Liquid Ejection Head Wiring Spring Prevents Contact Separation
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Solution Overview
Problem
The separation of the wiring member from the actuator member in liquid ejection heads due to increased radius at the boundary of the connection and folded portions, non-uniform sealant curing, and rotational moments, leading to disconnection of contacts.
Innovation Solution
Incorporating a spring mechanism to urge the connection portion toward the actuator member, utilizing a leaf spring with first and second urging portions to maintain contact integrity and balance heat dissipation, while using adhesive tape and sealant to secure the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the folded portion hangs down, then the radius of the boundary between the connection portion and the folded portion increases, but a force in a direction away from the actuator member is applied to the vicinity of the boundary, causing the second contact to separate from the first contact
Solution Approach 1:
The urging member applies a preliminary force in the opposite direction to the separating force that occurs when the folded portion hangs down. This counteracting force prevents the second contact from separating from the first contact, maintaining reliable electrical connection despite the increased boundary radius.
Solution Approach 2:
The urging member is pre-configured to apply a constant urging force to the connection portion before any separation occurs. This preliminary action ensures that the contact remains firmly connected to the actuator member, preventing separation caused by gravitational hanging of the folded portion.
2Reliability
If sealant is disposed along the end portion of the connection portion, then the space between the connection portion and actuator member is blocked, but non-uniform curing shrinkage speed applies a rotation moment to the wiring member, causing oblique disposition and contact separation
Solution Approach 1:
The urging member applies a stabilizing force to the connection portion that counteracts the rotation moment generated during sealant curing. This preliminary counteracting action prevents the wiring member from becoming oblique, ensuring the second contact remains properly aligned with the first contact despite non-uniform sealant shrinkage.
Solution Approach 2:
The urging member provides a cushioning force that absorbs and compensates for the stresses generated during sealant curing. This beforehand cushioning prevents the rotation moment from causing oblique disposition or contact separation, maintaining wiring member stability throughout the curing process.
3Reliability
If the connection portion is urged toward the actuator member, then the wiring member is less likely to separate, but the spring mechanism adds structural complexity
Solution Approach 1:
The urging member is designed as a self-service component that automatically maintains the connection portion against the actuator member without requiring external control systems. The elastic or spring-based structure self-regulates the urging force, providing reliable contact connection while minimizing structural complexity and eliminating the need for additional control mechanisms.
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
Prevents separation of the wiring member from the actuator member, ensures reliable electrical connection, and efficiently dissipates heat from the driving ICs, reducing manufacturing costs and maintaining operational stability.
Implementation Method 1
The spring includes a first urging portion configured to urge the connection portion toward the actuator member
Implementation Method 2
heat generated in the driving IC is released to the heat dissipation member
Data Source
AI summary
A liquid ejection head includes a channel member, an actuator member, a wiring member, and a spring. The channel member has a liquid channel including a nozzle. The actuator member is disposed on an upper surface of the channel member. The actuator member has an upper surface on which a first contact is disposed. The actuator member is configured to cause the nozzle to eject liquid. The wiring member includes a connection portion and a folded portion. The connection portion is disposed on the upper surface of the actuator member. The connection portion includes a second contact electrically connected to the first contact. The folded portion is folded upward from an end of the connection portion. The spring is disposed above the connection portion. The spring includes a first urging portion configured to urge the connection portion toward the actuator member.