Toyoda Gosei Co., Ltd.

Kenji Haga

Yukitoshi Inui

Akari Nakao

Masaaki Tsuchimori

Kazuhiro Terada

Akiko Okita

Takao Sato

The present invention provides a light coupler and a manufacturing method thereof. The light coupler of the invention includes a plurality of light input terminals, a plurality of light output terminals, a plurality of half mirrors, and an optical wave guide connecting the plurality of the light input terminals, the plurality of the light output terminals and the plurality of the half mirrors. The optical wave guide has kinked line shape and each of the plurality of half mirrors is placed at a respective corner of the kinked line shape. Especially, the kinked line shape includes a polygon network.

Light coupler and manufacturing method thereof

The optical branching-coupling device having a self-written optical waveguide core is formed without using half mirrors. In the optical branching-coupling device, three POFs are inserted into a housing having an approximately D-shaped sidewall. An approximately semi-columnar region V in the housing was filled with an uncured liquid light-curing acrylic resin. A laser beam was introduced from one of the POFs, and a cured material was formed of the end face of the POF. The diameter was equal to the core diameter of the POF. The cured material grew, resulting in the cured material reaching the end face of another one of the POFs, thereby forming an optical waveguide core. Next, a laser beam was introduced from the end face of the last one of the POFs. The cured material grew, resulting in a connection with the optical waveguide core, thereby forming the optical waveguide core.

Optical branching-coupling device, and manufacturing method and optical module of the same

A leakage measuring apparatus for detecting a minute amount of leakage of a sealing valve in a short time with high sensitivity, provided with a first pressure supply device for applying the same pressure to a first fluidic circuit and a test connection port to be connected with a sealing valve under leakage measurement, and to a second fluidic circuit serving as the reference and a reference connection port. First and second electromagnetic valves cut off the communication of the fluidic circuits to the first pressure supply device while the first and second fluidic circuits are under the applied pressure. A pressure sensor detects the pressure of the first fluidic circuit. A second pressure supply device supplies fluid to the first fluidic circuit and the same amount of fluid to the second fluidic circuit in order to maintain the pressure in the first fluidic circuit at the applied pressure on the basis of the detected pressure of the pressure sensor. A differential pressure sensor senses a differential pressure between the fluid pressures of the two fluidic circuits, thereby measuring the amount of leakage from the sealing valve quickly and accurately on the basis of the detected differential pressure.

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Aichi-ken, Japan

Kenji Haga