US3780288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for minimizing image smear due to ion caused undercutting
Assignee: Xerox Corp
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Filing: 1971-07-06
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Granted: 1973-12-18
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Expires: 1991-07-06
Abstract
Abstract Apparatus for minimizing the smear of an image formed by xeroradiography. In one embodiment, a distributed capacitor, positioned adjacent to and substantially parallel to a sensitized plate and electrically connected thereto, is charged before an object is exposed to penetrating radiation, the electric field generated by the charged capacitor minimizing image smear. In a second embodiment, a metal electrode is coupled to the conductive substrate which comprises part of the sensitized plate via a lumped capacitor, the electric field generated between the metal electrode and plate minimizing image smear.
Inventors
- 👤 V Dryden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/054
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
Apparatus for minimizing image smear of an image formed by exposing an object to penetrating radiation, the penetrating radiation transmitted by said object forming a latent electrostatic image on the surface of an initially charged photoconductor layer positioned adjacent thereto, said photoconductor layer overlying a conductive substrate comprising: a distributed capacitor spaced apart from and substantially parallel to the surface of said photoconductor, said distributed capacitor comprising an insulating layer sandwiched between layers of conductive material, means for electrically connecting one layer of said conductive material to said conductive substrate, means for charging said capacitor to a predetermined potential prior to exposing said object to said penetrating radiation, and means for exposing said object to said penetrating radiation whereby a latent electrostatic charge pattern corresponding to the intensity of the radiation transmitted through the object is formed on said photoconductor layer.
Claim 2
Dependent Claim
141 words
Apparatus for minimizing image smear of an image formed by exposing an object to penetrating radiation, the penetrating radiation transmitted by said object forming a latent electrostatic image on the surface of an initially charged photoconductor layer positioned adjacent thereto, said photoconductor layer overlying a conductive substrate comprising: a distributed capacitor spaced apart from and substantially parallel to the surface of said photoconductor, said distributed capacitor comprising an insulating layer sandwiched between layers of conductive material, means for electrically connecting one layer of said conductive material to said conductive substrate, means for charging said capacitor to a predetermined potential prior to exposing said object to said penetrating radiation, and means for exposing said object to said penetrating radiation whereby a latent electrostatic charge pattern corresponding to the intensity of the radiation transmitted through the object is formed on said photoconductor layer.
Claim 3
Dependent Claim
37 words
The apparatus as defined in claim 1 wherein the charge formed on the layer of conductive material facing said photoconductor layer is opposite in polarity to the polarity of the charge initially formed on said photoconductor surface.
Claim 4
Dependent Claim
22 words
The apparatus as defined in claim 1 wherein said charging means is removed prior to exposing said object to said penetrating radiation.
Claim 5
Dependent Claim
95 words
A cassette for enclosing in a light-tight environment a photoconductor layer formed on a conductive substrate, said photoconductor layer having a latent electrostatic charge formed thereon, said cassette including lid and bottom portions, said photoconductor layer being supported in the bottom portion comprising: a distributed capacitor spaced apart from and substantially parallel to the surface of said photoconductor layer, said distributed capacitor comprising an insulating layer sandwiched between layers of conductive material and attached to the inside of said lid, and means for electrically connecting one layer of said conductive material to said conductive substrate.
Claim 6
Dependent Claim
95 words
A cassette for enclosing in a light-tight environment a photoconductor layer formed on a conductive substrate, said photoconductor layer having a latent electrostatic charge formed thereon, said cassette including lid and bottom portions, said photoconductor layer being supported in the bottom portion comprising: a distributed capacitor spaced apart from and substantially parallel to the surface of said photoconductor layer, said distributed capacitor comprising an insulating layer sandwiched between layers of conductive material and attached to the inside of said lid, and means for electrically connecting one layer of said conductive material to said conductive substrate.
Claim 7
Dependent Claim
28 words
The cassette as defined in claim 4 further including means within said cassette for electrically coupling a source of potential applied thereto across said layers of conductive material.
Claim 8
Dependent Claim
86 words
A cassette having lid and bottom portions comprising: a distributed capacitor supported within said lid portion and comprising an insulating layer sandwiched between layers of conductive material, means for electrically coupling a source of potential applied thereto across said layers of conductive material, means in said cassette bottom portion for supporting a plate member inserted in said cassette, said plate member spaced apart from and substantially parallel to said distributed capacitor, and means for electrically connecting one layer of said conductive material to said plate member.
Claim 9
Dependent Claim
86 words
A cassette having lid and bottom portions comprising: a distributed capacitor supported within said lid portion and comprising an insulating layer sandwiched between layers of conductive material, means for electrically coupling a source of potential applied thereto across said layers of conductive material, means in said cassette bottom portion for supporting a plate member inserted in said cassette, said plate member spaced apart from and substantially parallel to said distributed capacitor, and means for electrically connecting one layer of said conductive material to said plate member.
Claim 10
Dependent Claim
31 words
The cassette as defined in claim 6 wherein said plate member comprises a photoconductor layer overlying a conductive substrate, said layer of conductive material being electrically connected to said conductive substrate.
References Cited (Backward Citations)
US2802948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |