US4692392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color electrophotographic process uses layered photosensitive element having conductive film on side portion
Assignee: Ishihara Sangyo Kaisha Ltd
•
Filing: 1986-06-04
•
Granted: 1987-09-08
•
Expires: 2006-06-04
Abstract
Abstract The present invention aims at materialization of reproduction of an image of high quality by the color electrophotography process of the EF system according to a specific procedure of effecting back surface grounding of a photosensitive material sheet comprising a photosensitive layer consisting of titanium dioxide and a specific base sheet comprising a conductive support constituted by a conductive layer laminated on a highly smooth surface and highly specific resistivity base sheet on the basis of a conductive conveyor.
Inventors
- 👤 Kenichi Ichimura
- 👤 Hiroshi Ichida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03G5/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
163 words
In a color electrophotography process comprising sequentially repeating the imaging steps of supporting photosensitive material sheet on a conductive conveyor, charging said photosensitive material sheet, exposing said charged photosensitive material sheet to an optical image to form an electrostatic latent image, and developing said latent image with a liquid developer to produce a toner image, thereby to superpose multicolor toner images, the improvement wherein said photosensitive material sheet comprises: a base sheet having an extremely smooth surface and high specific resistivity; a conductive layer on one face of said base sheet; a photosensitive coating including titanium dioxide dispersed in an insulating resin on said conductive layer; a conductive film on at least a side edge portion of said photosensitive material sheet and on at least a part of the face of said base sheet opposite said one face, said one face being essentially free of said conductive film, whereby said photosensitive material sheet is grounded, through said conductive layer, to said conductive conveyor.
Claim 2
Dependent Claim
163 words
In a color electrophotography process comprising sequentially repeating the imaging steps of supporting photosensitive material sheet on a conductive conveyor, charging said photosensitive material sheet, exposing said charged photosensitive material sheet to an optical image to form an electrostatic latent image, and developing said latent image with a liquid developer to produce a toner image, thereby to superpose multicolor toner images, the improvement wherein said photosensitive material sheet comprises: a base sheet having an extremely smooth surface and high specific resistivity; a conductive layer on one face of said base sheet; a photosensitive coating including titanium dioxide dispersed in an insulating resin on said conductive layer; a conductive film on at least a side edge portion of said photosensitive material sheet and on at least a part of the face of said base sheet opposite said one face, said one face being essentially free of said conductive film, whereby said photosensitive material sheet is grounded, through said conductive layer, to said conductive conveyor.
Claim 3
Dependent Claim
33 words
A color electrophotography process as claimed in claim 1, wherein said base sheet has a Bekk smoothness of 1,000 sec or more and a specific resistance of 10 13 to 10 15 Ωcm.
Claim 4
Dependent Claim
33 words
A color electrophotography process as claimed in claim 1, wherein said base sheet has a Bekk smoothness of 2,000 sec or more and a specific resistance of 10 13 to 10 15 Ωcm.
Claim 5
Dependent Claim
17 words
A color electrophotography process as claimed in claim 1, wherein said base sheet is a synthetic paper.
Claim 6
Dependent Claim
17 words
A color electrophotography process as claimed in claim 1, wherein said base sheet is a resin film.
Claim 7
Dependent Claim
17 words
A color electrophotography process as claimed in claim 1, wherein said base sheet is a resin-coated paper.
Claim 8
Dependent Claim
21 words
A color electrophotography process as claimed in claim 1, wherein the thickness of said coated conductive film(s) is 3 to 7μ.
Claim 9
Dependent Claim
24 words
A color electrophotography process as claimed in claim 1, wherein the surface resistance of said coated conductive film(s) is 10 8 Ω or less.
Claim 10
Dependent Claim
24 words
A color electrophotography process as claimed in claim 1, wherein the surface resistance of said coated conductive film(s) is 10 5 Ω or less.
Claim 11
Dependent Claim
64 words
A color electrophotography process as claimed in claim 1, wherein said coated conductive film(s) is formed continuously or intermittently in the carrying direction (length-wise direction) of said photosensitive material sheet on one or both side end surfaces in the thickness-wise direction of said photosensitive material sheet and at least in part or on the whole of the back surface of said photosensitive material sheet.
Claim 12
Dependent Claim
58 words
A color electrophotography process as claimed in claim 1 or 10, wherein said coated conductive film(s) is formed continuously in the carrying direction (length-wise direction) of said photosensitive material sheet on one side end surface in the thickness-wise direction of said photosensitive material sheet and in at least part of the back surface of said photosensitive material sheet.
Claim 13
Dependent Claim
58 words
A color electrophotography process as claimed in claim 1 or 10, wherein said coated conductive film(s) is formed continuously in the carrying direction (lengthwise direction) of said photosensitive material sheet on both side end surfaces in the thickness-wise direction of said photosensitive material sheet and in at least part of the back surface of said photosensitive material sheet.
Claim 14
Dependent Claim
29 words
A color electrophotography process as claimed in claim 1, wherein said coated conductive film(s) is formed from a conductive composition comprising a conductivity-imparting substance and a curing resin binder.
Claim 15
Dependent Claim
34 words
A color electrophotography process as claimed in claim 1 or 13, wherein said conductivity-imparting substance is surface-treated titanium oxide or carbon black, and said curing resin binder is an acrylic, petroleum, or polyester resin.
Claim 16
Dependent Claim
28 words
A color electrophotography process as claimed in claim 1, wherein said coated conductive film(s) is formed by a spraying, roller coating, silk screen printing, or brush coating method.
Claim 17
Dependent Claim
93 words
A photosensitive material sheet for use in color electrophotography, said photosensitive material sheet comprising: a base sheet having an extremely smooth surface and high specific resistivity; a conductive layer on one face of said base sheet; a photosensitive coating including titanium dioxide dispersed in an insulating resin on said conductive layer; a conductive film on at least a side edge portion of said photosensitive material sheet and on at least a part of the face of said base sheet opposite said one face, said one face being essentially free of said conductive film.
Claim 18
Dependent Claim
93 words
A photosensitive material sheet for use in color electrophotography, said photosensitive material sheet comprising: a base sheet having an extremely smooth surface and high specific resistivity; a conductive layer on one face of said base sheet; a photosensitive coating including titanium dioxide dispersed in an insulating resin on said conductive layer; a conductive film on at least a side edge portion of said photosensitive material sheet and on at least a part of the face of said base sheet opposite said one face, said one face being essentially free of said conductive film.
References Cited (Backward Citations)
US3138458A
Cited
DE1273325B
Cited
US3783021A
Cited
JPS5778548A
Cited
US4427754A
Cited
FR2517439A1
Cited
US4525441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |