Patent EP0312230A2 successfully refreshed from Google Patents.
EP0312230A2
Expired / Lapsed
EP
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An image forming apparatus
Assignee: Canon Inc
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Filing: 1988-10-03
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Granted: —
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Expires: 2008-10-03
Abstract
Abstract An image forming apparatus includes a cleaning blade (6A) cleaning a photosensitive member (1) and a contact charging blade (2) for charging the photosensitive member. The contact charging blade is contacted to the photosensitive member with a frictional coefficient which is smaller than the frictional coefficient at which the cleaning blade is contacted to the photosensitive member. The photosensitive member and the blades are protected from wearing and damage even if the contact charging blade is contacted to such a portion of the photosensitive member which is free from residual matter due to the function of the cleaning blade. In addition, the service life of the contact charging blade can be expanded to be substantially equal to that of the cleaning blade, and therefore, the present invention is particularly effective when both of the blades are provided in a process cartridge detachably mountable into a main assembly of the apparatus.
Inventors
- 👤 Hiroyuki Adachi
- 👤 Noribumi Canon-Ryo Koitabashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:09
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/16; G03G21/18; G03G21/1803; G03G21/1814; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G21/0005; G03G21/0011; G03G2221/00; G03G2221/16; G03G2221/1618; G03G2221/1651; G03G2221/1654; G03G2221/1669; G03G2221/1693; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
An image forming device, comprising: a movable image bearing member; a cleaning member in the form of a blade contactable to said image bearing member with a first frictional coefficient to clean said image bearing member; a charging member in the form of a blade for charging said image bearing member, said charging member being contacted to said image bearing member at a position downstream of said cleaning member with respect to movement direction of said image bearing member with a second frictional coefficient which is smaller than the first frictional coefficient; and voltage application means for applying a voltage to said charging member.
Claim 2
Dependent Claim
104 words
An image forming device, comprising: a movable image bearing member; a cleaning member in the form of a blade contactable to said image bearing member with a first frictional coefficient to clean said image bearing member; a charging member in the form of a blade for charging said image bearing member, said charging member being contacted to said image bearing member at a position downstream of said cleaning member with respect to movement direction of said image bearing member with a second frictional coefficient which is smaller than the first frictional coefficient; and voltage application means for applying a voltage to said charging member.
Claim 3
Dependent Claim
50 words
A device according to Claim 1, wherein said charging member is contacted to said image bearing member at a first contact angle, and said cleaning member is contacted to said image bearing member at a second contact angle wherein the first contact angle is smaller than the second contact angle.
Claim 4
Dependent Claim
26 words
A device according to Claim 2, wherein the contact angle of said charging member relative to said image bearing member is not more than 20 degrees.
Claim 5
Independent Claim
50 words
A device according to any preceding claim, wherein said charging member is contacted to said image bearing member at a contact angle which is formed downsteam of a position where said image bearing member and said charging member are contacted, with respect to movement direction of said image bearing member.
Claim 6
Dependent Claim
49 words
A device according to Claim 4, wherein said cleaning member is contacted to said image bearing member at a contact angle which is formed downstream of a position where said image bearing member and said cleaning member are contacted, with respect to movement direction of said image bearing member.
Claim 7
Independent Claim
20 words
A device according to any preceding claim, wherein said voltage application means applies a vibratory voltage to said charging member.
Claim 8
Dependent Claim
21 words
A device according to Claim 6, wherein said vibratory voltage is provided by superposing a DC voltage and an AC voltage.
Claim 9
Dependent Claim
35 words
A device according to Claim 6 or 7, wherein the vibratory voltage has a peak-to-peak voltage which is not less than twice an absolute value of a charge starting voltage to said image bearing member.
Claim 10
Independent Claim
14 words
A device according to any preceding claim, wherein said charging member is of rubber.
Claim 11
Dependent Claim
22 words
A device according to Claim 1, wherein said charging member includes a low frictional coefficient layer contactable to said image bearing member.
Claim 12
Independent Claim
32 words
A device according to any preceding claim, further comprising supporting means for integrally supporting said charging member and said cleaning member, said supporting means being detachably mountable to said image forming apparatus.
Claim 13
Independent Claim
25 words
A device as claimed in any preceding claim, in the form of a process cartridge detachably mountable to a main assembly of image forming apparatus.
Claim 14
Dependent Claim
15 words
An image forming apparatus having an image forming device as claimed in any preceding claim.
References Cited (Backward Citations)
No citation records indexed.
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