Conductive Casing Grooves for Reconfigurable Capacitive Buttons

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Solution Overview

Problem

Mechanical side buttons in portable devices require direct connection to the PCB for functionality, limiting design flexibility and increasing device thickness, while also providing tactile feedback that may not be preferred in all scenarios.

Innovation Solution

A device with conductive elements featuring grooves of lower conductivity than the surrounding material, where capacitive field measurement elements detect changes in capacitance to trigger functions, eliminating the need for direct PCB connection and allowing reconfigurable button functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical buttons are directly connected to the PCB, then the buttons can perform their functions reliably, but the device thickness increases and design flexibility is limited

Engineering Contradiction:

Improvebutton functionalityVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent replaces the mechanical connection system (physical buttons directly connected to PCB) with a capacitive sensing system. The conductive casing with grooves acts as a capacitive sensor that detects button presses through changes in capacitance, eliminating the need for mechanical connectors and reducing device thickness while maintaining functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The conductive casing serves multiple functions: it provides structural support, acts as a capacitive sensing element for button detection, and eliminates the need for separate button components. This multi-functionality reduces the number of parts and simplifies the overall device structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If mechanical buttons are directly connected to the PCB, then the buttons provide stable functionality, but the placement and reconfiguration of buttons is limited

Engineering Contradiction:

Improvebutton functionalityVSAvoidbutton placement flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent enables dynamic reconfiguration of button functionality through software control. The capacitive sensing system can be programmed to assign different functions to different regions of the conductive casing, allowing buttons to be repositioned and reconfigured without physical modifications to the device structure.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

By replacing the mechanical button-PCB connection system with a capacitive sensing system, the patent enables flexible placement of button functions anywhere on the conductive casing surface,不受限于 physical connector locations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If mechanical buttons are used, then tactile feedback is provided to users, but the device complexity and assembly requirements increase

Engineering Contradiction:

Improvetactile feedbackVSAvoidassembly complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent merges the button structure with the conductive casing itself. The grooves in the conductive casing create the button regions, eliminating the need for separate button components and simplifying assembly while maintaining tactile feedback through the capacitive sensing mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The conductive casing serves its own dual purpose: providing both structural support and capacitive sensing functionality. The grooves in the casing create the button regions, and the casing itself acts as the sensing element, eliminating the need for separate sensing components.

Inventive Principle:

Principle #25Self-service

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 flexible placement and reconfiguration of buttons without the need for direct circuitry connection, reducing device thickness and providing tactile feedback through capacitive sensing, enhancing design flexibility and user interaction.

Implementation Method 1

a capacitive field measurement element coupled to the conductive element, wherein the capacitive field measurement element is configured to measure change in the capacitive field in proximity of the one or more grooves caused by physical interaction or proximity between the one or more grooves and an external object

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS10908742B2Device with grooves in conductive casing

Publication Date: 2021.02.02 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

A device is provided. The device comprises a conductive element comprising one or more grooves, a capacitive field measurement element coupled to the conductive element, and a controller coupled to the capacitive field measurement element. The grooves comprise material with conductivity lower than the conductivity of the conductive element. The capacitive field measurement element is configured to measure change in the capacitive field in proximity of the grooves caused by physical interaction or proximity between the grooves and an external object, and provide the measurement to the controller. The controller is configured to trigger at least one function assigned to the one or more grooves when a change in the capacitive field in proximity of the one or more grooves is measured. Methods of operation and manufacture are also presented.