Patent US4450220A successfully refreshed from Google Patents.
US4450220A
Expired / Lapsed
US
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Method of charging electrostatic developer
Assignee: Konica Minolta Inc
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Filing: 1982-02-18
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Granted: 1984-05-22
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Expires: 2002-02-18
Abstract
Abstract A charging method of an electrostatic image developer which makes it possible to electrically charge an insulating one-component developer or a two-component developer consisting of a toner and a carrier to a desired charged state and which comprises introducing the developer into a charging space between a pair of sheet-like charging members opposing each other in which space an alternating field is formed, and oscillating the developer by means of the alternating field for charging it. A developing method of a non-contact or contact system which develops the electrostatic image by use of the developer charged electrically by the above-mentioned charging method.
Inventors
- 👤 Satoshi Haneda
- 👤 Takashi Itoh
- 👤 Ken Nakamura
- 👤 Makoto Tomono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0907; G03G15/065; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
123 words
A method of electrically charging a particulate developer comprising an electrically insulating toner for use in developing an electrostatic latent image comprising: providing said developer; providing oppositely disposed charging members defining a charging space therebetween: introducing said developer into said charging space which is provided between said charging members, generating an a.c. field in said charging space having a voltage below the corona discharge level and having a frequency at which said developer can move by applying an a.c. voltage to said charging members, and oscillating said developer by said a.c. field in said charging space between said charging members so that said developer becomes electrically charged due to friction resulting from developer particles impinging against each other and against said charging members.
Claim 2
Independent Claim
123 words
A method of electrically charging a particulate developer comprising an electrically insulating toner for use in developing an electrostatic latent image comprising: providing said developer; providing oppositely disposed charging members defining a charging space therebetween: introducing said developer into said charging space which is provided between said charging members, generating an a.c. field in said charging space having a voltage below the corona discharge level and having a frequency at which said developer can move by applying an a.c. voltage to said charging members, and oscillating said developer by said a.c. field in said charging space between said charging members so that said developer becomes electrically charged due to friction resulting from developer particles impinging against each other and against said charging members.
Claim 3
Dependent Claim
25 words
A method of electrically charging according to claim 1, wherein said developer is a two-component developer consisting essentially of the insulating toner and a carrier.
Claim 4
Dependent Claim
18 words
A method of electrically charging according to claim 1, wherein said insulating toner is an insulating magnetic toner.
Claim 5
Dependent Claim
18 words
A method of electrically charging according to claim 3, wherein said insulating magnetic toner contains a magentic substance.
Claim 6
Dependent Claim
28 words
A method of electrically charging according to claim 1, 2, 3, or 4, wherein said a.c. field is generated by an a.c. voltage superposed with a d.c. voltage.
Claim 7
Dependent Claim
24 words
A method of electrically charging according to claim 1, 2, 3, or 4, wherein said charging members are electrodes for generating said a.c. field.
Claim 8
Dependent Claim
23 words
A method of electrically charging according to claim 1, 2, 3, or 4, wherein the thickness of said charging space is substantially uniform.
Claim 9
Dependent Claim
16 words
A method of electrically charging according to claim 2, wherein said carrier is an insulating carrier.
Claim 10
Independent Claim
132 words
A method for developing an electrostatic latent image comprising: providing a developer comprising electrically insulating particles; providing oppositely disposed charging members defining a charging space therebetween; providing an electrostatic latent image; introducing said developer into said charging space which is provided between said charging members, generating an a.c. field in said charging space having a voltage below the corona discharge level and having a frequency at which said developer can move by applying an a.c. voltage to said charging members, oscillating and electrically charging said developer by said a.c. field in said charging space between said charging members so that said developer becomes electrically charged due to friction resulting from developer particles impinging against each other and against said charging members, and developing said electrostatic latent image by said electrically charged developer.
Claim 11
Independent Claim
132 words
A method for developing an electrostatic latent image comprising: providing a developer comprising electrically insulating particles; providing oppositely disposed charging members defining a charging space therebetween; providing an electrostatic latent image; introducing said developer into said charging space which is provided between said charging members, generating an a.c. field in said charging space having a voltage below the corona discharge level and having a frequency at which said developer can move by applying an a.c. voltage to said charging members, oscillating and electrically charging said developer by said a.c. field in said charging space between said charging members so that said developer becomes electrically charged due to friction resulting from developer particles impinging against each other and against said charging members, and developing said electrostatic latent image by said electrically charged developer.
Claim 12
Dependent Claim
23 words
A method for developing an electrostatic latent image according to claim 9, wherein said developer is a one-component developer consisting of a toner.
Claim 13
Dependent Claim
21 words
A method for developing an electrostatic latent image according to claim 10, wherein said insulating magnetic toner contains a magnetic substance.
Claim 14
Dependent Claim
26 words
A method for developing an electrostatic latent image according to claim 9, wherein said developer is a two-component developer consisting of a toner and a carrier.
