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Dual-beam diode laser scanning system with a spot control method for ultrahigh-speed laser beam printers

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Abstract

Diode lasers have replaced gas lasers in laser beam printer (LBP) systems except in the ultrahigh-speed class (> 15,000 lines/m). The problems in using diode lasers in high-speed LBPs are that high-power diode lasers and highly sensitive photoconductors must be prepared and that a high-speed rotating polygonal mirror with a large radius is necessary, because the wavelength of the diode laser is 1.5–2.0 times longer than that of gas lasers. We propose to solve these difficulties simultaneously by employing two lasers and introducing a sample and hold spot control method. With this method, the power emitted by each laser and the rotation speed of the polygonal mirror can be reduced to half of those of single-diode laser systems. We had a choice of using either a laser diode array or two separate lasers. However, there are some difficulties involved in using a diode laser array due to the electrical and thermal crosstalk between the two diodes and the large ratio of the spacing between two lasers to the spot diameters. Therefore, we decided to use the two separate lasers. In this case, the spacing between two scan lines must be maintained even with thermal and mechanical displacements of laser diodes and optical components, because the printing quality is greatly degraded by spacing errors.

© 1986 Optical Society of America

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