US4336318A
Expired / Lapsed
US
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Electrostatic image developing method
Assignee: Canon Inc
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Filing: 1980-12-31
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Granted: 1982-06-22
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Expires: 2000-12-31
Abstract
Abstract In a method for developing electrostatic images comprising facing an electrostatic image bearing member bearing electrostatic images on the surface to a support member having a toner particle layer on the surface, when the triboelectric charge of the toner is q(c/g), thickness of the toner particle layer, d(mm), is adjusted to satisfy the following formula: 3×10.sup.-8 <|q.d|<5×10.sup.-6
Inventors
- 👤 Hiroshi Fukumoto
- 👤 Yoshio Takasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:46
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G13/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
A method for developing electrostatic images comprising facing an electrostatic image bearing member bearing electrostatic images on the surface to a support member having a toner particle layer on the surface, characterized in that when the triboelectric charge of the toner is q(c/g), thickness of the toner particle layer, d(mm), is adjusted to satisfy the following formula: 3×10.sup.-8 <|q.d|<5=10.sup.-6
Claim 2
Independent Claim
59 words
A method for developing electrostatic images comprising facing an electrostatic image bearing member bearing electrostatic images on the surface to a support member having a toner particle layer on the surface, characterized in that when the triboelectric charge of the toner is q(c/g), thickness of the toner particle layer, d(mm), is adjusted to satisfy the following formula: 3×10.sup.-8 <|q.d|<5=10.sup.-6
Claim 3
Dependent Claim
29 words
A method according to claim 1 in which the absolute value of triboelectric charge of the toner is in the range of from 1×10 -7 to 4×10 -5 (c/g).
Claim 4
Dependent Claim
18 words
A method according to claim 1 in which the thickness of the toner particle layer, d(mm), is 0.05-0.5.
Claim 5
Dependent Claim
122 words
The developing method according to claim 1, wherein said developing method comprises the steps of: defining a developing zone wherein a latent image bearing member and a non-magnetic conductive member carrying a layer of magnetic toner particles on the surface thereof are disposed in opposed relationship with a clearance between the surface of the latent image bearing member and the surface of the non-magnetic conductive member, the clearance being greater than the thickness of said toner layer so as to create an air gap; providing a magnetic field in said developing zone; moving said latent image bearing member and said non-magnetic conductive member in the same direction; and imparting an alernating electric field sufficient to produce electric fields across said developing clearance.
References Cited (Backward Citations)
US4265997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |