Patent US5459559A successfully refreshed from Google Patents.
US5459559A
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Magnetic brush developing method using a two-component developer
Assignee: Canon Inc
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Filing: 1994-10-05
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Granted: 1995-10-17
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Expires: 2014-10-05
Abstract
Abstract A developing method for developing an electrostatic image on an image bearing member with a two-component developer includes the steps of bearing a developer containing toner particles and carrier particles on a developer bearing member to a contact region formed between the developer bearing member and an image bearing member bearing an electrostatic image thereon, and rubbing the image bearing member with the magnetic brush with a contact pressure equal to 0.7 gf/cm 2 or less.
Inventors
- 👤 Yukio Nagase
- 👤 Kenichiro Waki
- 👤 Hiroyuki Suzuki
- 👤 Masaru Hibino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:28
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G13/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A developing method comprising the steps of: bearing a developer including toner particles and carrier particles on a developer bearing member to a developing region formed between the developer bearing member and an image bearing member bearing an electrostatic image thereon; forming a magnetic brush of carrier particles and toner particles on the developer bearing member in the developing region; and rubbing the image bearing member in the developing region with the magnetic brush formed on the developer bearing member with a contact pressure equal to 0.7gf/cm 2 or less.
Claim 2
Dependent Claim
90 words
A developing method comprising the steps of: bearing a developer including toner particles and carrier particles on a developer bearing member to a developing region formed between the developer bearing member and an image bearing member bearing an electrostatic image thereon; forming a magnetic brush of carrier particles and toner particles on the developer bearing member in the developing region; and rubbing the image bearing member in the developing region with the magnetic brush formed on the developer bearing member with a contact pressure equal to 0.7gf/cm 2 or less.
Claim 3
Dependent Claim
22 words
A developing method according to claim 1, wherein the contact pressure is in the range of 0.1gf/cm 2 to 0.7gf/cm 2 .
Claim 4
Dependent Claim
72 words
A developing method according to claim 1, wherein the magnetic brush forming step comprises the steps of: providing the developer bearing member with a magnetic pole at a developing portion thereof; and providing the carrier particles with a magnetization intensity equal to 120emu/cm 3 or less when the peak magnetic field intensity of the magnetic pole in a portion of the developer bearing member closest to the image bearing member is applied.
Claim 5
Dependent Claim
22 words
A developing method according to claim 3, wherein the magnetization intensity is in the range of 30emu/cm 3 to 20emu/cm 3 .
Claim 6
Dependent Claim
17 words
A developing method according to claim 1, wherein the image bearing member includes an amorphous silicon photoconductor.
Claim 7
Dependent Claim
27 words
A developing method according to claim 1, further comprising the step of forming an alternating electric field between the image bearing member and the developer bearing member.
References Cited (Backward Citations)
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JPS6431576A
Cited
US5078085A
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US5296328A
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US5420215A
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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) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |