Annular Display Knob Layout for Compact Appliance Controls
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Solution Overview
Problem
Existing operator control devices for domestic appliances, combining electronic display panels and movable control elements, face challenges in achieving a compact design while ensuring user-friendly operability and intuitive information presentation, often resulting in large and clumsy components that require significant space.
Innovation Solution
The design incorporates an annular operator control element with an inwardly inclined upper face, embedded in the electronic display panel's cover, allowing for precise rotation and touchability, utilizing a sliding ring with low-friction materials and magnets for effortless movement, and a light-permeable cover for compactness and user-friendly interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional cylindrical control knobs are used, then they provide sufficient grip area for rotation, but they require large space and result in a bulky design
Solution Approach 1:
The control element is segmented into a flat annular front part and a cylindrical rear part. The annular front part provides the user interface surface for finger contact and rotation, while the cylindrical rear part provides structural support and mounting functionality. This segmentation allows the control element to maintain rotational operability with significantly reduced overall volume compared to a fully cylindrical design.
2Volume of moving object
If the control element is made compact, then space is saved, but it becomes difficult to rotate precisely with finger contact
Solution Approach 1:
The control element transitions from a purely cylindrical three-dimensional form to a flattened annular structure with reduced height dimension. The annular shape provides a larger diameter rotational path while maintaining a compact vertical profile. This dimensional change allows precise rotational control through finger contact on the annular surface while keeping the overall control element size compact.
3Ease of operation
If the upper face is made flat and raised, then precise finger contact and rotation are enabled, but the component height increases
Solution Approach 1:
Only the annular front part of the control element is raised with an inclined upper face to provide the necessary touchability and rotational guidance surface. The rest of the control element maintains a low profile. This localized raising provides the required operational interface while minimizing the overall projection height from the panel surface.
4Ease of operation
If the annular front part is made with low-friction materials, then effortless rotation is achieved, but manufacturing complexity increases
Solution Approach 1:
The control element uses composite construction with the annular front part made from low-friction materials such as PTFE (Teflon) or other lubricious polymers. This material selection reduces the coefficient of friction between the finger and control surface, enabling effortless rotation. The composite approach combines different materials with complementary properties to achieve both operational ease and structural integrity.
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
This solution enables a compact, user-friendly, and precise operator control device that saves space while allowing for easy setting of operating conditions, improving usability and reducing mechanical force required for rotation compared to conventional cylindrical controls.
Implementation Method 1
utilizing a sliding ring with low-friction materials and magnets for effortless movement
Implementation Method 2
utilizing a sliding ring with low-friction materials and magnets for effortless movement
Implementation Method 3
a light-permeable cover for compactness and user-friendly interaction
Data Source
AI summary
An operator control device for a domestic appliance includes an electronic display panel having a cover, and an operator control element which is movable relative to the display panel to set operating conditions of the domestic appliance. The operator control element is embedded, at least in part, in the cover of the electronic display panel, and includes an annular front part having an upper face which projects, at least in part, above a level of an outer face of the cover.