Abstract: A portable electric device such as a mobile phone is disclosed. The portable electric device comprises a first chassis and a second chassis, and the first chassis and the second chassis are foldably coupled. The first chassis comprises a case member that comprises a coupling recess, a first recess and a second recess. The coupling recess and the first recess face a same side of the case member. The second recess faces an opposite side of the case member to the coupling recess and the first recess. The second recess is located at a rear side of the coupling recess. The first recess and the second recess accommodate a first electronic component and a second electronic component, respectively.

Abstract: A portable electronic device includes a cover, and a casing engaged with the cover to form a space between the cover and the casing. The portable electronic device also includes a first mounting substrate in the space and an electroacoustic transducer between the first mounting substrate and the casing. The electroacoustic transducer converts from one of an audio and an electric signal into the other.

Abstract: A portable electric device such as a mobile phone is disclosed. The portable electric device comprises a first chassis and a second chassis, and the first chassis and the second chassis are foldably coupled. The first chassis comprises a case member that comprises a coupling recess, a first recess and a second recess. The coupling recess and the first recess face a same side of the case member. The second recess faces an opposite side of the case member to the coupling recess and the first recess. The second recess is located at a rear side of the coupling recess. The first recess and the second recess accommodate a first electronic component and a second electronic component, respectively.

Abstract: A portable electronic device includes a cover, and a casing engaged with the cover to form a space between the cover and the casing. The portable electronic device also includes a first mounting substrate in the space and an electroacoustic transducer between the first mounting substrate and the casing. The electroacoustic transducer converts from one of an audio and an electric signal into the other.

Abstract: A simplified butterfly valve with low noise in which a cavitation to be generated in a narrowed flow region that is delimited by a valve disc in a valve casing is reduced thereby to control the noise, and the valve can be applied even to a flow line for a fluid containing slurry or foreign particles, and can be used for a fluid flow line through a fluid is flows at a high flow rate. In the butterfly valve with low noise, an enlarged section 35 having the enlarged sectional shape symmetrical relative to the center axis is provided in a downstream side immediately behind a valve seat so as to control or suppress the noise and cavitation which occur around the valve disc, an inner diameter Dy of the enlarged section 35 is made more than 1.3 times a inner diameter D of the piping to which the valve is mounted, and the length X1 of the enlarged section 35 is made more than 0.5 times the inner diameter D of the piping.