US4600668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process
Assignee: Kyocera Mita Industrial Co Ltd
•
Filing: 1985-05-29
•
Granted: 1986-07-15
•
Expires: 2005-05-29
Abstract
Abstract In the electrophotographic process in which an image is formed by performing imagewise light exposure, toner development, toner image transfer and cleaning after charging a photoconductive photosensitive layer by direct current corona discharge, an organic photoconductive photosensitive layer in which the surface potential is saturated at 500 to 700 volts as the absolute value is used as the photosensitive layer and charging is carried out at an injection current which becomes saturated at said surface potential. According to this process, good images can be stably obtained irrespectively of environmental changes or even if the cycle number of the copying operation is increased.
Inventors
- 👤 Toru Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:35
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
An electrophotographic process in which an image is formed by performing imagewise light exposure, toner development, toner image transfer and cleaning after charging a photoconductive photosensitive layer by direct current corona discharge, said process being characterized in that an organic photoconductive photosensitive layer in which the surface potential is saturated at 500 to 700 volts as the absolute value is used as the photosensitive layer and charging is carried out at an injection current which becomes saturated at said surface potential.
Claim 2
Dependent Claim
81 words
An electrophotographic process in which an image is formed by performing imagewise light exposure, toner development, toner image transfer and cleaning after charging a photoconductive photosensitive layer by direct current corona discharge, said process being characterized in that an organic photoconductive photosensitive layer in which the surface potential is saturated at 500 to 700 volts as the absolute value is used as the photosensitive layer and charging is carried out at an injection current which becomes saturated at said surface potential.
Claim 3
Dependent Claim
24 words
An electrophotographic process according to claim 1, wherein the surface potential of the organic photoconductive photosensitive layer is saturated at 550 to 650 volts.
Claim 4
Dependent Claim
44 words
An electrophotographic process according to claim 1, wherein the organic photoconductive photosensitive layer is a layer composed of a dispersion of a charge-generating pigment in a charge-transporting resin or a binder resin containing therein a charge-transporting substance, which is formed on an electroconductive substrate.
Claim 5
Dependent Claim
21 words
An electrophotographic process according to claim 1, wherein the thickness of the organic photoconductive photosensitive layer is 8 to 18 μm.
Claim 6
Dependent Claim
34 words
An electrophotographic process according to claim 1, wherein the injection current is set so that when the injection current is reduced by 25%, the reduction ratio of the surface potential is lower than 10%.
References Cited (Backward Citations)
US3944332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |