Abstract
A variable format laser scanner and plotter system has been devel-oped. By using a galvanometer to move the laser beam, the scan amplitude can be adjusted so that only the area of interest is scanned and digitized. Compared to other scanning methods (i.e., spinning polygon and rotating drum), this leads to efficient use of memory, drastically reduced data rates, and increased resolu-tion at high magnification. The machine is capable of scanning a 20X24 in. area at 1500 lines per inch in 4 min. Optical encoders are employed on both scan axes to ensure geometric accuracy. The system is microprocessor-con-trolled, with the operator interface through a CRT, keyboard, and menu-type software. Scanning and plotting are done in daylight with automatic roll film loading and processing.
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