US4081571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for developing electrostatic latent images
Assignee: Kyocera Mita Industrial Co Ltd
•
Filing: 1975-07-29
•
Granted: 1978-03-28
•
Expires: 1995-07-29
Abstract
Abstract Method and apparatus for developing an electrostatic latent image formed on the surface of an electrostatic latent image-bearing material by applying a powdery developer, wherein the surface of a developer-retaining member retaining a layer of the powdery developer thereon is brought into rolling contact with the surface of the image-bearing material in such a relation that a reservoir zone of the developer is formed at least upstream of the zone of rolling contact between the two surfaces, and the developer in the reservoir zone is physically disturbed.
Inventors
- 👤 Hitoshi Nishihama
- 👤 Katsuhiko Gotoda
- 👤 Minoru Motomura
- 👤 Takanobu Nakajima
- 👤 Tatsuo Aizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0914; G03G15/082
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
97 words
A method for developing an electrostatic latent image formed on the surface of an image-bearing material by applying a powdery developer thereto, which comprises bringing the surface of a developer-retaining member retaining a layer of the powdery developer on its surface into rolling contact with the surface of said image-bearing material through the developer in such a relation that a reservoir zone of the developer is formed upstream of and adjacent to the rolling contact zone of both surfaces, and physically disturbing the developer in said reservoir zone to cause the developer to make an irregular motion.
Claim 2
Independent Claim
97 words
A method for developing an electrostatic latent image formed on the surface of an image-bearing material by applying a powdery developer thereto, which comprises bringing the surface of a developer-retaining member retaining a layer of the powdery developer on its surface into rolling contact with the surface of said image-bearing material through the developer in such a relation that a reservoir zone of the developer is formed upstream of and adjacent to the rolling contact zone of both surfaces, and physically disturbing the developer in said reservoir zone to cause the developer to make an irregular motion.
Claim 3
Dependent Claim
62 words
The method of claim 1 wherein said rolling contact is effected so that the following relation is met d.sub.o ≧ d wherein d o is the minimum thickness of the layer of the developer retained on the surface of the developer-retaining member, and d is the minimum distance between the surface of the developer-retaining member and the surface of the image-bearing material.
Claim 4
Dependent Claim
76 words
The method of claim 1 wherein said developer-retaining member is of a rotatable hollow cylindrical shape and said image-bearing material is sheet-like, and said developer-retaining member is rotated at a predetermined speed and simultaneously said image-bearing material is moved relative to the developer-retaining member at substantially the same speed as the surface speed of the developer-retaining member, thereby to bring the surface of the developer-retaining member into rolling contact with the surface of the image-bearing material.
Claim 5
Dependent Claim
68 words
The method of claim 1 wherein said developer-retaining member is of a rotatable hollow cylindrical shape and the image-bearing material is a photosensitive plate mounted on the peripheral surface of a rotary drum, and the developer-retaining member and the rotary drum are rotated in opposite directions to each other thereby to bring the surface of the developer-retaining member into rolling contact with the surface of the image-bearing material.
Claim 6
Dependent Claim
31 words
The method of claim 3 wherein the developer in the reservoir zone is disturbed magnetically by rotating a roll-like permanent magnet disposed within said developer-retaining member and being rotatable independently therefrom.
Claim 7
Dependent Claim
49 words
The method of claim 5 wherein said permanent magnet has a plurality of poles of opposite polarities arranged alternately on its periphery, and the developer in the reservoir is magnetically disturbed by rotating the roll-like permanent magnet in a direction opposite to the rotating direction of the developer-retaining member.
Claim 8
Dependent Claim
41 words
The method of claim 6 wherein the developer is fed upstream of the rolling contact zone to the surface of the developer-retaining surface thereby to adjust the amount of the developer to be retained on the surface of the developer-retaining member.
Claim 9
Dependent Claim
75 words
The method of claim 7 wherein the minimum thickness (d o ) of the developer layer to be retained on the surface of the developer-retaining member is adjusted to about 0.3 to 2.5 mm, the minimum distance (d) between the surface of the developer-retaining member and the surface of the image-bearing material is adjusted to about 0.1 to 1.0 mm, and the roll-like permanent magnet is rotated at a speed of at least 150 rpm.
Claim 10
Dependent Claim
20 words
The method of claim 8 wherein said roll-like permanent magnet is rotated at a speed of 300 to 400 rpm.
Claim 11
Dependent Claim
50 words
The method of claim 1 wherein the developer is a relatively conductive one-component developer having a resistivity of not more than about 10 13 ohms.cm, and said developer-retaining member has an insulating coating having a resistance of about 10 3 to 10 9 ohms per cm 2 on its surface.
Claim 12
Dependent Claim
20 words
The method of claim 10 wherein said developer has a resistivity of not more than 5 × 10 11 ohms.cm.
Claim 13
Dependent Claim
23 words
The method of claim 10 wherein said coating has a resistance of about 10 4 to 10 7 ohms per cm 2 .
Claim 14
Dependent Claim
13 words
The method of claim 10 wherein said coating is a metallic oxide coating.
Claim 15
Dependent Claim
11 words
The method of claim 10 wherein the developer-retaining member is grounded.
Claim 16
Independent Claim
163 words
A method for developing an electrostatic latent image formed on the surface of an image-bearing material by applying a powdery developer thereto, which comprises magnetically retaining a layer of a relatively conductive one-component developer having a resistivity of not more than 10 13 ohms.cm on the surface of a hollow cylindrical developer-retaining member having an insulating coating with a resistance of 10 3 to 10 9 ohms per cm 2 and being kept at a grounded potential by means of a magnet disposed within said developer-retaining member and having a plurality of poles of opposite polarities arranged alternately on its periphery; bringing the surface of said developer-retaining member into rolling contact with the surface of said image-bearing material through a layer of the developer in such a relation that a reservoir zone of the developer is formed at least upstream of and adjacent to the rolling contact zone of both surfaces; and physically disturbing the developer in said reservoir by rotating said magnet.
Claim 17
Independent Claim
163 words
A method for developing an electrostatic latent image formed on the surface of an image-bearing material by applying a powdery developer thereto, which comprises magnetically retaining a layer of a relatively conductive one-component developer having a resistivity of not more than 10 13 ohms.cm on the surface of a hollow cylindrical developer-retaining member having an insulating coating with a resistance of 10 3 to 10 9 ohms per cm 2 and being kept at a grounded potential by means of a magnet disposed within said developer-retaining member and having a plurality of poles of opposite polarities arranged alternately on its periphery; bringing the surface of said developer-retaining member into rolling contact with the surface of said image-bearing material through a layer of the developer in such a relation that a reservoir zone of the developer is formed at least upstream of and adjacent to the rolling contact zone of both surfaces; and physically disturbing the developer in said reservoir by rotating said magnet.
Claim 18
Dependent Claim
27 words
The method of claim 15 wherein the surface coating of said developer-retaining member has a resistance of 10 4 to 10 7 ohms per cm 2 .
Claim 19
Dependent Claim
20 words
The method of claim 15 wherein said developer has a resistance of not more than 5 × 10 11 ohms.cm.
Claim 20
Dependent Claim
35 words
The method of claim 15 wherein said magnet is a roll-like permanent magnet having at least 6 poles and a magnetic flux density on the surface of said developer-retaining member of at least 500 gauss.
Claim 21
Dependent Claim
75 words
The method of claim 18 wherein the minimum thickness (d o ) of the developer layer to be retained on the surface of the developer-retaining member is adjusted to about 0.3 to 2.5 mm, the minimum distance (d) between the surface of the developer-retaining member and the surface of the image-bearing material is adjusted to about 0.1 to 1.0 mm, and the roll-like permanent magnet is rotated at a speed of at least 150 rpm.
Claim 22
Dependent Claim
19 words
The method of claim 19 wherein the rotating speed of the roll-like permanent magnet is 300 to 400 rpm.
Claim 23
Dependent Claim
13 words
The method of claim 15 wherein said coating is a metallic oxide coating.
References Cited (Backward Citations)
US3793985A
Cited
US3834350A
Cited
US3703395A
Cited
US3552355A
Cited
US3641977A
Cited
US3666518A
Cited
US3754963A
Cited
US3839992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |