Ink Jet Recording Head Resin Gradient for Color Mixing
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Solution Overview
Problem
Ink jet recording methods using recording heads inclined with respect to the direction of gravity often experience color mixing due to ink overflow and adherence to the ejection orifice peripheries, leading to unevenness and subsequent color mixing in recorded images.
Innovation Solution
The method involves using a recording head with adjacent ejection orifice arrays for different inks, where the ink with a smaller resin content is disposed at the upper side, and the angle between the ejection orifice surface and the direction of gravity is set between 0° and 90°, to minimize ink adherence and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a recording head with multiple ejection orifice arrays is used to eject multiple inks, then the productivity and functionality of the ink jet recording apparatus is improved, but color mixing occurs in the recorded image due to ink overflow and adherence to ejection orifice peripheries
Solution Approach 1:
The patent applies local quality by arranging ejection orifices with different resin content inks at specific positions within the recording head. The first ejection orifice array uses ink with higher resin content while the second array uses ink with lower resin content, creating localized compositional differences that prevent color mixing while maintaining multi-ink functionality
Solution Approach 2:
The patent changes the resin content parameter of ink between different ejection orifice arrays. By controlling the resin content to be higher in the first array and lower in the second array, the patent modifies the physical properties of ink at different locations to prevent overflow and color mixing, thus resolving the contradiction between multi-ink capability and image accuracy
2Volume of moving object
If the recording head is inclined with respect to the direction of gravity to miniaturize the apparatus, then the apparatus size is reduced, but ink overflow and adherence to ejection orifice peripheries increases causing color mixing
Solution Approach 1:
The patent applies local quality by creating compositional differences in ink at different ejection orifice positions. The first ejection orifice array uses ink with higher resin content to resist overflow on the inclined surface, while the second array uses ink with lower resin content, allowing the recording head to be inclined for miniaturization while maintaining image color accuracy
Solution Approach 2:
The patent inverts the conventional approach by not trying to prevent ink flow through mechanical means, but rather by strategically using ink composition differences to allow controlled flow patterns. By placing higher resin content ink in specific arrays, the patent enables the inclined configuration to work in favor of preventing color mixing rather than causing it
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 effectively suppresses color mixing in images by reducing ink adherence and unevenness at the ejection orifice peripheries, even under conditions of continuous recording and varying environmental conditions.
Implementation Method 1
a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, the first and second ejection orifice arrays being sequentially arranged from the bottom in the direction of gravity
Data Source
AI summary
A ink jet recording method, which uses an ink jet recording apparatus including: first and second inks each containing a coloring material; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, the first and second ejection orifice arrays being sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and at least partially overlap each other, includes recording, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is smaller than a content of the resin in the first ink.