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Obtaining Reproduction of Continuous Tone

IP.com Disclosure Number: IPCOM000090794D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Crooks, W: AUTHOR [+3]

Abstract

In cascade development of electrostatic images, there is a phenomena termed edge effect. That is, only the outer edges of large image areas are developed. This edge effect phenomena can be overcome by one of several modifications to the conventional electrophotographic process. The photoconductive member is exposed through a screen or dot pattern after the photoconductive member has been electrostatically charged, but before it is exposed to the image. The photoconductive member is provided with a substantially transparent conductor and substrate and is exposed through its underside through a screen or dot pattern prior to electrostatically charging and exposing the other side of such member to an image.

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Obtaining Reproduction of Continuous Tone

In cascade development of electrostatic images, there is a phenomena termed edge effect. That is, only the outer edges of large image areas are developed. This edge effect phenomena can be overcome by one of several modifications to the conventional electrophotographic process. The photoconductive member is exposed through a screen or dot pattern after the photoconductive member has been electrostatically charged, but before it is exposed to the image. The photoconductive member is provided with a substantially transparent conductor and substrate and is exposed through its underside through a screen or dot pattern prior to electrostatically charging and exposing the other side of such member to an image. This modification is the same as the second one with the exception that the reverse side of the photoconductive member is exposed to a screen or dot pattern after the charging step but before the exposing step. The fourth modification is also the same as the second one except that the reverse side of the photoconductive member is exposed to the screen or dot pattern simultaneously with the exposure to the image on the other side of the member. The fifth modification is likewise the same as the second one except that the reverse side of the photoconductive member is exposed to the screen or dot pattern at the same time as the other side of the photoconductive member is simultaneously electrostatically charged and exposed t...