Pump Position Feedback Dispenser for Viscous Liquid Coating
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Solution Overview
Problem
Existing dispensers used in semiconductor and LED chip coating processes face challenges in maintaining accurate position and angle of viscous liquid application due to variations in work position and angle, leading to degraded coating precision.
Innovation Solution
A pump position feedback type dispenser system that includes a camera for capturing images of works, linear encoders for real-time position determination, and a control unit to generate pump operation signals, ensuring accurate and quick dispensing of viscous liquid by adjusting the pump's position and path accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dispenser operates along a preset path, then the dispensing process is simple and fast, but the position accuracy of the viscous liquid on the work degrades when the work position and angle vary
Solution Approach 1:
The system employs linear encoders to provide real-time feedback on the pump's actual position during movement. This feedback mechanism allows the control unit to continuously monitor and adjust the pump position, ensuring accurate liquid deposition even when workpiece positions vary, thus resolving the contradiction between high-speed preset path operation and position accuracy
Solution Approach 2:
The system dynamically adjusts the pump position based on real-time feedback from linear encoders and camera-based workpiece position detection. Instead of relying solely on a static preset path, the system adapts the dispensing trajectory in real-time to compensate for workpiece position variations, maintaining accuracy while preserving productivity
2Ease of operation
If the work position and angle vary from preset values, then the dispensing process remains simple, but the position accuracy of the coated viscous liquid degrades
Solution Approach 1:
The system performs preliminary detection of workpiece position and angle using a camera before the dispensing process begins. Based on this detected information, the control unit pre-calculates and determines the accurate pump operation positions and path, allowing the system to compensate for workpiece variations without complicating the actual dispensing operation
Solution Approach 2:
The system uses camera-based vision feedback to detect workpiece position and angle variations, and linear encoder feedback to monitor pump position. This dual feedback mechanism enables real-time compensation for workpiece variations, maintaining coating accuracy while keeping the operation process simple through automated adjustment
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
Enables accurate and rapid coating of viscous liquid on multiple works by continuously monitoring and adjusting the pump's position in real-time, enhancing precision and productivity by ensuring the viscous liquid is applied at the correct position and angle.
Implementation Method 1
linear encoders mounted in the pump moving portion so as to generate a pump position signal by determining a position of the pump in real time
Implementation Method 2
a camera configured to capture images of the plurality of works to determine positions of the plurality of works disposed below the pump
Implementation Method 3
The updown unit 140 includes piezoelectric actuators 142 and 143 and a lever 141
Data Source
AI summary
Provided are a pump position feedback type dispenser and dispensing method, in which an image of a work, to which a viscous liquid is to be dispensed, is captured to determine an accurate position and direction of the work, and then a position of a pump is received in real time so as to dispense the viscous liquid to the work while ensuring that the pump reaches the accurate position of the work.