Switch Apparatus Merging Fixed Contacts to Reduce Wiring Complexity
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Solution Overview
Problem
The complexity of wiring patterns on circuit boards in power window opening and closing switch apparatuses with five fixed contacts increases manufacturing costs and limits circuit design freedom due to dense and complex layouts.
Innovation Solution
A switch apparatus with a reduced number of fixed contacts, utilizing a slider with movable contacts that bring the auto, down, up, and common fixed contacts into contact to generate four types of command signals, simplifying the wiring layout and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If five fixed contacts are used to enable manual down/up and auto down/up operations, then the switch apparatus can reliably output four types of command signals, but the wiring patterns become complex and dense, increasing manufacturing costs and limiting circuit design freedom
Solution Approach 1:
The patent combines the common fixed contact with the auto fixed contact by positioning them adjacently and electrically connecting them through a conductive structure. This merging reduces the effective number of separate fixed contacts from five to four, simplifying the wiring layout while maintaining the ability to generate all four command signals (manual down, manual up, auto down, auto up) through strategic placement of movable contacts on the slider.
2Adaptability or versatility
If five fixed contacts are disposed on the circuit board, then all necessary contact functions are achieved, but the circuit board layout becomes dense and space-consuming, increasing the overall apparatus size
Solution Approach 1:
The patent merges the common fixed contact and auto fixed contact into an integrated structure, reducing the total number of fixed contacts from five to four. This consolidation decreases the area required on the circuit board while preserving all necessary contact functions through the strategic use of movable contacts that can engage with the merged structure to generate all four command signals.
Solution Approach 2:
The merged common/auto fixed contact structure serves multiple functions: it acts as a common reference point for both manual and auto operations, and as an auto operation contact. The movable contacts on the slider are designed to engage with this merged structure in different positions to generate multiple command signals, achieving multi-functionality with reduced component count and smaller board area.
Data Source
AI summary
A switch apparatus includes first, second, third, and fourth movable contacts held by a slider and sliding on a circuit board in conjunction with the rotational operation of an operation knob, and a belt-like common fixed contact, an auto fixed contact, a down fixed contact, and an up fixed contact provided on the circuit board. The auto fixed contact, down fixed contact, and up fixed contact are distributed on a straight line parallel to the common fixed contact. The third and fourth movable contacts are normally in sliding contact with the common fixed contact.