In-Vehicle Lever Switch Dual Knob Rotation Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-vehicle lever switch devices with two rotating knobs near the end of a cylindrical lever body face challenges in size increase, structural complexity, and increased component count due to the need for separate rotation detecting mechanisms, which complicates assembly and increases costs.
Innovation Solution
A cylindrical lever switch device with a combined pair of halved lever bodies and a single holder supports both rotating knobs, with a circuit board mounted between them, allowing both knobs to be detected on one circuit board, reducing size and component count, and improving assemblability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two separate circuit boards are used to detect rotation of two rotating knobs, then rotation detection accuracy is improved, but device size increases
Solution Approach 1:
Two separate circuit boards for detecting rotation of two rotating knobs are merged into a single circuit board. The circuit board is positioned between the two rotating knobs and includes both rotation detection portions, eliminating the need for separate boards and reducing overall device size while maintaining detection accuracy.
2Reliability
If two separate circuit boards are used for rotation detection, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines two separate circuit boards into one unified circuit board that contains both rotation detection portions. This merging reduces structural complexity by eliminating the need for separate mounting, wiring, and assembly processes for two distinct boards, while the circuit board itself maintains reliable detection capabilities for both rotating knobs.
3Volume of moving object
If one large circuit board is used to detect both rotating knobs, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The circuit board is divided into two distinct rotation detection portions, each independently configured to detect one rotating knob. This segmentation allows each detection portion to be optimized for its specific function, reducing the overall precision requirements compared to a single large-scale integration while maintaining compact device size.
4Measurement precision
If two separate circuit boards are used, then detection accuracy is improved, but assembly difficulty increases
Solution Approach 1:
The patent merges two separate circuit boards into one single circuit board that performs both rotation detection functions. This consolidation simplifies the assembly process by reducing the number of components to be mounted, wired, and aligned, while the circuit board is strategically positioned between the two rotating knobs to maintain accurate detection of both knobs' rotations.
Data Source
AI summary
In a lever switch device, a holder is assembled in and fixed to a cylindrical lever body formed by combining halved lever bodies and the holder supports two rotating knobs so as to allow the rotating knobs to rotate. Further, a circuit board is mounted on the holder, and both main surfaces of the circuit board face the rotating knobs, respectively. The rotating knob is exposed to the outside at the end of the cylindrical lever body in the axial direction, and the rotating knob is exposed to the outside through window portions formed at the cylindrical lever body. Sliders are mounted on the rotating knobs, respectively, one slider can come into contact with and be separated from contact patterns formed on the main surface, and the other slider can come into contact with and be separated from contact patterns formed on the main surface.