Computing Case Button Structure for Capacitive and Force Input
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Solution Overview
Problem
Traditional computing device cases limit input functionality to affirmative click depressions, failing to accommodate nuanced user inputs such as taps, swipes, and capacitive touches.
Innovation Solution
A case with a button that includes biasing structures and seals to maintain intimate contact with the device button, enabling capacitive sensing and a variety of user inputs through conductive pads and high dielectric materials, allowing for capacitive and force sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional button structure is used in the case, then the case provides protective functionality, but the input functionality is limited to simple affirmative click depression
Solution Approach 1:
The case button is designed to support multiple input modalities including capacitive touch, force sensing, and click depression through a unified structure. The button body with conductive pads and high dielectric material enables both capacitive sensing and mechanical force detection, allowing a single component to serve multiple input functions rather than requiring separate buttons for each input type
Solution Approach 2:
The case button acts as an intermediary between the user and the device button, transferring both capacitive touch inputs and mechanical force inputs from the user's finger through the button body to the device button. The conductive pads and high dielectric material in the button body facilitate this intermediary function by maintaining electrical coupling while providing mechanical contact
2Reliability
If the button body is positioned away from the device button, then contaminant ingress is prevented, but sensor detectability is reduced
Solution Approach 1:
The patent replaces direct mechanical contact between the case button and device button with a capacitive coupling mechanism. The high dielectric material in the button body enables capacitive sensing that can detect user inputs without requiring intimate physical contact, thereby maintaining sensor detectability while reducing contaminant ingress risks
Solution Approach 2:
The button body with high dielectric material serves as an intermediary that maintains electrical coupling between the user's finger and the device button through capacitive fields. This intermediary structure allows the button to be positioned at an optimal distance that balances contaminant protection with sensor detectability, as the capacitive field can penetrate the dielectric material effectively
3Ease of manufacture
If the case button structure is simplified, then manufacturing is easier, but capacitive and force sensing capabilities are lost
Solution Approach 1:
The button body is constructed from composite materials including conductive pads, high dielectric material, and force sensing elements integrated into a single manufacturable component. This composite structure enables multiple sensing capabilities (capacitive and force sensing) to be achieved through material properties rather than complex mechanical assemblies, simplifying manufacturing while maintaining advanced functionality
Solution Approach 2:
The patent merges multiple functional elements (conductive pads, dielectric material, force sensing mechanism) into a single integrated button body structure. This consolidation combines what would traditionally be separate components into one manufacturable unit, enabling capacitive and force sensing capabilities without requiring complex assembly processes
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
Enables a wider range of user inputs, including capacitive touches and force interactions, while maintaining sensor detectability and preventing contaminant ingress.
Implementation Method 1
a biasing structure having a contact surface configured to contact the button body, the biasing structure configured to bias the button body toward the interior surface along the axis of button travel
Implementation Method 2
the cap having a dielectric constant greater than 10
Implementation Method 3
enabling capacitive sensing and a variety of user inputs through conductive pads and high dielectric materials
Implementation Method 4
Ink material positioned between the button body and the cap
Implementation Method 5
the seal being configured to inhibit contaminant ingress between the device housing and the frame
Data Source
AI summary
A case for an electronic device can include a case body including an exterior surface and an interior surface, the interior surface being positioned opposite the exterior surface. The case can additionally include a button body positioned at least partially within the case body between the exterior surface and the interior surface, the button body being movable inward and outward relative to the case body along an axis of button travel. The case can further include a biasing structure having a contact surface configured to contact the button body, the biasing structure configured to bias the button body toward the interior surface along the axis of button travel.