Rotary Knob Switch Layout for Thinner Electronic Housings
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Solution Overview
Problem
Existing electronic housings are thick due to the stacking of components like printed circuit boards, rotary switches, and knobs, necessitating a thinner design.
Innovation Solution
An electronic housing with a rotary knob and lever-operated detection switch where the lever movement is controlled by the knob, with the switch positioned offset relative to the knob, and a transmission system that transforms knob rotation into lever movement, allowing for a reduced height by positioning the switch below the edge of the printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rotary switch, printed circuit, and wheel are superimposed along the axis, then the rotational control function is achieved, but the thickness of the electronic box increases
Solution Approach 1:
The patent repositions the toothed plate from a location beyond the printed circuit to a location on the printed circuit itself. This spatial reconfiguration changes the dimensional arrangement of components, allowing the toothed plate to be integrated within the existing footprint of the printed circuit rather than extending beyond it, thereby reducing the overall thickness of the electronic box while maintaining the rotational control function.
Solution Approach 2:
The patent merges the toothed plate with the printed circuit by positioning it on the printed circuit surface. This consolidation combines two separate components into a more integrated arrangement, eliminating the need for additional space beyond the printed circuit and reducing the overall thickness of the device.
2Reliability
If the toothed plate is positioned beyond the printed circuit edge, then the wheel rotation mechanism functions properly, but the thickness of the electronic box increases
Solution Approach 1:
The patent relocates the toothed plate from a position beyond the printed circuit edge to a position on the printed circuit surface. This dimensional change allows the wheel rotation mechanism to function properly while keeping all components within the existing thickness envelope of the printed circuit, thereby reducing the overall thickness of the electronic box.
Solution Approach 2:
The printed circuit serves multiple functions: it provides electrical connections and also serves as the mounting surface for the toothed plate. This multi-functional use of the printed circuit eliminates the need for additional space beyond its edge, reducing thickness while maintaining the wheel rotation mechanism's reliability.
Data Source
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AI summary
The invention relates to an electronic housing comprising a rotatable wheel, a printed circuit board (108) having an edge (108a), a switch (110) with a body (110a) fixed to the printed circuit board (108), a lever (110b) rotatable on the body (110a) between two activation positions where the switch (110) is fixed so as to present its body (110a) on the printed circuit board (108) below the edge (108a) and its lever (110b) beyond the edge (108a), and a transmission system (112) comprising a hub (112a) integral with the wheel and a toothed plate (112b) integral with the hub (112a) and having first teeth (112c) that mesh successively with the lever (110b), and wherein the hub (112a) is disposed, relative to the printed circuit board (108), so that that the toothed plate (112b) is beyond the edge (108a).