Composite Piezoelectric Element for Slim Multifunction Electronics
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Solution Overview
Problem
Current electronic devices face challenges in miniaturization and slimness due to the need for separate components for various functions such as haptic, speaker, and finger scan recognition, which complicates integration and increases size.
Innovation Solution
A composite piezoelectric element is developed, comprising alternately arranged insulating films and piezoelectric bodies, including ultrasonic oscillating and reception piezoelectric bodies with cavities, and optionally polymer and metal components, to perform multiple functions like haptic, speaker, and finger scan recognition, facilitating miniaturization and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent devices are built for each function (haptic, speaker, receiver, finger scan recognition), then each function can be performed reliably, but the device size increases and miniaturization becomes difficult
Solution Approach 1:
The patent combines multiple independent piezoelectric bodies (first piezoelectric body for haptic function, second piezoelectric body for speaker function, third piezoelectric body for receiver function, and fourth piezoelectric body for finger scan recognition) into a single integrated composite piezoelectric element. This merging approach maintains the reliability of each individual function while significantly reducing the overall device volume by eliminating the need for separate independent devices for each function.
Solution Approach 2:
The composite piezoelectric element is designed as a multi-functional device where a single element performs multiple functions: haptic actuation, speaker operation, receiver functionality, and finger scan recognition. This universality principle allows one device to replace four separate devices, directly addressing the contradiction between maintaining functional reliability and reducing device volume.
2Adaptability or versatility
If multiple independent devices are used for various functions, then each function operates independently, but the electronic device cannot achieve miniaturization and slimness
Solution Approach 1:
The patent merges multiple piezoelectric bodies into a single composite structure with integrated electrodes and cavities. This combining approach reduces the cumulative thickness that would result from stacking separate independent devices, thereby enabling miniaturization and slimness while maintaining all required functions.
Solution Approach 2:
The patent employs a nested structure where cavities are formed within the piezoelectric bodies themselves (first cavity in the first piezoelectric body, second cavity in the second piezoelectric body, etc.). This nesting allows the functional components to be embedded within the material structure rather than occupying separate external spaces, significantly reducing the overall device thickness and enabling slimness.
3Volume of moving object
If a single composite piezoelectric element is used for multiple functions, then miniaturization and slimness are achieved, but the structural complexity increases
Solution Approach 1:
The patent segments the composite piezoelectric element into distinct functional regions with separate piezoelectric bodies (first, second, third, and fourth piezoelectric bodies), each dedicated to a specific function. This segmentation allows the complex multi-functional element to be designed and manufactured by assembling standardized modular units, thereby managing structural complexity while achieving miniaturization.
Solution Approach 2:
The patent applies local quality by providing different cavity configurations in different regions of the composite element. The first piezoelectric body has a first cavity optimized for haptic function, the second piezoelectric body has a second cavity optimized for speaker function, and so on. This localized optimization allows each region to perform its specific function efficiently while maintaining the integrated compact structure.
4Reliability
If cavities are formed in piezoelectric bodies for resonating ultrasonic waves, then ultrasonic oscillation strength and reception sensitivity are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the cavity depths to specific ranges (first cavity depth of 10-50 μm, second cavity depth of 10-50 μm, third cavity depth of 10-50 μm, fourth cavity depth of 10-50 μm) to achieve the desired ultrasonic resonance. By defining specific parameter ranges rather than requiring exact precise values, the patent maintains high ultrasonic oscillation strength and reception sensitivity while making the manufacturing process more feasible and less demanding in terms of precision.
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 composite piezoelectric element enables the integration of multiple functions into a single film-type device, enhancing miniaturization and slimness of electronic devices while maintaining flexibility and improved performance in ultrasonic oscillation and reception.
Implementation Method 1
a piezoelectric body used for a haptic function, a speaker function, a receiver function and a finger scan recognition function
Implementation Method 2
an ultrasonic oscillating piezoelectric body for oscillating ultrasonic waves for finger scan recognition
Implementation Method 3
A first cavity may be formed in the ultrasonic oscillating piezoelectric body, and a second cavity may be formed in the ultrasonic reception piezoelectric body
Data Source
AI summary
A composite piezoelectric element and an electronic device having the same are disclosed, in which the composite piezoelectric element includes insulating films and piezoelectric bodies, which are alternately arranged, wherein the piezoelectric bodies may be categorized into general piezoelectric bodies used as at least one of a haptic actuator, a speaker actuator and a receiver actuator, and a finger scan recognition piezoelectric body for finger scan recognition.