Chong Kun Dang Corporation

Dowumitec Corporation

Sang Chul Lee

Jung Woo Kim

Kyeong Bok Min

Nam Hee Choi

Don Wha Lee

Gang Sun Choi

Bon Youn Koo

Yun Beom Ham

Disclosed is a bone-conduction transducer comprising a plate-shaped yoke bent to form a pair of cut portions at both ends thereof; voice coils fitted to a center extension of the cut portions; a magnet and a plate of rectangular parallelepiped shape disposed between the voice coils; and a diaphragm minutely spaced from a lower part of the plate. The present invention constructed as above has an advantage of optimizing the bone-conduction transducer by fitting the voice coils to both the center extensions of the yoke to convert electrical signals into magnetic attractive and repulsive forces, and arranging the magnet and the plate between the voice coils. Further, the present invention has yet another advantage of enhancing the output efficiency, minimizing noise, and drastically reducing distortion, by improving functions of a base supporting the diaphragm as well as the diaphragms (made of a very low magnetic resistance material), whose weight is drastically reduced as compared to conventional diaphragms, in a manner of vibrating the diaphragm by virtue of the voice coils and the magnetic attractive and repulsive forces created according to variations in the current applied to the voice coils.

Bone-conduction transducer and bone-conduction speaker headset therewith

Process for preparing cyclosporin A

Growing community of inventors

Kyeonggi-do, South Korea

Sang Chul Lee