Precision Measurement Applications of Vision Measuring Machines (OMM) in the Semiconductor Industry

I. The Stringent Precision Measurement Demands of Semiconductor Manufacturing

The semiconductor industry is the core driver of modern technology – from smartphones and computers to artificial intelligence, IoT, and 5G, semiconductor devices are everywhere. As chip processes move toward smaller line widths and higher integration, the demands on dimensional measurement precision and efficiency have become exceptionally stringent.

Throughout the complex manufacturing flow – wafer fabrication, chip design and manufacturing, packaging and testing – every stage relies on high-precision measurement. Micron-level line widths, spacing, critical dimensions (CD), and complex geometries on wafers directly determine chip performance and yield. Even the slightest deviation can cause performance degradation or scrap. At the same time, high-volume production demands rapid measurement – traditional methods are too slow for modern high-speed production lines.

II. Vision Measuring Machine (OMM): The Core Equipment for Semiconductor Dimension Measurement

A Vision Measuring Machine (also called Optical Measuring Machine or Video Measuring System) is a high-precision dimensional inspection device based on optical imaging. Its core workflow: a high-resolution industrial camera captures digital images, and proprietary measurement software performs image processing and geometric calculations to automatically extract points, lines, circles, arcs, and other geometric elements, computing dimensions, positions, and geometric tolerances.

Compared to traditional contact tools, optical dimension measurement offers significant advantages: non-contact, non-destructive – eliminating scratch or deformation risks; high efficiency, fully automatic – supporting CNC programming for one-click measurement with dozens of parameters acquired in a single run; micron-level precision – with automatic data archiving and SPC report generation.

Sinowon, a leader in Optical Measuring Machine (OMM) technology, delivers Vision Measuring Machines renowned for exceptional optical performance, stable accuracy, efficient automation, and powerful geometric analysis. The AutoVision series, for example, achieves XY accuracy ≤1.5+L/200 (μm), Z accuracy ≤4+L/200 (μm), and repeatability ±2 μm – fully meeting semiconductor dimensional measurement requirements.

III. What Can a Vision Measuring Machine Measure in the Semiconductor Industry?

Sinowon`s OMM covers dimensional measurement needs across the entire semiconductor manufacturing process. Key parameters include:

1. 2D Optical Dimension Measurement

• In wafer fabrication: precise measurement of line width and spacing, ensuring circuit patterns conform to design; measurement of feature distances and pattern position for overlay alignment; analysis of angles, arc radii, and 2D shape contours.
• In packaging: inspection of saw street width, BGA ball diameter, wire bond arc height to verify process precision; measurement of lead pitch and terminal coplanarity; inspection of ball diameter and pitch for QFN, BGA, and other packages; measurement of wafer bonding spacing, lead coplanarity, and package warpage.

2. 3D Height and Flatness Measurement – Line Laser Scanning Technology
2D measurement alone cannot capture 3D structural characteristics. Sinowon`s OMM optionally integrates a line laser scanning module for precision 3D topography and dimensional measurement.

Line laser 3D scanning projects a line-shaped laser beam onto the surface; a CCD sensor captures reflected light deformation, and triangulation converts displacement into height data. A single scan acquires millions of points, enabling high-speed, high-precision 3D profile acquisition. By setting measurement points to obtain X, Y, Z coordinates and using least-squares plane fitting, flatness is calculated as the maximum minus minimum distance from each point to the fitted plane.

In semiconductor applications, line laser scanning is primarily used for:

• Wafer thickness and flatness – precise measurement to determine if wafers have been damaged during handling or storage.
• Package height and coplanarity – precise measurement of height differences, step height, coplanarity, and bump height on chip surfaces. BGA solder ball height and flatness inspection is a typical example, with dynamic repeatability within 0.010 mm.
• Lead coplanarity – rapid acquisition of lead height distribution to evaluate compliance with process requirements.
• Wire bond arc height – inspection of bonding wire arc parameters to verify packaging precision.

IV. How OMM Solves Semiconductor Pain Points

Pain Point 1 – Contact measurement damages delicate workpieces
Semiconductor wafers and chips are extremely delicate; contact measurement easily causes scratches or contamination. Sinowon`s OMM uses purely optical non-contact measurement – completely avoiding surface damage to valuable parts.

Pain Point 2 – Micro-features are difficult to measure
Feature sizes continue to shrink; traditional tool microscopes are inadequate in both efficiency and accuracy. Sinowon`s OMM features a high-resolution camera and high-clarity lens, capable of clearly capturing fine features. The lens supports automatic zoom with single-pixel calibration for simple, fast operation.

Pain Point 3 – Low batch inspection efficiency
Manual sampling cannot guarantee full-batch quality. Sinowon`s OMM enables fully automatic measurement – operators simply place workpieces, set parameters via programming, and the instrument completes tasks quickly and accurately. Preset programs enable one-click automated inspection of multiple wafers in a batch. Programmable 5-ring 8-zone LED surface illumination and transmitted parallel LED contour lighting with 256-level brightness adjustment adapt to different device types.

Pain Point 4 – 3D dimensional information is difficult to obtain
Traditional OMMs are mainly limited to 2D measurement, unable to acquire height and flatness. Sinowon`s OMM integrates line laser 3D scanning for 2D/3D hybrid measurement. Point laser profile scanning enables height-direction contour measurement; line laser 3D scanning enables spatial measurement. The VisionX software supports multiple profile and 3D measurement modes, seamlessly connecting 2D/3D hybrid measurement.

Pain Point 5 – Measurement data management and traceability are challenging
Sinowon`s OMM automatically generates detailed reports (e.g., SPC) that visually present dimension distribution, trends, and process capability (CPK) – providing immediate, reliable data for process optimization. Measurement data is automatically archived, offering traceable evidence for process improvement.

V. Conclusion

As the semiconductor industry pursues higher integration and smaller line widths, the accuracy of geometric dimension measurement has become critical. Sinowon, a leader in Optical Measuring Machine (OMM) technology, delivers Vision Measuring Machines that integrate line laser scanning and other advanced technologies – providing the semiconductor industry with comprehensive precision measurement solutions from 2D optical dimension measurement to 3D height and flatness analysis. Sinowon remains committed to delivering trusted measurement solutions for the global semiconductor industry through continuous innovation.

For more semiconductor measurement solutions, visit the Sinowon official website: www.sinowon.com.