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US 10,852,661 B2Granted
Developing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTomoyuki Sakamaki, Mitsuhiro Furukawa
Life of this patent
Estimating the term…
Abstract
A developing apparatus includes a sleeve for carrying a developer including toner and magnetic carrier, the sleeve having a plurality of grooves extending in a longitudinal direction; a magnet provided inside the sleeve, a non-magnetic regulating member, provided spaced from the sleeve, wherein an amount M/S (mg/mm2) of the developer carried on a unit area of the sleeve after passing by the regulating member, a gap SB (mm) between a free end of the regulating member and the sleeve, a density G (mg/mm3) of the developer, and a groove ratio α which is a ratio of the grooves in the surface of the sleeve satisfy, 0.1≤M/S (mg/mm2)≤0.5, 0.2≤SB (mm), and m/S (mg/mm2)×1/4≤α×{SB (mm)+D (mm)}×G (mg/mm3)<M/S (mg/mm2).
Claims55
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm),
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developing carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, and a groove ratio a which is a ratio of said grooves in said developer carrying surface satisfy,
- 0.1≤M/S (mg/mm2)≤0.5,
- 0.2≤SB (mm), and
- M/S (mg/mm2)×1/4≤α×{SB (mm)+D (mm)}×G (mg/mm3)<M/S (mg/mm2).
8 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm),
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developer carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface;
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, and a groove ratio a which is a ratio of said grooves in said developer carrying surface satisfy,
- 0.1≤M/S (mg/mm2)≤0.5,
- 0.2≤SB (mm), and
- 0.06<α<0.229.
8 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm),
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developer carrying surface;
- and
- a non-magnetic regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface, and
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, and a groove ratio a which is a ratio of said grooves in said developer carrying surface satisfy,
- 0.1≤M/S (mg/mm2)≤0.5,
- 0.2≤SB (mm), and
- M/S (mg/mm2)×1/4≤α×{SB (mm)+D (mm)}×G (mg/mm3)<M/S (mg/mm2)×23/30,
- and 0.06<α<0.229.
9 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm),
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developer carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying r surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, a groove ratio a which is a ratio of said grooves in said developer carrying surface, and
- wherein a volume V (mm3) between a first area in a unit area, 10 mm ×10 mm, of said developer carrying surface and a second area opposed to the first area in an imaginary cylindrical surface of an imaginary cylinder which is concentric with said developer carrying member and which has a diameter of r (mm)+SB (mm), where r is a radius of said developer carrying member satisfy,
- 0.1≤M/S (mg/mm2)≤0.5,
- 0.2≤SB (mm), and
- M/S (mg/mm2)×1/4≤α×V (mm3)×G (mg/mm3)/(10 mm×10 mm)<M/S (mg/mm2).
9 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm)
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developer carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, a groove ratio a which is a ratio of said grooves in said developer carrying surface, and
- wherein a volume V0 (mm3) between a first area in an entire developer carrying surface and a second area opposed to the first area in an imaginary cylindrical surface of an imaginary cylinder which is concentric with said developer carrying member and which has a diameter of r (mm) +SB (mm), where r is a radius of said developer carrying member, and an area Ao (mm2) of the entire said developer carrying surface satisfy,
- M/S (mg/mm2)×1/4≤α×V0 (mm3)×G (mg/mm3)/ A0 (mm2)<M/S (mg/mm2).
7 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein said groove has such a size that more than one half of an imaginary ball having a diameter of D50 (mm) is in the groove where D50 is a volume average particle diameter of the magnetic carrier,
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developer carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, a groove ratio a which is a ratio of said grooves in said developer carrying surface, and
- wherein a volume V (mm3) between a first area in a unit area, 10 mm ×10 mm, in said developer carrying surface and a second area opposed to the first area in an imaginary cylindrical surface of an imaginary cylinder which is concentric with said developer carrying member and which has a diameter of r (mm) +SB (mm), where r is a radius of said developer carrying member satisfy,
- 0.1≤M/S (mg/mm2)≤0.5,
- 0.2≤SB (mm), and
- M/S (mg/mm2)×1/4≤α×V (mm3)×G (mg/mm3)/(10 mm×10 mm)<M/S (mg/mm2).
7 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm)
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developing carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, and a groove ratio a which is a ratio of said grooves in said developer carrying surface satisfy,
- M/S (mg/mm2)≤0.5, and
- M/S (mg/mm2)×1/4≤α×{SB (mm)×D(mm)}×G(mg/mm3 )<M/S(mg/mm2).
7 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm),
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developing carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface,
- wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, and a groove ratio a which is a ratio of said grooves in said developer carrying surface satisfy,
- 0.1≤M/S (mg/mm2)≤0.45,
- M/S (mg/mm2)×1/4≤α×{SB (mm)+D(mm)}×G (mg/mm3)<23/30×M/S (mg/mm2), and
- 0.06<α<0.229.
8 more elements
A developing apparatus comprising:
- a developer carrying member configured to carry a developer including toner and magnetic carrier to develop a latent image formed on an image bearing member, said developer carrying member including a developer carrying surface having a plurality of grooves;
- wherein a depth D (mm) of said grooves, a width W (mm) of said grooves, and a volume average particle diameter of the magnetic carrier D50 (mm) satisfy,
- D (mm)>D50 (mm)×1/2, and
- W (mm)>D50 (mm),
- a magnet, provided inside said developer carrying member, configured to attract the developer on said developing carrying surface;
- and
- a regulating member, provided spaced from said developer carrying member, configured to regulate an amount of the developer carried on said developer carrying surface, wherein an amount M/S (mg/mm2) of the developer carried on a unit area of said developer carrying surface after passing by said regulating member, a gap SB (mm) between a free end of said regulating member and said developer carrying member, a density G (mg/mm3) of the developer, and a groove ratio α which is a ratio of said grooves in said developer carrying surface satisfy,
- 0.1≤M/S (mg/mm2)≤0.45, and
- 0.06<α<0.229.
6 more elements
Dependencies are inferred from the claim text.