Liquid Ejecting Head Beam Structure for Strength
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Solution Overview
Problem
The challenge is to enhance the mechanical strength of liquid ejecting heads while reducing their size, as thinner walls compromise structural integrity.
Innovation Solution
The design incorporates a pressure chamber substrate, a flow path substrate with supply and communication holes, a nozzle plate, a housing unit with beam-like portions, and compliance units to improve mechanical strength and reduce adhesive interference, allowing for efficient ink flow and pressure chamber communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the wall thickness of the unit case is decreased to reduce the size of the liquid ejecting head, then the size is reduced, but the mechanical strength becomes insufficient
Solution Approach 1:
The housing unit is divided into multiple sections with beam-like portions creating separate compartments. This segmentation allows the thin-walled structure to maintain rigidity through internal support elements while keeping the overall wall thickness reduced for size miniaturization.
Solution Approach 2:
Beam-like portions are added in the internal dimension of the housing unit rather than increasing external wall thickness. This dimensional approach provides structural reinforcement without increasing the external size of the liquid ejecting head, resolving the contradiction between compact size and mechanical strength.
2Ease of manufacture
If adhesive is applied to the joining surface of the housing unit, then the housing unit is joined to the first surface, but the adhesive may attach to the first beam-like portion and harden to obstruct ink flow
Solution Approach 1:
The beam-like portions are positioned and structured to be separated from the adhesive application zone. By extracting the beam-like portions from the joining surface area, the adhesive can be applied freely to join the housing unit without risk of contamination that would obstruct ink flow pathways.
Solution Approach 2:
The design creates a spatial intermediary zone between the adhesive application area and the ink flow channels containing beam-like portions. This separation acts as an intermediary that prevents direct contact between adhesive and ink pathways, eliminating the harmful effect while maintaining manufacturing simplicity.
Data Source
AI summary
A liquid ejecting head includes a pressure chamber substrate in which a pressure chamber space is formed, a flow path substrate having a first surface on which the pressure chamber substrate is installed and a second surface that is on the opposite side to the first surface, and in which a first space, a supply hole that enables communication between the first space and the pressure chamber space, and a communication hole that communicates with the pressure chamber space are formed, a nozzle plate that is installed on the second surface and in which a nozzle that communicates with the communication hole is formed, a second space that is installed on the first surface and that communicates with the first space of the flow path substrate, a housing unit in which an opening portion that communicates with the second space is formed, a compliance unit that is flexible and installed on the second surface and that seals the communication hole and the first space, and a beam-like portion that extends between inner wall surfaces of the second space in the housing unit.