Patent US4910535A successfully refreshed from Google Patents.
US4910535A
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US
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Image forming apparatus
Assignee: Konica Minolta Inc
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Filing: 1989-01-27
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Granted: 1990-03-20
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Expires: 2009-01-27
Abstract
Abstract An image forming apparatus wherein a toner image obtained by developing a first electrostatic latent image with a first color dry toner by a first developing device and a toner image obtained by developing a second electrostatic latent image with second color dry toner which is different in color from said first color dry toner by a second developing means are superposed on an image retainer, and wherein toner feeding speeds at which the first and second developing devices develop the first and second electrostatic latent images, resepctively, are different from each other and an attached amount of the second color toner is smaller than that of the first color toner.
Inventors
- 👤 Kunihisa Yoshino
- 👤 Kimio Nishizawa
- 👤 Hiroshi Tokunaga
- 👤 Toshihiro Takesue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/0126; G03G13/00; G03G13/01; G03G13/013; G03G13/0135
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
140 words
An image forming apparatus comprising means for forming a first electrostatic latent image on an image retainer, first developing means for developing said first electrostatic latent image with a first color dry toner to form a toner image on said image retainer, means for forming a second electrostatic latent image on said toner image, second developing means for developing said second electrostatic latent image with second color dry toner which is different in color from said first color dry toner, to form a color image consisting of superposed toners, and control means for controlling so that toner feeding speeds at which said first and second developing means develop said first and second electrostatic latent images, respectively, are different from each other and that an attached amount of said second color toner is smaller than that of said first color toner.
Claim 2
Dependent Claim
140 words
An image forming apparatus comprising means for forming a first electrostatic latent image on an image retainer, first developing means for developing said first electrostatic latent image with a first color dry toner to form a toner image on said image retainer, means for forming a second electrostatic latent image on said toner image, second developing means for developing said second electrostatic latent image with second color dry toner which is different in color from said first color dry toner, to form a color image consisting of superposed toners, and control means for controlling so that toner feeding speeds at which said first and second developing means develop said first and second electrostatic latent images, respectively, are different from each other and that an attached amount of said second color toner is smaller than that of said first color toner.
Claim 3
Dependent Claim
25 words
The image forming apparatus according to claim 1, wherein means for forming said first and second electrostatic latent images are the same with each other.
Claim 4
Dependent Claim
17 words
The image forming apparatus according to claim 1, wherein said second developing means is non-contact developing means.
Claim 5
Dependent Claim
19 words
The image forming apparatus according to claim 1, wherein said developing means are applied with AC and DC biases.
Claim 6
Dependent Claim
19 words
The image forming apparatus according to claim 1, wherein said first and second developing means are two-component developing means.
Claim 7
Dependent Claim
23 words
The image forming apparatus according to claim 1, said first or second color toner is one of Y, M, C and BK toners.
Claim 8
Dependent Claim
25 words
The image forming apparatus according to claim 1, wherein said electrostatic latent image forming means charges uniformly and exposes with laser beam the image retainer.
Claim 9
Dependent Claim
28 words
The image forming apparatus according to claim 1, wherein the toner feeding speed is controlled by varying the revolution number of a developing sleeve in said developing means.
Claim 10
Dependent Claim
279 words
The image forming apparatus comprising means for forming a first electrostatic latent image on an image retainer, first developing means for developing said first electrostatic latent image with a first color dry toner to form a first toner image on said image retainer while said image retainer is rotated, means for forming a second electrostatic latent image on said first toner image, second developing means for developing in non-contact manner said second electrostatic latent image with second color dry toner which is different in color from said first color dry toner, to form a second toner image on said first toner image while said image retainer is rotated, means for forming a third electrostatic latent image on said second toner image, third developing means for developing in non-contact manner said third electrostatic latent image with third color dry toner which is different in color from said first and second color dry toners, to form a third toner image on said second toner image while said image retainer is rotated, means for forming a fourth electrostatic latent image on said third toner image, fourth developing means for developing in non-contact manner said fourth electrostatic latent image with fourth color dry toner which is different in color from said first, second and third color dry toners, to form a color image consisting of superposed toners while said image retainer is rotated, and control means for controlling so that toner feeding speeds V Y , V C , V M , V BK at which said first to fourth developing means develop said first to fourth electrostatic latent images, respectively, are set as V BK >V M >V C >V Y .
Claim 11
Dependent Claim
279 words
The image forming apparatus comprising means for forming a first electrostatic latent image on an image retainer, first developing means for developing said first electrostatic latent image with a first color dry toner to form a first toner image on said image retainer while said image retainer is rotated, means for forming a second electrostatic latent image on said first toner image, second developing means for developing in non-contact manner said second electrostatic latent image with second color dry toner which is different in color from said first color dry toner, to form a second toner image on said first toner image while said image retainer is rotated, means for forming a third electrostatic latent image on said second toner image, third developing means for developing in non-contact manner said third electrostatic latent image with third color dry toner which is different in color from said first and second color dry toners, to form a third toner image on said second toner image while said image retainer is rotated, means for forming a fourth electrostatic latent image on said third toner image, fourth developing means for developing in non-contact manner said fourth electrostatic latent image with fourth color dry toner which is different in color from said first, second and third color dry toners, to form a color image consisting of superposed toners while said image retainer is rotated, and control means for controlling so that toner feeding speeds V Y , V C , V M , V BK at which said first to fourth developing means develop said first to fourth electrostatic latent images, respectively, are set as V BK >V M >V C >V Y .
Claim 12
Dependent Claim
20 words
The image forming apparatus according to claim 9, wherein said first to fourth developing means are applied with AC biases.
Claim 13
Dependent Claim
143 words
An image forming apparatus comprising means for forming a first electrostatic latent image on an image retainer, first developing means for developing said first electrostatic latent image with a first color dry toner to form a toner image on said image retainer, means for forming a second electrostatic latent image on said toner image, and second developing means for developing said second electrostatic latent image with second color dry toner which is different in color from said first color dry toner, to form a color image consisting of superposed toners, wherein toner feeding speeds at which said first and second developing means develop said first and second electrostatic latent images, respectively, are different from each other and wherein said toner feeding speeds are set similar to each other when the toner density in each of said first and second developing means is detected.
Claim 14
Dependent Claim
143 words
An image forming apparatus comprising means for forming a first electrostatic latent image on an image retainer, first developing means for developing said first electrostatic latent image with a first color dry toner to form a toner image on said image retainer, means for forming a second electrostatic latent image on said toner image, and second developing means for developing said second electrostatic latent image with second color dry toner which is different in color from said first color dry toner, to form a color image consisting of superposed toners, wherein toner feeding speeds at which said first and second developing means develop said first and second electrostatic latent images, respectively, are different from each other and wherein said toner feeding speeds are set similar to each other when the toner density in each of said first and second developing means is detected.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |