Droplet Ejector Array with Stationary Printhead and Movable Target
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Solution Overview
Problem
Existing droplet ejection systems require complex scanning mechanisms and control systems to position printheads accurately, which increases complexity and costs, especially in applications where multiple target media are involved or when a disposable device is needed.
Innovation Solution
An array of droplet ejectors is positioned such that some eject droplets directly onto a target medium while others miss it, allowing for flexible fluid delivery to various target media without the need for a scanning mechanism or control system, using a disposable cartridge design with a frame to hold the target medium immovable relative to the droplet ejectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a scanning mechanism and control system are used to position printheads accurately, then droplet ejection precision is improved, but device complexity increases
Solution Approach 1:
The device is segmented into a stationary printhead array and movable target media. Instead of moving the printhead to position droplets, the target media is moved to bring different regions into alignment with the fixed printhead array, thereby achieving precise droplet placement without complex scanning mechanisms
Solution Approach 2:
The conventional approach is inverted: rather than moving the droplet source (printhead) to reach different target locations, the target media is moved to reach the stationary droplet source. This inversion eliminates the need for complex printhead positioning while maintaining precision
2Adaptability or versatility
If a scanning mechanism is used to move the printhead across multiple target media, then versatility is improved, but device complexity increases
Solution Approach 1:
The stationary printhead array is designed to serve multiple target media simultaneously or sequentially by simply moving the target media into position. This multi-functional design allows a single printhead array to process multiple different targets without requiring complex scanning or repositioning mechanisms
Solution Approach 2:
The system allows the target media to be moved into the appropriate position to receive droplets from the stationary printhead array, eliminating the need for an active scanning mechanism. The simplicity of moving targets rather than the printhead reduces mechanical complexity while maintaining versatility
3Ease of operation
If a disposable cartridge design is used, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The printhead array and target media are pre-positioned relative to each other in the disposable cartridge during manufacturing. This preliminary positioning ensures that when the cartridge is used, the droplets will be deposited at the correct locations without requiring additional precision adjustments during operation
Solution Approach 2:
The cartridge is designed as a disposable component that can be manufactured with integrated printhead and target media positioning. By accepting the cartridge as a single-use item, higher precision can be achieved during manufacturing without the need for complex, expensive, and reusable precision mechanisms
Data Source
AI summary
An example device includes a first substrate including a first array of droplet ejectors to eject droplets of a first fluid. The example device further includes a first target medium immovably positioned relative to the first substrate to receive droplets of the first fluid from a first subset of droplet ejectors of the first array of droplet ejectors. A second subset of droplet ejectors of the first array of droplet ejectors is positioned to eject droplets of the first fluid to miss the first target medium.