Laser Interference Inspection for Ink Jet Liquid Chemicals
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Solution Overview
Problem
Conventional methods for inspecting liquid chemicals discharged from an ink jet head are inefficient, as they cannot simultaneously assess discharge speed, angle, volume, and normal/abnormal discharge conditions, and require significant space and time, especially when using drop watchers.
Innovation Solution
A method involving the irradiation of at least two laser beams onto the liquid chemicals to detect interference patterns generated by laser scattering, allowing for the simultaneous identification of discharge speed, angle, volume, and normal/abnormal discharge conditions, using an inspection apparatus with a laser beam generating member and receiving member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a drop watcher is used to inspect liquid chemical conditions, then measurement precision is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent replaces the mechanical drop watcher system with an optical inspection system using laser beams. The laser beams interact with the liquid chemicals to generate interference patterns that encode multiple discharge parameters, eliminating the need for complex mechanical measurement devices while maintaining high measurement precision.
Solution Approach 2:
The inspection system uses a single laser-based apparatus to simultaneously measure multiple discharge conditions (discharge speed, discharge angle, volume, and normal/abnormal discharge) that would otherwise require separate specialized devices. This multi-functional approach reduces overall device complexity while comprehensive inspection capability.
2Productivity
If conventional inspection methods are used for liquid chemicals, then device complexity is kept simple, but productivity decreases due to inability to inspect multiple parameters simultaneously
Solution Approach 1:
The patent combines multiple inspection functions into a single integrated system. By using laser beams that generate interference patterns containing information about discharge speed, angle, volume, and normal/abnormal discharge, the system simultaneously extracts multiple parameters from a single measurement event, dramatically improving productivity.
Solution Approach 2:
The system transforms physical discharge parameters into optical interference pattern parameters. The laser scattering and interference effects convert mechanical discharge characteristics (speed, angle, volume) into measurable optical properties, enabling rapid simultaneous measurement of multiple parameters without complex mechanical sensors.
3Measurement precision
If multiple inspection methods are used to assess different discharge parameters, then measurement precision for each parameter is improved, but loss of time increases due to sequential inspection
Solution Approach 1:
The inspection system performs continuous simultaneous measurement of all discharge parameters in a single pass. The laser beams continuously interact with the liquid chemicals, and the interference patterns continuously encode information about all parameters, eliminating sequential inspection delays and enabling real-time monitoring.
Solution Approach 2:
The system uses the spatial dimension of interference patterns to encode multiple parameters simultaneously. Different discharge parameters are mapped to different spatial characteristics of the interference pattern (position, intensity, shape), allowing parallel extraction of multiple parameters from a single two-dimensional pattern without temporal sequencing.
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
Enables rapid and precise inspection of liquid chemical conditions, reducing the required space and time, and allowing for real-time identification of various parameters, thereby improving the accuracy of pattern formation in printing processes.
Implementation Method 1
detecting an interference pattern obtained from a laser scattering generated by passing the liquid chemicals through the at least two laser beams
Implementation Method 2
detecting an interference pattern obtained from a laser scattering
Data Source
AI summary
In a method of inspecting liquid chemicals discharged from an ink jet head according to example embodiments, at least two laser beams may be irradiated onto the liquid chemicals discharged from the ink jet head, and the conditions of the liquid chemicals may be identified by detecting an interference pattern obtained from a laser scattering generated by passing the liquid chemicals through the at least two laser beams.