Liquid Ejecting Head Sealing Layout to Protect Chip Reliability
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Solution Overview
Problem
The reliability of liquid ejecting heads is compromised due to the reaction force of the elastic seal member interposed between the head module and the supply channel member, leading to potential deformation and reduced performance.
Innovation Solution
The seal member is positioned such that its seal area does not overlap the chip, thereby minimizing the reaction force on the chip and maintaining the reliability of the head module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic seal member is interposed between the head module and supply channel member to form a liquid-tight connection, then sealing performance is improved, but the reaction force of the elastic member causes deformation of the head module and reduces reliability
Solution Approach 1:
The invention divides the sealing area into two distinct regions: a first seal area that overlaps the chip and a second seal area that does not overlap the chip. This segmentation allows the sealing function to be distributed, with the second seal area bearing the reaction force while the first seal area maintains sealing without承受ing deformation loads, thus resolving the contradiction between sealing performance and structural integrity
Solution Approach 2:
The invention applies different functional qualities to different regions of the seal member. The first seal area is positioned to provide liquid-tight sealing where it is most needed (overlapping the chip), while the second seal area is positioned to absorb reaction forces (not overlapping the chip). This local differentiation of sealing function and force-bearing function resolves the contradiction by ensuring that sealing and structural protection occur at different locations
2Reliability
If the seal area of the seal member overlaps the chip, then sealing performance is improved, but the reaction force causes deformation and reduces reliability
Solution Approach 1:
The sealing area is segmented into two functional zones: the first seal area that overlaps the chip for primary sealing, and the second seal area that does not overlap the chip for force distribution. This segmentation prevents concentration of reaction forces on the chip, thereby maintaining manufacturing precision and alignment while achieving reliable sealing
Solution Approach 2:
The second seal area acts as an intermediary structure between the elastic seal member and the head module. It provides an additional sealing interface that does not directly contact the chip, thereby mediating the transmission of reaction forces and preventing them from causing deformation or misalignment of the chip while still maintaining liquid-tight connection
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 configuration enhances the reliability of the head module by reducing the likelihood of deformation and maintaining sealing performance, ensuring consistent ink ejection.
Implementation Method 1
an elastic member (seal member) interposed in between
Data Source
AI summary
A liquid ejecting head includes a head module configured to eject a liquid in a first direction, a supply channel member, and an elastic seal member that is arranged between the head module and the supply channel member in the first direction, thereby liquid-tightly connecting a first channel orifice of the first head module and a channel orifice of the supply channel member. The head module includes a channel orifice forming member in which the first channel orifice is formed, and a chip that is arranged in the first direction relative to the channel orifice forming member. A seal area of the seal member held between the channel orifice forming member and the supply channel member does not overlap the chip as viewed in the first direction.