First laser plotter in action

This is a video of the first high-speed, high accuracy, large format laser plotter in action (late 1970s). (There is no sound.) The micro-meters around the plate provides the setting for the laminated thickness of the various media such as film, glass, printed circuit panels, which have been a photo finish. The high power density, argon-ion UV-laser light source could be attenuated exposed on film, applied full power for photoresist or, as shown here to get instant image DuPont visualize watermarks proof paper, which was used to exposeCheck board layout and design. The laser scan was 18 cm wide and accurate to one thousandth of an inch over the entire 18 "by 24" area. The image is 2 minutes and had 500 times faster than the fastest plotter was available. The existing hard disks and tape speeds could not deliver the data rate required. The original Gerber format was converted vector data to raster data and compressed to an IBM mainframe. The data were then specifically in real time from a decompresseddecompressor designed microprocessor board in a Digital Equipment PDP-11 computer. EOCOM soon developed the first raster image processor (RIP) to vector data and text to shapes, which were then converted to data in real time by the RIP-grid to grid supply is necessary to convert the data rate. This first laser plotter was built by my data EOCOM Corporation for Western Electric. EOCOM then sold them for 3 / 4 million U.S. dollars (1970 money).

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