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Waterproof piezoelectric speaker cuts dead space

Posted: 26 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:piezoelectric? speaker? mobile phone?

Murata Manufacturing Co. Ltd launches a mobile phone speaker based on the company's proprietary piezoelectric technology that is waterproof to IPX5/IPX7. The speaker measures 19.5mm x 14.1mm x 0.9mm, a rectangular shape that reduces dead-space from designs while its ultra-thin dimensions contribute to greater freedom in equipment design.

Of the 50 new Japanese mobile phone models announced for 2010, almost one in four will be waterproof mobile phones, one of numerous indicators of a growing trend towards the waterproofing of mobile equipment. Given there are so many different areas that require waterproofing, there were many technical challenges and cost issues to overcome when developing the waterproof speaker.

 VSLBG1914E1400-T0 waterproof dynamic speaker

Conventional methods of waterproofing dynamic speakers used waterproof sheets which covered the output sound holes, reducing sound quality. Murata's approach incorporates a rubber film into the speaker itself, leaving the output sound holes open.

The width of the metal frame housing the speaker has been increased to improve the seal between the metal frame and the chassis, preventing water penetration. The new waterproof speaker, part number VSLBG1914E1400-T0 supports an average sound pressure level of 92 3dB (based on 1,500Hz 2,000Hz / 2,500Hz / 30,00Hz average) with a resonant frequency of 1,400Hz 20 percent.

Since no magnets are used, there is no possibility of malfunctions caused by iron sand, or EMI effects on magnetic sensors.

- Julien Happich
EE Times

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