Photon Scattering Surface Feature Mapping for Nanometer Defect Detection
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Solution Overview
Problem
Current methods for inspecting articles on production lines, such as hard disk drives, are inadequate in detecting and mapping surface and subsurface defects like particle contamination, scratches, and voids, which can degrade performance and quality.
Innovation Solution
An apparatus comprising a photon emitter, optical setup, and photon detector array that emits photons onto an article's surface and maps features by detecting scattered photons, allowing for precise detection and characterization of defects, including those smaller than 100 nm, at a rate of more than one article per 100 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used, then the inspection process is simple, but the detection precision of surface features is insufficient
Solution Approach 1:
The patent replaces conventional mechanical or simple optical inspection methods with a photon-based detection system. Photons are emitted onto the article surface, and scattered photons are detected to map surface features, enabling precise detection of defects smaller than 100 nm without complex mechanical contact or multi-step procedures
Solution Approach 2:
The patent utilizes changes in photon scattering parameters (intensity, angle, wavelength) when photons interact with surface features. By detecting these parameter changes in scattered photons, the system achieves high-precision mapping of surface defects while maintaining a relatively streamlined apparatus
2Measurement precision
If detailed surface mapping is performed, then the detection accuracy improves, but the processing time increases
Solution Approach 1:
The inspection system processes articles in a systematic sequence, emitting photons and detecting scattered photons in periodic cycles for each article. This allows detailed mapping to be achieved through repeated, standardized measurement cycles rather than continuous complex scanning, improving both accuracy and throughput
Solution Approach 2:
The system performs preliminary photon emission and detection setup before actual surface mapping begins. By pre-configuring the photon emission parameters and detection geometry, the system eliminates setup time during the actual inspection process, enabling rapid detailed mapping of multiple articles
3Productivity
If high-speed processing is implemented, then the productivity increases, but the measurement precision decreases
Solution Approach 1:
The photon emission and detection process operates continuously without interruption for each article. Photons are emitted and scattered photons are detected in an unbroken sequence, allowing high-speed processing while maintaining precision because the measurement process itself is continuous rather than discrete or interrupted
Solution Approach 2:
The patent replaces slow mechanical scanning or multi-step inspection procedures with rapid photon emission and detection. The optical-photon-based measurement inherently occurs at the speed of light, enabling high processing rates while maintaining the precision needed for detecting nanometer-scale surface features
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 efficient and accurate detection and mapping of surface features, improving product quality by identifying and characterizing defects down to nanometer sizes, enhancing manufacturing precision and throughput.
Implementation Method 1
a photon detecting means for detecting photons scattered from features in the surface of the article
Data Source
AI summary
Provided herein is an apparatus, including a photon emitting means for emitting photons onto a surface of an article, a photon detecting means for detecting photons scattered from features in the surface of the article; and a mapping means for mapping the features in the surface of the article, wherein the apparatus is configured to process more than one article every 100 seconds.