Staggered Liquid Jet Head Nozzles and Resistors
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Solution Overview
Problem
Ink jet recording heads face challenges in achieving high image quality and printing speed while maintaining low noise and cost, due to issues with ink droplet size, bubble formation, and heater arrangement, which affect printing efficiency and manufacturing costs.
Innovation Solution
The design incorporates staggered nozzles with different inkjet orifice sizes and rectangular heat generating resistors, allowing for efficient ink delivery and bubble management without increasing manufacturing costs or destabilizing the printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ink jet recording head is reduced in ink droplet size to increase resolution, then image quality is improved, but printing efficiency decreases and heater arrangement becomes difficult
Solution Approach 1:
The ink jet recording head is divided into multiple nozzle rows (first nozzle row and second nozzle row) with different nozzle pitches. This segmentation allows each row to be optimized for different functions: one row for high-resolution dot formation and the other for efficient ink deposition, thereby maintaining both high image quality and printing efficiency
Solution Approach 2:
Different nozzle rows are assigned different local characteristics - specifically different nozzle pitches and dot sizes. The first nozzle row uses smaller dots with higher pitch for fine detail, while the second nozzle row uses larger dots with lower pitch for efficient coverage. This local differentiation resolves the contradiction between resolution and printing efficiency
2Manufacturing precision
If the nozzle pitch is increased to improve image quality, then resolution is improved, but the distance from the ink delivery channel increases making bubble generation inefficient
Solution Approach 1:
The heating system is segmented into multiple heater rows corresponding to different nozzle rows. Each heater row is positioned at the optimal distance from its respective nozzle row, ensuring efficient bubble generation regardless of the nozzle pitch. This segmentation allows high-resolution nozzles to be positioned far from the ink delivery channel without sacrificing heating efficiency
Solution Approach 2:
Each heater row is locally optimized for its specific nozzle row. The first heater row is positioned close to the first nozzle row for efficient heating of small dots, while the second heater row is positioned appropriately for the second nozzle row. This local optimization maintains bubble generation efficiency across different nozzle pitches
3Ease of manufacture
If rectangular heaters are used for short nozzles and square heaters for long nozzles, then manufacturing is simplified, but electrical resistance differences require separate power sources increasing cost
Solution Approach 1:
The heater dimensions are specifically designed so that heaters for short nozzles and heaters for long nozzles have equal electrical resistance. By carefully adjusting the length and width parameters of the rectangular heaters to match the square heaters' resistance, all heaters can be driven by a single power source, simplifying the overall system while maintaining manufacturing ease
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 achieves high image quality and increased printing speed by optimizing ink droplet size and bubble generation, while maintaining cost-effectiveness and stable printing performance.
Implementation Method 1
said second recording element includes a plurality of heat generating resistors
Implementation Method 2
the electro-thermal transducers are adversely affected by the cavitation attributable to the collapsing of bubbles
Implementation Method 3
an ink jetting method which employs an electro-thermal transducer as an energy generating element
Data Source
AI summary
A liquid ejecting head includes a plurality of ejection outlets for ejecting droplets wherein said ejection outlets include first ejection outlets (100a) and second ejection outlets (100b) which are disposed at least at one side of a liquid supply opening (500), wherein said first ejection outlets are nearer from said liquid supply opening than said second ejection outlets, and said first ejection outlets and said second ejection outlets are arranged in a staggered fashion; first recording elements corresponding to the first ejection outlets includes one heat generating resistor (400a) in the form of a rectangular shape; second recording element corresponding to the second ejection outlets includes a plurality of heat generating resistors (400b) each of which is in the form of a rectangular shape and which are adjacent to each other at the long sides thereof, said plurality of heat generating resistors being electrically connected in series.