US4263391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid development process with porous elastic development cleaning roller
Assignee: Canon Inc
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Filing: 1979-08-21
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Granted: 1981-04-21
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Expires: 1999-08-21
Abstract
Abstract An electrophotographic process involving the repeated cycles of a developing step for developing an electrostatic latent image formed on a latent image carrying member with a liquid developer, a transfer step for transferring the thus obtained visible image from said latent image carrying member onto another member, and a cleaning step for subsequently cleaning the surface of said latent image carrying member, comprising the use of an elastic rotary member composed of an electroconductive rigid core member, an electroconductive porous elastic member capable of retaining a liquid therein and provided around said core member, and a liquid-permeable insulating flexible member of a thickness in the range of 20 to 400 microns provided to surround the outer periphery of said elastic member, said elastic rotary member being maintained in pressure contact with said latent image carrying member, whereby said developing step is achieved by the liquid developer squeezed out from said elastic rotary member and the excessive liquid developer present on said latent image carrying member is recovered therefrom by absorption upon recovery of said elastic rotary member from the compressed state thereof.
Inventors
- 👤 Takashi Saito
- 👤 Tsuyoshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101; G03G13/00; G03G13/06; G03G13/10; G03G13/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
196 words
An electrophotographic process involving the repeated cycles of a developing step for developing an electrostatic latent image formed on a latent image carrying member with a liquid developer, a transfer step for transferring the thus obtained visible image from said latent image carrying member onto another member, and a cleaning step for subsequently cleaning the surface of said latent image carrying member, comprising the use of an elastic rotary member composed of an electroconductive rigid core member, an electroconductive porous elastic member of a volume resistivity in the range of 10 2 to 10 8 Ω·cm capable of retaining a liquid therein and provided around said core member, and a liquid-permeable insulating flexible member of a thickness in the range of 20 to 400 microns provided to surround the outer periphery of said elastic member, said elastic rotary member being maintained in pressure contact with said latent image carrying member, whereby said developing step is achieved by the liquid developer squeezed out from said elastic rotary member and the excessive liquid developer present on said latent image carrying member is recovered therefrom by absorption upon recovery of said elastic rotary member from the compressed state thereof.
Claim 2
Dependent Claim
196 words
An electrophotographic process involving the repeated cycles of a developing step for developing an electrostatic latent image formed on a latent image carrying member with a liquid developer, a transfer step for transferring the thus obtained visible image from said latent image carrying member onto another member, and a cleaning step for subsequently cleaning the surface of said latent image carrying member, comprising the use of an elastic rotary member composed of an electroconductive rigid core member, an electroconductive porous elastic member of a volume resistivity in the range of 10 2 to 10 8 Ω·cm capable of retaining a liquid therein and provided around said core member, and a liquid-permeable insulating flexible member of a thickness in the range of 20 to 400 microns provided to surround the outer periphery of said elastic member, said elastic rotary member being maintained in pressure contact with said latent image carrying member, whereby said developing step is achieved by the liquid developer squeezed out from said elastic rotary member and the excessive liquid developer present on said latent image carrying member is recovered therefrom by absorption upon recovery of said elastic rotary member from the compressed state thereof.
Claim 3
Dependent Claim
29 words
An electrophotographic process according to the claim 1, wherein said porous elastic member is provided with a volume resistivity in the range of 10 2 to 10 6 Ω·cm.
Claim 4
Dependent Claim
29 words
An electrophotographic process according to the claim 1, wherein said porous elastic member is provided with a volume resistivity in the range of 10 5 to 10 7 Ω·cm.
Claim 5
Dependent Claim
25 words
An electrophotographic process according to the claim 1, wherein said flexible member is provided with a thickness in the range of 50 to 300 microns.
Claim 6
Dependent Claim
25 words
An electrophotographic process according to the claim 1, wherein said flexible member is provided with a thickness in the range of 50 to 200 microns.
Claim 7
Dependent Claim
16 words
An electrophotographic process according to the claim 1, wherein said flexible member is a net-like member.
Claim 8
Dependent Claim
32 words
An electrophotographic process according to the claim 1, wherein said flexible member is composed of a woven textile of monofilaments of any of polyamide, polyester, polypropylene, polyether and polyvinyl alcohol synthetic fiber.
Claim 9
Dependent Claim
25 words
An electrophotographic process according to the claim 1, wherein said process is conducted at a process speed in the range of 150 to 300 mm/sec.
Claim 10
Dependent Claim
28 words
An electrophotographic process according to the claim 1, wherein the development of said electrostatic latent image is conducted under a bias potential applied to said elastic rotary member.
References Cited (Backward Citations)
DE949710C
Cited
US4181094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |