EP0677794A2
Expired / Lapsed
EP
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Image forming method and process cartridge
Assignee: Canon Inc
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Filing: 1995-04-12
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Granted: —
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Expires: 2015-04-12
Abstract
Abstract An image forming method which comprises, forming an electrostatic latent image on an image bearing member having a surface of which contact angle with water is at least 90°, forming a toner layer on a toner carrying member, bringing the toner layer into contact with the surface of the image bearing member on which the electrostatic latent image has been formed, while rotating the image bearing member and the toner carrying member reciprocally, and developing the electrostatic latent image by the use of the toner of the toner layer to form a toner image.
Inventors
- 👤 Shuichi C/O Canon K.K. Aita
- 👤 Toshiyuki C/O Canon K.K. Yoshihara
- 👤 Motoo C/O Canon K.K. Urawa
- 👤 Tsutomu C/O Canon K.K. Kukimoto
- 👤 Yoshifumi C/O Canon K.K. Hano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G13/00; G03G13/06; G03G13/08; G03G5/00; G03G5/005; G03G5/14; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14717; G03G5/14726; G03G9/00; G03G9/08; G03G9/0819; G03G9/0821; G03G9/0823; G03G9/097; G03G9/09708; G03G2221/00; G03G2221/16; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
93 words
An image forming method comprising; forming an electrostatic latent image on an image bearing member having a surface of which contact angle with water is at least 90°; forming a toner layer on a toner carrying member; bringing the toner layer into contact with the surface of the image bearing member on which the electrostatic latent image has been formed, while rotating the image bearing member and the toner carrying member reciprocally; and developing the electrostatic latent image by the use of the toner of the toner layer to form a toner image.
Claim 2
Dependent Claim
25 words
The image forming method according to claim 1, wherein said image bearing member contains in its surface layer a releasing powder having a fluorine atom.
Claim 3
Dependent Claim
22 words
The image forming method according to claim 2, wherein said image bearing member contains in its surface layer a fluorine resin powder.
Claim 4
Dependent Claim
21 words
The image forming method according to claim 3, wherein said image bearing member contains in its surface layer a polytetrafluoroethylene powder.
Claim 5
Dependent Claim
21 words
The image forming method according to claim 1, wherein said image bearing member is electrostatically charged by a contact charging means.
Claim 6
Dependent Claim
87 words
The image forming method according to claim 1, wherein said toner contains at least toner particles having a binder resin and a colorant and an inorganic powder, and said toner has a volume average particle diameter Dv (µm) of 3 µm ≦ Dv ≦ 8 µm, a weight average particle diameter D₄ (µm) of 3.5 ≦ D₄ ≦ 9, and a percentage Nr of particles of diameters not larger than 5 µm in number particle size distribution, of 17% by number ≦ Nr ≦ 90% by number.
Claim 7
Dependent Claim
70 words
The image forming method according to claim 6, wherein said toner has a volume average particle diameter Dv (µm) of 3 µm ≦ Dv ≦ 6 µm, a weight average particle diameter D₄ (µm) of 3.5 µm ≦ D₄ < 6.5 µm, and a percentage Nr of particles with diameters not larger than 5 µm in number particle size distribution, of 60% by number ≦ Nr ≦ 90% by number.
Claim 8
Dependent Claim
80 words
The image forming method according to claim 6, wherein said toner has the ratio of percentage Nm of particles with diameters not larger than 3.17 µm in number particle size distribution to percentage Nv of particles with diameters not larger than 3.17 µm in volume particle size distribution, Nm/Nv, of from 2.0 to 8.0, and a volume percentage of toner particles with diameters not smaller than 8 µm in volume particle size distribution, of not more than 10% by volume.
Claim 9
Dependent Claim
54 words
The image forming method according to claim 6, wherein said toner has the ratio of percentage Nm of particles with diameters not larger than 3.17 µm in number particle size distribution to percentage Nv of particles with diameters not larger than 3.17 µm in volume particle size distribution, Nm/Nv, of from 3.0 to 7.0.
Claim 10
Dependent Claim
30 words
The image forming method according to claim 6, wherein said inorganic fine powder is selected from the group consisting of titania, alumina silica and composite oxides of any of these.
Claim 11
Dependent Claim
38 words
The image forming method according to claim 1, wherein said toner has a charge quantity as its absolute value (mC/kg) of 14 ≦ Q ≦ 80 mC/kg (µC/g), where Q is a quantity of triboelectricity to iron powder.
Claim 12
Dependent Claim
24 words
The image forming method according to claim 11, wherein said absolute value (mC/kg) of charge quantity is 24 ≦ Q ≦ 60 mC/kg (µC/g).
Claim 13
Dependent Claim
32 words
The image forming method according to claim 1, wherein said toner carrying member is rotated at a peripheral speed of 100% or more of the peripheral speed of said image bearing member.
Claim 14
Dependent Claim
33 words
The image forming method according to claim 13, wherein said toner carrying member is rotated at a peripheral speed of from 120% to 300% of the peripheral speed of said image bearing member.
Claim 15
Dependent Claim
33 words
The image forming method according to claim 14, wherein said toner carrying member is rotated at a peripheral speed of from 140% to 250% of the peripheral speed of said image bearing member.
Claim 16
Dependent Claim
27 words
The image forming method according to claim 1, wherein said toner is applied on the toner carrying member in thin layer of not more than two layers.
