US5164774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing device of the type forming thin layer of toner on toner conveying member, and dry color toner of one component type used therein
Assignee: Ricoh Co Ltd
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Filing: 1988-12-13
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Granted: 1992-11-17
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Expires: 2008-12-13
Abstract
Abstract In a developing device and a dry color toner for color electrophotography. The developing device is provided with a toner conveying member and a toner layer thickness controlling member which is in contact with the toner conveying member. The color toner for developing electrostatic images used in this developing device has the following relation between the number average particle diameter and the volume average particle diameter: ##EQU1## Even after a continuous copying, the developing device and the color toner provide substantially the same image quality as that in the earlier stages of the continuous copying.
Inventors
- 👤 Masami Tomita
- 👤 Hachiro Tosaka
- 👤 Motoi Orihara
- 👤 Hiroshi Tanaka
- 👤 Tomoe Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:33
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819; G03G13/00; G03G13/01; G03G13/013; G03G13/0133; G03G13/06; G03G13/08; G03G9/097; G03G9/09708; G03G9/09725; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
73 words
A dry color toner used in a developing device provided with a toner conveying member and a member disposed in contact with the toner conveying member for controlling thickness of a toner layer on the toner conveying member, the color toner being of such one component type as to contain no carrier particles, the color toner having the following relation between the number average particle diameter and the volume average particle diameter: ##EQU2##
Claim 2
Dependent Claim
73 words
A dry color toner used in a developing device provided with a toner conveying member and a member disposed in contact with the toner conveying member for controlling thickness of a toner layer on the toner conveying member, the color toner being of such one component type as to contain no carrier particles, the color toner having the following relation between the number average particle diameter and the volume average particle diameter: ##EQU2##
Claim 3
Dependent Claim
24 words
A color toner according to claim 1, in which the volume average particle diameter of the color toner ranges from 3 to 25 μm.
Claim 4
Dependent Claim
34 words
A color toner according to claim 2, in which the color toner comprises 3 to 8 parts by weight of a coloring agent and 92 to 97 parts by weight of a binding agent.
Claim 5
Dependent Claim
45 words
A color toner according to claim 3, in which the color. toner is coated on surfaces of particles thereof with inorganic fine powders in the proportion of 2.7 parts by weight of the inorganic fine powders to 100 parts by weight of the color toner.
Claim 6
Dependent Claim
33 words
A color toner according to claim 4, in which the inorganic fine powders comprise fine powders of silicon carbide having a volume average particle diameter of 2.0 μm and fine powders of silica.
Claim 7
Dependent Claim
16 words
A color toner according to claim 3, in which the binding agent comprises a binding resin.
Claim 8
Dependent Claim
29 words
A color toner according to claim 6, in which the binding resin comprises substantially 90 parts by weight of styrene-n-butylmethacrylate copolymer and 10 parts by weight of styrene-dimethylaminomethacrylate copolymer.
Claim 9
Dependent Claim
17 words
A color toner according to claim 3, in which the coloring agent comprises a yellow coloring agent.
Claim 10
Dependent Claim
17 words
A color toner according to claim 3, in which the coloring agent comprises a magenta coloring agent.
Claim 11
Dependent Claim
17 words
A color toner according to claim 3, in which the coloring agent comprises a cyan coloring agent.
Claim 12
Dependent Claim
87 words
Dry color toners of at least yellow, magenta and cyan colors used in developing devices corresponding to the respective color toners and provided respectively with a toner conveying member and a member disposed in contact with the toner conveying member for controlling thickness of a toner layer on the toner conveying member, the color toners being of such one component type as to contain no carrier particles, the color toners having the following relation between the number average particle diameter and the volume average particle diameter; ##EQU3##
Claim 13
Dependent Claim
87 words
Dry color toners of at least yellow, magenta and cyan colors used in developing devices corresponding to the respective color toners and provided respectively with a toner conveying member and a member disposed in contact with the toner conveying member for controlling thickness of a toner layer on the toner conveying member, the color toners being of such one component type as to contain no carrier particles, the color toners having the following relation between the number average particle diameter and the volume average particle diameter; ##EQU3##
Claim 14
Dependent Claim
23 words
Color toners according to claim 11, in which the volume average particle diameters of the color toners range from 3 to 25 μm.
Claim 15
Dependent Claim
33 words
Color toners according to claim 12 in which the color toners comprise 3 to 8 parts by weight of a coloring agent and 92 to 97 parts by weight of a binding agent.
Claim 16
Dependent Claim
44 words
Color toners according to claim 13, in which the color toner is coated on surfaces of particles thereof with inorganic fine powders in the proportion of 2.7 parts by weight of the inorganic fine powders to 100 parts by weight of the color toner.
