US4669854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic charge-removing device having filter
Assignee: Fujifilm Business Innovation Corp
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Filing: 1984-02-23
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Granted: 1987-06-02
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Expires: 2004-02-23
Abstract
Abstract An electrostatic charge-removing device adapted to remove electrostatic charges formed on a light-sensitive member of a copying machine using a tungsten lamp as an erasing lamp. A filter for cutting off light of longer wavelengths is provided between the tungsten lamp and the light-sensitive member. With this device, the sensitivity of the light-sensitive member is not affected, the amount of output light does not vary with changes in the ambient temperature, and a stable amount of light is obtained over long periods of time. Moreover, the lamp can be started instantaneously without the use of a special circuit.
Inventors
- 👤 Hideo Ichikawa
- 👤 Mitsuharu Nakaguchi
- 👤 Hidekazu Yumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:56
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G21/08; G03G15/00; G03G15/14; G03G15/16; G03G15/169
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
In an electrostatic charge-removing device using a tungsten lamp as an erasing lamp for removing electrostatic charge formed on a light-sensitive member of a copying machine, the improvement comprising; a filter for cutting off light from said lamp having a wavelength above 600 nm disposed between said tungsten lamp and said light-sensitive member, wherein said light above 600 nm increases the residual potential of said light sensitive member; and said charge-removing device is disposed between a developing unit and a corona charging unit of said copying device.
Claim 2
Dependent Claim
87 words
In an electrostatic charge-removing device using a tungsten lamp as an erasing lamp for removing electrostatic charge formed on a light-sensitive member of a copying machine, the improvement comprising; a filter for cutting off light from said lamp having a wavelength above 600 nm disposed between said tungsten lamp and said light-sensitive member, wherein said light above 600 nm increases the residual potential of said light sensitive member; and said charge-removing device is disposed between a developing unit and a corona charging unit of said copying device.
Claim 3
Dependent Claim
24 words
The electrostatic charge-removing device of claim 1, wherein said charge-removing device is disposed in front of a corona charging unit of said copying machine.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |