公开(公告)号：US20240200950A1

公开(公告)日：2024-06-20

申请号：US18287979

申请日：2021-05-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazutaka HARA ,  Ryo IGARASHI ,  Junichi KANI ,  Naotaka SHIBATA ,  Takeshi IMAI

IPC: G01C21/20 ,  H04B10/116

CPC classification number: G01C21/206 ,  H04B10/116

Abstract: An aspect of the present invention is a moving body that moves along a rail, the moving body including: a light emission unit; a movement control unit that controls the moving body so as to move on the rail at a predetermined speed; a measurement unit that measures a movement time of moving from a predetermined position on the rail; and a transmission unit that transmits a signal indicating position information corresponding to the movement time measured by the measurement unit by using the light emission unit.

公开(公告)号：US20240187094A1

公开(公告)日：2024-06-06

申请号：US18285496

申请日：2021-04-05

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Takeshi IMAI ,  Rintaro HARADA ,  Shin KANEKO

IPC: H04B10/112 ,  H04B10/516 ,  H04L1/00

CPC classification number: H04B10/112 ,  H04B10/5161 ,  H04L1/0061

Abstract: A beam transmission device transmits a directional beam toward a beam reception device in a wireless communication system. The main signal generation unit generates a main signal. A control signal generation unit periodically generates a control signal related to maintaining communication with the beam reception device. A signal multiplexing unit multiplexes the main signal and the control signal. A divergence angle adjustment unit sets a target divergence angle to a first divergence angle in a period in which the control signal is not included in the multiplexed signal, and sets the target divergence angle to a second divergence angle larger than the first divergence angle in a period in which the control signal is included in the multiplexed signal. A beam control unit changes a divergence angle of the beam modulated by the multiplexed signal to the target divergence angle.

公开(公告)号：US20240421904A1

公开(公告)日：2024-12-19

申请号：US18704126

申请日：2021-10-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Shin KANEKO

IPC: H04B10/112 ,  H04B10/50

Abstract: An aspect of the present invention is a mobile including an optical transmitter that transmits an optical signal by irradiating a light receiver of a reception device with a beam, an instruction receiver that receives a movement instruction to move the mobile to a designated position, a position acquirer that acquires a current position of the mobile, a direction acquirer that acquires a moving direction from the current position to the designated position, and a beam controller that performs change control of changing an irradiation direction of a beam according to the moving direction within a range in which the beam is emitted to the light receiver before the mobile starts to move toward the designated position.

公开(公告)号：US20220368417A1

公开(公告)日：2022-11-17

申请号：US17623967

申请日：2019-07-01

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takeshi IMAI ,  Kota ASAKA ,  Takuya KANAI

IPC: H04B10/114

Abstract: A station-side telescope included in a station-side optical antenna unit is configured to transmit and receive an optical signal, a guide light source is configured to emit guide light in a direction of orientation of the station-side telescope, a node-side telescope is configured to transmit and receive an optical signal, a node-side control unit included in a node-side optical antenna unit is configured to generate and output a control signal for moving a node-side base based on a position of the guide light included in an image obtained by a camera capturing the guide light emitted by the guide light source so that a direction of orientation of the node-side telescope faces the direction of orientation of the station-side telescope, an antenna drive unit is configured to receive the control signal and generate and output a drive signal based on the control signal, and the node-side base included in the node-side optical antenna unit is configured to support the node-side telescope and receive the drive signal to change a direction of orientation of the node-side telescope.

公开(公告)号：US20230421257A1

公开(公告)日：2023-12-28

申请号：US18039425

申请日：2020-12-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Junichi KANI ,  Shin KANEKO ,  Naotaka SHIBATA ,  Rintaro HARADA

IPC: H04B10/112 ,  H04B10/50 ,  H04B10/60

CPC classification number: H04B10/112 ,  H04B10/503 ,  H04B10/60

Abstract: An optical transmitter (3) tracks a moving body (1) and irradiates the moving body (1) with a laser beam (4). An optical receiver (5) is mounted on the moving body (1), receives the laser beam (4), and performs optical space communication with the optical transmitter (3). The optical transmitter (3) extends an irradiation range (6) of the laser beam (4) into an elliptical shape.

