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US5081496A Expired / Lapsed US ⏱️ 0.0 years remaining

Image forming apparatus having a ventilated contact charging unit

Assignee: Canon Inc
•
Filing: 1990-03-23
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Granted: 1992-01-14
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Expires: 2010-03-23
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Abstract

Abstract An image forming apparatus includes a charging unit for charging an image carrying member contacting the image carrying member as the charging unit for charging the image carrying member. By generating an airflow along the longer direction of a contact portion between the charging unit and the image carrying member, discharge products generated in the neighborhood of the contact portion are removed. It is thereby possible to prevent image degradation and the like caused by accumulation of the discharge products.

Inventors

  • 👤 Hiroyuki Takeda

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 13:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0258; G03G15/0208; G03G15/0216

Claims Analysis

Total Claims: 21
Claim 1
Independent Claim 62 words
An image forming apparatus comprising: a movable image carrying member; charging means for charging said movable image carrying member by contacting said movable image carrying member; and means for generating an airflow along a direction substantially perpendicular to the moving direction of said movable image carrying member at a contact portion established between said movable image carrying member and said charging means.
Claim 2
Dependent Claim 62 words
An image forming apparatus comprising: a movable image carrying member; charging means for charging said movable image carrying member by contacting said movable image carrying member; and means for generating an airflow along a direction substantially perpendicular to the moving direction of said movable image carrying member at a contact portion established between said movable image carrying member and said charging means.
Claim 3
Dependent Claim 35 words
An image forming apparatus according to claim 1, wherein said charging means includes a rotating member in rotating contact with said movable image carrying member, wherein a predetermined voltage is applied to said rotating member.
Claim 4
Dependent Claim 45 words
An image forming apparatus according to claim 1, wherein said means for generating an airflow includes a fan, which is disposed at an end portion relative to a direction substantially perpendicular to the moving direction of said movable image carrying member of said charging means.
Claim 5
Dependent Claim 19 words
An image forming apparatus according to claim 1, wherein said movable image carrying member is a movable photosensitive member.
Claim 6
Dependent Claim 146 words
An image forming apparatus comprising: a process cartridge to be detachably mounted on said image forming apparatus comprising a movable image carrying member, a process means for acting on said movable image carrying member, and a housing for supporting said movable image carrying member and said process means, said housing of said process cartridge including ventilation openings, wherein said process means in said process cartridge includes at least one charging means for charging said movable image carrying member and is in contact with said movable image carrying member; and means for generating an airflow along a direction substantially perpendicular to the moving direction of said movable image carrying member at a contact portion established between said movable image carrying member and said charging means within the process cartridge, wherein said means for generating an airflow causes air to be drawn in and discharged through said openings.
Claim 7
Dependent Claim 146 words
An image forming apparatus comprising: a process cartridge to be detachably mounted on said image forming apparatus comprising a movable image carrying member, a process means for acting on said movable image carrying member, and a housing for supporting said movable image carrying member and said process means, said housing of said process cartridge including ventilation openings, wherein said process means in said process cartridge includes at least one charging means for charging said movable image carrying member and is in contact with said movable image carrying member; and means for generating an airflow along a direction substantially perpendicular to the moving direction of said movable image carrying member at a contact portion established between said movable image carrying member and said charging means within the process cartridge, wherein said means for generating an airflow causes air to be drawn in and discharged through said openings.
Claim 8
Dependent Claim 19 words
An image forming apparatus according to claim 5, wherein said movable image carrying member is a movable photosensitive member.
Claim 9
Dependent Claim 42 words
An image forming apparatus according to claim 5, wherein said ventilation openings are provided at two end portions of said charging means relative to a direction substantially perpendicular to the moving direction of said movable image carrying member of said charging means.
Claim 10
Dependent Claim 44 words
An image forming apparatus according to claim 7, wherein said means for generating an airflow includes a fan, which is disposed at a main body of said image forming apparatus facing at least a ventilation opening at one end portion of said charging means.
Claim 11
Dependent Claim 34 words
An image forming apparatus according to claim 5, wherein said charging means includes a rotating member in rotating contact with said movable image carrying member, and predetermined voltage is applied to said rotating member.
Claim 12
Dependent Claim 39 words
An image forming apparatus according to claim 5, wherein said process cartridge includes a tunnel member surrounding said charging means along a direction substantially perpendicular to the moving direction of said movable image carrying member of the charging means.
Claim 13
Dependent Claim 40 words
An image forming apparatus according to claim 5, wherein said means for generating an airflow includes a ventilation passage communicating with said ventilation openings in said housing of said process cartridge within a main body of the image forming apparatus.
Claim 14
Dependent Claim 101 words
A process cartridge to be detachably mounted on an image forming apparatus comprising: a movable image carrying member; a process means for acting on said movable image carrying member, said process means including at least one charging means for charging said image carrying member contacting the movable image carrying member; and a housing for supporting said movable image carrying member and said process means, said housing including an air passage portion along a direction substantially perpendicular to the moving direction of said movable image carrying member at a contact portion established between said movable image carrying member and said charging means.
Claim 15
Dependent Claim 101 words
A process cartridge to be detachably mounted on an image forming apparatus comprising: a movable image carrying member; a process means for acting on said movable image carrying member, said process means including at least one charging means for charging said image carrying member contacting the movable image carrying member; and a housing for supporting said movable image carrying member and said process means, said housing including an air passage portion along a direction substantially perpendicular to the moving direction of said movable image carrying member at a contact portion established between said movable image carrying member and said charging means.
Claim 16
Dependent Claim 39 words
A process cartridge according to claim 12, wherein said housing includes openings at end portions of said charging means relative to a direction substantially perpendicular to the moving direction of said movable image carrying member of the charging means.
Claim 17
Dependent Claim 32 words
A process cartridge according to claim 12, wherein said charging means includes a rotating member in rotating contact with said image carrying member, and predetermined voltage is applied to said rotating member.
Claim 18
Dependent Claim 18 words
A process cartridge according to claim 12, wherein said movable image carrying member is a movable photosensitive member.
Claim 19
Dependent Claim 65 words
An image forming apparatus according to claim 1, wherein said means for generating an airflow generates an airflow along a direction substantially perpendicular to the moving direction of said movable image carrying member from one end to the other end of said movable image carrying member in the area adjacent to a contact portion established between said movable image carrying member and said charging means.
Claim 20
Dependent Claim 60 words
A process cartridge according to claim 12, wherein said air passage portion is along a direction substantially perpendicular to the moving direction of said movable image carrying member from one end to the other end of said movable image carrying member in the area adjacent to a contact portion established between said movable image carrying member and said charging means.
Claim 21
Dependent Claim 65 words
An image forming apparatus according to claim 5, wherein said means for generating an airflow generates an airflow along a direction substantially perpendicular to the moving direction of said movable image carrying member from one end to the other end of said movable image carrying member in the area adjacent to a contact portion established between said movable image carrying member and said charging means.

References Cited (Backward Citations)

US4540268A Cited
JPS60104972A Cited
US4851960A Cited
US4727453A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-01-13 1995-07-15 1996-01-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-01-13 1999-07-15 2000-01-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-01-13 2003-07-15 2004-01-14 $7700.00 Window Closed / Lapsed

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