Method of electrophotography with a photoconductive layer manifesting persistent internal polarization

Abstract

Abstract A METHOD OF ELECTROPHOTOGRAPHY COMPRISING THE STEP OF APPLYING A FIRST FIELD ACROSS A PHOTOSENSITIVE ELEMENT INCLUDING A TRANSPARENT HIGHLY INSULATIVE LAYER AND A PHOTOCONDUCTIVE LAYER MANIFESTING PERSISTENT INTERNAL POLARIZATION INTEGRALLY BONDED TO THE HIGHLY INSULATIVE LAYER TO DEPOSIT AN ELECTRIC CHARGE OF A FIRST POLARITY OPPOSITE TO THAT OF THE MAJORITY CARRIERS OF THE PHOTOCONDUCTIVE LAYER ON THE SURFACE OF THE HIGHLY INSULATIVE LAYER. AN IMAGE OF A SCREEN IS PROJECTED UPON THE PHOTOCONDUCTIVE LAYER FROM THE SIDE OF THE PHOTOSENSITIVE ELEMENT OPPOSITE THE HIGHLY INSULATIVE LAYER CONCURRENTLY WITH THE APPLICATION OF THE FIRST FIELD. THE SCREEN MAY BE INTEGRAL WITH OR SEPARATE FROM THE PHOTOSENSITIVE ELEMENT. THE PHOTOCONDUCTIVE LAYER HAS A THICKNESS SUCH THAT LIGHT PORTIONS OF THE SCREEN IMAGE DO NOT CAUSE SUBSTANTIAL EXCITATION OF THE PHOTOCONDUCTIVE LAYER ON THE SIDE ADJACENT THE INSULATIVE LAYER. A SECOND FIELD IS APPLIED ACROSS THE PHOTOSENSITIVE ELEMENT TO DEPOSIT AN ELECTRIC CHARGE OF POLARITY OPPOSITE TO THE FIRST POLARITY ON THE SURFACE OF THE HIGHLY INSULATIVE LAYER AND A LIGHT IMAGE IS PROJECTED UPON THE PHOTOCONDUCTIVE LAYER THROUGH THE HIGHLY INSULATIVE LAYER CONCURRENTLY WITH THE APPLICATION OF THE SECOND FIELD WHEREBY TO FORM A LATENT IMAGE CORRESPONDING TO THE LIGHT IMAGE ON THE SURFACE OF THE HIGHLY INSULATIVE LAYER.

Inventors

• 👤 H Nagame
• 👤 K Kinoshita
• 👤 S Uehara

Bibliographic Details