公开(公告)号：US20230208518A1

公开(公告)日：2023-06-29

申请号：US17926705

申请日：2020-05-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Yushi KOYASAKO ,  Keita NISHIMOTO ,  Takashi YAMADA

IPC: H04B10/112

CPC classification number: H04B10/1127

Abstract: An optical wireless communication system (1) for wirelessly transmitting a signal beam (L) between optical communication units (2) and (3) located at two points apart from each other includes an aiming mechanism (4) that is provided in each of the optical communication units (2) and (3) located at the two points and has an aiming line (S), which is parallel to an optical axis (O) and has a predetermined interval from the optical axis (O), with the optical axis (O) of the signal beam (L) of each of the optical communication units (2) and (3) located at the two points aligned in a straight line, and a first front sight that is provided in each of the optical communication units (2) and (3) and provided at a position that is off the optical axis (O) and the aiming line (S) and has a predetermined interval from the optical axis (O) and a predetermined interval from the aiming line (S).

公开(公告)号：US20240372614A1

公开(公告)日：2024-11-07

申请号：US18284535

申请日：2021-04-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Shin KANEKO ,  Rintaro HARADA

IPC: H04B10/11 ,  H01S5/00 ,  H01S5/02251

Abstract: According to an embodiment, an optical space communication device includes: an optical antenna configured to receive laser light emitted by multiplexing a main signal to be communicated and a control signal used to maintain or control communication; an optical branching element configured to branch the laser light received by the optical antenna into a plurality of pieces of laser light; a first optical fiber configured to transmit one of the pieces of laser light branched by the optical branching element to a light reception element; a second optical fiber configured to have a larger core diameter than a core diameter of the first optical fiber and transmit another piece of laser light branched by the optical branching element to the light reception element; and an extraction unit configured to extract the control signal from the other piece of laser light transmitted by the second optical fiber.

公开(公告)号：US20240201316A1

公开(公告)日：2024-06-20

申请号：US18288011

申请日：2021-05-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Kazutaka HARA ,  Ryo IGARASHI

IPC: G01S5/16

CPC classification number: G01S5/16

Abstract: A mobile terminal according to the present invention is configured to: acquire position information from a lighting device which transmits the position information by a change in a light output mode; derive a first distance between a first coordinate and a terminal projection position, the first coordinate indicating a position obtained by projecting, on a projection plane parallel to a floor surface, a first lighting device from which first position information is acquired as the position information, and the terminal projection position being obtained by projecting the mobile terminal on the projection plane; derive a second distance between a second coordinate and the terminal projection position, the second coordinate indicating a position obtained by projecting, on the projection plane, a second lighting device from which second position information is acquired as the position information; acquire a rotation angle of rotation of the mobile terminal on the projection plane from acquisition of the first position information to acquisition of the second position information; and estimate a coordinate indicating the terminal projection position based on the first coordinate, the first distance, the second coordinate, the second distance, and the rotation angle.

公开(公告)号：US20240162982A1

公开(公告)日：2024-05-16

申请号：US18284297

申请日：2021-04-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Shin KANEKO ,  Rintaro HARADA

IPC: H04B10/112

CPC classification number: H04B10/112

Abstract: According to an embodiment, an optical space communication device includes: an optical antenna configured to receive laser light emitted by multiplexing a main signal to be communicated and a control signal used to maintain or control the communication; an optical branching element configured to branch the laser light received by the optical antenna into first laser light and second laser light; a main signal extraction unit configured to extract the main signal based on the first laser light; a positional deviation detection unit configured to detect a positional deviation of the laser light based on the second laser light; and a control signal extraction unit configured to extract the control signal based on the second laser light.

公开(公告)号：US20220113478A1

公开(公告)日：2022-04-14

申请号：US17427866

申请日：2020-01-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Takeshi IMAI ,  Yumiko SENOO ,  Kota ASAKA

IPC: G02B6/42 ,  H01L31/0232

Abstract: A wavelength-selective optical reception device includes a photoreceptor (21) that converts optical signals (201) into electric signals and outputs the electric signals, a base (31) on which the photoreceptor (21) is provided, a housing (41) that is mounted on the base (31) and surrounds the photoreceptor (21) along with the base (31), and that is provided with a window (51) to pass optical signals (203) including the optical signals (201) and including optical signals (202) of a wavelength different from a first wavelength of the optical signals (201) and a window (52) to pass the optical signals (202), and an optical filter (61) that is disposed inside the housing between the window (51) and the photoreceptor (21) along the optical axis (205) of the optical signals (203), and that outputs, out of the optical signals (203) that enter thereto, the optical signals (201) toward the photoreceptor (21), and reflects the optical signals (202) toward a near side in a direction of travel of the optical signals (203).