• Title, Summary, Keyword: Thick film speaker

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Evaluation of Piezoelectric Properties in Pb(Zr1Ti)O3-PVDF Composites for Thick Film Speaker Application (후막 스피커 응용을 위한 Pb(Zr1Ti)O3-PVDF 복합체의 압전 특성 평가)

  • Son Yong-Ho;Kim Sung-Jin;Kim Young-Min;Jeong Joon-Seok;Ryu Sung-Lim;Kweon Soon-Yong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.10
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    • pp.966-970
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    • 2006
  • We reported on characteristics of the piezoelectric ceramic-polymer composite for the application of the thick-film speaker. The PVDF-PZT composites were fabricated to incorporate the advantages of both ceramic and polymer with various mixing ratios by 3-roll mill mixer. The composite solutions were coated by the conventional screen-printing method on ITO electrode coated PET (Polyethylene terephthalate) polymer film. After depositing the top-electrode of silver-paste, 4 kV/mm of DC field was applied at $120^{\circ}C$ for 30 min to poling the composite films. The value of $d_{33}$ (piezoelectric charge constant) was increased when the PZT weight percent was increased. The maximum value of the $d_{33}$ was 24 pC/N at 70 wt% PZT. But the $g{33}$ (piezoelectric voltage constant) showed the maximum value of $32mV{\cdot}m/N$ at 65 wt% of PZT powder. The SPL (sound pressure level) of the speaker fabricated with the 65:35 composite film was about 68 dB at 1 kHz.

Evaluation of Piezoelectric Properties in Pb(Zr,Ti)$O_3$-PVDF 0-3Type Composites for Thick Film Speaker Application (후막스피커 응용을 위한 Pb(Zr,Ti)$O_3$-PVDF 0-3형 복합체의 압전 특성 평가)

  • Son, Yong-Ho;Kim, Sung-Jin;Jeong, Joon-Seok;Ryu, Sung-Lim;Kweon, Soon-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.40-41
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    • 2006
  • In this work, we developed the 0-3 type piezoelectric composite to incorporate the advantages of both ceramic and polymer. The PVDF-PZT composites were fabricated with various mixing ratio by 3-roll mi11 mixer. The composite solutions were coated on ITO bottom-electrode deposited on PET (polyethylene terephthalate) polymer film by the conventional screen-printing method. After depositing the top-electrode of silver-paste, 4kV/mm of DC field was applied at $120^{\circ}C$ for 30min to poling the 0-3 composite film. The value of $d_{33}$ was increased as the PZT weight percent was increases. But the $g_{33}$ value showed the maximum at 65 wt% of PZT powder.

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Characteristics and Fabrication of Multi-Layered Piezoelectric Ceramic Actuators for Speaker Application (스피커 응용을 위한 적층형 압전 세라믹 액츄에이터 제조 및 특성)

  • Lee, Min-seon;Yun, Ji-sun;Park, Woon Ik;Hong, Youn-Woo;Paik, Jong Hoo;Cho, Jeong Ho;Park, Yong-Ho;Jeong, Young-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.10
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    • pp.601-607
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    • 2016
  • Piezoelectric thick films of soft $Pb(Zr,Ti)O_3$ (PZT) based commercial material (S55) were fabricated using a conventional tape casting method. Ag-Pd electrodes were printed on the piezoelectric film at room temperature and all 5 layered films with a dimension of $12mm{\times}16mm$ were successfully laminated for a multi-layered piezoelectric ceramic actuator. The laminated specimens were co-fired at $1,100^{\circ}C$ for 1 h. A flat layered and dense microstructure was obtained for the $112{\mu}m$ thick piezoelectric actuator after sintering process. Thereafter, a prototype piezoelectric speaker was fabricated using the multi-layered piezoelectric ceramic actuator which can operate as a bimorph. Its SPL (sound pressure level) characteristic was also evaluated for speaker application. Frequency response revealed that the output SPL with a root mean square voltage of 10 V increased gradually to the highest peak of 87.5 dB for 1.5 kHz and exhibited a relatively stable behavior over the measured frequency range (${\leq}20kHz$) at a distance of 10 cm, implying that the fabricated piezoelectric speaker is potential for speaker applications.