US3779204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner concentration and auto bias control apparatus
Assignee: Eastman Kodak Co
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Filing: 1972-08-14
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Granted: 1973-12-18
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Expires: 1992-08-14
Abstract
Abstract A toner concentration and auto bias control apparatus includes a circuit for producing a signal which is a function of the charged density of an electrostatic image passing a predetermined position of a path, a toner concentration control apparatus responsive to such signal for controlling the toner concentration of a mixture of toner and carrier and an auto bias circuit responsive to such signal for adjusting the potential of a developed electrode to influence the toning process.
Inventors
- 👤 C Altmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/065
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
For use in electrographic apparatus having a member charged with a pattern forming an electrostatic image, developing means for contacting such electrostatic images with a mixture of toner and carrier components to form toner images corresponding to the electrostatic images the development means including an electrode the potential applied to which is adjustable for influencing toning and actuable toner replenishment means effective when actuated for adding toner to the mixture to compensate for toner depletion resulting from forming the toner images, an improved toner replenishment control apparatus comprising: a. means for sensing the charge density on electrostatic images prior to toning and for producing a signal the magnitude of which is representative of the charge density thereof passing a predetermined position; b. means responsive to said signal for actuating the toner replenishment means to cause the addition of toner to the mixture; and c. means responsive to said signal to adjust the potential of the electrode.
Claim 2
Dependent Claim
156 words
For use in electrographic apparatus having a member charged with a pattern forming an electrostatic image, developing means for contacting such electrostatic images with a mixture of toner and carrier components to form toner images corresponding to the electrostatic images the development means including an electrode the potential applied to which is adjustable for influencing toning and actuable toner replenishment means effective when actuated for adding toner to the mixture to compensate for toner depletion resulting from forming the toner images, an improved toner replenishment control apparatus comprising: a. means for sensing the charge density on electrostatic images prior to toning and for producing a signal the magnitude of which is representative of the charge density thereof passing a predetermined position; b. means responsive to said signal for actuating the toner replenishment means to cause the addition of toner to the mixture; and c. means responsive to said signal to adjust the potential of the electrode.
Claim 3
Dependent Claim
140 words
In electrographic apparatus in which a surface carrying an electrostatic charge pattern is contacted at a development station by a developer mixture of carrier particles and electrostatically attractable toner particles to form a toner image on the surface according to the pattern, a toner concentration and auto bias control apparatus comprising: a. first means for sensing the electric field strength associated with an electrostatic charge pattern to provide a signal representatative thereof; and b. second means responsive to said signal for indicating the amount of toner which will be depleted by producing a second signal the magnitude of which is a function of the amount of toner which will be deposited on the surface; c. an adjustable potential electrode disposed at the development station; and d. third means responsive to said signal for adjusting the potential applied to said electrode.
Claim 4
Dependent Claim
140 words
In electrographic apparatus in which a surface carrying an electrostatic charge pattern is contacted at a development station by a developer mixture of carrier particles and electrostatically attractable toner particles to form a toner image on the surface according to the pattern, a toner concentration and auto bias control apparatus comprising: a. first means for sensing the electric field strength associated with an electrostatic charge pattern to provide a signal representatative thereof; and b. second means responsive to said signal for indicating the amount of toner which will be depleted by producing a second signal the magnitude of which is a function of the amount of toner which will be deposited on the surface; c. an adjustable potential electrode disposed at the development station; and d. third means responsive to said signal for adjusting the potential applied to said electrode.
Claim 5
Dependent Claim
52 words
The invention as set forth in claim 2 including: e. a container for storing toner particles; f. actuable means effective when actuated for causing toner from said container to be delivered to the mixture; and g. said second means including integrator means responsive to said second signal for actuating said actuable means.
Claim 6
Dependent Claim
16 words
The invention as set forth in claim 3 wherein said third means includes a delay circuit.
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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) | 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 |