US5060014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus and detachable process kit utilizing a drum charging means in relatively light contact pressure therewith
Assignee: Canon Inc
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Filing: 1990-04-05
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Granted: 1991-10-22
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Expires: 2010-04-05
Abstract
Abstract An image forming apparatus or a process kit detachable relative to such an apparatus in which the contact pressure of a blade-like charging member to an image carrying member is made smaller than the contact pressure of a blade-like cleaning member to the image carrying member. This relationship reduces abrasion and damage of the image carrying member, and makes it possible uniformly and stably to charge the image carrying member.
Inventors
- 👤 Hiroyuki Adachi
- 👤 Noribumi Koitabashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:38
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/16; G03G21/18; G03G21/1803; G03G21/1814; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G2221/00; G03G2221/16; G03G2221/1606; G03G2221/1609; G03G2221/1618; G03G2221/1669; G03G2221/1693; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
92 words
A process kit detachable relative to an image forming apparatus, comprising: a movable image carrying member; cleaning means including a blade-like cleaning member for contactably cleaning said image carrying member; and charging means including a blade-like charging member for contactably charging said image carrying member at a side downstream in the direction of movement of said image carrying member from said cleaning member; wherein the contact pressure of said charging member to said image carrying member is made smaller than the contact pressure of said cleaning member to said image carrying member.
Claim 2
Dependent Claim
92 words
A process kit detachable relative to an image forming apparatus, comprising: a movable image carrying member; cleaning means including a blade-like cleaning member for contactably cleaning said image carrying member; and charging means including a blade-like charging member for contactably charging said image carrying member at a side downstream in the direction of movement of said image carrying member from said cleaning member; wherein the contact pressure of said charging member to said image carrying member is made smaller than the contact pressure of said cleaning member to said image carrying member.
Claim 3
Dependent Claim
21 words
A process kit according to claim 1, further comprising image forming means for forming an image on the image carrying member.
Claim 4
Dependent Claim
16 words
A process kit according to claim 2, wherein said image forming means comprises said charging means.
Claim 5
Dependent Claim
16 words
A process kit according to claim 1, wherein said image carrying member is a photosensitive member.
Claim 6
Dependent Claim
17 words
A process kit according to claim 4, wherein said photosensitive member is made of an organic photoconductor.
Claim 7
Dependent Claim
20 words
A process kit according to claim 5, wherein said photosensitive member is made of an organic photoconductor including polycarbonate-type resin.
Claim 8
Dependent Claim
36 words
A process kit according to claim 6, wherein the contact pressure of said charging member is less than 15 g/cm and the contact pressure of said cleaning member is 15 g/cm or more than 15 g/cm.
Claim 9
Dependent Claim
20 words
A process kit according to claim 5, wherein said photosensitive member is made of an organic photoconductor including styrene-type resin.
Claim 10
Dependent Claim
36 words
A process kit according to claim 8, wherein the contact pressure of said charging member is less than 13 g/cm and the contact pressure of said cleaning member is 14 g/cm or more than 14 g/cm.
Claim 11
Dependent Claim
25 words
A process kit according to claim 1, wherein the thickness of said blade-like charging member is smaller than the thickness of said blade-like cleaning member.
Claim 12
Dependent Claim
27 words
A process kit according to claim 1, wherein the free length of said blade-like charging member is larger than the free length of said blade-like cleaning member.
Claim 13
Dependent Claim
20 words
A process kit according to claim 1, wherein both said blade-like charging member and said blade-like cleaning member have elasticity.
Claim 14
Dependent Claim
29 words
A process kit according to claim 12, wherein the modulus of elasticity of said blade-like charging member is smaller than the modulus of elasticity of said blade-like cleaning member.
Claim 15
Dependent Claim
38 words
A process kit according to claim 11, wherein an amount of displacement of said blade-like charging member is smaller than an amount of displacement of said blade-like cleaning member in a direction normal to said image carrying member.
Claim 16
Dependent Claim
98 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; cleaning means including a blade-like cleaning member for contactably cleaning said image carrying member; and charging means including a blade-like charging member for contactably charging said image carrying member at a side downstream in the direction of movement of said image carrying member from said cleaning member; wherein the contact pressure of said charging member to said image carrying member is made smaller than the contact pressure of said cleaning member to said image carrying member.
Claim 17
Dependent Claim
98 words
An image forming apparatus comprising: a movable image carrying member; image forming means for forming an image on said image carrying member; cleaning means including a blade-like cleaning member for contactably cleaning said image carrying member; and charging means including a blade-like charging member for contactably charging said image carrying member at a side downstream in the direction of movement of said image carrying member from said cleaning member; wherein the contact pressure of said charging member to said image carrying member is made smaller than the contact pressure of said cleaning member to said image carrying member.
Claim 18
Dependent Claim
52 words
An image forming apparatus according to claim 15, wherein said image forming means comprises latent image forming means for forming a latent image on said image carrying member and developing means for developing the latent image, and said apparatus further comprises transfer means for transferring the developed image to a transfer material.
Claim 19
Dependent Claim
18 words
An image forming apparatus according to claim 16, wherein said latent image forming means comprises said charging means.
Claim 20
Dependent Claim
43 words
An image forming apparatus according to claim 17, wherein said image carrying member is a photosensitive member, and wherein said latent image forming means includes exposure means for exposing the photosensitive member charged by said blade-like charging member in accordance with the image.
Claim 21
Dependent Claim
18 words
An image forming apparatus according to claim 18, wherein said photosensitive member is made of an organic photoconductor.
Claim 22
Dependent Claim
21 words
An image forming apparatus according to claim 19, wherein said photosensitive member is made of an organic photoconductor including polycarbonate-type resin.
Claim 23
Dependent Claim
37 words
An image forming apparatus according to claim 20, wherein the contact pressure of said charging member is less than 15 g/cm and the contact pressure of said cleaning member is 15 g/cm or more than 15 g/cm.
Claim 24
Dependent Claim
21 words
An image forming apparatus according to claim 19, wherein said photosensitive member is made of an organic photoconductor including styrene-type resin.
Claim 25
Dependent Claim
37 words
An image forming apparatus according to claim 22, wherein the contact pressure of said charging member is less than 13 g/cm and the contact pressure of said cleaning member is 14 g/cm or more than 14 g/cm.
Claim 26
Dependent Claim
26 words
An image forming apparatus according to claim 15, wherein the thickness of said blade-like charging member is smaller than the thickness of said blade-like cleaning member.
Claim 27
Dependent Claim
28 words
An image forming apparatus according to claim 15, wherein the free length of said blade-like charging member is larger than the free length of said blade-like cleaning member.
Claim 28
Dependent Claim
21 words
An image forming apparatus according to claim 15, wherein both said blade-like charging member and said blade-like cleaning member have elasticity.
Claim 29
Dependent Claim
30 words
An image forming apparatus according to claim 26, wherein the modulus of elasticity of said blade-like charging member is smaller than the modulus of elasticity of said blade-like cleaning member.
Claim 30
Dependent Claim
39 words
An image forming apparatus according to claim 15, wherein an amount of displacement of said blade-like charging member is smaller than an amount of displacement of said blade-like cleaning member in a direction normal to said image carrying member.
Claim 31
Dependent Claim
24 words
An image forming apparatus according to claim 15, wherein said charging means comprises voltage application means for applying voltage to said blade-like charging 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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |