Method for magnetically developing electrostatic images

Abstract

Abstract AN IMPROVED METHOD FOR MAGNETICALLY DEVELOPING ELECTROSTATIC LATENT IMAGES ON A PHOTOCONDUCTIVE SURFACE IN THE FORM OF A BELT. THE METHOD STEPS INCLUDE FORMING THE LATENT ELECTROSTATIC IMAGES ON A BELT SURFACE AND TRANSPORTING THE BELT SURFACE ALONG A PREDETERMINED PATH WHICH IS SUBSTANTIALLY PARALLEL TO AND CLOSELY SPACED TO AN ENDLESS BELT CARRYING DEVELOPER MATERIAL INCLUDING A MAGNETIC COMPONENT AND AN ELECTROSTATIC COMPONENT. THE PHOTOCONDUCTIVE BELT AND DEVELOPER MATERIAL TRANSPORT MOVE IN THE SAME DIRECTION. ONE OR MORE MAGNETIC FIELDS ARE ROTATED IN THE DEVELOPMENT ZONE ON AN AXIS WHICH MOVES IN THE SAME DIRECTION AS DEVELOPER MATERIAL TRANSPORT AND PHOTOCONDUCTIVE BELT. THE ROTATING MAGNETIC FIELDS MOVE AT SPEEDS WHICH ARE APPROXIMATELY TWO TO THREE TIMES THE SPEED OF THE DEVELOPER MATERIAL TRANSPORT AND ABOUT FOUR TO IVE TIMES THE SPEED OF HOTOCONDUCTIVE BELT SUCH THAT THE DEVELOPER MATERIAL IS CAUSED TO RAISED TOWARDS AND AWAY FROM THE ELECTROSTATIC IMAGES TO BE DEVELOPED IN A WAVE-LIKE FORMATION REPEATEDLY DURING THE DEVELOPMENT TO EFFFECT A HIGH QUALITY OF THE IMAGES. UPON DEVELOPMENT OF THE IMAGE THE DEVELOPED IMAGE IS TRANSFERRED TO A SUPPORT SHEET TO FORM A PERMANENT COPY. TO ENCHANCE SOLID AREA DEVELOPMENT AN ELECTRIC BIAS IS COUPLED TO THE DEVELOPER TRANSPORT TO SUPPRESS IMAGE BACKGROUND FIELD.

Inventors

• 👤 P Wu

Bibliographic Details