Liquid Discharge Head Protective Member Bending Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing liquid discharge heads are prone to bending due to heat generation and ambient temperature changes, which can lead to deformation and adverse effects on recording quality, especially when static electricity or physical contact occurs with the electric wiring board.
Innovation Solution
A liquid discharge head design that includes a plate-like protective member with bent portions fixed to the channel member, covering the electric wiring board to prevent deformation and protect it from external factors, while maintaining the rigidity of the head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a plate-like protective member is used to cover the electric wiring board, then protection against static electricity and physical contact is improved, but heat-induced deformation and bending of the liquid discharge head occur
Solution Approach 1:
The protective member is divided into multiple sections with bent portions that can independently deform. This segmentation allows different parts of the protective member to accommodate thermal expansion differently, reducing overall deformation of the liquid discharge head while maintaining protection functionality.
Solution Approach 2:
The protective member incorporates bent portions with specific geometric parameters (depth, radius, position) that change its mechanical properties. These parameter changes enable the protective member to flex under thermal stress, absorbing expansion forces and preventing transmission to the liquid discharge head, thus resolving the contradiction between protection and deformation.
2Strength
If the protective member is made rigid to maintain head rigidity, then structural stability is improved, but thermal expansion causes bending and deformation
Solution Approach 1:
The protective member transitions from a completely rigid structure to a dynamic structure with bent portions that can adaptively deform under thermal stress. This dynamic design allows the protective member to maintain overall rigidity for structural stability while local bent portions flex to accommodate thermal expansion, preventing bending of the liquid discharge head.
Solution Approach 2:
The protective member combines rigid and flexible characteristics through its composite structure with bent portions. This composite design enables different regions to serve different functions: rigid sections maintain structural integrity and protection, while bent portions provide flexibility to absorb thermal stress, resolving the contradiction between rigidity and thermal stability.
3Object-affected harmful factors
If the protective member covers the entire electric wiring board, then comprehensive protection is improved, but heat accumulation and deformation increase
Solution Approach 1:
The protective member is segmented into multiple sections separated by bent portions. This segmentation creates gaps or relief zones that allow heat to dissipate more effectively, reducing heat accumulation under the protective member while still providing comprehensive coverage and protection of the electric wiring board.
Solution Approach 2:
The protective member has non-uniform local qualities with bent portions strategically positioned to create thermal relief zones. These local variations in structure allow heat to escape from specific areas while maintaining protection in other areas, resolving the contradiction between comprehensive protection and heat accumulation.
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 bending of the liquid discharge head and protects the electric wiring board from static electricity and physical contact, ensuring stable recording quality by distributing thermal expansion and maintaining the head's rigidity.
Implementation Method 1
a plate-like protective member directly or indirectly fixed to the channel member to cover the electric wiring board. In a case where a direction in which the recording element substrate is viewed from the channel member is defined as downward, the protective member includes a bent portion configured to be bent in a transverse direction of the liquid discharge head
Data Source
AI summary
A liquid discharge head includes a recording element substrate including a discharge port. A channel member is configured to supply the recording element substrate with a liquid. An electric wiring board is configured to supply the recording element substrate with power. A plate-like protective member is directly or indirectly fixed to the channel member. In a case where a direction in which the recording element substrate is viewed from the channel member is defined as downward, the protective member includes a first bent portion configured to be bent in a transverse direction of the liquid discharge head. The first bent portion is located at a position that is above an upper end of the channel member and below a midpoint of a line segment connecting the upper end of the channel member and an upper end of the protective member.