US3711710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for controlling corona emission
Assignee: Research Laboratories of Australia Pty Ltd
•
Filing: 1970-11-02
•
Granted: 1973-01-16
•
Expires: 1990-11-02
Abstract
Abstract A method of controlling the area developed by a corona discharge which consists in providing a shield around the corona point and controlling the effect to the shield to have the focussing effect on the corona preferably by controlling the position of the electrical charge or the electrical resistivity of the shield.
Inventors
- 👤 R Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/325
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
278 words
A method of charging a dieelectric surface of a recording member in patterned form comprising the following steps: A. mounting a point-discharge corona discharge member in close proximity to a grounded backing member with the charging point of said discharge member directed toward but spaced from said backing member; B. positioning a shield member in encompassing relation to said charging point of said discharge member, said shield member having a relatively large, continuous planar surface facing said backing member within a range in which the charging point of the discharge member extends beyond the plane of the shield surface by no more than a fraction of an inch; C. positioning a recording member on said backing member with a given portion of the dielectric surface of said recording member facing said charging point; D. energizing said corona discharge member from a high voltage power supply to generate a corona discharge between said charging point of said discharge member and said recording member; E. adjusting the position of said shield member, relative to said charging point, within a range in which the charging point of the discharge member extends beyond the plane of the shield surface by no more than a fraction of an inch, to produce a charge area on said dielectric surface that is substantially smaller than and more sharply defined than the charge area produced by said point, at the same position and with the same energization, in the absence of said shield member; F. and repeating steps C and D, for different portions of the dielectric surface of said recording member, to produce a pattern of sharply defined charge areas on said recording member surface.
Claim 2
Independent Claim
278 words
A method of charging a dieelectric surface of a recording member in patterned form comprising the following steps: A. mounting a point-discharge corona discharge member in close proximity to a grounded backing member with the charging point of said discharge member directed toward but spaced from said backing member; B. positioning a shield member in encompassing relation to said charging point of said discharge member, said shield member having a relatively large, continuous planar surface facing said backing member within a range in which the charging point of the discharge member extends beyond the plane of the shield surface by no more than a fraction of an inch; C. positioning a recording member on said backing member with a given portion of the dielectric surface of said recording member facing said charging point; D. energizing said corona discharge member from a high voltage power supply to generate a corona discharge between said charging point of said discharge member and said recording member; E. adjusting the position of said shield member, relative to said charging point, within a range in which the charging point of the discharge member extends beyond the plane of the shield surface by no more than a fraction of an inch, to produce a charge area on said dielectric surface that is substantially smaller than and more sharply defined than the charge area produced by said point, at the same position and with the same energization, in the absence of said shield member; F. and repeating steps C and D, for different portions of the dielectric surface of said recording member, to produce a pattern of sharply defined charge areas on said recording member surface.
Claim 3
Dependent Claim
36 words
A method for charging dielectric surfaces in accordance with claim 1, further characterized in that control of the size of the area charged is obtained by the step of varying the electrical resistivity of said shield.
Claim 4
Dependent Claim
40 words
A method for charging dielectric surfaces in accordance with claim 1, further characterized in that control of the size of the area charged is obtained by the step of varying the resistance between the corona charging point and the shield.
Claim 5
Dependent Claim
37 words
A method for charging dielectric surfaces in accordance with claim 1 further characterized in that the charge on the said shield is controlled by actuating a variable resistance means between the corona charging point and the shield.
References Cited (Backward Citations)
US3358289A
Cited
US3220324A
Cited
US3541329A
Cited
US3555378A
Cited
US3492476A
Cited
US3603851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |