US5351109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush for charging and cleaning an imaging surface
Assignee: Konica Minolta Inc
•
Filing: 1992-11-16
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Granted: 1994-09-27
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Expires: 2012-11-16
Abstract
Abstract Apparatus for charging an imaging surface of a photoreceptor. The apparatus forms a magnetic brush on a cylinder spaced apart from and facing the photoreceptor by a magnet disposed in the cylinder. The cylinder and the magnet are rotatable relative to each other so that the magnetic brush moves around the cylinder and comes in contact with the imaging surface of the photoreceptor. An electric bias source is provided to apply an electric bias voltage having a DC voltage component and an AC voltage component between the imaging surface of the photoreceptor and the cylinder, whereby the imaging surface is charged by the magnetic brush under the electric bias voltage.
Inventors
- 👤 Satoshi Haneda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0241; G03G21/00; G03G21/0005; G03G21/0047; G03G2215/00; G03G2215/02; G03G2215/021; G03G2215/022; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
66 words
An apparatus for charging an imaging surface of an image carrying member comprising a rotatable cylinder; a magnet in said cylinder member; a magnetic brush comprising spherical magnetic particles formed on said cylinder by a magnetic field generated by said magnet, and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 2
Independent Claim
66 words
An apparatus for charging an imaging surface of an image carrying member comprising a rotatable cylinder; a magnet in said cylinder member; a magnetic brush comprising spherical magnetic particles formed on said cylinder by a magnetic field generated by said magnet, and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1 wherein an electrical resistivity of said magnetic particles is from 10 5 to 10 12 Ωcm.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1 wherein a clearance between said cylinder member and said image carrying member is from 0.1 to 5 mm.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein a peak-to-peak value of said bias voltage is 200 to 3500 V.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1 wherein magnetization of said magnetic particles is 20 to 200 emu/g.
Claim 7
Independent Claim
84 words
A method of charging an imaging surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush comprising spherical magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 8
Independent Claim
84 words
A method of charging an imaging surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush comprising spherical magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 9
Dependent Claim
21 words
The method of claim 6 wherein an electrical resistivity of said magnetic particles is from 10 5 to 10 12 Ωcm.
Claim 10
Dependent Claim
24 words
The method of claim 6 wherein a clearance between said brush carrying member and said image carrying member is from 0.1 to 5 mm.
Claim 11
Dependent Claim
19 words
The method of claim 6 wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V.
Claim 12
Dependent Claim
18 words
The method of claim 6 wherein a magnetization of said magnetic particles is from 20 to 200 emu/g.
Claim 13
Independent Claim
97 words
A method of charging an image surface of an image carrying member, comprising the steps of: forming magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles having an electrical resistivity of 10 5 to 10 12 Ωcm by said magnetic field on said brush carrying member; bringing said magnetic brush in contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 14
Independent Claim
97 words
A method of charging an image surface of an image carrying member, comprising the steps of: forming magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles having an electrical resistivity of 10 5 to 10 12 Ωcm by said magnetic field on said brush carrying member; bringing said magnetic brush in contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 15
Dependent Claim
27 words
The method of claim 11 wherein the clearance between said brush carrying member and said image carrying member is within the range of 0.1 to 5 mm.
Claim 16
Dependent Claim
21 words
The method of claim 11 wherein the magnetization of said magnetic particles is within the range of 20 to 200 emu/g.
Claim 17
Independent Claim
91 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush comprising magnetic particles and formed on said cylinder by a magnetic field generated by said magnet; a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; and a device for controlling said bias voltage to reduce said DC voltage component of said bias voltage in order that said imaging surface not be charged.
Claim 18
Independent Claim
91 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush comprising magnetic particles and formed on said cylinder by a magnetic field generated by said magnet; a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; and a device for controlling said bias voltage to reduce said DC voltage component of said bias voltage in order that said imaging surface not be charged.
Claim 19
Dependent Claim
103 words
An image forming apparatus comprising: an image forming element comprising toner particles on an imaging surface of an image carrying member; a charger for charging said imaging surface of said image carrying member; said charging member comprising; a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of magnetic particles and formed on said cylinder by magnetic field generated by said magnet member; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein said toner particles are charged through frictional electrification with said magnetic particles.
Claim 20
Dependent Claim
103 words
An image forming apparatus comprising: an image forming element comprising toner particles on an imaging surface of an image carrying member; a charger for charging said imaging surface of said image carrying member; said charging member comprising; a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of magnetic particles and formed on said cylinder by magnetic field generated by said magnet member; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein said toner particles are charged through frictional electrification with said magnetic particles.
