Computing Case Button Structure for Touch and Force Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional computing device cases limit input functionality to affirmative click depression, failing to accommodate nuanced user inputs such as taps, swipes, and finger proximity sensing.
Innovation Solution
A case with a button body that is movable and biased by structures like magnets or elastically compliant seals, allowing for capacitive and force sensing through materials with specific dielectric constants, and seals to maintain clean contact interfaces for varied user inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional button case is used with simple click depression functionality, then the device structure remains simple, but input functionality is limited
Solution Approach 1:
The button body is designed to be movable rather than fixed, allowing it to respond to various input forces. The biasing structure enables the button to dynamically adjust its position based on applied pressure, facilitating multiple input modes (tap, press, hold) while maintaining a relatively simple overall case structure.
Solution Approach 2:
The patent utilizes changes in physical parameters such as dielectric constant of materials and force magnitude to enable different sensing modes. By selecting materials with specific dielectric constants and designing the biasing structure to provide controlled preload forces, the system can detect both capacitive touch and force-sensitive inputs through the same button structure.
2Adaptability or versatility
If materials with specific dielectric constants are used for capacitive sensing, then capacitive touch sensing is enabled, but material selection becomes more constrained
Solution Approach 1:
The button assembly utilizes composite material construction, combining materials with different dielectric constants in specific layers. This allows the system to achieve capacitive sensing functionality while maintaining manufacturing feasibility, as each layer can be optimized independently for its specific function.
Solution Approach 2:
The button body acts as an intermediary element between the user's finger and the sensing mechanisms. By incorporating materials with appropriate dielectric constants in the button, the system can transmit capacitive signals effectively while the button itself remains a separate, manufacturable component.
3Measurement precision
If seals are added to maintain clean contact interfaces, then sensor accuracy is maintained, but device complexity increases
Solution Approach 1:
The sealing implementation uses flexible seal elements that can conform to the contact interface geometry. These thin, adaptable seals effectively prevent contaminant ingress while maintaining the necessary button movement and contact pressure, avoiding the need for complex rigid sealing mechanisms.
Solution Approach 2:
The biasing structure provides a preload force that ensures the button maintains consistent contact with the sensing surface. This self-adjusting mechanism compensates for variations in assembly tolerances and wear over time, maintaining sensor accuracy without requiring additional active control systems.
4Reliability
If a biasing structure with preload force is implemented, then button contact and sensing reliability improve, but manufacturing precision requirements increase
Solution Approach 1:
The biasing structure is designed to provide a predetermined preload force that compensates for potential gaps or variations in the assembly. This pre-applied force ensures reliable button contact with the sensing surface from the outset, accommodating normal manufacturing tolerances without requiring ultra-precise assembly.
Solution Approach 2:
The patent specifies a range for the preload force (8-30 grams-force) rather than a single precise value. This parameter range approach allows manufacturers to achieve reliable button contact within normal tolerances, balancing reliability requirements with manufacturing feasibility.
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 wide range of user inputs, including capacitive touch sensing and force detection, while preventing contaminant ingress and maintaining sensor accuracy.
Implementation Method 1
In some examples, the biasing structure includes an elastically compliant seal
Implementation Method 2
the biasing structure includes at least one of a magnet or a ferromagnetic insert
Implementation Method 3
A case with a button body that is movable and biased by structures like magnets or elastically compliant seals, allowing for capacitive and force sensing through materials with specific dielectric constants
Implementation Method 4
seals to maintain clean contact interfaces for varied user inputs
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.