US3660656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light lock for corona device
Assignee: Eastman Kodak Co
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Filing: 1970-08-26
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Granted: 1972-05-02
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Expires: 1990-08-26
Abstract
Abstract A device having corona discharge means for generating a flow of ions arranged within a chamber that is part of a dielectric housing and is provided with an elongated opening extending to the side of the housing positionable adjacent the surface of a moving sheet or web of dielectric or photosensitive material to be treated. The opening is covered with a metal screen or a small diameter rod can be arranged relative to the opening. The chamber is lined with an electrically conductive shield. The opening is of sufficient length so that it will extend across and beyond the side edges of the sheet or web that will be moved with respect thereto. Between the corona discharge means and the metal screen, an electrically conductive and biased steering rod is arranged to direct the flow of ions from said corona discharge means through said opening. An electrically conductive and biased plate is arranged between the corona discharge means and the steering rod to shape the electrical field established relative to the surface of the material to focus the flow of ions toward the screen and to prevent irradiation from said corona discharge means from passing through said opening and damaging the material being treated. The device can be used with either an AC or DC source of potential applied to the corona discharge means depending upon the type of material being treated.
Inventors
- 👤 Lee F Frank
- 👤 George W Alley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:04
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; H; H05; H05F; H05F3/00; H05F3/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
A device for generating and directing a flow of ions toward a surface of a dielectric material for altering the electrostatic condition thereof, said apparatus comprising: a dielectric housing having a chamber provided with an elongated opening extending to the side of said housing facing said surface; an electrically biased shield generally lining said chamber and having an elongated opening aligned with and smaller in width than the opening in said housing; corona discharge means arranged within said chamber and connected to a source of potential for generating a flow of ions and establishing an electrical field relative to said surface; and electrically biased means comprising grid means mounted on said housing relative to said opening therein and between said corona discharge means and said surface and generally in alignment with said opening in said shield for directionally controlling said flow of ions toward said surface and means arranged within said housing between said corona discharge means and grid means for shAping said electrical field and focusing said flow of ions toward said grid means and for inhibiting the passage through said openings of any direct irradiation from said corona discharge means.
Claim 2
Independent Claim
192 words
A device for generating and directing a flow of ions toward a surface of a dielectric material for altering the electrostatic condition thereof, said apparatus comprising: a dielectric housing having a chamber provided with an elongated opening extending to the side of said housing facing said surface; an electrically biased shield generally lining said chamber and having an elongated opening aligned with and smaller in width than the opening in said housing; corona discharge means arranged within said chamber and connected to a source of potential for generating a flow of ions and establishing an electrical field relative to said surface; and electrically biased means comprising grid means mounted on said housing relative to said opening therein and between said corona discharge means and said surface and generally in alignment with said opening in said shield for directionally controlling said flow of ions toward said surface and means arranged within said housing between said corona discharge means and grid means for shAping said electrical field and focusing said flow of ions toward said grid means and for inhibiting the passage through said openings of any direct irradiation from said corona discharge means.
Claim 3
Independent Claim
232 words
A device for generating and directing a flow of ions toward a surface of a dielectric material for altering the electrostatic condition thereof, said apparatus comprising: a dielectric housing having a chamber provided with an elongated opening extending to the side of said housing facing said surface; an electrically biased shield generally lining said chamber and having an elongated opening aligned with and smaller in width than the opening in said housing; corona discharge means arranged within said chamber and connected to a source of potential for generating a flow of ions and establishing an electrical field relative to said surface; grid means mounted on said side in overlying relationship to said opening in said housing and providing an exit slot generally in alignment with said openings and positionable adjacent said surface, said grid means being electrically biased for controlling said flow of ions; blocking means arranged within said chamber intermediate said corona discharge means and said grid means and electrically biased serially with said shield for shaping said electrical field and focusing said flow of ions toward said grid means and for inhibiting the passage through said exit slot of any direct irradiation from said corona discharge means; and steering means arranged within said chamber intermediate said blocking means and said grid means and electrically biased for directionally controlling said flow of ions relative to said grid means and said surface.
Claim 4
Independent Claim
232 words
A device for generating and directing a flow of ions toward a surface of a dielectric material for altering the electrostatic condition thereof, said apparatus comprising: a dielectric housing having a chamber provided with an elongated opening extending to the side of said housing facing said surface; an electrically biased shield generally lining said chamber and having an elongated opening aligned with and smaller in width than the opening in said housing; corona discharge means arranged within said chamber and connected to a source of potential for generating a flow of ions and establishing an electrical field relative to said surface; grid means mounted on said side in overlying relationship to said opening in said housing and providing an exit slot generally in alignment with said openings and positionable adjacent said surface, said grid means being electrically biased for controlling said flow of ions; blocking means arranged within said chamber intermediate said corona discharge means and said grid means and electrically biased serially with said shield for shaping said electrical field and focusing said flow of ions toward said grid means and for inhibiting the passage through said exit slot of any direct irradiation from said corona discharge means; and steering means arranged within said chamber intermediate said blocking means and said grid means and electrically biased for directionally controlling said flow of ions relative to said grid means and said surface.
Claim 5
Dependent Claim
31 words
A device in accordance with claim 2 wherein said shield is generally cylindrical and provided with an axial opening generally aligned with said opening in said housing and said exit slot.
Claim 6
Dependent Claim
22 words
A device in accordance with claim 3 wherein the edges of said exit slot are rounded and polished to inhibit corona generation.
Claim 7
Dependent Claim
26 words
A device in accordance with claim 3 wherein at least the inner surface of said shield is coated with a layer of ultra-violet radiation absorbing material.
Claim 8
Dependent Claim
52 words
A device in accordance with claim 2 wherein said grid means comprises an electrically conductive member secured to said side adjacent each edge of said opening, the facing edges of said members forming said exit slot, and a metal screen overlying said exit slot and electrically connected to each of said members.
Claim 9
Dependent Claim
55 words
A device in accordance with claim 2 wherein said grid means comprises an electrically conductive member secured to said side adjacent each edge of said opening, the facing edges of said members forming said exit slot and at least one metallic member extending longitudinally of said slot and electrically connected to each of said members.
Claim 10
Dependent Claim
55 words
A device in accordance with claim 2 wherein said blocking means comprises an arcuate electrically conductive plate having a length and a width relative to those of said opening in said shield and said exit slot so as to prevent the passage through said exit slot of any direct irradiation from said corona discharge means.
Claim 11
Dependent Claim
47 words
A device in accordance with claim 8 wherein the curvature of said plate corresponds generally to that of said shield and is positioned so as to curve away from said corona discharge means and the width of said plate is greater than that of said exit slot.
Claim 12
Dependent Claim
24 words
A device in accordance with claim 2 wherein said steering means comprises a metal rod axially aligned with said openings and said exit slot.
Claim 13
Dependent Claim
16 words
A device in accordance with claim 2 wherein said source of potential is a direct current.
Claim 14
Dependent Claim
16 words
A device in accordance with claim 2 wherein said source of potential is an alternating current.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |