Liquid Jet Head Nozzle Guard Grounding Against Static Damage
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Solution Overview
Problem
Liquid jet heads are susceptible to damage from static electricity when a conductive cover component is not electrically coupled to other components, leading to potential damage through nozzle holes.
Innovation Solution
A liquid jet head design that includes a nozzle guard made of metal, electrically coupled to a frame ground via a conductive part fixed outside the jet module, ensuring the nozzle guard is at the same potential as the frame ground, preventing static electricity from damaging the head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conductive cover component is used to protect the nozzle plate, then the nozzle plate is protected from damage, but static electricity can accumulate on the cover and potentially damage the liquid jet head through the nozzle holes
Solution Approach 1:
The conductive cover component is electrically connected to the base member, which is grounded, ensuring that the cover and base member are at the same electrical potential. This eliminates potential differences that would cause static electricity to discharge through the nozzle holes, while maintaining the protective function of the cover.
2Reliability
If the conductive part is fixed inside the jet module, then the electrical coupling is achieved, but the fixation work becomes difficult and workability decreases
Solution Approach 1:
The conductive part is positioned to extend from the nozzle guard through the base member to the external environment, changing the spatial arrangement from an internal-only fixation to an external extension. This allows the conductive part to be accessed and fixed from the outside of the jet module, significantly improving workability while maintaining reliable electrical coupling.
3Productivity
If multiple liquid jet heads are disposed in the thickness direction, then the installation density increases, but the complexity of ensuring proper electrical grounding for each head increases
Solution Approach 1:
The base member serves multiple functions: it provides mechanical support for the jet module, acts as an electrical ground reference, and provides a mounting surface for the conductive part. This multi-functionality simplifies the grounding configuration for multiple jet heads disposed in the thickness direction, as each head can utilize the same base member grounding structure.
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
Prevents damage from static electricity by equalizing potential, improving workability, allowing for higher density installations, and reducing component count and cost.
Implementation Method 1
a conductive part which has conductivity, is electrically coupled to the jet module and the nozzle guard via the base member, and is configured to couple the nozzle guard to a frame ground
Data Source
AI summary
Damage of a liquid jet head from static electricity is prevented. The liquid jet head according to an aspect of the present disclosure includes a base member, a jet module mounted on the base member, and configured to jet a liquid, a nozzle plate provided with a nozzle hole configured to jet the liquid, a nozzle guard made of metal and configured to protect the nozzle plate, and a conductive part which has conductivity, is electrically coupled to the jet module and the nozzle guard via the base member, and is configured to couple the nozzle guard to a frame ground.