US5467176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming method and apparatus with magnetic brush
Assignee: Fujitsu Ltd
•
Filing: 1994-03-30
•
Granted: 1995-11-14
•
Expires: 2014-03-30
Abstract
Abstract An electrostatic latent image is developed on a latent image carrier and residual toners are collected at the same time. An electrostatic latent image is formed on a rotary endless latent image carrier; developer, including magnetic toners and magnetic carriers, is supplied to a developing area for developing the latent image carrier, and a magnetic brush is formed with the developer in the developing area to thereby collect residual toners on the latent image carrier and develop the electrostatic latent image on the latent image carrier; and the developed image on the latent image carrier is transferred to a sheet. An electrostatic latent image may be developed with a rotary endless latent image carrier; an image forming unit for forming an electrostatic latent image on the latent image carrier; a developing unit having a developer, including magnetic toners and magnetic carriers, and a developer supplying unit for supplying the developer to a developing area for developing the latent image carrier and forming a magnetic brush with the developer in the developing area in order to develop the electrostatic latent image on the latent image carrier with a powdery developer and collect residual toners on the latent image carrier; and a transfer unit for transferring the developed image on the latent image carrier to a sheet.
Inventors
- 👤 Tsuneo Watanuki
- 👤 Yasushige Nakamura
- 👤 Satoshi Takezawa
- 👤 Norio Sawatari
- 👤 Akira Nagahara
- 👤 Sachio Sasaki
- 👤 Mitsuru Sato
- 👤 Shigenobu Utaka
- 👤 Takefumi Takahashi
- 👤 Masahiro Wanou
- 👤 Masao Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:35
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G13/09; G03G21/00; G03G21/0005; G03G21/0064; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/0806; G03G9/0825; G03G9/0827; G03G2215/00; G03G2215/00004; G03G2215/00012; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0607; G03G2215/0609; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 67
Claim 1
Independent Claim
98 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set to near a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 2
Dependent Claim
98 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set to near a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 3
Dependent Claim
16 words
The image forming method according to claim 1, wherein said magnetic toners includes magnetic polymerization toners.
Claim 4
Dependent Claim
30 words
The image forming method according to claim 2, wherein said magnetic polymerization toners are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic powder.
Claim 5
Dependent Claim
29 words
The image forming method according to claim 3, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 6
Dependent Claim
51 words
The image forming method according to claim 2, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 7
Dependent Claim
98 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set lower than a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 8
Dependent Claim
98 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set lower than a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 9
Dependent Claim
16 words
The image forming method according to claim 6, wherein said magnetic toners includes magnetic polymerization toners.
Claim 10
Dependent Claim
30 words
The image forming method according to claim 7, wherein said magnetic polymerization toners are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic powder.
Claim 11
Dependent Claim
29 words
The image forming method according to claim 8, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 12
Dependent Claim
51 words
The image forming method according to claim 7, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 13
Dependent Claim
80 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic polymerization toners and magnetic carriers, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier; and transferring said developed image on said latent image carrier to a sheet.
Claim 14
Dependent Claim
80 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic polymerization toners and magnetic carriers, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier; and transferring said developed image on said latent image carrier to a sheet.
Claim 15
Dependent Claim
37 words
The image forming method according to claim 11, wherein said magnetic polymerization toners used in said magnetic brush forming step are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic power.
Claim 16
Dependent Claim
29 words
The image forming method according to claim 12, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 17
Dependent Claim
51 words
The image forming method according to claim 12, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 18
Dependent Claim
119 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, by developer supplying means including a magnetic field generating member having a plurality of magnetic poles, provided in a rotatable sleeve, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set to near a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 19
Dependent Claim
119 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, by developer supplying means including a magnetic field generating member having a plurality of magnetic poles, provided in a rotatable sleeve, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set to near a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 20
Dependent Claim
118 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, by developer supplying means including a magnetic field generating member having a plurality of magnetic poles, provided in a rotatable sleeve, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set lower than a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 21
Dependent Claim
118 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic toners and magnetic carriers, by developer supplying means including a magnetic field generating member having a plurality of magnetic poles, provided in a rotatable sleeve, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier, a toner density of the developer in the formed magnetic brush being set lower than a limiting toner density; and transferring said developed image on said latent image carrier to a sheet.
Claim 22
Dependent Claim
101 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic polymerization toners and magnetic carriers, by developer supplying means including a magnetic field generating member having a plurality of magnetic poles, provided in a rotatable sleeve, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier; and transferring said developed image on said latent image carrier to a sheet.
Claim 23
Dependent Claim
101 words
An image forming method for forming an image on a sheet, comprising the steps of: forming an electrostatic latent image on a rotary endless latent image carrier; forming a magnetic brush with a developer, comprising magnetic polymerization toners and magnetic carriers, by developer supplying means including a magnetic field generating member having a plurality of magnetic poles, provided in a rotatable sleeve, in a developing area, for developing the electrostatic latent image on said latent image carrier, and thereby for collecting residual toners on said latent image carrier; and transferring said developed image on said latent image carrier to a sheet.