Claim 17
Dependent Claim
32 words
Color toners according to claim 14, in which the inorganic fine powders comprise fine powders of silicon carbide having a volume average particle diameter of 2.0 μm and fine powders of silica.
Claim 18
Dependent Claim
15 words
Color toners according to claim 13, in which the binding agent comprises a binding resin.
Claim 19
Dependent Claim
28 words
Color toners according to claim 16, in which the binding resin comprises substantially 90 parts by weight of styrene-n-butylmethacrylate copolymer and 10 parts by weight of styrene-dimethylaminomethacrylate copolymer.
Claim 20
Dependent Claim
114 words
A developing device for electrophotography, comprising an electrostatic image carrier member, a toner conveying member situated in close vicinity to the electrostatic image carrier member so as to convey a toner to the image carrier member, and a toner layer thickness controlling member which is so constructed as to form a thin layer of the toner on a surface of the conveying member by pressing the toner supplied to the conveying member against the surface of the conveying member, the toner being of such one component type as to contain no carrier particles, the toner exhibiting the following relation between the number average particle diameter thereof and the volume average particle diameter thereof: ##EQU4##
Claim 21
Dependent Claim
114 words
A developing device for electrophotography, comprising an electrostatic image carrier member, a toner conveying member situated in close vicinity to the electrostatic image carrier member so as to convey a toner to the image carrier member, and a toner layer thickness controlling member which is so constructed as to form a thin layer of the toner on a surface of the conveying member by pressing the toner supplied to the conveying member against the surface of the conveying member, the toner being of such one component type as to contain no carrier particles, the toner exhibiting the following relation between the number average particle diameter thereof and the volume average particle diameter thereof: ##EQU4##
Claim 22
Dependent Claim
22 words
A developing device according to claim 18, in which the toner has the volume average particle diameter of 3 to 25 μm.
Claim 23
Dependent Claim
33 words
A developing device according to claim 18, in which the toner comprises one sort of color toner selected from a group consisting of a yellow toner, a magenta toner, and a cyan toner.
Claim 24
Dependent Claim
77 words
A developing device according to claim 18, in which the electrostatic image carrier member comprises a rotatably arranged cylindrical drum, the toner conveying member comprises a cylindrical roller rotatably arranged in close vicinity to the cylindrical drum and in parallel with an axis of the cylindrical drum, the toner layer thickness controlling member comprising a doctor blade arranged in parallel with an axis of the cylindrical roller and in contact with a surface of the cylindrical roller.
Claim 25
Dependent Claim
154 words
A developing device for color electrophotography, comprising an electrostatic image carrier member and at least three developing means spaced apart from each other and in close vicinity to said electrostatic image carrier member for respectively containing at least yellow, magenta, and cyan toners, each of the developing means being provided with a toner conveying member arranged in close vicinity to the electrostatic image carrier member so as to convey a color toner contained in corresponding developing means to the image carrier member and a toner layer thickness controlling member which is so constructed as to form a thin layer of the color toner on a surface of the toner conveying member against the surface of the toner conveying member, the color toner being of such one component type as to contain no carrier particles, the color toner exhibiting the following relation between the number average particle diameter and the volume average particle diameter: ##EQU5##
Claim 26
Dependent Claim
154 words
A developing device for color electrophotography, comprising an electrostatic image carrier member and at least three developing means spaced apart from each other and in close vicinity to said electrostatic image carrier member for respectively containing at least yellow, magenta, and cyan toners, each of the developing means being provided with a toner conveying member arranged in close vicinity to the electrostatic image carrier member so as to convey a color toner contained in corresponding developing means to the image carrier member and a toner layer thickness controlling member which is so constructed as to form a thin layer of the color toner on a surface of the toner conveying member against the surface of the toner conveying member, the color toner being of such one component type as to contain no carrier particles, the color toner exhibiting the following relation between the number average particle diameter and the volume average particle diameter: ##EQU5##
Claim 27
Dependent Claim
23 words
A developing device according to claim 22, in which the color toner has the volume average particle diameter of 3 to 25 μm.
Claim 28
Dependent Claim
78 words
A developing device according to claim 22, in which the electrostatic image carrier member comprises a rotatably arranged cylindrical drum, the toner conveying member comprises a cylindrical roller rotatably arranged in parallel with an axis of the cylindrical drum and in close vicinity to the cylindrical drum, the color toner layer thickness controlling member comprising a doctor blade arranged in parallel with an axis of the cylindrical roller and in contact with a surface of the cylindrical roller.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |