Inkjet Head Electrode Layout for Uniform Ink Ejection Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inkjet heads experience variations in ink ejection pressure due to inconsistencies in the polarization characteristics of piezoelectric members, despite uniform outer shapes.
Innovation Solution
The method involves correcting the distribution of ejection speed by adjusting the structure of the inkjet head to match the polarization characteristics of the piezoelectric members, specifically by altering the area of electrodes and pressure chambers to compensate for variations in residual polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer shapes of the piezoelectric members are made uniform, then the manufacturing precision is improved, but the ink ejection pressure variations worsen due to polarization characteristic variations
Solution Approach 1:
The patent applies local quality by making the electrode areas non-uniform to match the local polarization characteristics of piezoelectric members. Specifically, the electrode area is adjusted according to the residual polarization distribution, with smaller areas for members having larger residual polarization and larger areas for members having smaller residual polarization. This local adaptation compensates for manufacturing variations and achieves uniform ink ejection pressure across all nozzles.
Solution Approach 2:
The patent changes the physical parameter of electrode area to compensate for variations in piezoelectric member polarization characteristics. By adjusting the electrode area parameter based on measured residual polarization values, the system achieves consistent ink ejection pressure despite variations in piezoelectric member properties. This parameter adaptation transforms a reliability problem into a controllable design variable.
2Reliability
If the electrode areas are adjusted to compensate for piezoelectric member variations, then the ink ejection uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by measuring the residual polarization characteristics of each piezoelectric member before final assembly and pre-calculating the required electrode areas to achieve uniform ink ejection. This advance preparation allows the system to compensate for variations without requiring complex real-time control mechanisms during operation. The electrode area distribution is determined in advance based on the specific polarization characteristics of each 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 approach results in an inkjet head with reduced variations in ink ejection, ensuring more uniform droplet landing and improved image quality.
Implementation Method 1
a piezoelectric inkjet head that causes ink to be ejected from each of a plurality of nozzles so that the ink lands on a target medium. In this inkjet head, variations in pressure applied to ink ejected from the nozzles has been a problem. In a piezoelectric inkjet head, deformation corresponding to a voltage applied to a piezoelectric member is used to apply pressure to ink.
Data Source
AI summary
This display member (200) comprises an optical surface on which a predetermined treatment is performed and a member engagement section (202) that is connected to the optical surface and gripped by a first engagement member and a second engagement member of jigs (302). The member engagement section (202) has a thick section connected with a thin section of a smaller size than the thick section. A first relation in which the first engagement member and the second engagement member are separated from each other is obtained when the jigs (302) approach and pass over the thick section, and when said jigs (302) subsequently arrive at the thin section, a second relation is obtained in which the first engagement member and the second engagement member are brought closer together than while in the first relation. The member engagement section (202) is in line contact or surface contact with both the first engagement member and the second engagement member at least while in the second relation. The member engagement section (202) is clamped by the first engagement member and the second engagement member while in the second relation and is thereby held via the jigs (302) during the predetermined treatment.