Dual Moisture Absorber Packing Body for Liquid Ejecting Heads
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Solution Overview
Problem
In ink jet type recording apparatuses, the moisture absorbing materials used to prevent humidity from affecting piezoelectric elements in liquid ejecting heads tend to lose their moisture absorbing properties due to absorbing test solutions or outside moisture, leading to decreased performance and potential corrosion.
Innovation Solution
A packing body with a moisture-proof material forming a sealed space containing a first physical adsorption-type moisture absorbing material and a second chemical reaction-type moisture absorbing material with higher absorbing capacity, allowing moisture to transfer from the first to the second material, thereby recovering the moisture absorbing property of the first material and enhancing its capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moisture absorbing material is disposed in the accommodating space to prevent humidity from affecting piezoelectric elements, then the reliability of the piezoelectric element is improved, but the moisture absorbing material absorbs moisture from outside air or test solution, causing its moisture absorbing property to decrease
Solution Approach 1:
The moisture absorbing material is divided into two separate spaces: the first moisture absorbing material is disposed in the accommodating space (first space) near the piezoelectric element, while the second moisture absorbing material is disposed in the packing space (second space) away from the liquid flow path. This segmentation prevents the second material from absorbing test solution moisture while still providing overall moisture protection to the system.
Solution Approach 2:
The atmosphere communication hole acts as an intermediary channel that allows controlled moisture transfer between the first and second spaces. The first moisture absorbing material serves as a local protector for the piezoelectric element, while the second moisture absorbing material in the packing space serves as a backup and overall humidity controller, creating a multi-layered protection system.
2Manufacturing precision
If the liquid ejecting head is densified to improve manufacturing precision, then the liquid flow path becomes finer and more complex, but test solution is more likely to remain in the liquid flow path, causing the moisture absorbing material to absorb moisture and lose its moisture absorbing property
Solution Approach 1:
By separating the moisture absorbing materials into two distinct locations (accommodating space and packing space), the patent ensures that even if test solution remains in the liquid flow path, only the first moisture absorbing material is potentially affected, while the second material in the packing space remains fresh and effective as a backup moisture absorber.
3Ease of operation
If the sealing member with moisture absorbing material is detachably fixed to the reservoir forming substrate, then ease of operation is improved, but the moisture absorbing material is exposed to outside air, causing it to absorb moisture and decrease in moisture absorbing property
Solution Approach 1:
The second moisture absorbing material is pre-disposed in the packing space before the liquid ejecting head is sealed and put into service. This preliminary placement ensures that a fresh moisture absorbing material is always available in the packing space, compensating for the moisture absorption that occurs when the sealing member is detachably fixed and exposed to outside air.
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 protects piezoelectric elements by maintaining the moisture absorbing capacity of the first material, preventing corrosion and ensuring reliable operation of the liquid ejecting head by utilizing the higher absorbing capacity of the second material.
Implementation Method 1
the first moisture absorbing material may be a physical adsorption-type moisture absorbing material
Implementation Method 2
the second moisture absorbing material may be a chemical reaction-type moisture absorbing material
Data Source
AI summary
There are included a packing material that has a moisture-proof property and forms a third space, a liquid ejecting head that includes a case member which forms a second space communicating with the third space, and a first moisture absorbing material and a piezoelectric element which are disposed in the second space, and is disposed in the third space, and a second moisture absorbing material that has a higher moisture absorbing property than that of the first moisture absorbing material and is disposed in the third space.