公开(公告)号：US20250002177A1

公开(公告)日：2025-01-02

申请号：US18594564

申请日：2024-03-04

Applicant: Hitachi, Ltd.

Inventor： Yosuke TANABE ,  Tsukasa FUNANE ,  Koichi WATANABE ,  Hisatoshi KIMURA ,  Makoto ITO

IPC: B64G1/22 ,  B64G1/66 ,  H01Q1/08 ,  H01Q1/28

Abstract: A stereostructure spacecraft of the present invention comprises multiple deployable beam members, multiple tension members, and a spacecraft for storing the deployable beam members and the tension members. The stereostructure spacecraft is formed by deploying the deployable beam members and the tension members around the spacecraft. The deployable beam members stored in the spacecraft are deployed and arranged equidistantly in directions of multiple rotational symmetry axes, the rotational symmetry axes being rotational symmetry axes of a virtual polyhedron that is formed to have a substantial center of the spacecraft as an origin. The tension members support two end portions of two adjacent deployable beam members with tension. The respective end portions of the deployable beam members are simultaneously supported by three or more of the tension members.

公开(公告)号：US20240340078A1

公开(公告)日：2024-10-10

申请号：US18596139

申请日：2024-03-05

Applicant: Hitachi, Ltd.

Inventor： Hisatoshi KIMURA ,  Tsukasa FUNANE ,  Yosuke TANABE ,  Makoto ITO ,  Koichi WATANABE

IPC: H04B7/185 ,  B64G1/40 ,  H04W64/00

CPC classification number: H04B7/18521 ,  B64G1/40 ,  H04B7/18526 ,  H04W64/006

Abstract: An artificial satellite system according to the present invention includes first and second artificial satellites. An antenna of the first satellite transmits a radio wave (transmission signal) to the second satellite. An antenna of the second satellite receives the transmission signal. A software defined radio of the second satellite generates a signal having the same frequency and phase as the transmission signal has. The antenna of the second satellite transmits a radio wave of a signal generated by the second satellite to the first satellite. The antenna of the first satellite receives the radio wave (reception signal) transmitted by the second satellite. A data processing device of the first satellite determines a relative distance between the first and second satellites by using the difference between a transmission time of the transmission signal and a reception time of the reception signal and the phase difference between the transmission and reception signals.

公开(公告)号：US20240162760A1

公开(公告)日：2024-05-16

申请号：US18507319

申请日：2023-11-13

Applicant: Hitachi, Ltd.

Inventor： Makoto ITO ,  Koichi WATANABE ,  Tsukasa FUNANE ,  Yosuke TANABE ,  Hisatoshi KIMURA ,  Keiji WATANABE

IPC: H02J50/30 ,  H02J7/35 ,  H02J50/40

CPC classification number: H02J50/30 ,  H02J7/35 ,  H02J50/40

Abstract: An electric-power conversion device receives an electromagnetic wave transmitted from space and converts the electromagnetic wave into electric power. The electric-power conversion device includes: an electric-power conversion portion for receiving an electromagnetic wave transmitted from space and converting the electromagnetic wave into electric power; a propelling device or driving device for moving the electric-power conversion device; a positioning device for determining the position of the electric-power conversion device; a control device for controlling the propelling device or the driving device based on information about the position and the electric power received by the electric-power conversion portion; and an electric-power supply device for supplying the electric power received by the electric-power conversion portion to an electric system.

公开(公告)号：US20230412124A1

公开(公告)日：2023-12-21

申请号：US18112752

申请日：2023-02-22

Applicant: Hitachi, Ltd.

Inventor： Tsukasa FUNANE ,  Koichi WATANABE ,  Yosuke TANABE ,  Jun HAYAKAWA

IPC: H02S40/44

CPC classification number: H02S40/44 ,  H10N10/00

Abstract: Provided is a power receiving system having an increased energy conversion efficiency. The power receiving system according to the present disclosure includes a power converter that receives electromagnetic waves transmitted from space and converts the electromagnetic waves into electric power; a thermal energy converter that is disposed adjacent to the power converter and converts thermal energy generated in the power converter; and a controller that controls operation of the thermal energy converter based on an energy intensity distribution of the electromagnetic waves.

公开(公告)号：US20170340252A1

公开(公告)日：2017-11-30

申请号：US15537686

申请日：2014-12-22

Applicant: HITACHI, LTD.

Inventor： Masahi KIGUCHI ,  Tsukasa FUNANE

IPC: A61B5/1455 ,  A61B5/00

CPC classification number: A61B5/14552 ,  A61B5/0075 ,  A61B5/14535 ,  A61B5/14553 ,  A61B5/4064 ,  A61B5/6814

Abstract: A device is provided for the optical measurement of a living body. For the purpose of separating a signal coming from the change in hemodynamics in a deep part from a signal coming from the change in hemodynamics in skin, light irradiation sites and light detection sites are positioned so that the measurement is achieved employing at least two SD distances. At two SD distances, the change in a logarithmic value of the detected light at every time point is determined employing a logarithmic value of the amount of detected light under specific conditions or at a specific time point as a starting point. A gradient value for a differential SD distance, which is a difference between the amount of change obtained by the measurement at a longer SD distance and the change obtained by measurement at a shorter SD distance, is used as a measurement amount.