Rotary Knob Controller With Continuous Sealing Layer

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Solution Overview

Problem

Conventional controllers with rotary knobs lack effective environmental sealing, which allows contaminants like dust and liquids to enter the internal components, compromising their reliability and functionality, especially in harsh environments such as vehicles and industrial equipment.

Innovation Solution

A controller design featuring a continuous sealing layer connected to the base, forming an environmentally sealed compartment that houses a circuit board and a ring-shaped rotary knob encoder. The sealing layer includes a pedestal support with semi-cylindrical accommodations and cylindrical pins, and the rotary knob encoder has magnets and detents that interact with Hall switches to detect rotation, enabling precise control signal generation for direction and distance of rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional rotary knob design is used, then the controller structure is simple, but environmental sealing is insufficient allowing contaminants to enter internal components

Engineering Contradiction:

Improveenvironmental sealingVSAvoidcontroller structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a continuous sealing layer (thin film) that extends across the entire controller surface, including over the rotary knob encoder. This sealing layer prevents contaminants from penetrating into the internal compartment while maintaining a relatively simple overall structure. The sealing layer is integrated with the base and side walls to form a complete protective barrier.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The rotary knob encoder is positioned within a sealed compartment formed by the base and continuous sealing layer. The encoder is nested within the protected internal environment, allowing it to detect rotational input through the sealing layer without direct exposure to external contaminants. This nesting approach protects internal components while maintaining functional access.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Object-affected harmful factors

If a continuous sealing layer is implemented, then environmental protection is improved, but the complexity of the sealing structure increases

Engineering Contradiction:

Improvecontaminant protectionVSAvoidsealing structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The continuous sealing layer serves multiple functions simultaneously: it provides environmental sealing against contaminants, supports the rotary knob encoder positioning, and allows detection of rotational input through its structure. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall structural complexity despite the comprehensive sealing protection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If the rotary knob encoder is positioned on the sealing layer, then detection capability is maintained, but the sealing integrity may be compromised

Engineering Contradiction:

Improverotation detectionVSAvoidsealing integrity

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces direct mechanical contact between the rotary knob encoder and internal components with a magnetic field-based detection system. Magnets are positioned on the encoder, and Hall switches inside the sealed compartment detect the magnetic field changes as the encoder rotates. This substitution allows precise rotation detection through the sealing layer without creating mechanical openings that would compromise sealing integrity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The sealing layer acts as an intermediary between the external rotary knob encoder and the internal detection system. It physically separates the encoder from the Hall switches while allowing magnetic field penetration for detection purposes. This intermediary approach maintains both sealing integrity and detection functionality simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 improved environmental sealing, preventing contaminants from entering the compartment and ensuring reliable operation by using a continuous sealing layer and Hall switch detection system, while allowing precise control signals for rotational inputs, enhancing the controller's durability and functionality.

Implementation Method 1

The at least two Hall switches are configured to change states when in proximity to the magnets as the rotary knob encoder rotates to detect rotation of the rotary knob encoder

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentEP3392732B1Rotary knob controller

Publication Date: 2022.09.21 DANFOSS POWER SOLUTIONS INC

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AI summary

According to the present disclosure, a controller includes a base and a continuous sealing layer connected to the base forming an environmentally sealed compartment between the base and a lower surface of the continuous sealing layer. A circuit board is positioned within the compartment, and a rotary knob encoder is positioned on an upper surface of the continuous sealing layer. Movement of the rotary knob encoder is detectable by the circuit board through the continuous sealing layer.