Patent US599296A successfully refreshed from Google Patents.
Patent US4883017A successfully refreshed from Google Patents.
US4883017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing device
Assignee: Minolta Co Ltd
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Filing: 1988-09-01
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Granted: 1989-11-28
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Expires: 2008-09-01
Abstract
Abstract A developing device adjoins a rotatably arranged electrostatic latent image support member, and is internally provided with a rotatably disposed developing roller confronting the electrostatic latent image support member, a cylindrically formed flexible filmy member having a peripheral length being slightly longer than that of the developing roller and loosely mounted around it, a first member for biasing the filmy member against the developing roller to form the slack of the filmy member at a location confronting the electrostatic latent image support member, and a second member for forming a toner layer on an external surface of the filmy member. Wherein, the filmy member has dimensions and a physical property which are satisfied with following equations; 0.05≦E·t 3 ≦10, 2.5≦R≦50, wherein, E, t and R are, respectively, a modulus of longitudinal elasticity, a thickness and a radius of the filmy member.
Inventors
- 👤 Enoguchi Yuji
- 👤 Natsuhara Toshiya
- 👤 Yamamoto Masashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
175 words
A developing device disposed adjacently to a rotatably arranged electrostatic latent image support member, which comprises: a rotatably disposed developing roller confronting said electrostatic latent image support member; a cylindrically formed flexible filmy member having a peripheral length being slightly longer than that of said developing roller and loosely mounted therearound; first means for bringing said filmy member partly into close contact with said developing roller so as to protrude an extra peripheral length portion of said filmy member toward said developing roller so that said extra portion of an external peripheral surface of said filmy member may be brought into contact with said electrostatic latent image support member; and second means for forming a thin layer of charged toner on the external surface of said filmy member brought into contact with said developing roller, dimensions and a physical property of said filmy member being satisfied with following equations: 0.05≦E·t.sup.3 ≦10; 2.5≦R≦50; wherein, E (kg/mm 2 ) is a modulus of longitudinal elasticity and t (mm) is a thickness and R (mm) is a radius.
Claim 2
Dependent Claim
175 words
A developing device disposed adjacently to a rotatably arranged electrostatic latent image support member, which comprises: a rotatably disposed developing roller confronting said electrostatic latent image support member; a cylindrically formed flexible filmy member having a peripheral length being slightly longer than that of said developing roller and loosely mounted therearound; first means for bringing said filmy member partly into close contact with said developing roller so as to protrude an extra peripheral length portion of said filmy member toward said developing roller so that said extra portion of an external peripheral surface of said filmy member may be brought into contact with said electrostatic latent image support member; and second means for forming a thin layer of charged toner on the external surface of said filmy member brought into contact with said developing roller, dimensions and a physical property of said filmy member being satisfied with following equations: 0.05≦E·t.sup.3 ≦10; 2.5≦R≦50; wherein, E (kg/mm 2 ) is a modulus of longitudinal elasticity and t (mm) is a thickness and R (mm) is a radius.
Claim 3
Dependent Claim
27 words
A developing device as claimed in claim 1, wherein a circumferential speed of said filmy member is different from that of said electrostatic latent image support member.
Claim 4
Dependent Claim
27 words
A developing device as claimed in claim 2, wherein said circumferential speed of said filmy member is faster than that of said electrostatic latent image support member.
Claim 5
Dependent Claim
58 words
A developing device as claimed in claim 1, wherein, said filmy member is made of one of a resinous sheet, a resinous sheet with an additive material which is carbon powder, a resinous sheet with additive materials which are carbon powder and fine metallic particles and a resinous sheet with a additive material which is fine metallic particles.
Claim 6
Dependent Claim
19 words
A developing device as claimed in claim 1, wherein said filmy member is made of a filmy metal sheet.
Claim 7
Dependent Claim
36 words
A developing device as claimed in claim 1, wherein said filmy member is made of a laminated sheet comprising said filmy member as claimed in claim 4 and said filmy member as claimed in claim 5.
Claim 8
Dependent Claim
31 words
A developing device as claimed in claim 1, wherein said first means has an internal circular surface which is corresponding a shape of an external peripheral surface of said developing roller.
Claim 9
Dependent Claim
19 words
A developing device as claimed in claim 1, wherein said first means is made of a foamed resinous material.
Claim 10
Dependent Claim
28 words
A developing device as claimed in claim 1, wherein said first means is made of a laminated material comprising a foamed resinous material and a resinous sheet material.
Claim 11
Dependent Claim
78 words
A developing device as claimed in claim 1, wherein said developing roller, said filmy member and said first means are selected to satisfy a relationship of μ1>μ2, where a dynamic coefficient of friction between the external surface of said developing roller and the internal surface of said filmy member is μ1, and that between the external surface of said filmy member and a surface of said first means facing the external surface of said filmy member is μ2.
Claim 12
Dependent Claim
147 words
A developing device disposed adjacently to a rotatably arranged photosensitive member, in which non-magnetic one-component developer is employed, which comprises: a rotatably disposed developing roller confronting said photosensitive member; a cylindrically formed flexible filmy member having a peripheral length being slightly longer than that of said developing roller and loosely mounted therearound; first means for bringing said filmy member partly into close contact with said developing roller so as to protrude an extra peripheral length portion of said filmy member toward said developing roller so that said extra portion of an external peripheral surface of the filmy member may be brought into contact with said photosensitive member; and second means for forming a thin layer of charged toner on the external surface of said filmy member brought into contact with said developing roller, dimentions and a physical property of said filmy member being satisfied with following equations:
Claim 13
Dependent Claim
147 words
A developing device disposed adjacently to a rotatably arranged photosensitive member, in which non-magnetic one-component developer is employed, which comprises: a rotatably disposed developing roller confronting said photosensitive member; a cylindrically formed flexible filmy member having a peripheral length being slightly longer than that of said developing roller and loosely mounted therearound; first means for bringing said filmy member partly into close contact with said developing roller so as to protrude an extra peripheral length portion of said filmy member toward said developing roller so that said extra portion of an external peripheral surface of the filmy member may be brought into contact with said photosensitive member; and second means for forming a thin layer of charged toner on the external surface of said filmy member brought into contact with said developing roller, dimentions and a physical property of said filmy member being satisfied with following equations:
Claim 14
Dependent Claim
27 words
05≦E·t 3 ≦10; 2.5≦R≦50; wherein, E (kg/mm 2 ) is a modulus of longitudinal elasticity and t (mm) is a thickness and R (mm) is a radius.
Claim 15
Dependent Claim
27 words
05≦E·t 3 ≦10; 2.5≦R≦50; wherein, E (kg/mm 2 ) is a modulus of longitudinal elasticity and t (mm) is a thickness and R (mm) is a radius.
References Cited (Backward Citations)
US3945723A
Cited
US4564285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |