Computing Device Case with Biasing Structure for Multi-Modal Input

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Solution Overview

Problem

Traditional portable computing device cases limit input functionality by only providing an affirmative click depression that corresponds to a device button click, lacking advanced input capabilities such as capacitive sensing and force sensing.

Innovation Solution

A case design that includes a button body movable within the case, a biasing structure to preload the button and maintain contact with the device button, and materials with specific dielectric constants to enable capacitive sensing and force detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a traditional button case is used, then the case provides protection and basic click functionality, but it limits input functionality and lacks advanced sensing capabilities

Engineering Contradiction:

Improveinput functionalityVSAvoidcase structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The button assembly is designed to provide multiple input modalities through a single integrated structure. The button body with capacitive sensing capability, force sensing capability, and mechanical click capability all reside within one case component, allowing the case to serve as both protective enclosure and advanced input device

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The button body acts as an intermediary element between the user and the device button. It transfers mechanical force while also providing capacitive coupling for touch sensing and force sensing, mediating multiple types of user input without requiring direct device contact

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a simple button structure is used, then the case is easy to manufacture, but it only provides affirmative click depression without advanced input capabilities

Engineering Contradiction:

Improvesensing capabilitiesVSAvoidbutton structure

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

Multiple sensing functions are merged into the button body component. The capacitive sensing electrodes, force sensing mechanism, and mechanical button structure are integrated into a single manufacturable part, reducing the number of separate components while achieving advanced sensing capabilities

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The button body utilizes material property parameters to enable different sensing modalities. By selecting materials with appropriate dielectric constants for capacitive sensing and appropriate mechanical properties for force sensing, the design achieves multiple functions through material parameter optimization rather than complex structural additions

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the button is not preloaded, then the button can move freely, but it cannot maintain consistent contact with the device button for reliable sensing

Engineering Contradiction:

Improvecontact consistencyVSAvoidpreload force

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The biasing structure applies a preliminary preload force to the button body, positioning it in consistent contact with the device button before user interaction. This preliminary action ensures reliable baseline contact for capacitive and force sensing while allowing the button to still respond to user inputs

Inventive Principle:

Principle #10Preliminary action

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 case enhances input functionality by allowing for a range of user inputs including taps, swipes, and force applications, while maintaining a secure and protective enclosure for the computing device.

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

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

the case button being movable inward and outward relative to the case body... enable capacitive sensing and force detection

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 3

allowing for a range of user inputs including taps, swipes, and force applications

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS12287680B1Computing device case

Publication Date: 2025.04.29 APPLE INC

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.