Monolithic Bending Element Using Pure Silver Electrodes
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Solution Overview
Problem
Existing electrodynamic vibration exciters are bulky and heavy, making them difficult to miniaturize for small devices, while multi-layer bending elements based on piezoceramic materials are costly and complex to manufacture, limiting their use in mass markets due to the need for precious metals and optimized geometries for specific structures.
Innovation Solution
A method using pure silver as the internal electrode and co-doped PZT ceramic materials that sinter at lower temperatures, allowing for the production of multilayer bending elements with reduced material costs and increased flexibility in geometry, enabling efficient sound transduction without sacrificing sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-layer bending elements use precious metals (silver-palladium alloy) for inner electrodes to prevent oxidation at high sintering temperatures, then reliability is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the sintering temperature parameter from conventional high temperatures (1100-1200°C) to a lower range (800-950°C). This parameter change allows the use of pure silver electrodes without oxidation, eliminating the need for expensive palladium alloys while maintaining electrode reliability through the controlled thermal process
Solution Approach 2:
The patent replaces expensive precious metal alloys with pure silver, a more economical material. By controlling the sintering process to prevent oxidation, the patent achieves reliable performance with cheaper materials, making multilayer bending elements economically viable for mass market applications
2Power
If electrodynamic vibration exciters are used to generate sound waves, then sound pressure level is achieved, but device weight and volume increase significantly
Solution Approach 1:
The patent replaces electrodynamic vibration exciters with piezoelectric multilayer bending elements. This substitution uses piezoelectric effect (electrical-to-mechanical energy conversion) instead of electromagnetic induction, enabling compact, lightweight construction while maintaining high sound pressure levels and broad frequency coverage
Solution Approach 2:
The patent changes the actuation mechanism from electromagnetic to piezoelectric, fundamentally altering the physical principles involved. This enables miniaturization and weight reduction while preserving acoustic performance, making the system suitable for portable and compact audio devices
3Ease of operation
If bending elements are optimized for specific vibrating structures to achieve neutral sound radiation, then sound quality is improved, but device complexity and geometry optimization requirements increase
Solution Approach 1:
The patent develops multilayer bending elements with universal applicability through standardized electrode patterns and flexible piezoelectric layer configurations. The design can be adapted to various vibrating structures (membranes, plates, shells) without requiring custom geometry optimization for each application, simplifying the design process while maintaining high sound quality
Solution Approach 2:
The patent segments the bending element into modular layers (electrodes, piezoelectric layers, inactive layers) that can be independently optimized and combined. This modular approach allows flexible adaptation to different applications while using standardized manufacturing processes, reducing overall system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the production of compact, cost-effective multilayer bending elements that maintain high sound pressure levels and neutral sound radiation across a wide frequency band, suitable for both small and large devices, while reducing the complexity and cost associated with precious metal usage.
Implementation Method 1
stacks of layers, each with 1-400 layers of piezoelectrically active material
Implementation Method 2
piezoelectric material has such a sufficient activity in a thermal process that sintering below the melting temperature of the material of the internal electrodes is possible
Data Source
Figure 1~2
Figure 3a~3f
Figure 3g
AI summary
The invention specifies a method for producing a component as monolithic multilayer element or multilayer bending element, comprising at least two layer stacks (1) each having 1-400 layers of piezoelectrically active material which are separated by at least one layer stack (2) comprising 0-100 layers of piezoelectrically inactive material, wherein the inner electrodes of the active layer stacks contain at least the following materials: a) pure silver b) electrically non-conductive material having a proportion by weight of 0% to at most 30% and the material of the piezoelectrically active layers has a sufficient activity in a thermal process such that sintering below the melting point of the material of the inner electrodes is possible and is actually performed.