US4233511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scorotron charging apparatus
Assignee: Ricoh Co Ltd
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Filing: 1979-03-19
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Granted: 1980-11-11
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Expires: 1999-03-19
Abstract
Abstract A plurality of parallel wires (27) are disposed between a corona discharge electrode (24) and a surface (13) to be electrostatically charged. The surface (13) is moved relative to the electrode (24) and wires (27). The wires (27) are equally spaced from each other in a plane (28) which is inclined relative to the surface (13) in such a manner that the spacing between the wires (27) and the surface (13) increases in the direction of movement of the surface (13) relative to the wires (27). A high voltage for corona discharge is applied to the electrode (24). A low voltage is applied to the wires (27) to prevent the surface (13) from being charged above a predetermined potential. The low voltage may be applied to the wires (27) by means of a zener diode (31) connected between the wires (27) and ground which prevents a potential induced in the wires (27) from the electrode (24) from exceeding the zener voltage of the diode (31).
Inventors
- 👤 Masahide Harada
- 👤 Manabu Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A corona charging apparatus for applying an electrostatic charge to a surface which is moved relative to the apparatus including a corona discharge electrode, characterized by comprising: a plurality of parallel wires disposed between the electrode and the surface and extending perpendicular to a direction of movement of the surface relative to the apparatus, a spacing between the wires and the surface progressively increasing in said direction of movement.
Claim 2
Dependent Claim
69 words
A corona charging apparatus for applying an electrostatic charge to a surface which is moved relative to the apparatus including a corona discharge electrode, characterized by comprising: a plurality of parallel wires disposed between the electrode and the surface and extending perpendicular to a direction of movement of the surface relative to the apparatus, a spacing between the wires and the surface progressively increasing in said direction of movement.
Claim 3
Dependent Claim
26 words
An apparatus as in claim 1, in which the wires are equally spaced from each other in a plane which is inclined relative to the surface.
Claim 4
Dependent Claim
26 words
An apparatus as in claim 1, further comprising power source means for applying a high voltage to the electrode and a low voltage to the wires.
Claim 5
Dependent Claim
26 words
An apparatus as in claim 1, further comprising a housing having an open end facing the surface, the electrode and wires being disposed in the housing.
Claim 6
Dependent Claim
34 words
An apparatus as in claim 4, in which the housing is mounted parallel to the surface, the wires being equally spaced from each other in a plane which is inclined relative to the housing.
Claim 7
Dependent Claim
33 words
An apparatus as in claim 4, in which the wires are equally spaced from each other in a plane which is parallel to the housing, the housing being inclined relative to the surface.
Claim 8
Dependent Claim
95 words
A corona charging apparatus for applying an electrostatic charge to a surface which is moved relative to the apparatus including a corona discharge electrode, characterized by comprising: a plurality of parallel wires disposed between the electrode and the surface, a spacing between the wires and the surface progressively increasing in a direction of movement of the surface relative to the apparatus; and a power source, the electrode being connected to a high voltage end of the power source, and a zener diode connected between the wires and a low voltage end of the power source.
Claim 9
Dependent Claim
95 words
A corona charging apparatus for applying an electrostatic charge to a surface which is moved relative to the apparatus including a corona discharge electrode, characterized by comprising: a plurality of parallel wires disposed between the electrode and the surface, a spacing between the wires and the surface progressively increasing in a direction of movement of the surface relative to the apparatus; and a power source, the electrode being connected to a high voltage end of the power source, and a zener diode connected between the wires and a low voltage end of the power source.
References Cited (Backward Citations)
US3160746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |