Stationary Cylindrical Touch Control Knob for Portable Radios

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Solution Overview

Problem

Portable and mobile radios face reliability issues with mechanical switches for volume and channel control, which can be damaged by repeated use and drops, and occupy space, leading to user interface challenges such as insufficient torque, inadvertent activation, and alignment requirements.

Innovation Solution

A 3D cylindrical touch control with a capacitive sensitive touch panel providing 360-degree interaction, offering virtual rotating, swiping, and tapping capabilities, along with visual, audio, and haptic feedback, to enhance user interface efficiency and reduce mechanical switch reliance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical switches are used for volume and channel control, then the device can provide tactile feedback and precise control, but the reliability deteriorates after repeated use and drops

Engineering Contradiction:

Improveswitch reliabilityVSAvoidtorque requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces mechanical switches with a capacitive touch-sensitive display that detects user input through electrical capacitance changes rather than mechanical contact. This eliminates wear from repeated use and damage from drops while maintaining control functionality through touch gestures on the display surface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the control mechanism from mechanical displacement to electrical parameter detection (capacitance). The touch-sensitive display measures changes in electrical capacitance when a user touches or hovers near the display, converting physical interaction into electrical signals for volume and channel control without mechanical moving parts.

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If mechanical switches and knobs are used for volume and channel control, then the device provides direct tactile interaction, but the control area space is compromised

Engineering Contradiction:

Improvecontrol area spaceVSAvoidtactile interaction quality

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The patent merges the display function with the control function by making the display itself touch-sensitive. This integration allows the display to serve dual purposes: showing information and receiving user input for volume and channel control, thereby maximizing the use of available control area space.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch-sensitive display serves multiple functions: it displays visual information, detects touch gestures for volume control, detects gestures for channel control, and provides tactile feedback through the interface. This multi-functionality eliminates the need for separate mechanical controls while maintaining ease of operation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If mechanical knobs are used for volume control, then the device provides rotational adjustment capability, but the alignment requirement compromises user interaction speed

Engineering Contradiction:

Improveinteraction speedVSAvoidmarker alignment precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces mechanical rotational knobs with a touch-sensitive display that detects the position and movement of a user's finger across the display surface. This eliminates the need for precise alignment with markers while maintaining rotational adjustment capability through finger dragging gestures, significantly improving interaction speed.

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

The solution provides a reliable, space-efficient, and intuitive user interface that minimizes accidental activations and aligns feedback mechanisms, enhancing user interaction and device durability.

Implementation Method 1

The flexible touch panel sensor senses a user interaction with the fixed surface and generates an interface signal in response thereto

Methodology Applied

Scientific EffectCapacitive sensing: Capacitance

Data Source

PatentUS9766705B2Stationary interface control and method for using the same

Publication Date: 2017.09.19 MOTOROLA SOLUTIONS INC

AI summary

A stationary interface control knob includes a body having a fixed substantially-cylindrical surface with a first axis, and a flexible touch panel sensor having a sensor surface at least partially in cylindrical form with a spaced relationship from the fixed substantially-cylindrical surface. The sensor surface has a second axis coinciding with the first axis. The flexible touch panel sensor senses a user interaction with the fixed substantially-cylindrical surface and generates an interface signal in response thereto. Also discloses are method of controlling the stationary interface control knob.