Nippon Telegraph and Telephone Corporation

Shuichi Yanagi

Atsushi Aratake

Yusuke Yoshimura

Hisatoshi Kasahara

Suguru Oguchi

Yuta Ikeguchi

Masayoshi Ohno

Shin Sumida

Hirotsugu Sato

Yasuaki Tamura

Shinichi Iwano

Haruki Kozawaguchi

Yoshito Shuto

Shunichi Tohno

In an audio spot formation device D including a speaker unitand a support standthat supports the speaker unit, the speaker unitincludes a plurality of parametric speakersandthat divide a sound wave into a carrier wave and a sideband wave and radiate the carrier wave and the sideband wave, and a speaker disposition unitin which the plurality of speakersandare disposed, the speaker disposition unitis attached to the support standat a support unit P, at least one of a height of the support stand, an angle of attachment of the speaker disposition unitat the support unit P and a direction of at least one parametric speaker of the plurality of parametric speakersandis adjustable, and a position at which an audio spot is formed is adjusted via the adjustment.

Audio spot forming device

An audio spot forming system (S) is an audio spot forming system which transmits an alert sound to a vehicle traveling on a road, the audio spot forming system including a first parametric speaker () configured to emit a sideband wave, and a second parametric speaker () configured to emit a carrier wave, in which the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot.

Audio spot system and audio spot forming method

An optical connector plug has a front housing, a rear housing, a ferrule, a coil springand an optical cord fixing member, and in addition to the ferruleand the coil spring, the optical cord fixing memberfor fixing a tension resistive member and a cord outer jacket is received and held within an internal through space defined when the front housingand the rear housingare coupled. Also, upon assembling the optical connector plug, assembling of these memberstocan be realized by movement in an axial direction as much as possible. Accordingly, assembling of the optical connector plug is facilitated and suitable for automatic assembling.

Optical connector plug, manufacturing method thereof and assembling tool

A plastic ferrule for an optical connector comprises a cylindrical portion having one insertion hole for fixing an optical fiber and directly related to connection, a holding portion for allowing the cylindrical portion to be stably held in an optical connector, and an guiding portion for allowing an optical fiber to be guided into the ferrule. The ferrule has a hollow, cylindrical hole centering around the insertion hole inside the cylindrical portion. Thus, the ferrule has excellent dimensional accuracy of the outer diameter, and achieves connection of single mode fibers excellent in connection reliability and economy.

Plastic ferrule for optical connector and method for production thereof

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Tokyo, Japan

Shuichi Yanagi