Electrophotographic elements and processes
US4113484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1977 |
| Grant date | Sep 12, 1978 |
| Priority date | — |
| Expiry date | Aug 12, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A positive image is formed by imagewise passing a current through a substantially uniform layer of physically developable catalyst having a coverage of 1 .times. 10.sup.-6 to 1 .times. 10.sup.-10 g/cm.sup.2. The catalytic ability of the catalyst layer is destroyed by subjecting the image areas to greater than 1 .times. 10.sup.-8 coulombs/cm.sup.2. 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 .times. 10.sup.-6 to 1 .times. 10.sup.-10 g/cm.sup.2 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 (3) is sensitive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.