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US4989044A
Expired / Lapsed
US
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Developing apparatus for developing electrostatic latent images
Assignee: Canon Inc
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Filing: 1989-04-21
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Granted: 1991-01-29
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Expires: 2009-04-21
Abstract
Abstract A developing apparatus using one component developer includes a developing sleeve for carrying the developer to a developing zone. The developing sleeve has an outer coating layer made of resin material in which electrically conductive fine particles are dispersed.
Inventors
- 👤 Katsuhiko Nishimura
- 👤 Michihito Yamazaki
- 👤 Keiji Okano
- 👤 Motoi Katoh
- 👤 Kouichi Suwa
- 👤 Yasushi Sato
- 👤 Kimio Nakahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:06
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/18; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
183 words
A developing apparatus for developing an electrostatic latent image, comprising: a movable developer carrying member for carrying one component developer to a developing zone where said developer carrying member is opposed to a latent image bearing member for carrying the electrostatic latent image, said developer carrying member being effective to triboelectrically charge the developer to a polarity for developing the latent image; a regulating member for regulating a thickness of a layer of the developer on said developer carrying member to a thickness smaller than a minimum clearance between said developer carrying member and the image bearing member; and a voltage source for applying a developing bias voltage to said developer carrying member to transfer the developer from said developer carrying member to said image bearing member; wherein said carrying member is provided with an outer layer of resin material in which fine conductive particles containing fine carbon particles and fine graphite particles are dispersed, and wherein secondary particles formed by the resin material and the fine conductive particles are distributed at a surface of the outer layer to form a rough surface.
Claim 2
Dependent Claim
183 words
A developing apparatus for developing an electrostatic latent image, comprising: a movable developer carrying member for carrying one component developer to a developing zone where said developer carrying member is opposed to a latent image bearing member for carrying the electrostatic latent image, said developer carrying member being effective to triboelectrically charge the developer to a polarity for developing the latent image; a regulating member for regulating a thickness of a layer of the developer on said developer carrying member to a thickness smaller than a minimum clearance between said developer carrying member and the image bearing member; and a voltage source for applying a developing bias voltage to said developer carrying member to transfer the developer from said developer carrying member to said image bearing member; wherein said carrying member is provided with an outer layer of resin material in which fine conductive particles containing fine carbon particles and fine graphite particles are dispersed, and wherein secondary particles formed by the resin material and the fine conductive particles are distributed at a surface of the outer layer to form a rough surface.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1, wherein the coating layer has an average volume resistivity of 10 -3 -10 2 ohm.cm and has a thickness of 0.5-30 microns.
Claim 4
Dependent Claim
20 words
An apparatus according to claim 2, wherein the secondary particles have a particle size of not more than 1.0 micron.
Claim 5
Dependent Claim
22 words
An apparatus according to claim 1 or 2, wherein said voltage source applies an alternating bias voltage to said developer carrying member.
Claim 6
Dependent Claim
16 words
An apparatus according to claim 1 or 2, wherein the resin material is a phenol resin.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 1 or 2, wherein said regulating member is in contact with said developer carrying member.
Claim 8
Dependent Claim
14 words
An apparatus according to claim 6, wherein said regulating member includes an elastic plate.
Claim 9
Dependent Claim
58 words
An apparatus according to claim 1 or 2, further comprising a stationary magnet disposed in said developer carrying member, wherein said developer carrying member carries the one component magnetic developer, and said regulating member includes a ferromagnetic member disposed within the influence of a magnetic field formed by said magnet with a clearance from said developer carrying member.
Claim 10
Dependent Claim
23 words
An apparatus according to any one of claim 1, wherein said voltage source applies a DC bias voltage to said developer carrying member.
Claim 11
Dependent Claim
147 words
A developing apparatus for developing an electrostatic latent image, comprising: a movable developer carrying member for carrying one component developer to a developing zone where said developer carrying member is opposed to a latent image bearing member for carrying the electrostatic latent image, said developer carrying member being effective to triboelectrically charge the developer to a polarity for developing the latent image; a regulating member for regulating a thickness of a layer of the developer on said developer carrying member to a thickness smaller than a minimum clearance between said developer carrying member and the image bearing member; and a voltage source for applying a developing bias voltage to said developer carrying member to transfer the developer from said developer carrying member to said image bearing member; wherein said developer carrying member has an outer coating layer of resin material in which fine graphite particles are dispersed.
