Patent US1199975A successfully refreshed from Google Patents.
EP0096261A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A process kit and an image forming apparatus using the same
Assignee: Canon Inc
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Filing: 1983-05-19
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Granted: —
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Expires: 2003-05-19
Abstract
Abstract A process kit (30) is detachably mounted in the main body (17,18) of an image forming apparatus and includes a housing (20, 30a) in which a photosensitive member (3), a corona discharger (4) and a developing device (5) are mounted and held as a unit, the housing (20, 30a) including an optical opening (35) formed therein upstream of the corona discharger (4) for conducting a homogeneous light to the photosensitive member (3) to eliminate any remaining charge thereon and an opening (27) of exposure for conducting a light of information to the photosensitive member (3), the exposure opening (27) being located between the corona discharger (4) and the developing device (5).
Inventors
- 👤 Shigeyoshi Onoda
- 👤 Akihiro Nomura
- 👤 Morikazu Mizutani
- 👤 Shinji Kanemitsu
- 👤 Mototada Toriumi
- 👤 Fumio Nishino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 22:46
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/16; G03G21/18; G03G21/1803; G03G21/1814; G03G15/00; G03G21/1604; G03G21/1623; G03G21/1628; G03G21/1661; G03G21/1671; G03G21/1828; G03G21/1832; G03G2221/00; G03G2221/16; G03G2221/1606; G03G2221/1609; G03G2221/1612; G03G2221/1636; G03G2221/1648; G03G2221/1651; G03G2221/1654; G03G2221/1678; G03G2221/1687; G03G2221/1693; G03G2221/18; G03G2221/183; G03G2221/1853; G03G2221/1876
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
A process kit for use in an image forming apparatus, characterized in that said process kit (30) comprises a photosensitive drum (3), corona discharge means (4) for uniformly charging said photosensitive drum (3) to a predetermined potential, development means (5) for developing an electrostatic latent image formed on said photosensitive drum (3) and housing means (20, 30a) containing said photosensitive drum (3), said corona discharge means (4) and said development means (5) with said corona discharge means (4) and development means (5) being respectively disposed upstream and downstream about a position in which said photosensitive drum (3) is exposed to a light of information, said housing means (20, 30a) including an optical opening (35) located upstream of said corona discharge means (4) for conducting a homogeneous light to said photosensitive drum (3) to discharge the remaining charge on said photosensitive drum (3) and an opening (27) of exposure located between said corona discharge means (4) and said development means (5) for conducting said information light to said photosensitive drum (3).
Claim 2
Dependent Claim
170 words
A process kit for use in an image forming apparatus, characterized in that said process kit (30) comprises a photosensitive drum (3), corona discharge means (4) for uniformly charging said photosensitive drum (3) to a predetermined potential, development means (5) for developing an electrostatic latent image formed on said photosensitive drum (3) and housing means (20, 30a) containing said photosensitive drum (3), said corona discharge means (4) and said development means (5) with said corona discharge means (4) and development means (5) being respectively disposed upstream and downstream about a position in which said photosensitive drum (3) is exposed to a light of information, said housing means (20, 30a) including an optical opening (35) located upstream of said corona discharge means (4) for conducting a homogeneous light to said photosensitive drum (3) to discharge the remaining charge on said photosensitive drum (3) and an opening (27) of exposure located between said corona discharge means (4) and said development means (5) for conducting said information light to said photosensitive drum (3).
Claim 3
Dependent Claim
54 words
A process kit as defined in claim 1, characterized in that said exposure opening (27) for exposing said photosensitive drum to said information light is closed by a cover (28) and adapted to be opened by removing said cover (28) when said process kit (30) is to be mounted in said image forming apparatus.
Claim 4
Dependent Claim
47 words
A process kit as defined in claim 1 or 2, characterized in that said exposure opening (27) for exposing said photosensitive drum (3) to said information light is located in a recessed portion which is formed in said housing means (20, 30a) of said process kit (30).
Claim 5
Dependent Claim
54 words
A process kit as defined in claim 1, 2 or 3, characterized in that said cover (28) for closing and opening said exposure opening (27) is in the form of a plate-like member (28) which is rotated about one side edge of said exposure opening (27) to close and open said exposure opening (27).
Claim 6
Dependent Claim
115 words
A process kit as defined in claim 1, 2 or 3, characterized in that said cover (28) for closing and opening said exposure opening (27) is in the form of a plate-like member (28) which is rotated about one side edge of said exposure opening (27) to close and open said exposure opening (27), said plate-like member (28) including a recessed portion (28a) formed therein downstream in the direction in which said plate-like member (28) is mounted to close said exposure opening (27), said recessed portion (28a) of said member (28) being adapted to engage with a component (2) in said image forming apparatus when said exposure opening (27) is closed by said cover (28).
Claim 7
Dependent Claim
31 words
A process kit as defined in claim 1, 2 or 3, characterized in that said optical opening (35) located upstream of said corona discharge means (4) includes a light diffusion member.
Claim 8
Dependent Claim
29 words
A process kit as defined in claim 1, 2 or 3, characterized in that said housing means (20, 30a) and said cover (28) are made of a light-shielding material.
Claim 9
Dependent Claim
84 words
A process kit as defined in claim 1, 2 or 3, characterized in that said corona discharge means (4) includes a corona discharging wire (49) and a member (50, 52, 54) located between said photosensitive drum (3) and said corona discharging wire (49) for positioning said wire (49) at the desired level from the surface of said photosensitive drum (3), said member (50, 52, 54) being urged toward the surface of said photosensitive drum (3) under the tension in said corona discharging wire (49).
Claim 10
Dependent Claim
56 words
A process kit as defined in any one of claims 1 to 8, characterized in that said image forming apparatus includes a source of light (15) from which a light is conducted to said photosensitive drum (3) through the opening (35) in said process kit (30) to eliminate the remaining charge on said photosensitive drum (3).
References Cited (Backward Citations)
No citation records indexed.
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