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Patent US5077158A successfully refreshed from Google Patents.
US5077158A
Expired / Lapsed
US
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Electrophotographic image-forming process using grey toner
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1990-04-27
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Granted: 1991-12-31
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Expires: 2010-04-27
Abstract
Abstract In forming an image by developing an electrostatic latent image with a grey toner, a mixture of a white toner and a black toner is used as the grey toner and the ratio (D) of the black toner to the entire toner, the developing voltage (DV) and the image density (ID) are set so that the requirement represented by the following formula is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein A 2 is a number of from 0.5 to 2.5, K 2 is a number of from 1 to 2, and K 3 is a number of from 0.001 to 0.01. According to this process, a copy having a grey image area corresponding precisely to the image of an original is obtained.
Inventors
- 👤 Tetsuya Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:38
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G13/00; G03G13/06; G03G13/08; G03G13/09
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A process for forming an image, which comprises developing an electrostatic latent image with a grey toner, wherein a mixture of a white toner and a black toner is used as the grey toner and the ration (D) of the black toner to the entire toner, the developing voltage (DV) and the image density (ID) are set so that the requirement represented by the following formula is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein A 2 is a number of from 0.5 to 2.5, K 2 is a number of from 1 to 2, K 3 is a number of from 0.001 to 0.01.
Claim 2
Dependent Claim
103 words
A process for forming an image, which comprises developing an electrostatic latent image with a grey toner, wherein a mixture of a white toner and a black toner is used as the grey toner and the ration (D) of the black toner to the entire toner, the developing voltage (DV) and the image density (ID) are set so that the requirement represented by the following formula is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein A 2 is a number of from 0.5 to 2.5, K 2 is a number of from 1 to 2, K 3 is a number of from 0.001 to 0.01.
Claim 3
Dependent Claim
31 words
A process according to claim 1, wherein the white toner is composed mainly of a white pigment and a minor amount of a coloring pigment is incorporated in the white toner.
Claim 4
Dependent Claim
14 words
A process according to claim 1, wherein the coloring pigment is a blue pigment.
Claim 5
Dependent Claim
36 words
A process according to and of claims 1 through 3, wherein the white toner and black toner have a conductivity of 1×10 -8 to 1×10 -12 s/cm as measured by using a parallel plate type electrode.
Claim 6
Dependent Claim
26 words
A process according to and of claims 1 through 3, wherein the white and black toners have a triboelectric charge quantity of 10 to 40 μc/g.
Claim 7
Dependent Claim
115 words
An image-forming process comprising developing an electrostatic latent image with a grey toner, wherein a mixture of a white toner and a black toner in which the concentration ratio (D) of the black toner to the entire toner is from 0.01 to 0.5 is used as the grey toner, and the mixed toner is used in an image-forming apparatus provide with control means for cotrolling the developing voltage (DV) and image density (IV) so that the following requirement is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein A 2 is a number of from 0.5 to 2.5, K 2 is a number of from 1 to 2, K 3 is a number of from 0.001 to 0.01.
Claim 8
Dependent Claim
115 words
An image-forming process comprising developing an electrostatic latent image with a grey toner, wherein a mixture of a white toner and a black toner in which the concentration ratio (D) of the black toner to the entire toner is from 0.01 to 0.5 is used as the grey toner, and the mixed toner is used in an image-forming apparatus provide with control means for cotrolling the developing voltage (DV) and image density (IV) so that the following requirement is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein A 2 is a number of from 0.5 to 2.5, K 2 is a number of from 1 to 2, K 3 is a number of from 0.001 to 0.01.
Claim 9
Dependent Claim
144 words
A process for forming an image, which comprises developing an electrostatic latent image with a grey toner, wherein a mixture of a white toner and a black toner is used as the grey toner, and the ratio (D) of the toner to the entire toner, the original density (OD) and the image density (ID) are set so that the requirement represented by the following formula is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein DV is represented by the formula of DV=A 1 ×(1-e -K 1 OD )-B, A 1 is a number of from 400 to 1000, A 2 is a number of from 0.5 to 2.5, K 1 is a number of from 0.5 to 5, K 2 is a number of from 1 to 2, K 3 is a number of from 0.001 to 0.01, and B represents the developing bias voltage (V).
Claim 10
Dependent Claim
144 words
A process for forming an image, which comprises developing an electrostatic latent image with a grey toner, wherein a mixture of a white toner and a black toner is used as the grey toner, and the ratio (D) of the toner to the entire toner, the original density (OD) and the image density (ID) are set so that the requirement represented by the following formula is satisfied: ID=A.sub.2 ×(1-e.sup.-K 2.sup.D)×(1-e.sup.-K 3.sup.DV) wherein DV is represented by the formula of DV=A 1 ×(1-e -K 1 OD )-B, A 1 is a number of from 400 to 1000, A 2 is a number of from 0.5 to 2.5, K 1 is a number of from 0.5 to 5, K 2 is a number of from 1 to 2, K 3 is a number of from 0.001 to 0.01, and B represents the developing bias voltage (V).
References Cited (Backward Citations)
US3060021A
Cited
US3013890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |