To provide a waterproof electroacoustic transducer having a high waterproof performance and a portable electronic device provided with the same. The waterproof electroacoustic transducer of the portable electronic device includes: an ele...
The flextensional electroacoustic transducer is resurging as a candidate for high‐power, low‐frequency active sonar. It has experienced steady investigat...
An arrangement is provided for converting an electric signal into an acoustic or a mechanic signal comprising a transducer (11), a linear or nonlinear filt...
An arrangement is provided for converting an electric signal into an acoustic or a mechanic signal comprising a transducer (11), a linear or nonlinear filt...
An acoustic medical treatment apparatus is disclosed, which is designed to perform medial treatment with high efficiency and enhanced safety by using electroacoustic transducer elements (10). The apparatus includes a concave transducer f...
PURPOSE:To suppress unnecessary peak acoustic pressure at a high band by setting the fixed part at peripheral part of a piezo-electric vibrator to the non- circular shape, and suppressing efficiently the higher resonance. CONSTITUTION:Ba...
It is proposed to use a sonic energy generator to increase the recovery efficiency of a reservoir. This process is particularly useful in low producing or depleted reservoirs which still contain large amounts of petroleum. The generator ...
It is proposed to use a sonic energy generator to increase the recovery efficiency of a reservoir. This process is particularly useful in low producing or depleted reservoirs which still contain large amounts of petroleum. The generator ...
Stable aqueous dispersions comprise a nonionic emulsifier, a water-insoluble copolymer containing in the molecule an ester of acrylic or methacrylic acid and 0.25 to 25 mol. per cent of carboxyl-containing units derived from acrylic, met...
Stable aqueous dispersions comprise a nonionic emulsifier, a water-insoluble copolymer containing in the molecule an ester of acrylic or methacrylic acid and 0.25 to 25 mol. per cent of carboxyl-containing units derived from acrylic, met...
Stable aqueous dispersions comprise a nonionic emulsifier, a water-insoluble copolymer containing in the molecule an ester of acrylic or methacrylic acid and 0.25 to 25 mol. per cent of carboxyl-containing units derived from acrylic, met...
The present invention relates to an acoustical material and also to a method of its preparation. It is an object of the present invention to provide a poro...
The present invention relates to an acoustical material and also to a method of its preparation. It is an object of the present invention to provide a poro...
The present invention relates to an acoustical material and also to a method of its preparation. It is an object of the present invention to provide a poro...
The present invention relates to an acoustical material and also to a method of its preparation. It is an object of the present invention to provide a poro...
The present invention relates to an acoustical material and also to a method of its preparation. It is an object of the present invention to provide a poro...
This invention relates to magnetic diaphragms for electrical reproduction of sound and, more particularly, to telephone diaphragms, and the like, made from a plastic composition having a : comminuted magnetic metal incorporated therein. ...
This invention relates to telephone receivers and particularly to that type of receiver known as a "bone conduction" receiver wherein vibrations produced thereby are transmitted to the auditory nerve through direct contact between the vi...
A loudspeaker having a diaphragm including first and second layers and a core sandwiched between the layers, the core being firmly secured to the inner surface of each layer so as to form a unitary structure therewith, a drive assembly c...
An electromagnetic transducer in which a D.C. magnetic flux generating section including a permanent magnet and a signal flux generating section including a coil are arranged in spaced relation on opposite sides of a diaphragm to form a ...
