Liquid Ejecting Head Compliance Sheet Bonding
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Solution Overview
Problem
Existing ink jet recording heads face challenges with joining failures and ink leakage due to low rigidity of flow channel members, and the use of rigid members increases material and manufacturing costs.
Innovation Solution
A liquid ejecting head design that incorporates a compliance sheet supported by a canopy portion, bonded to a non-metallic first member and holder, which reduces the need for a rigid member and minimizes material costs while enhancing bonding strength and preventing peeling and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid member is used to bond the compliance sheet to ensure joining strength, then the bonding strength is improved, but the material cost increases
Solution Approach 1:
The invention uses a flexible support member instead of a rigid member to bond the compliance sheet. The support member has a bending modulus of elasticity that is 1/50 to 1/5 of that of the compliance sheet, providing sufficient support while maintaining flexibility and reducing material costs associated with rigid materials like metal.
Solution Approach 2:
The invention changes the key parameter from rigidity to flexibility by selecting a support member with a bending modulus of elasticity that is significantly lower than the compliance sheet (1/50 to 1/5). This parameter change allows the support member to provide adequate structural support while avoiding the high material costs of rigid materials.
2Reliability
If a rigid member is used to bond the compliance sheet to prevent peeling, then the joining reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The flexible support member with appropriate bending modulus provides sufficient structural support to prevent peeling of the compliance sheet during operation, while being easier and cheaper to manufacture than rigid members. The flexibility allows for simpler manufacturing processes without compromising joining reliability.
Solution Approach 2:
By changing from rigid to flexible materials with a specific bending modulus ratio (1/50 to 1/5 of the compliance sheet), the invention achieves reliable joining without the complex manufacturing processes required for rigid members, thereby reducing manufacturing costs.
3Reliability
If the rigidity of the inlet is increased to prevent peeling and ink leakage, then the joining reliability is improved, but the device complexity increases
Solution Approach 1:
The flexible support member provides the necessary rigidity to the inlet region to prevent peeling and ink leakage, while maintaining overall device simplicity. The support member's flexibility allows it to conform to the device structure without requiring additional complex components or assembly steps.
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 suppresses peeling and ink leakage, reduces material costs, and improves the bonding strength by using non-metallic materials with matching coefficients of linear expansion, ensuring stable ink ejection and reduced manufacturing complexity.
Implementation Method 1
a compliance sheet that absorbs vibrations of liquid on an upstream side of the common liquid chamber
Implementation Method 2
the compliance sheet can be supported by the canopy portion
Implementation Method 3
the first member and the compliance sheet can securely be joined to each other with an adhesive
Implementation Method 4
using non-metallic materials with matching coefficients of linear expansion, ensuring stable ink ejection
Data Source
AI summary
A liquid ejecting head includes a plurality of actuators, a plurality of pressure chambers that are provided so as to correspond to the actuators, and communicate with a common liquid chamber, a first member that defines the common liquid chamber, and includes a compliance sheet that absorbs vibrations of liquid on an upstream side of the common liquid chamber, and an inlet that is formed so as to penetrate the compliance sheet, a canopy portion that is provided at an open peripheral edge of the inlet of the first member, and has a receiving surface to which the compliance sheet is joined, and a receiving portion that is provided opposite the inlet across the canopy portion, and receives liquid introduced from the inlet.