Electroacoustic transducer and electronic equipment using the sa

Details Electroacoustic transducer and electronic equipment using the sa Electroacoustic transducer and electronic equipment using the sa

1997-10-06

2000-01-04

Le, Huyen

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

381400, 29594, H04R 2500

Patent

active

060118563

ABSTRACT:
The present invention provides an electroacoustic transducer which realizes an optimum characteristic thereof utilizing heat caused by reflow soldering without being influenced by the same heat. The electroacoustic transducer includes a magnetic driving portion composed of a base, a core provided upright on the base and a coil wound around the core, wherein a height of the coil at the manufacturing time is set lower by a height which corresponds to thermal expansion of the coil in reflow soldering, and a projection length of the core exposed from the coil at the manufacturing time is set larger by the height which corresponds to thermal expansion of the coil in reflow soldering.

REFERENCES:
patent: 4048713 (1977-09-01), Hvass
patent: 4504703 (1985-03-01), Schneiter et al.
patent: 5091028 (1992-02-01), Yamazaki et al.
patent: 5432758 (1995-07-01), Sone

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