Flexible Membrane Scroll Input With Thermal Sensor Calibration

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Solution Overview

Problem

Mechanical support systems in miniaturized electronic devices face limitations due to strength-to-weight considerations, leading to structural instability and inefficiencies, while capacitive sensors struggle with calibration in rapidly changing temperature conditions, causing device failures and reduced tactile responsiveness.

Innovation Solution

A scrolling input arrangement featuring a flexible membrane with radially disposed capacitive sensors, an integrated circuit for signal processing, and a connection region for electronic coupling, along with methods for calibrating sensors in response to temperature gradients, and a backing plate with actuator nubs for mechanical support and tactile feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a rigid PCB is used to provide structural support, then structural stability is improved, but device thickness increases and tactile responsiveness decreases

Engineering Contradiction:

Improvestructural stabilityVSAvoiddevice thickness

Core Design Contradiction:

Stability of the object's compositionVSLength of stationary object

Solution Approach 1:

The patent replaces the rigid PCB with a flexible membrane that provides structural support while enabling thinness. The flexible membrane mechanically couples the capacitive sensors and allows the device to achieve a thinner profile while maintaining durability and tactile responsiveness through its inherent flexibility and mechanical properties.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent substitutes the traditional rigid mechanical PCB structure with a flexible membrane-based mechanical system. This substitution allows the device to achieve both structural stability and thinness by utilizing the flexible membrane's mechanical properties rather than relying on rigid support structures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If electronic components are co-located with the PCB, then structural integration is improved, but device stack height increases and reliability decreases

Engineering Contradiction:

Improvestructural integrationVSAvoidcomponent reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The flexible membrane serves as the structural substrate that integrates electronic components without requiring co-location on a rigid PCB. This allows components to be distributed and connected through the flexible membrane's conductive traces, reducing stack height and eliminating stress-related reliability issues while maintaining structural integration.

Inventive Principle:

Principle #30Flexible shells and thin films

3Ease of operation

If capacitive sensors are used in rapidly changing temperature conditions, then sensing capability is maintained, but calibration accuracy deteriorates

Engineering Contradiction:

Improvesensing capabilityVSAvoidcalibration accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent implements a calibration method that uses feedback from the capacitive sensors themselves to detect and compensate for temperature-induced drift. By monitoring sensor readings and adjusting calibration parameters based on temperature gradients, the system maintains measurement precision while preserving sensing capability in rapidly changing temperature conditions.

Inventive Principle:

Principle #23Feedback

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 solution provides a thinner, more durable, and responsive scrolling input mechanism with improved tactile feedback and thermal calibration, reducing device failures and enhancing user interaction in varying temperature environments.

Implementation Method 1

capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS7671837B2Scrolling input arrangements using capacitive sensors on a flexible membrane

Publication Date: 2010.03.02 APPLE INC

AI summary

Scrolling input arrangements are presented including: a flexible membrane; a number of capacitive sensors mechanically integrated with the flexible membrane, the capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane; an integrated circuit mechanically coupled with the flexible membrane and electronically coupled with the capacitive sensors, the integrated circuit configured to process a number of electronic signals from the capacitive sensors to provide a scrolling function; and a connection region on the flexible membrane for electronically coupling the scrolling input arrangement with an electronic device. In some embodiments, the capacitive sensors are configured with a plate element having a first surface area and a trace element having a second surface area such that the first surface area and second surface area comprise a sensor surface area, wherein the sensor surface areas for the capacitive sensors is substantially equal in size.