Liquid Ejecting Head Sealing via Adhesive Bonding
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Solution Overview
Problem
The existing liquid ejecting apparatuses, such as printers, face a challenge in maintaining sealing performance when the fastening force of the fixing screws is decreased, leading to potential leakage and reduced reliability.
Innovation Solution
The liquid ejecting head is designed with a nozzle plate, a case, a circuit substrate, a holder, a first seal member, screws for fixation, and adhesive to secure the holder to the case, ensuring consistent sealing performance even if the screw fastening force is reduced. This configuration includes a protrusion on the holder and a recess on the case with adhesive between them, and specific adhesive placement to prevent leakage and maintain sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the fastening force of the fixing screw is decreased, then the device complexity or assembly stress is reduced, but the sealing performance between the holder and the case deteriorates
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the holder and the case. This adhesive maintains the sealing performance even when the screw fastening force is reduced, as it fills gaps and provides continuous sealing along the peripheral surface where the holder contacts the case.
Solution Approach 2:
The sealing mechanism transitions from relying solely on mechanical fastening (screw force) to a combined mechanism involving adhesive bonding. This changes the sealing parameter from being force-dependent to being area-dependent, allowing sealing to maintain effectiveness at lower fastening forces.
2Stress or pressure
If the fastening force of the fixing screw is decreased, then the stress on components is reduced, but the sealing performance between the holder and the case deteriorates
Solution Approach 1:
The adhesive acts as a stress-distributing intermediary that maintains sealing effectiveness without requiring high concentrated fastening stress. It distributes the sealing function across a larger peripheral area, reducing the need for high localized stress from screws.
Solution Approach 2:
The sealing approach changes from stress-based (mechanical compression from screws) to area-based (adhesive coverage on peripheral surface). This allows lower fastening stress while maintaining sealing reliability through increased sealing area provided by the adhesive layer.
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 effectively suppresses the decrease in sealing performance between the holder and the case, preventing leakage and ensuring reliable operation even with reduced screw fastening force, thereby enhancing the stability and efficiency of the liquid ejecting apparatus.
Implementation Method 1
an adhesive fixing the holder to the case
Data Source
AI summary
A liquid ejecting head includes a nozzle plate provided with nozzles configured to eject a liquid in a first direction; a case provided in a second direction that is opposite to the first direction with respect to the nozzle plate, and having a flow path pipe that defines a first flow path through which the liquid flows and which protrudes in the second direction; a circuit substrate provided in the second direction with respect to the case and having a first through-hole through which the flow path pipe penetrates; a first seal member provided in the second direction with respect to the circuit substrate; a holder provided in the second direction with respect to the first seal member and having therein a second flow path communicating with the first flow path; a screw fixing the holder to the case; and an adhesive fixing the holder to the case.