Inkjet Head Chip Upstream Opening Edge Positioning
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Solution Overview
Problem
Existing inkjet head chips face challenges in smoothly circulating ink between pressure chambers and circulation paths, leading to issues like ink retention and protective film degradation.
Innovation Solution
The design incorporates a head chip with jet channels, jet holes, communication channels, and a flow channel plate, where the upstream opening edge is positioned outside the channel opening edge to prevent ink retention, and the communication channels are configured to ensure smooth ink flow and prevent flaring, enhancing durability by preventing protective film degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upstream opening edge is positioned inside or aligned with the channel opening edge, then the structure is simpler and easier to manufacture, but ink retention occurs between the opening edges causing protective film degradation
Solution Approach 1:
The patent inverts the conventional positioning relationship by placing the upstream opening edge outside the channel opening edge rather than inside or aligned with it. This inversion prevents the formation of flared parts at the inner side of the channel opening edge, eliminating ink retention zones and protecting the protective film from degradation.
2Reliability
If the communication channels are configured with proper opening edge positioning, then ink circulation becomes smooth and protective films are protected, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by specifically positioning the upstream opening edge outside the channel opening edge at the critical interface region. This localized structural adjustment ensures smooth ink circulation and prevents protective film degradation at the most vulnerable location without requiring high precision throughout the entire device.
3Reliability
If the return plate is bonded with proper positioning of opening edges, then ink retention is prevented and protective films are preserved, but the bonding process becomes more complex
Solution Approach 1:
The patent implements preliminary action by pre-positioning the upstream opening edge outside the channel opening edge before the bonding process. This preliminary structural arrangement ensures that even with bonding variations, the opening edges maintain proper relative positioning, preventing ink retention and protective film degradation without requiring complex bonding control.
Data Source
AI summary
There are provided a head chip, a liquid jet head, and a liquid jet recording device which smoothly circulates ink between pressure chambers and a circulation channel to thereby prevent disappearance of a protective film to improve durability. The head chip according to an aspect of the present disclosure includes an ejection section, a jet hole plate, a return plate, a flow channel plate, and a protective film. A communication channel includes an upstream opening communicated with a channel opening which opens toward a first side in a first direction in a jet channel, a downstream opening communicated with a manifold opening which opens toward the first side in the first direction in the manifold, and a connecting part which extends in a third direction, and which is configured to connect the upstream opening and the downstream opening to each other. The return plate is bonded to the ejection section so that at least a part of an opening edge in the upstream opening is arranged at an outer side when viewed from the first direction with respect to an opening edge of the channel opening.