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Browse Prior Art Database

FILMING - TWO-STEP DEVELOPMENT

IP.com Disclosure Number: IPCOM000024165D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

A two-step development method is proposed to develop the latent electrostatic image in the xerographic imaging process. The image is first developed with a two-component developer (toner and carrier) which is depleted of extremely small-sized toner particles or "finesrl. The partially developed image is then brought into a cloud of fine developer to complete the development of the image.

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XEROX DISCLOSURE JOURNAL

FILMING - TWO-STEP DEVELOPMENT Proposed Daniel J. Donalies Classification

U.S. C1. 96/1 Int. C1. G03g

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A two-step development method is proposed to develop the latent electrostatic image in the xerographic imaging process. The image is first developed with a two- component developer (toner and carrier) which is depleted of extremely small-sized toner particles or "finesrl. The partially developed image is then brought into a cloud of fine developer to complete the development of the image.

Apparatus for this development method is illustrated in the figure wherein the latent electrostatic image resides on belt 1, which is guided into the development area by roller 3. Toner in housing 5 is depleted of the fines by means of an aerosol generator cylinder 7. Cylinder 7 comprises a reference electrode 9 coated with a dielectric material 11 supporting on its exterior a grid electrode 13. Aerosol generator cylinder 7 depletes the toner of fine material having a high charge to mass ratio by collecting the fines on the grid electrode. As the grid electrode is rotated, the fines are transported into the development zone of the latent electro- static image on web 1 at area 15. At area 15 the bias on the grid electrode is relaxed or reversed to generate a cloud of fine toner next to the partially developed latent image. The above process arran s a particle profile in the developed image whereby the large particles (low

top of the developed image...