Patent US4001014A successfully refreshed from Google Patents.
US4001014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photosensitive plate having tellurium present in varying concentrations across its thickness
Assignee: Panasonic Holdings Corp
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Filing: 1974-09-12
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Granted: 1977-01-04
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Expires: 1994-09-12
Abstract
Abstract An electrophotographic photosensitive plate having, in order from the bottom up, an electrically conductive substrate, a photosensitizing layer composed of vitreous selenium and tellurium having a thickness of 0.1 to 3 microns, and a top organic layer including polyvinyl carbazole or a derivative thereof, the photosensitizing layer being composed of a first layer of 0.05 to 2 microns in thickness having 60 to 90 weight % of selenium and 40 to 10 weight % of tellurium and a second layer of 0.05 to 1 micron in thickness having a higher concentration of selenium than that of the first layer, and the second layer being positioned between the first layer and the top organic layer. This invention also provides a process of producing a latent electrostatic image on the plate by providing a negative electrostatic charge thereon and exposing the plate to a light image of visible light having a wavelength in the range of 4000 to 8000A. Advantages of this electrophotographic plate are that it has high sensitivity to the visible light along with low residual potential.
Inventors
- 👤 Eiji Ando
- 👤 Yoshiki Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:22
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/0436
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
An electrophotographic photosensitive plate comprising, in order from the bottom up, an electrically conducting substrate, a photosensitizing layer comprising vitreous selenium and tellurium and having a thickness of 0.1 to 3 microns, and a top layer comprising a member selected from the group consisting of polyvinylcarbazole and derivatives thereof, said photosensitizing layer being composed of a first layer part 0.05 to 2 microns in thickness having 60 to 90 weight % of selenium and 40 to 10 weight % of tellurium and a second layer part 0.05 to 1 micron in thickness having a higher concentration of selenium than that of said first layer part, and said second layer part being positioned between said first layer part and said top layer.
Claim 2
Dependent Claim
121 words
An electrophotographic photosensitive plate comprising, in order from the bottom up, an electrically conducting substrate, a photosensitizing layer comprising vitreous selenium and tellurium and having a thickness of 0.1 to 3 microns, and a top layer comprising a member selected from the group consisting of polyvinylcarbazole and derivatives thereof, said photosensitizing layer being composed of a first layer part 0.05 to 2 microns in thickness having 60 to 90 weight % of selenium and 40 to 10 weight % of tellurium and a second layer part 0.05 to 1 micron in thickness having a higher concentration of selenium than that of said first layer part, and said second layer part being positioned between said first layer part and said top layer.
Claim 3
Dependent Claim
32 words
An electrophotographic plate according to claim 1, wherein said first layer part of said photosensitizing layer comprises 75 to 85 weight % of selenium and 25 to 15 weight % of tellurium.
Claim 4
Dependent Claim
24 words
An electrophotographic plate according to claim 1, wherein said second layer part of said photosensitizing layer comprises more than 90 weight % of selenium.
Claim 5
Dependent Claim
48 words
An electrophotographic plate according to claim 1, wherein the difference between the concentration of selenium in weight % in said first layer part of said photosensitizing layer and the concentration of selenium in weight % in said second layer part of said photosensitizing layer is more than 10.
Claim 6
Dependent Claim
17 words
An electrophotographic plate according to claim 1, wherein said second layer part is composed of selenium only.
Claim 7
Dependent Claim
24 words
An electrophotographic plate according to claim 1, wherein said second layer part of said photosensitizing layer has a substantially uniform concentration therein of selenium.
Claim 8
Dependent Claim
53 words
An electrophotographic plate according to claim 1, wherein said second layer part of said photosensitizing layer has a concentration of said selenium gradually increasing from the lowest concentration at the surface thereof facing said first layer part of said photosensitizing layer to the highest concentration at the surface thereof facing said top layer.
Claim 9
Dependent Claim
15 words
An electrophotographic plate according to claim 1, wherein said top layer consists essentially of poly-N-vinylcarbazole.
Claim 10
Dependent Claim
16 words
An electrophotographic plate according to claim 1, wherein said top layer consists essentially of brominated poly-N-vinylcarbazole.
Claim 11
Dependent Claim
19 words
An electrophotographic plate according to claim 1, wherein said top layer further contains an additive which is a binder.
Claim 12
Dependent Claim
23 words
An electrophotographic plate according to claim 10, wherein said binder is a member selected from the group consisting of polycarbonate and cyano-ethyl cellulose.
Claim 13
Dependent Claim
19 words
An electrophotographic plate according to claim 1, wherein said top layer further contains an additive which is a plasticizer.
Claim 14
Dependent Claim
28 words
An electrophotographic plate according to claim 12, wherein said plasticizer is a member selected from the group consisting of chlorinated diphenyl, epoxy resin, dioctyl phthalate and tricresyl phosphate.
Claim 15
Dependent Claim
54 words
A process for producing a latent electrostatic image of negative charge on an electrophotographic photosensitive plate defined by claim 1, comprising the steps of providing an electrostatic negative charge thereon in the dark and exposing said plate to a light image of visible light having a wavelength in the range between 4000A and 8000A.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |