US3784300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-transfer station
Assignee: Xerox Corp
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Filing: 1971-12-23
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Granted: 1974-01-08
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Expires: 1991-12-23
Abstract
Abstract A pre-transfer station is provided in a reusable xerographic imaging system. The pre-transfer station includes a pre-transfer corotron and lamp arranged such that the exposure of the system xerographic plate is subsequent and not simultaneous with the pre-transfer corona charging.
Inventors
- 👤 F Hudson
- 👤 J Cranch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/169
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
In an electrostatic reproduction machine having a moving photoconductive surface adapted to be uniformly charged and to carry an electrostatic latent image thereon; a developing means positioned at a development zone to apply toner particles to the latent image and thereby develop the moving electrostatic image on said surface; and a transfer means to transfer the developed image to a receiving member; the improvement comprising: a. a corona discharge device positioned between said developing and transfer means for applying corona emissions on said photoconductive surface; and b. an illuminating device positioned between said corona discharge device and said transfer means for exposing said photoconductive surface, said illuminating device having an intensity sufficient to discharge the photoconductive surface beneath the developed image; c. said corona discharge device and said illuminating device being so constructed and arranged that the exposure of a portion of said photoconductive surface to said corona discharge device will be completed prior to exposure thereof to said illuminating device.
Claim 2
Dependent Claim
161 words
In an electrostatic reproduction machine having a moving photoconductive surface adapted to be uniformly charged and to carry an electrostatic latent image thereon; a developing means positioned at a development zone to apply toner particles to the latent image and thereby develop the moving electrostatic image on said surface; and a transfer means to transfer the developed image to a receiving member; the improvement comprising: a. a corona discharge device positioned between said developing and transfer means for applying corona emissions on said photoconductive surface; and b. an illuminating device positioned between said corona discharge device and said transfer means for exposing said photoconductive surface, said illuminating device having an intensity sufficient to discharge the photoconductive surface beneath the developed image; c. said corona discharge device and said illuminating device being so constructed and arranged that the exposure of a portion of said photoconductive surface to said corona discharge device will be completed prior to exposure thereof to said illuminating device.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said corona discharge device is a D. C. corona discharge device.
Claim 4
Dependent Claim
38 words
The apparatus of claim 1 wherein a baffle is interposed betweeen said corotron discharge device and said illuminating device to shield said portion of said photocontive surface being exposed to said corona discharge device from said illuminating device.
Claim 5
Dependent Claim
31 words
The apparatus of claim 1 wherein said corona discharge device includes a corotron having a shield for limiting corona current to the photoconductive surface within a region defined by the shield.
Claim 6
Dependent Claim
35 words
The apparatus of claim 1 wherein said illuminating device comprises a lamp extending transverse the photoconductive surface having a shield for limiting light exposure of the photoconductive surface within a region defined by the shield.
Claim 7
Dependent Claim
125 words
In an electrostatic reproduction process wherein an electrostatic latent image on a moving photoconductive surface is developed by toner particles in a developing zone, and the developed image is transferred to a receiving member, the improvement comprising the following steps performed after development of the image and prior to the transfer thereof to a receiving member: a. exposing a portion of said photoconductive surface including the developed image to corona emissIons thereby decreasing the range of charged differentials between the image and non-image areas on said photoconductive surface; and b. after exposure of said portion of said photoconductive surface to corona emission is completed, illuminating said photoconductive surface including the developed image with an intensity sufficient to discharge said photoconductive surface beneath said developed image.
Claim 8
Dependent Claim
125 words
In an electrostatic reproduction process wherein an electrostatic latent image on a moving photoconductive surface is developed by toner particles in a developing zone, and the developed image is transferred to a receiving member, the improvement comprising the following steps performed after development of the image and prior to the transfer thereof to a receiving member: a. exposing a portion of said photoconductive surface including the developed image to corona emissIons thereby decreasing the range of charged differentials between the image and non-image areas on said photoconductive surface; and b. after exposure of said portion of said photoconductive surface to corona emission is completed, illuminating said photoconductive surface including the developed image with an intensity sufficient to discharge said photoconductive surface beneath said developed image.
Claim 9
Dependent Claim
45 words
The method as recited in claim 6 wherein the level of corona emissions is so controlled that a charge is deposited onto background areas of the photoconductive surface only and the polarity of the charge associated with toner particles in the background areas is changed.
References Cited (Backward Citations)
US3124457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |