US4218246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electrophotographic recording involving removal of excess developer liquid by corona treatment
Assignee: Canon Inc
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Filing: 1978-01-19
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Granted: 1980-08-19
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Expires: 1998-01-19
Abstract
Abstract A method of transferring images produced by liquid developer in a photographic process which comprises applying a corona charging to a photosensitive member after the development of latent images to increase the attaching force of a toner of the developed image to the photosensitive member and remove the liquid developer and transferring the developed image to a copying web. The corona charging may be applied to the photosensitive member at a point, after development, wherein the angle subtended by a vertical line passing through the center of a drum photosensitive member and a line connecting the center of the drum photosensitive member with the point on the surface of the drum photosensitive member to which the corona charging is applied is not larger than 60°.
Inventors
- 👤 Hiroshi Tanaka
- 👤 Takashi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/169; G03G15/06; G03G15/10; G03G15/11; Y; Y10; Y10S; Y10S430/00; Y10S430/138
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
An electrophotographic recording method utilizing a rotatable drum, formed with a photoconductive layer, on which drum a latent electrophotographic image may be formed, developed with toner and thereafter transferred to a transfer material, comprising the steps of forming a latent electrophotographic image on said drum; then applying liquid developer onto said drum to form a toner image of said latent electrophotographic image, said liquid developer comprising a carrier liquid having toner dispersed therein; thereafter removing, without mechanical intervention, excess liquid from said drum to prevent the flow of the toner image by subjecting said drum to corona discharge of the same polarity as that of the toner, wherein said corona discharge simultaneously acts to increase the attaching force of said toner image to said drum, wherein the longitudinal axis of said drum extends in a horizontal direction and wherein said corona is applied to said drum at a position disposed within an angle less than 60 degrees from a vertical line extending downwardly from the longitudinal axis of said drum and measured in the direction of drum rotation; and thereafter transferring the toner image to transfer material.
Claim 2
Dependent Claim
187 words
An electrophotographic recording method utilizing a rotatable drum, formed with a photoconductive layer, on which drum a latent electrophotographic image may be formed, developed with toner and thereafter transferred to a transfer material, comprising the steps of forming a latent electrophotographic image on said drum; then applying liquid developer onto said drum to form a toner image of said latent electrophotographic image, said liquid developer comprising a carrier liquid having toner dispersed therein; thereafter removing, without mechanical intervention, excess liquid from said drum to prevent the flow of the toner image by subjecting said drum to corona discharge of the same polarity as that of the toner, wherein said corona discharge simultaneously acts to increase the attaching force of said toner image to said drum, wherein the longitudinal axis of said drum extends in a horizontal direction and wherein said corona is applied to said drum at a position disposed within an angle less than 60 degrees from a vertical line extending downwardly from the longitudinal axis of said drum and measured in the direction of drum rotation; and thereafter transferring the toner image to transfer material.
Claim 3
Dependent Claim
25 words
A method according to claim 1, wherein said liquid developer has an electric resistance of from 1×10 10 -5×10 12 Ω·cm for high speed development.
Claim 4
Dependent Claim
17 words
A method according to claim 1, wherein said rotatable drum further includes an outer insulating film layer.
Claim 5
Dependent Claim
122 words
An electrophotographic recording method utilizing an endless rotatable medium, formed with a photoconductive layer, on which a latent electrophotographic image may be formed, developed with toner and thereafter transferred to a transfer material, comprising the steps of forming a latent electrophotographic image on said medium; then applying liquid developer onto said medium to form a toner image, said liquid developer comprising a carrier liquid having toner dispersed therein; thereafter removing excess liquid developer from said medium without mechanical intervention by subjecting said medium to corona discharge of the same polarity as that of the toner, wherein said corona discharge simultaneously acts to increase the attaching force of said toner image to said medium; and thereafter transferring the toner image to transfer material.
Claim 6
Dependent Claim
122 words
An electrophotographic recording method utilizing an endless rotatable medium, formed with a photoconductive layer, on which a latent electrophotographic image may be formed, developed with toner and thereafter transferred to a transfer material, comprising the steps of forming a latent electrophotographic image on said medium; then applying liquid developer onto said medium to form a toner image, said liquid developer comprising a carrier liquid having toner dispersed therein; thereafter removing excess liquid developer from said medium without mechanical intervention by subjecting said medium to corona discharge of the same polarity as that of the toner, wherein said corona discharge simultaneously acts to increase the attaching force of said toner image to said medium; and thereafter transferring the toner image to transfer material.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |