Electrophotography and Development Physics by Lawrence B. Schein

By Lawrence B. Schein

The more and more vital and complex know-how of electrophotography (also known as xerography), regular to most folk because the expertise in photocopiers and laser printers, is the topic of this ebook, written for either the newcomer and the confirmed specialist. Introductory chapters acquaint the reader with the present prestige of electrophotography, together with its technical background and present and projected markets. substitute similar copying and printing applied sciences also are offered. One bankruptcy offers with the physics of the six method steps, with references giving entry to the unique literature. an additional bankruptcy issues out the demanding situations of the improvement subsystem, which determines the simplest reproduction caliber the client can obtain. major features of the program should not good understood and dear manpower-intensive empirical layout methods are nonetheless required. the rest of the publication includes a serious evaluation of the literature of improvement physics, a radical therapy of static electrical energy, and a dialogue of two-component, monocomponent and liquid improvement structures. After learning this fabric, the reader can have a operating wisdom of the physics of the full electrophotographic procedure and a close wisdom of what's recognized and never recognized approximately its most crucial subsystem, improvement.

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In the uncharged regions, the toner is charged by induction to the sign opposite to that of the photoreceptor and adheres electrostatically. 23-28]. In this process, the electrostatic latent image itself is transferred to a special paper 20 prior to development. The special paper is a dielectric-coated paper which is pressed into intimate contact with the photoreceptor, usually in a suitable bias field. As with Electrofax, the special paper requirement is a handicap; in addition the process is sensitive to contact geometry and ambient humidity.

47] invented another form in which photosensitive particles initially placed on top of thermoplastic migrate image-wise through the thin, temporarily softened thermoplastic. A solvent wash can be used to remove the thermoplastic and its residue of incompletely migrated pigments. Recent work is summarized by Vincett et al. 48]. 49] invented an elegant solution to the challenge of single-step full-color electrophotography. 52,53]. 54]. 55-63]. 64]. In this process conductive magnetic toner is chained up under conductive styli in the development zone by a magnetic field.

They predict the minimum transfer voltage needed to move the interface of transferred to untransferred toner to the photo conductor surface (in their model, when the predicted transfer efficiency is 100%). As might be expected, this voltage is related to the total toner charge and the ratio of the paper to toner dielectric thicknesses. Under the condition of low transfer efficiency, there is experimental support for their model. Characterization of transfer systems also has been carried out by Hida et al.

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