Patent US3931302A successfully refreshed from Google Patents.
Patent US5140371A successfully refreshed from Google Patents.
US5140371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact charging member, contact charging method making use of it, and apparatus making use of it
Assignee: Canon Inc
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Filing: 1990-12-21
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Granted: 1992-08-18
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Expires: 2010-12-21
Abstract
Abstract The present invention provides a contact charging member having a conductive layer free from resistance unevenness, comprising a conductive pigment and at least two kinds of polymeric elastic materials A and B, wherein the elastic material A has a higher affinity for the conductive pigment than the elastic material B.
Inventors
- 👤 Yuji Ishihara
- 👤 Tetsuya Kuribayashi
- 👤 Takashi Tanaka
- 👤 Shigemori Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
45 words
A contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the elastic material A has a higher affinity for the conductive pigment than the elastic material B.
Claim 2
Dependent Claim
45 words
A contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the elastic material A has a higher affinity for the conductive pigment than the elastic material B.
Claim 3
Dependent Claim
24 words
A contact charging member according to claim 1, wherein said conductive layer has a specific resistivity of from 1×10 3 to 1×10 12 Ω·cm.
Claim 4
Dependent Claim
19 words
A contact charging member according to claim 1, wherein said conductive layer is provided thereon with a protective layer.
Claim 5
Dependent Claim
32 words
A contact charging member according to any one of claims 1 to 3, wherein said polymeric elastic material A is a polyolefin polymer and said polymeric elastic material B is silicone rubber.
Claim 6
Dependent Claim
15 words
A contact charging member according to claim 4, wherein said conductive pigment is carbon black.
Claim 7
Dependent Claim
35 words
A contact charging member according to any one of claims 1 to 3, wherein said polymeric elastic material A and said polymeric elastic material B are blended in a weight ratio of A/B=10/90 to 90/10.
Claim 8
Dependent Claim
35 words
A contact charging member according to any one of claims 1 to 3, wherein said polymeric elastic material A and said polymeric elastic material B are blended in a weight ratio of A/B=30/70 to 70/30.
Claim 9
Dependent Claim
45 words
A contact charging member according to any one of claims 1 to 3, wherein the amount of the conductive pigment dispersed in the polymeric elastic material A is not less than twice the amount of the conductive pigment dispersed in said polymeric elastic material B.
Claim 10
Dependent Claim
77 words
A contact charging method comprising the steps of: applying a voltage to a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the elastic material A has a higher affinity for the conductive pigment than the material B; and charging a charge-receiving member during the state in which said contact charging member is in contact with the charge-receiving member.
Claim 11
Dependent Claim
77 words
A contact charging method comprising the steps of: applying a voltage to a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the elastic material A has a higher affinity for the conductive pigment than the material B; and charging a charge-receiving member during the state in which said contact charging member is in contact with the charge-receiving member.
Claim 12
Dependent Claim
30 words
A contact charging method according to claim 9, wherein said voltage applied to the contact charging member is a voltage obtained by superimposing a direct voltage on an alternating voltage.
Claim 13
Independent Claim
93 words
A device unit comprising: a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the material A has a higher affinity for the conductive pigment than the material B; and a charge-receiving member which is in contact with and charged by said contact charging member; said contact charging member and said charge-receiving member are contained within one unit so that the unit can be freely attached to or detached from the body of an apparatus.
Claim 14
Independent Claim
93 words
A device unit comprising: a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the material A has a higher affinity for the conductive pigment than the material B; and a charge-receiving member which is in contact with and charged by said contact charging member; said contact charging member and said charge-receiving member are contained within one unit so that the unit can be freely attached to or detached from the body of an apparatus.
Claim 15
Dependent Claim
84 words
An electrophotographic apparatus, comprising a photosensitive member, a means for forming latent images, a means for developing the latent image formed, and a means for transferring the developed image, wherein: a charging member of said means for forming latent images is a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic material A and B, wherein the material A has a higher affinity for the conductive pigment than the material B.
Claim 16
Dependent Claim
84 words
An electrophotographic apparatus, comprising a photosensitive member, a means for forming latent images, a means for developing the latent image formed, and a means for transferring the developed image, wherein: a charging member of said means for forming latent images is a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic material A and B, wherein the material A has a higher affinity for the conductive pigment than the material B.
Claim 17
Dependent Claim
105 words
A facsimile machine, comprising an electrophotographic apparatus and a receiving means for receiving image information from a remote terminal, said electrophotographic apparatus comprising a photosensitive member, a means for forming a latent image, a means for developing the latent image formed, and a means for transferring the developed image, wherein: a charging member of said means for forming a latent image is a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the material A has a higher affinity for the conductive pigment than the material B.
Claim 18
Dependent Claim
105 words
A facsimile machine, comprising an electrophotographic apparatus and a receiving means for receiving image information from a remote terminal, said electrophotographic apparatus comprising a photosensitive member, a means for forming a latent image, a means for developing the latent image formed, and a means for transferring the developed image, wherein: a charging member of said means for forming a latent image is a contact charging member having a conductive layer comprising a conductive pigment and a blend of at least two kinds of polymeric elastic materials A and B, wherein the material A has a higher affinity for the conductive pigment than the material B.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |