Ultra-thin piezo speakers
28 October 2009
Analogue, Mixed Signal, LSI
The latest addition to Murata’s family of piezoelectric ceramic speakers is just 1,2 mm in thickness, with side ventilation in its sturdy metal housing. The VSLBP1913E series’ rectangular shape improves its frequency response and minimises ‘dead-space’ in handheld devices. The series’ flat frequency response makes it suitable for the replay of voice and music.
Frequency response of the new rectangular speakers is said to be much improved over circular diaphragms as the rectangular ones are multimodal ie, multiple oscillation modes can be generated along the long and short sides of the diaphragm, to create as many ‘peaks’ on the frequency axis as possible. Another improved feature of the VSLBP1913E series is the soft and flexible resin film the diaphragm is mounted on. This film reduces the primary resonant frequency and damps resonant characteristics of the piezoceramic, contributing to flattening the frequency characteristic. The diaphragm’s multilayered piezoceramic construction creates powerful sound, up to a sound pressure level of 90 dB (measured at 1 kHz, 5,0 Vrms, sinewave, at 0,1 m, 0 dB:20 μPa).
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