Inkjet Print Head Restrictor Design for Cross-Talk Dampening
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Solution Overview
Problem
Existing inkjet print heads face challenges in achieving a space-efficient design with effective cross-talk filtering and improved performance and/or lifetime.
Innovation Solution
The inkjet print head incorporates a restrictor layer with inlet and outlet restrictors of different cross-sections, where the inlet restrictor acts as a particle filter and cross-talk damper, and the outlet restrictor allows for higher throughput and particle removal, thereby reducing contamination and improving droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equal cross-section restrictors are used for both inlet and outlet, then the design is simple and symmetric, but particle filtration and cross-talk prevention are insufficient
Solution Approach 1:
The patent applies local quality by giving the inlet restrictor a smaller cross-sectional area than the outlet restrictor. The inlet restrictor is specifically designed with reduced dimensions to serve as a particle filter and cross-talk damper, while the outlet restrictor maintains a larger cross-section to ensure adequate flow throughput. This localized differentiation in restrictor geometry enables specialized functions at different locations within the pressure chamber system.
2Reliability
If a small restrictor cross-section is used, then particle filtration and cross-talk damping are improved, but ink throughput is reduced
Solution Approach 1:
The patent segments the restrictor function into two distinct components: an inlet restrictor with smaller cross-section dedicated to particle filtration and cross-talk damping, and an outlet restrictor with larger cross-section dedicated to maintaining high ink throughput. This segmentation allows each restrictor to be optimized for its specific function without compromising the other, as the outlet restrictor's larger size ensures adequate flow while the inlet restrictor's smaller size provides filtering and damping.
3Reliability
If additional cross-talk dampers are added to the design, then cross-talk filtering is improved, but the footprint and device complexity increase
Solution Approach 1:
The patent makes the inlet restrictor multi-functional by designing it to simultaneously perform three functions: (1) control ink flow into the pressure chamber, (2) filter particles from the ink, and (3) dampen pressure waves to prevent cross-talk between adjacent nozzles. By consolidating these functions into a single component with optimized geometry, the design achieves effective cross-talk filtering without adding separate dampers that would increase footprint and complexity.
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 enhances the performance and lifetime of the droplet jetting device by reducing particle contamination and preventing cross-talk between pressure chambers, while also achieving a compact footprint for high nozzle density.
Implementation Method 1
The cross-section of the inlet restrictor may be smaller than that of the outlet restrictor... which allows one of the restrictors to have the additional functionality of acting as a particle filter
Implementation Method 2
Said inlet and outlet restrictors however form passages which allow pressure waves generated in one pressure chamber to travel to an adjacent pressure chamber... acting as a particle filter and/or cross-talk filter
Data Source
Figure 1
Figure 2~3
AI summary
A method of forming a high performance, space efficient inkjet print head, comprising the steps of: - forming a restrictor layer comprising actuator chamber recesses and passages for inlet and restrictors, wherein a cross-section of the inlet restrictor passages is smaller than that of the outlet restrictor passages, and wherein between neighboring actuator chamber recesses either a pair of adjacent inlet passages or a pair of outlet passages is provided in an alternating manner; - attaching a membrane layer to the restrictor layer, such that an actuator is sealed in each actuator chamber recess; - attaching a nozzle layer to the membrane layer to form pressure chambers in fluid connection with a respective inlet passage, outlet passage, and a nozzle; - forming a distribution layer by bonding wafers to opposite sides of a flexible film, wherein the distribution layer comprises supply lines, return lines, and damper elements formed by recesses formed in the first distribution wafer and sealed by the damper membrane film; - attaching the distribution layer to the restrictor layer, such that a damper element is positioned over each pair of neighboring outlet restrictors.