Takeda Pharmaceutical Company Limited

Onkyo Corporation

Takashi Ouchi

Giho Goh

Sunmi Kim

Jinsoon Choi

Hunsoo Park

Masanori Ito

Akira Tamadera

Naoki Imagawa

Shun Muramoto

The present invention provides a production method of a 3-cyanopyrrole compound possibly useful as an intermediate for pharmaceutical products. A production method of compound (II) including subjecting compound (I) to a reduction reaction, in which the aforementioned reduction reaction is continuous hydrogenation reaction in a fixed bed reactor filled with a supported metal catalyst. A production method of compound (III) including subjecting compound (I) to a reduction reaction followed by a cyclization reaction, in which the aforementioned reduction reaction is continuous hydrogenation reaction in a fixed bed reactor filled with a supported metal catalyst.

Method for producing pyrrole compound

The present invention provides a production method of a 3-cyanopyrrole compound possibly useful as an intermediate for pharmaceutical products. A production method of compound (II) including subjecting compound (I) to a reduction reaction, in which the aforementioned reduction reaction is continuous hydrogenation reaction in a fixed bed reactor filled with a supported metal catalyst. A production method of compound (III) including subjecting compound (I) to a reduction reaction followed by a cyclization reaction, in which the aforementioned reduction reaction is continuous hydrogenation reaction in a fixed bed reactor filled with a supported metal catalyst. 

The present invention relates to a canal type earphone configured such that an outlet for a sound wave to be reproduced is inserted into an inlet of a user's ear canal. The earphone includes an electrodynamic speaker unit configured to electroacoustically convert an audio signal into a high-frequency sound wave containing a band component having a higher frequency than that of an audible band of a human being, thereby emitting the high-frequency sound wave; an electromagnetic speaker unit configured to electroacoustically convert the audio signal into a low-frequency sound wave containing more band components having a lower frequency than that of the high-frequency sound wave, thereby emitting the low-frequency sound wave; and a housing to the inside of which the electrodynamic speaker unit and the electromagnetic speaker unit are attached.

Earphone

There are provided headphones and a speaker unit having proper acoustic properties and exhibiting excellent reproduced sound quality even in the case of providing air holes at a damping member. The headphones include a speaker unit having a diaphragm and a frame supporting an outer peripheral portion of the diaphragm, a housing configured to house the speaker unit, and a damping member made of a material exhibiting air permeability and attached to cover an opening of the frame through which a sound wave emitted from the diaphragm passes and/or an opening of the housing. The damping member has one or more air holes formed by removal of the material forming the damping member. A secondary damping member is attached to an annular edge portion defining each air hole, thereby reducing vibration of the edge portion.

Headphones and speaker unit

The present invention relates to a headphone including a housing defining a back chamber on a back side of a speaker unit. A headphone includes a speaker unit and a housing defining an internal space provided on an acoustic emission side as a back side of the housed speaker unit and an air chamber provided separately from the internal space. The housing includes a first housing member provided with a first hole allowing communication between an exterior and the air chamber, a second housing member attached to the speaker unit and coupled to the first housing member to define the internal space and the air chamber, and a third housing member fixed with the third housing member being sandwiched between the first and second housing members and provided with a second hole allowing communication between the air chamber and the internal space.

Growing community of inventors

Osaka, Japan

Takashi Ouchi