Patent US4557992A successfully refreshed from Google Patents.
US4557992A
Expired / Lapsed
US
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Developing method
Assignee: Konica Minolta Inc
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Filing: 1984-03-26
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Granted: 1985-12-10
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Expires: 2004-03-26
Abstract
Abstract A developing method wherein a developer layer formed on a developer feeding carrier is conveyed, into an oscillating electric field, and an electrostatic latent image on an image retainer is developed by the developer of the developer layer inside the oscillating electric field. The developer has carrier particles and toner particles and the average particle size of the carrier particles is from 5 to 50 μm. The average particle size of the toner particles is up to 20 μm. The carrier particle and the toner particle are sphered.
Inventors
- 👤 Satoshi Haneda
- 👤 Seiichiro Hiratsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0907; G03G13/00; G03G13/06; G03G13/08; G03G13/09
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
101 words
A developing method comprising the steps of supplying a developer having magnetic carrier particles and toner particles on a developer feeding carrier to form a developer layer, the average particle size of the carrier particles being from 5 to 50 μm, and the average particle size of the toner particles being up to 20 μm, conveying the developer layer into an oscillating electric field, and developing a latent image on an image retainer by the developer inside the oscillating electric field, the thickness of said developer layer being smaller than the distance between the developer feeding carrier and the image retainer.
Claim 2
Dependent Claim
101 words
A developing method comprising the steps of supplying a developer having magnetic carrier particles and toner particles on a developer feeding carrier to form a developer layer, the average particle size of the carrier particles being from 5 to 50 μm, and the average particle size of the toner particles being up to 20 μm, conveying the developer layer into an oscillating electric field, and developing a latent image on an image retainer by the developer inside the oscillating electric field, the thickness of said developer layer being smaller than the distance between the developer feeding carrier and the image retainer.
Claim 3
Dependent Claim
13 words
A developing method according to claim 1 wherein the carrier particle is sphered.
Claim 4
Dependent Claim
13 words
A developing method according to claim 1 wherein the toner particle is sphered.
Claim 5
Dependent Claim
18 words
A developing method according to claim 1 wherein the carrier particles comprise magnetic particles and a thermoplastic resin.
Claim 6
Dependent Claim
16 words
A developing method according to claim 1 wherein the toner particle is a toner for pressure-fixing.
Claim 7
Dependent Claim
17 words
A developing method according to claim 1 wherein the developer feeding carrier has a rotary magnet therein.
Claim 8
Dependent Claim
19 words
A developing method according to claim 1 wherein the frequency of the oscillating electric field is 100 Hz-10 KHz.
Claim 9
Dependent Claim
20 words
A developing method according to claim 1 wherein the frequency of the oscillating electric field is preferably 1 KHz-5 KHz.
Claim 10
Dependent Claim
13 words
A developing method according to claim 1 wherein the toner particle is magnetic.
Claim 11
Dependent Claim
13 words
A developing method according to claim 1 wherein the toner particle is non-magnetic.
Claim 12
Dependent Claim
27 words
A developing method according to claim 1 wherein the carrier particle is made of magnetic particles and insulating material of more than 10 8 Ohm-cm electric resistivity.
Claim 13
Dependent Claim
24 words
A developing method according to claim 1 wherein the carrier particle is sphered, and the carrier particles comprise magnetic particles and a thermoplastic resin.
Claim 14
Dependent Claim
79 words
A developing method comprising the steps of supplying a developer having magnetic carrier particles and toner particles on a developer feeding carrier to form a developer layer, conveying the developing layer into an oscillating electric field provided by a control electrode for controlling the fly of the toner particles in a developing region between the developer feeding carrier and the image retainer, and developing a latent image on an image retainer by the developer inside the oscillating electric field.
Claim 15
Dependent Claim
79 words
A developing method comprising the steps of supplying a developer having magnetic carrier particles and toner particles on a developer feeding carrier to form a developer layer, conveying the developing layer into an oscillating electric field provided by a control electrode for controlling the fly of the toner particles in a developing region between the developer feeding carrier and the image retainer, and developing a latent image on an image retainer by the developer inside the oscillating electric field.
Claim 16
Dependent Claim
105 words
A developing method comprising the steps of supplying a developer having magnetic carrier particles and toner particles on a developer feeding carrier to form a developer layer, conveying the developer layer into an oscillating electric field, and developing a latent image on an image retainer by the developer inside the oscillating electric field, the thickness of said developer layer being smaller than the distance between the developer feeding carrier and the image retainer, said developing being carried out in said oscillating electric field so that only toner particles among carrier particles and toner particles are oscillated and carrier particles do not contact said image retainer.
Claim 17
Dependent Claim
105 words
A developing method comprising the steps of supplying a developer having magnetic carrier particles and toner particles on a developer feeding carrier to form a developer layer, conveying the developer layer into an oscillating electric field, and developing a latent image on an image retainer by the developer inside the oscillating electric field, the thickness of said developer layer being smaller than the distance between the developer feeding carrier and the image retainer, said developing being carried out in said oscillating electric field so that only toner particles among carrier particles and toner particles are oscillated and carrier particles do not contact said image retainer.
Claim 18
Dependent Claim
20 words
A developing method according to claim 14 wherein the frequency of the oscillating electric field is preferably 1 KHz-5 KHz.
Claim 19
Dependent Claim
22 words
A developing method according to claim 14 wherein the average particle size of the carrier particles is from 4 to 50 μm.
Claim 20
Dependent Claim
21 words
A developing method according to claim 14 wherein the average particle size of the toner particles is up to 20 μm.
References Cited (Backward Citations)
US4336318A
Cited
US4450220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |