Capacitive Controller Connection Layout for Compact Sealed Housings
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Solution Overview
Problem
Existing electronic control units with touch-sensitive capacitive operating elements face space constraints due to large connecting elements, material expense, and sealing issues, particularly in smaller housings.
Innovation Solution
The control unit employs thin, elastically designed connecting elements that run through retaining channels in the housing, allowing for reduced material usage and easy sealing, enabling conversion of mechanical switches to touch-sensitive elements without altering the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-volume connecting elements made of conductive plastic material are used, then reliable electrical connection is achieved, but space consumption increases and housing sealing becomes difficult
Solution Approach 1:
The patent employs thin, flexible conducting layers (film electrodes) instead of bulky three-dimensional connecting elements. These conducting films are deposited directly onto the circuit board surface, providing reliable electrical connection while occupying minimal space and enabling effective housing sealing.
Solution Approach 2:
The patent replaces traditional mechanical connecting elements (such as conductive plastic barrels or rivets) with a film-based electrical connection system. This substitution eliminates the need for thick mechanical structures while maintaining electrical conductivity and contact reliability.
2Area of stationary object
If multiple control elements are arranged in smaller housings, then device compactness is improved, but space for connecting elements becomes insufficient
Solution Approach 1:
The patent extracts the connecting element function from separate three-dimensional components and integrates it directly into the circuit board surface through deposited conducting films. This eliminates the need for additional space-consuming connecting elements and reduces assembly complexity.
Solution Approach 2:
The patent merges the functions of separate connecting elements with the circuit board trace structure itself. The conducting films are integrated into the PCB layout, combining the electrical connection function with the existing board structure and eliminating redundant components.
3Adaptability or versatility
If traditional mechanical switches are replaced by touch-sensitive elements, then modernization and functionality are improved, but housing conversion becomes complex
Solution Approach 1:
The patent uses thin conducting films as touch-sensitive elements that can be applied to the inner surface of existing housing or cover plates. This allows conversion of traditional mechanical switch housings to touch-sensitive interfaces without modifying the housing structure itself, maintaining ease of manufacture while upgrading functionality.
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
This design reduces material expenditure, facilitates easy sealing, and allows for seamless conversion of mechanical switches to touch-sensitive switches, improving space efficiency and sealing effectiveness.
Implementation Method 1
at least one touch-sensitive capacitive operating element which has an electrically conductive connecting element that clamps elastically between a contact surface of the printed circuit board and the cover plate
Implementation Method 2
touch-sensitive capacitive operating element
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The controller has a housing (10) provided with a printed circuit board (11), and a control unit comprising an electrically conductive connection unit (21) that is electrically clamped between a contact surface of the board and a cover plate (24), where the connection unit is made up of a plastic material e.g. silicone. The housing has a retaining channel (20) for supporting and positioning the connection unit, where the channel runs between the board and the plate. A set of retainers is provided at a side wall of the housing for an enclosure surface of the connection unit.