Control knob for a household appliance
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Solution Overview
Problem
Users of household appliances, particularly kitchen appliances, face difficulties in setting operation programs and parameters due to unfamiliarity with the appliance's interface, leading to discomfort and potential erroneous inputs.
Innovation Solution
A control knob with a fixed electronics unit and rotatable knob part, featuring light guides that selectively illuminate symbol areas on the knob's surface, allowing users to intuitively select settings through angular position sensing, enhancing user interaction and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a control knob with multiple symbol areas is provided for selecting operation programs and parameters, then the functionality and versatility of the appliance is improved, but the complexity of the user interface increases making it harder for users to understand and operate
Solution Approach 1:
The patent applies local quality by selectively illuminating only specific symbol areas on the control knob at any given time. Instead of having all symbols visible and static, the system dynamically changes the illumination state of different symbol areas based on the current operational context, making only relevant options visible to the user. This resolves the contradiction by maintaining high functionality (multiple symbols are available) while reducing perceived complexity (only relevant symbols are visible at once).
Solution Approach 2:
The control knob system transitions from a static interface to a dynamic one where symbol illumination changes based on operational state. The control unit activates or deactivates light guides corresponding to different symbol areas depending on the current operation program or parameter setting context. This dynamic adaptation allows the interface to present only necessary information at each moment, reducing cognitive load while maintaining comprehensive functionality across different operating modes.
2Ease of operation
If light guides are used to illuminate symbol areas on the control knob, then user guidance and interface clarity is improved, but the device complexity and manufacturing cost increases
Solution Approach 1:
The patent implements the nesting principle by integrating light guides within the structure of the control knob itself. The light guides are embedded in the knob housing or behind the symbol areas, creating a compact nested arrangement where the illumination system is contained within the existing control knob geometry. This approach provides effective user guidance through selective illumination while minimizing additional external components and maintaining a clean, integrated appearance.
Solution Approach 2:
The light guides serve as an intermediary element between the control unit's electronic signals and the visual presentation to the user. Rather than having complex display screens or multiple indicators, the system uses light guides as a simple optical mediator that translates electronic control states into intuitive visual feedback. This intermediary approach simplifies the overall system architecture while effectively guiding user interaction through selective symbol illumination.
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 robust and user-friendly interface by ensuring only relevant symbol areas are illuminated, guiding users through operation programs and parameters, thereby increasing the appliance's comfort-of-use and reducing errors.
Implementation Method 1
The control knob comprises at least one light guide (which may be made up of a light-guiding material, such as glass or plastic) which is configured to guide light from a first end of the light guide, which is facing the light element
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
A control knob (110) for a household appliance (100) is described, wherein the control knob (110) comprises a knob housing (210) configured to be attached to the housing wall of the appliance (100), and an electronics unit (220) comprising at least one light element (221) which is configured to emit light. Furthermore, the control knob (110) comprises a rotatable knob part (250) rotatably attached to the knob housing (210), wherein the rotatable knob part (250) comprises a, in particular cylindrical, wall with at least one transparent and/or translucent symbol area (252). The control knob (110) further comprises at least one light guide (211) configured to guide light from a first end of the light guide (211), which is facing the light element (221), to a second end of the light guide (211), which is facing the inner surface of the wall of the rotatable knob part (250), such that light from the light element (221) passes through the symbol area (252) within the wall of the rotatable knob part (250), if the symbol area (252) is aligned with the second end of the light guide (211), and such that light from the light element (221) is blocked by the wall of the rotatable knob part (250), if the symbol area (252) is not aligned with the second end of the light guide (211).