US5307127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing apparatus using one component toner with improved flowability
Assignee: Canon Inc
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Filing: 1993-03-01
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Granted: 1994-04-26
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Expires: 2013-03-01
Abstract
Abstract A developing apparatus includes a developer carrying member for supplying a developer to an image bearing member, wherein the developer is a one component developer, and has a flowability index of 5-30%. A developing bias voltage application device applies a developing bias to the developer carrying member, wherein the developing bias application device applies an oscillating bias voltage, including a first peak voltage, for an application period T1, for forming an electric field for urging the developer from the developer carrying member to the image bearing member, and a second peak voltage, for an application period T2, for forming an electric field for urging the developer from the image bearing member to the developer carrying member, wherein T1:T2 satisfies 1:2-1:10.
Inventors
- 👤 Tetsuya Kobayashi
- 👤 Haruo Fujii
- 👤 Motoi Katoh
- 👤 Tatsuya Kobayashi
- 👤 Toshiaki Miyashiro
- 👤 Naoki Enomoto
- 👤 Akihiko Uchiyama
- 👤 Yoshiro Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:14
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0907; G03G15/0806; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0619
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
121 words
A developing apparatus comprising: a developer carrying member for supplying a developer to an image bearing member, wherein the developer is a one component developer, and has a flowability index of 5-30%; and developing bias voltage application means for applying a developing bias to said developer carrying member; wherein said developing bias application means applies an oscillating bias voltage including a first peak voltage, for an application period T1, for forming an electric field for urging the developer from said developer carrying member to said image bearing member, and a second peak voltage, for an application period T2, for forming an electric field for urging the developer from said image bearing member to said developer carrying member, wherein T1:T2 satisfies 1:2-1:10.
Claim 2
Dependent Claim
121 words
A developing apparatus comprising: a developer carrying member for supplying a developer to an image bearing member, wherein the developer is a one component developer, and has a flowability index of 5-30%; and developing bias voltage application means for applying a developing bias to said developer carrying member; wherein said developing bias application means applies an oscillating bias voltage including a first peak voltage, for an application period T1, for forming an electric field for urging the developer from said developer carrying member to said image bearing member, and a second peak voltage, for an application period T2, for forming an electric field for urging the developer from said image bearing member to said developer carrying member, wherein T1:T2 satisfies 1:2-1:10.
Claim 3
Dependent Claim
15 words
An apparatus according to claim 1, wherein the developer is a magnetic one component developer.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 1, wherein the developer is a non-magnetic one component developer.
Claim 5
Dependent Claim
12 words
An apparatus according to claim 1, wherein the flowability index is 8-30%.
Claim 6
Dependent Claim
12 words
An apparatus according to claim 4, wherein the flowability index is 10-25%.
Claim 7
Dependent Claim
52 words
An apparatus according to claim 1, wherein 20≦(d×f/PS)≦1000, where d (mm) is a clearance between the image bearing member and said developer carrying member, f (Hz) is a frequency of the oscillating bias voltage, and PS (mm/sec) is a process speed at which an image is formed on the image bearing member.
Claim 8
Dependent Claim
8 words
An apparatus according to claim 6, wherein 40≦(d×f/PS)≦500.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 1, wherein said image bearing member and said developer carrying member are out of contact with each other.
Claim 10
Dependent Claim
17 words
An apparatus according to claim 1, further comprising a plurality of developing means containing different color developers.
Claim 11
Dependent Claim
73 words
A developing apparatus comprising: a rotatable developer carrying member for supplying a developer to an image bearing member, wherein the developer is a one component developer and has a flowability index of 3-30%; and a developing bias application means for applying a developing bias to said developer carrying member; wherein said developer carrying member is supplied with a developing bias voltage by said developing bias application means, and is rotated before developing operation.
Claim 12
Dependent Claim
73 words
A developing apparatus comprising: a rotatable developer carrying member for supplying a developer to an image bearing member, wherein the developer is a one component developer and has a flowability index of 3-30%; and a developing bias application means for applying a developing bias to said developer carrying member; wherein said developer carrying member is supplied with a developing bias voltage by said developing bias application means, and is rotated before developing operation.
Claim 13
Dependent Claim
42 words
An apparatus according to claim 10, wherein said developing apparatus is used with an image forming apparatus having an image fixing device, and said developer carrying member is rotated before a developing operation, during a temperature control operation for said fixing device.
Claim 14
Dependent Claim
26 words
An apparatus according to claim 10, further comprising a timer for effecting rotation of said developer carrying member before a developing operation at predetermined time intervals.
Claim 15
Dependent Claim
54 words
An apparatus according to claim 10, wherein said developing apparatus is used with an image forming apparatus for forming an image on a recording material, and wherein a time period in which said developer carrying member is rotated before a developing operation changes depending on a number of recording operations on the recording materials.
Claim 16
Dependent Claim
43 words
An apparatus according to claim 10, further comprising a humidity sensor for detecting humidity, and where a timing and a duration of the rotation of said developer carrying member before a developing operation changes in accordance with an output of said humidity sensor.
Claim 17
Dependent Claim
79 words
An apparatus according to claim 10, wherein said developing bias application means applies an oscillating bias voltage including a first peak voltage, for an application period T1, for forming an electric field for urging the developer from said developer carrying member to said image bearing member, and a second peak voltage, for an application period T2, for forming an electric field for urging the developer from said image bearing member to said developer carrying member, wherein T1:T2 satisfies 1:2-1:10.
Claim 18
Dependent Claim
17 words
An apparatus according to claim 10, further comprising a plurality of developing means containing different color developers.
Claim 19
Dependent Claim
82 words
A developing apparatus comprising: a developer carrying member for supplying a developer to an image bearing member; a developer application member contactable to said developer carrying member to apply the developer thereto; and a developer container containing said developer application member and the developer; wherein the developer is a one component developer and has a flowability index of 3-30%; and wherein a gap between an internal wall of said developer container and an end of said developer application member is 0-2 mm.
Claim 20
Dependent Claim
82 words
A developing apparatus comprising: a developer carrying member for supplying a developer to an image bearing member; a developer application member contactable to said developer carrying member to apply the developer thereto; and a developer container containing said developer application member and the developer; wherein the developer is a one component developer and has a flowability index of 3-30%; and wherein a gap between an internal wall of said developer container and an end of said developer application member is 0-2 mm.
Claim 21
Dependent Claim
27 words
An apparatus according to claim 17, wherein a toner returning member is provided adjacent an end of said developer carrying member to prevent entry of the toner.
Claim 22
Dependent Claim
79 words
An apparatus according to claim 17, wherein said developing bias application means applies an oscillating bias voltage including a first peak voltage, for an application period T1, for forming an electric field for urging the developer from said developer carrying member to said image bearing member, and a second peak voltage, for an application period T2, for forming an electric field for urging the developer from said image bearing member to said developer carrying member, wherein T1:T2 satisfies 1:2-1:10.
Claim 23
Dependent Claim
17 words
An apparatus according to claim 17, further comprising a plurality of developing means containing different color developers.
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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) | 1997-04-25 | 1997-10-25 | 1998-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-25 | 2001-10-25 | 2002-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-25 | 2005-10-25 | 2006-04-26 | $7700.00 | Window Closed / Lapsed |