The attraction belt unit of color LBPs must be capable of reliably attracting and transferring paper, then accurately registering the 4-color toner image on the paper. In previous systems paper was attracted and transferred by being positively charged with an attraction-charging roller. Also, a transfer roller was required for each color, making it hard to reduce the size of the attraction-belt unit.

By modifying the belt material, Canon developed a technology that generates a consistent attractive force regardless of temperature or humidity, making it possible to eliminate the attraction-charging roller. This, combined with efforts to reduce the diameter of the transfer rollers, led to a significantly slimmer electrostatic attraction belt unit.

With Canon's LBP5000, this ultra-slim attraction belt unit (approx. 35 mm thick) is built into the inner side of the door panel on the face of the printer, allowing one-step toner cartridge replacement upon opening the panel, achieving a revolutionary level of operating ease. The design combines the benefits of compactness, ease of use, and low cost.

Electrostatic Attraction Belt Unit