Locally-Flexible Enclosure Regions for Integrated Haptic Interfaces
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Solution Overview
Problem
Conventional electronic device enclosures with integrated user interface surfaces, such as trackpads, are structurally weakened due to openings, increasing manufacturing complexity and susceptibility to damage.
Innovation Solution
An electronic device enclosure with integrated force input/haptic output interfaces, featuring locally-flexible regions defined by reduced-thickness sections and support structures, where force transducers like piezoelectric elements induce bending moments to generate haptic outputs through the external surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an opening is created in the enclosure to accommodate a user interface surface, then the user interface functionality is enabled, but the structural integrity and durability of the enclosure are weakened
Solution Approach 1:
The enclosure is segmented into multiple layers: an external surface layer, an intermediate frame layer with locally-flexible regions, and an internal support structure. This segmentation allows the user interface surface to be integrated without compromising the overall structural integrity, as each layer performs its specific function independently.
Solution Approach 2:
The frame includes locally-flexible regions with reduced thickness specifically at the user interface location, while other regions maintain full thickness for structural support. This local quality variation enables the enclosure to provide both user interface functionality and structural strength in different areas.
2Ease of operation
If an opening is created in the enclosure for the user interface surface, then the user interface is accessible, but manufacturing complexity increases
Solution Approach 1:
The frame is merged with the enclosure structure, and the user interface surface is integrated directly into the frame's locally-flexible regions. This merging eliminates the need for separate openings and complex assembly steps, simplifying manufacturing while maintaining user interface accessibility.
Solution Approach 2:
The frame serves multiple functions: it provides structural support, integrates the user interface surface, and houses the haptic actuators. This multi-functionality reduces the number of separate components and simplifies the manufacturing process.
3Ease of operation
If the enclosure thickness is reduced to integrate the user interface surface, then the user interface is accessible, but the susceptibility to damage increases
Solution Approach 1:
The enclosure maintains full thickness in most regions for durability, while locally-reducing thickness only in specific regions where user interface access is required. The locally-flexible regions are strategically positioned to provide access without compromising overall reliability.
Solution Approach 2:
The frame structure with locally-flexible regions is pre-designed and pre-assembled into the enclosure before final assembly. This preliminary action ensures that the structural integrity is maintained while the user interface accessibility is built-in from the start, preventing later damage susceptibility.
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
Enhances structural integrity while providing effective haptic feedback without compromising the enclosure's durability, simplifying manufacturing and reducing damage susceptibility.
Implementation Method 1
A force transducer (such as a piezoelectric element) is coupled to the support structure. As a result of this construction, an actuation of the force transducer induces a bending moment into the support structure to generate a haptic output through the external surface.
Data Source
AI summary
A force input/haptic output interface for an electronic device can include a force input sensor and a haptic actuator. In one example, the force input sensor and the haptic actuator are accommodated on a frame positioned below an input surface. In many examples, the frame includes relieved portions that redirect and/or concentrate compression or tension in the haptic actuator into the frame.