Bi-La-Fe-Mn Piezoelectric Material for Lead-Free Inkjet Heads
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Solution Overview
Problem
Existing piezoelectric materials used in liquid-ejecting heads, such as ink jet print heads, face challenges with high lead content, leading to environmental concerns and reduced strain performance, particularly in lead-free alternatives with ABO3 perovskite structures.
Innovation Solution
A piezoelectric element with a perovskite complex oxide containing Bi, La, Fe, and Mn, which undergoes electric-field-induced phase transitions, reducing lead content and enhancing strain performance while maintaining excellent insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-free piezoelectric materials with ABO3 perovskite structure are used, then environmental load is reduced, but strain performance decreases
Solution Approach 1:
The patent employs a composite piezoelectric material system with a perovskite structure containing Bi, La, Fe, and Mn elements. This composite approach combines multiple metallic elements to achieve both low environmental impact (lead-free) and high strain performance through synergistic material properties
Solution Approach 2:
The patent optimizes the compositional parameters of the perovskite complex oxide by controlling the ratios of Bi, La, Fe, and Mn elements. By adjusting these chemical composition parameters, the material achieves enhanced piezoelectric characteristics and strain performance while maintaining lead-free composition
2Reliability
If conventional piezoelectric materials are used, then strain performance is maintained, but lead content increases causing environmental concerns
Solution Approach 1:
The patent fundamentally changes the compositional parameters by eliminating lead (Pb) from the material system. The optimized perovskite structure with Bi, La, Fe, and Mn elements achieves comparable or superior piezoelectric properties to conventional lead-based materials while being environmentally friendly
Solution Approach 2:
The patent extracts and removes the harmful lead component from the piezoelectric material system. By completely eliminating Pb and replacing it with an optimized combination of Bi, La, Fe, and Mn elements, the invention achieves both environmental compatibility and functional performance
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 use of Bi, La, Fe, and Mn-based perovskite complex oxides in piezoelectric elements reduces environmental impact and achieves higher strain levels, stabilizing voltage for controlled performance and preventing dielectric breakdown.
Implementation Method 1
the piezoelectric layer contains a perovskite complex oxide containing Bi, La, Fe, and Mn and can undergo electric-field-induced phase transition
Implementation Method 2
A piezoelectric material that contains a perovskite complex oxide containing Bi, La, Fe, and Mn and can undergo electric-field-induced phase transition is an antiferroelectric substance
Data Source
AI summary
A liquid-ejecting head includes a pressure-generating chamber communicating with a nozzle opening, and a piezoelectric element. The piezoelectric element has piezoelectric layer contains a perovskite complex oxide containing Bi, La, Fe, and Mn and can undergo electric-field-induced phase transition.