Liquid Ejecting Head Wiring for Uniform Voltage Distribution
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Solution Overview
Problem
The existing liquid ejecting heads face voltage drop issues due to resistance in the wiring, which affects the uniformity of the driving signal and ejection characteristics of ink from nozzles, particularly when the wiring path lengths are unevenly distributed between the input section and energy generation elements.
Innovation Solution
The liquid ejecting head is designed with a wiring configuration where the path length between the input section and the third energy generation element is shorter than the paths to the first and second energy generation elements, reducing voltage drops and ensuring uniform voltage distribution across the energy generation elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wiring is formed in a straight line extending in the direction in which multiple piezoelectric elements are arrayed, then the wiring structure is simple and easy to manufacture, but a voltage drop caused by resistance component of the wiring occurs
Solution Approach 1:
The wiring is divided into multiple sections with different path lengths assigned to different piezoelectric elements. Specifically, the wiring path to the third piezoelectric element (located between the first and second elements) is made shorter than the paths to the first and second elements, creating segmented wiring sections that compensate for voltage drops across the array
Solution Approach 2:
Different wiring path lengths are assigned to different locations in the piezoelectric element array. The wiring configuration is optimized locally for each element's position, with the intermediate element (third element) receiving a shorter wiring path to compensate for its position between the other two elements, ensuring uniform voltage distribution across the entire array
2Area of stationary object
If wiring path lengths are unevenly distributed between input section and energy generation elements, then the wiring layout is compact, but ejection characteristics become non-uniform due to voltage drops
Solution Approach 1:
The wiring path lengths are intentionally varied as a design parameter to compensate for voltage drops. By changing the path length parameter for different elements (shorter path to intermediate elements, longer paths to end elements), uniform voltage distribution is achieved despite compact layout constraints
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 minimizes the difference in voltage drops along the wiring section, leading to more uniform ejection characteristics of ink, including amounts, directions, and rates from the nozzles, thereby improving the overall printing performance.
Implementation Method 1
a piezoelectric element serving as the energy generation element
Data Source
AI summary
A length of a path between the input section and the third energy generation element in the wiring section is shorter than a length of a path between the input section and the first energy generation element in the wiring section and shorter than a length of a path between the input section and the second energy generation element in the wiring section.