Water-Resistant Solid Moisture Absorbent for Precision Instruments
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Solution Overview
Problem
Existing precision instruments, such as liquid ejecting heads and MEMS devices, face challenges with moisture ingress leading to performance degradation and ejection characteristic fluctuations due to the sealing methods used to protect driving elements, which also restrict downsizing and increase dust-related issues.
Innovation Solution
Incorporating a solid moisture absorbent with water-resistant properties into the internal space of precision instruments, specifically designed to absorb moisture and reduce pressure fluctuations, while maintaining a non-sealed communication path to prevent structural crosstalk and dust rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the atmosphere communication path of the adhesive escape space portion is closed to block moisture, then moisture protection is improved, but pressure fluctuation occurs in the accommodation space causing ejection characteristic changes
Solution Approach 1:
The patent divides the internal space into two distinct regions: a sealed accommodation space for the driving element and a non-sealed adhesive escape space. This segmentation allows the accommodation space to be protected from moisture while the adhesive escape space remains open for pressure equalization, resolving the contradiction between moisture protection and pressure stability.
Solution Approach 2:
The patent introduces a moisture absorbent as an intermediary substance placed in the adhesive escape space. This mediator absorbs moisture that enters through the open communication path, providing moisture protection without requiring sealing, thus maintaining pressure stability while protecting against moisture ingress.
2Reliability
If a commercially available bag-shaped desiccant is installed to absorb moisture, then moisture protection is improved, but the apparatus size increases and dust rise problems occur
Solution Approach 1:
The patent changes the physical form parameter of the moisture absorbent from a large bag-shaped desiccant to a fine granular material. This parameter change enables the moisture absorbent to be dispersed and distributed throughout the adhesive escape space, providing effective moisture protection in a compact form factor that does not increase apparatus size.
Solution Approach 2:
The patent employs a moisture absorbent with porous structure characteristics that can be filled into the adhesive escape space. This porous material provides high surface area for moisture absorption while occupying minimal volume, effectively protecting against moisture without requiring additional space.
3Reliability
If a commercially available bag-shaped desiccant is installed to absorb moisture, then moisture protection is improved, but dust rise occurs causing ejection failure
Solution Approach 1:
The patent changes the physical form parameter of the moisture absorbent from a bag structure to fine granular material with controlled particle size. This parameter change eliminates dust rise issues by ensuring the granular material is sufficiently fine and cohesive, while still providing effective moisture absorption capability.
Solution Approach 2:
The patent uses a composite moisture absorbent material that combines moisture-absorbing properties with dust-suppressing characteristics. This composite material effectively absorbs moisture while maintaining low dust rise property, preventing ejection failure.
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
The solution effectively protects driving elements from moisture, suppresses pressure fluctuations, and allows for downsizing while minimizing dust-related issues, enhancing the reliability and performance of precision instruments.
Implementation Method 1
a moisture absorbent which is a solid material of which a surface has a water resistance property
Implementation Method 2
a solid material of which a surface has a water resistance property
Data Source
AI summary
Provided is a precision instrument including a moisture absorbent in an internal space, in which the moisture absorbent is a solid material of which a surface has a water resistance property.