforcing board, a relay unit extending from the first plane, a plurality of connection pad groups located on one of the first plane and the second plane and a first IC chip mounted on the first plane, and the joint portion is bent on a boundary between the first plane and the second plane.Type: GrantFiled: April 5, 2021Date of Patent: August 9, 2022Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Kota Tokuda, Nobuhiro Yamamoto, Yousuke Hisakuni
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Publication number: 20220247153Abstract: A surface light-emission laser device includes: an active layer; a first DBR layer and a second DBR layer that interpose the active layer therebetween; and an insulation film and a metal layer that are provided at a position that faces a light-emission region of the active layer, and correspond to an end part of a reflection mirror on the second DBR layer side as viewed from the active layer. The surface light-emission laser device further includes: a first contact layer provided in the first DBR layer or in contact with the first DBR layer; a second contact layer provided in contact with the second DBR layer; a first electrode layer provided in contact with the first contact layer; and a second electrode layer that is in contact with the second contact layer, and provided at a position that does not face the light-emission region of the active layer.Type: ApplicationFiled: October 20, 2020Publication date: August 4, 2022Inventors: Osamu MAEDA, Kazuhiko TAKAHASHI, Yoshihiko TAKAHASHI, Kota TOKUDA, Jugo MITOMO, Takahiro ARAKIDA