Liquid Ejecting Head Unit Grounding and Positioning
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Solution Overview
Problem
Ink jet type recording head units experience unstable grounding and positional shifts due to deformation of folded portions and external forces during mounting and operation, leading to grounding faults and ink deposition errors.
Innovation Solution
A liquid ejecting head unit design featuring a conductive holder that electrically connects the fixing plate to the support body, eliminating the need for external grounding members and reducing positional shifts by using a holder with convex portions for adhesion and a reinforcement plate for structural integrity, along with a liquid repelling film configuration to prevent deformation and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grounding is performed via a folded portion that contacts the carriage, then grounding connection is established, but conduction becomes unstable due to deformation and attachment of ink
Solution Approach 1:
The invention extracts the grounding function from the folded portion structure and relocates it to a dedicated grounding member that contacts the fixing plate. This separates the grounding function from the mechanical support function, allowing stable electrical connection without relying on the folded portion's structural integrity.
Solution Approach 2:
The invention introduces a dedicated grounding member as an intermediary between the carriage and the fixing plate. This grounding member provides a reliable electrical connection path without requiring the folded portion to maintain precise contact, thus resolving the instability caused by deformation.
2Reliability
If a folded portion is used for grounding, then electrical connection is achieved, but external forces cause positional shifts of the ink jet type recording head unit
Solution Approach 1:
The invention extracts the grounding function from the mechanical support structure (folded portion) and assigns it to a dedicated grounding member. This allows the mechanical structure to focus on support without generating external forces that would cause positioning shifts.
Solution Approach 2:
The invention segments the functions by separating the grounding function from the mechanical support function. The grounding member handles electrical connection while the holder structure handles mechanical support, preventing interference between these functions that would cause positioning errors.
3Reliability
If a folded portion contacts the carriage for grounding, then electrical connection is established, but repeated attachment and detachment cause grounding faults
Solution Approach 1:
The invention extracts the grounding function from the folded portion and assigns it to a dedicated grounding member with a contact structure designed for repeated attachment and detachment. This dedicated grounding member maintains stable electrical connection over time without the degradation issues affecting the folded portion.
4Device complexity
If ink attaches to the folded portion and carriage contact area, then grounding path is blocked, but the folded portion structure remains simple
Solution Approach 1:
The invention extracts the grounding function from the folded portion and relocates it to a dedicated grounding member. This allows the grounding contact area to be specifically designed and positioned away from ink ejection areas, preventing ink contamination while maintaining structural simplicity.
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
The solution ensures reliable grounding and prevents positional shifts and grounding faults, reducing the risk of electrical connection issues and ink deposition errors, while also protecting the driving portions and dissipating heat effectively.
Implementation Method 1
the holder has a conductive property that electrically connects the support body and the fixing plate to one another
Implementation Method 2
a liquid repelling film is formed
Data Source
AI summary
A liquid ejecting head unit that ejects a liquid from a nozzle, the liquid ejecting head unit including a driving portion that includes an ejection surface on which a plurality of nozzles that eject the liquid are formed; a fixing plate to which a plurality of the driving portions are fixed, and a holder that (Condition 1) is fixed to a support body, which supports the liquid ejecting head unit, and the holder has a conductive property that electrically connects the support body and the fixing plate to one another, or that (Condition 2) includes a portion that projects from the fixing plate in a direction orthogonal to the ejection surface, and houses the plurality of driving portions.