Abstract
A variable format laser scanner and plotter has been developed for the graphic arts and other industries. 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 (e.g., spinning polygon and rotating drum), this leads to efficient use of memory, drastically reduced data rates, and increased resolution at high magnification. The machine is capable of scanning a 20 in. by 24 in. area at 1500 lines per inch in four minutes. Optical encoders are employed on both scan axes to insure geometric accuracy. The system is microprocessor controlled 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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