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METHOD OF IMPROVING MAXIMUM DENSITY AND TONE RANGE OF ELECTRONIC RECORD IMAGE
METHOD OF IMPROVING MAXIMUM DENSITY AND TONE RANGE OF ELECTRONIC RECORD IMAGE
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机译:提高电子记录图像最大密度和色调范围的方法
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摘要
The image quality obtainable by an electrographic copying process in which an electrostatic latent image formed by imagewise exposure of a uniformly charged photoconductive layer, or otherwise, is developed with a toner can be improved if the latent image comprises discrete charge bearing zones, preferably formed by a supplementary exposure through a half-tone screen, and if additionally the toner is electrically conductive either intrinsically or as a result of electrical break-down. In this manner, the maximum density obtainable in a copy can be increased and the contrast decreased sufficiently to allow good reproduction of both continuous tone and high contrast images.
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