US4525056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing means for electrostatic latent image
Assignee: Konica Minolta Inc
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Filing: 1982-06-09
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Granted: 1985-06-25
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Expires: 2002-06-09
Abstract
Abstract A developing means for an electrostatic latent image has, within a non-magnetic developer transport member, plural magnets arranged in series in a defined area between a develops layer thickness regulating member and a developing area opposite an image forming member so as to generate a magnetic flux distribution having a pair of homopolar peaks for eliminating a density uneveness of the developer layer on said transport member.
Inventors
- 👤 Masahiko Itaya
- 👤 Satoshi Haneda
- 👤 Makoto Tomono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:48
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A developing means for developing an electrostatic latent image on a developing area of an image forming member comprising a non-magnetic developer transport member, a series of magnets arranged inside said non-magnetic transport member, and a developer layer thickness regulating member for regulating a developer layer on the non-magnetic developer transport member, wherein a plurality of said magnets is arranged in series in a defined area between the developer layer thickness regulating member and said developing area opposite said image forming member so as to generate a magnetic flux distribution having a pair of homopolar peaks for eliminating a density unevenness of the developer layer on said transport member.
Claim 2
Dependent Claim
109 words
A developing means for developing an electrostatic latent image on a developing area of an image forming member comprising a non-magnetic developer transport member, a series of magnets arranged inside said non-magnetic transport member, and a developer layer thickness regulating member for regulating a developer layer on the non-magnetic developer transport member, wherein a plurality of said magnets is arranged in series in a defined area between the developer layer thickness regulating member and said developing area opposite said image forming member so as to generate a magnetic flux distribution having a pair of homopolar peaks for eliminating a density unevenness of the developer layer on said transport member.
Claim 3
Dependent Claim
21 words
A developing means according to claim 1, further comprising means for supplying a one-component magnetic developer to form said developer layer.
Claim 4
Dependent Claim
26 words
A developing means according to claim 1, further comprising means for supplying a one-component magnetic developer comprising a magnetite and a resin to said developer layer.
Claim 5
Dependent Claim
57 words
A developing means according to claim 1, wherein a rate of the minimum value taken between two homopolar peaks to the values of said two homopolar peaks in the magnetic flux distribution of the normal line produced on the non-magnetic developer transport member is within the range between not less than 20% and not more than 95%.
Claim 6
Dependent Claim
18 words
A developing means according to claim 1, wherein said non-magnetic developer transport member is a cylindrical developing sleeve.
Claim 7
Dependent Claim
18 words
A developing means according to claim 1, wherein said developer layer thickness regulating member is a doctor blade.
Claim 8
Dependent Claim
22 words
A developing means according to claim 1, wherein said magnetic flux density of magnets arranged in series adjacent are 400-1000 gauss respectively.
References Cited (Backward Citations)
US4030447A
Cited
US4168901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |