US4207100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of electrostatic latent image
Assignee: Teijin Ltd
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Filing: 1978-05-09
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Granted: 1980-06-10
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Expires: 1998-05-09
Abstract
Abstract Disclosed is a process for forming an electrostatic latent image on a recording element having a dielectric layer superposed on a conductive electrode. In the first step of this process, the recording element and a xerographic sensitive element having a photoconductive layer also superposed on a conductive electrode are charged with the same polarity. In the second step, the photosensitive element is brought into virtual contact with the recording element so that the charged surface of the photoconductive layer in the photosensitive element is in face-to-face relationship with the charged surface of the dielectric layer in the recording element. In the third step, an external voltage is imposed between the two conductive electrodes, said voltage being of at least a magnitude for producing an electric field causing breakdown of minute air-gaps present between the contacted surfaces of the photosensitive element and the recording element and, before the completion of the external voltage imposition, an optical image is projected onto the photoconductive layer in the photosensitive element.
Inventors
- 👤 Sadao Kadokura
- 👤 Kazuhiko Honjo
- 👤 Kazuhiro Kamei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G13/00; G03G13/22; G03G13/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A process for forming an electrostatic latent image on a recording element having a dielectric layer superposed on a conductive electrode, which comprises the steps of: charging with the same polarity the recording element and a xerographic sensitive element having a photoconductive layer superposed on a conductive electrode; bringing the photosensitive element in virtual contact with the recording element so that the charged surface of the photoconductive layer in the photosensitive element is in face-to-face relationship with the charged surface of the dielectric layer in the recording element; and then, imposing an external voltage between the two conductive electrodes, said voltage having a polarity to produce a charge on the conductive electrode on which the photoconductive layer is superposed which is opposite to the polarity of the charge on the photoconductive layer, and being of at least a magnitude sufficient for producing an electric field causing break down of air-gaps present between the contacted surfaces of the photosensitive element and the recording element, and simultaneously with or prior to the external voltage imposition, projecting an optical image onto the photoconductive layer in the photosensitive element.
Claim 2
Dependent Claim
185 words
A process for forming an electrostatic latent image on a recording element having a dielectric layer superposed on a conductive electrode, which comprises the steps of: charging with the same polarity the recording element and a xerographic sensitive element having a photoconductive layer superposed on a conductive electrode; bringing the photosensitive element in virtual contact with the recording element so that the charged surface of the photoconductive layer in the photosensitive element is in face-to-face relationship with the charged surface of the dielectric layer in the recording element; and then, imposing an external voltage between the two conductive electrodes, said voltage having a polarity to produce a charge on the conductive electrode on which the photoconductive layer is superposed which is opposite to the polarity of the charge on the photoconductive layer, and being of at least a magnitude sufficient for producing an electric field causing break down of air-gaps present between the contacted surfaces of the photosensitive element and the recording element, and simultaneously with or prior to the external voltage imposition, projecting an optical image onto the photoconductive layer in the photosensitive element.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the electrostatic latent image is such that the image area and the background area have potentials with different polarity.
Claim 4
Dependent Claim
34 words
A process according to claim 1 or 2 wherein the recording element, charged with the same polarity as that of the photosensitive element, has a charge voltage larger than that of the photosensitive element.
Claim 5
Dependent Claim
27 words
A process according to claim 1 or 2 wherein at least one step of the external voltage imposition and the optical image projection is intermittently carried out.
Claim 6
Dependent Claim
38 words
A process according to claim 1 or 2 wherein, after the optical image projection, the potentials of the two conductive electrode layers are made into the same, and then, the recording element is separated from the photosensitive element.
Claim 7
Dependent Claim
38 words
A process according to claim 1 or 2 wherein the photosensitive element is brought into virtual contact with the recording element in a way such that an insulating liquid lies between the confronting surfaces of the two elements.
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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |