The Furukawa Electric Co., Ltd.

Honda Motor Co., Ltd.

Komatsu Corporation

Koji Kajiwara

Yoshihiro Emori

Akira Fujisaki

Takeshi Takagi

Kousuke Kashiwagi

Taizo Miyato

Kazuaki Hyuga

Koichiro Nakamura

Keishi Takaki

Kanji Tanaka

Tomoaki Taki

Yosuke Shionoya

Genta Inoue

Seiichi Hayashi

Kosuke Kashiwagi

A communication apparatus is provided in a movable object, and communicates with an external server. The communication apparatus includes a communication control unit for controlling communication with the server, and controlling communication with a movable object control unit controlling the movable object and communication with an update control unit controlling program update of the movable object control unit. The communication control unit performs, when control on the movable object control unit is to be performed from the server, control to receive a first startup request and a command for the movable object control unit from the server, start up and control the movable object control unit, and performs, when control related to program update of the movable object control unit is to be performed from the server, control to receive a second startup request for the update control unit from the server, and start up the update control unit.

Communication apparatus, movable object, control system, server, communication control method

An optical module comprising a first optical fiber corresponding to an incidence side for laser light a second optical fiber corresponding to an emission side for the laser light; and a connection protecting portion that is provided and located so as to cover a connection site for optically connecting the first optical fiber and the second optical fiber, wherein the second optical fiber has a larger core diameter than the first optical fiber, the connection site is a site where a core portion of the first optical fiber and a core portion of the second optical fiber are connected to each other in a discontinuous shape, and the connection protecting portion is formed of a thermally conductive protective material and/or a photorefractive protective material includes refractive index that is equal to or higher than that of a clad portion of the first optical fiber.

Optical module and light output device

An optical fiber laser device generates laser light by using an optical amplifying fiber as an amplification medium in a laser oscillator and includes: an optical outputting fiber configured to emit laser light to an outside; a return-light-attenuating portion configured to perform an attenuation process to return light propagating through at least the optical outputting fiber in a reverse direction of the laser light; a thermal conversion unit provided at the return-light-attenuating portion and configured to convert the return light into heat; a temperature-monitoring device configured to measure an increase in a temperature, of the return-light-attenuating portion, caused by the heat converted by the thermal conversion unit; and a control unit configured to decrease or stop an output of the laser light when the temperature measured by the temperature-monitoring device becomes a predetermined threshold temperature or higher.

Optical fiber laser device

A laser device includes an optical fiber laser unit including an amplification optical fiber, a plurality of pumping light sources outputting pumping lights for optically pumping the amplification optical fiber, and a controller controlling the pumping light sources. When an instruction value for supplying a predetermined driving electric current to each of the pumping light sources is input to the controller, the controller conducts a control of supplying a compensated electric current value as a driving electric current obtained by multiplying an initial electric current value corresponding to the instruction value by a compensation coefficient and supplying the compensated electric current value to each of the pumping light sources. The compensation coefficient is set to restrain a decrease in a power with time of a laser light output from the optical fiber laser unit.

Laser device

An optical fiber laser device includes optical reflectors making an invisible laser light from an amplification optical fiber; a light source outputting a visible light; an introduction unit outputting the laser light input to a first input terminal from a first output terminal mainly, outputting the visible light input to a second input terminal from the first output terminal mainly, inputting the visible light output by the light source connected to the second input terminal and introducing the visible light to the amplification optical fiber or a output optical fiber via the first output terminal; an optical multiplexer/demultiplexer outputting the visible light to the introduction unit, and outputting a leaking return light input from a side of the introduction unit; and a controller outputting the visible light from the output optical fiber in a case of determining a position at which the laser light will be irradiated.

Optical fiber laser equipment

Growing community of inventors

Tokyo, Japan

Koji Kajiwara