Liquid Discharge Head Ink Intrusion Prevention
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Solution Overview
Problem
The possibility of mist-state ink intrusion into the head body of a liquid discharge head, leading to malfunction, is a challenge in existing inkjet printing technologies.
Innovation Solution
A liquid discharge head design that includes a head body with discharge holes and pressurizing chambers, a flexible wiring board connected to pressurizing parts, a first member with a hole for the wiring board, and a second member that covers the hole, preventing ink intrusion by guiding the wiring board through the hole and out between the members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hole is provided in the first member to allow the flexible wiring board to pass through, then the wiring board can be electrically connected to the pressurizing parts, but mist-state ink can intrude through the hole into the head body causing malfunction
Solution Approach 1:
A sealing member (second member) is introduced as an intermediary element between the first member and the hole. This sealing member covers the hole from the opposite side of the flexible wiring board, creating a barrier that prevents ink intrusion while allowing the wiring board to pass through and maintain electrical connection. The sealing member acts as a mediator that resolves the conflict between needing an open hole for electrical connection and needing to prevent ink intrusion.
2Ease of operation
If the flexible wiring board is passed through the hole in the first member, then electrical connection to pressurizing parts is achieved, but the wiring board creates a pathway for ink to enter the head body
Solution Approach 1:
The sealing member serves as an intermediary that allows the flexible wiring board to pass through while blocking the harmful ink particles. The sealing member is positioned to cover the hole, and the wiring board passes through the sealing member rather than directly through the hole in the first member. This intermediary arrangement maintains the beneficial electrical connection while eliminating the harmful ink intrusion pathway.
Solution Approach 2:
The sealing member functions as a thin film or barrier structure that selectively allows the flexible wiring board to pass through while blocking ink particles. The sealing member creates a controlled passage that distinguishes between the flexible wiring board (which should pass) and ink particles (which should be blocked), using the properties of the sealing member material and structure to achieve this selective permeability.
Data Source
AI summary
The present invention aims to provide a liquid discharge head capable of reducing the possibility that ink intrudes into the interior thereof. The liquid discharge head includes a head body which has a plurality of discharge holes, a plurality of pressurizing chambers communicating with the discharge holes, and piezoelectric bodies disposed correspondingly to the pressurizing chambers, a flexible wiring board electrically connected to the piezoelectric bodies, a first member having a hole disposed on the head body, and a second member disposed on the first member. A part of the second member is disposed so as to cover the hole in a plan view. The flexible wiring board is passed through the hole and is led out from between the first member and the second member.