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15 April 1993 80-channel optical recording unit for laser plotter
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This paper explains a new optical recording unit with 80 semiconductor lasers ((lambda) equals 780 nm), and it can be used in the drum rotation type prepress equipment for film exposure. The optical system consists of three units: a unit composed of an off-axis paraboloid mirror and a stereographic projection lens, a both-side telocentric zoom lens unit, and an afocal reduction lens unit. A both side telocentrical optical design has been adopted for each of the units. The stereographic projection lens and the off-axis paraboloid mirror combine to keep the beam intervals regular. As a result, excellent imaging performance and telocentric characteristics at the exposure plane are now available for all magnification ranges.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Masahide Okazaki "80-channel optical recording unit for laser plotter", Proc. SPIE 1780, Lens and Optical Systems Design, 178019 (15 April 1993);


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