Claim 24
Dependent Claim
37 words
The image forming method according to claim 17, wherein said magnetic polymerization toners used in said magnetic brush forming step are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic powder.
Claim 25
Dependent Claim
29 words
The image forming method according to claim 18, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 26
Dependent Claim
51 words
The image forming method according to claim 17, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 27
Dependent Claim
146 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room, and a rotatable sleeve and a fixed magnetic roller provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer comprising magnetic toners and magnetic carriers in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier, a toner density of the developer in the developing room being set to near a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 28
Dependent Claim
146 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room, and a rotatable sleeve and a fixed magnetic roller provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer comprising magnetic toners and magnetic carriers in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier, a toner density of the developer in the developing room being set to near a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 29
Dependent Claim
37 words
The image forming apparatus according to claim 21, wherein said developing room retains magnetic carriers by which said toner density becomes near said limiting toner density with respect to a developer retaining volume of said developing room.
Claim 30
Dependent Claim
31 words
The image forming apparatus according to claim 21, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 31
Dependent Claim
146 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room, and a rotatable sleeve and a fixed magnetic roller provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer comprising magnetic toners and magnetic carriers in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier, a toner density of the developer in the developing room being set lower than a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 32
Dependent Claim
146 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room, and a rotatable sleeve and a fixed magnetic roller provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer comprising magnetic toners and magnetic carriers in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier, a toner density of the developer in the developing room being set lower than a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 33
Dependent Claim
31 words
The image forming apparatus according to claim 24, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 34
Dependent Claim
91 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means for forming a magnetic brush with a developer comprising magnetic polymerization toners and magnetic carriers in a developing room, for developing the electrostatic latent image on said latent image carrier, and for collection of residual toners on said latent image carrier; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 35
Dependent Claim
91 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means for forming a magnetic brush with a developer comprising magnetic polymerization toners and magnetic carriers in a developing room, for developing the electrostatic latent image on said latent image carrier, and for collection of residual toners on said latent image carrier; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 36
Dependent Claim
30 words
The image forming apparatus according to claim 26, wherein said magnetic polymerization toners are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic powder.
Claim 37
Dependent Claim
29 words
The image forming apparatus according to claim 27, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 38
Dependent Claim
51 words
The image forming apparatus according to claim 27, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 39
Dependent Claim
31 words
The image forming apparatus according to claim 26, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 40
Dependent Claim
170 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room for retaining a developer comprising magnetic toners and magnetic carriers, a toner supplying room for retaining magnetic toners to be supplied to the developing room, and magnetic brush forming means having a rotatable sleeve and a fixed magnetic roller provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier, a toner density of the developer in the developing room being set to near a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 41
Dependent Claim
170 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room for retaining a developer comprising magnetic toners and magnetic carriers, a toner supplying room for retaining magnetic toners to be supplied to the developing room, and magnetic brush forming means having a rotatable sleeve and a fixed magnetic roller provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier, a toner density of the developer in the developing room being set to near a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 42
Dependent Claim
37 words
The image forming apparatus according to claim 31, wherein said developing room retains magnetic carriers by which said toner density becomes near said limiting toner density with respect to a developer retaining volume of said developing room.
Claim 43
Dependent Claim
31 words
The image forming apparatus according to claim 31, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 44
Dependent Claim
37 words
The image forming apparatus according to claim 31, further comprising partitioning means for partitioning said developing room and said toner supplying room to prevent moving the magnetic carriers from said developing room to said toner supplying room.
Claim 45
Dependent Claim
170 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room for retaining a developer comprising magnetic toners and magnetic carriers, a toner supplying room for retaining magnetic toners to be supplied to the developing room, and magnetic brush forming means having a rotatable sleeve and a fixed magnetic roller provided in the sleeve having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collection of residual toners on said latent image carrier, a toner density of the developer in the developing room being set lower than a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 46
Dependent Claim
170 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room for retaining a developer comprising magnetic toners and magnetic carriers, a toner supplying room for retaining magnetic toners to be supplied to the developing room, and magnetic brush forming means having a rotatable sleeve and a fixed magnetic roller provided in the sleeve having a plurality of magnetic poles in a circumferential direction of the fixed magnetic roller in the developing room, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collection of residual toners on said latent image carrier, a toner density of the developer in the developing room being set lower than a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 47
Dependent Claim
31 words
The image forming apparatus according to claim 35, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 48
Dependent Claim
37 words
The image forming apparatus according to claim 35, further comprising partitioning means for partitioning said developing room and said toner supplying room to prevent moving the magnetic carriers from said developing room to said toner supplying room.
Claim 49
Dependent Claim
118 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room for retaining a developer comprising magnetic polymerization toners and magnetic carriers, and a toner supplying room for retaining the magnetic polymerization toners to be supplied to the developing room, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 50
Dependent Claim
118 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room for retaining a developer comprising magnetic polymerization toners and magnetic carriers, and a toner supplying room for retaining the magnetic polymerization toners to be supplied to the developing room, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 51
Dependent Claim
30 words
The image forming apparatus according to claim 38, wherein said magnetic polymerization toners are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic powder.
Claim 52
Dependent Claim
29 words
The image forming apparatus according to claim 39, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 53
Dependent Claim
51 words
The image forming apparatus according to claim 39, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 54
Dependent Claim
31 words
The image forming apparatus according to claim 38, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 55
Dependent Claim
37 words
The image forming apparatus according to claim 38, further comprising partitioning means for partitioning said developing room and said toner supplying room to prevent moving the magnetic carriers from said developing room to said toner supplying room.
Claim 56
Dependent Claim
133 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room retaining a developer comprising magnetic polymerization toners and magnetic carriers, and a developer supplying means including a rotatable sleeve and a magnetic field generating member provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the rotatable sleeve, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 57
Dependent Claim
133 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means including a developing room retaining a developer comprising magnetic polymerization toners and magnetic carriers, and a developer supplying means including a rotatable sleeve and a magnetic field generating member provided in the sleeve and having a plurality of magnetic poles in a circumferential direction of the rotatable sleeve, said developing means forming a magnetic brush with a developer in the developing room, for developing the electrostatic latent image on said latent image carrier, and for collecting residual toners on said latent image carrier; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 58
Dependent Claim
30 words
The image forming apparatus according to claim 44, wherein said magnetic polymerization toners are associated particles containing resin particles, prepared as an essential substance by emulsion polymerization, and magnetic powder.
Claim 59
Dependent Claim
29 words
The image forming apparatus according to claim 45, wherein said magnetic polymerization toners are prepared by aging a part of at least said resin particles in said associated particles.
Claim 60
Dependent Claim
51 words
The image forming apparatus according to claim 45, wherein said magnetic polymerization toners have a volume average particle size d, a density ρ and a specific surface area S in such a relation that 6/ρ·d·S lies in a range of 0.3 to 0.8 and d is between 5 to 12 μm.
Claim 61
Dependent Claim
31 words
The image forming apparatus according to claim 44, further comprising distribution means, provided between said transfer means and said image forming means, for distributing residual toners on said latent image carrier.
Claim 62
Dependent Claim
115 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means for forming a magnetic brush with a developer comprising magnetic toners and magnetic carriers in a developing room, for developing the electrostatic latent image on said latent image carrier with the magnetic brush, and for collecting residual toners on said latent image carrier with the magnetic brush, a toner density of the developer in the developing room being set lower than a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 63
Dependent Claim
115 words
An image forming apparatus for forming an image on a sheet, comprising: a rotary endless latent image carrier; image forming means for forming an electrostatic latent image on said latent image carrier; developing means for forming a magnetic brush with a developer comprising magnetic toners and magnetic carriers in a developing room, for developing the electrostatic latent image on said latent image carrier with the magnetic brush, and for collecting residual toners on said latent image carrier with the magnetic brush, a toner density of the developer in the developing room being set lower than a limiting toner density; and transfer means for transferring said developed image on said latent image carrier to a sheet.
Claim 64
Dependent Claim
37 words
The image forming apparatus according to claim 49, further comprising partitioning means for partitioning said developing room and a toner supplying room to prevent moving the magnetic carriers from said developing room to said toner supplying room.
Claim 65
Dependent Claim
30 words
The image forming apparatus according to claim 49, further comprising distribution means, provided between said transfer means and image forming means, for distributing residual toners on said latent image carrier.
Claim 66
Dependent Claim
16 words
The image forming apparatus according to claim 51, wherein said magnetic toners are magnetic polymerization toners.
Claim 67
Dependent Claim
37 words
The image forming apparatus according to claim 52, further comprising partitioning means for partitioning said developing room and a toner supplying room to prevent moving the magnetic carriers from said developing room to said toner supplying room.
References Cited (Backward Citations)
US4350750A
Cited
US4142165A
Cited
US4320958A
Cited
JPS59188656A
Cited
JPS60151685A
Cited
US5023666A
Cited
US4800147A
Cited
US5075729A
Cited
EP0354310A1
Cited
US5066982A
Cited
US5187525A
Cited
US5066989A
Cited
JPH03185463A
Cited
US5119138A
Cited
JPH04204856A
Cited
US5229825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-13 | 1999-05-15 | 1999-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-13 | 2003-05-15 | 2003-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-13 | 2007-05-15 | 2007-11-14 | $7700.00 | Window Closed / Lapsed |