US5045893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highlight printing apparatus
Assignee: International Business Machines Corp
•
Filing: 1990-07-02
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Granted: 1991-09-03
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Expires: 2010-07-02
Abstract
Abstract Apparatus and method of forming plural images, wherein the method includes the steps of: uniformly charging a charge retentive belt; discharging portions of the uniformly charged belt to form relatively high and low voltage areas of the same polarity on the belt; providing a high resolution development system; providing an electrical bias for said development system such that a relatively large development field is provided between said developer structure forming a part of the development system and the relatively low voltage; using the high resolution development system, developing the areas of relatively low voltage with first toner material contained in the developer structure; discharging portions of the relatively high voltage areas of the charge retentive belt to form areas at a voltage level intermediate the relatively high and low voltage areas; and developing the areas of high voltage level with a second toner material which is distinct and of opposite polarity from said first toner material.
Inventors
- 👤 Charles H. Tabb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:25
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01; G03G13/013; G03G15/00; G03G15/01; G03G15/0105; G03G15/0126; G03G2215/00; G03G2215/04; G03G2215/0495
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
164 words
The method of forming plural images, said method including the steps of: uniformly charging a charge retentive belt; discharging portions of said uniformly charged retentive belt to form relatively high and low voltage areas of the same polarity on said belt; providing a high resolution development system; providing an electrical bias for said development system such that a relatively large development field is provided between said developer structure forming a part of said development system and said relatively low voltage areas; using said high resolution development system, developing said areas of relatively low voltage with first toner material contained in said developer structure; discharging portions of said relatively high voltage areas of said charge retentive belt to form areas at a voltage level intermediate said relatively high and low voltage areas; and developing the remaining areas of high voltage level with a second toner material which is distinct and of opposite polarity from said first toner material leaving said intermediate voltage background level undisturbed.
Claim 2
Independent Claim
164 words
The method of forming plural images, said method including the steps of: uniformly charging a charge retentive belt; discharging portions of said uniformly charged retentive belt to form relatively high and low voltage areas of the same polarity on said belt; providing a high resolution development system; providing an electrical bias for said development system such that a relatively large development field is provided between said developer structure forming a part of said development system and said relatively low voltage areas; using said high resolution development system, developing said areas of relatively low voltage with first toner material contained in said developer structure; discharging portions of said relatively high voltage areas of said charge retentive belt to form areas at a voltage level intermediate said relatively high and low voltage areas; and developing the remaining areas of high voltage level with a second toner material which is distinct and of opposite polarity from said first toner material leaving said intermediate voltage background level undisturbed.
Claim 3
Dependent Claim
27 words
The method according to claim 1 wherein said high resolution development system comprises a plurality of developer rolls positioned in intimate contact with said charge retentive belt.
Claim 4
Dependent Claim
23 words
The method according to claim 2 wherein said relatively high and low voltage areas are formed using a 600 SPI raster output scanner.
Claim 5
Dependent Claim
42 words
The method according to claim 3 wherein the discharging of portions of said relatively high voltage areas of said charge retentive belt to a voltage level intermediate said relatively high and low voltage areas is effected using a low UMC imaging member.
Claim 6
Dependent Claim
17 words
The method according to claim 4 wherein said low UMC imaging member comprises a 300 SPI device.
Claim 7
Dependent Claim
18 words
The method according to claim 5 wherein said areas of relatively low voltage are developed with black toner.
Claim 8
Dependent Claim
18 words
The method according to claim 6 wherein said areas of relatively high voltage are developed with colored toner.
Claim 9
Dependent Claim
17 words
The method according to claim 3 wherein said high resolution development system comprises insulative magnetic brush development.
Claim 10
Dependent Claim
143 words
Apparatus for forming plural images using a charge retentive belt, said apparatus comprising: means for uniformly charging said belt; means for discharging portions of said uniformly charged retentive belt to form relatively high and low voltage areas of the same polarity on said belt; a high resolution development system for developing said areas of relatively low voltage; means for electrically biasing of said development system such that a relatively large development field is provided between said developer structure forming a part of said development system and said relatively low voltage; means for discharging portions of said relatively high voltage areas of said charge retentive belt to form areas at a voltage level intermediate said relatively high and low voltage areas; and means for developing said areas of high voltage level with a second toner material which is distinct from said first toner material.
Claim 11
Dependent Claim
143 words
Apparatus for forming plural images using a charge retentive belt, said apparatus comprising: means for uniformly charging said belt; means for discharging portions of said uniformly charged retentive belt to form relatively high and low voltage areas of the same polarity on said belt; a high resolution development system for developing said areas of relatively low voltage; means for electrically biasing of said development system such that a relatively large development field is provided between said developer structure forming a part of said development system and said relatively low voltage; means for discharging portions of said relatively high voltage areas of said charge retentive belt to form areas at a voltage level intermediate said relatively high and low voltage areas; and means for developing said areas of high voltage level with a second toner material which is distinct from said first toner material.
Claim 12
Dependent Claim
26 words
Apparatus according to claim 9 wherein said high resolution development system comprises a plurality of developer rolls positioned in intimate contact with said charge retentive belt.
Claim 13
Dependent Claim
22 words
Apparatus according to claim 10 wherein said relatively high and low voltage areas are formed using a 600 SPI raster output scanner.
Claim 14
Dependent Claim
22 words
Apparatus according to claim 11 wherein said means for discharging portions of said relatively high voltage comprises a low UMC imaging member.
Claim 15
Dependent Claim
16 words
Apparatus according to claim 12 wherein said low UMC imaging member comprises a 300 SPI device.
Claim 16
Dependent Claim
17 words
Apparatus according to claim 13 wherein said areas of relatively low voltage area developed with black toner.
Claim 17
Dependent Claim
18 words
The method according to claim 14 wherein said areas of relatively high voltage are developed with colored toner.
Claim 18
Dependent Claim
17 words
The method according to claim 10 wherein said high resolution development system comprises insulative magnetic brush development.
Claim 19
Dependent Claim
23 words
The method according to claim 6 wherein a conductive magnetic brush development system is used for developing said areas of relatively high voltage.
Claim 20
Dependent Claim
18 words
Apparatus according to claim 13 including conductive magnetic brush development means for developing said relatively high voltage areas.
Claim 21
Dependent Claim
14 words
Apparatus according to claim 18 wherein said conductive magnetic development system comprises colored toner.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |