US4666804A
Expired / Lapsed
US
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Method of and apparatus for image forming
Assignee: Konica Minolta Inc
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Filing: 1985-07-02
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Granted: 1987-05-19
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Expires: 2005-07-02
Abstract
Abstract A method for forming an image wherein a latent image is produced on an image retainer and the latent image is developed by a plurality of different color toners. The developing is carried out by non-contact manner while an a.c. electric field is being applied in and after at least the second color development. The developed images of different colors are transferred to a transfer medium at a time.
Inventors
- 👤 Satoshi Haneda
- 👤 Hisashi Shoji
- 👤 Seiichiro Hiratsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/06; G03G15/065
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A method for forming an image on an electrophotographic element comprising imagewise exposing said element to produce a latent image on an image retainer, developing said latent image by superposing a plurality of different color toners successively, and implementing non-contact development while an a.c. electric field is being applied in and after at least the second color development, said method satisfying the equations 0.2≦V.sub.AC/df [(V.sub.AC/d)-1500]/f≦1.0 wherein V AC is the amplitude of the alternating current component of the developing bias in volts, f is the frequency in Hz, and d is the gap between the image retainer and the sleeve in millimeters.
Claim 2
Independent Claim
102 words
A method for forming an image on an electrophotographic element comprising imagewise exposing said element to produce a latent image on an image retainer, developing said latent image by superposing a plurality of different color toners successively, and implementing non-contact development while an a.c. electric field is being applied in and after at least the second color development, said method satisfying the equations 0.2≦V.sub.AC/df [(V.sub.AC/d)-1500]/f≦1.0 wherein V AC is the amplitude of the alternating current component of the developing bias in volts, f is the frequency in Hz, and d is the gap between the image retainer and the sleeve in millimeters.
Claim 3
Dependent Claim
34 words
A method for forming an image as claimed in claim 1, wherein said steps includes a process for transferring to a transfer medium the toner image piled on said image retainer at a time.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said equations are 0.5≦V.sub.AC/df [(V.sub.AC/d)-1500]/f≦1.0.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein said equations are 0.5≦V.sub.AC/df [(V.sub.AC/d)-1500]/f≦0.8.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein said latent image is developed by a toner and a carrier, said carrier having a resistance of more than 10 8 ohm-cm.
Claim 7
Dependent Claim
14 words
The method of claim 5 wherein said resistance is more than 10 13 ohm-cms.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein said latent image is developed by a toner and a carrier, the particle diameter of said carrier being 5 to 50 microns.
Claim 9
Dependent Claim
28 words
The method of claim 1 wherein said latent image is developed by a toner and a carrier, the particle diameter of said toner being 1 to 20 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |