Pipetting Tip Slide Switch for ESD-Resistant Detection
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Solution Overview
Problem
Automated pipetting systems face challenges in detecting pipetting tips on robotic arms due to the vulnerability of existing switches to electrostatic discharge (ESD) and magnetic fields, with reed switches being prone to damage and microswitches experiencing premature wear and contact bounce, leading to reliability issues and increased maintenance costs.
Innovation Solution
A compact slide switch with a resilient, electrically conductive wiping member and a durable contact pad, designed to withstand millions of switching cycles, is used to detect the presence of pipetting tips without external power, resisting ESD and magnetic fields, and featuring a wiping action that minimizes mechanical resistance and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If reed switches are used for detecting pipetting tips, then the switch can withstand several million switching cycles, but the switch is vulnerable to electrostatic discharge and magnetic fields
Solution Approach 1:
The patent replaces the electromagnetic reed switch mechanism with a purely mechanical slide switch consisting of a sliding element and contact pads. This mechanical system is inherently immune to electrostatic discharge and magnetic fields while maintaining the required switching cycle durability through direct physical contact without electromagnetic components.
2Device complexity
If microswitches are used for detecting pipetting tips, then the switch structure is compact, but the switch action requires much force and has premature wear
Solution Approach 1:
The patent employs a sliding element that moves dynamically between contact pads along a defined path. The sliding action allows the switch to transition between states with minimal force requirement, and the continuous sliding contact design eliminates the snap-action wear problem, extending the switch life cycle while maintaining compact structure.
3Ease of operation
If slide switches with springs or snap-action are used, then the switch action is improved, but contact bounce and premature wear occur
Solution Approach 1:
The patent extracts and removes the spring and snap-action mechanisms from the slide switch design. By eliminating these components, the invention avoids the contact bounce and premature wear issues they cause, while still achieving reliable switch action through the direct sliding contact between the sliding element and contact pads.
4Ease of operation
If existing slide switches are used, then the switch provides improved switch action, but the mechanical resistance is too high and life cycle is too short
Solution Approach 1:
The patent optimizes the physical parameters of the sliding element and contact pads, including their dimensions, materials, and surface properties. These parameter changes reduce the mechanical resistance during sliding while increasing the durability of the contact surfaces, thereby extending the switch life cycle to several million cycles while maintaining smooth operation.
Data Source
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AI summary
A robotic arm (100) of an automated pipetting system comprising a pipetting tip adapter (90) and a slide switch (10) to detect the presence of pipetting tips (120) on said pipetting tip adapter (90), the slide switch comprising a first support member (21) and a second support member (22) configured to slide relative to one another between first and second positions along a movement axis (110), an electrically conducting contact pad (30) arranged on said first support member (21), and an electrically conducting terminal (40) physically attached to said second support member (22) in physical contact with said contact pad (30) when said support members (21,22) are in the first position, whereas said terminal (40) is a first resilient and inherently stable wiping member (41) expanding along said movement axis (110), and said first wiping member (41) is not in physical contact with said contact pad (30) when said support members (21,22) are in the second position, and an electric current can flow between said first wiping member (41) and said contact pad (30) when said support members (21,22) are in the first position, and said electric current between said wiping member (41) and said contact pad (30) is disrupted when said support members (21,22) are in the second position. Use of said robotic arm (100) in an automated pipetting system in which the slide switch (10) detects the presence of a pipetting tip (120) on a tip adapter (90), and an automated pipetting system comprising such a robotic arm (100) detecting the presence of a pipetting tip (120) on a tip adapter (90).