Accelerometer-Based Gesture Input for Portable Devices

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Solution Overview

Problem

Conventional portable devices rely on additional input elements and limited motion sensing, making traditional button or handwriting entry inefficient for command control and data input, especially as devices become more sophisticated.

Innovation Solution

Integration of a motion-sensing device, such as an accelerometer, within the portable device to detect and analyze one-, two-, or three-axes of motion, magnitude, and rate of change of movement, enabling command control and data input by comparing detected motion patterns with pre-determined gestures stored in memory.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional button or handwriting entry is used for command control and data input, then the device structure remains simple, but the input efficiency becomes insufficient for sophisticated devices

Engineering Contradiction:

Improveinput efficiencyVSAvoiddevice structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The portable device uses its own motion sensing capabilities to perform input functions, eliminating the need for separate input devices. The accelerometer within the device detects user gestures and movements, allowing the device to serve itself for both sensing and processing, thereby improving input efficiency without adding external complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The motion sensing accelerometer serves multiple functions: it acts as both the sensing element for detecting user input and the processing element for interpreting gestures. This multi-functionality allows a single component to handle both detection and control, improving productivity while maintaining structural simplicity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If additional input elements like stylus or digital pen are added, then handwriting input capability is improved, but the device complexity increases

Engineering Contradiction:

Improveinput capabilityVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention extracts the input sensing function from separate physical elements (stylus, pen, mouse) and integrates it into the device itself through the accelerometer. By taking out the need for external input devices and embedding motion sensing directly in the portable device, versatility is maintained while structural complexity is reduced

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The sensing function and processing function are merged into a single integrated system within the portable device. The accelerometer both detects motion and the system processes this data for input commands, combining what were previously separate functions into one unified structure

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If motion sensing is used to detect only relative movement of stylus or mouse, then input detection is simplified, but the input efficiency and sophistication are limited

Engineering Contradiction:

Improveinput efficiencyVSAvoidmotion detection complexity

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The invention replaces traditional mechanical input systems (stylus movement, mouse tracking) with an accelerometer-based detection system. This substitution allows the device to detect absolute motion and orientation changes directly, enabling more sophisticated gestures and improving input efficiency without being limited to simple relative movement tracking

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 efficient and intuitive command control and data input using the portable device itself, allowing for complex gestures and functions like scrolling, navigating, and air-writing, enhancing user interaction with portable devices.

Implementation Method 1

The motion-sensing device, e.g., at least one accelerometer, is fixedly attached to or embedded in the portable device and, moreover, is structured and arranged to sense or to detect one-, two- or three-axes of motion or movement of the portable device

Methodology Applied

Scientific EffectAccelerometer: Accelerometer

Data Source

PatentUS7667686B2Air-writing and motion sensing input for portable devices

Publication Date: 2010.02.23 MEMSIC

AI summary

The use of motion sensing to perform sophisticated command control and data input into a portable device is disclosed. A motion sensor is embedded or fixedly attached to a portable device to measure movement, motion or tilt of the device in one-, two- or three-dimensions when the portable device is used to air-write or make gestures. The use of full motion information such as rate of change of motion or tilt angle to perform functions and commands is also disclosed. In addition, the use of air-writing to input search criteria and filter schemes for portable devices to manage, search, and sort through various data, files, and information is disclosed.