US3877934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction imaging with in-place development
Assignee: Xerox Corp
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Filing: 1973-08-29
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Granted: 1975-04-15
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Expires: 1993-08-29
Abstract
Abstract A process for image reproduction comprises the steps of contacting a charge blocking surface on a photoreceptive body with a developer material containing charged toner particles, providing an electric field of predetermined polarity between the photoreceptor and a transfer medium for attracting the toner particles toward the photoreceptor surface, subjecting the photoreceptor to activating radiation in image configuration for inducing an electrostatic charge pattern in image configuration on the photoreceptor near an interface between the blocking layer and the developer material and providing an electric field of opposite polarity between the photoreceptor and the transfer medium for transferring the toner particles in image configuration to the transfer medium. Automated copying apparatus and photographic apparatus in accordance with features of the invention are provided.
Inventors
- 👤 Fred W Schmidlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:38
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04; G03G15/00; G03G15/22; G03G15/34; G03G15/344; G03G2217/00; G03G2217/0091
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
A METHOD OF IMAGE REPRODUCTION COMPRISING THE STEPS OF: DEPOSITING A DEVELOPER MATERIAL COMPRISING ELECTRICALLY CHARGED TONER PARTICLES DISPERSED IN AN INSULATING LIQUID BETWEEN AN ELECTRIC CHARGE TRANSFER BLOCKING MEANS, WHICH IS POSITIONED ADJACENT A SURFACE OF A PHOTOCONDUCTOR BODY, AND AND IMAGE TRANSFER MEDIUM; ESTABLISHING AN ELECTRIC FIELD OF PERDETERMINED POLARITY BETWEEN SAID PHOTOCONDUCTOR AND SAID TRANSFER MEDIUM FOR EXERTING AN ELECTROSATIC FORCE ON SAID CHARGED PARTICLES AND CAUSING SAID PRATICLES TO UNIFORMLY MIGRATE TOWARD SAID PHOTOCONDUCTOR, SUBJECTING SAID PHOTOCONDUCTOR TO ACTIVATING ELECTROMAGNETIC RADIATION IN IMAGE CONFIGURATION TO INCREASE THE ELECTROSTATIC FORCE EXERTED ON SAID PARTICLES ADJACENT LIGHT STRUCT AREAS OF SAID PHOTOCONDUCTOR, AND ESTABLISHING BETWEEN SAID PHOTOCONDUCTOR AND TRANSFER MEDIUM AN ELECTRIC FIELD OF OPPOSITE POLARITY AND HAVING A MAGNITUDE FOR CAUSING THE TRANSFER OF PARTICLES CORRESPONDING TO NON-LIGHT STRUCK AREAS OF SAID PHOTOCONDUCTOR TO TRANSFER IN IMAGE CONFIGURATION TO SAID TRANSFER MEDIUM TO FORM AN IMAGE THEREON, SAID MAGNITUDE BEING INSUFFICIENT TO REMOVE PARTICLES CORRESPONDING TO LIGHT STRUCK AREAS OF SAID PHOTOCONDUCTOR THEREBY PROVIDING AN IMAGE ON SAID CHARGE BLOCKING MEANS FORMED BY SAID TRANSFER OF PARTICLES IN NON-LIGHT STRUCK AREAS.
Claim 2
Independent Claim
184 words
A METHOD OF IMAGE REPRODUCTION COMPRISING THE STEPS OF: DEPOSITING A DEVELOPER MATERIAL COMPRISING ELECTRICALLY CHARGED TONER PARTICLES DISPERSED IN AN INSULATING LIQUID BETWEEN AN ELECTRIC CHARGE TRANSFER BLOCKING MEANS, WHICH IS POSITIONED ADJACENT A SURFACE OF A PHOTOCONDUCTOR BODY, AND AND IMAGE TRANSFER MEDIUM; ESTABLISHING AN ELECTRIC FIELD OF PERDETERMINED POLARITY BETWEEN SAID PHOTOCONDUCTOR AND SAID TRANSFER MEDIUM FOR EXERTING AN ELECTROSATIC FORCE ON SAID CHARGED PARTICLES AND CAUSING SAID PRATICLES TO UNIFORMLY MIGRATE TOWARD SAID PHOTOCONDUCTOR, SUBJECTING SAID PHOTOCONDUCTOR TO ACTIVATING ELECTROMAGNETIC RADIATION IN IMAGE CONFIGURATION TO INCREASE THE ELECTROSTATIC FORCE EXERTED ON SAID PARTICLES ADJACENT LIGHT STRUCT AREAS OF SAID PHOTOCONDUCTOR, AND ESTABLISHING BETWEEN SAID PHOTOCONDUCTOR AND TRANSFER MEDIUM AN ELECTRIC FIELD OF OPPOSITE POLARITY AND HAVING A MAGNITUDE FOR CAUSING THE TRANSFER OF PARTICLES CORRESPONDING TO NON-LIGHT STRUCK AREAS OF SAID PHOTOCONDUCTOR TO TRANSFER IN IMAGE CONFIGURATION TO SAID TRANSFER MEDIUM TO FORM AN IMAGE THEREON, SAID MAGNITUDE BEING INSUFFICIENT TO REMOVE PARTICLES CORRESPONDING TO LIGHT STRUCK AREAS OF SAID PHOTOCONDUCTOR THEREBY PROVIDING AN IMAGE ON SAID CHARGE BLOCKING MEANS FORMED BY SAID TRANSFER OF PARTICLES IN NON-LIGHT STRUCK AREAS.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said toner particles and insulating liquid are selected for trioboelectrically establishing a resultant electrical charge of predetermined polarity on said toner particles.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said transfer medium comprises a record medium.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said electric charge blocking means comprises charge traps integrally formed in a surface of said photoconductor body.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said electric charge blocking means comprises a thin film of electrically insulating material positioned adjacent a surface of said photoconductor.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said electric fields are provided by coupling a source of potential between said photoconductor and said record medium.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein said electric field of predetermined polarity is provided by establishing a uniform electric charge at a surface of the photoconductor.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein said charge is established on said photoconductor surface of corona charging.
Claim 10
Dependent Claim
36 words
The method of claim 1 wherein said charge is established on said photoconductor surface by subjecting said photoconductor to uniform activating electromagnetic radiation and simultaneously establishing an electric field between said photoconductor and said record medium.
Claim 11
Dependent Claim
38 words
The method of claim 1 wherein said photoconductor surface comprises a thin film formed on a transport body which travels in contact with a second transport body, and said developing material is applied to said second transport body.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |