Liquid Discharge Head With Internal Grounding for Shock Resistance
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Solution Overview
Problem
Existing liquid discharge heads face issues with maintaining effective grounding due to potential damage or detachment of ground members when subjected to external shocks or vibrations, affecting printing quality.
Innovation Solution
A liquid discharge head design featuring a ground wire inserted within the housing, connected to a leaf spring that contacts the inner side of the housing, ensuring stable grounding and resistance to external shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground member contacts the outer side of the liquid discharge head, then grounding is achieved, but the ground member may be damaged or fall off when external shock or vibration is applied
Solution Approach 1:
The ground member is inverted from contacting the outer side to contacting the inner side of the housing. This inversion places the ground member in a protected position where it is shielded from external shocks and vibrations, preventing damage and detachment while maintaining grounding functionality.
Solution Approach 2:
A ground wire is introduced as an intermediary element that connects the ground member (contacting the inner side of the housing) to the external grounding point. This intermediary allows the ground member to be positioned safely inside the housing while still achieving effective grounding through the wire connection.
2Strength
If the ground member is positioned inside the housing, then protection from external shocks is improved, but electrical connection to external grounding point must be established
Solution Approach 1:
The ground wire serves multiple functions: it provides the electrical connection from the internally positioned ground member to the external grounding point, and it can also be integrated with existing wiring structures in the housing. This multi-functionality achieves the necessary electrical connection without significantly increasing overall system complexity.
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 design maintains reliable grounding and prevents damage to ground members, ensuring consistent electrical connection and improved printing quality even under external disturbances.
Implementation Method 1
a piezoelectric body configured to expand and contract in an axial direction in response to a drive voltage so as to actuate the opening and closing member such that the nozzle is opened and closed
Implementation Method 2
a ground wire that is electrically connected to the ground member and to an external grounding point
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A liquid discharge head 202 includes a nozzle forming member 22 having a nozzle configured to discharge liquid; an opening and closing member 21 configured to open and close the nozzle; a piezoelectric body 9 configured to expand and contract in an axial direction in response to a drive voltage so as to actuate the opening and closing member such that the nozzle is opened and closed; a first housing member 1 having a cylindrical shape and configured to house the piezoelectric body 9; and a ground member 10 configured to contact an inner side of the first housing member 1.