Claim 15
Dependent Claim
19 words
A method for developing an electrostatic latent image according to claim 12, wherein said carrier is an insulating carrier.
Claim 16
Independent Claim
32 words
A method for developing an electrostatic latent image according to claims 9, 10, 11, 12 or 13, wherein said a.c. field is generated by an a.c. voltage superposed with a d.c. voltage.
Claim 17
Dependent Claim
38 words
A method for developing an electrostatic latent image according to claim 9, wherein said a.c. field is generated by an a.c. voltage superimposed with a d.c. voltage and said charging members are electrodes for generating said a.c. field.
Claim 18
Independent Claim
28 words
A method for developing an electrostatic latent image according to claims 9, 10, 11, 12, 13 or 15, wherein the thickness of said charging space is substantially uniform.
Claim 19
Independent Claim
49 words
A method for developing an electrostatic latent image according to claims 9, 10, 11, 12, 13 or 15, wherein further comprises: moving at least one of said charging members along a passage reaching a developing region, and transferring said charged developer into said developing region by said charging member.
Claim 20
Dependent Claim
25 words
A method for developing an electrostatic latent image according to claim 9, wherein said developing is carried out in accordance with a non-contact developing system.
Claim 21
Dependent Claim
23 words
A method for developing an electrostatic latent image according to claim 9, wherein one of said charging members is a developer transfer member.
Claim 22
Dependent Claim
36 words
A method for developing an electrostatic latent image according to claim 17, further comprising: introducing said developer into said charging space, and transferring said charged developer into a developing region in which the developing is effected.
Claim 23
Dependent Claim
47 words
A method for developing an electrostatic latent image according to claim 19, wherein said developing is effected under such a state in which a voltage is applied across the developer transfer member and an electrostatic latent image supporting member for supporting said latent image to be developed.
Claim 24
Dependent Claim
20 words
A method for developing an electrostatic latent image according to claim 21, wherein said supporting member is a photosensitive member.
Claim 25
Dependent Claim
25 words
A method for developing an electrostatic latent image according to claim 9, wherein said developing is carried out in accordance with a contact developing system.
Claim 26
Dependent Claim
23 words
A method for developing an electrostatic latent image according to claim 9, wherein one of said charging members is a developer transfer member.
Claim 27
Dependent Claim
36 words
A method for developing an electrostatic latent image according to claim 23, further comprising: introducing said developer into said charging space, and transferring said charged developer into a developing region in which the developing is effected.
Claim 28
Dependent Claim
47 words
A method for developing an electrostatic latent image according to claim 25, wherein said developing is effected under such a state in which a voltage is applied across the developer transfer member and an electrostatic latent image supporting member for supporting said latent image to be developed.
Claim 29
Dependent Claim
20 words
A method for developing an electrostatic latent image according to claim 26, wherein said supporting member is a photosensitive member.
Claim 30
Dependent Claim
27 words
A method for developing an electrostatic latent image according to claim 12 or 13, wherein said developing is carried out in accordance with a non-contact developing system.
Claim 31
Dependent Claim
25 words
A method for developing an electrostatic latent image according to claim 12 or 13, wherein one of said charging members is a developer transfer member.
Claim 32
Dependent Claim
36 words
A method for developing an electrostatic latent image according to claim 28, further comprising: introducing said developer into said charging space, and transferring said charged developer into a developing region in which the developing is effected.
Claim 33
Dependent Claim
47 words
A method for developing an electrostatic latent image according to claim 30, wherein said developing is effected under such a state in which a voltage is applied across the developer transfer member and an electrostatic latent image supporting member for supporting said latent image to be developed.
Claim 34
Dependent Claim
20 words
A method for developing an electrostatic latent image according to claim 31, wherein said supporting member is a photosensitive member.
Claim 35
Dependent Claim
27 words
A method for developing an electrostatic latent image according to claim 12 or 13, wherein said developing is carried out in accordance with a contact developing system.
Claim 36
Dependent Claim
25 words
A method for developing an electrostatic latent image according to claim 12 or 13, wherein one of said charging members is a developer transfer member.
Claim 37
Dependent Claim
36 words
A method for developing an electrostatic latent image according to claim 32, further comprising: introducing said developer into said charging space, and transferring said charged developer into a developing region in which the developing is effected.
Claim 38
Dependent Claim
47 words
A method for developing an electrostatic latent image according to claim 35, wherein said developing is effected under such a state in which a voltage is applied across the developer transfer member and an electrostatic latent image supporting member for supporting said latent image to be developed.
Claim 39
Dependent Claim
20 words
A method for developing an electrostatic latent image according to claim 36, wherein said supporting member is a photosensitive member.
Claim 40
Dependent Claim
22 words
A method of an electrically charging according to claim 1, wherein said insulating toner has resistivity of at least 10 10 Ohm.cm.
Claim 41
Dependent Claim
24 words
A method for developing an electrostatic latent image according to claim 9, wherein said insulating toner has resistivity of at least 10 10 Ohm.cm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |