US5002845A
Expired / Lapsed
US
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Electrophotographic image forming member and method and apparatus for transferring electrophotographic images formed on the member
Assignee: Seiko Epson Corp
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Filing: 1988-09-20
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Granted: 1991-03-26
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Expires: 2008-09-20
Abstract
Abstract An electrophotographic image forming member for forming color images including an organic photosensitive layer sandwiched between a dielectric layer and a conductive layer. The photoconductive layer includes a first charge generation layer adjacent to the conductive layer, a charge transfer layer on the first charge generation layer and a second charge generation layer on the charge transfer layer. During exposure, resistance of the photosensitive layer is reduced so that charges can flow through the photosensitive layer to create oppositely charged portions of the image forming member corresponding to a desired image of each color. Appropriately charged color toner adheres to the surface of the image forming member in the form of the desired image. After each color toner image is formed, the completed color image is transferred to a transfer medium.
Inventors
- 👤 Hidetsugu Shimura
- 👤 Hiroshi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:18
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/078; G03G5/043; G03G5/047; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
120 words
An electrophotographic image forming member comprising: a conductive base layer; an organic photosensitive layer disposed on the conductive layer, the photosensitive layer formed of a first charge generation layer adjacent to the conductive layer, a charge transportation layer disposed on the first charge generation layer and a second charge generation layer disposed on the charge transportation layer; a dielectric layer disposed on the photosensitive layer; and including at least one of a first intermediate layer positioned intermediate the conductive layer and the first charge generation layer and a second intermediate layer positioned intermediate the charge transportation layer and the second charge generation layer, wherein the at least one intermediate layer limits the movement of charges within the image forming member.
Claim 2
Dependent Claim
120 words
An electrophotographic image forming member comprising: a conductive base layer; an organic photosensitive layer disposed on the conductive layer, the photosensitive layer formed of a first charge generation layer adjacent to the conductive layer, a charge transportation layer disposed on the first charge generation layer and a second charge generation layer disposed on the charge transportation layer; a dielectric layer disposed on the photosensitive layer; and including at least one of a first intermediate layer positioned intermediate the conductive layer and the first charge generation layer and a second intermediate layer positioned intermediate the charge transportation layer and the second charge generation layer, wherein the at least one intermediate layer limits the movement of charges within the image forming member.
Claim 3
Dependent Claim
34 words
The electrophotographic image forming member of claim 1, wherein the first charge generation layer and the second charge generation layer each include at least one binder resin and at least one colorant admixed therein.
Claim 4
Dependent Claim
33 words
The electrophotographic image forming member of claim 2, wherein the colorant is selected from the group consisting of β-type copper phthalocyanine, x-type metal free phthalocyanine, α-type quinacridone and rhodamine B and combinations thereof.
Claim 5
Dependent Claim
62 words
The electrophotographic image forming member of claim 1, wherein the charge transportation layer includes a least one charge moving agent selected from the group consisting of high molecular weight polyvinyl carbazole, poly(methylphenyl)silicone, poly(propylphenyl)silicone and a binder resin admixed with at least one compound selected from the group consisting of hydrazones, triphenylmethane, carbazoles, oxazoles, oxadiazoles, benzidine, stilbene, pyrazoline, triallyl amine and mixtures thereof.
Claim 6
Dependent Claim
36 words
The electrophotographic image forming member of claim 1, wherein the charge transportation layer includes a binder and at least one charge moving agent selected from the group consisting of tetraphenyl diaminodiphenyl and diphenyl hydrazone admixed therein.
Claim 7
Dependent Claim
32 words
The electrophotographic image forming member of claim 1, wherein the at least one intermediate layer is formed of a binder resin selected from the group consisting of thermoplastic resins and thermosetting resins.
Claim 8
Dependent Claim
41 words
The electrophotographic image forming member of claim 1, wherein the intermediate layer is selected from the group consisting of polyvinyl pyrrolidone, polystyrene, casein sodium, polyacrylonitrile containing cupric sulfide, polyvinyl butyral resin, nylon and polycarbonate resin containing tetraphenyl diaminostilbene and combinations thereof.
Claim 9
Dependent Claim
47 words
The electrophotographic image forming member of claim 1, wherein the conductive base layer is selected from the group consisting of a conductive metal, a resin having a conductive metal powder dispersed therein, a conductive salt, a conductive metal oxide, a conductive metal sulfide and a conductive polymer.
Claim 10
Dependent Claim
27 words
The electrophotographic image forming member of claim 1, wherein the dielectric layer consists essentially of at least one of oxides and nitrides dispersed in a binder resin.
Claim 11
Dependent Claim
17 words
The electrophotographic image forming member of claim 1, wherein the dielectric layer is about 20 μm thick.
Claim 12
Dependent Claim
91 words
An electrophotographic image forming member, comprising: a conductive base layer; an organic photosensitive layer disposed on the conductive layer, the photosensitive layer formed of a first charge generation layer adjacent to the conductive layer, a charge transportation layer disposed on the first charge generation layer and a second charge generation layer disposed on the charge transportation layer; a dielectric layer disposed on the photosensitive layer; and the charge transportation layer including at least one charge moving agent selected from the group consisting of high molecular weight poly(methylphenyl) silicone and poly(propylphenyl) silicone.
Claim 13
Dependent Claim
91 words
An electrophotographic image forming member, comprising: a conductive base layer; an organic photosensitive layer disposed on the conductive layer, the photosensitive layer formed of a first charge generation layer adjacent to the conductive layer, a charge transportation layer disposed on the first charge generation layer and a second charge generation layer disposed on the charge transportation layer; a dielectric layer disposed on the photosensitive layer; and the charge transportation layer including at least one charge moving agent selected from the group consisting of high molecular weight poly(methylphenyl) silicone and poly(propylphenyl) silicone.
Claim 14
Dependent Claim
111 words
An electrophotographic image forming member, comprising: a conductive base layer; an organic photosensitive layer disposed on the conductive layer, the photosensitive layer formed of a first charge generation layer adjacent to the conductive layer, a charge transportation layer disposed on the first charge generation layer and a second charge generation layer disposed on the charge transportation layer; a dielectric layer disposed on the photosensitive layer; and a first charge is present at a first portion of the surface of the dielectric layer and an opposite charge is present at a portion of the intersection of the dielectric layer and the second charge generation layer at a position opposite the first portion.
Claim 15
Dependent Claim
111 words
An electrophotographic image forming member, comprising: a conductive base layer; an organic photosensitive layer disposed on the conductive layer, the photosensitive layer formed of a first charge generation layer adjacent to the conductive layer, a charge transportation layer disposed on the first charge generation layer and a second charge generation layer disposed on the charge transportation layer; a dielectric layer disposed on the photosensitive layer; and a first charge is present at a first portion of the surface of the dielectric layer and an opposite charge is present at a portion of the intersection of the dielectric layer and the second charge generation layer at a position opposite the first portion.
Claim 16
Dependent Claim
27 words
The electrophotographic image forming member of claim 12, wherein portions of the surface of the dielectric layer are charged oppositely than the charge of the first portion.
Claim 17
Dependent Claim
34 words
The electrophotographic image forming member of claim 12, wherein the first charge generation layer and the second charge generation layer each include at least one binder resin and at least one colorant admixed therein.
Claim 18
Dependent Claim
33 words
The electrophotographic image forming member of claim 14, wherein the colorant is selected from the group consisting of β-type copper phthalocyanine, x-type metal free phthalocyanine, γ-type quinacridone and rhodamine B and combinations thereof.
Claim 19
Dependent Claim
63 words
The electrophotographic image forming member of claim 12, wherein the charge transportation layer includes at least one charge moving agent selected from the group consisting of high molecular weight polyvinylcarbazole, poly(methylphenyl) silicone poly(propylphenyl) silicone and a binder resin admixed with at least one compound selected from the group consisting of hydrazones, triphenylmethane, carbazoles, oxazoles, oxadiazoles, benzidine, stilbene, pyrazoline, triallyl amine and mixtures thereof.
Claim 20
Dependent Claim
63 words
The electrophotographic image forming member of claim 12, further including at least one of a first intermediate layer positioned intermediate the conductive layer and the first charge generation layer and a second intermediate layer positioned intermediate the charge transportation layer and the second charge generation layer, wherein the at least one intermediate layer limits the movement of charges within the image forming member.
Claim 21
Dependent Claim
47 words
The electrophotographic image forming member of claim 13, wherein the conductive base layer is selected from the group consisting of a conductive metal, a resin having a conductive metal powder dispersed therein, a conductive salt, a conductive metal oxide, a conductive metal sulfide and a conductive polymer.
Claim 22
Dependent Claim
22 words
The electrophotographic image forming member of claim 12, wherein the dielectric layer consists essentially of oxides and nitrides dispersed in a binder.
Claim 23
Dependent Claim
17 words
The electrophotographic image forming member of claim 12, wherein the dielectric layer is about 20 mm thick.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |