Piezo Haptic Device Integrated Support Prevents Over-Bending
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Solution Overview
Problem
Existing haptic feedback devices using inertial actuators are limited by mechanical complexity and size, while piezoelectric devices face challenges in preventing over-bending of piezoelectric elements, which can lead to breakage and affect haptic feedback precision.
Innovation Solution
A piezoelectric haptic feedback device with a conductive base plate and integrated support that allows for controlled bending of the piezoelectric element and base plate, preventing over-bending while enabling precise haptic feedback and touch sensing through a combination of voltage-induced strain and mechanical support structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piezoelectric element is allowed to bend freely for haptic feedback, then haptic feedback precision is improved, but the piezoelectric element may break due to over-bending
Solution Approach 1:
The patent introduces a support plate as an intermediary component between the piezoelectric element and the base plate. This support plate provides mechanical reinforcement to prevent over-bending and breakage of the piezoelectric element, while still allowing sufficient bending motion for haptic feedback. The support plate acts as a mediator that protects the fragile piezoelectric element without completely restricting its functional movement.
2Reliability
If a support structure is added to prevent over-bending, then piezoelectric element durability is improved, but device complexity increases
Solution Approach 1:
The support plate is integrated with the base plate structure, merging two functions (support and base) into a single component. This integration reduces the number of separate parts and simplifies the overall device structure while still providing the necessary protection against over-bending. The support plate becomes an inherent part of the base plate assembly rather than a separate additive component.
3Adaptability or versatility
If inertial actuators are used for haptic feedback, then haptic feedback functionality is achieved, but device size and mechanical complexity increase
Solution Approach 1:
The patent replaces the traditional inertial actuator mechanism with a piezoelectric-based system. Instead of using a mechanical mass that moves to create haptic feedback, the invention uses piezoelectric elements that convert electrical signals directly into mechanical strain and bending motion. This substitution eliminates the need for heavy mechanical components, significantly reducing device size and mechanical complexity while maintaining haptic feedback functionality.
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 precise haptic feedback and touch sensing with reduced noise and increased reliability, allowing for smaller device size and improved manufacturing efficiency, while preventing piezoelectric element breakage and enhancing robustness.
Implementation Method 1
a piezoelectric element configured to convert an electrical voltage into a mechanical strain
Implementation Method 2
the piezoelectric element and the conductive base plate are configured to detect touch
Data Source
AI summary
According to an embodiment, a device comprises: a piezoelectric element configured to convert an electrical voltage into a mechanical strain; and a conductive base plate onto which the piezoelectric element is fastened, wherein the conductive base plate comprises an integrated support positioned on an underside of the conductive base plate, wherein the conductive base plate is supported by the integrated support; wherein the device is configured to provide haptic feedback on a basis of the mechanical strain.