US5235387A
Expired / Lapsed
US
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Developing apparatus using a one-component nonmagnetic toner
Assignee: Toshiba Corp
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Filing: 1992-05-21
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Granted: 1993-08-10
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Expires: 2012-05-21
Abstract
Abstract On the surface of a developing roller disposed closely to a photosensitive drum, a toner supplied from a toner container to the surface is spread into a thin layer by a toner distribution and charging blade. The triboelectric charge, q 1 , of the toner and the triboelectric charge, q 2 , of the surface of the toner distribution and charging blade are equalized in polarity and made to satisfy a relation, |q 2 |<|q 1 |. The triboelectric charge, q 3 , of the surface of the developing roller is made to satisfy a relation, -4.0≦q 1 /q 3 ≦-1.2. The triboelectric charge of the toner, q 1 , and the triboelectric charge, q 4 , of the surface of a recovery blade for recovering the residue of toner adhering to the developing roller are equalized in polarity and, at the same time, made to satisfy a relation, |q 4 |<|q 1 |. The developing apparatus constructed of the component members satisfying these conditions constantly allows easy and infallible impartation of an appropriate triboelectric charge to the toner in an operation of supplying a thin layer of the toner to an electrostatic latent image carried on the sensitive drum thereby visualizing the electrostatic latent image.
Inventors
- 👤 Shuitsu Sato
- 👤 Mitsunaga Saito
- 👤 Hiroki Takano
- 👤 Masahiro Hosoya
- 👤 Yukihiro Osugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:16
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/02; G03G13/00; G03G13/06; G03G13/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
142 words
A developing apparatus comprising; a developing roller, toner supply means for supplying a toner to a peripheral surface of said developing roller, a toner distribution and charging blade for spreading said toner supplied to said peripheral surface of said developing roller into a thin layer, and development means for causing toner particles in said thin layer of toner formed on the peripheral surface of said developing roller to be electrostatically deposited on an electrostatic latent image carried on a photosensitive drum and developed in a visible image thereon, a frictionally produced tribroelectric charge q 1 of said toner, a frictionally produced tribroelectric charge q 2 of a surface of said toner distribution and charging blade, wherein said toner is a one-component nonmagnetic toner, q 1 and q 2 are equal in polarity, and the relation, |q 2 |<q 1 | is satisfied.
Claim 2
Dependent Claim
142 words
A developing apparatus comprising; a developing roller, toner supply means for supplying a toner to a peripheral surface of said developing roller, a toner distribution and charging blade for spreading said toner supplied to said peripheral surface of said developing roller into a thin layer, and development means for causing toner particles in said thin layer of toner formed on the peripheral surface of said developing roller to be electrostatically deposited on an electrostatic latent image carried on a photosensitive drum and developed in a visible image thereon, a frictionally produced tribroelectric charge q 1 of said toner, a frictionally produced tribroelectric charge q 2 of a surface of said toner distribution and charging blade, wherein said toner is a one-component nonmagnetic toner, q 1 and q 2 are equal in polarity, and the relation, |q 2 |<q 1 | is satisfied.
Claim 3
Dependent Claim
130 words
A developing apparatus comprising; a developing roller, toner supply means for supplying a toner to a peripheral surface of said developing roller, a toner distribution and charging blade for spreading said toner supplied to said peripheral surface of said developing roller into a thin layer, and development means for causing toner particles in said thin layer of toner formed on the peripheral surface of said developing roller to be electrostatically deposited on an electrostatic latent image carried on a photosensitive drum and developed in a visible image thereon, a frictionally produced tribroelectric charge q 3 of said toner, a frictionally produced tribroelectric charge q 1 of a surface of said developing roller, wherein said toner is a one-component nonmagnetic toner and the relation -4.0≦q 1 /q 3 ≦-1.2 is satisfied.
Claim 4
Dependent Claim
130 words
A developing apparatus comprising; a developing roller, toner supply means for supplying a toner to a peripheral surface of said developing roller, a toner distribution and charging blade for spreading said toner supplied to said peripheral surface of said developing roller into a thin layer, and development means for causing toner particles in said thin layer of toner formed on the peripheral surface of said developing roller to be electrostatically deposited on an electrostatic latent image carried on a photosensitive drum and developed in a visible image thereon, a frictionally produced tribroelectric charge q 3 of said toner, a frictionally produced tribroelectric charge q 1 of a surface of said developing roller, wherein said toner is a one-component nonmagnetic toner and the relation -4.0≦q 1 /q 3 ≦-1.2 is satisfied.
Claim 5
Dependent Claim
164 words
A developing apparatus comprising; a developing roller, toner supply means for supplying a toner to a peripheral surface of said developing roller, a toner distribution and charging blade for spreading said toner supplied to said peripheral surface of said developing roller into a thin layer, development means for causing toner particles in said thin layer of toner formed on the peripheral surface of said developing roller to be electrostatically deposited on an electrostatic latent image carried on a photosensitive drum and developed in a visible image thereon, and a recovery blade for recovering the residue of the toner deposited on said developing roller after said deposition of said toner on said photosensitive drum, a frictionally produced tribroelectric charge q 1 of aid toner, a frictionally produced tribroelectric charge q 4 of a surface of said recovery blade, wherein said toner is a one-component nonmagnetic toner, q 1 and q 4 are equal in polarity and the relation, |q 4 |<|q 1 | is satisfied.