Claim 21
Dependent Claim
21 words
The apparatus of claim 15 further comprising a collecting roller for collecting said toner particles, which are conveyed to said charger.
Claim 22
Dependent Claim
21 words
The apparatus of claim 15 wherein said toner particles which are conveyed to said charger are transferred to said imaging surface.
Claim 23
Dependent Claim
24 words
The apparatus of claim 15 wherein a polarity of said DC voltage component is the same as frictional electrification polarity of said toner particles.
Claim 24
Dependent Claim
108 words
An image forming apparatus comprising: an image forming element comprising toner particles on an imaging surface of an image carrying member; a charger for charging said imaging surface of said image carrying member and cleaning said imaging surface; said charger comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush comprising magnetic particles and formed on said cylinder member by a magnetic field generated by said magnet member; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein said toner particles are charged through frictional electrification with said magnetic particles.
Claim 25
Dependent Claim
108 words
An image forming apparatus comprising: an image forming element comprising toner particles on an imaging surface of an image carrying member; a charger for charging said imaging surface of said image carrying member and cleaning said imaging surface; said charger comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush comprising magnetic particles and formed on said cylinder member by a magnetic field generated by said magnet member; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein said toner particles are charged through frictional electrification with said magnetic particles.
Claim 26
Dependent Claim
21 words
The apparatus of claim 19 further comprising a collecting roller for collecting said toner particles, which are conveyed to said charger.
Claim 27
Dependent Claim
22 words
The apparatus of claim 19 wherein said toner particles which are conveyed to said charging means are transferred to said imaging surface.
Claim 28
Dependent Claim
25 words
The apparatus of claim 19 wherein a polarity of said DC voltage component is the same as the frictional electrification polarity of said toner particles.
Claim 29
Independent Claim
115 words
A method of charging an imaging surface of an image carrying member comprising; forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V; and wherein an electrical resistivity of said magnetic particles is from 10 5 to 10 12 Ωcm.
Claim 30
Independent Claim
115 words
A method of charging an imaging surface of an image carrying member comprising; forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V; and wherein an electrical resistivity of said magnetic particles is from 10 5 to 10 12 Ωcm.
Claim 31
Independent Claim
121 words
A method of charging an imaging surface of an image carrying member comprising; forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V; and wherein a clearance between said brush carrying member and said image carrying member is within the range of 0.1 to 5 mm.
Claim 32
Independent Claim
121 words
A method of charging an imaging surface of an image carrying member comprising; forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V; and wherein a clearance between said brush carrying member and said image carrying member is within the range of 0.1 to 5 mm.
Claim 33
Independent Claim
115 words
A method of charging an imaging surface of an image carrying member comprising; forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V; and wherein the magnetization of said magnetic particles is within the range of 20 to 200 emu/G.
Claim 34
Independent Claim
115 words
A method of charging an imaging surface of an image carrying member comprising; forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles of said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said bias voltage is from 200 to 3500 V; and wherein the magnetization of said magnetic particles is within the range of 20 to 200 emu/G.
Claim 35
Independent Claim
105 words
An apparatus for charging an imaging surface of an image carrying member comprising a rotatable cylinder; a magnet having N and S poles in said cylinder; a magnetic brush comprising magnetic particles and formed on said cylinder by magnetic field generated by said magnet; a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; moving said poles so as to cause said magnetic field to be substantially parallel to said imaging surface whereby said magnetic brush comes out of contact with said imaging surface and said imaging surface is not charged.
Claim 36
Independent Claim
105 words
An apparatus for charging an imaging surface of an image carrying member comprising a rotatable cylinder; a magnet having N and S poles in said cylinder; a magnetic brush comprising magnetic particles and formed on said cylinder by magnetic field generated by said magnet; a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; moving said poles so as to cause said magnetic field to be substantially parallel to said imaging surface whereby said magnetic brush comes out of contact with said imaging surface and said imaging surface is not charged.
Claim 37
Independent Claim
96 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of magnetic particles formed on said cylinder by a magnetic field of said magnet, wherein an electrical resistivity of said magnetic particles is 10 5 to 10 12 Ωcm; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said AC voltage in said bias voltage is 200 to 3500 V.
Claim 38
Independent Claim
96 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of magnetic particles formed on said cylinder by a magnetic field of said magnet, wherein an electrical resistivity of said magnetic particles is 10 5 to 10 12 Ωcm; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said AC voltage in said bias voltage is 200 to 3500 V.
Claim 39
Independent Claim
97 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder, wherein clearance between said cylinder and said image carrying member is 0.1 to 5 mm; a magnet disposed in said cylinder; a magnetic brush composed of magnetic particles formed on said cylinder by a magnetic field of said magnet; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said AC voltage in said bias voltage is 200 to 3500 V.
Claim 40
Independent Claim
97 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder, wherein clearance between said cylinder and said image carrying member is 0.1 to 5 mm; a magnet disposed in said cylinder; a magnetic brush composed of magnetic particles formed on said cylinder by a magnetic field of said magnet; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said AC voltage in said bias voltage is 200 to 3500 V.
Claim 41
Independent Claim
94 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder; a magnet disposed in said cylinder; a magnetic brush composed of magnetic particles formed on said cylinder by a magnetic field of said magnet member, wherein magnetization of said magnetic particles is 20 to 200 emu/g; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said AC voltage in said bias voltage is 200 to 3500 v.
Claim 42
Independent Claim
94 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder; a magnet disposed in said cylinder; a magnetic brush composed of magnetic particles formed on said cylinder by a magnetic field of said magnet member, wherein magnetization of said magnetic particles is 20 to 200 emu/g; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; wherein a peak-to-peak value of said AC voltage in said bias voltage is 200 to 3500 v.
Claim 43
Independent Claim
77 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder; a magnet disposed in said cylinder; a magnetic brush composed of magnetic particles having an electrical resistivity of 10 5 to 10 12 Ωcm formed on said cylinder member by a magnetic field of said magnet; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 44
Independent Claim
77 words
An apparatus for charging an imaging surface of an image carrying member, comprising: a rotatable cylinder; a magnet disposed in said cylinder; a magnetic brush composed of magnetic particles having an electrical resistivity of 10 5 to 10 12 Ωcm formed on said cylinder member by a magnetic field of said magnet; and an applicator for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 45
Dependent Claim
21 words
The apparatus of claim 30 wherein a clearance between said cylinder and said image carrying member is 0.1 to 5 mm.
Claim 46
Dependent Claim
16 words
The apparatus of claim 30 wherein magnetization of said magnetic particles is 20 to 200 emu/g.
Claim 47
Independent Claim
77 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm and formed on said cylinder by a magnetic field generated by said magnet; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 48
Independent Claim
77 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm and formed on said cylinder by a magnetic field generated by said magnet; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 49
Independent Claim
87 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of magnetic particles having an average particle size of 30 to 100 μm and, having an electrical resistivity of 10 5 to 10 12 Ωcentimeters, formed on said cylinder by a magnetic field generated by said magnet; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 50
Independent Claim
87 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of magnetic particles having an average particle size of 30 to 100 μm and, having an electrical resistivity of 10 5 to 10 12 Ωcentimeters, formed on said cylinder by a magnetic field generated by said magnet; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 51
Independent Claim
92 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm and formed on said cylinder by a magnetic field generated by said magnet; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; a clearance between said cylinder and said image copying member is 0.1 to 5 mm.
Claim 52
Independent Claim
92 words
An apparatus for charging an image surface of an image carrying member comprising: a rotatable cylinder; a magnet in said cylinder; a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm and formed on said cylinder by a magnetic field generated by said magnet; and a bias for applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; a clearance between said cylinder and said image copying member is 0.1 to 5 mm.
Claim 53
Independent Claim
95 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 54
Independent Claim
95 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 55
Independent Claim
108 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member, said magnetic particles having an electrical resistivity of 10 5 to 10 12 Ωcentimeters; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 56
Independent Claim
108 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member, said magnetic particles having an electrical resistivity of 10 5 to 10 12 Ωcentimeters; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 57
Independent Claim
111 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; a clearance between said brush carrying member and said image carrying member is 0.1 to 5 mm.
Claim 58
Independent Claim
111 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component; a clearance between said brush carrying member and said image carrying member is 0.1 to 5 mm.
Claim 59
Independent Claim
106 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member, a magnetization of said magnetic particles being 20 to 200 emu/g; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
Claim 60
Independent Claim
106 words
A method of charging an image surface of an image carrying member comprising: forming a magnetic field on a brush carrying member; forming a magnetic brush composed of spherical magnetic particles having an average particle size of 30 to 100 μm by said magnetic field on said brush carrying member, a magnetization of said magnetic particles being 20 to 200 emu/g; bringing said magnetic brush into contact with said imaging surface of said image carrying member; moving said magnetic particles composing said magnetic brush; and applying a bias voltage to said magnetic brush, said bias voltage comprising a DC voltage component and an AC voltage component.
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