Patent US3697169A successfully refreshed from Google Patents.
US3697169A
Expired / Lapsed
US
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Electrostatic recording apparatus and method
Assignee: Xerox Corp
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Filing: 1971-01-06
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Granted: 1972-10-10
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Expires: 1991-01-06
Abstract
Abstract An electrostatic copying device including a donor roller for supplying a layer of toner and a photoreceptor drum and associated components for generating a latent image are operated in consort in a two-rotation cycle of operation under controlled condition. During the first rotation of the cycle of operation the photoreceptor is uniformly charged with a relatively low corona charge and the photoreceptor is used as a biased roller to make uniform the layer of toner placed on the donor roller. During the second rotation of the cycle of operation the latent image is generated and the latent image is developed using the uniformly made toner layer.
Inventors
- 👤 John Maksymiak
- 👤 Kenneth M Beach Jr
- 👤 James W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/081; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
25 words
An electrostatic recording apparatus as in claim 1 and further including means for transferring said visible image to a substrate for preserving said visible image.
Claim 2
Dependent Claim
28 words
An electrostatic recording apparatus as in claim 1 and in which said second power level of electrostatic charge is substantially greater iN magnitude than said first power level.
Claim 3
Dependent Claim
36 words
An electrostatic recording apparatus as in claim 1 and in which said first power level is substantially 70 to 100 volts direct current, and said second power level is substantially 400 to 500 volts direct current.
Claim 4
Dependent Claim
36 words
An electrostatic recording apparatus as in claim 1 and further including means for sensing when the corresponding parts of said photoreceptor means surface and said toner layer bearing means surface have been brought into close proximity.
Claim 5
Dependent Claim
269 words
An electrostatic recording apparatus including a photoreceptor drum and a donor roller each rotated uniformly and operating in a two rotation cycle of operation for generating a uniform layer of toner on the donor roller during the first rotation of the cycle and during the second rotation for generating a latent image and developing the latent image into a visible image employing the uniform layer of toner generated on the donor roller during the first rotation of the cycle of operation, said electrostatic recording apparatus including means for rotating said photoreceptor drum and said donor roller uniformly at the same speed of rotation, control means responsive to rotation of the rotating members for providing a first output for controlling one phase of the cycle of operation and for providing a second output for controlling the other phase of the cycle of operation, means for supplying toner to the surface of said donor roller for generating a layer of toner on the surface of said roller during said one phase of the cycle of operation, and means for generating an electrostatic charge of first magnitude during said one phase and for distributing said electrostatic charge on the surface of said photoreceptor so that as said photoreceptor drum and said donor roller rotate during said one phase the surface having said electrostatic charge of first magnitude will pass over the surface having said layer of toner and predetermined portions of toner from said layer of toner will be captured by said electrostatic charge of first magnitude and thereby create a uniform layer of toner on the surface of the donor roller.
Claim 6
Dependent Claim
32 words
An electrostatic recording apparatus as in claim 6 and further including means for cleaning the toner so captured by the electrostatic charge of first magnitude from the surface of the photoreceptor drum.
Claim 7
Dependent Claim
87 words
An electrostatic recording apparatus as in claim 6 and further including means for generating an electrostatic charge of second magnitude during said other phase of said cycle of operation and for distributing said electrostatic charge on the surface of said photoreceptor, means for illuminating the surface of said photoreceptor having said electrostatic charge of said second magnitude with a predetermined pattern for selectively dissipating the charges of said second magnitude for forming a latent image on said surface of said photoreceptor drum in accordance with such illumination.
Claim 8
Dependent Claim
56 words
An electrostatic recording apparatus as in claim 8 and in which said photoreceptor drum and said donor roller are positioned so that a portion of the surface of each are in close proximity and the said latent image is developed into a visible image as the photoreceptor drum and the donor roller rotate past each other.
Claim 9
Dependent Claim
45 words
An electrostatic recording apparatus as in claim 9 and further including substrate means selectively operated during said other phase of said cycle of operation for effectively transferring said visible image from the surface of said photoreceptor drum to a substrate for forming a permanent record.
Claim 10
Independent Claim
255 words
The method of making an electrostatic copy of a desired pattern employing a photoreceptor means and a toner-donor means in which the photoreceptor means and the toner-donor means are sequenced through a cycle of operation including the steps of: loading the surface of the toner-donor means with a layer of toner, depositing a relatively low powEr electrostatic charge on the surface of the photoreceptor means, bringing the surface of the toner-donor means with said layer and the surface of the photoreceptor means with said relatively low power electrostatic charge in sufficiently close proximity to each other so that the ununiform portions of the layer of toner on the toner-donor means will be captured by the low power electrostatic charge on the photoreceptor means to provide a uniform layer of toner on the surface of the toner-donor means, depositing a relatively high power electrostatic charge on the surface of the photoreceptor means, illuminating the surface of the photoreceptor having the high power electrostatic charge with a desired pattern for forming a latent image on the surface of the photoreceptor means bringing the surface of the toner-donor means with the uniform layer of toner and the surface of the photoreceptor means with the latent image in sufficiently close proximity to each other to capture toner from the uniform layer in accordance with the electrostatic charges on the surface of the photoreceptor means for developing the latent image into a visible image and transferring the visible image onto a substrate for making a copy of the desired pattern.
Claim 11
Independent Claim
229 words
A method of making an electrostatic copy of a desired pattern employing a photoreceptor drum and a toner-donor roller in which the photoreceptor drum serves as a biased roller for smoothing out a layer of toner on the toner-donor roller and then serves as a photoreceptor on which an electrostatic latent image is generated and the latent image is developed with the smoothed layer of toner on the surface of the toner-donor roller including the steps of: rotating the photoreceptor drum and the toner-donor roller about their respective axis in a two rotation cycle of operation, loading toner onto the surface of the toner-donor roller during the first rotation, placing a low corona charge on the surface of the photoreceptor drum during the first rotation, rotating the toner loaded surface and the low corona charged surface past each other so that the low corona charged surface captures non-uniform portions of toner on the layer of toner and forms a uniform layer of toner, cleaning the toner so captured by the low corona charged surface, placing a relatively high corona charge on the surface of the photoreceptor drum during the second rotation, illuminating the high corona charged surface with a desired pattern to form a latent image during the second rotation, and developing the latent image into a visible image with the uniform layer of toner during the second rotation.
Claim 12
Dependent Claim
51 words
A method of making an electrostatic copy of a desired pattern as in claim 12 and further including the steps of: transferring the developed image onto a substrate to preserve the visible pattern during the second rotation, and cleaning the surface of the photoreceptor drum of all remaining toner after transfer.
Claim 13
Dependent Claim
275 words
In an electrostatic recording device for creating a copy of a predetermined pattern employing a photoreceptor surface for forming an electrostatic latent image and developing the latent image by presenting a layer of toner to the surface bearing the latent image by using a toner donor surface, the electrostatic recording device operating in a two-phase cycle of operation said device including means for generating a uniform electrostatic charge on the surface of the photoreceptor of a first magnitude during the first phase of the cycle of operation, means for loading a layer of toner on the surface of the toner donor during the first phase of the cycle of operation, means for bringing the surface of the photoreceptor having the uniform electrostatic charge thereon adjacent the surface of the toner-donor having the layer of toner thereon during the first phase of the cycle of operation, means for generating an electrostatic charge latent image of the predetermined pattern oN the surface of the photoreceptor during the second phase of the cycle of operation, said means for bringing said surfaces adjacent one another also bringing the surface of the photoreceptor having the electrostatic latent image thereon adjacent the toner-donor surface having the layer of toner thereon during the second phase of the cycle of operation for developing the latent image and cyclic control means enabling the charged photoreceptor surface to remove excess toner from the layer on the toner-donor surface during the first phase of the cycle of operation and for enabling said latent image generating means to generate a latent image on the surface of the photoreceptor during the second phase of the cycle of operations.
Claim 14
Dependent Claim
79 words
In an electrostatic recording device as in claim 14 and in which the means for generating a uniform electrostatic charge on the surface of the photoreceptor of a first magnitude includes a corotron for generating a corona charge and distributing said corona charge over the surface of said photoreceptor, and means for illuminating the entire surface of said photoreceptor so charged for uniformly reducing the level of the charge on the surface of the photoreceptor to said first magnitude.
Claim 15
Dependent Claim
42 words
In an electrostatic recording device as in claim 14 and in which the means for generating an electrostatic charge on the surface of the photoreceptor of a first magnitude includes a first corotron for generating a corona charge of said first magnitude.
Claim 16
Dependent Claim
268 words
In an electrostatic recording device for creating a copy of a predetermined pattern employing a photoreceptor surface for forming an electrostatic latent image and developing the latent image by presenting a layer of toner to the surface bearing the latent image by using a toner-donor surface, the electrostatic recording device operating in a two-phase cycle of operation, said device including a first corotron for generating an electrostatic corona charge and for uniformly distributing a charge of first magnitude on the surface of the photoreceptor during the first phase of the cycle of operation, means for loading a layer of toner on the toner-donor surface during the first phase of the cycle of operation, means for bringing the surface of the photoreceptor having the uniform charge thereon adjacent the toner-donor surface having the layer of toner thereon during the first phase of the cycle of operation, and means for generating an electrostatic charge latent image of the predetermined pattern on the surface of the photoreceptor during the second phase of the cycle of operation including a second corotron for generating an electrostatic corona charge and for distributing a charge of second magnitude on the surface of the photoreceptor and means for illuminating the surface so charged with a pattern of light for selectively dissipating the charge of second magnitude for forming said latent image. said means for bringing said surfaces adjacent one another also bringing the surface of the photoreceptor having the latent image thereon adjacent the toner-donor surface having the layer of toner thereon during the second phase of the cycle of operation to develop the latent image.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |