Inkjet Printhead Vertical Ink Channels Heater Density
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Solution Overview
Problem
Existing thermal bubble inkjet printheads are limited in printing resolution, speed, and manufacturing cost due to the space occupied by elongated ink slots and horizontal ink flow channels, which restrict the density of heaters and nozzles on the substrate.
Innovation Solution
The implementation of vertically oriented ink channels through the substrate replaces the traditional ink slot and shortens horizontal ink flow channels, allowing for a higher density of heaters and nozzles, thereby improving printing resolution and speed while reducing substrate surface area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If elongated ink slot and horizontal ink flow channels are used, then ink can be supplied to heaters, but substrate surface area is wasted which limits heater density
Solution Approach 1:
The patent transitions from horizontal ink flow channels to vertical ink channels that pass through the substrate thickness direction. This dimensional change allows ink to be supplied directly to heaters located on the rear surface of the substrate, eliminating the need for elongated horizontal channels and significantly reducing the substrate surface area occupied by ink supply structures.
2Quantity of substance
If elongated ink slot occupies large surface area, then ink supply is ensured, but heater density and printing resolution are restricted
Solution Approach 1:
By changing the ink channel orientation from horizontal to vertical, the patent enables direct ink supply to multiple heaters through the substrate thickness. This allows higher heater density without compromising ink supply capacity, thereby improving printing resolution while maintaining adequate ink delivery to all heaters.
3Productivity
If horizontal ink flow channels are used, then ink flow path is established, but printing speed is limited due to lower heater density
Solution Approach 1:
The vertical ink channels enable direct ink delivery to heaters on the rear substrate surface, allowing much higher heater density compared to horizontal channel configurations. Increased heater density directly translates to higher printing speed as more ink can be processed and ejected simultaneously.
4Manufacturing precision
If more heaters are packed in same surface area, then printing resolution improves, but manufacturing complexity increases
Solution Approach 1:
By moving the ink supply path to the vertical dimension through the substrate, the patent simplifies the arrangement of multiple heaters on the rear surface. Each heater receives ink independently through its own vertical channel, allowing high-density heater packing without complex horizontal channel routing, thus improving printing resolution while managing manufacturing complexity.
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 enhances printing resolution and speed while reducing manufacturing costs by optimizing the substrate surface area usage and increasing the density of heaters and nozzles.
Implementation Method 1
ink is vaporized instantaneously by heaters (heating resistor) in the inkjet printhead for producing high-pressure bubbles
Implementation Method 2
heaters (heating resistor) in the inkjet printhead for producing high-pressure bubbles
Data Source
AI summary
An inkjet printhead including a substrate, a plurality of heaters, multiple pairs of leads, an ink chamber layer, and a nozzle plate is provided. The substrate has a top surface and a plurality of ink channels through the substrate in the direction substantially vertical to the top surface. The heaters, the multiple pairs of leads, and the ink chamber layer are disposed on the surface of the substrate. The multiple pairs of leads are electrically coupled to the corresponding heaters respectively, and the heaters are respectively adjacent to the corresponding ink channels. The ink chamber layer has a plurality of ink chambers which respectively expose the corresponding heaters and the corresponding ink channels. The nozzle plate is disposed on the ink chamber layer and has a plurality of nozzles through the nozzle plate.