Ultrasonic Sensor Chemically Strengthened Glass Substrate
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Solution Overview
Problem
Conventional ultrasonic sensors face limitations in durability and performance due to the use of traditional glass substrates, which can be prone to breakage and do not provide sufficient mechanical strength for applications requiring robustness.
Innovation Solution
The use of chemically strengthened glass as a substrate in ultrasonic sensors, which is treated with a high-temperature potassium nitrate solution to replace sodium ions with potassium ions, creating a strengthened layer with surface compression exceeding 200 MPa and a depth of layer exceeding five micrometers, enhancing the mechanical properties of the glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional glass substrate is used in ultrasonic sensors, then manufacturing simplicity is maintained, but durability and mechanical strength deteriorate
Solution Approach 1:
The glass substrate undergoes chemical strengthening treatment in advance by immersing it in a high-temperature potassium nitrate solution, which replaces sodium ions with potassium ions to create a compressed surface layer. This preliminary action enhances the mechanical strength and durability before the substrate is assembled into the ultrasonic sensor, resolving the contradiction between maintaining manufacturing simplicity and improving strength.
2Reliability
If conventional glass substrate is used, then ease of manufacture is maintained, but resistance to external pressures and stresses deteriorates
Solution Approach 1:
The chemical composition and physical properties of the glass substrate are changed by immersing it in a high-temperature potassium nitrate solution. This process alters the ion distribution within the glass, replacing softer sodium ions with harder potassium ions, thereby changing the material parameters to achieve surface compression exceeding 200 MPa and significantly improving durability and resistance to external pressures.
3Strength
If traditional glass substrate is used, then manufacturing simplicity is maintained, but performance under stress deteriorates
Solution Approach 1:
The glass substrate is transformed into a composite structure with enhanced properties through ion exchange. The outer layer contains potassium ions that create compressive stress, while the inner layer retains the original glass composition. This composite material structure provides superior surface compression and stress resistance compared to conventional glass, resolving the contradiction between improving strength and maintaining manufacturing simplicity.
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 chemically strengthened glass substrate significantly improves the durability and mechanical strength of ultrasonic sensors, making them more resistant to external pressures and stresses, thereby enhancing their reliability and performance in various applications, including fingerprint recognition in electronic devices.
Implementation Method 1
treated with a high-temperature potassium nitrate solution to replace sodium ions with potassium ions, creating a strengthened layer with surface compression exceeding 200 MPa
Data Source
AI summary
An ultrasonic sensor includes a first electrode, a first piezoelectric layer, a substrate, a second electrode, a second piezoelectric layer, and a third electrode. The first electrode and the first piezoelectric layer are stacked on a first surface of the substrate. The second electrode, the second piezoelectric layer, and the third electrode are stacked on a second surface opposite to the first surface of the substrate. The substrate is made of chemically strengthened glass.