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A single piezoelectric element with structured electrodes enables efficient ultrasonic transducer operation in multiple modes, addressing the inefficiencies of dual-material designs by optimizing transmission and reception without additional complexity or cost.

DE102024211388A1Pending Publication Date: 2026-05-28ROBERT BOSCH GMBH
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Patent Information

Application Number
DE102024211388
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing ultrasonic transducers face challenges in optimizing efficiency for both transmitting and receiving acoustic signals due to the use of two different piezoelectric materials, which increase complexity, cost, and risk of thermal expansion issues, while also restricting transmitter and receiver areas, and exhibiting different hysteresis behaviors.

Method used

A single piezoelectric element is used with structured electrodes to operate in different modes, such as transverse and shear modes, allowing for optimized transmission and reception without the need for sequential deposition and structuring of multiple materials.

Benefits of technology

This design simplifies manufacturing, reduces costs, and enhances efficiency by allowing the transducer to operate optimally in both transmission and reception modes, overcoming the limitations of dual-material designs.

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Abstract

The present invention relates to a piezoelectric transducer (10) for transmitting and receiving acoustic signals. A substrate (4) serves as a support for a membrane (3). A first piezoelectric element (1) for transmitting acoustic signals is arranged on the membrane (3). The first piezoelectric element (1) has at least a first lower electrode (BE1), a second lower electrode (BE2), a first upper electrode (TE1), a second upper electrode (TE2), and a piezoelectric layer (P) made of a piezoelectric material arranged between the electrodes (BE, TE, or structured electrodes). The structured electrodes on each layer can be used to operate the piezoelectric material in each of the modes – d31 (transverse), d33 (thickness), and d15 (shear) – and to distribute the electric field over the material to increase the effective electrode spacing.
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Citation Information

Patent Citations

  • Micromachined ultrasound transducer using multiple piezoelectric materials

    US10566949B2

  • Piezoelectric microphone diaphragm, has piezoelectric layers arranged one above the other, and metal layer lying between piezoelectric layers, where c-axes of piezoelectric layers are positioned in same direction

    DE102005008514A1