A Lens for High Speed Printer used in Electrophotography

WAKIMOTO Zenji

doi:10.11370/isjep.3.3_45

A photographic copying lens of F/2.0 in relative aperture and of 135 mm in focal length was designed and manufactured, which makes an image, magnified 2.3 times, of letters appea ring on the fluorescent screen of 7″ Charactron tube, onto an electrophotographic sensitive plate, such as running electrofax paper or rotating Se drum in Xerography. The whole system serves as a “high speed printer” for the output of electronic computers etc.<br>The aberrations of the lens was corrected in the wavelength region of 400∼600 mμ, as near ultraviolet rays are almost fully cut off by the lens itself, and the lens is equally suitable for dye-sensitized electrofax papers as well as Se plate used in Xerography. At full aperture of F/2. 0, it showed a resolving power (at the object plane) of at least 20 lines/mm at any point in the object plane of 120 mm in diameter, and an even illumination over the entire image field, and makes sharp images of letters on electrofax papers sensitized with Rose bengal. The “printing speed” of the system was limited within ca. 2000 letters/sec in the case of electrofax papers, owing to the low sensitivity of these papers. This speed is expected to reach 10,000∼20, 000 letters/sec by using Xerographic recording, as the sensitivity of Se plate is 5∼10 times higher than that of electrofax papers.

A Lens for High Speed Printer used in Electrophotography

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