Claims
- 1. An electrophotographic process for forming a latent image comprising the steps of applying a primary charge to an electrophotographic photosensitive member comprising an electrically conductive base layer, an intermediate layer superposed on said conductive base layer, a layer of photoconductive material superposed on and having a thickness greater than said intermediate layer and an insulating layer superposed on said photoconductive layer, said primary charging step being performed by applying a negative charge to said insulating layer when said photoconductive layer comprises a p-type material and by applying a positive charge to said insulating layer when said photoconductive layer comprises an n-type material so that an electrical charge from said base is bound at the interface of said photoconductive layer and said insulating layer; subjecting said photosensitive member to corona charging of a polarity opposite to that of the primary charge or to AC discharging contemporaneously with imagewise exposure; and then subjecting said photosensitive member to blanket irradiation to increase the electrostatic contrast and form an electrostatic latent image of high contrast on said insulating layer;
- wherein said intermediate layer has a greater p-type concentration than said photoconductive layer when said photoconductive layer comprises an p-type material, and a greater n-type concentration than said photoconductive layer when said photoconductive layer comprises an n-type material, to facilitate the injection of an electric charge from said base to said photoconductive layer.
- 2. A process according to claim 1, wherein said photoconductive layer comprises an Se-Te alloy containing up to about 15% Te.
- 3. A process according to claim 1, wherein said photoconductive layer is composed of an amorphous Se-Te alloy containing up to about 15% Te, and wherein said intermediate layer is composed of a crystallized Se-Te alloy containing up to about 15% Te.
- 4. A process according to claim 1, wherein said photoconductive layer is composed of an Se-Te alloy and wherein said intermediate layer is composed of a member selected from the group consisting of Ni, Ge, Pt, Se and an Se-Te alloy.
Priority Claims (3)
Number |
Date |
Country |
Kind |
44-90312 |
Nov 1969 |
JPX |
|
44-92335 |
Nov 1969 |
JPX |
|
44-95296 |
Nov 1969 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 755,026 filed Dec. 29, 1976, now abandoned, which in turn is a continuation of Ser. No. 419,043 filed Nov. 26, 1973, now abandoned, which in turn is a continuation of Ser. No. 87,425 filed Nov. 6, 1970, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
38-14895 |
Aug 1963 |
JPX |
38-17247 |
Sep 1963 |
JPX |
38-20697 |
Oct 1963 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Dessauer et al., Xerography, 1965, pp. 96-97. |
Claus, "Advances in Xerography", Photog. Sci & Eng. vol. 7, No. 1, Jan.-Feb. 1963., pp. 5-14. |
Keck, "Photoconductivity in Vacuum Coated Selenium Films", J. Opt. Soc. of Amer. vol. 42, No. 4, Apr. 1952, pp. 221-225. |
Continuations (3)
|
Number |
Date |
Country |
Parent |
755026 |
Dec 1976 |
|
Parent |
419043 |
Nov 1973 |
|
Parent |
87425 |
Nov 1970 |
|