Flat Coil Selective Excitation for Optoelectronic Component Inspection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for measuring electro-optical properties of optoelectronic components on a connection board, particularly when they are short-circuited, face challenges such as inability to perform selective measurements due to inadequate magnetic field densities and inefficient coil designs, which hinder process monitoring and optimization.
Innovation Solution
The use of a method involving two coils with a temporally variable electromagnetic alternating field to selectively excite optoelectronic components, allowing for independent excitation and measurement of individual components on a connection board, even when they are short-circuited, using a flat coil design for improved field convergence and reduced excitation power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional coil design is used to excite optoelectronic components, then multiple components emit light simultaneously, but selective measurement of individual components becomes impossible
Solution Approach 1:
The patent divides the connection board into multiple small regions, with each region containing one or few optoelectronic components. This spatial segmentation allows the electromagnetic resonant circuit to be localized to specific regions, enabling selective excitation and measurement of individual components rather than all components simultaneously.
Solution Approach 2:
The patent creates localized electromagnetic fields in specific regions of the connection board by inducing electromagnetic resonant circuits in small regions. This local quality approach ensures that only components in the targeted region are excited, while other regions remain unaffected, enabling precise selective measurement.
2Measurement precision
If high magnetic field densities are used to excite individual optoelectronic components in small regions, then selective excitation is achieved, but achieving the required field density becomes very difficult with conventional wire coils
Solution Approach 1:
The patent transitions from conventional three-dimensional wire coils to planar flat coils that are integrated directly into the connection board structure. This dimensional change allows the coils to be manufactured using standard PCB techniques, making them reproducible and inexpensive even on a small scale, while still achieving the required magnetic field densities.
Solution Approach 2:
The patent changes the geometric parameters of the coil design from conventional wire coils to flat coils with optimized dimensions and winding patterns. This parameter optimization enables the coils to generate sufficient magnetic field densities for selective excitation while being manufacturable using standard fabrication processes.
3Measurement precision
If optoelectronic components are measured after singulation, then individual measurement is possible, but production time increases and rejects are not reduced
Solution Approach 1:
The patent enables electro-optical property measurements to be performed on optoelectronic components while they are still mounted on the connection board in a lead frame composite, before singulation. This preliminary measurement action allows for pre-sorting and process optimization without delaying the production workflow, maintaining productivity while achieving individual component characterization.
4Measurement precision
If DC voltage is applied to measure electro-optical properties, then measurement is straightforward, but short-circuited components cannot be operated
Solution Approach 1:
The patent replaces the direct electrical connection method (DC voltage application) with an inductive coupling method using electromagnetic resonant circuits. This substitution allows measurement of electro-optical properties without direct electrical contact, enabling measurement of short-circuited components that cannot be operated with DC current.
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
This approach enables precise measurement of electro-optical properties, such as brightness and color, of individual optoelectronic components without exciting adjacent components, optimizing production processes and reducing rejects by allowing for better control over production steps like conversion material application.
Implementation Method 1
The excitation of the electromagnetic resonant circuit comprises inducing an electrical alternating voltage in the electromagnetic resonant circuit by generating a temporally variable electromagnetic alternating field by means of a first coil and by means of a second coil
Implementation Method 2
exciting at least one electromagnetic resonant circuit, which is formed by the at least one optoelectronic component and the connection board, such that the at least one optoelectronic component is excited to emit electromagnetic radiation
Data Source
AI summary
A method and a device for inspecting an optoelectronic component are disclosed. In an embodiment, the method includes exciting at least one electromagnetic resonant circuit, formed by the at least one optoelectronic component and the connection board, such that the at least one optoelectronic component emits electromagnetic radiation, wherein exciting the electromagnetic resonant circuit comprises applying an electrical alternating voltage in the electromagnetic resonant circuit by generating a temporally variable electromagnetic alternating field by a first coil and a second coil, wherein the first coil and the second coil are movable with respect to the connection board.