Audio-technica Corporation

Nippon Chemical Industrial Co., Ltd.

Yosuke Takubo

Yutaro Kumagai

Shohei Araki

Ken Tamura

Jin Kuramoto

Takashi Nara

Hiroaki Kokubun

Yuki Nojiri

Hiromichi Ozawa

Kazuhiro Nakatsui

Aya Mashimo

Daichi Yamakawa

Earpiece for earphone

Provided is to achieve high call quality and improve wearability. A wireless earphoneincludes a driver unit (), a first microphone (), a second microphone (), and a housing () that accommodates the driver unit (), the first microphone (), and the second microphone (). The housing () includes a first accommodating portion () that accommodates the first microphone (), a second accommodating portion () that accommodates the second microphone (), and a main body () that is connected to each of the first accommodating portion () and the second accommodating portion (). The first accommodating portion () is projectingly provided from the main body (). The second accommodating portion () is projectingly provided from the main body () in a direction different from a projecting direction of the first accommodating portion ().

Wireless earphone

An earpiece whose inner cylinder is not crushed when the earpiece is inserted into an ear canal of a user is provided. An earpiece according to the present invention includes an inner cylinderthat includes one open end and the other open end and is attached to a sound conduit C of an earphone E, and an outer cylinderconnected to the one end of the inner cylinder and extending in an umbrella shape toward the other end of the inner cylinder so as to cover an outer surfaceof the inner cylinder. The inner cylinder includes a fitting partinto which a tip of the sound conduit is fitted, and a sound guide partconfigured to guide sound wave from the sound conduit to an ear canal. The sound guide part includes a constant diameter partthat has a constant inner diameter toward the one end side from the other end side and is disposed adjacent to the fitting part, and an expanded diameter partthat has an inner diameter continuously expanding toward one end side from the other end side and is disposed adjacent to the constant diameter part. The other end of the expanded diameter part is disposed closer to the other end side compared to a boundary B between an inner surfaceof the outer cylinder and the outer surface of the inner cylinder in an axial direction orthogonal to a radial direction of the inner cylinder. The length between an inner surfaceof the expanded diameter part and the outer surface of the inner cylinder in the radial direction of the expanded diameter part is the shortest at the boundary.

Earpiece and earphone

Battery charger for earphones

Earphone

The silyl phosphine compound of the present invention is represented by the formula (1) and has an arsenic content of not more than 1 ppm. The process for producing a silyl phosphine compound of the present invention is a process comprising mixing a basic compound, a silylating agent and phosphine to obtain a solution containing a silyl phosphine compound, removing a solvent from the solution to obtain a concentrated solution of a silyl phosphine compound, and distilling the concentrated solution, wherein an arsenic content in the phosphine is adjusted to not more than 1 ppm by volume in terms of arsine. The process for producing InP quantum dots of the present invention uses, as a phosphorus source, a silyl phosphine compound represented by the formula (1) and having an arsenic content of not more than 1 ppm by mass. 

Silyl phosphine compound, process for producing silyl phosphine compound and process for producing InP quantum dots

The silyl phosphine compound is represented by the following general formula (1). A content of a compound represented by the following general formula (2) is not more than 0.3 mol %. In the general formula (1), each R is independently an alkyl group having not less than 1 and not more than 5 carbon atoms or an aryl group having not less than 6 and not more than 10 carbon atoms. In the general formula (2), R is the same as in the general formula (1). 

Process for producing silyl phosphine compound and silyl phosphine compound

The process for producing a silyl phosphine compound of the present invention comprises a first step of mixing a solvent having a relative dielectric constant of not more than 4, a basic compound, a silylating agent and phosphine to obtain a solution containing a silyl phosphine compound, a second step of removing the solvent from the solution containing a silyl phosphine compound to obtain a concentrated solution of a silyl phosphine compound, and a third step of distilling the concentrated solution of a silyl phosphine compound to obtain the silyl phosphine compound. The silyl phosphine compound of the present invention is a silyl phosphine compound represented by the following general formula (1), wherein a content of a compound represented by the following general formula (2) is not more than 0.5 mol %. (For explanatory notes of the formulas, see the specification.)

Headphone

Growing community of inventors

Kanagawa, Japan

Yosuke Takubo