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. 2019 Feb 1;19(3):609. doi: 10.3390/s19030609

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Design of the press-fit system for creating the front face of the multi-focal point (MFP) transducer. (b) Photograph of the press-fit system. (c) Components of the press-fit system: Base plate/rod/screw (BP/R/S), Teflon/PVDF film/copper-clad polyimide (T/PVDF/CCP), pressure plate/screw (PP/S), spring (SP), multi-spherical pattern (MSP), slide plate/rod (SP/R), sensor of force (S), top plate/screw (TP/S), force screw (FS). (d) Design of multi-spherical pattern for creating transducer using five focal points. (e) Photograph of multi-spherical pattern.