EP0596477A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Charging member and apparatus using the same
Assignee: Canon Inc
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Filing: 1993-11-03
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Granted: —
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Expires: 2013-11-03
Abstract
Abstract A charging member for use in a contact charging device for charging a charge-receiving member through steps of: applying a voltage to the charging member and disposing the charging member being in contact with the charge-receiving member, comprising: at least an elastic layer and a surface layer disposed thereon contacting the charge-receiving member; wherein the surface layer comprises at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin. The charging member is usable for constituting a device unit and an electrophotographic apparatus, and is effective for providing an improved withstand voltage and stable image quality.
Inventors
- 👤 Yasuyuki c/o Canon Chemical K.K. Suzuki
- 👤 Takashi c/o Canon Chemical K.K. Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
73 words
A charging member for use in a contact charging device for charging a charge-receiving member through steps of: applying a voltage to the charging member and disposing the charging member being in contact with the charge-receiving member, comprising: at least an elastic layer and a surface layer disposed thereon contacting the charge-receiving member; wherein the surface layer comprises at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin.
Claim 2
Dependent Claim
73 words
A charging member for use in a contact charging device for charging a charge-receiving member through steps of: applying a voltage to the charging member and disposing the charging member being in contact with the charge-receiving member, comprising: at least an elastic layer and a surface layer disposed thereon contacting the charge-receiving member; wherein the surface layer comprises at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin.
Claim 3
Dependent Claim
21 words
A member according to Claim 1, wherein the insulating metal oxide has a volume resistivity of at least 1×10 12 ohm.cm.
Claim 4
Dependent Claim
23 words
A member according to Claim 1 or 2, wherein the semiconductive resin has a volume resistivity of 1×10 7 ohm.cm to lx1011 ohm.cm.
Claim 5
Dependent Claim
24 words
A member according to Claim 1 or 2, wherein the semiconductive resin has a volume resistivity of 1x10 8 ohm.cm to 1x10 10 ohm.cm.
Claim 6
Dependent Claim
24 words
A member according to Claim 1, wherein the surface layer has a maximum height of surface roughness (Rmax) of 10 µm to 100 µm.
Claim 7
Dependent Claim
21 words
A member according to Claim 1, wherein the elastic layer has a resistance of 1×10 2 ohm to 1×10 5 ohm.
Claim 8
Dependent Claim
14 words
A member according to Claim 2, wherein the insulating metal oxide is magnesium oxide.
Claim 9
Dependent Claim
12 words
A member according to Claim 1, wherein the semiconductive resin is polyamide.
Claim 10
Independent Claim
97 words
A device unit, comprising: a charging member, an electrophotographic photosensitive member, and either one or both of developing means and cleaning means integrally supported together with the charging member and the photosensitive member to form a single unit capable of being attached to or detached from an apparatus body as desired; the charging member comprising: an electroconductive support, and at least an elastic layer and a surface layer contacting a charge-receiving member disposed on the electroconductive support; and the surface layer comprising at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin.
Claim 11
Independent Claim
97 words
A device unit, comprising: a charging member, an electrophotographic photosensitive member, and either one or both of developing means and cleaning means integrally supported together with the charging member and the photosensitive member to form a single unit capable of being attached to or detached from an apparatus body as desired; the charging member comprising: an electroconductive support, and at least an elastic layer and a surface layer contacting a charge-receiving member disposed on the electroconductive support; and the surface layer comprising at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin.
Claim 12
Dependent Claim
21 words
A unit according to Claim 9, wherein the insulating metal oxide has a volume resistivity of at least 1×10 12 ohm.cm.
Claim 13
Dependent Claim
23 words
A unit according to Claim 9 or 10, wherein the semiconductive resin has a volume resistivity of 1×10 7 ohm.cm to 1x1011 ohm.cm.
Claim 14
Dependent Claim
88 words
An electrophotographic apparatus, comprising: a photosensitive member, a charging member for charging the photosensitive member, means for developing a latent image formed on the photosensitive member to form a developed image, and means for transferring the developed image to a transfer-receiving material; the charging member comprising: an electroconductive support, and at least an elastic layer and a surface layer contacting a charge-receiving member disposed on the electroconductive support; and the surface layer comprising at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin.
Claim 15
Dependent Claim
88 words
An electrophotographic apparatus, comprising: a photosensitive member, a charging member for charging the photosensitive member, means for developing a latent image formed on the photosensitive member to form a developed image, and means for transferring the developed image to a transfer-receiving material; the charging member comprising: an electroconductive support, and at least an elastic layer and a surface layer contacting a charge-receiving member disposed on the electroconductive support; and the surface layer comprising at least a semiconductive resin and an insulating metal oxide contained in the semiconductive resin.
Claim 16
Dependent Claim
21 words
An apparatus according to Claim 12, wherein the insulating metal oxide has a volume resistivity of at least 1×10 12 ohm.cm.
Claim 17
Dependent Claim
23 words
An apparatus according to Claim 12 or 13, wherein the semiconductive resin has a volume resistivity of 1×10 7 ohm.cm to lx1011 ohm.cm.
References Cited (Backward Citations)
No citation records indexed.
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