Used Canon PLA-501/600FA Close-up Contact Mask Alignment Exposure Camera

The Canon PLA-501/600FA is a fully automated proximity/contact mask aligner designed for 5-inch (125mm) to 6-inch (150mm) wafers. It belongs to Canon’s classic PLA series. Unlike the previously mentioned MPA series, the PLA series places a distinct engineering emphasis on automation, optical uniformity, and the handling of larger-sized substrates.

Core Positioning: A High-Efficiency Tool for Small-Format and Compound Semiconductor Mass Production

This equipment serves as a primary lithography tool for production lines handling 6-inch wafers and smaller—particularly for compound semiconductors (such as GaAs, GaN, and SiC) and acoustic wave devices (SAW/BAW). It delivers micron-level pattern transfer accuracy while maintaining high throughput, making it well-suited for specialized process lines that are cost-sensitive yet require stable yields.

Key Technologies and Design Features

High Illumination Intensity and Superior Uniformity: The PLA series (including the 600FA configuration) is typically equipped with a high-power mercury lamp and an optimized "fly-eye" lens illumination system. This ensures an exceptionally uniform light intensity distribution across the entire exposure field (e.g., a 6-inch or larger square field), effectively preventing pattern distortion at the edges caused by underexposure.

Precise Proximity Gap Control: In proximity exposure, the minute gap between the photomask and the wafer is a critical factor determining resolution and defect rates. The system features high-precision automatic gap setting and auto-leveling capabilities, which minimize diffraction effects during exposure while preventing scratches to the photomask.

Fully Automated, High-Efficiency Wafer Handling: The "FA" in the model name stands for "Fully Automatic." The system integrates cassette-to-cassette loading, pre-alignment, and robotic wafer transport, significantly reducing particle contamination caused by human intervention and increasing production throughput. Capability for handling specialized substrates: Beyond standard silicon wafers, the PLA-501/600FA offers excellent compatibility with compound semiconductor substrates—including those with varying thicknesses or even slight warpage—while maintaining stable alignment accuracy.

Summary

With its superior light intensity uniformity, precise gap control, and fully automated high-volume production architecture, the Canon PLA-501/600FA serves as a stable and reliable lithography cornerstone for the manufacturing of 5/6-inch compound semiconductors, MEMS, and discrete devices.