Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Patent
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
Imahori Yoshio
Kigawa Naoyuki
Sone Takahiro
Le Huyen
Star Micronics Co. Ltd.
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