US5384626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging member, process cartridge and image forming apparatus
Assignee: Canon Inc
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Filing: 1993-09-07
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Granted: 1995-01-24
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Expires: 2013-09-07
Abstract
Abstract A charging member for charging a member to be charged while being in contact therewith includes conductive base for being supplied with a voltage; a surface layer contactable to the member to be charged; a sponge layer between the conductive base and the surface layer; a 100% modulus M 100 (kg/cm 2 ) of the surface layer and a thickness d (cm) of the surface layer satisfied: M.sub.100 ×d≦1.5 (kg/cm).
Inventors
- 👤 Harumi Kugoh
- 👤 Junji Araya
- 👤 Hideyuki Yano
- 👤 Tadashi Furuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233; G03G2221/00; G03G2221/16; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A charging member for charging a member to be charged while being in contact therewith, comprising: a conductive base for being supplied with a voltage; a surface layer contactable to the member to be charged; a sponge layer between said conductive base and said surface layer; a 100% modulus M 100 (kg/cm 2 ) of said surface layer and a thickness d (cm) of the surface layer satisfied: M.sub.100 ×d≦1.5(kg/cm).
Claim 2
Dependent Claim
70 words
A charging member for charging a member to be charged while being in contact therewith, comprising: a conductive base for being supplied with a voltage; a surface layer contactable to the member to be charged; a sponge layer between said conductive base and said surface layer; a 100% modulus M 100 (kg/cm 2 ) of said surface layer and a thickness d (cm) of the surface layer satisfied: M.sub.100 ×d≦1.5(kg/cm).
Claim 3
Dependent Claim
90 words
A process cartridge detachably mountable to an image forming apparatus, comprising: an image bearing member; a charging member contactable to said image bearing member to electrically charge said image bearing member, said charging member including a conductive base for being supplied with a voltage, a surface layer contactable to said image bearing member and a sponge layer between said conductive base and said surface layer; wherein a 100% modulus M 100 (kg/cm 2 ) of said surface layer and a thickness d (cm) of the surface layer satisfy: M.sub.100 ×d≦1.5(kg/cm).
Claim 4
Dependent Claim
90 words
A process cartridge detachably mountable to an image forming apparatus, comprising: an image bearing member; a charging member contactable to said image bearing member to electrically charge said image bearing member, said charging member including a conductive base for being supplied with a voltage, a surface layer contactable to said image bearing member and a sponge layer between said conductive base and said surface layer; wherein a 100% modulus M 100 (kg/cm 2 ) of said surface layer and a thickness d (cm) of the surface layer satisfy: M.sub.100 ×d≦1.5(kg/cm).
Claim 5
Dependent Claim
22 words
A process cartridge according to claim 2, wherein said process cartridge contains developing means for developing said image bearing member with toner.
Claim 6
Dependent Claim
84 words
An image forming apparatus comprising: an image bearing member; a charging member contactable to said image bearing member to electrically charge said image bearing member, said charging member including a conductive base for being supplied with a voltage, a surface layer contactable to said image bearing member and a sponge layer between said conductive base and said surface layer; wherein a 100% modulus M 100 (kg/cm 2 ) of said surface layer and a thickness d (cm) of the surface layer satisfy: M.sub.100 ×d≦1.5(kg/cm).
Claim 7
Dependent Claim
84 words
An image forming apparatus comprising: an image bearing member; a charging member contactable to said image bearing member to electrically charge said image bearing member, said charging member including a conductive base for being supplied with a voltage, a surface layer contactable to said image bearing member and a sponge layer between said conductive base and said surface layer; wherein a 100% modulus M 100 (kg/cm 2 ) of said surface layer and a thickness d (cm) of the surface layer satisfy: M.sub.100 ×d≦1.5(kg/cm).
Claim 8
Dependent Claim
13 words
An apparatus according to claim 4, wherein said voltage is an oscillating voltage.
Claim 9
Dependent Claim
19 words
An apparatus according to claim 5, wherein said oscillating voltage is an AC voltage biased with a DC voltage.
Claim 10
Dependent Claim
21 words
An apparatus according to claim 4, wherein said surface layer has a volume resistivity larger than that of said sponge layer.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 4, wherein said surface layer comprises as a major component non-rubber resin material.
Claim 12
Dependent Claim
19 words
An apparatus according to claim 4, wherein the thickness of said surface layer is not less than 50 microns.
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