US4707382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer carrier and a method for manufacturing the same
Assignee: Ricoh Co Ltd
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Filing: 1984-09-25
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Granted: 1987-11-17
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Expires: 2004-09-25
Abstract
Abstract A developer carrier to be formed is provided with an electrode layer which includes a plurality of electrode particles embedded in a dielectric material as electrically isolated from one another and exposed at an outer surface at least partly. In one aspect of the present invention, an underlying layer is first formed on a support and then an electrode layer is formed on the underlying layer. In forming the electrode layer, a first layer of first dielectric, adhesive layer is formed on the underlying layer and, after application of a plurality of electrode particles on the first layer, a second layer of second dielectric, adhesive layer is formed on the first layer and the electrode particles to define a to-be-formed electrode layer, whose outer surface is processed to have said electrode particles exposed at the processed outer surface thereby defining the electrode layer. In another aspect, there is provided a developer carrier having the underlying layer which includes an elastomer and a magnetic material. Also provided is a developer carrier which further includes an intermediate dielectric layer as sandwiched between the underlying and electrode layers. Various methods for manufacturing such elastomer-containing developer carriers are also provided.
Inventors
- 👤 Shoji Tajima
- 👤 Yasuo Kadomatsu
- 👤 Yoshio Miyazaki
- 👤 Michikazu Sakurai
- 👤 Kimio Anze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; B; B05; B05B; B05B13/00; B05B13/02; B05B13/04; B05B5/00; B05B5/08; Y; Y10; Y10S; Y10S118/00; Y10S118/05; Y10S118/07
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
158 words
A method for manufacturing a developer carrier for use in a developing device, comprising the steps of: preparing an electrically conductive support; forming an underlying layer of composite material including an elastic material and a magnetic material; magnetizing said underlying layer to produce alternating N and S polarities at a predetermined pitch; forming a first layer of first dielectric, adhesive agent on said underlying layer; applying a plurality of electrode particles on said first layer; forming a second layer of second dielectric, adhesive agent on said first layer and said plurality of electrode particles thereby forming a to-be-formed electrode layer by said first and second layers and plurality of said electrode particles; and processing an outer surface of said to-be-formed electrode layer to form an electrode layer having a predetermined thickness with said plurality of electrode particles being embedded in said electrode layer as electrically isolated from one another and being partly exposed at said processed outer surface.
Claim 2
Independent Claim
158 words
A method for manufacturing a developer carrier for use in a developing device, comprising the steps of: preparing an electrically conductive support; forming an underlying layer of composite material including an elastic material and a magnetic material; magnetizing said underlying layer to produce alternating N and S polarities at a predetermined pitch; forming a first layer of first dielectric, adhesive agent on said underlying layer; applying a plurality of electrode particles on said first layer; forming a second layer of second dielectric, adhesive agent on said first layer and said plurality of electrode particles thereby forming a to-be-formed electrode layer by said first and second layers and plurality of said electrode particles; and processing an outer surface of said to-be-formed electrode layer to form an electrode layer having a predetermined thickness with said plurality of electrode particles being embedded in said electrode layer as electrically isolated from one another and being partly exposed at said processed outer surface.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein said elastic material is an elastomer.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein said elastomer is a halogen-family polymer having no double carbon bond in its main chain.
Claim 5
Dependent Claim
11 words
The method of claim 3 wherein said polymer is chlorinated polyethylene.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein each of said electrode particles is comprised of a particle of electrically conductive material coated with an electrically insulating material.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein said support is in the form of a roll integrally provided with a pair of end shafts each at each end face.
Claim 8
Dependent Claim
49 words
The method of claim 1 wherein said first layer is formed to such a thickness that each of said electrode particles come into contact with said underlying layer as becoming embedded in said first layer at least partly when deposited onto said first layer during said step of applying.
Claim 9
Independent Claim
170 words
A method for manufacturing a developer carrier for use in a developing device, comprising the steps of: preparing an electrically conductive material; forming an underlying layer of composite material including an elastic material and a magnetic material; magnetizing said underlying layer to produce alternating N and S polarities at a predetermined pitch; forming an overlying layer of dielectric material on said underlying layer; forming a first layer of first dielectric adhesive agent on said overlying layer; applying a plurality of electrode particles on said first layer; forming a second layer of second dielectric adhesive material on said first layer and said plurality of electrode particles thereby defining a to-be-formed electrode layer by said first and second layers and plurality of electrode particles; and processing an outer surface of said to-be-formed electrode layer to form an electrode layer having a predetermined thickness with said plurality of electrode particles being embedded in said electrode layer as electrically isolated from one another and being exposed at said processed outer surface at least partly.
Claim 10
Independent Claim
170 words
A method for manufacturing a developer carrier for use in a developing device, comprising the steps of: preparing an electrically conductive material; forming an underlying layer of composite material including an elastic material and a magnetic material; magnetizing said underlying layer to produce alternating N and S polarities at a predetermined pitch; forming an overlying layer of dielectric material on said underlying layer; forming a first layer of first dielectric adhesive agent on said overlying layer; applying a plurality of electrode particles on said first layer; forming a second layer of second dielectric adhesive material on said first layer and said plurality of electrode particles thereby defining a to-be-formed electrode layer by said first and second layers and plurality of electrode particles; and processing an outer surface of said to-be-formed electrode layer to form an electrode layer having a predetermined thickness with said plurality of electrode particles being embedded in said electrode layer as electrically isolated from one another and being exposed at said processed outer surface at least partly.
Claim 11
Dependent Claim
12 words
The method of claim 8, wherein said elastic material is an elastomer.
Claim 12
Dependent Claim
20 words
The method of claim 9 wherein said elastomer is a halogen-family polymer having no double bond in its main chain.
Claim 13
Dependent Claim
11 words
The method of claim 10 wherein said polymer is chlorinated polyethylene.
Claim 14
Dependent Claim
16 words
The method of claim 8 wherein said magnetic material is ferrite powder mixed in said elastomer.
Claim 15
Dependent Claim
24 words
The method of claim 8 wherein said support is a roll integrally provided with a pair of end shafts each at each end face.
Claim 16
Dependent Claim
11 words
The method of claim 8 wherein said dielectric material is elastic.
Claim 17
Dependent Claim
12 words
The method of claim 14 wherein said elastic dielectric material is rubber.
References Cited (Backward Citations)
US4587699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |