Magnetic Brush Developer Structure
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
For a dual component developer, the magnetic brush magnetic structure is the key component. It determines the developer performance which includes print density, background, print texture, leading or trailing edge uniformity, bead carry out and materials life. The magnetic field of a magnetic brush can be divided into six zones, as illustrated in Fig. 1. The pre-nip, nip and post-nip zones are the most critical. In order to improve print density, more properly charged toner must be introduced to the latent image within the development zone. This could be achieved by increasing carrier bead rotational motion and linear velocity in the direction of mean flow. However, an excessive magnetic force within the nip restricts the bead rotational and lateral motion and also reduces the carrier flow compliancy.