Browse Prior Art Database

Controlling Developer Break In Effects

IP.com Disclosure Number: IPCOM000082830D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fuller, SR: AUTHOR [+4]

Abstract

A specially prepared developer mixture comprising toner and carrier particles is prepared for use in developer units to control break-in effects of the mixture.

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Controlling Developer Break In Effects

A specially prepared developer mixture comprising toner and carrier particles is prepared for use in developer units to control break-in effects of the mixture.

A mixture of toner and carrier is utilized in a conventional office copying machine to develop electrostatic images on the surface of a photoconductive drum. The toner and carrier particles triboelectrically charge one another, causing the toner particles to become preferentially attracted to the electrostatic image areas on the drum.

In order to maintain the proper ratio of toner and carrier particles, an automatic toner concentration control system may be employed, such as that described in U. S. patent 3,756,192. This system optically monitors the color of the mixture of the black toner particles and lighter carrier particles.

When a new developer mixture is utilized, the median particle size of the fresh toner added thereto is high causing an atypical amount of carrier surface to become visible to the optical detector. As the developer unit operates on the mixture of carrier and toner, fine toner particles (e.g., less than 5 microns) are created which tend to adhere to the carrier surface. In order to simulate this condition for a new mixture of carrier and toner particles, toner fines are added to the mixture prior to its incorporation into the developer unit.

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