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本文叙述了一种三片型F.θ透镜,其视场角接近90°,相对孔径为1:27。波长4880A和5145A,分辨率在整个视场内均达到30l/mm。文字畸变小于1％。
This article describes a three-piece type F. θ lens with a field of view close to 90 ° and a relative aperture of 1:27. Wavelength 4880A and 5145A, the resolution in the entire field of view are up to 30l / mm. Text distortion is less than 1%.