| 摘要 |
<p>A positive image is formed by imagewise passing a current through a substantially uniform layer of physically developable catalyst having a coverage of 1 x 10-6 to 1 x 10-10 g/cm2. The catalytic ability of the catalyst layer is destroyed by subjecting the image areas to greater than 1 x 10-8 coulombs/cm2. Physical development of the thus exposed catalyst layer produces the positive image. A photoconductive element which is useful in this process is also disclosed. This photographic element comprises: 1) a non-catalytic conductive support; 2) a substantially uniform first layer coated on the conductive support comprising a physically developable catalyst having a coverage of 1 x 10-6 to 1 x 10-10 g/cm2 of support; 3) a photoconductive second layer separated from the first layer by an air gap of up to 20 microns; and 4) a conductive layer over the second layer wherein at least the conductive support 1) or the conductive layer 4) is transparent to the electromagnetic radiation to which the photoconductive second layer ) is sensitive.</p> |
