Liquid Ejecting Head Wiring for Voltage Drop Reduction
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Solution Overview
Problem
The existing liquid ejecting heads face a voltage drop issue due to resistance in the wiring, leading to inconsistencies in the drive signal distribution to piezoelectric elements, affecting ejection characteristics such as ejection amount, direction, and speed.
Innovation Solution
The liquid ejecting head incorporates a wiring configuration with a first wiring portion formed linearly along an array of piezoelectric elements and a second wiring portion forming an annular path, which includes additional portions to connect and reinforce the wiring, reducing resistance and voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wiring is formed linearly along an array of piezoelectric elements, then the wiring structure is simple and easy to manufacture, but voltage drop due to resistance component becomes significant
Solution Approach 1:
The wiring is divided into multiple segments: a first wiring portion formed linearly along the array of piezoelectric elements, and a second wiring portion forming an annular path that includes first, second, third, and fourth portions. This segmentation allows the wiring to provide multiple current paths, reducing voltage drop while maintaining manufacturability through systematic division of the wiring function.
Solution Approach 2:
The wiring configuration transitions from a single-dimensional linear arrangement to a two-dimensional annular structure that surrounds the first wiring portion. This dimensional change creates multiple current paths and reduces the effective resistance, thereby improving voltage supply uniformity across the piezoelectric elements while maintaining a manageable wiring layout.
2Adaptability or versatility
If the wiring length is increased to cover all piezoelectric elements, then all elements can be driven, but voltage drop increases due to resistance
Solution Approach 1:
By forming the second wiring portion in an annular path that surrounds the first wiring portion, the patent creates multiple current paths between the drive signal source and the piezoelectric elements. This multi-dimensional wiring arrangement reduces the effective resistance and voltage drop while ensuring all elements receive the drive signal, thus reducing energy loss without sacrificing coverage.
Solution Approach 2:
The first and second wiring portions are combined to form an integrated wiring structure where the annular second wiring portion reinforces and supplements the linear first wiring portion. This merging creates redundant current paths that reduce overall resistance and voltage drop, allowing comprehensive coverage of all piezoelectric elements with improved electrical performance.
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 ensures a uniform voltage supply to piezoelectric elements, reducing errors in ejection characteristics and improving the reliability of ink ejection across the nozzles.
Implementation Method 1
a liquid ejecting head that ejects a liquid such as ink from a plurality of nozzles... a plurality of piezoelectric elements... drive elements for ejecting liquids from nozzles
Data Source
AI summary
There is provided a liquid ejecting head including a plurality of drive elements for ejecting liquids from nozzles, respectively, a base portion, and a wiring formed on the base portion to drive the plurality of drive elements, in which the wiring includes a first wiring portion formed along an array of the plurality of drive elements, and a second wiring portion forming an annular path with respect to the first wiring portion.