Claim 17
Dependent Claim
62 words
The image forming method according to claim 1, wherein said toner carrying member carries the toner in a developing zone in a quantity of from 0.4 × D × ρ to 1.1 × D × ρ (g/m²) per unit area, where D represents a weight average particle diameter (µm) of the toner and ρ represents a true density (g/cm³) of the toner.
Claim 18
Dependent Claim
35 words
The image forming method according to claim 17, wherein said toner is carried on said toner carrying member in a quantity of from 0.5 × D × ρ to 1.0 × D × ρ (g/m²).
Claim 19
Dependent Claim
35 words
The image forming method according to claim 18, wherein said toner is carried on said toner carrying member in a quantity of from 0.6 × D × ρ to 0.95 × D × ρ (g/m²).
Claim 20
Dependent Claim
114 words
A process cartridge comprising a developing means and an image bearing member for bearing an electrostatic latent image; said developing means and said image bearing member being held into one unit as a cartridge; and said process cartridge being detachable from the main body of an image forming apparatus, wherein; said image bearing member has a surface of which contact angle with water is at least 90°; and said developing means has a toner and a toner carrying member and is so provided as to be able to develop the electrostatic latent image while a toner layer formed on the toner carrying member comes into contact with the surface of the image bearing member.
Claim 21
Dependent Claim
24 words
The process cartridge according to claim 20, wherein said image bearing member contains in its surface layer a releasing powder having a fluorine atom.
Claim 22
Dependent Claim
21 words
The process cartridge according to claim 21, wherein said image bearing member contains in its surface layer a fluorine resin powder.
Claim 23
Dependent Claim
20 words
The process cartridge according to claim 22, wherein said image bearing member contains in its surface layer a polytetrafluoroethylene powder.
Claim 24
Dependent Claim
21 words
The process cartridge according to claim 20, wherein said image bearing member is in pressure contact with a contact charging means.
Claim 25
Dependent Claim
88 words
The process cartridge according to claim 20, wherein said toner contains at least toner particles having a binder resin and a colorant and an inorganic powder, and said toner has a volume average particle diameter Dv (µm) of 3 µm ≦ Dv ≦ 8 µm, a weight average particle diameter D₄ (µm) of 3.5 µm ≦ D₄ ≦ 9 µm, and a percentage Nr of particles with diameters not larger than 5 µm in number particle size distribution, of 17% by number ≦ Nr ≦ 90% by number.
Claim 26
Dependent Claim
69 words
The process cartridge according to claim 25, wherein said toner has a volume average particle diameter Dv (µm) of 3 µm ≦ Dv ≦ 6 µm, a weight average particle diameter D₄ (µm) of 3.5 µm ≦ D₄ ≦ 6.5 µm, and a percentage Nr of particles with diameters not larger than 5 µm in number particle size distribution, of 60% by number ≦ Nr ≦ 90% by number.
Claim 27
Dependent Claim
79 words
The process cartridge according to claim 25, wherein said toner has the ratio of percentage Nm of particles with diameters not larger than 3.17 µm in number particle size distribution to percentage Nv of particles with diameters not larger than 3.17 µm in volume particle size distribution, Nm/Nv, of from 2.0 to 8.0, and a volume percentage of toner particles with diameters not smaller than 8 µm in volume particle size distribution, of not more than 10% by volume.
Claim 28
Dependent Claim
53 words
The process cartridge according to claim 25, wherein said toner has the ratio of percentage Nm of particles with diameters not larger than 3.17 µm in number particle size distribution to percentage Nv of particles with diameters not larger than 3.17 µm in volume particle size distribution, Nm/Nv, of from 3.0 to 7.0.
Claim 29
Dependent Claim
29 words
The process cartridge according to claim 25, wherein said inorganic fine powder is selected from the group consisting of titania, alumina silica and composite oxides of any of these.
Claim 30
Dependent Claim
37 words
The process cartridge according to claim 20, wherein said toner has a charge quantity as its absolute value (mC/kg) of 14 ≦ Q ≦ 80 mC/kg (µC/g), where Q is a quantity of triboelectricity to iron powder.
Claim 31
Dependent Claim
23 words
The process cartridge according to claim 30, wherein said absolute value (mC/kg) of charge quantity is 24 ≦ Q ≦ 60 mC/kg (µC/g).
Claim 32
Dependent Claim
26 words
The process cartridge according to claim 20, wherein said toner is applied on the toner carrying member in thin layer of not more than two layers.
Claim 33
Dependent Claim
61 words
The process cartridge according to claim 20, wherein said toner carrying member carries the toner in a developing zone in a quantity of from 0.4 × D × ρ to 1.1 × D × ρ (g/m²) per unit area, where D represents a weight average particle diameter (µm) of the toner and ρ represents a true density (g/cm³) of the toner.
Claim 34
Dependent Claim
34 words
The process cartridge according to claim 33, wherein said toner is carried on said toner carrying member in a quantity of from 0.5 × D × ρ to 1.0 × D × ρ (g/m²).
Claim 35
Dependent Claim
33 words
The process cartridge according to claim 34, wherein said toner is carried on said toner carrying member in a quantity of from 0.6 × D × ρ to 0.95 × D × ρ(g/m²).
References Cited (Backward Citations)
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