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http://dx.doi.org/10.5050/KSNVN.2006.16.2.183

Development of Combined Permanent Magnet Type Microspeakers Used for Mobile Phones  

Hwang, Sang-Moon (부산대학교 기계설계공학과)
Lee, Hong-Joo (부산대학교 기계설계공학과)
Kwon, Joong-Hak (부산대학교 기계설계공학과)
Hwang, Gun-Yong (영산대학교 네트워크공학부)
Yang, Yong-Chang (부산대학교 기계설계공학과)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.16, no.2, 2006 , pp. 183-189 More about this Journal
Abstract
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.
Keywords
Broadband; Finite-Element Method; Magnetic Circuit; Microspeaker;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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