Liquid Discharge Head Damper Chamber Adhesive Control
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Solution Overview
Problem
Ink jet heads with large damper chambers face challenges in achieving stable damper performance due to adhesive application issues, where the adhesive may adhere to the bottom of the recess, resulting in a damper chamber size that is smaller than desired, affecting the damper performance.
Innovation Solution
The design includes a damper plate with a recess forming the damper chamber and a spacer plate with protrusions and grooves, where the adhesive is applied to the protrusions, preventing it from adhering to the recess bottom, and the plates are attached to secure the damper chamber size, ensuring stable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damper chamber is made large in size to improve damper performance, then the damper performance is improved, but the adhesive may adhere to the bottom of the recess during the adhesive applying process, causing the actual damper chamber size to be smaller than desired and resulting in unstable damper performance
Solution Approach 1:
Protrusions are formed in advance at the bottom of the recess before the adhesive applying process. These pre-formed protrusions serve as designated attachment points that guide the adhesive application, preventing the adhesive from adhering to the bottom surface of the recess and ensuring the damper chamber achieves the desired size and maintains stable damper performance.
2Ease of manufacture
If the adhesive is applied to the outer circumference of the roller and the roller is pressed on the lower surface of the damper plate, then the adhesive applying process is simplified, but the adhesive may enter the recess and adhere to the bottom surface, reducing the damper chamber size
Solution Approach 1:
Protrusions act as intermediary structures between the adhesive application area and the recess bottom surface. They provide controlled attachment points for the adhesive, preventing the adhesive from spreading to the bottom of the recess while maintaining the simplicity of the roller-based application method. This intermediary structure ensures precise damper chamber dimensions are achieved.
3Reliability
If the damper chamber is made large to improve damper performance, then the damper performance is improved, but the adhesive application becomes more difficult to control, leading to variable damper chamber sizes
Solution Approach 1:
Protrusions are pre-formed at the bottom of the recess to establish controlled adhesive attachment points before the adhesive applying process. This preliminary structuring makes adhesive application control easier, even for large damper chambers, by providing clear guidance on where the adhesive should adhere, thereby ensuring consistent damper chamber sizes and stable damper performance.
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 allows for the formation of a damper chamber of the desired size, providing stable damper performance and preventing adhesive attachment to unintended areas, thus ensuring consistent ink discharge and pressure attenuation.
Implementation Method 1
The first plate includes a first surface which is orthogonal to the second direction and on which a recess forming the damper chamber is formed. The second plate includes a second surface attached to the first surface via an adhesive.
Data Source
AI summary
A liquid discharge head includes a channel unit. The channel unit is formed therein with: a plurality of individual channels aligning in a first direction, a common channel extending in the first direction, a supply hole in communication with the common channel, and a damper chamber provided in a position overlapping with the supply hole in a second direction orthogonal to the first direction. The channel unit includes a first plate having a first surface where a recess is formed to constitute the damper chamber, and a second plate having a second surface attached to the first surface via an adhesive. A protrusion is provided on a bottom of such a first part of the recess as overlaps with the supply hole in the second direction.