Claim 12
Dependent Claim
147 words
A developing apparatus for developing an electrostatic latent image, comprising: a movable developer carrying member for carrying one component developer to a developing zone where said developer carrying member is opposed to a latent image bearing member for carrying the electrostatic latent image, said developer carrying member being effective to triboelectrically charge the developer to a polarity for developing the latent image; a regulating member for regulating a thickness of a layer of the developer on said developer carrying member to a thickness smaller than a minimum clearance between said developer carrying member and the image bearing member; and a voltage source for applying a developing bias voltage to said developer carrying member to transfer the developer from said developer carrying member to said image bearing member; wherein said developer carrying member has an outer coating layer of resin material in which fine graphite particles are dispersed.
Claim 13
Dependent Claim
17 words
An apparatus according to claim 10, wherein fine carbon particles are further dispersed in the resin material.
Claim 14
Dependent Claim
21 words
An apparatus according to claim 11, wherein the coating layer has an average volume resistivity of 10 -3 -10 2 ohm.cm.
Claim 15
Dependent Claim
16 words
An apparatus according to claim 12, wherein the coating layer has a thickness of 0.5-30 microns.
Claim 16
Dependent Claim
23 words
An apparatus according to any one of claim 10 wherein said voltage source applies an alternating bias voltage to said developer carrying member.
Claim 17
Independent Claim
24 words
An apparatus according to any one of claims 10-13, wherein said voltage source applies to a DC bias voltage to said developer carrying member.
Claim 18
Independent Claim
17 words
An apparatus according to any one of claims 10-13, wherein the resin material is a phenol resin.
Claim 19
Independent Claim
21 words
An apparatus according to any one of claims 10-13, wherein said regulating member is in contact with said developer carrying member.
Claim 20
Dependent Claim
14 words
An apparatus according to claim 17, wherein said regulating member includes an elastic plate.
Claim 21
Independent Claim
59 words
An apparatus according to any one of claims 10-13, further comprising a stationary magnet disposed in said developer carrying member, wherein said developer carrying member carries the one component magnetic developer, and said regulating member includes a ferromagnetic member disposed within the influence of a magnetic field formed by said magnet with a clearance from said developer carrying member.
Claim 22
Dependent Claim
158 words
A developing apparatus for developing an electrostatic latent image, comprising: a movable developer carrying member for carrying one component developer, which contains toner to which negatively chargeable hydrophobic silica has been added, to a developing zone where said developer carrying member is opposed to a latent image bearing member for carrying the electrostatic latent image, said developer carrying member being effective to charge the toner to a negative polarity; a regulating member of regulating the thickness of a layer of the developer on said developer carrying member to a thickness smaller than a minimum clearance between said developer carrying member and the image bearing member; and a voltage source for applying a developing bias voltage to said developer carrying member to transfer the toner from said developer carrying member to said image bearing member; wherein said developer carrying member has an outer coating layer of resin material in which fine carbon particles and fine graphite particles are dispersed.
Claim 23
Dependent Claim
158 words
A developing apparatus for developing an electrostatic latent image, comprising: a movable developer carrying member for carrying one component developer, which contains toner to which negatively chargeable hydrophobic silica has been added, to a developing zone where said developer carrying member is opposed to a latent image bearing member for carrying the electrostatic latent image, said developer carrying member being effective to charge the toner to a negative polarity; a regulating member of regulating the thickness of a layer of the developer on said developer carrying member to a thickness smaller than a minimum clearance between said developer carrying member and the image bearing member; and a voltage source for applying a developing bias voltage to said developer carrying member to transfer the toner from said developer carrying member to said image bearing member; wherein said developer carrying member has an outer coating layer of resin material in which fine carbon particles and fine graphite particles are dispersed.
Claim 24
Dependent Claim
21 words
An apparatus according to claim 20, wherein the coating layer has an average volume resistivity of 10 - -10 2 ohm.cm.
Claim 25
Dependent Claim
16 words
An apparatus according to claim 21, wherein the coating layer has a thickness of 0.5-30 microns.
Claim 26
Dependent Claim
23 words
An apparatus according to any one of claim 20, wherein said voltage source applies an alternating bias voltage to said developer carrying member.
Claim 27
Dependent Claim
23 words
An apparatus according to any one of claim 20, wherein said voltage source applies a DC bias voltage to said developer carrying member.
Claim 28
Dependent Claim
17 words
An apparatus according to any one of claim 20-24, wherein the resin material is a phenol resin.
Claim 29
Independent Claim
21 words
An apparatus according to any one of claims 20-24, wherein said regulating member is in contact with said developer carrying member.
Claim 30
Dependent Claim
14 words
An apparatus according to claim 26, wherein said regulating member includes an elastic plate.
Claim 31
Independent Claim
59 words
An apparatus according to any one of claims 20-24, further comprising a stationary magnet disposed in said developer carrying member, wherein said developer carrying member carries the one component magnetic developer, and said regulating member includes a ferromagnetic member disposed within the influence of a magnetic field formed by said magnet with a clearance from said developer carrying member.
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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) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |