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이동통신 단말기용 통합 영구 자석 형태의 마이크로스피커 개발
황상문(Hwang, Sang-Moon),이홍주(Lee, Hong-Joo),권중학(Kwon, Joong-Hak),황건용(Hwang, Gun-Yong),양용창(Yang, Yong-Chang) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.2
In mobile phones of multimedia era, microspeakers of high qualify sound are essential parts to generate human voice in speaker phone and MP3 song player. In this paper, two types of microspeakers, outer permanent magnet (PM) and combined PM type, are analyzed using electromagnetic, mechanical and their coupling analysis. For performance comparison, voice coil diameter is chosen as a design parameter to change excitation position and magnet volume for both types. For combined PM type, sound pressure level (SPL) is improved due to increased PM volume compared to outer PM type. Also, with the decreased voice coil diameter for combined PM type, the 1st resonant mode of the diaphragm is more efficiently excited due to concentrative excitation, resulting in lower and broader frequency range. Therefore, it can be said that the combined PM type microspeakers are more advantageous for high performance microspeaker which are essential for multimedia era.