Shimadzu Corporation

Japan Agency for Marine-earth Science and Technology

Nitto Seiko Co., Ltd.

Japan Agency for Marine-earth Science and Technolog

Naoki Nishimura

Takao Sawa

Koji Tojo

Keiko Sato

Kenta Chinomi

Ryosuke Nishi

Sinnichi Hamano

Kinya Kowada

Kazuhiro Ueba

This optical communication device () is provided with a plurality of light-receiving elements () and a plurality of optical fibers (). The plurality of optical fibers each includes a light-incident end portion () for communication light and a light-emission end portion () for communication light. The plurality of light-emission end portions is each arranged near each of the plurality of light-receiving elements. The plurality of light-incident end portions is each configured to be capable of being arranged in a predetermined position in a predetermined direction.

Optical communication device

An optical communication deviceis provided with: a plurality of light-receiving elementseach configured to receive light and output a light detection signal; a plurality of optical fibersprovided to correspond to the plurality of light-receiving elements, respectively, the plurality of optical fibers each being configured to guide the light to the corresponding light-receiving element; a plurality of amplifiersprovided to correspond to the plurality of light-receiving elements, respectively, the plurality of amplifiers each being configured to generate optical communication information by performing signal processing on the light detection signal; a light intensity information collection unitconfigured to collect intensity of the light received by each of the plurality of optical fibersas light intensity information; an optical fiber identification unitconfigured to identify the optical fiberthat is receiving relatively strong light out of the plurality of optical fibers, based on the light intensity information La to Le collected by the light intensity information collection unit; and a switch controllerconfigured to control to turn on the amplifier, the amplifierbeing provided to correspond to the optical fiberidentified by the optical fiber identification unit

The present invention relates to a fiber branch structure for spatial optical communication for transmitting information by emitting communication light. The fiber branch structure is provided with: a light emitter configured to emit communication light; a light emission controller configured to control the light emitter; an optical fiber configured to transmit the light emitted from the light emitter; a distributor configured to distribute the light, the distributer being optically coupled to an output terminal of the optical fiber; and an optical fiber group optically coupled to a plurality of output terminals of the distributor. According to the present invention, a communication area can be established without blind spots. That is, the fiber branch structure for spatial optical communication according to the present invention includes an optical fiber group optically coupled to a plurality of output terminals of the distributor. A communication area can be established more assuredly by such an optical fiber group, which prevents the optical communication from being interrupted.

Fiber branch structure for spatial optical communication and optical communication system equipped with same

This optical communication device () is provided with: a plurality of light-receiving elements () configured to receive communication light, the plurality of light-receiving elements being provided so as to correspond to a plurality of channels; and a controller () configured to perform control to invalidate output from a light-receiving element that has received high-intensity light higher in light intensity than a predetermined value among the plurality of light-receiving elements.

A first optical communication device is provided with a laser light sourcefor emitting communication light CL and a transmitting optical fiberarranged in water WA and having a light incident end portionon which the communication light CL is incident. The transmitting optical fibertransmits the communication light CL incident on the light incident end portiontoward the tip end portion. The transmitting optical fiberis provided with a core partconfigured to transmit the communication light CL from the light incident end portiontoward the tip end portionand a clad partcovering the core part, the clad part being configured to emit at least a part of the communication light CL that transmits the core partfrom a side surface of the transmitting optical fiber

Underwater optical communication device and underwater inspection system

The magnetic detection systemis provided with a magnetic sensor, a storage unit, a first determination unitfor outputting whether or not the magnetic bodyhas passed as a first determination result, a second determination unitfor outputting whether or not the magnetic body has passed as a second determination result, a display unitfor displaying (notifying) the first determination result and the second determination result. The second determination unit is configured to have higher determination accuracy than the first determination unit.

Magnetic detection system

This underwater optical wireless communication system () is provided with a plurality of moving bodies () capable of moving underwater. The plurality of moving bodies each includes a plurality of optical wireless communication units () each configured to perform bidirectional communication between the plurality of moving bodies using communication light beams () having wavelengths different from each other in a plurality of directions which are mutually opposite directions. The plurality of optical wireless communication units is configured to perform bidirectional communication between the plurality of moving bodies using communication light beams, the communication beams having the same wavelength with respect to each of the plurality of directions.

Underwater optical wireless communication system, underwater optical communication method, and underwater moving body

An underwater laser source is used in water and comprises a water pressure-resistant cylinder A having a light emission window, and the water pressure-resistant cylinder A comprises a plurality of semiconductor lasers-, and converging lensthat converges each laser light from the plurality of semiconductor lasers-, and emits converged each laser light to the light emission window

Underwater laser light source

Disclosed herein is a tapping screw () exerting an excellent anti-loosening effect with regard to a workpiece made of a soft material such as resin and an aluminum alloy. The tapping screw () includes a shaft part (), and a normal thread () which is formed on the outer circumferential surface of the shaft part. A clearance groove () is formed by cutting out a portion of a ridge of the normal thread, and an engaging protrusion () is provided on a bottom of the clearance groove along a portion or an entirety of an edge of the bottom that continuously extends from a flank surface of the normal thread. The tapping screw () exerts an excellent anti-loosening effect even when a workpiece expands, contracts or oscillates because the engaging protrusions () are embedded into portions of the workpiece which have been embedded into the clearance grooves ().

Growing community of inventors

Kyoto, Japan

Naoki Nishimura