Claim 6
Dependent Claim
164 words
A developing apparatus comprising; a developing roller, toner supply means for supplying a toner to a peripheral surface of said developing roller, a toner distribution and charging blade for spreading said toner supplied to said peripheral surface of said developing roller into a thin layer, development means for causing toner particles in said thin layer of toner formed on the peripheral surface of said developing roller to be electrostatically deposited on an electrostatic latent image carried on a photosensitive drum and developed in a visible image thereon, and a recovery blade for recovering the residue of the toner deposited on said developing roller after said deposition of said toner on said photosensitive drum, a frictionally produced tribroelectric charge q 1 of aid toner, a frictionally produced tribroelectric charge q 4 of a surface of said recovery blade, wherein said toner is a one-component nonmagnetic toner, q 1 and q 4 are equal in polarity and the relation, |q 4 |<|q 1 | is satisfied.
Claim 7
Dependent Claim
41 words
A developing apparatus according to claim 1, wherein said development means brings said toner into contact with said electrostatic latent image deposited on said photosensitive drum and said toner is electrostatically attached to said electrostatic latent image to develop the image.
Claim 8
Dependent Claim
42 words
A developing apparatus according to claim 2, wherein said development means brings said toner into contact with said electrostatic latent image deposited on said photosensitive drum and said toner is electrostatically attached to said electrostatic latent image to develop the visible image.
Claim 9
Dependent Claim
41 words
A developing apparatus according to claim 3, wherein said development means brings said toner into contact with said electrostatic latent image deposited on said photosensitive drum and said toner is electrostatically attached to said electrostatic latent image to develop the image.
Claim 10
Dependent Claim
34 words
A developing apparatus according to claim 1, wherein a frictionally produced tribroelectric charge of a surface of said developing roller, q 3 , is provided that satisfies the relationship -4.0≦q 1 /q 3 ≦-1.2.
Claim 11
Dependent Claim
44 words
A developing apparatus according to claim 3, wherein a frictionally produced tribroelectric charge of said toner distribution and charging blade, q 2 , is provided which satisfies, q 1 and q 2 are equal in polarity and the relationship, |q 2 |<|q 1 |.
Claim 12
Dependent Claim
34 words
A developing apparatus according to claim 3, wherein a frictionally produced tribroelectric charge of a surface of said developing roller, q 3 , is provided which satisfies the relationship, -4.0≦q 1 /q 3 ≦-1.2.
Claim 13
Dependent Claim
70 words
A developing apparatus according to claim 3, wherein a frictionally produced tribroelectric charge of a surface of said toner distribution and charging blade, q 2 , and a frictionally produced tribroelectric charge of a surface of said developing roller, q 3 , is provided which satisfies q 1 and q 2 are equal in polarity and the relationship, |q 2 |< |q 1 51 , -4.0≦q 1 /q 3 ≦-1.2.
Claim 14
Dependent Claim
29 words
A developing apparatus according to claim 1, wherein q 1 and q 2 are respectively in ranges of -750 nC<q 1 <-140 nC and -200 nC<q 2 -50 nC.
Claim 15
Dependent Claim
31 words
A developing apparatus according to claim 1, wherein q 1 and q 2 are respectively in ranges of +50 nC<q 1 <+400 nC and +10 nC <q 2 21 +300 nC.
Claim 16
Dependent Claim
30 words
A developing apparatus according to claim 2, wherein q 1 and q 3 are respectively in ranges of -750 nC<q 1 <-140 nC and +300 nC ≦q 3 ≦+625 nC.
Claim 17
Dependent Claim
29 words
A developing apparatus according to claim 2, wherein q 1 and q 3 are respectively in ranges of +50 nC<q 1 <+400 nC and -300 nC≦q 3 ≦-50 nC.
Claim 18
Dependent Claim
30 words
A developing apparatus according to claim 3, wherein q 1 and q 4 are respectively in the ranges of -750 nC<q 1 <-140 nC and -200 nC≦q 4 ≦-50 nC.
Claim 19
Dependent Claim
29 words
A developing apparatus according to claim 3, wherein q 1 and q 4 are respectively in ranges of +50 nC<q 1 <+400 nC and +10 nC≦q 4 ≦+300 nC.
Claim 20
Dependent Claim
47 words
A developing apparatus according to claim 10, wherein q 1 , q 2 , q 3 and q 4 , are respectively in ranges of -750 nC<q 1 <-140 nC, -200 nC<q 2 <-50 nC, +300 nC≦q 3 ≦+625 nC, and -200 nC ≦q 4 ≦-50 nC.
Claim 21
Dependent Claim
48 words
A developing apparatus according to claim 10, wherein q 1 , q 2 , q 3 and q 4 are respectively in ranges of +50 nC <q 1 +400 nC, +10 nC <q 2 <+300 nC, -300 nC≦q 3 ≦-50 nC, and +10 nC ≦q 4 ≦+300 nC.
References Cited (Backward Citations)
US3731146A
Cited
US4100884A
Cited
US4522907A
Cited
US4336318A
Cited
US4930438A
Cited
US4760422A
Cited
US4833058A
Cited
US4841331A
Cited
US4847653A
Cited
US5008708A
Cited
US4967231A
Cited
US5051332A
Cited
US5066982A
Cited
US5110705A
Cited
US5060021A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |