Knob Structure Magnetic Tactile Feedback Assembly
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Solution Overview
Problem
Existing knob structures in portable electronic devices face issues with dimensional errors during assembly, leading to operational inconvenience and increased production costs, and lack light indication for low-light environments.
Innovation Solution
A knob structure comprising a rotary encoder, light emitting sources, a light guiding ring, a brake wheel, and a rotary wheel, which allows for non-fixed engagement and smooth rotation, reducing assembly errors and providing light indication through diffused LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical rotary component with flange is used to provide tactile feedback, then the user can feel physical tactility during operation, but dimensional errors during assembly cause the rotary wheel and through-hole to interfere with each other, leading to operational inconvenience and increased production costs
Solution Approach 1:
The patent replaces the static mechanical flange engagement with a dynamic magnetic field interaction. The brake wheel with magnetic particles interacts with the rotary encoder through magnetic attraction, allowing for dynamic adjustment and compensation of dimensional variations during assembly, thereby eliminating interference issues while maintaining tactile feedback.
Solution Approach 2:
The patent substitutes the purely mechanical flange-based tactile feedback system with a hybrid system combining magnetic fields and mechanical elements. The magnetic particles in the brake wheel create magnetic resistance that provides tactile feedback, replacing the need for precise mechanical flange engagement and reducing sensitivity to dimensional errors.
2Volume of moving object
If an electronic touch knob is used to reduce device volume, then the device becomes more compact, but the user lacks physical touch feeling when operating the knob
Solution Approach 1:
The patent merges the advantages of both mechanical and electronic knob systems by integrating a compact rotary encoder with a brake wheel that provides mechanical tactile feedback. This combination maintains the small form factor of electronic components while adding the physical touch feeling characteristic of mechanical knobs through magnetic particle interaction.
3Stability of the object's composition
If the rotary component and rotary wheel are assembled on the circuit board with fixed engagement, then the structure is stable, but dimensional errors cause interference between components, reducing product yield
Solution Approach 1:
The patent changes the engagement parameter from fixed mechanical contact to magnetic field interaction with controlled magnetic attraction force. This parameter change allows the system to accommodate dimensional variations within a wider tolerance range, reducing the rate of defective products while maintaining structural stability through magnetic braking.
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
Enhances product yield and reduces production costs by minimizing assembly errors and enabling convenient operation in low-light conditions through smooth rotation and integrated lighting.
Implementation Method 1
a brake wheel (12) containing a plurality of magnetic particles
Implementation Method 2
a plurality of light emitting sources (14)
Data Source
AI summary
A knob structure is disposed on an electronic device to input a preset control signal. The knob structure includes a rotary encoder, a brake wheel, and a rotary wheel. A plurality of ratchets is disposed around the circumference of the brake wheel and locked on the rotary encoder. The rotary wheel is rotatably disposed on the body case of the electronic device and is nested on the brake wheel correspondingly. A block is disposed on the rotary wheel to be embedded between the ratchets, so as to control the rotation of the rotary wheel to generate a preset control signal by causing the brake wheel to drive the rotary encoder to rotate. The rotary wheel and the brake wheel are engaged non-fixedly, so as to prevent the rotary wheel and the body case of the electronic device from interfering with each other.