초록

A method and apparatus using ion projection to form a tri-level latent image on a charge retentive surface. The tri-level image which comprises two image areas and a background area is utilized for highlight imaging.

대표청구항 ▼

Method of forming tri-level images, said method including the steps of: using ion projection apparatus, forming a tri-level latent electrostatic image on a charge retentive surfce which image comprises first and second image areas and a background area which are at discrete voltage levels; electrica

Method of forming tri-level images, said method including the steps of: using ion projection apparatus, forming a tri-level latent electrostatic image on a charge retentive surfce which image comprises first and second image areas and a background area which are at discrete voltage levels; electrically biasing a first developer member to a voltage level that is offset from said background area, in the direction of said first image area; electrically biasing a second developer member to a voltage level that is offset from said background area, in the direction of said second image area; using said first developer member, applying a first toner to said charge retentive surface for developing said first image area; and using said second developer member, applying a second toner to said charge retentive surface for developing said second image area.