US4493882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image formation method and apparatus
Assignee: Canon Inc
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Filing: 1982-11-29
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Granted: 1985-01-15
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Expires: 2002-11-29
Abstract
Abstract An image formation method and apparatus utilizing the technique of removing a conductive one-component developer which adheres to the non-image bearing portion of an image bearing member such as a photosensitive member and provides the background fog of the image on the image bearing member. More particularly, it discloses an image formation method and apparatus in which one-component developer conductive particles are brought into contact with the developer forming the fog to thereby induce in said particles a charge of the opposite polarity to the polarity of the charge of the developer and the particles and the developer are attracted to each other by the coulomb force thereof, whereafter with the conveyance force of said particles, said developer is removed to thereby form a fogless image.
Inventors
- 👤 Shuzo Kaneko
- 👤 Yasuyuki Tamura
- 👤 Tohru Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/095
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
An image formation method comprising the steps of: developing an image bearing member with a first one component conductive developer retained by first retaining means; and rubbing the surface of the image bearing member bearing a developed image with a second one component conductive developer retained by second retaining means and maintained at a potential to remove the developer which forms a fog in the non-image area of the image bearing member.
Claim 2
Dependent Claim
72 words
An image formation method comprising the steps of: developing an image bearing member with a first one component conductive developer retained by first retaining means; and rubbing the surface of the image bearing member bearing a developed image with a second one component conductive developer retained by second retaining means and maintained at a potential to remove the developer which forms a fog in the non-image area of the image bearing member.
Claim 3
Dependent Claim
22 words
An image formation method according to claim 1, wherein said first and second retaining means are parts of a common retaining member.
Claim 4
Dependent Claim
30 words
An image formation method according to claim 1, wherein said first and second one component conductive developers are of the same composition and are retained in the same developing container.
Claim 5
Dependent Claim
34 words
An image formation method according to claim 1 or 2, wherein at least one of said one component developers is magnetic and is retained by a magnetic field generated by the associated retaining means.
Claim 6
Dependent Claim
80 words
An image formation method comprising the steps of: developing the conductive and non-conductive patterns of an image bearing member with a first one component conductive magnetic developer retained by first retaining means; and rubbing the surface of the image bearing member bearing a developed image with a second one component conductive magnetic developer retained by second retaining means and maintained at a potential for removing the developer which forms a fog of the non-image area of the image bearing member.
Claim 7
Dependent Claim
80 words
An image formation method comprising the steps of: developing the conductive and non-conductive patterns of an image bearing member with a first one component conductive magnetic developer retained by first retaining means; and rubbing the surface of the image bearing member bearing a developed image with a second one component conductive magnetic developer retained by second retaining means and maintained at a potential for removing the developer which forms a fog of the non-image area of the image bearing member.
Claim 8
Dependent Claim
22 words
An image formation method according to claim 5, wherein said first and second retaining means are parts of the same retaining member.
Claim 9
Dependent Claim
62 words
An image formation method according to claim 5, wherein said image bearing member has a transparent base, a photoconductive layer and an intermediate conductive layer, and wherein said developing step includes supplying said first developer to the photoconductive layer side while image information is applied from the base side, and applying a bias voltage between the conductive layer and the first developer.
Claim 10
Dependent Claim
28 words
An image formation method according to claim 5 or 7 wherein said first and second developers have the same composition and are provided in the same developer container.
Claim 11
Dependent Claim
73 words
An image formation method comprising the steps of: developing an image bearing member with a first magnetic one-component conductive developer retained by first retaining means; and rubbing the surface of the image bearing member bearing a developed image with a second magnetic one component conductive developer retained by second retaining means and maintained at a potential for removing the developer which forms a fog in the non-image area of the image bearing member.
Claim 12
Dependent Claim
73 words
An image formation method comprising the steps of: developing an image bearing member with a first magnetic one-component conductive developer retained by first retaining means; and rubbing the surface of the image bearing member bearing a developed image with a second magnetic one component conductive developer retained by second retaining means and maintained at a potential for removing the developer which forms a fog in the non-image area of the image bearing member.
Claim 13
Dependent Claim
22 words
An image formation method according to claim 9, wherein said first and second retaining means are parts of the same retaining member.
Claim 14
Dependent Claim
27 words
An image formation method according to claim 9, wherein said first and second developers have the same developer composition and are provided in the same developer container.
Claim 15
Dependent Claim
17 words
An image formation method according to claim 1, wherein said second one component conductive developer is grounded.
Claim 16
Dependent Claim
17 words
An image formation method according to claim 5, wherein said second one component conductive developer is grounded.
Claim 17
Dependent Claim
17 words
An image formation method according to claim 9, wherein said second one component conductive developer is grounded.
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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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |