Liquid Discharge Head Damper Layout to Prevent Cracking
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Solution Overview
Problem
The provision of a communication path or hole in the damper member of a liquid discharge head, which communicates with the atmosphere, leads to a deterioration in the strength of the damper member, making it susceptible to damage.
Innovation Solution
The damper member is designed with a damper frame that includes a damper region with cavities, through holes, and communication paths arranged such that straight lines of communication paths are not identical, enhancing the structural integrity and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a communication path or communication hole is provided in the damper member to release internal pressure of the cavity, then the pressure release function is improved, but the strength of the damper member deteriorates making it susceptible to damage
Solution Approach 1:
The patent transitions from a single straight communication path to a three-dimensional zigzag path that moves in multiple directions (first in longitudinal direction, then in transverse direction, then again in longitudinal direction). This dimensional change allows the path to connect the cavity to the outside while avoiding straight-line weaknesses and distributing stress more evenly throughout the damper member structure.
Solution Approach 2:
The communication path is designed with curved or angled segments rather than straight lines, creating a zigzag configuration. This curvature approach strengthens the structure by avoiding stress concentration at straight path locations and distributing mechanical loads more effectively across the damper member.
2Reliability
If a communication path is provided in the damper member, then pressure release is enabled, but cracking occurs reducing durability
Solution Approach 1:
By extending the communication path into multiple dimensions with zigzag segments, the design avoids creating single-point failure zones. The multi-directional path distributes stress across different regions and orientations, preventing crack initiation and propagation that would occur in straight-line configurations.
Solution Approach 2:
The curved/zigzag communication path eliminates sharp corners and straight-line stress concentrations that lead to cracking. The angled and curved segments distribute mechanical stresses more uniformly, enhancing the long-term durability and resistance to fatigue cracking of the damper member.
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 improves the strength of the damper member, reducing the likelihood of cracking and ensuring effective pressure release from the cavities, thereby enhancing the durability and performance of the liquid discharge head.
Implementation Method 1
A liquid discharge head that deforms a piezoelectric body to discharge ink as liquid
Implementation Method 2
a damper member that absorbs vibrations due to the propagation of vibrations to a liquid chamber to which the piezoelectric body is adjacent
Implementation Method 3
a damper having flexibility
Data Source
AI summary
A liquid discharge head includes: a nozzle through which a liquid is to be discharged; an individual chamber in communication with the nozzle; a pressure generator to generate pressure in the individual chamber; and a damper member including: a damper having flexibility; and a damper frame supporting the damper, the damper frame having: a damper region having a cavity facing the damper; a through hole at one side of the damper region in a longitudinal direction of the damper member; a first communication path connecting the through hole and one circumferential end of the damper member in the longitudinal direction; and a second communication path connecting the through hole and one side of the cavity of the damper region in the longitudinal direction, the second communication path is shifted from the first communication path in a transverse direction orthogonal to the longitudinal direction.