Liquid Ejecting Head Pressure Adjusting Mechanism
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Solution Overview
Problem
Existing liquid ejecting heads face challenges in maintaining sufficient displacement of compliance members to manage pressure fluctuations in liquid chambers, leading to variations in ejecting properties such as droplet weight and speed, which can degrade image quality and require increased head size or additional compliance members.
Innovation Solution
A liquid ejecting head with a pressure adjusting mechanism that adjusts the supply pressure to the liquid chamber, allowing for increased displacement of the compliance member, thereby effectively managing pressure fluctuations without the need for larger or additional compliance members, and maintaining miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the compliance member is bent to protrude toward the liquid chamber side in an initial state, then the liquid pressure can be reduced to negative values, but the displacement magnitude of the compliance member becomes insufficient to cope with large pressure fluctuations
Solution Approach 1:
The compliance member is pre-configured in a bent state protruding toward the liquid chamber side before operation. This preliminary deformation prepares the member to accommodate subsequent pressure fluctuations by providing initial displacement capacity, allowing the system to handle negative pressure conditions while maintaining sufficient range for coping with large pressure variations during operation.
Solution Approach 2:
The invention changes the initial geometric parameters of the compliance member by bending it to protrude toward the liquid chamber side. This parameter modification (initial curvature and position) optimizes the member's ability to respond to pressure changes, enabling it to provide adequate displacement magnitude throughout the operating pressure range including negative pressure conditions.
2Reliability
If the dimensions of the compliance member are increased or a compliance member is separately added to compensate for insufficient displacement magnitude, then the displacement capacity increases, but the size of the liquid ejecting head increases
Solution Approach 1:
Instead of increasing the physical dimensions of the compliance member, the invention changes its initial geometric state by bending it to protrude toward the liquid chamber side. This parameter change (initial deformation) effectively increases the available displacement capacity within the same physical space, allowing the compliance member to cope with large pressure fluctuations without increasing the overall head size.
Solution Approach 2:
The compliance member is designed with dynamic deformation capability through its bent initial configuration. This allows the member to dynamically adjust its position and displacement magnitude in response to pressure changes, providing sufficient compliance performance within a compact structure without requiring additional space or larger dimensions.
3Volume of moving object
If the compliance member has insufficient displacement magnitude, then the liquid ejecting head remains compact, but the ejecting properties such as droplet weight and speed vary, degrading image quality
Solution Approach 1:
The compliance member is pre-bent to protrude toward the liquid chamber side before operation. This preliminary configuration ensures that the member has sufficient displacement capacity available from the start, which stabilizes the liquid pressure and maintains consistent ejecting properties (droplet weight and speed) throughout operation, thereby ensuring image quality while keeping the head compact.
Solution Approach 2:
By changing the initial geometric parameters of the compliance member (bending it to protrude), the system achieves sufficient displacement capacity without increasing head size. This parameter modification ensures stable ejecting properties and consistent droplet characteristics, resolving the contradiction between compact size and ejecting precision.
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 ensures reliable suppression of pressure fluctuations in the liquid chamber, reducing variations in ejecting properties and allowing for more precise control of droplet ejection, while maintaining a compact head size.
Implementation Method 1
a portion of the liquid chamber is sealed by a flexible compliance member (compliance sheet), and the compliance member deforms according to a fluctuation in pressure in the liquid chamber to even out the fluctuation in liquid pressure
Data Source
AI summary
A liquid ejecting head includes a pressure chamber that communicates with a nozzle which ejects liquid, a liquid chamber that communicates with the pressure chamber, a flexible compliance member that defines a portion of the liquid chamber, and a pressure adjusting mechanism that adjusts a supply pressure of liquid supplied to the liquid chamber. The pressure adjusting mechanism can adjust displacement of the compliance member.