Encapsulated PZT Ceramic Element Edge Protection
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Solution Overview
Problem
PZT ceramic elements are prone to breakage, surface damage, and particle release during processing and use due to exposed edges and surfaces, which can lead to product contamination in applications like disk drives.
Innovation Solution
Encapsulating PZT elements with a layer of epoxy or similar protective material and applying metallization on the surfaces and edges to protect and strengthen them, while preventing particle release, through a method involving cutting, filling with encapsulation material, curing, grinding, and applying metallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PZT elements are cut into smaller pieces from a wafer, then productivity increases, but the exposed edges and surfaces cause breakage and damage
Solution Approach 1:
The patent applies preliminary action by coating the PZT wafer with encapsulation material and metallization layers before cutting. This pre-protection ensures that when the wafer is diced into individual elements, the edges and surfaces are already protected, preventing breakage and particle release during subsequent handling and assembly processes.
Solution Approach 2:
The encapsulation material serves as a cushioning layer applied beforehand to protect the fragile PZT edges. The metallization layer provides additional structural reinforcement before the cutting process, acting as a protective shell that prevents damage during the mechanical stress of dicing and subsequent assembly operations.
2Length of moving object
If thin PZT elements are used, then device miniaturization is achieved, but breakage during processing increases
Solution Approach 1:
The patent creates a composite structure by combining the thin PZT element with encapsulation material and metallization layers. This composite construction provides the mechanical strength needed to handle thin elements without breakage, while the PZT core maintains its required thinness for device miniaturization and acoustic performance.
Solution Approach 2:
The encapsulation material forms a protective shell around the thin PZT element, providing mechanical support and protection. This shell allows the element to be thin for miniaturization while the encapsulation layer compensates for the reduced structural integrity, preventing breakage during processing and assembly.
3Ease of manufacture
If conventional cutting methods are used, then manufacturing simplicity is maintained, but particle release into products occurs
Solution Approach 1:
The patent applies preliminary action by coating the PZT wafer with encapsulation material and metallization layers before cutting. This pre-protection ensures that when the wafer is diced into individual elements, the edges and surfaces are already protected, preventing breakage and particle release during subsequent handling and assembly processes.
Solution Approach 2:
The encapsulation material acts as an intermediary barrier between the PZT ceramic and the external environment. This intermediate layer prevents direct contact and potential contamination from PZT particles, while the metallization layer provides an additional protective barrier, ensuring product cleanliness without complicating the manufacturing process.
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 encapsulation method effectively protects PZT elements from damage, strengthens them, and prevents particle release, ensuring reliability and cleanliness in their use, particularly in sensitive applications like disk drives.
Implementation Method 1
filling the plurality of recesses with an encapsulation material to define a wafer with a plurality of first spaced-apart layers of encapsulation material
Implementation Method 2
grinding away at least the base of the wafer
Data Source
AI summary
A PZT (lead zirconate titanate) element including one or more outside surfaces including a layer of encapsulation and metallization material and the method of making the same including at least the steps of providing a wafer of ceramic material including a base and one or more walls defining one or more recesses in the wafer which are filled with an encapsulation material. The encapsulation material is then cured and a layer of metallization is applied to one or more of the outside surfaces of the wafer and encapsulation material. Cuts are then made through the layer of metallization and cured encapsulation material to divide the wafer into a plurality of individual and separate ceramic elements with one or more surfaces including a layer of metallization and encapsulation.